fix: call Stop on all other signals to correctly set the server state for the shutdown procedure to complete successfully

* possibly fixes: #979

.github/FUNDING.yml

@@ -0,0 +1,4 @@
+# These are supported funding model platforms
+
+github: [hibiken]
+open_collective: ken-hibino

.github/ISSUE_TEMPLATE/bug_report.md

@@ -3,13 +3,20 @@ name: Bug report
 about: Create a report to help us improve
 title: "[BUG] Description of the bug"
 labels: bug
-assignees: hibiken
-
+assignees:
+  - hibiken
+  - kamikazechaser
+  
 ---
 
 **Describe the bug**
 A clear and concise description of what the bug is.
 
+**Environment (please complete the following information):**
+ - OS: [e.g. MacOS, Linux]
+ - `asynq` package version [e.g. v0.25.0]
+ - Redis/Valkey version 
+
 **To Reproduce**
 Steps to reproduce the behavior (Code snippets if applicable):
 1. Setup background processing ...
@@ -22,9 +29,5 @@ A clear and concise description of what you expected to happen.
 **Screenshots**
 If applicable, add screenshots to help explain your problem.
 
-**Environment (please complete the following information):**
- - OS: [e.g. MacOS, Linux]
- - Version of `asynq` package [e.g. v1.0.0]
-
 **Additional context**
 Add any other context about the problem here.

.github/ISSUE_TEMPLATE/feature_request.md

@@ -3,7 +3,9 @@ name: Feature request
 about: Suggest an idea for this project
 title: "[FEATURE REQUEST] Description of the feature request"
 labels: enhancement
-assignees: hibiken
+assignees:
+  - hibiken
+  - kamikazechaser
 
 ---
 

.github/dependabot.yaml

@@ -0,0 +1,24 @@
+version: 2
+updates:
+  - package-ecosystem: "gomod"
+    directory: "/"
+    schedule:
+      interval: "weekly"
+    labels:
+      - "pr-deps"
+  - package-ecosystem: "gomod"
+    directory: "/tools"
+    schedule:
+      interval: "weekly"
+    labels:
+      - "pr-deps"
+  - package-ecosystem: "gomod"
+    directory: "/x"
+    schedule:
+      interval: "weekly"
+    labels:
+      - "pr-deps"
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule:
+      interval: "weekly"

.github/workflows/benchstat.yml

@@ -11,20 +11,20 @@ jobs:
     runs-on: ubuntu-latest
     services:
       redis:
-        image: redis
+        image: redis:7
         ports:
           - 6379:6379
     steps:
       - name: Checkout
-        uses: actions/checkout@v2
+        uses: actions/checkout@v4
       - name: Set up Go
-        uses: actions/setup-go@v2
+        uses: actions/setup-go@v5
         with:
-          go-version: 1.16.x
+          go-version: 1.23.x
       - name: Benchmark
         run: go test -run=^$ -bench=. -count=5 -timeout=60m ./... | tee -a new.txt
       - name: Upload Benchmark
-        uses: actions/upload-artifact@v2
+        uses: actions/upload-artifact@v4
         with:
           name: bench-incoming
           path: new.txt
@@ -33,22 +33,22 @@ jobs:
     runs-on: ubuntu-latest
     services:
       redis:
-        image: redis
+        image: redis:7
         ports:
           - 6379:6379
     steps:
       - name: Checkout
-        uses: actions/checkout@v2
+        uses: actions/checkout@v4
         with:
           ref: master
       - name: Set up Go
-        uses: actions/setup-go@v2
+        uses: actions/setup-go@v5
         with:
-          go-version: 1.15.x
+          go-version: 1.23.x
       - name: Benchmark
         run: go test -run=^$ -bench=. -count=5 -timeout=60m ./... | tee -a old.txt
       - name: Upload Benchmark
-        uses: actions/upload-artifact@v2
+        uses: actions/upload-artifact@v4
         with:
           name: bench-current
           path: old.txt
@@ -58,25 +58,25 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@v2
+        uses: actions/checkout@v4
       - name: Set up Go
-        uses: actions/setup-go@v2
+        uses: actions/setup-go@v5
         with:
-          go-version: 1.15.x
+          go-version: 1.23.x
       - name: Install benchstat
         run: go get -u golang.org/x/perf/cmd/benchstat
       - name: Download Incoming
-        uses: actions/download-artifact@v2
+        uses: actions/download-artifact@v4
         with:
           name: bench-incoming
       - name: Download Current
-        uses: actions/download-artifact@v2
+        uses: actions/download-artifact@v4
         with:
           name: bench-current
       - name: Benchstat Results
         run: benchstat old.txt new.txt | tee -a benchstat.txt
       - name: Upload benchstat results
-        uses: actions/upload-artifact@v2
+        uses: actions/upload-artifact@v4
         with:
           name: benchstat
           path: benchstat.txt

.github/workflows/build.yml

@@ -7,29 +7,77 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-latest]
-        go-version: [1.13.x, 1.14.x, 1.15.x, 1.16.x]
+        go-version: [1.22.x, 1.23.x]
     runs-on: ${{ matrix.os }}
     services:
       redis:
-        image: redis
+        image: redis:7
         ports:
           - 6379:6379
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
 
       - name: Set up Go
-        uses: actions/setup-go@v2
+        uses: actions/setup-go@v5
         with:
           go-version: ${{ matrix.go-version }}
+          cache: false
 
-      - name: Build
+      - name: Build core module
         run: go build -v ./...
 
-      - name: Test
+      - name: Build x module
+        run: cd x && go build -v ./... && cd ..
+
+      - name: Test core module
         run: go test -race -v -coverprofile=coverage.txt -covermode=atomic ./...
 
+      - name: Test x module
+        run: cd x && go test -race -v ./... && cd ..
+
       - name: Benchmark Test
         run: go test -run=^$ -bench=. -loglevel=debug ./...
 
       - name: Upload coverage to Codecov
-        uses: codecov/codecov-action@v1
+        uses: codecov/codecov-action@v5
+
+  build-tool:
+    strategy:
+      matrix:
+        os: [ubuntu-latest]
+        go-version: [1.22.x, 1.23.x]
+    runs-on: ${{ matrix.os }}
+    services:
+      redis:
+        image: redis:7
+        ports:
+          - 6379:6379
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Set up Go
+        uses: actions/setup-go@v5
+        with:
+          go-version: ${{ matrix.go-version }}
+          cache: false
+
+      - name: Build tools module
+        run: cd tools && go build -v ./... && cd ..
+
+      - name: Test tools module
+        run: cd tools && go test -race -v ./... && cd ..
+
+  golangci:
+    name: lint
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: actions/setup-go@v5
+        with:
+          go-version: stable
+
+      - name: golangci-lint
+        uses: golangci/golangci-lint-action@v6
+        with:
+          version: v1.61

.gitignore

@@ -1,3 +1,4 @@
+vendor
 # Binaries for programs and plugins
 *.exe
 *.exe~
@@ -14,11 +15,13 @@
 # Ignore examples for now
 /examples
 
-# Ignore command binary
+# Ignore tool binaries
 /tools/asynq/asynq
+/tools/metrics_exporter/metrics_exporter
 
 # Ignore asynq config file
 .asynq.*
 
 # Ignore editor config files
-.vscode
+.vscode
+.idea

CHANGELOG.md

@@ -7,13 +7,153 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
-## [0.18.3] - 2020-08-09
+## [0.25.0] - 2024-10-29
+
+### Upgrades
+- Minumum go version is set to 1.22 (PR: https://github.com/hibiken/asynq/pull/925)
+- Internal protobuf package is upgraded to address security advisories (PR: https://github.com/hibiken/asynq/pull/925)
+- Most packages are upgraded
+- CI/CD spec upgraded
+
+### Added
+- `IsPanicError` function is introduced to support catching of panic errors when processing tasks (PR: https://github.com/hibiken/asynq/pull/491)
+- `JanitorInterval` and `JanitorBatchSize` are added as Server options (PR: https://github.com/hibiken/asynq/pull/715)
+- `NewClientFromRedisClient` is introduced to allow reusing an existing redis client (PR: https://github.com/hibiken/asynq/pull/742)
+- `TaskCheckInterval` config option is added to specify the interval between checks for new tasks to process when all queues are empty (PR: https://github.com/hibiken/asynq/pull/694)
+- `Ping` method is added to Client, Server and Scheduler ((PR: https://github.com/hibiken/asynq/pull/585))
+- `RevokeTask` error type is introduced to prevent a task from being retried or archived (PR: https://github.com/hibiken/asynq/pull/882)
+- `SentinelUsername` is added as a redis config option (PR: https://github.com/hibiken/asynq/pull/924)
+- Some jitter is introduced to improve latency when fetching jobs in the processor (PR: https://github.com/hibiken/asynq/pull/868)
+- Add task enqueue command to the CLI (PR: https://github.com/hibiken/asynq/pull/918)
+- Add a map cache (concurrent safe) to keep track of queues that ultimately reduces redis load when enqueuing tasks (PR: https://github.com/hibiken/asynq/pull/946)
+
+### Fixes
+- Archived tasks that are trimmed should now be deleted (PR: https://github.com/hibiken/asynq/pull/743)
+- Fix lua script when listing task messages with an expired lease (PR: https://github.com/hibiken/asynq/pull/709)
+- Fix potential context leaks due to cancellation not being called (PR: https://github.com/hibiken/asynq/pull/926)
+- Misc documentation fixes
+- Misc test fixes
+
+
+## [0.24.1] - 2023-05-01
+
+### Changed
+- Updated package version dependency for go-redis 
+
+## [0.24.0] - 2023-01-02
+
+### Added
+- `PreEnqueueFunc`, `PostEnqueueFunc` is added in `Scheduler` and deprecated `EnqueueErrorHandler` (PR: https://github.com/hibiken/asynq/pull/476)
+
+### Changed
+- Removed error log when `Scheduler` failed to enqueue a task. Use `PostEnqueueFunc` to check for errors and task actions if needed.
+- Changed log level from ERROR to WARNINING when `Scheduler` failed to record `SchedulerEnqueueEvent`.
+
+## [0.23.0] - 2022-04-11
+
+### Added
+
+- `Group` option is introduced to enqueue task in a group.
+- `GroupAggregator` and related types are introduced for task aggregation feature.
+- `GroupGracePeriod`, `GroupMaxSize`, `GroupMaxDelay`, and `GroupAggregator` fields are added to `Config`.
+- `Inspector` has new methods related to "aggregating tasks".
+- `Group` field is added to `TaskInfo`.
+- (CLI): `group ls` command is added
+- (CLI): `task ls` supports listing aggregating tasks via `--state=aggregating --group=<GROUP>` flags
+- Enable rediss url parsing support
+
+### Fixed
+
+- Fixed overflow issue with 32-bit systems (For details, see https://github.com/hibiken/asynq/pull/426)
+
+## [0.22.1] - 2022-02-20
+
+### Fixed
+
+- Fixed Redis version compatibility: Keep support for redis v4.0+
+
+## [0.22.0] - 2022-02-19
+
+### Added
+
+- `BaseContext` is introduced in `Config` to specify callback hook to provide a base `context` from which `Handler` `context` is derived
+- `IsOrphaned` field is added to `TaskInfo` to describe a task left in active state with no worker processing it.
+
+### Changed
+
+- `Server` now recovers tasks with an expired lease. Recovered tasks are retried/archived with `ErrLeaseExpired` error.
+
+## [0.21.0] - 2022-01-22
+
+### Added
+
+- `PeriodicTaskManager` is added. Prefer using this over `Scheduler` as it has better support for dynamic periodic tasks.
+- The `asynq stats` command now supports a `--json` option, making its output a JSON object
+- Introduced new configuration for `DelayedTaskCheckInterval`. See [godoc](https://godoc.org/github.com/hibiken/asynq) for more details.
+
+## [0.20.0] - 2021-12-19
+
+### Added
+
+- Package `x/metrics` is added.
+- Tool `tools/metrics_exporter` binary is added.
+- `ProcessedTotal` and `FailedTotal` fields were added to `QueueInfo` struct.
+
+## [0.19.1] - 2021-12-12
+
+### Added
+
+- `Latency` field is added to `QueueInfo`.
+- `EnqueueContext` method is added to `Client`.
+
+### Fixed
+
+- Fixed an error when user pass a duration less than 1s to `Unique` option
+
+## [0.19.0] - 2021-11-06
+
+### Changed
+
+- `NewTask` takes `Option` as variadic argument
+- Bumped minimum supported go version to 1.14 (i.e. go1.14 or higher is required).
+
+### Added
+
+- `Retention` option is added to allow user to specify task retention duration after completion.
+- `TaskID` option is added to allow user to specify task ID.
+- `ErrTaskIDConflict` sentinel error value is added.
+- `ResultWriter` type is added and provided through `Task.ResultWriter` method.
+- `TaskInfo` has new fields `CompletedAt`, `Result` and `Retention`.
+
+### Removed
+
+- `Client.SetDefaultOptions` is removed. Use `NewTask` instead to pass default options for tasks.
+
+## [0.18.6] - 2021-10-03
+
+### Changed
+
+- Updated `github.com/go-redis/redis` package to v8
+
+## [0.18.5] - 2021-09-01
+
+### Added
+
+- `IsFailure` config option is added to determine whether error returned from Handler counts as a failure.
+
+## [0.18.4] - 2021-08-17
+
+### Fixed
+
+- Scheduler methods are now thread-safe. It's now safe to call `Register` and `Unregister` concurrently.
+
+## [0.18.3] - 2021-08-09
 
 ### Changed
 
 - `Client.Enqueue` no longer enqueues tasks with empty typename; Error message is returned.
 
-## [0.18.2] - 2020-07-15
+## [0.18.2] - 2021-07-15
 
 ### Changed
 
@@ -24,7 +164,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 - Fixed latency issue around memory usage (see https://github.com/hibiken/asynq/issues/309).
 
-## [0.18.1] - 2020-07-04
+## [0.18.1] - 2021-07-04
 
 ### Changed
 
@@ -183,9 +323,9 @@ Use `ProcessIn` or `ProcessAt` option to schedule a task instead of `EnqueueIn`
 
 #### `Inspector`
 
-All Inspector methods are scoped to a queue, and the methods take `qname (string)` as the first argument.  
-`EnqueuedTask` is renamed to `PendingTask` and its corresponding methods.  
-`InProgressTask` is renamed to `ActiveTask` and its corresponding methods.  
+All Inspector methods are scoped to a queue, and the methods take `qname (string)` as the first argument.
+`EnqueuedTask` is renamed to `PendingTask` and its corresponding methods.
+`InProgressTask` is renamed to `ActiveTask` and its corresponding methods.
 Command "Enqueue" is replaced by the verb "Run" (e.g. `EnqueueAllScheduledTasks` --> `RunAllScheduledTasks`)
 
 #### `CLI`

CODE_OF_CONDUCT.md

@@ -0,0 +1,128 @@
+# Contributor Covenant Code of Conduct
+
+## Our Pledge
+
+We as members, contributors, and leaders pledge to make participation in our
+community a harassment-free experience for everyone, regardless of age, body
+size, visible or invisible disability, ethnicity, sex characteristics, gender
+identity and expression, level of experience, education, socio-economic status,
+nationality, personal appearance, race, religion, or sexual identity
+and orientation.
+
+We pledge to act and interact in ways that contribute to an open, welcoming,
+diverse, inclusive, and healthy community.
+
+## Our Standards
+
+Examples of behavior that contributes to a positive environment for our
+community include:
+
+* Demonstrating empathy and kindness toward other people
+* Being respectful of differing opinions, viewpoints, and experiences
+* Giving and gracefully accepting constructive feedback
+* Accepting responsibility and apologizing to those affected by our mistakes,
+  and learning from the experience
+* Focusing on what is best not just for us as individuals, but for the
+  overall community
+
+Examples of unacceptable behavior include:
+
+* The use of sexualized language or imagery, and sexual attention or
+  advances of any kind
+* Trolling, insulting or derogatory comments, and personal or political attacks
+* Public or private harassment
+* Publishing others' private information, such as a physical or email
+  address, without their explicit permission
+* Other conduct which could reasonably be considered inappropriate in a
+  professional setting
+
+## Enforcement Responsibilities
+
+Community leaders are responsible for clarifying and enforcing our standards of
+acceptable behavior and will take appropriate and fair corrective action in
+response to any behavior that they deem inappropriate, threatening, offensive,
+or harmful.
+
+Community leaders have the right and responsibility to remove, edit, or reject
+comments, commits, code, wiki edits, issues, and other contributions that are
+not aligned to this Code of Conduct, and will communicate reasons for moderation
+decisions when appropriate.
+
+## Scope
+
+This Code of Conduct applies within all community spaces, and also applies when
+an individual is officially representing the community in public spaces.
+Examples of representing our community include using an official e-mail address,
+posting via an official social media account, or acting as an appointed
+representative at an online or offline event.
+
+## Enforcement
+
+Instances of abusive, harassing, or otherwise unacceptable behavior may be
+reported to the community leaders responsible for enforcement at
+ken.hibino7@gmail.com.
+All complaints will be reviewed and investigated promptly and fairly.
+
+All community leaders are obligated to respect the privacy and security of the
+reporter of any incident.
+
+## Enforcement Guidelines
+
+Community leaders will follow these Community Impact Guidelines in determining
+the consequences for any action they deem in violation of this Code of Conduct:
+
+### 1. Correction
+
+**Community Impact**: Use of inappropriate language or other behavior deemed
+unprofessional or unwelcome in the community.
+
+**Consequence**: A private, written warning from community leaders, providing
+clarity around the nature of the violation and an explanation of why the
+behavior was inappropriate. A public apology may be requested.
+
+### 2. Warning
+
+**Community Impact**: A violation through a single incident or series
+of actions.
+
+**Consequence**: A warning with consequences for continued behavior. No
+interaction with the people involved, including unsolicited interaction with
+those enforcing the Code of Conduct, for a specified period of time. This
+includes avoiding interactions in community spaces as well as external channels
+like social media. Violating these terms may lead to a temporary or
+permanent ban.
+
+### 3. Temporary Ban
+
+**Community Impact**: A serious violation of community standards, including
+sustained inappropriate behavior.
+
+**Consequence**: A temporary ban from any sort of interaction or public
+communication with the community for a specified period of time. No public or
+private interaction with the people involved, including unsolicited interaction
+with those enforcing the Code of Conduct, is allowed during this period.
+Violating these terms may lead to a permanent ban.
+
+### 4. Permanent Ban
+
+**Community Impact**: Demonstrating a pattern of violation of community
+standards, including sustained inappropriate behavior,  harassment of an
+individual, or aggression toward or disparagement of classes of individuals.
+
+**Consequence**: A permanent ban from any sort of public interaction within
+the community.
+
+## Attribution
+
+This Code of Conduct is adapted from the [Contributor Covenant][homepage],
+version 2.0, available at
+https://www.contributor-covenant.org/version/2/0/code_of_conduct.html.
+
+Community Impact Guidelines were inspired by [Mozilla's code of conduct
+enforcement ladder](https://github.com/mozilla/diversity).
+
+[homepage]: https://www.contributor-covenant.org
+
+For answers to common questions about this code of conduct, see the FAQ at
+https://www.contributor-covenant.org/faq. Translations are available at
+https://www.contributor-covenant.org/translations.

CONTRIBUTING.md

@@ -38,7 +38,7 @@ Thank you! We'll try to respond as quickly as possible.
 ## Contributing Code
 
 1. Fork this repo
-2. Download your fork `git clone https://github.com/your-username/asynq && cd asynq`
+2. Download your fork `git clone git@github.com:your-username/asynq.git && cd asynq`
 3. Create your branch `git checkout -b your-branch-name`
 4. Make and commit your changes
 5. Push the branch `git push origin your-branch-name`

Makefile

@@ -4,4 +4,8 @@ proto: internal/proto/asynq.proto
 	protoc -I=$(ROOT_DIR)/internal/proto \
 				 --go_out=$(ROOT_DIR)/internal/proto \
 				 --go_opt=module=github.com/hibiken/asynq/internal/proto \
-				 $(ROOT_DIR)/internal/proto/asynq.proto
+				 $(ROOT_DIR)/internal/proto/asynq.proto
+
+.PHONY: lint
+lint:
+	golangci-lint run

README.md

@@ -33,23 +33,30 @@ Task queues are used as a mechanism to distribute work across multiple machines.
 - Low latency to add a task since writes are fast in Redis
 - De-duplication of tasks using [unique option](https://github.com/hibiken/asynq/wiki/Unique-Tasks)
 - Allow [timeout and deadline per task](https://github.com/hibiken/asynq/wiki/Task-Timeout-and-Cancelation)
+- Allow [aggregating group of tasks](https://github.com/hibiken/asynq/wiki/Task-aggregation) to batch multiple successive operations
 - [Flexible handler interface with support for middlewares](https://github.com/hibiken/asynq/wiki/Handler-Deep-Dive)
 - [Ability to pause queue](/tools/asynq/README.md#pause) to stop processing tasks from the queue
 - [Periodic Tasks](https://github.com/hibiken/asynq/wiki/Periodic-Tasks)
-- [Support Redis Cluster](https://github.com/hibiken/asynq/wiki/Redis-Cluster) for automatic sharding and high availability
 - [Support Redis Sentinels](https://github.com/hibiken/asynq/wiki/Automatic-Failover) for high availability
+- Integration with [Prometheus](https://prometheus.io/) to collect and visualize queue metrics
 - [Web UI](#web-ui) to inspect and remote-control queues and tasks
 - [CLI](#command-line-tool) to inspect and remote-control queues and tasks
 
 ## Stability and Compatibility
 
-**Status**: The library is currently undergoing **heavy development** with frequent, breaking API changes.
+**Status**: The library relatively stable and is currently undergoing **moderate development** with less frequent breaking API changes.
 
-> ☝️ **Important Note**: Current major version is zero (`v0.x.x`) to accomodate rapid development and fast iteration while getting early feedback from users (_feedback on APIs are appreciated!_). The public API could change without a major version update before `v1.0.0` release.
+> ☝️ **Important Note**: Current major version is zero (`v0.x.x`) to accommodate rapid development and fast iteration while getting early feedback from users (_feedback on APIs are appreciated!_). The public API could change without a major version update before `v1.0.0` release.
+
+### Redis Cluster Compatibility
+
+Some of the lua scripts in this library may not be compatible with Redis Cluster.
+
+## Sponsoring
+If you are using this package in production, **please consider sponsoring the project to show your support!**
 
 ## Quickstart
-
-Make sure you have Go installed ([download](https://golang.org/dl/)). Version `1.13` or higher is required.
+Make sure you have Go installed ([download](https://golang.org/dl/)). The **last two** Go versions are supported (See https://go.dev/dl).
 
 Initialize your project by creating a folder and then running `go mod init github.com/your/repo` ([learn more](https://blog.golang.org/using-go-modules)) inside the folder. Then install Asynq library with the [`go get`](https://golang.org/cmd/go/#hdr-Add_dependencies_to_current_module_and_install_them) command:
 
@@ -65,8 +72,11 @@ Next, write a package that encapsulates task creation and task handling.
 package tasks
 
 import (
+    "context"
+    "encoding/json"
     "fmt"
-
+    "log"
+    "time"
     "github.com/hibiken/asynq"
 )
 
@@ -103,7 +113,8 @@ func NewImageResizeTask(src string) (*asynq.Task, error) {
     if err != nil {
         return nil, err
     }
-    return asynq.NewTask(TypeImageResize, payload), nil
+    // task options can be passed to NewTask, which can be overridden at enqueue time.
+    return asynq.NewTask(TypeImageResize, payload, asynq.MaxRetry(5), asynq.Timeout(20 * time.Minute)), nil
 }
 
 //---------------------------------------------------------------
@@ -196,28 +207,15 @@ func main() {
     //            Options include MaxRetry, Queue, Timeout, Deadline, Unique etc.
     // ----------------------------------------------------------------------------
 
-    client.SetDefaultOptions(tasks.TypeImageResize, asynq.MaxRetry(10), asynq.Timeout(3*time.Minute))
-
     task, err = tasks.NewImageResizeTask("https://example.com/myassets/image.jpg")
     if err != nil {
         log.Fatalf("could not create task: %v", err)
     }
-    info, err = client.Enqueue(task)
+    info, err = client.Enqueue(task, asynq.MaxRetry(10), asynq.Timeout(3 * time.Minute))
     if err != nil {
         log.Fatalf("could not enqueue task: %v", err)
     }
     log.Printf("enqueued task: id=%s queue=%s", info.ID, info.Queue)
-
-    // ---------------------------------------------------------------------------
-    // Example 4: Pass options to tune task processing behavior at enqueue time.
-    //            Options passed at enqueue time override default ones.
-    // ---------------------------------------------------------------------------
-
-    info, err = client.Enqueue(task, asynq.Queue("critical"), asynq.Timeout(30*time.Second))
-    if err != nil {
-        log.Fatal("could not enqueue task: %v", err)
-    }
-    log.Printf("enqueued task: id=%s queue=%s", info.ID, info.Queue)
 }
 ```
 
@@ -239,7 +237,7 @@ const redisAddr = "127.0.0.1:6379"
 
 func main() {
     srv := asynq.NewServer(
-        asynq.RedisClientOpt{Addr: redisAddr}
+        asynq.RedisClientOpt{Addr: redisAddr},
         asynq.Config{
             // Specify how many concurrent workers to use
             Concurrency: 10,
@@ -283,6 +281,9 @@ Here's a few screenshots of the Web UI:
 
 ![Web UI TasksView](https://user-images.githubusercontent.com/11155743/114697070-1f0a0300-9d26-11eb-855c-d3ec263865b7.png)
 
+**Metrics view**
+<img width="1532" alt="Screen Shot 2021-12-19 at 4 37 19 PM" src="https://user-images.githubusercontent.com/10953044/146777420-cae6c476-bac6-469c-acce-b2f6584e8707.png">
+
 **Settings and adaptive dark mode**
 
 ![Web UI Settings and adaptive dark mode](https://user-images.githubusercontent.com/11155743/114697149-3517c380-9d26-11eb-9f7a-ae2dd00aad5b.png)
@@ -296,12 +297,12 @@ Asynq ships with a command line tool to inspect the state of queues and tasks.
 To install the CLI tool, run the following command:
 
 ```sh
-go get -u github.com/hibiken/asynq/tools/asynq
+go install github.com/hibiken/asynq/tools/asynq@latest
 ```
 
-Here's an example of running the `asynq stats` command:
+Here's an example of running the `asynq dash` command:
 
-![Gif](/docs/assets/demo.gif)
+![Gif](/docs/assets/dash.gif)
 
 For details on how to use the tool, refer to the tool's [README](/tools/asynq/README.md).
 

aggregator.go

@@ -0,0 +1,176 @@
+// Copyright 2022 Kentaro Hibino. All rights reserved.
+// Use of this source code is governed by a MIT license
+// that can be found in the LICENSE file.
+
+package asynq
+
+import (
+	"context"
+	"sync"
+	"time"
+
+	"github.com/hibiken/asynq/internal/base"
+	"github.com/hibiken/asynq/internal/log"
+)
+
+// An aggregator is responsible for checking groups and aggregate into one task
+// if any of the grouping condition is met.
+type aggregator struct {
+	logger *log.Logger
+	broker base.Broker
+	client *Client
+
+	// channel to communicate back to the long running "aggregator" goroutine.
+	done chan struct{}
+
+	// list of queue names to check and aggregate.
+	queues []string
+
+	// Group configurations
+	gracePeriod time.Duration
+	maxDelay    time.Duration
+	maxSize     int
+
+	// User provided group aggregator.
+	ga GroupAggregator
+
+	// interval used to check for aggregation
+	interval time.Duration
+
+	// sema is a counting semaphore to ensure the number of active aggregating function
+	// does not exceed the limit.
+	sema chan struct{}
+}
+
+type aggregatorParams struct {
+	logger          *log.Logger
+	broker          base.Broker
+	queues          []string
+	gracePeriod     time.Duration
+	maxDelay        time.Duration
+	maxSize         int
+	groupAggregator GroupAggregator
+}
+
+const (
+	// Maximum number of aggregation checks in flight concurrently.
+	maxConcurrentAggregationChecks = 3
+
+	// Default interval used for aggregation checks. If the provided gracePeriod is less than
+	// the default, use the gracePeriod.
+	defaultAggregationCheckInterval = 7 * time.Second
+)
+
+func newAggregator(params aggregatorParams) *aggregator {
+	interval := defaultAggregationCheckInterval
+	if params.gracePeriod < interval {
+		interval = params.gracePeriod
+	}
+	return &aggregator{
+		logger:      params.logger,
+		broker:      params.broker,
+		client:      &Client{broker: params.broker},
+		done:        make(chan struct{}),
+		queues:      params.queues,
+		gracePeriod: params.gracePeriod,
+		maxDelay:    params.maxDelay,
+		maxSize:     params.maxSize,
+		ga:          params.groupAggregator,
+		sema:        make(chan struct{}, maxConcurrentAggregationChecks),
+		interval:    interval,
+	}
+}
+
+func (a *aggregator) shutdown() {
+	if a.ga == nil {
+		return
+	}
+	a.logger.Debug("Aggregator shutting down...")
+	// Signal the aggregator goroutine to stop.
+	a.done <- struct{}{}
+}
+
+func (a *aggregator) start(wg *sync.WaitGroup) {
+	if a.ga == nil {
+		return
+	}
+	wg.Add(1)
+	go func() {
+		defer wg.Done()
+		ticker := time.NewTicker(a.interval)
+		for {
+			select {
+			case <-a.done:
+				a.logger.Debug("Waiting for all aggregation checks to finish...")
+				// block until all aggregation checks released the token
+				for i := 0; i < cap(a.sema); i++ {
+					a.sema <- struct{}{}
+				}
+				a.logger.Debug("Aggregator done")
+				ticker.Stop()
+				return
+			case t := <-ticker.C:
+				a.exec(t)
+			}
+		}
+	}()
+}
+
+func (a *aggregator) exec(t time.Time) {
+	select {
+	case a.sema <- struct{}{}: // acquire token
+		go a.aggregate(t)
+	default:
+		// If the semaphore blocks, then we are currently running max number of
+		// aggregation checks. Skip this round and log warning.
+		a.logger.Warnf("Max number of aggregation checks in flight. Skipping")
+	}
+}
+
+func (a *aggregator) aggregate(t time.Time) {
+	defer func() { <-a.sema /* release token */ }()
+	for _, qname := range a.queues {
+		groups, err := a.broker.ListGroups(qname)
+		if err != nil {
+			a.logger.Errorf("Failed to list groups in queue: %q", qname)
+			continue
+		}
+		for _, gname := range groups {
+			aggregationSetID, err := a.broker.AggregationCheck(
+				qname, gname, t, a.gracePeriod, a.maxDelay, a.maxSize)
+			if err != nil {
+				a.logger.Errorf("Failed to run aggregation check: queue=%q group=%q", qname, gname)
+				continue
+			}
+			if aggregationSetID == "" {
+				a.logger.Debugf("No aggregation needed at this time: queue=%q group=%q", qname, gname)
+				continue
+			}
+
+			// Aggregate and enqueue.
+			msgs, deadline, err := a.broker.ReadAggregationSet(qname, gname, aggregationSetID)
+			if err != nil {
+				a.logger.Errorf("Failed to read aggregation set: queue=%q, group=%q, setID=%q",
+					qname, gname, aggregationSetID)
+				continue
+			}
+			tasks := make([]*Task, len(msgs))
+			for i, m := range msgs {
+				tasks[i] = NewTask(m.Type, m.Payload)
+			}
+			aggregatedTask := a.ga.Aggregate(gname, tasks)
+			ctx, cancel := context.WithDeadline(context.Background(), deadline)
+			if _, err := a.client.EnqueueContext(ctx, aggregatedTask, Queue(qname)); err != nil {
+				a.logger.Errorf("Failed to enqueue aggregated task (queue=%q, group=%q, setID=%q): %v",
+					qname, gname, aggregationSetID, err)
+				cancel()
+				continue
+			}
+			if err := a.broker.DeleteAggregationSet(ctx, qname, gname, aggregationSetID); err != nil {
+				a.logger.Warnf("Failed to delete aggregation set: queue=%q, group=%q, setID=%q",
+					qname, gname, aggregationSetID)
+			}
+			cancel()
+		}
+	}
+}

aggregator_test.go

@@ -0,0 +1,165 @@
+// Copyright 2022 Kentaro Hibino. All rights reserved.
+// Use of this source code is governed by a MIT license
+// that can be found in the LICENSE file.
+
+package asynq
+
+import (
+	"sync"
+	"testing"
+	"time"
+
+	"github.com/google/go-cmp/cmp"
+	"github.com/hibiken/asynq/internal/base"
+	"github.com/hibiken/asynq/internal/rdb"
+	h "github.com/hibiken/asynq/internal/testutil"
+)
+
+func TestAggregator(t *testing.T) {
+	r := setup(t)
+	defer r.Close()
+	rdbClient := rdb.NewRDB(r)
+	client := Client{broker: rdbClient}
+
+	tests := []struct {
+		desc             string
+		gracePeriod      time.Duration
+		maxDelay         time.Duration
+		maxSize          int
+		aggregateFunc    func(gname string, tasks []*Task) *Task
+		tasks            []*Task       // tasks to enqueue
+		enqueueFrequency time.Duration // time between one enqueue event to another
+		waitTime         time.Duration // time to wait
+		wantGroups       map[string]map[string][]base.Z
+		wantPending      map[string][]*base.TaskMessage
+	}{
+		{
+			desc:        "group older than the grace period should be aggregated",
+			gracePeriod: 1 * time.Second,
+			maxDelay:    0, // no maxdelay limit
+			maxSize:     0, // no maxsize limit
+			aggregateFunc: func(gname string, tasks []*Task) *Task {
+				return NewTask(gname, nil, MaxRetry(len(tasks))) // use max retry to see how many tasks were aggregated
+			},
+			tasks: []*Task{
+				NewTask("task1", nil, Group("mygroup")),
+				NewTask("task2", nil, Group("mygroup")),
+				NewTask("task3", nil, Group("mygroup")),
+			},
+			enqueueFrequency: 300 * time.Millisecond,
+			waitTime:         3 * time.Second,
+			wantGroups: map[string]map[string][]base.Z{
+				"default": {
+					"mygroup": {},
+				},
+			},
+			wantPending: map[string][]*base.TaskMessage{
+				"default": {
+					h.NewTaskMessageBuilder().SetType("mygroup").SetRetry(3).Build(),
+				},
+			},
+		},
+		{
+			desc:        "group older than the max-delay should be aggregated",
+			gracePeriod: 2 * time.Second,
+			maxDelay:    4 * time.Second,
+			maxSize:     0, // no maxsize limit
+			aggregateFunc: func(gname string, tasks []*Task) *Task {
+				return NewTask(gname, nil, MaxRetry(len(tasks))) // use max retry to see how many tasks were aggregated
+			},
+			tasks: []*Task{
+				NewTask("task1", nil, Group("mygroup")), // time 0
+				NewTask("task2", nil, Group("mygroup")), // time 1s
+				NewTask("task3", nil, Group("mygroup")), // time 2s
+				NewTask("task4", nil, Group("mygroup")), // time 3s
+			},
+			enqueueFrequency: 1 * time.Second,
+			waitTime:         4 * time.Second,
+			wantGroups: map[string]map[string][]base.Z{
+				"default": {
+					"mygroup": {},
+				},
+			},
+			wantPending: map[string][]*base.TaskMessage{
+				"default": {
+					h.NewTaskMessageBuilder().SetType("mygroup").SetRetry(4).Build(),
+				},
+			},
+		},
+		{
+			desc:        "group reached the max-size should be aggregated",
+			gracePeriod: 1 * time.Minute,
+			maxDelay:    0, // no maxdelay limit
+			maxSize:     5,
+			aggregateFunc: func(gname string, tasks []*Task) *Task {
+				return NewTask(gname, nil, MaxRetry(len(tasks))) // use max retry to see how many tasks were aggregated
+			},
+			tasks: []*Task{
+				NewTask("task1", nil, Group("mygroup")),
+				NewTask("task2", nil, Group("mygroup")),
+				NewTask("task3", nil, Group("mygroup")),
+				NewTask("task4", nil, Group("mygroup")),
+				NewTask("task5", nil, Group("mygroup")),
+			},
+			enqueueFrequency: 300 * time.Millisecond,
+			waitTime:         defaultAggregationCheckInterval * 2,
+			wantGroups: map[string]map[string][]base.Z{
+				"default": {
+					"mygroup": {},
+				},
+			},
+			wantPending: map[string][]*base.TaskMessage{
+				"default": {
+					h.NewTaskMessageBuilder().SetType("mygroup").SetRetry(5).Build(),
+				},
+			},
+		},
+	}
+
+	for _, tc := range tests {
+		h.FlushDB(t, r)
+
+		aggregator := newAggregator(aggregatorParams{
+			logger:          testLogger,
+			broker:          rdbClient,
+			queues:          []string{"default"},
+			gracePeriod:     tc.gracePeriod,
+			maxDelay:        tc.maxDelay,
+			maxSize:         tc.maxSize,
+			groupAggregator: GroupAggregatorFunc(tc.aggregateFunc),
+		})
+
+		var wg sync.WaitGroup
+		aggregator.start(&wg)
+
+		for _, task := range tc.tasks {
+			if _, err := client.Enqueue(task); err != nil {
+				t.Errorf("%s: Client Enqueue failed: %v", tc.desc, err)
+				aggregator.shutdown()
+				wg.Wait()
+				continue
+			}
+			time.Sleep(tc.enqueueFrequency)
+		}
+
+		time.Sleep(tc.waitTime)
+
+		for qname, groups := range tc.wantGroups {
+			for gname, want := range groups {
+				gotGroup := h.GetGroupEntries(t, r, qname, gname)
+				if diff := cmp.Diff(want, gotGroup, h.SortZSetEntryOpt); diff != "" {
+					t.Errorf("%s: mismatch found in %q; (-want,+got)\n%s", tc.desc, base.GroupKey(qname, gname), diff)
+				}
+			}
+		}
+
+		for qname, want := range tc.wantPending {
+			gotPending := h.GetPendingMessages(t, r, qname)
+			if diff := cmp.Diff(want, gotPending, h.SortMsgOpt, h.IgnoreIDOpt); diff != "" {
+				t.Errorf("%s: mismatch found in %q; (-want,+got)\n%s", tc.desc, base.PendingKey(qname), diff)
+			}
+		}
+		aggregator.shutdown()
+		wg.Wait()
+	}
+}

asynq.go

@@ -5,14 +5,16 @@
 package asynq
 
 import (
+	"context"
 	"crypto/tls"
 	"fmt"
+	"net"
 	"net/url"
 	"strconv"
 	"strings"
 	"time"
 
-	"github.com/go-redis/redis/v7"
+	"github.com/redis/go-redis/v9"
 	"github.com/hibiken/asynq/internal/base"
 )
 
@@ -23,16 +25,39 @@ type Task struct {
 
 	// payload holds data needed to perform the task.
 	payload []byte
+
+	// opts holds options for the task.
+	opts []Option
+
+	// w is the ResultWriter for the task.
+	w *ResultWriter
 }
 
 func (t *Task) Type() string    { return t.typename }
 func (t *Task) Payload() []byte { return t.payload }
 
+// ResultWriter returns a pointer to the ResultWriter associated with the task.
+//
+// Nil pointer is returned if called on a newly created task (i.e. task created by calling NewTask).
+// Only the tasks passed to Handler.ProcessTask have a valid ResultWriter pointer.
+func (t *Task) ResultWriter() *ResultWriter { return t.w }
+
 // NewTask returns a new Task given a type name and payload data.
-func NewTask(typename string, payload []byte) *Task {
+// Options can be passed to configure task processing behavior.
+func NewTask(typename string, payload []byte, opts ...Option) *Task {
 	return &Task{
 		typename: typename,
 		payload:  payload,
+		opts:     opts,
+	}
+}
+
+// newTask creates a task with the given typename, payload and ResultWriter.
+func newTask(typename string, payload []byte, w *ResultWriter) *Task {
+	return &Task{
+		typename: typename,
+		payload:  payload,
+		w:        w,
 	}
 }
 
@@ -73,33 +98,64 @@ type TaskInfo struct {
 	// Deadline is the deadline for the task, zero value if not specified.
 	Deadline time.Time
 
+	// Group is the name of the group in which the task belongs.
+	//
+	// Tasks in the same queue can be grouped together by Group name and will be aggregated into one task
+	// by a Server processing the queue.
+	//
+	// Empty string (default) indicates task does not belong to any groups, and no aggregation will be applied to the task.
+	Group string
+
 	// NextProcessAt is the time the task is scheduled to be processed,
 	// zero if not applicable.
 	NextProcessAt time.Time
+
+	// IsOrphaned describes whether the task is left in active state with no worker processing it.
+	// An orphaned task indicates that the worker has crashed or experienced network failures and was not able to
+	// extend its lease on the task.
+	//
+	// This task will be recovered by running a server against the queue the task is in.
+	// This field is only applicable to tasks with TaskStateActive.
+	IsOrphaned bool
+
+	// Retention is duration of the retention period after the task is successfully processed.
+	Retention time.Duration
+
+	// CompletedAt is the time when the task is processed successfully.
+	// Zero value (i.e. time.Time{}) indicates no value.
+	CompletedAt time.Time
+
+	// Result holds the result data associated with the task.
+	// Use ResultWriter to write result data from the Handler.
+	Result []byte
 }
 
-func newTaskInfo(msg *base.TaskMessage, state base.TaskState, nextProcessAt time.Time) *TaskInfo {
+// If t is non-zero, returns time converted from t as unix time in seconds.
+// If t is zero, returns zero value of time.Time.
+func fromUnixTimeOrZero(t int64) time.Time {
+	if t == 0 {
+		return time.Time{}
+	}
+	return time.Unix(t, 0)
+}
+
+func newTaskInfo(msg *base.TaskMessage, state base.TaskState, nextProcessAt time.Time, result []byte) *TaskInfo {
 	info := TaskInfo{
-		ID:            msg.ID.String(),
+		ID:            msg.ID,
 		Queue:         msg.Queue,
 		Type:          msg.Type,
 		Payload:       msg.Payload, // Do we need to make a copy?
 		MaxRetry:      msg.Retry,
 		Retried:       msg.Retried,
 		LastErr:       msg.ErrorMsg,
+		Group:         msg.GroupKey,
 		Timeout:       time.Duration(msg.Timeout) * time.Second,
+		Deadline:      fromUnixTimeOrZero(msg.Deadline),
+		Retention:     time.Duration(msg.Retention) * time.Second,
 		NextProcessAt: nextProcessAt,
-	}
-	if msg.LastFailedAt == 0 {
-		info.LastFailedAt = time.Time{}
-	} else {
-		info.LastFailedAt = time.Unix(msg.LastFailedAt, 0)
-	}
-
-	if msg.Deadline == 0 {
-		info.Deadline = time.Time{}
-	} else {
-		info.Deadline = time.Unix(msg.Deadline, 0)
+		LastFailedAt:  fromUnixTimeOrZero(msg.LastFailedAt),
+		CompletedAt:   fromUnixTimeOrZero(msg.CompletedAt),
+		Result:        result,
 	}
 
 	switch state {
@@ -113,6 +169,10 @@ func newTaskInfo(msg *base.TaskMessage, state base.TaskState, nextProcessAt time
 		info.State = TaskStateRetry
 	case base.TaskStateArchived:
 		info.State = TaskStateArchived
+	case base.TaskStateCompleted:
+		info.State = TaskStateCompleted
+	case base.TaskStateAggregating:
+		info.State = TaskStateAggregating
 	default:
 		panic(fmt.Sprintf("internal error: unknown state: %d", state))
 	}
@@ -137,6 +197,12 @@ const (
 
 	// Indicates that the task is archived and stored for inspection purposes.
 	TaskStateArchived
+
+	// Indicates that the task is processed successfully and retained until the retention TTL expires.
+	TaskStateCompleted
+
+	// Indicates that the task is waiting in a group to be aggregated into one task.
+	TaskStateAggregating
 )
 
 func (s TaskState) String() string {
@@ -151,6 +217,10 @@ func (s TaskState) String() string {
 		return "retry"
 	case TaskStateArchived:
 		return "archived"
+	case TaskStateCompleted:
+		return "completed"
+	case TaskStateAggregating:
+		return "aggregating"
 	}
 	panic("asynq: unknown task state")
 }
@@ -246,6 +316,9 @@ type RedisFailoverClientOpt struct {
 	// https://redis.io/topics/sentinel.
 	SentinelAddrs []string
 
+	// Redis sentinel username.
+	SentinelUsername string
+
 	// Redis sentinel password.
 	SentinelPassword string
 
@@ -294,6 +367,7 @@ func (opt RedisFailoverClientOpt) MakeRedisClient() interface{} {
 	return redis.NewFailoverClient(&redis.FailoverOptions{
 		MasterName:       opt.MasterName,
 		SentinelAddrs:    opt.SentinelAddrs,
+		SentinelUsername: opt.SentinelUsername,
 		SentinelPassword: opt.SentinelPassword,
 		Username:         opt.Username,
 		Password:         opt.Password,
@@ -366,9 +440,10 @@ func (opt RedisClusterClientOpt) MakeRedisClient() interface{} {
 // ParseRedisURI parses redis uri string and returns RedisConnOpt if uri is valid.
 // It returns a non-nil error if uri cannot be parsed.
 //
-// Three URI schemes are supported, which are redis:, redis-socket:, and redis-sentinel:.
+// Three URI schemes are supported, which are redis:, rediss:, redis-socket:, and redis-sentinel:.
 // Supported formats are:
 //     redis://[:password@]host[:port][/dbnumber]
+//     rediss://[:password@]host[:port][/dbnumber]
 //     redis-socket://[:password@]path[?db=dbnumber]
 //     redis-sentinel://[:password@]host1[:port][,host2:[:port]][,hostN:[:port]][?master=masterName]
 func ParseRedisURI(uri string) (RedisConnOpt, error) {
@@ -377,7 +452,7 @@ func ParseRedisURI(uri string) (RedisConnOpt, error) {
 		return nil, fmt.Errorf("asynq: could not parse redis uri: %v", err)
 	}
 	switch u.Scheme {
-	case "redis":
+	case "redis", "rediss":
 		return parseRedisURI(u)
 	case "redis-socket":
 		return parseRedisSocketURI(u)
@@ -391,6 +466,8 @@ func ParseRedisURI(uri string) (RedisConnOpt, error) {
 func parseRedisURI(u *url.URL) (RedisConnOpt, error) {
 	var db int
 	var err error
+	var redisConnOpt RedisClientOpt
+
 	if len(u.Path) > 0 {
 		xs := strings.Split(strings.Trim(u.Path, "/"), "/")
 		db, err = strconv.Atoi(xs[0])
@@ -402,7 +479,20 @@ func parseRedisURI(u *url.URL) (RedisConnOpt, error) {
 	if v, ok := u.User.Password(); ok {
 		password = v
 	}
-	return RedisClientOpt{Addr: u.Host, DB: db, Password: password}, nil
+
+	if u.Scheme == "rediss" {
+		h, _, err := net.SplitHostPort(u.Host)
+		if err != nil {
+			h = u.Host
+		}
+		redisConnOpt.TLSConfig = &tls.Config{ServerName: h}
+	}
+
+	redisConnOpt.Addr = u.Host
+	redisConnOpt.Password = password
+	redisConnOpt.DB = db
+
+	return redisConnOpt, nil
 }
 
 func parseRedisSocketURI(u *url.URL) (RedisConnOpt, error) {
@@ -433,5 +523,29 @@ func parseRedisSentinelURI(u *url.URL) (RedisConnOpt, error) {
 	if v, ok := u.User.Password(); ok {
 		password = v
 	}
-	return RedisFailoverClientOpt{MasterName: master, SentinelAddrs: addrs, Password: password}, nil
+	return RedisFailoverClientOpt{MasterName: master, SentinelAddrs: addrs, SentinelPassword: password}, nil
+}
+
+// ResultWriter is a client interface to write result data for a task.
+// It writes the data to the redis instance the server is connected to.
+type ResultWriter struct {
+	id     string // task ID this writer is responsible for
+	qname  string // queue name the task belongs to
+	broker base.Broker
+	ctx    context.Context // context associated with the task
+}
+
+// Write writes the given data as a result of the task the ResultWriter is associated with.
+func (w *ResultWriter) Write(data []byte) (n int, err error) {
+	select {
+	case <-w.ctx.Done():
+		return 0, fmt.Errorf("failed to result task result: %v", w.ctx.Err())
+	default:
+	}
+	return w.broker.WriteResult(w.qname, w.id, data)
+}
+
+// TaskID returns the ID of the task the ResultWriter is associated with.
+func (w *ResultWriter) TaskID() string {
+	return w.id
 }

asynq_test.go

@@ -5,15 +5,17 @@
 package asynq
 
 import (
+	"crypto/tls"
 	"flag"
 	"sort"
 	"strings"
 	"testing"
 
-	"github.com/go-redis/redis/v7"
+	"github.com/redis/go-redis/v9"
 	"github.com/google/go-cmp/cmp"
-	h "github.com/hibiken/asynq/internal/asynqtest"
+	"github.com/google/go-cmp/cmp/cmpopts"
 	"github.com/hibiken/asynq/internal/log"
+	h "github.com/hibiken/asynq/internal/testutil"
 )
 
 //============================================================================
@@ -99,6 +101,10 @@ func TestParseRedisURI(t *testing.T) {
 			"redis://localhost:6379",
 			RedisClientOpt{Addr: "localhost:6379"},
 		},
+		{
+			"rediss://localhost:6379",
+			RedisClientOpt{Addr: "localhost:6379", TLSConfig: &tls.Config{ServerName: "localhost"}},
+		},
 		{
 			"redis://localhost:6379/3",
 			RedisClientOpt{Addr: "localhost:6379", DB: 3},
@@ -137,9 +143,9 @@ func TestParseRedisURI(t *testing.T) {
 		{
 			"redis-sentinel://:mypassword@localhost:5000,localhost:5001,localhost:5002?master=mymaster",
 			RedisFailoverClientOpt{
-				MasterName:    "mymaster",
-				SentinelAddrs: []string{"localhost:5000", "localhost:5001", "localhost:5002"},
-				Password:      "mypassword",
+				MasterName:       "mymaster",
+				SentinelAddrs:    []string{"localhost:5000", "localhost:5001", "localhost:5002"},
+				SentinelPassword: "mypassword",
 			},
 		},
 	}
@@ -151,7 +157,7 @@ func TestParseRedisURI(t *testing.T) {
 			continue
 		}
 
-		if diff := cmp.Diff(tc.want, got); diff != "" {
+		if diff := cmp.Diff(tc.want, got, cmpopts.IgnoreUnexported(tls.Config{})); diff != "" {
 			t.Errorf("ParseRedisURI(%q) = %+v, want %+v\n(-want,+got)\n%s", tc.uri, got, tc.want, diff)
 		}
 	}

benchmark_test.go

@@ -12,7 +12,7 @@ import (
 	"testing"
 	"time"
 
-	h "github.com/hibiken/asynq/internal/asynqtest"
+	h "github.com/hibiken/asynq/internal/testutil"
 )
 
 // Creates a new task of type "task<n>" with payload {"data": n}.
@@ -55,7 +55,7 @@ func BenchmarkEndToEndSimple(b *testing.B) {
 		}
 		b.StartTimer() // end setup
 
-		srv.Start(HandlerFunc(handler))
+		_ = srv.Start(HandlerFunc(handler))
 		wg.Wait()
 
 		b.StopTimer() // begin teardown
@@ -117,7 +117,7 @@ func BenchmarkEndToEnd(b *testing.B) {
 		}
 		b.StartTimer() // end setup
 
-		srv.Start(HandlerFunc(handler))
+		_ = srv.Start(HandlerFunc(handler))
 		wg.Wait()
 
 		b.StopTimer() // begin teardown
@@ -174,7 +174,7 @@ func BenchmarkEndToEndMultipleQueues(b *testing.B) {
 		}
 		b.StartTimer() // end setup
 
-		srv.Start(HandlerFunc(handler))
+		_ = srv.Start(HandlerFunc(handler))
 		wg.Wait()
 
 		b.StopTimer() // begin teardown
@@ -215,7 +215,7 @@ func BenchmarkClientWhileServerRunning(b *testing.B) {
 		handler := func(ctx context.Context, t *Task) error {
 			return nil
 		}
-		srv.Start(HandlerFunc(handler))
+		_ = srv.Start(HandlerFunc(handler))
 
 		b.StartTimer() // end setup
 

client.go

@@ -5,16 +5,16 @@
 package asynq
 
 import (
+	"context"
 	"fmt"
 	"strings"
-	"sync"
 	"time"
 
-	"github.com/go-redis/redis/v7"
 	"github.com/google/uuid"
 	"github.com/hibiken/asynq/internal/base"
 	"github.com/hibiken/asynq/internal/errors"
 	"github.com/hibiken/asynq/internal/rdb"
+	"github.com/redis/go-redis/v9"
 )
 
 // A Client is responsible for scheduling tasks.
@@ -24,22 +24,27 @@ import (
 //
 // Clients are safe for concurrent use by multiple goroutines.
 type Client struct {
-	mu   sync.Mutex
-	opts map[string][]Option
-	rdb  *rdb.RDB
+	broker base.Broker
+	// When a Client has been created with an existing Redis connection, we do
+	// not want to close it.
+	sharedConnection bool
 }
 
 // NewClient returns a new Client instance given a redis connection option.
 func NewClient(r RedisConnOpt) *Client {
-	c, ok := r.MakeRedisClient().(redis.UniversalClient)
+	redisClient, ok := r.MakeRedisClient().(redis.UniversalClient)
 	if !ok {
 		panic(fmt.Sprintf("asynq: unsupported RedisConnOpt type %T", r))
 	}
-	rdb := rdb.NewRDB(c)
-	return &Client{
-		opts: make(map[string][]Option),
-		rdb:  rdb,
-	}
+	client := NewClientFromRedisClient(redisClient)
+	client.sharedConnection = false
+	return client
+}
+
+// NewClientFromRedisClient returns a new instance of Client given a redis.UniversalClient
+// Warning: The underlying redis connection pool will not be closed by Asynq, you are responsible for closing it.
+func NewClientFromRedisClient(c redis.UniversalClient) *Client {
+	return &Client{broker: rdb.NewRDB(c), sharedConnection: true}
 }
 
 type OptionType int
@@ -52,6 +57,9 @@ const (
 	UniqueOpt
 	ProcessAtOpt
 	ProcessInOpt
+	TaskIDOpt
+	RetentionOpt
+	GroupOpt
 )
 
 // Option specifies the task processing behavior.
@@ -70,11 +78,14 @@ type Option interface {
 type (
 	retryOption     int
 	queueOption     string
+	taskIDOption    string
 	timeoutOption   time.Duration
 	deadlineOption  time.Time
 	uniqueOption    time.Duration
 	processAtOption time.Time
 	processInOption time.Duration
+	retentionOption time.Duration
+	groupOption     string
 )
 
 // MaxRetry returns an option to specify the max number of times
@@ -93,13 +104,22 @@ func (n retryOption) Type() OptionType   { return MaxRetryOpt }
 func (n retryOption) Value() interface{} { return int(n) }
 
 // Queue returns an option to specify the queue to enqueue the task into.
-func Queue(qname string) Option {
-	return queueOption(qname)
+func Queue(name string) Option {
+	return queueOption(name)
 }
 
-func (qname queueOption) String() string     { return fmt.Sprintf("Queue(%q)", string(qname)) }
-func (qname queueOption) Type() OptionType   { return QueueOpt }
-func (qname queueOption) Value() interface{} { return string(qname) }
+func (name queueOption) String() string     { return fmt.Sprintf("Queue(%q)", string(name)) }
+func (name queueOption) Type() OptionType   { return QueueOpt }
+func (name queueOption) Value() interface{} { return string(name) }
+
+// TaskID returns an option to specify the task ID.
+func TaskID(id string) Option {
+	return taskIDOption(id)
+}
+
+func (id taskIDOption) String() string     { return fmt.Sprintf("TaskID(%q)", string(id)) }
+func (id taskIDOption) Type() OptionType   { return TaskIDOpt }
+func (id taskIDOption) Value() interface{} { return string(id) }
 
 // Timeout returns an option to specify how long a task may run.
 // If the timeout elapses before the Handler returns, then the task
@@ -135,13 +155,15 @@ func (t deadlineOption) Value() interface{} { return time.Time(t) }
 
 // Unique returns an option to enqueue a task only if the given task is unique.
 // Task enqueued with this option is guaranteed to be unique within the given ttl.
-// Once the task gets processed successfully or once the TTL has expired, another task with the same uniqueness may be enqueued.
+// Once the task gets processed successfully or once the TTL has expired,
+// another task with the same uniqueness may be enqueued.
 // ErrDuplicateTask error is returned when enqueueing a duplicate task.
+// TTL duration must be greater than or equal to 1 second.
 //
 // Uniqueness of a task is based on the following properties:
-//     - Task Type
-//     - Task Payload
-//     - Queue Name
+//   - Task Type
+//   - Task Payload
+//   - Queue Name
 func Unique(ttl time.Duration) Option {
 	return uniqueOption(ttl)
 }
@@ -174,18 +196,47 @@ func (d processInOption) String() string     { return fmt.Sprintf("ProcessIn(%v)
 func (d processInOption) Type() OptionType   { return ProcessInOpt }
 func (d processInOption) Value() interface{} { return time.Duration(d) }
 
+// Retention returns an option to specify the duration of retention period for the task.
+// If this option is provided, the task will be stored as a completed task after successful processing.
+// A completed task will be deleted after the specified duration elapses.
+func Retention(d time.Duration) Option {
+	return retentionOption(d)
+}
+
+func (ttl retentionOption) String() string     { return fmt.Sprintf("Retention(%v)", time.Duration(ttl)) }
+func (ttl retentionOption) Type() OptionType   { return RetentionOpt }
+func (ttl retentionOption) Value() interface{} { return time.Duration(ttl) }
+
+// Group returns an option to specify the group used for the task.
+// Tasks in a given queue with the same group will be aggregated into one task before passed to Handler.
+func Group(name string) Option {
+	return groupOption(name)
+}
+
+func (name groupOption) String() string     { return fmt.Sprintf("Group(%q)", string(name)) }
+func (name groupOption) Type() OptionType   { return GroupOpt }
+func (name groupOption) Value() interface{} { return string(name) }
+
 // ErrDuplicateTask indicates that the given task could not be enqueued since it's a duplicate of another task.
 //
 // ErrDuplicateTask error only applies to tasks enqueued with a Unique option.
 var ErrDuplicateTask = errors.New("task already exists")
 
+// ErrTaskIDConflict indicates that the given task could not be enqueued since its task ID already exists.
+//
+// ErrTaskIDConflict error only applies to tasks enqueued with a TaskID option.
+var ErrTaskIDConflict = errors.New("task ID conflicts with another task")
+
 type option struct {
 	retry     int
 	queue     string
+	taskID    string
 	timeout   time.Duration
 	deadline  time.Time
 	uniqueTTL time.Duration
 	processAt time.Time
+	retention time.Duration
+	group     string
 }
 
 // composeOptions merges user provided options into the default options
@@ -196,7 +247,8 @@ func composeOptions(opts ...Option) (option, error) {
 	res := option{
 		retry:     defaultMaxRetry,
 		queue:     base.DefaultQueueName,
-		timeout:   0, // do not set to deafultTimeout here
+		taskID:    uuid.NewString(),
+		timeout:   0, // do not set to defaultTimeout here
 		deadline:  time.Time{},
 		processAt: time.Now(),
 	}
@@ -210,16 +262,34 @@ func composeOptions(opts ...Option) (option, error) {
 				return option{}, err
 			}
 			res.queue = qname
+		case taskIDOption:
+			id := string(opt)
+			if isBlank(id) {
+				return option{}, errors.New("task ID cannot be empty")
+			}
+			res.taskID = id
 		case timeoutOption:
 			res.timeout = time.Duration(opt)
 		case deadlineOption:
 			res.deadline = time.Time(opt)
 		case uniqueOption:
-			res.uniqueTTL = time.Duration(opt)
+			ttl := time.Duration(opt)
+			if ttl < 1*time.Second {
+				return option{}, errors.New("Unique TTL cannot be less than 1s")
+			}
+			res.uniqueTTL = ttl
 		case processAtOption:
 			res.processAt = time.Time(opt)
 		case processInOption:
 			res.processAt = time.Now().Add(time.Duration(opt))
+		case retentionOption:
+			res.retention = time.Duration(opt)
+		case groupOption:
+			key := string(opt)
+			if isBlank(key) {
+				return option{}, errors.New("group key cannot be empty")
+			}
+			res.group = key
 		default:
 			// ignore unexpected option
 		}
@@ -227,6 +297,11 @@ func composeOptions(opts ...Option) (option, error) {
 	return res, nil
 }
 
+// isBlank returns true if the given s is empty or consist of all whitespaces.
+func isBlank(s string) bool {
+	return strings.TrimSpace(s) == ""
+}
+
 const (
 	// Default max retry count used if nothing is specified.
 	defaultMaxRetry = 25
@@ -241,40 +316,51 @@ var (
 	noDeadline time.Time     = time.Unix(0, 0)
 )
 
-// SetDefaultOptions sets options to be used for a given task type.
-// The argument opts specifies the behavior of task processing.
-// If there are conflicting Option values the last one overrides others.
-//
-// Default options can be overridden by options passed at enqueue time.
-func (c *Client) SetDefaultOptions(taskType string, opts ...Option) {
-	c.mu.Lock()
-	defer c.mu.Unlock()
-	c.opts[taskType] = opts
-}
-
 // Close closes the connection with redis.
 func (c *Client) Close() error {
-	return c.rdb.Close()
+	if c.sharedConnection {
+		return fmt.Errorf("redis connection is shared so the Client can't be closed through asynq")
+	}
+	return c.broker.Close()
 }
 
-// Enqueue enqueues the given task to be processed asynchronously.
+// Enqueue enqueues the given task to a queue.
 //
 // Enqueue returns TaskInfo and nil error if the task is enqueued successfully, otherwise returns a non-nil error.
 //
 // The argument opts specifies the behavior of task processing.
 // If there are conflicting Option values the last one overrides others.
-// By deafult, max retry is set to 25 and timeout is set to 30 minutes.
+// Any options provided to NewTask can be overridden by options passed to Enqueue.
+// By default, max retry is set to 25 and timeout is set to 30 minutes.
 //
 // If no ProcessAt or ProcessIn options are provided, the task will be pending immediately.
+//
+// Enqueue uses context.Background internally; to specify the context, use EnqueueContext.
 func (c *Client) Enqueue(task *Task, opts ...Option) (*TaskInfo, error) {
+	return c.EnqueueContext(context.Background(), task, opts...)
+}
+
+// EnqueueContext enqueues the given task to a queue.
+//
+// EnqueueContext returns TaskInfo and nil error if the task is enqueued successfully, otherwise returns a non-nil error.
+//
+// The argument opts specifies the behavior of task processing.
+// If there are conflicting Option values the last one overrides others.
+// Any options provided to NewTask can be overridden by options passed to Enqueue.
+// By default, max retry is set to 25 and timeout is set to 30 minutes.
+//
+// If no ProcessAt or ProcessIn options are provided, the task will be pending immediately.
+//
+// The first argument context applies to the enqueue operation. To specify task timeout and deadline, use Timeout and Deadline option instead.
+func (c *Client) EnqueueContext(ctx context.Context, task *Task, opts ...Option) (*TaskInfo, error) {
+	if task == nil {
+		return nil, fmt.Errorf("task cannot be nil")
+	}
 	if strings.TrimSpace(task.Type()) == "" {
 		return nil, fmt.Errorf("task typename cannot be empty")
 	}
-	c.mu.Lock()
-	if defaults, ok := c.opts[task.Type()]; ok {
-		opts = append(defaults, opts...)
-	}
-	c.mu.Unlock()
+	// merge task options with the options provided at enqueue time.
+	opts = append(task.opts, opts...)
 	opt, err := composeOptions(opts...)
 	if err != nil {
 		return nil, err
@@ -296,7 +382,7 @@ func (c *Client) Enqueue(task *Task, opts ...Option) (*TaskInfo, error) {
 		uniqueKey = base.UniqueKey(opt.queue, task.Type(), task.Payload())
 	}
 	msg := &base.TaskMessage{
-		ID:        uuid.New(),
+		ID:        opt.taskID,
 		Type:      task.Type(),
 		Payload:   task.Payload(),
 		Queue:     opt.queue,
@@ -304,37 +390,58 @@ func (c *Client) Enqueue(task *Task, opts ...Option) (*TaskInfo, error) {
 		Deadline:  deadline.Unix(),
 		Timeout:   int64(timeout.Seconds()),
 		UniqueKey: uniqueKey,
+		GroupKey:  opt.group,
+		Retention: int64(opt.retention.Seconds()),
 	}
 	now := time.Now()
 	var state base.TaskState
-	if opt.processAt.Before(now) || opt.processAt.Equal(now) {
-		opt.processAt = now
-		err = c.enqueue(msg, opt.uniqueTTL)
-		state = base.TaskStatePending
-	} else {
-		err = c.schedule(msg, opt.processAt, opt.uniqueTTL)
+	if opt.processAt.After(now) {
+		err = c.schedule(ctx, msg, opt.processAt, opt.uniqueTTL)
 		state = base.TaskStateScheduled
+	} else if opt.group != "" {
+		// Use zero value for processAt since we don't know when the task will be aggregated and processed.
+		opt.processAt = time.Time{}
+		err = c.addToGroup(ctx, msg, opt.group, opt.uniqueTTL)
+		state = base.TaskStateAggregating
+	} else {
+		opt.processAt = now
+		err = c.enqueue(ctx, msg, opt.uniqueTTL)
+		state = base.TaskStatePending
 	}
 	switch {
 	case errors.Is(err, errors.ErrDuplicateTask):
 		return nil, fmt.Errorf("%w", ErrDuplicateTask)
+	case errors.Is(err, errors.ErrTaskIdConflict):
+		return nil, fmt.Errorf("%w", ErrTaskIDConflict)
 	case err != nil:
 		return nil, err
 	}
-	return newTaskInfo(msg, state, opt.processAt), nil
+	return newTaskInfo(msg, state, opt.processAt, nil), nil
 }
 
-func (c *Client) enqueue(msg *base.TaskMessage, uniqueTTL time.Duration) error {
-	if uniqueTTL > 0 {
-		return c.rdb.EnqueueUnique(msg, uniqueTTL)
-	}
-	return c.rdb.Enqueue(msg)
+// Ping performs a ping against the redis connection.
+func (c *Client) Ping() error {
+	return c.broker.Ping()
 }
 
-func (c *Client) schedule(msg *base.TaskMessage, t time.Time, uniqueTTL time.Duration) error {
+func (c *Client) enqueue(ctx context.Context, msg *base.TaskMessage, uniqueTTL time.Duration) error {
 	if uniqueTTL > 0 {
-		ttl := t.Add(uniqueTTL).Sub(time.Now())
-		return c.rdb.ScheduleUnique(msg, t, ttl)
+		return c.broker.EnqueueUnique(ctx, msg, uniqueTTL)
 	}
-	return c.rdb.Schedule(msg, t)
+	return c.broker.Enqueue(ctx, msg)
+}
+
+func (c *Client) schedule(ctx context.Context, msg *base.TaskMessage, t time.Time, uniqueTTL time.Duration) error {
+	if uniqueTTL > 0 {
+		ttl := time.Until(t.Add(uniqueTTL))
+		return c.broker.ScheduleUnique(ctx, msg, t, ttl)
+	}
+	return c.broker.Schedule(ctx, msg, t)
+}
+
+func (c *Client) addToGroup(ctx context.Context, msg *base.TaskMessage, group string, uniqueTTL time.Duration) error {
+	if uniqueTTL > 0 {
+		return c.broker.AddToGroupUnique(ctx, msg, group, uniqueTTL)
+	}
+	return c.broker.AddToGroup(ctx, msg, group)
 }

client_test.go

@@ -5,14 +5,16 @@
 package asynq
 
 import (
+	"context"
 	"errors"
 	"testing"
 	"time"
 
 	"github.com/google/go-cmp/cmp"
 	"github.com/google/go-cmp/cmp/cmpopts"
-	h "github.com/hibiken/asynq/internal/asynqtest"
 	"github.com/hibiken/asynq/internal/base"
+	h "github.com/hibiken/asynq/internal/testutil"
+	"github.com/redis/go-redis/v9"
 )
 
 func TestClientEnqueueWithProcessAtOption(t *testing.T) {
@@ -142,11 +144,7 @@ func TestClientEnqueueWithProcessAtOption(t *testing.T) {
 	}
 }
 
-func TestClientEnqueue(t *testing.T) {
-	r := setup(t)
-	client := NewClient(getRedisConnOpt(t))
-	defer client.Close()
-
+func testClientEnqueue(t *testing.T, client *Client, r redis.UniversalClient) {
 	task := NewTask("send_email", h.JSON(map[string]interface{}{"to": "customer@gmail.com", "from": "merchant@example.com"}))
 	now := time.Now()
 
@@ -415,6 +413,40 @@ func TestClientEnqueue(t *testing.T) {
 				},
 			},
 		},
+		{
+			desc: "With Retention option",
+			task: task,
+			opts: []Option{
+				Retention(24 * time.Hour),
+			},
+			wantInfo: &TaskInfo{
+				Queue:         "default",
+				Type:          task.Type(),
+				Payload:       task.Payload(),
+				State:         TaskStatePending,
+				MaxRetry:      defaultMaxRetry,
+				Retried:       0,
+				LastErr:       "",
+				LastFailedAt:  time.Time{},
+				Timeout:       defaultTimeout,
+				Deadline:      time.Time{},
+				NextProcessAt: now,
+				Retention:     24 * time.Hour,
+			},
+			wantPending: map[string][]*base.TaskMessage{
+				"default": {
+					{
+						Type:      task.Type(),
+						Payload:   task.Payload(),
+						Retry:     defaultMaxRetry,
+						Queue:     "default",
+						Timeout:   int64(defaultTimeout.Seconds()),
+						Deadline:  noDeadline.Unix(),
+						Retention: int64((24 * time.Hour).Seconds()),
+					},
+				},
+			},
+		},
 	}
 
 	for _, tc := range tests {
@@ -443,6 +475,270 @@ func TestClientEnqueue(t *testing.T) {
 	}
 }
 
+func TestClientEnqueue(t *testing.T) {
+	r := setup(t)
+	client := NewClient(getRedisConnOpt(t))
+	defer client.Close()
+	testClientEnqueue(t, client, r)
+}
+
+func TestClientFromRedisClientEnqueue(t *testing.T) {
+	r := setup(t)
+	redisClient := getRedisConnOpt(t).MakeRedisClient().(redis.UniversalClient)
+	client := NewClientFromRedisClient(redisClient)
+	testClientEnqueue(t, client, r)
+	err := client.Close()
+	if err == nil {
+		t.Error("client.Close() should have failed because of a shared client but it didn't")
+	}
+}
+
+func TestClientEnqueueWithGroupOption(t *testing.T) {
+	r := setup(t)
+	client := NewClient(getRedisConnOpt(t))
+	defer client.Close()
+
+	task := NewTask("mytask", []byte("foo"))
+	now := time.Now()
+
+	tests := []struct {
+		desc          string
+		task          *Task
+		opts          []Option
+		wantInfo      *TaskInfo
+		wantPending   map[string][]*base.TaskMessage
+		wantGroups    map[string]map[string][]base.Z // map queue name to a set of groups
+		wantScheduled map[string][]base.Z
+	}{
+		{
+			desc: "With only Group option",
+			task: task,
+			opts: []Option{
+				Group("mygroup"),
+			},
+			wantInfo: &TaskInfo{
+				Queue:         "default",
+				Group:         "mygroup",
+				Type:          task.Type(),
+				Payload:       task.Payload(),
+				State:         TaskStateAggregating,
+				MaxRetry:      defaultMaxRetry,
+				Retried:       0,
+				LastErr:       "",
+				LastFailedAt:  time.Time{},
+				Timeout:       defaultTimeout,
+				Deadline:      time.Time{},
+				NextProcessAt: time.Time{},
+			},
+			wantPending: map[string][]*base.TaskMessage{
+				"default": {}, // should not be pending
+			},
+			wantGroups: map[string]map[string][]base.Z{
+				"default": {
+					"mygroup": {
+						{
+							Message: &base.TaskMessage{
+								Type:     task.Type(),
+								Payload:  task.Payload(),
+								Retry:    defaultMaxRetry,
+								Queue:    "default",
+								Timeout:  int64(defaultTimeout.Seconds()),
+								Deadline: noDeadline.Unix(),
+								GroupKey: "mygroup",
+							},
+							Score: now.Unix(),
+						},
+					},
+				},
+			},
+			wantScheduled: map[string][]base.Z{
+				"default": {},
+			},
+		},
+		{
+			desc: "With Group and ProcessAt options",
+			task: task,
+			opts: []Option{
+				Group("mygroup"),
+				ProcessAt(now.Add(30 * time.Minute)),
+			},
+			wantInfo: &TaskInfo{
+				Queue:         "default",
+				Group:         "mygroup",
+				Type:          task.Type(),
+				Payload:       task.Payload(),
+				State:         TaskStateScheduled,
+				MaxRetry:      defaultMaxRetry,
+				Retried:       0,
+				LastErr:       "",
+				LastFailedAt:  time.Time{},
+				Timeout:       defaultTimeout,
+				Deadline:      time.Time{},
+				NextProcessAt: now.Add(30 * time.Minute),
+			},
+			wantPending: map[string][]*base.TaskMessage{
+				"default": {}, // should not be pending
+			},
+			wantGroups: map[string]map[string][]base.Z{
+				"default": {
+					"mygroup": {}, // should not be added to the group yet
+				},
+			},
+			wantScheduled: map[string][]base.Z{
+				"default": {
+					{
+						Message: &base.TaskMessage{
+							Type:     task.Type(),
+							Payload:  task.Payload(),
+							Retry:    defaultMaxRetry,
+							Queue:    "default",
+							Timeout:  int64(defaultTimeout.Seconds()),
+							Deadline: noDeadline.Unix(),
+							GroupKey: "mygroup",
+						},
+						Score: now.Add(30 * time.Minute).Unix(),
+					},
+				},
+			},
+		},
+	}
+
+	for _, tc := range tests {
+		h.FlushDB(t, r) // clean up db before each test case.
+
+		gotInfo, err := client.Enqueue(tc.task, tc.opts...)
+		if err != nil {
+			t.Error(err)
+			continue
+		}
+		cmpOptions := []cmp.Option{
+			cmpopts.IgnoreFields(TaskInfo{}, "ID"),
+			cmpopts.EquateApproxTime(500 * time.Millisecond),
+		}
+		if diff := cmp.Diff(tc.wantInfo, gotInfo, cmpOptions...); diff != "" {
+			t.Errorf("%s;\nEnqueue(task) returned %v, want %v; (-want,+got)\n%s",
+				tc.desc, gotInfo, tc.wantInfo, diff)
+		}
+
+		for qname, want := range tc.wantPending {
+			got := h.GetPendingMessages(t, r, qname)
+			if diff := cmp.Diff(want, got, h.IgnoreIDOpt, cmpopts.EquateEmpty()); diff != "" {
+				t.Errorf("%s;\nmismatch found in %q; (-want,+got)\n%s", tc.desc, base.PendingKey(qname), diff)
+			}
+		}
+
+		for qname, groups := range tc.wantGroups {
+			for groupKey, want := range groups {
+				got := h.GetGroupEntries(t, r, qname, groupKey)
+				if diff := cmp.Diff(want, got, h.IgnoreIDOpt, cmpopts.EquateEmpty()); diff != "" {
+					t.Errorf("%s;\nmismatch found in %q; (-want,+got)\n%s", tc.desc, base.GroupKey(qname, groupKey), diff)
+				}
+			}
+		}
+
+		for qname, want := range tc.wantScheduled {
+			gotScheduled := h.GetScheduledEntries(t, r, qname)
+			if diff := cmp.Diff(want, gotScheduled, h.IgnoreIDOpt, cmpopts.EquateEmpty()); diff != "" {
+				t.Errorf("%s;\nmismatch found in %q; (-want,+got)\n%s", tc.desc, base.ScheduledKey(qname), diff)
+			}
+		}
+	}
+}
+
+func TestClientEnqueueWithTaskIDOption(t *testing.T) {
+	r := setup(t)
+	client := NewClient(getRedisConnOpt(t))
+	defer client.Close()
+
+	task := NewTask("send_email", nil)
+	now := time.Now()
+
+	tests := []struct {
+		desc        string
+		task        *Task
+		opts        []Option
+		wantInfo    *TaskInfo
+		wantPending map[string][]*base.TaskMessage
+	}{
+		{
+			desc: "With a valid TaskID option",
+			task: task,
+			opts: []Option{
+				TaskID("custom_id"),
+			},
+			wantInfo: &TaskInfo{
+				ID:            "custom_id",
+				Queue:         "default",
+				Type:          task.Type(),
+				Payload:       task.Payload(),
+				State:         TaskStatePending,
+				MaxRetry:      defaultMaxRetry,
+				Retried:       0,
+				LastErr:       "",
+				LastFailedAt:  time.Time{},
+				Timeout:       defaultTimeout,
+				Deadline:      time.Time{},
+				NextProcessAt: now,
+			},
+			wantPending: map[string][]*base.TaskMessage{
+				"default": {
+					{
+						ID:       "custom_id",
+						Type:     task.Type(),
+						Payload:  task.Payload(),
+						Retry:    defaultMaxRetry,
+						Queue:    "default",
+						Timeout:  int64(defaultTimeout.Seconds()),
+						Deadline: noDeadline.Unix(),
+					},
+				},
+			},
+		},
+	}
+
+	for _, tc := range tests {
+		h.FlushDB(t, r) // clean up db before each test case.
+
+		gotInfo, err := client.Enqueue(tc.task, tc.opts...)
+		if err != nil {
+			t.Errorf("got non-nil error %v, want nil", err)
+			continue
+		}
+
+		cmpOptions := []cmp.Option{
+			cmpopts.EquateApproxTime(500 * time.Millisecond),
+		}
+		if diff := cmp.Diff(tc.wantInfo, gotInfo, cmpOptions...); diff != "" {
+			t.Errorf("%s;\nEnqueue(task) returned %v, want %v; (-want,+got)\n%s",
+				tc.desc, gotInfo, tc.wantInfo, diff)
+		}
+
+		for qname, want := range tc.wantPending {
+			got := h.GetPendingMessages(t, r, qname)
+			if diff := cmp.Diff(want, got); diff != "" {
+				t.Errorf("%s;\nmismatch found in %q; (-want,+got)\n%s", tc.desc, base.PendingKey(qname), diff)
+			}
+		}
+	}
+}
+
+func TestClientEnqueueWithConflictingTaskID(t *testing.T) {
+	setup(t)
+	client := NewClient(getRedisConnOpt(t))
+	defer client.Close()
+
+	const taskID = "custom_id"
+	task := NewTask("foo", nil)
+
+	if _, err := client.Enqueue(task, TaskID(taskID)); err != nil {
+		t.Fatalf("First task: Enqueue failed: %v", err)
+	}
+	_, err := client.Enqueue(task, TaskID(taskID))
+	if !errors.Is(err, ErrTaskIDConflict) {
+		t.Errorf("Second task: Enqueue returned %v, want %v", err, ErrTaskIDConflict)
+	}
+}
+
 func TestClientEnqueueWithProcessInOption(t *testing.T) {
 	r := setup(t)
 	client := NewClient(getRedisConnOpt(t))
@@ -578,6 +874,11 @@ func TestClientEnqueueError(t *testing.T) {
 		task *Task
 		opts []Option
 	}{
+		{
+			desc: "With nil task",
+			task: nil,
+			opts: []Option{},
+		},
 		{
 			desc: "With empty queue name",
 			task: task,
@@ -595,6 +896,21 @@ func TestClientEnqueueError(t *testing.T) {
 			task: NewTask("    ", h.JSON(map[string]interface{}{})),
 			opts: []Option{},
 		},
+		{
+			desc: "With empty task ID",
+			task: NewTask("foo", nil),
+			opts: []Option{TaskID("")},
+		},
+		{
+			desc: "With blank task ID",
+			task: NewTask("foo", nil),
+			opts: []Option{TaskID("  ")},
+		},
+		{
+			desc: "With unique option less than 1s",
+			task: NewTask("foo", nil),
+			opts: []Option{Unique(300 * time.Millisecond)},
+		},
 	}
 
 	for _, tc := range tests {
@@ -607,16 +923,17 @@ func TestClientEnqueueError(t *testing.T) {
 	}
 }
 
-func TestClientDefaultOptions(t *testing.T) {
+func TestClientWithDefaultOptions(t *testing.T) {
 	r := setup(t)
 
 	now := time.Now()
 
 	tests := []struct {
 		desc        string
-		defaultOpts []Option // options set at the client level.
+		defaultOpts []Option // options set at task initialization time
 		opts        []Option // options used at enqueue time.
-		task        *Task
+		tasktype    string
+		payload     []byte
 		wantInfo    *TaskInfo
 		queue       string // queue that the message should go into.
 		want        *base.TaskMessage
@@ -625,7 +942,8 @@ func TestClientDefaultOptions(t *testing.T) {
 			desc:        "With queue routing option",
 			defaultOpts: []Option{Queue("feed")},
 			opts:        []Option{},
-			task:        NewTask("feed:import", nil),
+			tasktype:    "feed:import",
+			payload:     nil,
 			wantInfo: &TaskInfo{
 				Queue:         "feed",
 				Type:          "feed:import",
@@ -653,7 +971,8 @@ func TestClientDefaultOptions(t *testing.T) {
 			desc:        "With multiple options",
 			defaultOpts: []Option{Queue("feed"), MaxRetry(5)},
 			opts:        []Option{},
-			task:        NewTask("feed:import", nil),
+			tasktype:    "feed:import",
+			payload:     nil,
 			wantInfo: &TaskInfo{
 				Queue:         "feed",
 				Type:          "feed:import",
@@ -681,7 +1000,8 @@ func TestClientDefaultOptions(t *testing.T) {
 			desc:        "With overriding options at enqueue time",
 			defaultOpts: []Option{Queue("feed"), MaxRetry(5)},
 			opts:        []Option{Queue("critical")},
-			task:        NewTask("feed:import", nil),
+			tasktype:    "feed:import",
+			payload:     nil,
 			wantInfo: &TaskInfo{
 				Queue:         "critical",
 				Type:          "feed:import",
@@ -710,8 +1030,8 @@ func TestClientDefaultOptions(t *testing.T) {
 		h.FlushDB(t, r)
 		c := NewClient(getRedisConnOpt(t))
 		defer c.Close()
-		c.SetDefaultOptions(tc.task.Type(), tc.defaultOpts...)
-		gotInfo, err := c.Enqueue(tc.task, tc.opts...)
+		task := NewTask(tc.tasktype, tc.payload, tc.defaultOpts...)
+		gotInfo, err := c.Enqueue(task, tc.opts...)
 		if err != nil {
 			t.Fatal(err)
 		}
@@ -761,7 +1081,7 @@ func TestClientEnqueueUnique(t *testing.T) {
 			t.Fatal(err)
 		}
 
-		gotTTL := r.TTL(base.UniqueKey(base.DefaultQueueName, tc.task.Type(), tc.task.Payload())).Val()
+		gotTTL := r.TTL(context.Background(), base.UniqueKey(base.DefaultQueueName, tc.task.Type(), tc.task.Payload())).Val()
 		if !cmp.Equal(tc.ttl.Seconds(), gotTTL.Seconds(), cmpopts.EquateApprox(0, 1)) {
 			t.Errorf("TTL = %v, want %v", gotTTL, tc.ttl)
 			continue
@@ -806,7 +1126,7 @@ func TestClientEnqueueUniqueWithProcessInOption(t *testing.T) {
 			t.Fatal(err)
 		}
 
-		gotTTL := r.TTL(base.UniqueKey(base.DefaultQueueName, tc.task.Type(), tc.task.Payload())).Val()
+		gotTTL := r.TTL(context.Background(), base.UniqueKey(base.DefaultQueueName, tc.task.Type(), tc.task.Payload())).Val()
 		wantTTL := time.Duration(tc.ttl.Seconds()+tc.d.Seconds()) * time.Second
 		if !cmp.Equal(wantTTL.Seconds(), gotTTL.Seconds(), cmpopts.EquateApprox(0, 1)) {
 			t.Errorf("TTL = %v, want %v", gotTTL, wantTTL)
@@ -852,8 +1172,8 @@ func TestClientEnqueueUniqueWithProcessAtOption(t *testing.T) {
 			t.Fatal(err)
 		}
 
-		gotTTL := r.TTL(base.UniqueKey(base.DefaultQueueName, tc.task.Type(), tc.task.Payload())).Val()
-		wantTTL := tc.at.Add(tc.ttl).Sub(time.Now())
+		gotTTL := r.TTL(context.Background(), base.UniqueKey(base.DefaultQueueName, tc.task.Type(), tc.task.Payload())).Val()
+		wantTTL := time.Until(tc.at.Add(tc.ttl))
 		if !cmp.Equal(wantTTL.Seconds(), gotTTL.Seconds(), cmpopts.EquateApprox(0, 1)) {
 			t.Errorf("TTL = %v, want %v", gotTTL, wantTTL)
 			continue

context.go

@@ -6,49 +6,16 @@ package asynq
 
 import (
 	"context"
-	"time"
 
-	"github.com/hibiken/asynq/internal/base"
+	asynqcontext "github.com/hibiken/asynq/internal/context"
 )
 
-// A taskMetadata holds task scoped data to put in context.
-type taskMetadata struct {
-	id         string
-	maxRetry   int
-	retryCount int
-	qname      string
-}
-
-// ctxKey type is unexported to prevent collisions with context keys defined in
-// other packages.
-type ctxKey int
-
-// metadataCtxKey is the context key for the task metadata.
-// Its value of zero is arbitrary.
-const metadataCtxKey ctxKey = 0
-
-// createContext returns a context and cancel function for a given task message.
-func createContext(msg *base.TaskMessage, deadline time.Time) (context.Context, context.CancelFunc) {
-	metadata := taskMetadata{
-		id:         msg.ID.String(),
-		maxRetry:   msg.Retry,
-		retryCount: msg.Retried,
-		qname:      msg.Queue,
-	}
-	ctx := context.WithValue(context.Background(), metadataCtxKey, metadata)
-	return context.WithDeadline(ctx, deadline)
-}
-
 // GetTaskID extracts a task ID from a context, if any.
 //
 // ID of a task is guaranteed to be unique.
 // ID of a task doesn't change if the task is being retried.
 func GetTaskID(ctx context.Context) (id string, ok bool) {
-	metadata, ok := ctx.Value(metadataCtxKey).(taskMetadata)
-	if !ok {
-		return "", false
-	}
-	return metadata.id, true
+	return asynqcontext.GetTaskID(ctx)
 }
 
 // GetRetryCount extracts retry count from a context, if any.
@@ -56,32 +23,20 @@ func GetTaskID(ctx context.Context) (id string, ok bool) {
 // Return value n indicates the number of times associated task has been
 // retried so far.
 func GetRetryCount(ctx context.Context) (n int, ok bool) {
-	metadata, ok := ctx.Value(metadataCtxKey).(taskMetadata)
-	if !ok {
-		return 0, false
-	}
-	return metadata.retryCount, true
+	return asynqcontext.GetRetryCount(ctx)
 }
 
 // GetMaxRetry extracts maximum retry from a context, if any.
 //
-// Return value n indicates the maximum number of times the assoicated task
+// Return value n indicates the maximum number of times the associated task
 // can be retried if ProcessTask returns a non-nil error.
 func GetMaxRetry(ctx context.Context) (n int, ok bool) {
-	metadata, ok := ctx.Value(metadataCtxKey).(taskMetadata)
-	if !ok {
-		return 0, false
-	}
-	return metadata.maxRetry, true
+	return asynqcontext.GetMaxRetry(ctx)
 }
 
 // GetQueueName extracts queue name from a context, if any.
 //
-// Return value qname indicates which queue the task was pulled from.
-func GetQueueName(ctx context.Context) (qname string, ok bool) {
-	metadata, ok := ctx.Value(metadataCtxKey).(taskMetadata)
-	if !ok {
-		return "", false
-	}
-	return metadata.qname, true
+// Return value queue indicates which queue the task was pulled from.
+func GetQueueName(ctx context.Context) (queue string, ok bool) {
+	return asynqcontext.GetQueueName(ctx)
 }

example_test.go

@@ -5,6 +5,7 @@
 package asynq_test
 
 import (
+	"context"
 	"fmt"
 	"log"
 	"os"
@@ -113,3 +114,20 @@ func ExampleParseRedisURI() {
 	// localhost:6379
 	// 10
 }
+
+func ExampleResultWriter() {
+	// ResultWriter is only accessible in Handler.
+	h := func(ctx context.Context, task *asynq.Task) error {
+		// .. do task processing work
+
+		res := []byte("task result data")
+		n, err := task.ResultWriter().Write(res) // implements io.Writer
+		if err != nil {
+			return fmt.Errorf("failed to write task result: %v", err)
+		}
+		log.Printf(" %d bytes written", n)
+		return nil
+	}
+
+	_ = h
+}

forwarder.go

@@ -56,13 +56,15 @@ func (f *forwarder) start(wg *sync.WaitGroup) {
 	wg.Add(1)
 	go func() {
 		defer wg.Done()
+		timer := time.NewTimer(f.avgInterval)
 		for {
 			select {
 			case <-f.done:
 				f.logger.Debug("Forwarder done")
 				return
-			case <-time.After(f.avgInterval):
+			case <-timer.C:
 				f.exec()
+				timer.Reset(f.avgInterval)
 			}
 		}
 	}()
@@ -70,6 +72,6 @@ func (f *forwarder) start(wg *sync.WaitGroup) {
 
 func (f *forwarder) exec() {
 	if err := f.broker.ForwardIfReady(f.queues...); err != nil {
-		f.logger.Errorf("Could not enqueue scheduled tasks: %v", err)
+		f.logger.Errorf("Failed to forward scheduled tasks: %v", err)
 	}
 }

forwarder_test.go

@@ -10,9 +10,9 @@ import (
 	"time"
 
 	"github.com/google/go-cmp/cmp"
-	h "github.com/hibiken/asynq/internal/asynqtest"
 	"github.com/hibiken/asynq/internal/base"
 	"github.com/hibiken/asynq/internal/rdb"
+	h "github.com/hibiken/asynq/internal/testutil"
 )
 
 func TestForwarder(t *testing.T) {

go.mod

@@ -1,17 +1,20 @@
 module github.com/hibiken/asynq
 
-go 1.13
+go 1.22
 
 require (
-	github.com/go-redis/redis/v7 v7.4.0
-	github.com/golang/protobuf v1.4.1
-	github.com/google/go-cmp v0.5.0
-	github.com/google/uuid v1.2.0
+	github.com/google/go-cmp v0.6.0
+	github.com/google/uuid v1.6.0
+	github.com/redis/go-redis/v9 v9.7.0
 	github.com/robfig/cron/v3 v3.0.1
-	github.com/spf13/cast v1.3.1
-	go.uber.org/goleak v0.10.0
-	golang.org/x/sys v0.0.0-20191204072324-ce4227a45e2e
-	golang.org/x/time v0.0.0-20190308202827-9d24e82272b4
-	google.golang.org/protobuf v1.25.0
-	gopkg.in/yaml.v2 v2.2.7 // indirect
+	github.com/spf13/cast v1.7.0
+	go.uber.org/goleak v1.3.0
+	golang.org/x/sys v0.27.0
+	golang.org/x/time v0.8.0
+	google.golang.org/protobuf v1.35.2
+)
+
+require (
+	github.com/cespare/xxhash/v2 v2.2.0 // indirect
+	github.com/dgryski/go-rendezvous v0.0.0-20200823014737-9f7001d12a5f // indirect
 )

go.sum

@@ -1,128 +1,42 @@
-cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
-github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
-github.com/census-instrumentation/opencensus-proto v0.2.1/go.mod h1:f6KPmirojxKA12rnyqOA5BBL4O983OfeGPqjHWSTneU=
-github.com/client9/misspell v0.3.4/go.mod h1:qj6jICC3Q7zFZvVWo7KLAzC3yx5G7kyvSDkc90ppPyw=
+github.com/bsm/ginkgo/v2 v2.12.0 h1:Ny8MWAHyOepLGlLKYmXG4IEkioBysk6GpaRTLC8zwWs=
+github.com/bsm/ginkgo/v2 v2.12.0/go.mod h1:SwYbGRRDovPVboqFv0tPTcG1sN61LM1Z4ARdbAV9g4c=
+github.com/bsm/gomega v1.27.10 h1:yeMWxP2pV2fG3FgAODIY8EiRE3dy0aeFYt4l7wh6yKA=
+github.com/bsm/gomega v1.27.10/go.mod h1:JyEr/xRbxbtgWNi8tIEVPUYZ5Dzef52k01W3YH0H+O0=
+github.com/cespare/xxhash/v2 v2.2.0 h1:DC2CZ1Ep5Y4k3ZQ899DldepgrayRUGE6BBZ/cd9Cj44=
+github.com/cespare/xxhash/v2 v2.2.0/go.mod h1:VGX0DQ3Q6kWi7AoAeZDth3/j3BFtOZR5XLFGgcrjCOs=
 github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
-github.com/envoyproxy/go-control-plane v0.9.1-0.20191026205805-5f8ba28d4473/go.mod h1:YTl/9mNaCwkRvm6d1a2C3ymFceY/DCBVvsKhRF0iEA4=
-github.com/envoyproxy/protoc-gen-validate v0.1.0/go.mod h1:iSmxcyjqTsJpI2R4NaDN7+kN2VEUnK/pcBlmesArF7c=
-github.com/fsnotify/fsnotify v1.4.7 h1:IXs+QLmnXW2CcXuY+8Mzv/fWEsPGWxqefPtCP5CnV9I=
-github.com/fsnotify/fsnotify v1.4.7/go.mod h1:jwhsz4b93w/PPRr/qN1Yymfu8t87LnFCMoQvtojpjFo=
-github.com/go-redis/redis/v7 v7.2.0 h1:CrCexy/jYWZjW0AyVoHlcJUeZN19VWlbepTh1Vq6dJs=
-github.com/go-redis/redis/v7 v7.2.0/go.mod h1:JDNMw23GTyLNC4GZu9njt15ctBQVn7xjRfnwdHj/Dcg=
-github.com/go-redis/redis/v7 v7.4.0 h1:7obg6wUoj05T0EpY0o8B59S9w5yeMWql7sw2kwNW1x4=
-github.com/go-redis/redis/v7 v7.4.0/go.mod h1:JDNMw23GTyLNC4GZu9njt15ctBQVn7xjRfnwdHj/Dcg=
-github.com/golang/glog v0.0.0-20160126235308-23def4e6c14b/go.mod h1:SBH7ygxi8pfUlaOkMMuAQtPIUF8ecWP5IEl/CR7VP2Q=
-github.com/golang/mock v1.1.1/go.mod h1:oTYuIxOrZwtPieC+H1uAHpcLFnEyAGVDL/k47Jfbm0A=
-github.com/golang/protobuf v1.2.0/go.mod h1:6lQm79b+lXiMfvg/cZm0SGofjICqVBUtrP5yJMmIC1U=
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+go.uber.org/goleak v1.3.0 h1:2K3zAYmnTNqV73imy9J1T3WC+gmCePx2hEGkimedGto=
+go.uber.org/goleak v1.3.0/go.mod h1:CoHD4mav9JJNrW/WLlf7HGZPjdw8EucARQHekz1X6bE=
+golang.org/x/sys v0.27.0 h1:wBqf8DvsY9Y/2P8gAfPDEYNuS30J4lPHJxXSb/nJZ+s=
+golang.org/x/sys v0.27.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=
+golang.org/x/time v0.8.0 h1:9i3RxcPv3PZnitoVGMPDKZSq1xW1gK1Xy3ArNOGZfEg=
+golang.org/x/time v0.8.0/go.mod h1:3BpzKBy/shNhVucY/MWOyx10tF3SFh9QdLuxbVysPQM=
+google.golang.org/protobuf v1.35.2 h1:8Ar7bF+apOIoThw1EdZl0p1oWvMqTHmpA2fRTyZO8io=
+google.golang.org/protobuf v1.35.2/go.mod h1:9fA7Ob0pmnwhb644+1+CVWFRbNajQ6iRojtC/QF5bRE=
+gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
+gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=

heartbeat.go

@@ -12,6 +12,7 @@ import (
 	"github.com/google/uuid"
 	"github.com/hibiken/asynq/internal/base"
 	"github.com/hibiken/asynq/internal/log"
+	"github.com/hibiken/asynq/internal/timeutil"
 )
 
 // heartbeater is responsible for writing process info to redis periodically to
@@ -19,6 +20,7 @@ import (
 type heartbeater struct {
 	logger *log.Logger
 	broker base.Broker
+	clock  timeutil.Clock
 
 	// channel to communicate back to the long running "heartbeater" goroutine.
 	done chan struct{}
@@ -41,7 +43,7 @@ type heartbeater struct {
 	workers map[string]*workerInfo
 
 	// state is shared with other goroutine but is concurrency safe.
-	state *base.ServerState
+	state *serverState
 
 	// channels to receive updates on active workers.
 	starting <-chan *workerInfo
@@ -55,7 +57,7 @@ type heartbeaterParams struct {
 	concurrency    int
 	queues         map[string]int
 	strictPriority bool
-	state          *base.ServerState
+	state          *serverState
 	starting       <-chan *workerInfo
 	finished       <-chan *base.TaskMessage
 }
@@ -69,6 +71,7 @@ func newHeartbeater(params heartbeaterParams) *heartbeater {
 	return &heartbeater{
 		logger:   params.logger,
 		broker:   params.broker,
+		clock:    timeutil.NewRealClock(),
 		done:     make(chan struct{}),
 		interval: params.interval,
 
@@ -100,6 +103,8 @@ type workerInfo struct {
 	started time.Time
 	// deadline the worker has to finish processing the task by.
 	deadline time.Time
+	// lease the worker holds for the task.
+	lease *base.Lease
 }
 
 func (h *heartbeater) start(wg *sync.WaitGroup) {
@@ -107,7 +112,7 @@ func (h *heartbeater) start(wg *sync.WaitGroup) {
 	go func() {
 		defer wg.Done()
 
-		h.started = time.Now()
+		h.started = h.clock.Now()
 
 		h.beat()
 
@@ -115,7 +120,9 @@ func (h *heartbeater) start(wg *sync.WaitGroup) {
 		for {
 			select {
 			case <-h.done:
-				h.broker.ClearServerState(h.host, h.pid, h.serverID)
+				if err := h.broker.ClearServerState(h.host, h.pid, h.serverID); err != nil {
+					h.logger.Errorf("Failed to clear server state: %v", err)
+				}
 				h.logger.Debug("Heartbeater done")
 				timer.Stop()
 				return
@@ -125,16 +132,21 @@ func (h *heartbeater) start(wg *sync.WaitGroup) {
 				timer.Reset(h.interval)
 
 			case w := <-h.starting:
-				h.workers[w.msg.ID.String()] = w
+				h.workers[w.msg.ID] = w
 
 			case msg := <-h.finished:
-				delete(h.workers, msg.ID.String())
+				delete(h.workers, msg.ID)
 			}
 		}
 	}()
 }
 
+// beat extends lease for workers and writes server/worker info to redis.
 func (h *heartbeater) beat() {
+	h.state.mu.Lock()
+	srvStatus := h.state.value.String()
+	h.state.mu.Unlock()
+
 	info := base.ServerInfo{
 		Host:              h.host,
 		PID:               h.pid,
@@ -142,12 +154,13 @@ func (h *heartbeater) beat() {
 		Concurrency:       h.concurrency,
 		Queues:            h.queues,
 		StrictPriority:    h.strictPriority,
-		Status:            h.state.String(),
+		Status:            srvStatus,
 		Started:           h.started,
 		ActiveWorkerCount: len(h.workers),
 	}
 
 	var ws []*base.WorkerInfo
+	idsByQueue := make(map[string][]string)
 	for id, w := range h.workers {
 		ws = append(ws, &base.WorkerInfo{
 			Host:     h.host,
@@ -160,11 +173,30 @@ func (h *heartbeater) beat() {
 			Started:  w.started,
 			Deadline: w.deadline,
 		})
+		// Check lease before adding to the set to make sure not to extend the lease if the lease is already expired.
+		if w.lease.IsValid() {
+			idsByQueue[w.msg.Queue] = append(idsByQueue[w.msg.Queue], id)
+		} else {
+			w.lease.NotifyExpiration() // notify processor if the lease is expired
+		}
 	}
 
 	// Note: Set TTL to be long enough so that it won't expire before we write again
 	// and short enough to expire quickly once the process is shut down or killed.
 	if err := h.broker.WriteServerState(&info, ws, h.interval*2); err != nil {
-		h.logger.Errorf("could not write server state data: %v", err)
+		h.logger.Errorf("Failed to write server state data: %v", err)
+	}
+
+	for qname, ids := range idsByQueue {
+		expirationTime, err := h.broker.ExtendLease(qname, ids...)
+		if err != nil {
+			h.logger.Errorf("Failed to extend lease for tasks %v: %v", ids, err)
+			continue
+		}
+		for _, id := range ids {
+			if l := h.workers[id].lease; !l.Reset(expirationTime) {
+				h.logger.Warnf("Lease reset failed for %s; lease deadline: %v", id, l.Deadline())
+			}
+		}
 	}
 }

heartbeat_test.go

@@ -5,31 +5,154 @@
 package asynq
 
 import (
+	"context"
 	"sync"
 	"testing"
 	"time"
 
 	"github.com/google/go-cmp/cmp"
 	"github.com/google/go-cmp/cmp/cmpopts"
-	h "github.com/hibiken/asynq/internal/asynqtest"
 	"github.com/hibiken/asynq/internal/base"
 	"github.com/hibiken/asynq/internal/rdb"
 	"github.com/hibiken/asynq/internal/testbroker"
+	h "github.com/hibiken/asynq/internal/testutil"
+	"github.com/hibiken/asynq/internal/timeutil"
 )
 
+// Test goes through a few phases.
+//
+// Phase1: Simulate Server startup; Simulate starting tasks listed in startedWorkers
+// Phase2: Simulate finishing tasks listed in finishedTasks
+// Phase3: Simulate Server shutdown;
 func TestHeartbeater(t *testing.T) {
 	r := setup(t)
 	defer r.Close()
 	rdbClient := rdb.NewRDB(r)
 
+	now := time.Now()
+	const elapsedTime = 10 * time.Second // simulated time elapsed between phase1 and phase2
+
+	clock := timeutil.NewSimulatedClock(time.Time{}) // time will be set in each test
+
+	t1 := h.NewTaskMessageWithQueue("task1", nil, "default")
+	t2 := h.NewTaskMessageWithQueue("task2", nil, "default")
+	t3 := h.NewTaskMessageWithQueue("task3", nil, "default")
+	t4 := h.NewTaskMessageWithQueue("task4", nil, "custom")
+	t5 := h.NewTaskMessageWithQueue("task5", nil, "custom")
+	t6 := h.NewTaskMessageWithQueue("task6", nil, "default")
+
+	// Note: intentionally set to time less than now.Add(rdb.LeaseDuration) to test lease extension is working.
+	lease1 := h.NewLeaseWithClock(now.Add(10*time.Second), clock)
+	lease2 := h.NewLeaseWithClock(now.Add(10*time.Second), clock)
+	lease3 := h.NewLeaseWithClock(now.Add(10*time.Second), clock)
+	lease4 := h.NewLeaseWithClock(now.Add(10*time.Second), clock)
+	lease5 := h.NewLeaseWithClock(now.Add(10*time.Second), clock)
+	lease6 := h.NewLeaseWithClock(now.Add(10*time.Second), clock)
+
 	tests := []struct {
-		interval    time.Duration
+		desc string
+
+		// Interval between heartbeats.
+		interval time.Duration
+
+		// Server info.
 		host        string
 		pid         int
 		queues      map[string]int
 		concurrency int
+
+		active         map[string][]*base.TaskMessage // initial active set state
+		lease          map[string][]base.Z            // initial lease set state
+		wantLease1     map[string][]base.Z            // expected lease set state after starting all startedWorkers
+		wantLease2     map[string][]base.Z            // expected lease set state after finishing all finishedTasks
+		startedWorkers []*workerInfo                  // workerInfo to send via the started channel
+		finishedTasks  []*base.TaskMessage            // tasks to send via the finished channel
+
+		startTime   time.Time     // simulated start time
+		elapsedTime time.Duration // simulated time elapsed between starting and finishing processing tasks
 	}{
-		{2 * time.Second, "localhost", 45678, map[string]int{"default": 1}, 10},
+		{
+			desc:        "With single queue",
+			interval:    2 * time.Second,
+			host:        "localhost",
+			pid:         45678,
+			queues:      map[string]int{"default": 1},
+			concurrency: 10,
+			active: map[string][]*base.TaskMessage{
+				"default": {t1, t2, t3},
+			},
+			lease: map[string][]base.Z{
+				"default": {
+					{Message: t1, Score: now.Add(10 * time.Second).Unix()},
+					{Message: t2, Score: now.Add(10 * time.Second).Unix()},
+					{Message: t3, Score: now.Add(10 * time.Second).Unix()},
+				},
+			},
+			startedWorkers: []*workerInfo{
+				{msg: t1, started: now, deadline: now.Add(2 * time.Minute), lease: lease1},
+				{msg: t2, started: now, deadline: now.Add(2 * time.Minute), lease: lease2},
+				{msg: t3, started: now, deadline: now.Add(2 * time.Minute), lease: lease3},
+			},
+			finishedTasks: []*base.TaskMessage{t1, t2},
+			wantLease1: map[string][]base.Z{
+				"default": {
+					{Message: t1, Score: now.Add(rdb.LeaseDuration).Unix()},
+					{Message: t2, Score: now.Add(rdb.LeaseDuration).Unix()},
+					{Message: t3, Score: now.Add(rdb.LeaseDuration).Unix()},
+				},
+			},
+			wantLease2: map[string][]base.Z{
+				"default": {
+					{Message: t3, Score: now.Add(elapsedTime).Add(rdb.LeaseDuration).Unix()},
+				},
+			},
+			startTime:   now,
+			elapsedTime: elapsedTime,
+		},
+		{
+			desc:        "With multiple queue",
+			interval:    2 * time.Second,
+			host:        "localhost",
+			pid:         45678,
+			queues:      map[string]int{"default": 1, "custom": 2},
+			concurrency: 10,
+			active: map[string][]*base.TaskMessage{
+				"default": {t6},
+				"custom":  {t4, t5},
+			},
+			lease: map[string][]base.Z{
+				"default": {
+					{Message: t6, Score: now.Add(10 * time.Second).Unix()},
+				},
+				"custom": {
+					{Message: t4, Score: now.Add(10 * time.Second).Unix()},
+					{Message: t5, Score: now.Add(10 * time.Second).Unix()},
+				},
+			},
+			startedWorkers: []*workerInfo{
+				{msg: t6, started: now, deadline: now.Add(2 * time.Minute), lease: lease6},
+				{msg: t4, started: now, deadline: now.Add(2 * time.Minute), lease: lease4},
+				{msg: t5, started: now, deadline: now.Add(2 * time.Minute), lease: lease5},
+			},
+			finishedTasks: []*base.TaskMessage{t6, t5},
+			wantLease1: map[string][]base.Z{
+				"default": {
+					{Message: t6, Score: now.Add(rdb.LeaseDuration).Unix()},
+				},
+				"custom": {
+					{Message: t4, Score: now.Add(rdb.LeaseDuration).Unix()},
+					{Message: t5, Score: now.Add(rdb.LeaseDuration).Unix()},
+				},
+			},
+			wantLease2: map[string][]base.Z{
+				"default": {},
+				"custom": {
+					{Message: t4, Score: now.Add(elapsedTime).Add(rdb.LeaseDuration).Unix()},
+				},
+			},
+			startTime:   now,
+			elapsedTime: elapsedTime,
+		},
 	}
 
 	timeCmpOpt := cmpopts.EquateApproxTime(10 * time.Millisecond)
@@ -37,8 +160,15 @@ func TestHeartbeater(t *testing.T) {
 	ignoreFieldOpt := cmpopts.IgnoreFields(base.ServerInfo{}, "ServerID")
 	for _, tc := range tests {
 		h.FlushDB(t, r)
+		h.SeedAllActiveQueues(t, r, tc.active)
+		h.SeedAllLease(t, r, tc.lease)
 
-		state := base.NewServerState()
+		clock.SetTime(tc.startTime)
+		rdbClient.SetClock(clock)
+
+		srvState := &serverState{}
+		startingCh := make(chan *workerInfo)
+		finishedCh := make(chan *base.TaskMessage)
 		hb := newHeartbeater(heartbeaterParams{
 			logger:         testLogger,
 			broker:         rdbClient,
@@ -46,72 +176,134 @@ func TestHeartbeater(t *testing.T) {
 			concurrency:    tc.concurrency,
 			queues:         tc.queues,
 			strictPriority: false,
-			state:          state,
-			starting:       make(chan *workerInfo),
-			finished:       make(chan *base.TaskMessage),
+			state:          srvState,
+			starting:       startingCh,
+			finished:       finishedCh,
 		})
+		hb.clock = clock
 
 		// Change host and pid fields for testing purpose.
 		hb.host = tc.host
 		hb.pid = tc.pid
 
-		state.Set(base.StateActive)
+		//===================
+		// Start Phase1
+		//===================
+
+		srvState.mu.Lock()
+		srvState.value = srvStateActive // simulating Server.Start
+		srvState.mu.Unlock()
+
 		var wg sync.WaitGroup
 		hb.start(&wg)
 
-		want := &base.ServerInfo{
-			Host:        tc.host,
-			PID:         tc.pid,
-			Queues:      tc.queues,
-			Concurrency: tc.concurrency,
-			Started:     time.Now(),
-			Status:      "active",
+		// Simulate processor starting to work on tasks.
+		for _, w := range tc.startedWorkers {
+			startingCh <- w
 		}
 
-		// allow for heartbeater to write to redis
-		time.Sleep(tc.interval)
+		// Wait for heartbeater to write to redis
+		time.Sleep(tc.interval * 2)
 
 		ss, err := rdbClient.ListServers()
 		if err != nil {
-			t.Errorf("could not read server info from redis: %v", err)
+			t.Errorf("%s: could not read server info from redis: %v", tc.desc, err)
 			hb.shutdown()
 			continue
 		}
 
 		if len(ss) != 1 {
-			t.Errorf("(*RDB).ListServers returned %d process info, want 1", len(ss))
+			t.Errorf("%s: (*RDB).ListServers returned %d server info, want 1", tc.desc, len(ss))
 			hb.shutdown()
 			continue
 		}
 
-		if diff := cmp.Diff(want, ss[0], timeCmpOpt, ignoreOpt, ignoreFieldOpt); diff != "" {
-			t.Errorf("redis stored process status %+v, want %+v; (-want, +got)\n%s", ss[0], want, diff)
+		wantInfo := &base.ServerInfo{
+			Host:              tc.host,
+			PID:               tc.pid,
+			Queues:            tc.queues,
+			Concurrency:       tc.concurrency,
+			Started:           now,
+			Status:            "active",
+			ActiveWorkerCount: len(tc.startedWorkers),
+		}
+		if diff := cmp.Diff(wantInfo, ss[0], timeCmpOpt, ignoreOpt, ignoreFieldOpt); diff != "" {
+			t.Errorf("%s: redis stored server status %+v, want %+v; (-want, +got)\n%s", tc.desc, ss[0], wantInfo, diff)
 			hb.shutdown()
 			continue
 		}
 
-		// status change
-		state.Set(base.StateClosed)
+		for qname, wantLease := range tc.wantLease1 {
+			gotLease := h.GetLeaseEntries(t, r, qname)
+			if diff := cmp.Diff(wantLease, gotLease, h.SortZSetEntryOpt); diff != "" {
+				t.Errorf("%s: mismatch found in %q: (-want,+got):\n%s", tc.desc, base.LeaseKey(qname), diff)
+			}
+		}
 
-		// allow for heartbeater to write to redis
+		for _, w := range tc.startedWorkers {
+			if want := now.Add(rdb.LeaseDuration); w.lease.Deadline() != want {
+				t.Errorf("%s: lease deadline for %v is set to %v, want %v", tc.desc, w.msg, w.lease.Deadline(), want)
+			}
+		}
+
+		//===================
+		// Start Phase2
+		//===================
+
+		clock.AdvanceTime(tc.elapsedTime)
+		// Simulate processor finished processing tasks.
+		for _, msg := range tc.finishedTasks {
+			if err := rdbClient.Done(context.Background(), msg); err != nil {
+				t.Fatalf("RDB.Done failed: %v", err)
+			}
+			finishedCh <- msg
+		}
+		// Wait for heartbeater to write to redis
 		time.Sleep(tc.interval * 2)
 
-		want.Status = "closed"
+		for qname, wantLease := range tc.wantLease2 {
+			gotLease := h.GetLeaseEntries(t, r, qname)
+			if diff := cmp.Diff(wantLease, gotLease, h.SortZSetEntryOpt); diff != "" {
+				t.Errorf("%s: mismatch found in %q: (-want,+got):\n%s", tc.desc, base.LeaseKey(qname), diff)
+			}
+		}
+
+		//===================
+		// Start Phase3
+		//===================
+
+		// Server state change; simulating Server.Shutdown
+		srvState.mu.Lock()
+		srvState.value = srvStateClosed
+		srvState.mu.Unlock()
+
+		// Wait for heartbeater to write to redis
+		time.Sleep(tc.interval * 2)
+
+		wantInfo = &base.ServerInfo{
+			Host:              tc.host,
+			PID:               tc.pid,
+			Queues:            tc.queues,
+			Concurrency:       tc.concurrency,
+			Started:           now,
+			Status:            "closed",
+			ActiveWorkerCount: len(tc.startedWorkers) - len(tc.finishedTasks),
+		}
 		ss, err = rdbClient.ListServers()
 		if err != nil {
-			t.Errorf("could not read process status from redis: %v", err)
+			t.Errorf("%s: could not read server status from redis: %v", tc.desc, err)
 			hb.shutdown()
 			continue
 		}
 
 		if len(ss) != 1 {
-			t.Errorf("(*RDB).ListProcesses returned %d process info, want 1", len(ss))
+			t.Errorf("%s: (*RDB).ListServers returned %d server info, want 1", tc.desc, len(ss))
 			hb.shutdown()
 			continue
 		}
 
-		if diff := cmp.Diff(want, ss[0], timeCmpOpt, ignoreOpt, ignoreFieldOpt); diff != "" {
-			t.Errorf("redis stored process status %+v, want %+v; (-want, +got)\n%s", ss[0], want, diff)
+		if diff := cmp.Diff(wantInfo, ss[0], timeCmpOpt, ignoreOpt, ignoreFieldOpt); diff != "" {
+			t.Errorf("%s: redis stored process status %+v, want %+v; (-want, +got)\n%s", tc.desc, ss[0], wantInfo, diff)
 			hb.shutdown()
 			continue
 		}
@@ -131,8 +323,7 @@ func TestHeartbeaterWithRedisDown(t *testing.T) {
 	r := rdb.NewRDB(setup(t))
 	defer r.Close()
 	testBroker := testbroker.NewTestBroker(r)
-	state := base.NewServerState()
-	state.Set(base.StateActive)
+	state := &serverState{value: srvStateActive}
 	hb := newHeartbeater(heartbeaterParams{
 		logger:         testLogger,
 		broker:         testBroker,

inspector.go

@@ -10,17 +10,19 @@ import (
 	"strings"
 	"time"
 
-	"github.com/go-redis/redis/v7"
-	"github.com/google/uuid"
 	"github.com/hibiken/asynq/internal/base"
 	"github.com/hibiken/asynq/internal/errors"
 	"github.com/hibiken/asynq/internal/rdb"
+	"github.com/redis/go-redis/v9"
 )
 
 // Inspector is a client interface to inspect and mutate the state of
 // queues and tasks.
 type Inspector struct {
 	rdb *rdb.RDB
+	// When an Inspector has been created with an existing Redis connection, we do
+	// not want to close it.
+	sharedConnection bool
 }
 
 // New returns a new instance of Inspector.
@@ -29,13 +31,25 @@ func NewInspector(r RedisConnOpt) *Inspector {
 	if !ok {
 		panic(fmt.Sprintf("inspeq: unsupported RedisConnOpt type %T", r))
 	}
+	inspector := NewInspectorFromRedisClient(c)
+	inspector.sharedConnection = false
+	return inspector
+}
+
+// NewInspectorFromRedisClient returns a new instance of Inspector given a redis.UniversalClient
+// Warning: The underlying redis connection pool will not be closed by Asynq, you are responsible for closing it.
+func NewInspectorFromRedisClient(c redis.UniversalClient) *Inspector {
 	return &Inspector{
-		rdb: rdb.NewRDB(c),
+		rdb:              rdb.NewRDB(c),
+		sharedConnection: true,
 	}
 }
 
 // Close closes the connection with redis.
 func (i *Inspector) Close() error {
+	if i.sharedConnection {
+		return fmt.Errorf("redis connection is shared so the Inspector can't be closed through asynq")
+	}
 	return i.rdb.Close()
 }
 
@@ -44,7 +58,32 @@ func (i *Inspector) Queues() ([]string, error) {
 	return i.rdb.AllQueues()
 }
 
-// QueueInfo represents a state of queues at a certain time.
+// Groups returns a list of all groups within the given queue.
+func (i *Inspector) Groups(queue string) ([]*GroupInfo, error) {
+	stats, err := i.rdb.GroupStats(queue)
+	if err != nil {
+		return nil, err
+	}
+	var res []*GroupInfo
+	for _, s := range stats {
+		res = append(res, &GroupInfo{
+			Group: s.Group,
+			Size:  s.Size,
+		})
+	}
+	return res, nil
+}
+
+// GroupInfo represents a state of a group at a certain time.
+type GroupInfo struct {
+	// Name of the group.
+	Group string
+
+	// Size is the total number of tasks in the group.
+	Size int
+}
+
+// QueueInfo represents a state of a queue at a certain time.
 type QueueInfo struct {
 	// Name of the queue.
 	Queue string
@@ -53,10 +92,16 @@ type QueueInfo struct {
 	// It is an approximate memory usage value in bytes since the value is computed by sampling.
 	MemoryUsage int64
 
+	// Latency of the queue, measured by the oldest pending task in the queue.
+	Latency time.Duration
+
 	// Size is the total number of tasks in the queue.
-	// The value is the sum of Pending, Active, Scheduled, Retry, and Archived.
+	// The value is the sum of Pending, Active, Scheduled, Retry, Aggregating and Archived.
 	Size int
 
+	// Groups is the total number of groups in the queue.
+	Groups int
+
 	// Number of pending tasks.
 	Pending int
 	// Number of active tasks.
@@ -67,13 +112,22 @@ type QueueInfo struct {
 	Retry int
 	// Number of archived tasks.
 	Archived int
+	// Number of stored completed tasks.
+	Completed int
+	// Number of aggregating tasks.
+	Aggregating int
 
-	// Total number of tasks being processed during the given date.
+	// Total number of tasks being processed within the given date (counter resets daily).
 	// The number includes both succeeded and failed tasks.
 	Processed int
-	// Total number of tasks failed to be processed during the given date.
+	// Total number of tasks failed to be processed within the given date (counter resets daily).
 	Failed int
 
+	// Total number of tasks processed (cumulative).
+	ProcessedTotal int
+	// Total number of tasks failed (cumulative).
+	FailedTotal int
+
 	// Paused indicates whether the queue is paused.
 	// If true, tasks in the queue will not be processed.
 	Paused bool
@@ -83,27 +137,33 @@ type QueueInfo struct {
 }
 
 // GetQueueInfo returns current information of the given queue.
-func (i *Inspector) GetQueueInfo(qname string) (*QueueInfo, error) {
-	if err := base.ValidateQueueName(qname); err != nil {
+func (i *Inspector) GetQueueInfo(queue string) (*QueueInfo, error) {
+	if err := base.ValidateQueueName(queue); err != nil {
 		return nil, err
 	}
-	stats, err := i.rdb.CurrentStats(qname)
+	stats, err := i.rdb.CurrentStats(queue)
 	if err != nil {
 		return nil, err
 	}
 	return &QueueInfo{
-		Queue:       stats.Queue,
-		MemoryUsage: stats.MemoryUsage,
-		Size:        stats.Size,
-		Pending:     stats.Pending,
-		Active:      stats.Active,
-		Scheduled:   stats.Scheduled,
-		Retry:       stats.Retry,
-		Archived:    stats.Archived,
-		Processed:   stats.Processed,
-		Failed:      stats.Failed,
-		Paused:      stats.Paused,
-		Timestamp:   stats.Timestamp,
+		Queue:          stats.Queue,
+		MemoryUsage:    stats.MemoryUsage,
+		Latency:        stats.Latency,
+		Size:           stats.Size,
+		Groups:         stats.Groups,
+		Pending:        stats.Pending,
+		Active:         stats.Active,
+		Scheduled:      stats.Scheduled,
+		Retry:          stats.Retry,
+		Archived:       stats.Archived,
+		Completed:      stats.Completed,
+		Aggregating:    stats.Aggregating,
+		Processed:      stats.Processed,
+		Failed:         stats.Failed,
+		ProcessedTotal: stats.ProcessedTotal,
+		FailedTotal:    stats.FailedTotal,
+		Paused:         stats.Paused,
+		Timestamp:      stats.Timestamp,
 	}, nil
 }
 
@@ -121,11 +181,11 @@ type DailyStats struct {
 }
 
 // History returns a list of stats from the last n days.
-func (i *Inspector) History(qname string, n int) ([]*DailyStats, error) {
-	if err := base.ValidateQueueName(qname); err != nil {
+func (i *Inspector) History(queue string, n int) ([]*DailyStats, error) {
+	if err := base.ValidateQueueName(queue); err != nil {
 		return nil, err
 	}
-	stats, err := i.rdb.HistoricalStats(qname, n)
+	stats, err := i.rdb.HistoricalStats(queue, n)
 	if err != nil {
 		return nil, err
 	}
@@ -162,27 +222,23 @@ var (
 // If the specified queue does not exist, DeleteQueue returns ErrQueueNotFound.
 // If force is set to false and the specified queue is not empty, DeleteQueue
 // returns ErrQueueNotEmpty.
-func (i *Inspector) DeleteQueue(qname string, force bool) error {
-	err := i.rdb.RemoveQueue(qname, force)
+func (i *Inspector) DeleteQueue(queue string, force bool) error {
+	err := i.rdb.RemoveQueue(queue, force)
 	if errors.IsQueueNotFound(err) {
-		return fmt.Errorf("%w: queue=%q", ErrQueueNotFound, qname)
+		return fmt.Errorf("%w: queue=%q", ErrQueueNotFound, queue)
 	}
 	if errors.IsQueueNotEmpty(err) {
-		return fmt.Errorf("%w: queue=%q", ErrQueueNotEmpty, qname)
+		return fmt.Errorf("%w: queue=%q", ErrQueueNotEmpty, queue)
 	}
 	return err
 }
 
 // GetTaskInfo retrieves task information given a task id and queue name.
 //
-// Returns ErrQueueNotFound if a queue with the given name doesn't exist.
-// Returns ErrTaskNotFound if a task with the given id doesn't exist in the queue.
-func (i *Inspector) GetTaskInfo(qname, id string) (*TaskInfo, error) {
-	taskid, err := uuid.Parse(id)
-	if err != nil {
-		return nil, fmt.Errorf("asynq: %s is not a valid task id", id)
-	}
-	info, err := i.rdb.GetTaskInfo(qname, taskid)
+// Returns an error wrapping ErrQueueNotFound if a queue with the given name doesn't exist.
+// Returns an error wrapping ErrTaskNotFound if a task with the given id doesn't exist in the queue.
+func (i *Inspector) GetTaskInfo(queue, id string) (*TaskInfo, error) {
+	info, err := i.rdb.GetTaskInfo(queue, id)
 	switch {
 	case errors.IsQueueNotFound(err):
 		return nil, fmt.Errorf("asynq: %w", ErrQueueNotFound)
@@ -191,7 +247,7 @@ func (i *Inspector) GetTaskInfo(qname, id string) (*TaskInfo, error) {
 	case err != nil:
 		return nil, fmt.Errorf("asynq: %v", err)
 	}
-	return newTaskInfo(info.Message, info.State, info.NextProcessAt), nil
+	return newTaskInfo(info.Message, info.State, info.NextProcessAt, info.Result), nil
 }
 
 // ListOption specifies behavior of list operation.
@@ -258,23 +314,27 @@ func Page(n int) ListOption {
 // ListPendingTasks retrieves pending tasks from the specified queue.
 //
 // By default, it retrieves the first 30 tasks.
-func (i *Inspector) ListPendingTasks(qname string, opts ...ListOption) ([]*TaskInfo, error) {
-	if err := base.ValidateQueueName(qname); err != nil {
+func (i *Inspector) ListPendingTasks(queue string, opts ...ListOption) ([]*TaskInfo, error) {
+	if err := base.ValidateQueueName(queue); err != nil {
 		return nil, fmt.Errorf("asynq: %v", err)
 	}
 	opt := composeListOptions(opts...)
 	pgn := rdb.Pagination{Size: opt.pageSize, Page: opt.pageNum - 1}
-	msgs, err := i.rdb.ListPending(qname, pgn)
+	infos, err := i.rdb.ListPending(queue, pgn)
 	switch {
 	case errors.IsQueueNotFound(err):
 		return nil, fmt.Errorf("asynq: %w", ErrQueueNotFound)
 	case err != nil:
 		return nil, fmt.Errorf("asynq: %v", err)
 	}
-	now := time.Now()
 	var tasks []*TaskInfo
-	for _, m := range msgs {
-		tasks = append(tasks, newTaskInfo(m, base.TaskStatePending, now))
+	for _, i := range infos {
+		tasks = append(tasks, newTaskInfo(
+			i.Message,
+			i.State,
+			i.NextProcessAt,
+			i.Result,
+		))
 	}
 	return tasks, err
 }
@@ -282,13 +342,53 @@ func (i *Inspector) ListPendingTasks(qname string, opts ...ListOption) ([]*TaskI
 // ListActiveTasks retrieves active tasks from the specified queue.
 //
 // By default, it retrieves the first 30 tasks.
-func (i *Inspector) ListActiveTasks(qname string, opts ...ListOption) ([]*TaskInfo, error) {
-	if err := base.ValidateQueueName(qname); err != nil {
+func (i *Inspector) ListActiveTasks(queue string, opts ...ListOption) ([]*TaskInfo, error) {
+	if err := base.ValidateQueueName(queue); err != nil {
 		return nil, fmt.Errorf("asynq: %v", err)
 	}
 	opt := composeListOptions(opts...)
 	pgn := rdb.Pagination{Size: opt.pageSize, Page: opt.pageNum - 1}
-	msgs, err := i.rdb.ListActive(qname, pgn)
+	infos, err := i.rdb.ListActive(queue, pgn)
+	switch {
+	case errors.IsQueueNotFound(err):
+		return nil, fmt.Errorf("asynq: %w", ErrQueueNotFound)
+	case err != nil:
+		return nil, fmt.Errorf("asynq: %v", err)
+	}
+	expired, err := i.rdb.ListLeaseExpired(time.Now(), queue)
+	if err != nil {
+		return nil, fmt.Errorf("asynq: %v", err)
+	}
+	expiredSet := make(map[string]struct{}) // set of expired message IDs
+	for _, msg := range expired {
+		expiredSet[msg.ID] = struct{}{}
+	}
+	var tasks []*TaskInfo
+	for _, i := range infos {
+		t := newTaskInfo(
+			i.Message,
+			i.State,
+			i.NextProcessAt,
+			i.Result,
+		)
+		if _, ok := expiredSet[i.Message.ID]; ok {
+			t.IsOrphaned = true
+		}
+		tasks = append(tasks, t)
+	}
+	return tasks, nil
+}
+
+// ListAggregatingTasks retrieves scheduled tasks from the specified group.
+//
+// By default, it retrieves the first 30 tasks.
+func (i *Inspector) ListAggregatingTasks(queue, group string, opts ...ListOption) ([]*TaskInfo, error) {
+	if err := base.ValidateQueueName(queue); err != nil {
+		return nil, fmt.Errorf("asynq: %v", err)
+	}
+	opt := composeListOptions(opts...)
+	pgn := rdb.Pagination{Size: opt.pageSize, Page: opt.pageNum - 1}
+	infos, err := i.rdb.ListAggregating(queue, group, pgn)
 	switch {
 	case errors.IsQueueNotFound(err):
 		return nil, fmt.Errorf("asynq: %w", ErrQueueNotFound)
@@ -296,23 +396,28 @@ func (i *Inspector) ListActiveTasks(qname string, opts ...ListOption) ([]*TaskIn
 		return nil, fmt.Errorf("asynq: %v", err)
 	}
 	var tasks []*TaskInfo
-	for _, m := range msgs {
-		tasks = append(tasks, newTaskInfo(m, base.TaskStateActive, time.Time{}))
+	for _, i := range infos {
+		tasks = append(tasks, newTaskInfo(
+			i.Message,
+			i.State,
+			i.NextProcessAt,
+			i.Result,
+		))
 	}
-	return tasks, err
+	return tasks, nil
 }
 
 // ListScheduledTasks retrieves scheduled tasks from the specified queue.
 // Tasks are sorted by NextProcessAt in ascending order.
 //
 // By default, it retrieves the first 30 tasks.
-func (i *Inspector) ListScheduledTasks(qname string, opts ...ListOption) ([]*TaskInfo, error) {
-	if err := base.ValidateQueueName(qname); err != nil {
+func (i *Inspector) ListScheduledTasks(queue string, opts ...ListOption) ([]*TaskInfo, error) {
+	if err := base.ValidateQueueName(queue); err != nil {
 		return nil, fmt.Errorf("asynq: %v", err)
 	}
 	opt := composeListOptions(opts...)
 	pgn := rdb.Pagination{Size: opt.pageSize, Page: opt.pageNum - 1}
-	zs, err := i.rdb.ListScheduled(qname, pgn)
+	infos, err := i.rdb.ListScheduled(queue, pgn)
 	switch {
 	case errors.IsQueueNotFound(err):
 		return nil, fmt.Errorf("asynq: %w", ErrQueueNotFound)
@@ -320,11 +425,12 @@ func (i *Inspector) ListScheduledTasks(qname string, opts ...ListOption) ([]*Tas
 		return nil, fmt.Errorf("asynq: %v", err)
 	}
 	var tasks []*TaskInfo
-	for _, z := range zs {
+	for _, i := range infos {
 		tasks = append(tasks, newTaskInfo(
-			z.Message,
-			base.TaskStateScheduled,
-			time.Unix(z.Score, 0),
+			i.Message,
+			i.State,
+			i.NextProcessAt,
+			i.Result,
 		))
 	}
 	return tasks, nil
@@ -334,13 +440,13 @@ func (i *Inspector) ListScheduledTasks(qname string, opts ...ListOption) ([]*Tas
 // Tasks are sorted by NextProcessAt in ascending order.
 //
 // By default, it retrieves the first 30 tasks.
-func (i *Inspector) ListRetryTasks(qname string, opts ...ListOption) ([]*TaskInfo, error) {
-	if err := base.ValidateQueueName(qname); err != nil {
+func (i *Inspector) ListRetryTasks(queue string, opts ...ListOption) ([]*TaskInfo, error) {
+	if err := base.ValidateQueueName(queue); err != nil {
 		return nil, fmt.Errorf("asynq: %v", err)
 	}
 	opt := composeListOptions(opts...)
 	pgn := rdb.Pagination{Size: opt.pageSize, Page: opt.pageNum - 1}
-	zs, err := i.rdb.ListRetry(qname, pgn)
+	infos, err := i.rdb.ListRetry(queue, pgn)
 	switch {
 	case errors.IsQueueNotFound(err):
 		return nil, fmt.Errorf("asynq: %w", ErrQueueNotFound)
@@ -348,11 +454,12 @@ func (i *Inspector) ListRetryTasks(qname string, opts ...ListOption) ([]*TaskInf
 		return nil, fmt.Errorf("asynq: %v", err)
 	}
 	var tasks []*TaskInfo
-	for _, z := range zs {
+	for _, i := range infos {
 		tasks = append(tasks, newTaskInfo(
-			z.Message,
-			base.TaskStateRetry,
-			time.Unix(z.Score, 0),
+			i.Message,
+			i.State,
+			i.NextProcessAt,
+			i.Result,
 		))
 	}
 	return tasks, nil
@@ -362,13 +469,13 @@ func (i *Inspector) ListRetryTasks(qname string, opts ...ListOption) ([]*TaskInf
 // Tasks are sorted by LastFailedAt in descending order.
 //
 // By default, it retrieves the first 30 tasks.
-func (i *Inspector) ListArchivedTasks(qname string, opts ...ListOption) ([]*TaskInfo, error) {
-	if err := base.ValidateQueueName(qname); err != nil {
+func (i *Inspector) ListArchivedTasks(queue string, opts ...ListOption) ([]*TaskInfo, error) {
+	if err := base.ValidateQueueName(queue); err != nil {
 		return nil, fmt.Errorf("asynq: %v", err)
 	}
 	opt := composeListOptions(opts...)
 	pgn := rdb.Pagination{Size: opt.pageSize, Page: opt.pageNum - 1}
-	zs, err := i.rdb.ListArchived(qname, pgn)
+	infos, err := i.rdb.ListArchived(queue, pgn)
 	switch {
 	case errors.IsQueueNotFound(err):
 		return nil, fmt.Errorf("asynq: %w", ErrQueueNotFound)
@@ -376,11 +483,41 @@ func (i *Inspector) ListArchivedTasks(qname string, opts ...ListOption) ([]*Task
 		return nil, fmt.Errorf("asynq: %v", err)
 	}
 	var tasks []*TaskInfo
-	for _, z := range zs {
+	for _, i := range infos {
 		tasks = append(tasks, newTaskInfo(
-			z.Message,
-			base.TaskStateArchived,
-			time.Time{},
+			i.Message,
+			i.State,
+			i.NextProcessAt,
+			i.Result,
+		))
+	}
+	return tasks, nil
+}
+
+// ListCompletedTasks retrieves completed tasks from the specified queue.
+// Tasks are sorted by expiration time (i.e. CompletedAt + Retention) in descending order.
+//
+// By default, it retrieves the first 30 tasks.
+func (i *Inspector) ListCompletedTasks(queue string, opts ...ListOption) ([]*TaskInfo, error) {
+	if err := base.ValidateQueueName(queue); err != nil {
+		return nil, fmt.Errorf("asynq: %v", err)
+	}
+	opt := composeListOptions(opts...)
+	pgn := rdb.Pagination{Size: opt.pageSize, Page: opt.pageNum - 1}
+	infos, err := i.rdb.ListCompleted(queue, pgn)
+	switch {
+	case errors.IsQueueNotFound(err):
+		return nil, fmt.Errorf("asynq: %w", ErrQueueNotFound)
+	case err != nil:
+		return nil, fmt.Errorf("asynq: %v", err)
+	}
+	var tasks []*TaskInfo
+	for _, i := range infos {
+		tasks = append(tasks, newTaskInfo(
+			i.Message,
+			i.State,
+			i.NextProcessAt,
+			i.Result,
 		))
 	}
 	return tasks, nil
@@ -388,41 +525,61 @@ func (i *Inspector) ListArchivedTasks(qname string, opts ...ListOption) ([]*Task
 
 // DeleteAllPendingTasks deletes all pending tasks from the specified queue,
 // and reports the number tasks deleted.
-func (i *Inspector) DeleteAllPendingTasks(qname string) (int, error) {
-	if err := base.ValidateQueueName(qname); err != nil {
+func (i *Inspector) DeleteAllPendingTasks(queue string) (int, error) {
+	if err := base.ValidateQueueName(queue); err != nil {
 		return 0, err
 	}
-	n, err := i.rdb.DeleteAllPendingTasks(qname)
+	n, err := i.rdb.DeleteAllPendingTasks(queue)
 	return int(n), err
 }
 
 // DeleteAllScheduledTasks deletes all scheduled tasks from the specified queue,
 // and reports the number tasks deleted.
-func (i *Inspector) DeleteAllScheduledTasks(qname string) (int, error) {
-	if err := base.ValidateQueueName(qname); err != nil {
+func (i *Inspector) DeleteAllScheduledTasks(queue string) (int, error) {
+	if err := base.ValidateQueueName(queue); err != nil {
 		return 0, err
 	}
-	n, err := i.rdb.DeleteAllScheduledTasks(qname)
+	n, err := i.rdb.DeleteAllScheduledTasks(queue)
 	return int(n), err
 }
 
 // DeleteAllRetryTasks deletes all retry tasks from the specified queue,
 // and reports the number tasks deleted.
-func (i *Inspector) DeleteAllRetryTasks(qname string) (int, error) {
-	if err := base.ValidateQueueName(qname); err != nil {
+func (i *Inspector) DeleteAllRetryTasks(queue string) (int, error) {
+	if err := base.ValidateQueueName(queue); err != nil {
 		return 0, err
 	}
-	n, err := i.rdb.DeleteAllRetryTasks(qname)
+	n, err := i.rdb.DeleteAllRetryTasks(queue)
 	return int(n), err
 }
 
 // DeleteAllArchivedTasks deletes all archived tasks from the specified queue,
 // and reports the number tasks deleted.
-func (i *Inspector) DeleteAllArchivedTasks(qname string) (int, error) {
-	if err := base.ValidateQueueName(qname); err != nil {
+func (i *Inspector) DeleteAllArchivedTasks(queue string) (int, error) {
+	if err := base.ValidateQueueName(queue); err != nil {
 		return 0, err
 	}
-	n, err := i.rdb.DeleteAllArchivedTasks(qname)
+	n, err := i.rdb.DeleteAllArchivedTasks(queue)
+	return int(n), err
+}
+
+// DeleteAllCompletedTasks deletes all completed tasks from the specified queue,
+// and reports the number tasks deleted.
+func (i *Inspector) DeleteAllCompletedTasks(queue string) (int, error) {
+	if err := base.ValidateQueueName(queue); err != nil {
+		return 0, err
+	}
+	n, err := i.rdb.DeleteAllCompletedTasks(queue)
+	return int(n), err
+}
+
+// DeleteAllAggregatingTasks deletes all tasks from the specified group,
+// and reports the number of tasks deleted.
+func (i *Inspector) DeleteAllAggregatingTasks(queue, group string) (int, error) {
+	if err := base.ValidateQueueName(queue); err != nil {
+		return 0, err
+	}
+	n, err := i.rdb.DeleteAllAggregatingTasks(queue, group)
 	return int(n), err
 }
 
@@ -430,18 +587,14 @@ func (i *Inspector) DeleteAllArchivedTasks(qname string) (int, error) {
 // The task needs to be in pending, scheduled, retry, or archived state,
 // otherwise DeleteTask will return an error.
 //
-// If a queue with the given name doesn't exist, it returns ErrQueueNotFound.
-// If a task with the given id doesn't exist in the queue, it returns ErrTaskNotFound.
+// If a queue with the given name doesn't exist, it returns an error wrapping ErrQueueNotFound.
+// If a task with the given id doesn't exist in the queue, it returns an error wrapping ErrTaskNotFound.
 // If the task is in active state, it returns a non-nil error.
-func (i *Inspector) DeleteTask(qname, id string) error {
-	if err := base.ValidateQueueName(qname); err != nil {
+func (i *Inspector) DeleteTask(queue, id string) error {
+	if err := base.ValidateQueueName(queue); err != nil {
 		return fmt.Errorf("asynq: %v", err)
 	}
-	taskid, err := uuid.Parse(id)
-	if err != nil {
-		return fmt.Errorf("asynq: %s is not a valid task id", id)
-	}
-	err = i.rdb.DeleteTask(qname, taskid)
+	err := i.rdb.DeleteTask(queue, id)
 	switch {
 	case errors.IsQueueNotFound(err):
 		return fmt.Errorf("asynq: %w", ErrQueueNotFound)
@@ -454,33 +607,43 @@ func (i *Inspector) DeleteTask(qname, id string) error {
 
 }
 
-// RunAllScheduledTasks transition all scheduled tasks to pending state from the given queue,
-// and reports the number of tasks transitioned.
-func (i *Inspector) RunAllScheduledTasks(qname string) (int, error) {
-	if err := base.ValidateQueueName(qname); err != nil {
+// RunAllScheduledTasks schedules all scheduled tasks from the given queue to run,
+// and reports the number of tasks scheduled to run.
+func (i *Inspector) RunAllScheduledTasks(queue string) (int, error) {
+	if err := base.ValidateQueueName(queue); err != nil {
 		return 0, err
 	}
-	n, err := i.rdb.RunAllScheduledTasks(qname)
+	n, err := i.rdb.RunAllScheduledTasks(queue)
 	return int(n), err
 }
 
-// RunAllRetryTasks transition all retry tasks to pending state from the given queue,
-// and reports the number of tasks transitioned.
-func (i *Inspector) RunAllRetryTasks(qname string) (int, error) {
-	if err := base.ValidateQueueName(qname); err != nil {
+// RunAllRetryTasks schedules all retry tasks from the given queue to run,
+// and reports the number of tasks scheduled to run.
+func (i *Inspector) RunAllRetryTasks(queue string) (int, error) {
+	if err := base.ValidateQueueName(queue); err != nil {
 		return 0, err
 	}
-	n, err := i.rdb.RunAllRetryTasks(qname)
+	n, err := i.rdb.RunAllRetryTasks(queue)
 	return int(n), err
 }
 
-// RunAllArchivedTasks transition all archived tasks to pending state from the given queue,
-// and reports the number of tasks transitioned.
-func (i *Inspector) RunAllArchivedTasks(qname string) (int, error) {
-	if err := base.ValidateQueueName(qname); err != nil {
+// RunAllArchivedTasks schedules all archived tasks from the given queue to run,
+// and reports the number of tasks scheduled to run.
+func (i *Inspector) RunAllArchivedTasks(queue string) (int, error) {
+	if err := base.ValidateQueueName(queue); err != nil {
 		return 0, err
 	}
-	n, err := i.rdb.RunAllArchivedTasks(qname)
+	n, err := i.rdb.RunAllArchivedTasks(queue)
+	return int(n), err
+}
+
+// RunAllAggregatingTasks schedules all tasks from the given grou to run.
+// and reports the number of tasks scheduled to run.
+func (i *Inspector) RunAllAggregatingTasks(queue, group string) (int, error) {
+	if err := base.ValidateQueueName(queue); err != nil {
+		return 0, err
+	}
+	n, err := i.rdb.RunAllAggregatingTasks(queue, group)
 	return int(n), err
 }
 
@@ -488,18 +651,14 @@ func (i *Inspector) RunAllArchivedTasks(qname string) (int, error) {
 // The task needs to be in scheduled, retry, or archived state, otherwise RunTask
 // will return an error.
 //
-// If a queue with the given name doesn't exist, it returns ErrQueueNotFound.
-// If a task with the given id doesn't exist in the queue, it returns ErrTaskNotFound.
+// If a queue with the given name doesn't exist, it returns an error wrapping ErrQueueNotFound.
+// If a task with the given id doesn't exist in the queue, it returns an error wrapping ErrTaskNotFound.
 // If the task is in pending or active state, it returns a non-nil error.
-func (i *Inspector) RunTask(qname, id string) error {
-	if err := base.ValidateQueueName(qname); err != nil {
+func (i *Inspector) RunTask(queue, id string) error {
+	if err := base.ValidateQueueName(queue); err != nil {
 		return fmt.Errorf("asynq: %v", err)
 	}
-	taskid, err := uuid.Parse(id)
-	if err != nil {
-		return fmt.Errorf("asynq: %s is not a valid task id", id)
-	}
-	err = i.rdb.RunTask(qname, taskid)
+	err := i.rdb.RunTask(queue, id)
 	switch {
 	case errors.IsQueueNotFound(err):
 		return fmt.Errorf("asynq: %w", ErrQueueNotFound)
@@ -513,31 +672,41 @@ func (i *Inspector) RunTask(qname, id string) error {
 
 // ArchiveAllPendingTasks archives all pending tasks from the given queue,
 // and reports the number of tasks archived.
-func (i *Inspector) ArchiveAllPendingTasks(qname string) (int, error) {
-	if err := base.ValidateQueueName(qname); err != nil {
+func (i *Inspector) ArchiveAllPendingTasks(queue string) (int, error) {
+	if err := base.ValidateQueueName(queue); err != nil {
 		return 0, err
 	}
-	n, err := i.rdb.ArchiveAllPendingTasks(qname)
+	n, err := i.rdb.ArchiveAllPendingTasks(queue)
 	return int(n), err
 }
 
 // ArchiveAllScheduledTasks archives all scheduled tasks from the given queue,
 // and reports the number of tasks archiveed.
-func (i *Inspector) ArchiveAllScheduledTasks(qname string) (int, error) {
-	if err := base.ValidateQueueName(qname); err != nil {
+func (i *Inspector) ArchiveAllScheduledTasks(queue string) (int, error) {
+	if err := base.ValidateQueueName(queue); err != nil {
 		return 0, err
 	}
-	n, err := i.rdb.ArchiveAllScheduledTasks(qname)
+	n, err := i.rdb.ArchiveAllScheduledTasks(queue)
 	return int(n), err
 }
 
 // ArchiveAllRetryTasks archives all retry tasks from the given queue,
 // and reports the number of tasks archiveed.
-func (i *Inspector) ArchiveAllRetryTasks(qname string) (int, error) {
-	if err := base.ValidateQueueName(qname); err != nil {
+func (i *Inspector) ArchiveAllRetryTasks(queue string) (int, error) {
+	if err := base.ValidateQueueName(queue); err != nil {
 		return 0, err
 	}
-	n, err := i.rdb.ArchiveAllRetryTasks(qname)
+	n, err := i.rdb.ArchiveAllRetryTasks(queue)
+	return int(n), err
+}
+
+// ArchiveAllAggregatingTasks archives all tasks from the given group,
+// and reports the number of tasks archived.
+func (i *Inspector) ArchiveAllAggregatingTasks(queue, group string) (int, error) {
+	if err := base.ValidateQueueName(queue); err != nil {
+		return 0, err
+	}
+	n, err := i.rdb.ArchiveAllAggregatingTasks(queue, group)
 	return int(n), err
 }
 
@@ -545,18 +714,14 @@ func (i *Inspector) ArchiveAllRetryTasks(qname string) (int, error) {
 // The task needs to be in pending, scheduled, or retry state, otherwise ArchiveTask
 // will return an error.
 //
-// If a queue with the given name doesn't exist, it returns ErrQueueNotFound.
-// If a task with the given id doesn't exist in the queue, it returns ErrTaskNotFound.
+// If a queue with the given name doesn't exist, it returns an error wrapping ErrQueueNotFound.
+// If a task with the given id doesn't exist in the queue, it returns an error wrapping ErrTaskNotFound.
 // If the task is in already archived, it returns a non-nil error.
-func (i *Inspector) ArchiveTask(qname, id string) error {
-	if err := base.ValidateQueueName(qname); err != nil {
+func (i *Inspector) ArchiveTask(queue, id string) error {
+	if err := base.ValidateQueueName(queue); err != nil {
 		return fmt.Errorf("asynq: err")
 	}
-	taskid, err := uuid.Parse(id)
-	if err != nil {
-		return fmt.Errorf("asynq: %s is not a valid task id", id)
-	}
-	err = i.rdb.ArchiveTask(qname, taskid)
+	err := i.rdb.ArchiveTask(queue, id)
 	switch {
 	case errors.IsQueueNotFound(err):
 		return fmt.Errorf("asynq: %w", ErrQueueNotFound)
@@ -578,20 +743,20 @@ func (i *Inspector) CancelProcessing(id string) error {
 
 // PauseQueue pauses task processing on the specified queue.
 // If the queue is already paused, it will return a non-nil error.
-func (i *Inspector) PauseQueue(qname string) error {
-	if err := base.ValidateQueueName(qname); err != nil {
+func (i *Inspector) PauseQueue(queue string) error {
+	if err := base.ValidateQueueName(queue); err != nil {
 		return err
 	}
-	return i.rdb.Pause(qname)
+	return i.rdb.Pause(queue)
 }
 
 // UnpauseQueue resumes task processing on the specified queue.
 // If the queue is not paused, it will return a non-nil error.
-func (i *Inspector) UnpauseQueue(qname string) error {
-	if err := base.ValidateQueueName(qname); err != nil {
+func (i *Inspector) UnpauseQueue(queue string) error {
+	if err := base.ValidateQueueName(queue); err != nil {
 		return err
 	}
-	return i.rdb.Unpause(qname)
+	return i.rdb.Unpause(queue)
 }
 
 // Servers return a list of running servers' information.
@@ -681,8 +846,8 @@ type WorkerInfo struct {
 }
 
 // ClusterKeySlot returns an integer identifying the hash slot the given queue hashes to.
-func (i *Inspector) ClusterKeySlot(qname string) (int64, error) {
-	return i.rdb.ClusterKeySlot(qname)
+func (i *Inspector) ClusterKeySlot(queue string) (int64, error) {
+	return i.rdb.ClusterKeySlot(queue)
 }
 
 // ClusterNode describes a node in redis cluster.
@@ -697,8 +862,8 @@ type ClusterNode struct {
 // ClusterNodes returns a list of nodes the given queue belongs to.
 //
 // Only relevant if task queues are stored in redis cluster.
-func (i *Inspector) ClusterNodes(qname string) ([]*ClusterNode, error) {
-	nodes, err := i.rdb.ClusterNodes(qname)
+func (i *Inspector) ClusterNodes(queue string) ([]*ClusterNode, error) {
+	nodes, err := i.rdb.ClusterNodes(queue)
 	if err != nil {
 		return nil, err
 	}
@@ -766,11 +931,11 @@ func parseOption(s string) (Option, error) {
 	fn, arg := parseOptionFunc(s), parseOptionArg(s)
 	switch fn {
 	case "Queue":
-		qname, err := strconv.Unquote(arg)
+		queue, err := strconv.Unquote(arg)
 		if err != nil {
 			return nil, err
 		}
-		return Queue(qname), nil
+		return Queue(queue), nil
 	case "MaxRetry":
 		n, err := strconv.Atoi(arg)
 		if err != nil {
@@ -807,6 +972,12 @@ func parseOption(s string) (Option, error) {
 			return nil, err
 		}
 		return ProcessIn(d), nil
+	case "Retention":
+		d, err := time.ParseDuration(arg)
+		if err != nil {
+			return nil, err
+		}
+		return Retention(d), nil
 	default:
 		return nil, fmt.Errorf("cannot not parse option string %q", s)
 	}

inspector_test.go

@@ -5,9 +5,9 @@
 package asynq
 
 import (
+	"context"
 	"errors"
 	"fmt"
-	"math"
 	"sort"
 	"testing"
 	"time"
@@ -15,16 +15,14 @@ import (
 	"github.com/google/go-cmp/cmp"
 	"github.com/google/go-cmp/cmp/cmpopts"
 	"github.com/google/uuid"
-	h "github.com/hibiken/asynq/internal/asynqtest"
 	"github.com/hibiken/asynq/internal/base"
 	"github.com/hibiken/asynq/internal/rdb"
+	h "github.com/hibiken/asynq/internal/testutil"
+	"github.com/hibiken/asynq/internal/timeutil"
+	"github.com/redis/go-redis/v9"
 )
 
-func TestInspectorQueues(t *testing.T) {
-	r := setup(t)
-	defer r.Close()
-	inspector := NewInspector(getRedisConnOpt(t))
-
+func testInspectorQueues(t *testing.T, inspector *Inspector, r redis.UniversalClient) {
 	tests := []struct {
 		queues []string
 	}{
@@ -37,7 +35,7 @@ func TestInspectorQueues(t *testing.T) {
 	for _, tc := range tests {
 		h.FlushDB(t, r)
 		for _, qname := range tc.queues {
-			if err := r.SAdd(base.AllQueues, qname).Err(); err != nil {
+			if err := r.SAdd(context.Background(), base.AllQueues, qname).Err(); err != nil {
 				t.Fatalf("could not initialize all queue set: %v", err)
 			}
 		}
@@ -50,7 +48,21 @@ func TestInspectorQueues(t *testing.T) {
 			t.Errorf("Queues() = %v, want %v; (-want, +got)\n%s", got, tc.queues, diff)
 		}
 	}
+}
 
+func TestInspectorQueues(t *testing.T) {
+	r := setup(t)
+	defer r.Close()
+	inspector := NewInspector(getRedisConnOpt(t))
+	testInspectorQueues(t, inspector, r)
+}
+
+func TestInspectorFromRedisClientQueues(t *testing.T) {
+	r := setup(t)
+	defer r.Close()
+	redisClient := getRedisConnOpt(t).MakeRedisClient().(redis.UniversalClient)
+	inspector := NewInspectorFromRedisClient(redisClient)
+	testInspectorQueues(t, inspector, r)
 }
 
 func TestInspectorDeleteQueue(t *testing.T) {
@@ -136,7 +148,7 @@ func TestInspectorDeleteQueue(t *testing.T) {
 				tc.qname, tc.force, err)
 			continue
 		}
-		if r.SIsMember(base.AllQueues, tc.qname).Val() {
+		if r.SIsMember(context.Background(), base.AllQueues, tc.qname).Val() {
 			t.Errorf("%q is a member of %q", tc.qname, base.AllQueues)
 		}
 	}
@@ -268,17 +280,22 @@ func TestInspectorGetQueueInfo(t *testing.T) {
 	ignoreMemUsg := cmpopts.IgnoreFields(QueueInfo{}, "MemoryUsage")
 
 	inspector := NewInspector(getRedisConnOpt(t))
+	inspector.rdb.SetClock(timeutil.NewSimulatedClock(now))
 
 	tests := []struct {
-		pending   map[string][]*base.TaskMessage
-		active    map[string][]*base.TaskMessage
-		scheduled map[string][]base.Z
-		retry     map[string][]base.Z
-		archived  map[string][]base.Z
-		processed map[string]int
-		failed    map[string]int
-		qname     string
-		want      *QueueInfo
+		pending                         map[string][]*base.TaskMessage
+		active                          map[string][]*base.TaskMessage
+		scheduled                       map[string][]base.Z
+		retry                           map[string][]base.Z
+		archived                        map[string][]base.Z
+		completed                       map[string][]base.Z
+		processed                       map[string]int
+		failed                          map[string]int
+		processedTotal                  map[string]int
+		failedTotal                     map[string]int
+		oldestPendingMessageEnqueueTime map[string]time.Time
+		qname                           string
+		want                            *QueueInfo
 	}{
 		{
 			pending: map[string][]*base.TaskMessage{
@@ -309,6 +326,11 @@ func TestInspectorGetQueueInfo(t *testing.T) {
 				"critical": {},
 				"low":      {},
 			},
+			completed: map[string][]base.Z{
+				"default":  {},
+				"critical": {},
+				"low":      {},
+			},
 			processed: map[string]int{
 				"default":  120,
 				"critical": 100,
@@ -319,19 +341,38 @@ func TestInspectorGetQueueInfo(t *testing.T) {
 				"critical": 0,
 				"low":      5,
 			},
+			processedTotal: map[string]int{
+				"default":  11111,
+				"critical": 22222,
+				"low":      33333,
+			},
+			failedTotal: map[string]int{
+				"default":  111,
+				"critical": 222,
+				"low":      333,
+			},
+			oldestPendingMessageEnqueueTime: map[string]time.Time{
+				"default":  now.Add(-15 * time.Second),
+				"critical": now.Add(-200 * time.Millisecond),
+				"low":      now.Add(-30 * time.Second),
+			},
 			qname: "default",
 			want: &QueueInfo{
-				Queue:     "default",
-				Size:      4,
-				Pending:   1,
-				Active:    1,
-				Scheduled: 2,
-				Retry:     0,
-				Archived:  0,
-				Processed: 120,
-				Failed:    2,
-				Paused:    false,
-				Timestamp: now,
+				Queue:          "default",
+				Latency:        15 * time.Second,
+				Size:           4,
+				Pending:        1,
+				Active:         1,
+				Scheduled:      2,
+				Retry:          0,
+				Archived:       0,
+				Completed:      0,
+				Processed:      120,
+				Failed:         2,
+				ProcessedTotal: 11111,
+				FailedTotal:    111,
+				Paused:         false,
+				Timestamp:      now,
 			},
 		},
 	}
@@ -343,13 +384,26 @@ func TestInspectorGetQueueInfo(t *testing.T) {
 		h.SeedAllScheduledQueues(t, r, tc.scheduled)
 		h.SeedAllRetryQueues(t, r, tc.retry)
 		h.SeedAllArchivedQueues(t, r, tc.archived)
+		h.SeedAllCompletedQueues(t, r, tc.completed)
+		ctx := context.Background()
 		for qname, n := range tc.processed {
-			processedKey := base.ProcessedKey(qname, now)
-			r.Set(processedKey, n, 0)
+			r.Set(ctx, base.ProcessedKey(qname, now), n, 0)
 		}
 		for qname, n := range tc.failed {
-			failedKey := base.FailedKey(qname, now)
-			r.Set(failedKey, n, 0)
+			r.Set(ctx, base.FailedKey(qname, now), n, 0)
+		}
+		for qname, n := range tc.processedTotal {
+			r.Set(ctx, base.ProcessedTotalKey(qname), n, 0)
+		}
+		for qname, n := range tc.failedTotal {
+			r.Set(ctx, base.FailedTotalKey(qname), n, 0)
+		}
+		for qname, enqueueTime := range tc.oldestPendingMessageEnqueueTime {
+			if enqueueTime.IsZero() {
+				continue
+			}
+			oldestPendingMessageID := r.LRange(ctx, base.PendingKey(qname), -1, -1).Val()[0] // get the right most msg in the list
+			r.HSet(ctx, base.TaskKey(qname, oldestPendingMessageID), "pending_since", enqueueTime.UnixNano())
 		}
 
 		got, err := inspector.GetQueueInfo(tc.qname)
@@ -385,14 +439,14 @@ func TestInspectorHistory(t *testing.T) {
 	for _, tc := range tests {
 		h.FlushDB(t, r)
 
-		r.SAdd(base.AllQueues, tc.qname)
+		r.SAdd(context.Background(), base.AllQueues, tc.qname)
 		// populate last n days data
 		for i := 0; i < tc.n; i++ {
 			ts := now.Add(-time.Duration(i) * 24 * time.Hour)
 			processedKey := base.ProcessedKey(tc.qname, ts)
 			failedKey := base.FailedKey(tc.qname, ts)
-			r.Set(processedKey, (i+1)*1000, 0)
-			r.Set(failedKey, (i+1)*10, 0)
+			r.Set(context.Background(), processedKey, (i+1)*1000, 0)
+			r.Set(context.Background(), failedKey, (i+1)*10, 0)
 		}
 
 		got, err := inspector.History(tc.qname, tc.n)
@@ -423,7 +477,7 @@ func TestInspectorHistory(t *testing.T) {
 }
 
 func createPendingTask(msg *base.TaskMessage) *TaskInfo {
-	return newTaskInfo(msg, base.TaskStatePending, time.Now())
+	return newTaskInfo(msg, base.TaskStatePending, time.Now(), nil)
 }
 
 func TestInspectorGetTaskInfo(t *testing.T) {
@@ -483,47 +537,52 @@ func TestInspectorGetTaskInfo(t *testing.T) {
 	}{
 		{
 			qname: "default",
-			id:    m1.ID.String(),
+			id:    m1.ID,
 			want: newTaskInfo(
 				m1,
 				base.TaskStateActive,
 				time.Time{}, // zero value for n/a
+				nil,
 			),
 		},
 		{
 			qname: "default",
-			id:    m2.ID.String(),
+			id:    m2.ID,
 			want: newTaskInfo(
 				m2,
 				base.TaskStateScheduled,
 				fiveMinsFromNow,
+				nil,
 			),
 		},
 		{
 			qname: "custom",
-			id:    m3.ID.String(),
+			id:    m3.ID,
 			want: newTaskInfo(
 				m3,
 				base.TaskStateRetry,
 				oneHourFromNow,
+				nil,
 			),
 		},
 		{
 			qname: "custom",
-			id:    m4.ID.String(),
+			id:    m4.ID,
 			want: newTaskInfo(
 				m4,
 				base.TaskStateArchived,
 				time.Time{}, // zero value for n/a
+				nil,
 			),
 		},
 		{
 			qname: "custom",
-			id:    m5.ID.String(),
+			id:    m5.ID,
 			want: newTaskInfo(
 				m5,
 				base.TaskStatePending,
 				now,
+				nil,
 			),
 		},
 	}
@@ -602,7 +661,7 @@ func TestInspectorGetTaskInfoError(t *testing.T) {
 	}{
 		{
 			qname:   "nonexistent",
-			id:      m1.ID.String(),
+			id:      m1.ID,
 			wantErr: ErrQueueNotFound,
 		},
 		{
@@ -697,6 +756,12 @@ func TestInspectorListPendingTasks(t *testing.T) {
 	}
 }
 
+func newOrphanedTaskInfo(msg *base.TaskMessage) *TaskInfo {
+	info := newTaskInfo(msg, base.TaskStateActive, time.Time{}, nil)
+	info.IsOrphaned = true
+	return info
+}
+
 func TestInspectorListActiveTasks(t *testing.T) {
 	r := setup(t)
 	defer r.Close()
@@ -706,10 +771,12 @@ func TestInspectorListActiveTasks(t *testing.T) {
 	m4 := h.NewTaskMessageWithQueue("task4", nil, "custom")
 
 	inspector := NewInspector(getRedisConnOpt(t))
+	now := time.Now()
 
 	tests := []struct {
 		desc   string
 		active map[string][]*base.TaskMessage
+		lease  map[string][]base.Z
 		qname  string
 		want   []*TaskInfo
 	}{
@@ -719,10 +786,42 @@ func TestInspectorListActiveTasks(t *testing.T) {
 				"default": {m1, m2},
 				"custom":  {m3, m4},
 			},
+			lease: map[string][]base.Z{
+				"default": {
+					{Message: m1, Score: now.Add(20 * time.Second).Unix()},
+					{Message: m2, Score: now.Add(20 * time.Second).Unix()},
+				},
+				"custom": {
+					{Message: m3, Score: now.Add(20 * time.Second).Unix()},
+					{Message: m4, Score: now.Add(20 * time.Second).Unix()},
+				},
+			},
+			qname: "custom",
+			want: []*TaskInfo{
+				newTaskInfo(m3, base.TaskStateActive, time.Time{}, nil),
+				newTaskInfo(m4, base.TaskStateActive, time.Time{}, nil),
+			},
+		},
+		{
+			desc: "with an orphaned task",
+			active: map[string][]*base.TaskMessage{
+				"default": {m1, m2},
+				"custom":  {m3, m4},
+			},
+			lease: map[string][]base.Z{
+				"default": {
+					{Message: m1, Score: now.Add(20 * time.Second).Unix()},
+					{Message: m2, Score: now.Add(-10 * time.Second).Unix()}, // orphaned task
+				},
+				"custom": {
+					{Message: m3, Score: now.Add(20 * time.Second).Unix()},
+					{Message: m4, Score: now.Add(20 * time.Second).Unix()},
+				},
+			},
 			qname: "default",
 			want: []*TaskInfo{
-				newTaskInfo(m1, base.TaskStateActive, time.Time{}),
-				newTaskInfo(m2, base.TaskStateActive, time.Time{}),
+				newTaskInfo(m1, base.TaskStateActive, time.Time{}, nil),
+				newOrphanedTaskInfo(m2),
 			},
 		},
 	}
@@ -730,6 +829,7 @@ func TestInspectorListActiveTasks(t *testing.T) {
 	for _, tc := range tests {
 		h.FlushDB(t, r)
 		h.SeedAllActiveQueues(t, r, tc.active)
+		h.SeedAllLease(t, r, tc.lease)
 
 		got, err := inspector.ListActiveTasks(tc.qname)
 		if err != nil {
@@ -748,6 +848,7 @@ func createScheduledTask(z base.Z) *TaskInfo {
 		z.Message,
 		base.TaskStateScheduled,
 		time.Unix(z.Score, 0),
+		nil,
 	)
 }
 
@@ -817,6 +918,7 @@ func createRetryTask(z base.Z) *TaskInfo {
 		z.Message,
 		base.TaskStateRetry,
 		time.Unix(z.Score, 0),
+		nil,
 	)
 }
 
@@ -887,6 +989,7 @@ func createArchivedTask(z base.Z) *TaskInfo {
 		z.Message,
 		base.TaskStateArchived,
 		time.Time{}, // zero value for n/a
+		nil,
 	)
 }
 
@@ -951,6 +1054,183 @@ func TestInspectorListArchivedTasks(t *testing.T) {
 	}
 }
 
+func newCompletedTaskMessage(typename, qname string, retention time.Duration, completedAt time.Time) *base.TaskMessage {
+	msg := h.NewTaskMessageWithQueue(typename, nil, qname)
+	msg.Retention = int64(retention.Seconds())
+	msg.CompletedAt = completedAt.Unix()
+	return msg
+}
+
+func createCompletedTask(z base.Z) *TaskInfo {
+	return newTaskInfo(
+		z.Message,
+		base.TaskStateCompleted,
+		time.Time{}, // zero value for n/a
+		nil,         // TODO: Test with result data
+	)
+}
+
+func TestInspectorListCompletedTasks(t *testing.T) {
+	r := setup(t)
+	defer r.Close()
+	now := time.Now()
+	m1 := newCompletedTaskMessage("task1", "default", 1*time.Hour, now.Add(-3*time.Minute))     // Expires in 57 mins
+	m2 := newCompletedTaskMessage("task2", "default", 30*time.Minute, now.Add(-10*time.Minute)) // Expires in 20 mins
+	m3 := newCompletedTaskMessage("task3", "default", 2*time.Hour, now.Add(-30*time.Minute))    // Expires in 90 mins
+	m4 := newCompletedTaskMessage("task4", "custom", 15*time.Minute, now.Add(-2*time.Minute))   // Expires in 13 mins
+	z1 := base.Z{Message: m1, Score: m1.CompletedAt + m1.Retention}
+	z2 := base.Z{Message: m2, Score: m2.CompletedAt + m2.Retention}
+	z3 := base.Z{Message: m3, Score: m3.CompletedAt + m3.Retention}
+	z4 := base.Z{Message: m4, Score: m4.CompletedAt + m4.Retention}
+
+	inspector := NewInspector(getRedisConnOpt(t))
+
+	tests := []struct {
+		desc      string
+		completed map[string][]base.Z
+		qname     string
+		want      []*TaskInfo
+	}{
+		{
+			desc: "with a few completed tasks",
+			completed: map[string][]base.Z{
+				"default": {z1, z2, z3},
+				"custom":  {z4},
+			},
+			qname: "default",
+			// Should be sorted by expiration time (CompletedAt + Retention).
+			want: []*TaskInfo{
+				createCompletedTask(z2),
+				createCompletedTask(z1),
+				createCompletedTask(z3),
+			},
+		},
+		{
+			desc: "with empty completed queue",
+			completed: map[string][]base.Z{
+				"default": {},
+			},
+			qname: "default",
+			want:  []*TaskInfo(nil),
+		},
+	}
+
+	for _, tc := range tests {
+		h.FlushDB(t, r)
+		h.SeedAllCompletedQueues(t, r, tc.completed)
+
+		got, err := inspector.ListCompletedTasks(tc.qname)
+		if err != nil {
+			t.Errorf("%s; ListCompletedTasks(%q) returned error: %v", tc.desc, tc.qname, err)
+			continue
+		}
+		if diff := cmp.Diff(tc.want, got, cmp.AllowUnexported(TaskInfo{})); diff != "" {
+			t.Errorf("%s; ListCompletedTasks(%q) = %v, want %v; (-want,+got)\n%s",
+				tc.desc, tc.qname, got, tc.want, diff)
+		}
+	}
+}
+
+func TestInspectorListAggregatingTasks(t *testing.T) {
+	r := setup(t)
+	defer r.Close()
+	now := time.Now()
+
+	m1 := h.NewTaskMessageBuilder().SetType("task1").SetQueue("default").SetGroup("group1").Build()
+	m2 := h.NewTaskMessageBuilder().SetType("task2").SetQueue("default").SetGroup("group1").Build()
+	m3 := h.NewTaskMessageBuilder().SetType("task3").SetQueue("default").SetGroup("group1").Build()
+	m4 := h.NewTaskMessageBuilder().SetType("task4").SetQueue("default").SetGroup("group2").Build()
+	m5 := h.NewTaskMessageBuilder().SetType("task5").SetQueue("custom").SetGroup("group1").Build()
+
+	inspector := NewInspector(getRedisConnOpt(t))
+
+	fxt := struct {
+		tasks     []*h.TaskSeedData
+		allQueues []string
+		allGroups map[string][]string
+		groups    map[string][]redis.Z
+	}{
+		tasks: []*h.TaskSeedData{
+			{Msg: m1, State: base.TaskStateAggregating},
+			{Msg: m2, State: base.TaskStateAggregating},
+			{Msg: m3, State: base.TaskStateAggregating},
+			{Msg: m4, State: base.TaskStateAggregating},
+			{Msg: m5, State: base.TaskStateAggregating},
+		},
+		allQueues: []string{"default", "custom"},
+		allGroups: map[string][]string{
+			base.AllGroups("default"): {"group1", "group2"},
+			base.AllGroups("custom"):  {"group1"},
+		},
+		groups: map[string][]redis.Z{
+			base.GroupKey("default", "group1"): {
+				{Member: m1.ID, Score: float64(now.Add(-30 * time.Second).Unix())},
+				{Member: m2.ID, Score: float64(now.Add(-20 * time.Second).Unix())},
+				{Member: m3.ID, Score: float64(now.Add(-10 * time.Second).Unix())},
+			},
+			base.GroupKey("default", "group2"): {
+				{Member: m4.ID, Score: float64(now.Add(-30 * time.Second).Unix())},
+			},
+			base.GroupKey("custom", "group1"): {
+				{Member: m5.ID, Score: float64(now.Add(-30 * time.Second).Unix())},
+			},
+		},
+	}
+
+	tests := []struct {
+		desc  string
+		qname string
+		gname string
+		want  []*TaskInfo
+	}{
+		{
+			desc:  "default queue group1",
+			qname: "default",
+			gname: "group1",
+			want: []*TaskInfo{
+				createAggregatingTaskInfo(m1),
+				createAggregatingTaskInfo(m2),
+				createAggregatingTaskInfo(m3),
+			},
+		},
+		{
+			desc:  "custom queue group1",
+			qname: "custom",
+			gname: "group1",
+			want: []*TaskInfo{
+				createAggregatingTaskInfo(m5),
+			},
+		},
+	}
+
+	for _, tc := range tests {
+		h.FlushDB(t, r)
+		h.SeedTasks(t, r, fxt.tasks)
+		h.SeedRedisSet(t, r, base.AllQueues, fxt.allQueues)
+		h.SeedRedisSets(t, r, fxt.allGroups)
+		h.SeedRedisZSets(t, r, fxt.groups)
+
+		t.Run(tc.desc, func(t *testing.T) {
+			got, err := inspector.ListAggregatingTasks(tc.qname, tc.gname)
+			if err != nil {
+				t.Fatalf("ListAggregatingTasks returned error: %v", err)
+			}
+
+			cmpOpts := []cmp.Option{
+				cmpopts.EquateApproxTime(2 * time.Second),
+				cmp.AllowUnexported(TaskInfo{}),
+			}
+			if diff := cmp.Diff(tc.want, got, cmpOpts...); diff != "" {
+				t.Errorf("ListAggregatingTasks = %v, want = %v; (-want,+got)\n%s", got, tc.want, diff)
+			}
+		})
+	}
+}
+
+func createAggregatingTaskInfo(msg *base.TaskMessage) *TaskInfo {
+	return newTaskInfo(msg, base.TaskStateAggregating, time.Time{}, nil)
+}
+
 func TestInspectorListPagination(t *testing.T) {
 	// Create 100 tasks.
 	var msgs []*base.TaskMessage
@@ -1049,6 +1329,12 @@ func TestInspectorListTasksQueueNotFoundError(t *testing.T) {
 		if _, err := inspector.ListArchivedTasks(tc.qname); !errors.Is(err, tc.wantErr) {
 			t.Errorf("ListArchivedTasks(%q) returned error %v, want %v", tc.qname, err, tc.wantErr)
 		}
+		if _, err := inspector.ListCompletedTasks(tc.qname); !errors.Is(err, tc.wantErr) {
+			t.Errorf("ListCompletedTasks(%q) returned error %v, want %v", tc.qname, err, tc.wantErr)
+		}
+		if _, err := inspector.ListAggregatingTasks(tc.qname, "mygroup"); !errors.Is(err, tc.wantErr) {
+			t.Errorf("ListAggregatingTasks(%q, \"mygroup\") returned error %v, want %v", tc.qname, err, tc.wantErr)
+		}
 	}
 }
 
@@ -1314,6 +1600,72 @@ func TestInspectorDeleteAllArchivedTasks(t *testing.T) {
 	}
 }
 
+func TestInspectorDeleteAllCompletedTasks(t *testing.T) {
+	r := setup(t)
+	defer r.Close()
+	now := time.Now()
+	m1 := newCompletedTaskMessage("task1", "default", 30*time.Minute, now.Add(-2*time.Minute))
+	m2 := newCompletedTaskMessage("task2", "default", 30*time.Minute, now.Add(-5*time.Minute))
+	m3 := newCompletedTaskMessage("task3", "default", 30*time.Minute, now.Add(-10*time.Minute))
+	m4 := newCompletedTaskMessage("task4", "custom", 30*time.Minute, now.Add(-3*time.Minute))
+	z1 := base.Z{Message: m1, Score: m1.CompletedAt + m1.Retention}
+	z2 := base.Z{Message: m2, Score: m2.CompletedAt + m2.Retention}
+	z3 := base.Z{Message: m3, Score: m3.CompletedAt + m3.Retention}
+	z4 := base.Z{Message: m4, Score: m4.CompletedAt + m4.Retention}
+
+	inspector := NewInspector(getRedisConnOpt(t))
+
+	tests := []struct {
+		completed     map[string][]base.Z
+		qname         string
+		want          int
+		wantCompleted map[string][]base.Z
+	}{
+		{
+			completed: map[string][]base.Z{
+				"default": {z1, z2, z3},
+				"custom":  {z4},
+			},
+			qname: "default",
+			want:  3,
+			wantCompleted: map[string][]base.Z{
+				"default": {},
+				"custom":  {z4},
+			},
+		},
+		{
+			completed: map[string][]base.Z{
+				"default": {},
+			},
+			qname: "default",
+			want:  0,
+			wantCompleted: map[string][]base.Z{
+				"default": {},
+			},
+		},
+	}
+
+	for _, tc := range tests {
+		h.FlushDB(t, r)
+		h.SeedAllCompletedQueues(t, r, tc.completed)
+
+		got, err := inspector.DeleteAllCompletedTasks(tc.qname)
+		if err != nil {
+			t.Errorf("DeleteAllCompletedTasks(%q) returned error: %v", tc.qname, err)
+			continue
+		}
+		if got != tc.want {
+			t.Errorf("DeleteAllCompletedTasks(%q) = %d, want %d", tc.qname, got, tc.want)
+		}
+		for qname, want := range tc.wantCompleted {
+			gotCompleted := h.GetCompletedEntries(t, r, qname)
+			if diff := cmp.Diff(want, gotCompleted, h.SortZSetEntryOpt); diff != "" {
+				t.Errorf("unexpected completed tasks in queue %q: (-want, +got)\n%s", qname, diff)
+			}
+		}
+	}
+}
+
 func TestInspectorArchiveAllPendingTasks(t *testing.T) {
 	r := setup(t)
 	defer r.Close()
@@ -1325,6 +1677,7 @@ func TestInspectorArchiveAllPendingTasks(t *testing.T) {
 	z1 := base.Z{Message: m1, Score: now.Add(5 * time.Minute).Unix()}
 	z2 := base.Z{Message: m2, Score: now.Add(15 * time.Minute).Unix()}
 	inspector := NewInspector(getRedisConnOpt(t))
+	inspector.rdb.SetClock(timeutil.NewSimulatedClock(now))
 
 	tests := []struct {
 		pending      map[string][]*base.TaskMessage
@@ -1416,12 +1769,8 @@ func TestInspectorArchiveAllPendingTasks(t *testing.T) {
 			}
 		}
 		for qname, want := range tc.wantArchived {
-			// Allow Z.Score to differ by up to 2.
-			approxOpt := cmp.Comparer(func(a, b int64) bool {
-				return math.Abs(float64(a-b)) < 2
-			})
 			gotArchived := h.GetArchivedEntries(t, r, qname)
-			if diff := cmp.Diff(want, gotArchived, h.SortZSetEntryOpt, approxOpt); diff != "" {
+			if diff := cmp.Diff(want, gotArchived, h.SortZSetEntryOpt); diff != "" {
 				t.Errorf("unexpected archived tasks in queue %q: (-want, +got)\n%s", qname, diff)
 			}
 		}
@@ -1442,6 +1791,7 @@ func TestInspectorArchiveAllScheduledTasks(t *testing.T) {
 	z4 := base.Z{Message: m4, Score: now.Add(2 * time.Minute).Unix()}
 
 	inspector := NewInspector(getRedisConnOpt(t))
+	inspector.rdb.SetClock(timeutil.NewSimulatedClock(now))
 
 	tests := []struct {
 		scheduled     map[string][]base.Z
@@ -1549,12 +1899,8 @@ func TestInspectorArchiveAllScheduledTasks(t *testing.T) {
 			}
 		}
 		for qname, want := range tc.wantArchived {
-			// Allow Z.Score to differ by up to 2.
-			approxOpt := cmp.Comparer(func(a, b int64) bool {
-				return math.Abs(float64(a-b)) < 2
-			})
 			gotArchived := h.GetArchivedEntries(t, r, qname)
-			if diff := cmp.Diff(want, gotArchived, h.SortZSetEntryOpt, approxOpt); diff != "" {
+			if diff := cmp.Diff(want, gotArchived, h.SortZSetEntryOpt); diff != "" {
 				t.Errorf("unexpected archived tasks in queue %q: (-want, +got)\n%s", qname, diff)
 			}
 		}
@@ -1575,6 +1921,7 @@ func TestInspectorArchiveAllRetryTasks(t *testing.T) {
 	z4 := base.Z{Message: m4, Score: now.Add(2 * time.Minute).Unix()}
 
 	inspector := NewInspector(getRedisConnOpt(t))
+	inspector.rdb.SetClock(timeutil.NewSimulatedClock(now))
 
 	tests := []struct {
 		retry        map[string][]base.Z
@@ -1665,10 +2012,9 @@ func TestInspectorArchiveAllRetryTasks(t *testing.T) {
 				t.Errorf("unexpected retry tasks in queue %q: (-want, +got)\n%s", qname, diff)
 			}
 		}
-		cmpOpt := h.EquateInt64Approx(2) // allow for 2 seconds difference in Z.Score
 		for qname, want := range tc.wantArchived {
 			wantArchived := h.GetArchivedEntries(t, r, qname)
-			if diff := cmp.Diff(want, wantArchived, h.SortZSetEntryOpt, cmpOpt); diff != "" {
+			if diff := cmp.Diff(want, wantArchived, h.SortZSetEntryOpt); diff != "" {
 				t.Errorf("unexpected archived tasks in queue %q: (-want, +got)\n%s", qname, diff)
 			}
 		}
@@ -2616,8 +2962,9 @@ func TestInspectorArchiveTaskArchivesPendingTask(t *testing.T) {
 	m1 := h.NewTaskMessage("task1", nil)
 	m2 := h.NewTaskMessageWithQueue("task2", nil, "custom")
 	m3 := h.NewTaskMessageWithQueue("task3", nil, "custom")
-	inspector := NewInspector(getRedisConnOpt(t))
 	now := time.Now()
+	inspector := NewInspector(getRedisConnOpt(t))
+	inspector.rdb.SetClock(timeutil.NewSimulatedClock(now))
 
 	tests := []struct {
 		pending      map[string][]*base.TaskMessage
@@ -2712,6 +3059,7 @@ func TestInspectorArchiveTaskArchivesScheduledTask(t *testing.T) {
 	z3 := base.Z{Message: m3, Score: now.Add(2 * time.Minute).Unix()}
 
 	inspector := NewInspector(getRedisConnOpt(t))
+	inspector.rdb.SetClock(timeutil.NewSimulatedClock(now))
 
 	tests := []struct {
 		scheduled     map[string][]base.Z
@@ -2788,6 +3136,7 @@ func TestInspectorArchiveTaskArchivesRetryTask(t *testing.T) {
 	z3 := base.Z{Message: m3, Score: now.Add(2 * time.Minute).Unix()}
 
 	inspector := NewInspector(getRedisConnOpt(t))
+	inspector.rdb.SetClock(timeutil.NewSimulatedClock(now))
 
 	tests := []struct {
 		retry        map[string][]base.Z
@@ -2862,6 +3211,7 @@ func TestInspectorArchiveTaskError(t *testing.T) {
 	z3 := base.Z{Message: m3, Score: now.Add(2 * time.Minute).Unix()}
 
 	inspector := NewInspector(getRedisConnOpt(t))
+	inspector.rdb.SetClock(timeutil.NewSimulatedClock(now))
 
 	tests := []struct {
 		retry        map[string][]base.Z
@@ -3033,6 +3383,7 @@ func TestParseOption(t *testing.T) {
 		{`Unique(1h)`, UniqueOpt, 1 * time.Hour},
 		{ProcessAt(oneHourFromNow).String(), ProcessAtOpt, oneHourFromNow},
 		{`ProcessIn(10m)`, ProcessInOpt, 10 * time.Minute},
+		{`Retention(24h)`, RetentionOpt, 24 * time.Hour},
 	}
 
 	for _, tc := range tests {
@@ -3064,7 +3415,7 @@ func TestParseOption(t *testing.T) {
 				if gotVal != tc.wantVal.(int) {
 					t.Fatalf("got value %v, want %v", gotVal, tc.wantVal)
 				}
-			case TimeoutOpt, UniqueOpt, ProcessInOpt:
+			case TimeoutOpt, UniqueOpt, ProcessInOpt, RetentionOpt:
 				gotVal, ok := got.Value().(time.Duration)
 				if !ok {
 					t.Fatal("returned Option with non duration value")
@@ -3086,3 +3437,99 @@ func TestParseOption(t *testing.T) {
 		})
 	}
 }
+
+func TestInspectorGroups(t *testing.T) {
+	r := setup(t)
+	defer r.Close()
+	inspector := NewInspector(getRedisConnOpt(t))
+
+	m1 := h.NewTaskMessageBuilder().SetGroup("group1").Build()
+	m2 := h.NewTaskMessageBuilder().SetGroup("group1").Build()
+	m3 := h.NewTaskMessageBuilder().SetGroup("group1").Build()
+	m4 := h.NewTaskMessageBuilder().SetGroup("group2").Build()
+	m5 := h.NewTaskMessageBuilder().SetQueue("custom").SetGroup("group1").Build()
+	m6 := h.NewTaskMessageBuilder().SetQueue("custom").SetGroup("group1").Build()
+
+	now := time.Now()
+
+	fixtures := struct {
+		tasks     []*h.TaskSeedData
+		allGroups map[string][]string
+		groups    map[string][]redis.Z
+	}{
+		tasks: []*h.TaskSeedData{
+			{Msg: m1, State: base.TaskStateAggregating},
+			{Msg: m2, State: base.TaskStateAggregating},
+			{Msg: m3, State: base.TaskStateAggregating},
+			{Msg: m4, State: base.TaskStateAggregating},
+			{Msg: m5, State: base.TaskStateAggregating},
+		},
+		allGroups: map[string][]string{
+			base.AllGroups("default"): {"group1", "group2"},
+			base.AllGroups("custom"):  {"group1"},
+		},
+		groups: map[string][]redis.Z{
+			base.GroupKey("default", "group1"): {
+				{Member: m1.ID, Score: float64(now.Add(-10 * time.Second).Unix())},
+				{Member: m2.ID, Score: float64(now.Add(-20 * time.Second).Unix())},
+				{Member: m3.ID, Score: float64(now.Add(-30 * time.Second).Unix())},
+			},
+			base.GroupKey("default", "group2"): {
+				{Member: m4.ID, Score: float64(now.Add(-20 * time.Second).Unix())},
+			},
+			base.GroupKey("custom", "group1"): {
+				{Member: m5.ID, Score: float64(now.Add(-10 * time.Second).Unix())},
+				{Member: m6.ID, Score: float64(now.Add(-20 * time.Second).Unix())},
+			},
+		},
+	}
+
+	tests := []struct {
+		desc  string
+		qname string
+		want  []*GroupInfo
+	}{
+		{
+			desc:  "default queue groups",
+			qname: "default",
+			want: []*GroupInfo{
+				{Group: "group1", Size: 3},
+				{Group: "group2", Size: 1},
+			},
+		},
+		{
+			desc:  "custom queue groups",
+			qname: "custom",
+			want: []*GroupInfo{
+				{Group: "group1", Size: 2},
+			},
+		},
+	}
+
+	var sortGroupInfosOpt = cmp.Transformer(
+		"SortGroupInfos",
+		func(in []*GroupInfo) []*GroupInfo {
+			out := append([]*GroupInfo(nil), in...)
+			sort.Slice(out, func(i, j int) bool {
+				return out[i].Group < out[j].Group
+			})
+			return out
+		})
+
+	for _, tc := range tests {
+		h.FlushDB(t, r)
+		h.SeedTasks(t, r, fixtures.tasks)
+		h.SeedRedisSets(t, r, fixtures.allGroups)
+		h.SeedRedisZSets(t, r, fixtures.groups)
+
+		t.Run(tc.desc, func(t *testing.T) {
+			got, err := inspector.Groups(tc.qname)
+			if err != nil {
+				t.Fatalf("Groups returned error: %v", err)
+			}
+			if diff := cmp.Diff(tc.want, got, sortGroupInfosOpt); diff != "" {
+				t.Errorf("Groups = %v, want %v; (-want,+got)\n%s", got, tc.want, diff)
+			}
+		})
+	}
+}

internal/base/base.go

@@ -14,16 +14,16 @@ import (
 	"sync"
 	"time"
 
-	"github.com/go-redis/redis/v7"
-	"github.com/golang/protobuf/ptypes"
-	"github.com/google/uuid"
 	"github.com/hibiken/asynq/internal/errors"
 	pb "github.com/hibiken/asynq/internal/proto"
+	"github.com/hibiken/asynq/internal/timeutil"
+	"github.com/redis/go-redis/v9"
 	"google.golang.org/protobuf/proto"
+	"google.golang.org/protobuf/types/known/timestamppb"
 )
 
 // Version of asynq library and CLI.
-const Version = "0.18.3"
+const Version = "0.25.0"
 
 // DefaultQueueName is the queue name used if none are specified by user.
 const DefaultQueueName = "default"
@@ -49,6 +49,8 @@ const (
 	TaskStateScheduled
 	TaskStateRetry
 	TaskStateArchived
+	TaskStateCompleted
+	TaskStateAggregating // describes a state where task is waiting in a group to be aggregated
 )
 
 func (s TaskState) String() string {
@@ -63,6 +65,10 @@ func (s TaskState) String() string {
 		return "retry"
 	case TaskStateArchived:
 		return "archived"
+	case TaskStateCompleted:
+		return "completed"
+	case TaskStateAggregating:
+		return "aggregating"
 	}
 	panic(fmt.Sprintf("internal error: unknown task state %d", s))
 }
@@ -79,6 +85,10 @@ func TaskStateFromString(s string) (TaskState, error) {
 		return TaskStateRetry, nil
 	case "archived":
 		return TaskStateArchived, nil
+	case "completed":
+		return TaskStateCompleted, nil
+	case "aggregating":
+		return TaskStateAggregating, nil
 	}
 	return 0, errors.E(errors.FailedPrecondition, fmt.Sprintf("%q is not supported task state", s))
 }
@@ -94,62 +104,76 @@ func ValidateQueueName(qname string) error {
 
 // QueueKeyPrefix returns a prefix for all keys in the given queue.
 func QueueKeyPrefix(qname string) string {
-	return fmt.Sprintf("asynq:{%s}:", qname)
+	return "asynq:{" + qname + "}:"
 }
 
 // TaskKeyPrefix returns a prefix for task key.
 func TaskKeyPrefix(qname string) string {
-	return fmt.Sprintf("%st:", QueueKeyPrefix(qname))
+	return QueueKeyPrefix(qname) + "t:"
 }
 
 // TaskKey returns a redis key for the given task message.
 func TaskKey(qname, id string) string {
-	return fmt.Sprintf("%s%s", TaskKeyPrefix(qname), id)
+	return TaskKeyPrefix(qname) + id
 }
 
 // PendingKey returns a redis key for the given queue name.
 func PendingKey(qname string) string {
-	return fmt.Sprintf("%spending", QueueKeyPrefix(qname))
+	return QueueKeyPrefix(qname) + "pending"
 }
 
 // ActiveKey returns a redis key for the active tasks.
 func ActiveKey(qname string) string {
-	return fmt.Sprintf("%sactive", QueueKeyPrefix(qname))
+	return QueueKeyPrefix(qname) + "active"
 }
 
 // ScheduledKey returns a redis key for the scheduled tasks.
 func ScheduledKey(qname string) string {
-	return fmt.Sprintf("%sscheduled", QueueKeyPrefix(qname))
+	return QueueKeyPrefix(qname) + "scheduled"
 }
 
 // RetryKey returns a redis key for the retry tasks.
 func RetryKey(qname string) string {
-	return fmt.Sprintf("%sretry", QueueKeyPrefix(qname))
+	return QueueKeyPrefix(qname) + "retry"
 }
 
 // ArchivedKey returns a redis key for the archived tasks.
 func ArchivedKey(qname string) string {
-	return fmt.Sprintf("%sarchived", QueueKeyPrefix(qname))
+	return QueueKeyPrefix(qname) + "archived"
 }
 
-// DeadlinesKey returns a redis key for the deadlines.
-func DeadlinesKey(qname string) string {
-	return fmt.Sprintf("%sdeadlines", QueueKeyPrefix(qname))
+// LeaseKey returns a redis key for the lease.
+func LeaseKey(qname string) string {
+	return QueueKeyPrefix(qname) + "lease"
+}
+
+func CompletedKey(qname string) string {
+	return QueueKeyPrefix(qname) + "completed"
 }
 
 // PausedKey returns a redis key to indicate that the given queue is paused.
 func PausedKey(qname string) string {
-	return fmt.Sprintf("%spaused", QueueKeyPrefix(qname))
+	return QueueKeyPrefix(qname) + "paused"
+}
+
+// ProcessedTotalKey returns a redis key for total processed count for the given queue.
+func ProcessedTotalKey(qname string) string {
+	return QueueKeyPrefix(qname) + "processed"
+}
+
+// FailedTotalKey returns a redis key for total failure count for the given queue.
+func FailedTotalKey(qname string) string {
+	return QueueKeyPrefix(qname) + "failed"
 }
 
 // ProcessedKey returns a redis key for processed count for the given day for the queue.
 func ProcessedKey(qname string, t time.Time) string {
-	return fmt.Sprintf("%sprocessed:%s", QueueKeyPrefix(qname), t.UTC().Format("2006-01-02"))
+	return QueueKeyPrefix(qname) + "processed:" + t.UTC().Format("2006-01-02")
 }
 
 // FailedKey returns a redis key for failure count for the given day for the queue.
 func FailedKey(qname string, t time.Time) string {
-	return fmt.Sprintf("%sfailed:%s", QueueKeyPrefix(qname), t.UTC().Format("2006-01-02"))
+	return QueueKeyPrefix(qname) + "failed:" + t.UTC().Format("2006-01-02")
 }
 
 // ServerInfoKey returns a redis key for process info.
@@ -164,21 +188,47 @@ func WorkersKey(hostname string, pid int, serverID string) string {
 
 // SchedulerEntriesKey returns a redis key for the scheduler entries given scheduler ID.
 func SchedulerEntriesKey(schedulerID string) string {
-	return fmt.Sprintf("asynq:schedulers:{%s}", schedulerID)
+	return "asynq:schedulers:{" + schedulerID + "}"
 }
 
 // SchedulerHistoryKey returns a redis key for the scheduler's history for the given entry.
 func SchedulerHistoryKey(entryID string) string {
-	return fmt.Sprintf("asynq:scheduler_history:%s", entryID)
+	return "asynq:scheduler_history:" + entryID
 }
 
 // UniqueKey returns a redis key with the given type, payload, and queue name.
 func UniqueKey(qname, tasktype string, payload []byte) string {
 	if payload == nil {
-		return fmt.Sprintf("%sunique:%s:", QueueKeyPrefix(qname), tasktype)
+		return QueueKeyPrefix(qname) + "unique:" + tasktype + ":"
 	}
 	checksum := md5.Sum(payload)
-	return fmt.Sprintf("%sunique:%s:%s", QueueKeyPrefix(qname), tasktype, hex.EncodeToString(checksum[:]))
+	return QueueKeyPrefix(qname) + "unique:" + tasktype + ":" + hex.EncodeToString(checksum[:])
+}
+
+// GroupKeyPrefix returns a prefix for group key.
+func GroupKeyPrefix(qname string) string {
+	return QueueKeyPrefix(qname) + "g:"
+}
+
+// GroupKey returns a redis key used to group tasks belong in the same group.
+func GroupKey(qname, gkey string) string {
+	return GroupKeyPrefix(qname) + gkey
+}
+
+// AggregationSetKey returns a redis key used for an aggregation set.
+func AggregationSetKey(qname, gname, setID string) string {
+	return GroupKey(qname, gname) + ":" + setID
+}
+
+// AllGroups return a redis key used to store all group keys used in a given queue.
+func AllGroups(qname string) string {
+	return QueueKeyPrefix(qname) + "groups"
+}
+
+// AllAggregationSets returns a redis key used to store all aggregation sets (set of tasks staged to be aggregated)
+// in a given queue.
+func AllAggregationSets(qname string) string {
+	return QueueKeyPrefix(qname) + "aggregation_sets"
 }
 
 // TaskMessage is the internal representation of a task with additional metadata fields.
@@ -191,7 +241,7 @@ type TaskMessage struct {
 	Payload []byte
 
 	// ID is a unique identifier for each task.
-	ID uuid.UUID
+	ID string
 
 	// Queue is a name this message should be enqueued to.
 	Queue string
@@ -230,6 +280,20 @@ type TaskMessage struct {
 	//
 	// Empty string indicates that no uniqueness lock was used.
 	UniqueKey string
+
+	// GroupKey holds the group key used for task aggregation.
+	//
+	// Empty string indicates no aggregation is used for this task.
+	GroupKey string
+
+	// Retention specifies the number of seconds the task should be retained after completion.
+	Retention int64
+
+	// CompletedAt is the time the task was processed successfully in Unix time,
+	// the number of seconds elapsed since January 1, 1970 UTC.
+	//
+	// Use zero to indicate no value.
+	CompletedAt int64
 }
 
 // EncodeMessage marshals the given task message and returns an encoded bytes.
@@ -240,7 +304,7 @@ func EncodeMessage(msg *TaskMessage) ([]byte, error) {
 	return proto.Marshal(&pb.TaskMessage{
 		Type:         msg.Type,
 		Payload:      msg.Payload,
-		Id:           msg.ID.String(),
+		Id:           msg.ID,
 		Queue:        msg.Queue,
 		Retry:        int32(msg.Retry),
 		Retried:      int32(msg.Retried),
@@ -249,6 +313,9 @@ func EncodeMessage(msg *TaskMessage) ([]byte, error) {
 		Timeout:      msg.Timeout,
 		Deadline:     msg.Deadline,
 		UniqueKey:    msg.UniqueKey,
+		GroupKey:     msg.GroupKey,
+		Retention:    msg.Retention,
+		CompletedAt:  msg.CompletedAt,
 	})
 }
 
@@ -261,7 +328,7 @@ func DecodeMessage(data []byte) (*TaskMessage, error) {
 	return &TaskMessage{
 		Type:         pbmsg.GetType(),
 		Payload:      pbmsg.GetPayload(),
-		ID:           uuid.MustParse(pbmsg.GetId()),
+		ID:           pbmsg.GetId(),
 		Queue:        pbmsg.GetQueue(),
 		Retry:        int(pbmsg.GetRetry()),
 		Retried:      int(pbmsg.GetRetried()),
@@ -270,6 +337,9 @@ func DecodeMessage(data []byte) (*TaskMessage, error) {
 		Timeout:      pbmsg.GetTimeout(),
 		Deadline:     pbmsg.GetDeadline(),
 		UniqueKey:    pbmsg.GetUniqueKey(),
+		GroupKey:     pbmsg.GetGroupKey(),
+		Retention:    pbmsg.GetRetention(),
+		CompletedAt:  pbmsg.GetCompletedAt(),
 	}, nil
 }
 
@@ -278,6 +348,7 @@ type TaskInfo struct {
 	Message       *TaskMessage
 	State         TaskState
 	NextProcessAt time.Time
+	Result        []byte
 }
 
 // Z represents sorted set member.
@@ -286,68 +357,6 @@ type Z struct {
 	Score   int64
 }
 
-// ServerState represents state of a server.
-// ServerState methods are concurrency safe.
-type ServerState struct {
-	mu  sync.Mutex
-	val ServerStateValue
-}
-
-// NewServerState returns a new state instance.
-// Initial state is set to StateNew.
-func NewServerState() *ServerState {
-	return &ServerState{val: StateNew}
-}
-
-type ServerStateValue int
-
-const (
-	// StateNew represents a new server. Server begins in
-	// this state and then transition to StatusActive when
-	// Start or Run is callled.
-	StateNew ServerStateValue = iota
-
-	// StateActive indicates the server is up and active.
-	StateActive
-
-	// StateStopped indicates the server is up but no longer processing new tasks.
-	StateStopped
-
-	// StateClosed indicates the server has been shutdown.
-	StateClosed
-)
-
-var serverStates = []string{
-	"new",
-	"active",
-	"stopped",
-	"closed",
-}
-
-func (s *ServerState) String() string {
-	s.mu.Lock()
-	defer s.mu.Unlock()
-	if StateNew <= s.val && s.val <= StateClosed {
-		return serverStates[s.val]
-	}
-	return "unknown status"
-}
-
-// Get returns the status value.
-func (s *ServerState) Get() ServerStateValue {
-	s.mu.Lock()
-	v := s.val
-	s.mu.Unlock()
-	return v
-}
-
-// Set sets the status value.
-func (s *ServerState) Set(v ServerStateValue) {
-	s.mu.Lock()
-	s.val = v
-	s.mu.Unlock()
-}
-
 // ServerInfo holds information about a running server.
 type ServerInfo struct {
 	Host              string
@@ -366,14 +375,12 @@ func EncodeServerInfo(info *ServerInfo) ([]byte, error) {
 	if info == nil {
 		return nil, fmt.Errorf("cannot encode nil server info")
 	}
-	queues := make(map[string]int32)
+	queues := make(map[string]int32, len(info.Queues))
 	for q, p := range info.Queues {
 		queues[q] = int32(p)
 	}
-	started, err := ptypes.TimestampProto(info.Started)
-	if err != nil {
-		return nil, err
-	}
+	started := timestamppb.New(info.Started)
+
 	return proto.Marshal(&pb.ServerInfo{
 		Host:              info.Host,
 		Pid:               int32(info.PID),
@@ -393,14 +400,12 @@ func DecodeServerInfo(b []byte) (*ServerInfo, error) {
 	if err := proto.Unmarshal(b, &pbmsg); err != nil {
 		return nil, err
 	}
-	queues := make(map[string]int)
+	queues := make(map[string]int, len(pbmsg.GetQueues()))
 	for q, p := range pbmsg.GetQueues() {
 		queues[q] = int(p)
 	}
-	startTime, err := ptypes.Timestamp(pbmsg.GetStartTime())
-	if err != nil {
-		return nil, err
-	}
+	startTime := pbmsg.GetStartTime()
+
 	return &ServerInfo{
 		Host:              pbmsg.GetHost(),
 		PID:               int(pbmsg.GetPid()),
@@ -409,7 +414,7 @@ func DecodeServerInfo(b []byte) (*ServerInfo, error) {
 		Queues:            queues,
 		StrictPriority:    pbmsg.GetStrictPriority(),
 		Status:            pbmsg.GetStatus(),
-		Started:           startTime,
+		Started:           startTime.AsTime(),
 		ActiveWorkerCount: int(pbmsg.GetActiveWorkerCount()),
 	}, nil
 }
@@ -432,14 +437,9 @@ func EncodeWorkerInfo(info *WorkerInfo) ([]byte, error) {
 	if info == nil {
 		return nil, fmt.Errorf("cannot encode nil worker info")
 	}
-	startTime, err := ptypes.TimestampProto(info.Started)
-	if err != nil {
-		return nil, err
-	}
-	deadline, err := ptypes.TimestampProto(info.Deadline)
-	if err != nil {
-		return nil, err
-	}
+	startTime := timestamppb.New(info.Started)
+	deadline := timestamppb.New(info.Deadline)
+
 	return proto.Marshal(&pb.WorkerInfo{
 		Host:        info.Host,
 		Pid:         int32(info.PID),
@@ -459,14 +459,9 @@ func DecodeWorkerInfo(b []byte) (*WorkerInfo, error) {
 	if err := proto.Unmarshal(b, &pbmsg); err != nil {
 		return nil, err
 	}
-	startTime, err := ptypes.Timestamp(pbmsg.GetStartTime())
-	if err != nil {
-		return nil, err
-	}
-	deadline, err := ptypes.Timestamp(pbmsg.GetDeadline())
-	if err != nil {
-		return nil, err
-	}
+	startTime := pbmsg.GetStartTime()
+	deadline := pbmsg.GetDeadline()
+
 	return &WorkerInfo{
 		Host:     pbmsg.GetHost(),
 		PID:      int(pbmsg.GetPid()),
@@ -475,8 +470,8 @@ func DecodeWorkerInfo(b []byte) (*WorkerInfo, error) {
 		Type:     pbmsg.GetTaskType(),
 		Payload:  pbmsg.GetTaskPayload(),
 		Queue:    pbmsg.GetQueue(),
-		Started:  startTime,
-		Deadline: deadline,
+		Started:  startTime.AsTime(),
+		Deadline: deadline.AsTime(),
 	}, nil
 }
 
@@ -510,14 +505,9 @@ func EncodeSchedulerEntry(entry *SchedulerEntry) ([]byte, error) {
 	if entry == nil {
 		return nil, fmt.Errorf("cannot encode nil scheduler entry")
 	}
-	next, err := ptypes.TimestampProto(entry.Next)
-	if err != nil {
-		return nil, err
-	}
-	prev, err := ptypes.TimestampProto(entry.Prev)
-	if err != nil {
-		return nil, err
-	}
+	next := timestamppb.New(entry.Next)
+	prev := timestamppb.New(entry.Prev)
+
 	return proto.Marshal(&pb.SchedulerEntry{
 		Id:              entry.ID,
 		Spec:            entry.Spec,
@@ -535,22 +525,17 @@ func DecodeSchedulerEntry(b []byte) (*SchedulerEntry, error) {
 	if err := proto.Unmarshal(b, &pbmsg); err != nil {
 		return nil, err
 	}
-	next, err := ptypes.Timestamp(pbmsg.GetNextEnqueueTime())
-	if err != nil {
-		return nil, err
-	}
-	prev, err := ptypes.Timestamp(pbmsg.GetPrevEnqueueTime())
-	if err != nil {
-		return nil, err
-	}
+	next := pbmsg.GetNextEnqueueTime()
+	prev := pbmsg.GetPrevEnqueueTime()
+
 	return &SchedulerEntry{
 		ID:      pbmsg.GetId(),
 		Spec:    pbmsg.GetSpec(),
 		Type:    pbmsg.GetTaskType(),
 		Payload: pbmsg.GetTaskPayload(),
 		Opts:    pbmsg.GetEnqueueOptions(),
-		Next:    next,
-		Prev:    prev,
+		Next:    next.AsTime(),
+		Prev:    prev.AsTime(),
 	}, nil
 }
 
@@ -569,10 +554,7 @@ func EncodeSchedulerEnqueueEvent(event *SchedulerEnqueueEvent) ([]byte, error) {
 	if event == nil {
 		return nil, fmt.Errorf("cannot encode nil enqueue event")
 	}
-	enqueuedAt, err := ptypes.TimestampProto(event.EnqueuedAt)
-	if err != nil {
-		return nil, err
-	}
+	enqueuedAt := timestamppb.New(event.EnqueuedAt)
 	return proto.Marshal(&pb.SchedulerEnqueueEvent{
 		TaskId:      event.TaskID,
 		EnqueueTime: enqueuedAt,
@@ -586,19 +568,16 @@ func DecodeSchedulerEnqueueEvent(b []byte) (*SchedulerEnqueueEvent, error) {
 	if err := proto.Unmarshal(b, &pbmsg); err != nil {
 		return nil, err
 	}
-	enqueuedAt, err := ptypes.Timestamp(pbmsg.GetEnqueueTime())
-	if err != nil {
-		return nil, err
-	}
+	enqueuedAt := pbmsg.GetEnqueueTime()
 	return &SchedulerEnqueueEvent{
 		TaskID:     pbmsg.GetTaskId(),
-		EnqueuedAt: enqueuedAt,
+		EnqueuedAt: enqueuedAt.AsTime(),
 	}, nil
 }
 
 // Cancelations is a collection that holds cancel functions for all active tasks.
 //
-// Cancelations are safe for concurrent use by multipel goroutines.
+// Cancelations are safe for concurrent use by multiple goroutines.
 type Cancelations struct {
 	mu          sync.Mutex
 	cancelFuncs map[string]context.CancelFunc
@@ -633,25 +612,114 @@ func (c *Cancelations) Get(id string) (fn context.CancelFunc, ok bool) {
 	return fn, ok
 }
 
+// Lease is a time bound lease for worker to process task.
+// It provides a communication channel between lessor and lessee about lease expiration.
+type Lease struct {
+	once sync.Once
+	ch   chan struct{}
+
+	Clock timeutil.Clock
+
+	mu       sync.Mutex
+	expireAt time.Time // guarded by mu
+}
+
+func NewLease(expirationTime time.Time) *Lease {
+	return &Lease{
+		ch:       make(chan struct{}),
+		expireAt: expirationTime,
+		Clock:    timeutil.NewRealClock(),
+	}
+}
+
+// Reset changes the lease to expire at the given time.
+// It returns true if the lease is still valid and reset operation was successful, false if the lease had been expired.
+func (l *Lease) Reset(expirationTime time.Time) bool {
+	if !l.IsValid() {
+		return false
+	}
+	l.mu.Lock()
+	defer l.mu.Unlock()
+	l.expireAt = expirationTime
+	return true
+}
+
+// Sends a notification to lessee about expired lease
+// Returns true if notification was sent, returns false if the lease is still valid and notification was not sent.
+func (l *Lease) NotifyExpiration() bool {
+	if l.IsValid() {
+		return false
+	}
+	l.once.Do(l.closeCh)
+	return true
+}
+
+func (l *Lease) closeCh() {
+	close(l.ch)
+}
+
+// Done returns a communication channel from which the lessee can read to get notified when lessor notifies about lease expiration.
+func (l *Lease) Done() <-chan struct{} {
+	return l.ch
+}
+
+// Deadline returns the expiration time of the lease.
+func (l *Lease) Deadline() time.Time {
+	l.mu.Lock()
+	defer l.mu.Unlock()
+	return l.expireAt
+}
+
+// IsValid returns true if the lease's expiration time is in the future or equals to the current time,
+// returns false otherwise.
+func (l *Lease) IsValid() bool {
+	now := l.Clock.Now()
+	l.mu.Lock()
+	defer l.mu.Unlock()
+	return l.expireAt.After(now) || l.expireAt.Equal(now)
+}
+
 // Broker is a message broker that supports operations to manage task queues.
 //
 // See rdb.RDB as a reference implementation.
 type Broker interface {
 	Ping() error
-	Enqueue(msg *TaskMessage) error
-	EnqueueUnique(msg *TaskMessage, ttl time.Duration) error
+	Close() error
+	Enqueue(ctx context.Context, msg *TaskMessage) error
+	EnqueueUnique(ctx context.Context, msg *TaskMessage, ttl time.Duration) error
 	Dequeue(qnames ...string) (*TaskMessage, time.Time, error)
-	Done(msg *TaskMessage) error
-	Requeue(msg *TaskMessage) error
-	Schedule(msg *TaskMessage, processAt time.Time) error
-	ScheduleUnique(msg *TaskMessage, processAt time.Time, ttl time.Duration) error
-	Retry(msg *TaskMessage, processAt time.Time, errMsg string) error
-	Archive(msg *TaskMessage, errMsg string) error
+	Done(ctx context.Context, msg *TaskMessage) error
+	MarkAsComplete(ctx context.Context, msg *TaskMessage) error
+	Requeue(ctx context.Context, msg *TaskMessage) error
+	Schedule(ctx context.Context, msg *TaskMessage, processAt time.Time) error
+	ScheduleUnique(ctx context.Context, msg *TaskMessage, processAt time.Time, ttl time.Duration) error
+	Retry(ctx context.Context, msg *TaskMessage, processAt time.Time, errMsg string, isFailure bool) error
+	Archive(ctx context.Context, msg *TaskMessage, errMsg string) error
 	ForwardIfReady(qnames ...string) error
-	ListDeadlineExceeded(deadline time.Time, qnames ...string) ([]*TaskMessage, error)
+
+	// Group aggregation related methods
+	AddToGroup(ctx context.Context, msg *TaskMessage, gname string) error
+	AddToGroupUnique(ctx context.Context, msg *TaskMessage, groupKey string, ttl time.Duration) error
+	ListGroups(qname string) ([]string, error)
+	AggregationCheck(qname, gname string, t time.Time, gracePeriod, maxDelay time.Duration, maxSize int) (aggregationSetID string, err error)
+	ReadAggregationSet(qname, gname, aggregationSetID string) ([]*TaskMessage, time.Time, error)
+	DeleteAggregationSet(ctx context.Context, qname, gname, aggregationSetID string) error
+	ReclaimStaleAggregationSets(qname string) error
+
+	// Task retention related method
+	DeleteExpiredCompletedTasks(qname string, batchSize int) error
+
+	// Lease related methods
+	ListLeaseExpired(cutoff time.Time, qnames ...string) ([]*TaskMessage, error)
+	ExtendLease(qname string, ids ...string) (time.Time, error)
+
+	// State snapshot related methods
 	WriteServerState(info *ServerInfo, workers []*WorkerInfo, ttl time.Duration) error
 	ClearServerState(host string, pid int, serverID string) error
+
+	// Cancelation related methods
 	CancelationPubSub() (*redis.PubSub, error) // TODO: Need to decouple from redis to support other brokers
 	PublishCancelation(id string) error
-	Close() error
+
+	WriteResult(qname, id string, data []byte) (n int, err error)
 }

internal/base/base_test.go

@@ -16,6 +16,7 @@ import (
 
 	"github.com/google/go-cmp/cmp"
 	"github.com/google/uuid"
+	"github.com/hibiken/asynq/internal/timeutil"
 )
 
 func TestTaskKey(t *testing.T) {
@@ -71,19 +72,19 @@ func TestActiveKey(t *testing.T) {
 	}
 }
 
-func TestDeadlinesKey(t *testing.T) {
+func TestLeaseKey(t *testing.T) {
 	tests := []struct {
 		qname string
 		want  string
 	}{
-		{"default", "asynq:{default}:deadlines"},
-		{"custom", "asynq:{custom}:deadlines"},
+		{"default", "asynq:{default}:lease"},
+		{"custom", "asynq:{custom}:lease"},
 	}
 
 	for _, tc := range tests {
-		got := DeadlinesKey(tc.qname)
+		got := LeaseKey(tc.qname)
 		if got != tc.want {
-			t.Errorf("DeadlinesKey(%q) = %q, want %q", tc.qname, got, tc.want)
+			t.Errorf("LeaseKey(%q) = %q, want %q", tc.qname, got, tc.want)
 		}
 	}
 }
@@ -139,6 +140,23 @@ func TestArchivedKey(t *testing.T) {
 	}
 }
 
+func TestCompletedKey(t *testing.T) {
+	tests := []struct {
+		qname string
+		want  string
+	}{
+		{"default", "asynq:{default}:completed"},
+		{"custom", "asynq:{custom}:completed"},
+	}
+
+	for _, tc := range tests {
+		got := CompletedKey(tc.qname)
+		if got != tc.want {
+			t.Errorf("CompletedKey(%q) = %q, want %q", tc.qname, got, tc.want)
+		}
+	}
+}
+
 func TestPausedKey(t *testing.T) {
 	tests := []struct {
 		qname string
@@ -156,6 +174,40 @@ func TestPausedKey(t *testing.T) {
 	}
 }
 
+func TestProcessedTotalKey(t *testing.T) {
+	tests := []struct {
+		qname string
+		want  string
+	}{
+		{"default", "asynq:{default}:processed"},
+		{"custom", "asynq:{custom}:processed"},
+	}
+
+	for _, tc := range tests {
+		got := ProcessedTotalKey(tc.qname)
+		if got != tc.want {
+			t.Errorf("ProcessedTotalKey(%q) = %q, want %q", tc.qname, got, tc.want)
+		}
+	}
+}
+
+func TestFailedTotalKey(t *testing.T) {
+	tests := []struct {
+		qname string
+		want  string
+	}{
+		{"default", "asynq:{default}:failed"},
+		{"custom", "asynq:{custom}:failed"},
+	}
+
+	for _, tc := range tests {
+		got := FailedTotalKey(tc.qname)
+		if got != tc.want {
+			t.Errorf("FailedTotalKey(%q) = %q, want %q", tc.qname, got, tc.want)
+		}
+	}
+}
+
 func TestProcessedKey(t *testing.T) {
 	tests := []struct {
 		qname string
@@ -343,32 +395,137 @@ func TestUniqueKey(t *testing.T) {
 	}
 }
 
+func TestGroupKey(t *testing.T) {
+	tests := []struct {
+		qname string
+		gkey  string
+		want  string
+	}{
+		{
+			qname: "default",
+			gkey:  "mygroup",
+			want:  "asynq:{default}:g:mygroup",
+		},
+		{
+			qname: "custom",
+			gkey:  "foo",
+			want:  "asynq:{custom}:g:foo",
+		},
+	}
+
+	for _, tc := range tests {
+		got := GroupKey(tc.qname, tc.gkey)
+		if got != tc.want {
+			t.Errorf("GroupKey(%q, %q) = %q, want %q", tc.qname, tc.gkey, got, tc.want)
+		}
+	}
+}
+
+func TestAggregationSetKey(t *testing.T) {
+	tests := []struct {
+		qname string
+		gname string
+		setID string
+		want  string
+	}{
+		{
+			qname: "default",
+			gname: "mygroup",
+			setID: "12345",
+			want:  "asynq:{default}:g:mygroup:12345",
+		},
+		{
+			qname: "custom",
+			gname: "foo",
+			setID: "98765",
+			want:  "asynq:{custom}:g:foo:98765",
+		},
+	}
+
+	for _, tc := range tests {
+		got := AggregationSetKey(tc.qname, tc.gname, tc.setID)
+		if got != tc.want {
+			t.Errorf("AggregationSetKey(%q, %q, %q) = %q, want %q", tc.qname, tc.gname, tc.setID, got, tc.want)
+		}
+	}
+}
+
+func TestAllGroups(t *testing.T) {
+	tests := []struct {
+		qname string
+		want  string
+	}{
+		{
+			qname: "default",
+			want:  "asynq:{default}:groups",
+		},
+		{
+			qname: "custom",
+			want:  "asynq:{custom}:groups",
+		},
+	}
+
+	for _, tc := range tests {
+		got := AllGroups(tc.qname)
+		if got != tc.want {
+			t.Errorf("AllGroups(%q) = %q, want %q", tc.qname, got, tc.want)
+		}
+	}
+}
+
+func TestAllAggregationSets(t *testing.T) {
+	tests := []struct {
+		qname string
+		want  string
+	}{
+		{
+			qname: "default",
+			want:  "asynq:{default}:aggregation_sets",
+		},
+		{
+			qname: "custom",
+			want:  "asynq:{custom}:aggregation_sets",
+		},
+	}
+
+	for _, tc := range tests {
+		got := AllAggregationSets(tc.qname)
+		if got != tc.want {
+			t.Errorf("AllAggregationSets(%q) = %q, want %q", tc.qname, got, tc.want)
+		}
+	}
+}
+
 func TestMessageEncoding(t *testing.T) {
-	id := uuid.New()
+	id := uuid.NewString()
 	tests := []struct {
 		in  *TaskMessage
 		out *TaskMessage
 	}{
 		{
 			in: &TaskMessage{
-				Type:     "task1",
-				Payload:  toBytes(map[string]interface{}{"a": 1, "b": "hello!", "c": true}),
-				ID:       id,
-				Queue:    "default",
-				Retry:    10,
-				Retried:  0,
-				Timeout:  1800,
-				Deadline: 1692311100,
+				Type:      "task1",
+				Payload:   toBytes(map[string]interface{}{"a": 1, "b": "hello!", "c": true}),
+				ID:        id,
+				Queue:     "default",
+				GroupKey:  "mygroup",
+				Retry:     10,
+				Retried:   0,
+				Timeout:   1800,
+				Deadline:  1692311100,
+				Retention: 3600,
 			},
 			out: &TaskMessage{
-				Type:     "task1",
-				Payload:  toBytes(map[string]interface{}{"a": json.Number("1"), "b": "hello!", "c": true}),
-				ID:       id,
-				Queue:    "default",
-				Retry:    10,
-				Retried:  0,
-				Timeout:  1800,
-				Deadline: 1692311100,
+				Type:      "task1",
+				Payload:   toBytes(map[string]interface{}{"a": json.Number("1"), "b": "hello!", "c": true}),
+				ID:        id,
+				Queue:     "default",
+				GroupKey:  "mygroup",
+				Retry:     10,
+				Retried:   0,
+				Timeout:   1800,
+				Deadline:  1692311100,
+				Retention: 3600,
 			},
 		},
 	}
@@ -530,30 +687,6 @@ func TestSchedulerEnqueueEventEncoding(t *testing.T) {
 	}
 }
 
-// Test for status being accessed by multiple goroutines.
-// Run with -race flag to check for data race.
-func TestStatusConcurrentAccess(t *testing.T) {
-	status := NewServerState()
-
-	var wg sync.WaitGroup
-
-	wg.Add(1)
-	go func() {
-		defer wg.Done()
-		status.Get()
-		_ = status.String()
-	}()
-
-	wg.Add(1)
-	go func() {
-		defer wg.Done()
-		status.Set(StateClosed)
-		_ = status.String()
-	}()
-
-	wg.Wait()
-}
-
 // Test for cancelations being accessed by multiple goroutines.
 // Run with -race flag to check for data race.
 func TestCancelationsConcurrentAccess(t *testing.T) {
@@ -598,3 +731,75 @@ func TestCancelationsConcurrentAccess(t *testing.T) {
 		t.Errorf("(*Cancelations).Get(%q) = _, true, want <nil>, false", key2)
 	}
 }
+
+func TestLeaseReset(t *testing.T) {
+	now := time.Now()
+	clock := timeutil.NewSimulatedClock(now)
+
+	l := NewLease(now.Add(30 * time.Second))
+	l.Clock = clock
+
+	// Check initial state
+	if !l.IsValid() {
+		t.Errorf("lease should be valid when expiration is set to a future time")
+	}
+	if want := now.Add(30 * time.Second); l.Deadline() != want {
+		t.Errorf("Lease.Deadline() = %v, want %v", l.Deadline(), want)
+	}
+
+	// Test Reset
+	if !l.Reset(now.Add(45 * time.Second)) {
+		t.Fatalf("Lease.Reset returned false when extending")
+	}
+	if want := now.Add(45 * time.Second); l.Deadline() != want {
+		t.Errorf("After Reset: Lease.Deadline() = %v, want %v", l.Deadline(), want)
+	}
+
+	clock.AdvanceTime(1 * time.Minute) // simulate lease expiration
+
+	if l.IsValid() {
+		t.Errorf("lease should be invalid after expiration")
+	}
+
+	// Reset should return false if lease is expired.
+	if l.Reset(time.Now().Add(20 * time.Second)) {
+		t.Errorf("Lease.Reset should return false after expiration")
+	}
+}
+
+func TestLeaseNotifyExpiration(t *testing.T) {
+	now := time.Now()
+	clock := timeutil.NewSimulatedClock(now)
+
+	l := NewLease(now.Add(30 * time.Second))
+	l.Clock = clock
+
+	select {
+	case <-l.Done():
+		t.Fatalf("Lease.Done() did not block")
+	default:
+	}
+
+	if l.NotifyExpiration() {
+		t.Fatalf("Lease.NotifyExpiration() should return false when lease is still valid")
+	}
+
+	clock.AdvanceTime(1 * time.Minute) // simulate lease expiration
+
+	if l.IsValid() {
+		t.Errorf("Lease should be invalid after expiration")
+	}
+	if !l.NotifyExpiration() {
+		t.Errorf("Lease.NotifyExpiration() return return true after expiration")
+	}
+	if !l.NotifyExpiration() {
+		t.Errorf("It should be leagal to call Lease.NotifyExpiration multiple times")
+	}
+
+	select {
+	case <-l.Done():
+		// expected
+	default:
+		t.Errorf("Lease.Done() blocked after call to Lease.NotifyExpiration()")
+	}
+}

internal/context/context.go

@@ -0,0 +1,87 @@
+// Copyright 2020 Kentaro Hibino. All rights reserved.
+// Use of this source code is governed by a MIT license
+// that can be found in the LICENSE file.
+
+package context
+
+import (
+	"context"
+	"time"
+
+	"github.com/hibiken/asynq/internal/base"
+)
+
+// A taskMetadata holds task scoped data to put in context.
+type taskMetadata struct {
+	id         string
+	maxRetry   int
+	retryCount int
+	qname      string
+}
+
+// ctxKey type is unexported to prevent collisions with context keys defined in
+// other packages.
+type ctxKey int
+
+// metadataCtxKey is the context key for the task metadata.
+// Its value of zero is arbitrary.
+const metadataCtxKey ctxKey = 0
+
+// New returns a context and cancel function for a given task message.
+func New(base context.Context, msg *base.TaskMessage, deadline time.Time) (context.Context, context.CancelFunc) {
+	metadata := taskMetadata{
+		id:         msg.ID,
+		maxRetry:   msg.Retry,
+		retryCount: msg.Retried,
+		qname:      msg.Queue,
+	}
+	ctx := context.WithValue(base, metadataCtxKey, metadata)
+	return context.WithDeadline(ctx, deadline)
+}
+
+// GetTaskID extracts a task ID from a context, if any.
+//
+// ID of a task is guaranteed to be unique.
+// ID of a task doesn't change if the task is being retried.
+func GetTaskID(ctx context.Context) (id string, ok bool) {
+	metadata, ok := ctx.Value(metadataCtxKey).(taskMetadata)
+	if !ok {
+		return "", false
+	}
+	return metadata.id, true
+}
+
+// GetRetryCount extracts retry count from a context, if any.
+//
+// Return value n indicates the number of times associated task has been
+// retried so far.
+func GetRetryCount(ctx context.Context) (n int, ok bool) {
+	metadata, ok := ctx.Value(metadataCtxKey).(taskMetadata)
+	if !ok {
+		return 0, false
+	}
+	return metadata.retryCount, true
+}
+
+// GetMaxRetry extracts maximum retry from a context, if any.
+//
+// Return value n indicates the maximum number of times the associated task
+// can be retried if ProcessTask returns a non-nil error.
+func GetMaxRetry(ctx context.Context) (n int, ok bool) {
+	metadata, ok := ctx.Value(metadataCtxKey).(taskMetadata)
+	if !ok {
+		return 0, false
+	}
+	return metadata.maxRetry, true
+}
+
+// GetQueueName extracts queue name from a context, if any.
+//
+// Return value qname indicates which queue the task was pulled from.
+func GetQueueName(ctx context.Context) (qname string, ok bool) {
+	metadata, ok := ctx.Value(metadataCtxKey).(taskMetadata)
+	if !ok {
+		return "", false
+	}
+	return metadata.qname, true
+}

internal/context/context_test.go

@@ -2,10 +2,11 @@
 // Use of this source code is governed by a MIT license
 // that can be found in the LICENSE file.
 
-package asynq
+package context
 
 import (
 	"context"
+	"fmt"
 	"testing"
 	"time"
 
@@ -24,12 +25,11 @@ func TestCreateContextWithFutureDeadline(t *testing.T) {
 	for _, tc := range tests {
 		msg := &base.TaskMessage{
 			Type:    "something",
-			ID:      uuid.New(),
+			ID:      uuid.NewString(),
 			Payload: nil,
 		}
 
-		ctx, cancel := createContext(msg, tc.deadline)
-
+		ctx, cancel := New(context.Background(), msg, tc.deadline)
 		select {
 		case x := <-ctx.Done():
 			t.Errorf("<-ctx.Done() == %v, want nothing (it should block)", x)
@@ -54,6 +54,53 @@ func TestCreateContextWithFutureDeadline(t *testing.T) {
 	}
 }
 
+func TestCreateContextWithBaseContext(t *testing.T) {
+	type ctxKey string
+	type ctxValue string
+	var key ctxKey = "key"
+	var value ctxValue = "value"
+
+	tests := []struct {
+		baseCtx  context.Context
+		validate func(ctx context.Context, t *testing.T) error
+	}{
+		{
+			baseCtx: context.WithValue(context.Background(), key, value),
+			validate: func(ctx context.Context, t *testing.T) error {
+				got, ok := ctx.Value(key).(ctxValue)
+				if !ok {
+					return fmt.Errorf("ctx.Value().(ctxValue) returned false, expected to be true")
+				}
+				if want := value; got != want {
+					return fmt.Errorf("ctx.Value().(ctxValue) returned unknown value (%v), expected to be %s", got, value)
+				}
+				return nil
+			},
+		},
+	}
+
+	for _, tc := range tests {
+		msg := &base.TaskMessage{
+			Type:    "something",
+			ID:      uuid.NewString(),
+			Payload: nil,
+		}
+
+		ctx, cancel := New(tc.baseCtx, msg, time.Now().Add(30*time.Minute))
+		defer cancel()
+
+		select {
+		case x := <-ctx.Done():
+			t.Errorf("<-ctx.Done() == %v, want nothing (it should block)", x)
+		default:
+		}
+
+		if err := tc.validate(ctx, t); err != nil {
+			t.Errorf("%v", err)
+		}
+	}
+}
+
 func TestCreateContextWithPastDeadline(t *testing.T) {
 	tests := []struct {
 		deadline time.Time
@@ -64,11 +111,11 @@ func TestCreateContextWithPastDeadline(t *testing.T) {
 	for _, tc := range tests {
 		msg := &base.TaskMessage{
 			Type:    "something",
-			ID:      uuid.New(),
+			ID:      uuid.NewString(),
 			Payload: nil,
 		}
 
-		ctx, cancel := createContext(msg, tc.deadline)
+		ctx, cancel := New(context.Background(), msg, tc.deadline)
 		defer cancel()
 
 		select {
@@ -92,21 +139,21 @@ func TestGetTaskMetadataFromContext(t *testing.T) {
 		desc string
 		msg  *base.TaskMessage
 	}{
-		{"with zero retried message", &base.TaskMessage{Type: "something", ID: uuid.New(), Retry: 25, Retried: 0, Timeout: 1800, Queue: "default"}},
-		{"with non-zero retried message", &base.TaskMessage{Type: "something", ID: uuid.New(), Retry: 10, Retried: 5, Timeout: 1800, Queue: "default"}},
-		{"with custom queue name", &base.TaskMessage{Type: "something", ID: uuid.New(), Retry: 25, Retried: 0, Timeout: 1800, Queue: "custom"}},
+		{"with zero retried message", &base.TaskMessage{Type: "something", ID: uuid.NewString(), Retry: 25, Retried: 0, Timeout: 1800, Queue: "default"}},
+		{"with non-zero retried message", &base.TaskMessage{Type: "something", ID: uuid.NewString(), Retry: 10, Retried: 5, Timeout: 1800, Queue: "default"}},
+		{"with custom queue name", &base.TaskMessage{Type: "something", ID: uuid.NewString(), Retry: 25, Retried: 0, Timeout: 1800, Queue: "custom"}},
 	}
 
 	for _, tc := range tests {
-		ctx, cancel := createContext(tc.msg, time.Now().Add(30*time.Minute))
+		ctx, cancel := New(context.Background(), tc.msg, time.Now().Add(30*time.Minute))
 		defer cancel()
 
 		id, ok := GetTaskID(ctx)
 		if !ok {
 			t.Errorf("%s: GetTaskID(ctx) returned ok == false", tc.desc)
 		}
-		if ok && id != tc.msg.ID.String() {
-			t.Errorf("%s: GetTaskID(ctx) returned id == %q, want %q", tc.desc, id, tc.msg.ID.String())
+		if ok && id != tc.msg.ID {
+			t.Errorf("%s: GetTaskID(ctx) returned id == %q, want %q", tc.desc, id, tc.msg.ID)
 		}
 
 		retried, ok := GetRetryCount(ctx)

internal/errors/errors.go

@@ -161,7 +161,7 @@ func CanonicalCode(err error) Code {
 }
 
 /******************************************
-    Domin Specific Error Types & Values
+    Domain Specific Error Types & Values
 *******************************************/
 
 var (
@@ -170,6 +170,9 @@ var (
 
 	// ErrDuplicateTask indicates that another task with the same unique key holds the uniqueness lock.
 	ErrDuplicateTask = errors.New("task already exists")
+
+	// ErrTaskIdConflict indicates that another task with the same task ID already exist
+	ErrTaskIdConflict = errors.New("task id conflicts with another task")
 )
 
 // TaskNotFoundError indicates that a task with the given ID does not exist
@@ -253,6 +256,21 @@ func IsRedisCommandError(err error) bool {
 	return As(err, &target)
 }
 
+// PanicError defines an error when occurred a panic error.
+type PanicError struct {
+	ErrMsg string
+}
+
+func (e *PanicError) Error() string {
+	return fmt.Sprintf("panic error cause by: %s", e.ErrMsg)
+}
+
+// IsPanicError reports whether any error in err's chain is of type PanicError.
+func IsPanicError(err error) bool {
+	var target *PanicError
+	return As(err, &target)
+}
+
 /*************************************************
     Standard Library errors package functions
 *************************************************/
@@ -260,26 +278,26 @@ func IsRedisCommandError(err error) bool {
 // New returns an error that formats as the given text.
 // Each call to New returns a distinct error value even if the text is identical.
 //
-// This function is the errors.New function from the standard libarary (https://golang.org/pkg/errors/#New).
-// It is exported from this package for import convinience.
+// This function is the errors.New function from the standard library (https://golang.org/pkg/errors/#New).
+// It is exported from this package for import convenience.
 func New(text string) error { return errors.New(text) }
 
 // Is reports whether any error in err's chain matches target.
 //
-// This function is the errors.Is function from the standard libarary (https://golang.org/pkg/errors/#Is).
-// It is exported from this package for import convinience.
+// This function is the errors.Is function from the standard library (https://golang.org/pkg/errors/#Is).
+// It is exported from this package for import convenience.
 func Is(err, target error) bool { return errors.Is(err, target) }
 
 // As finds the first error in err's chain that matches target, and if so, sets target to that error value and returns true.
 // Otherwise, it returns false.
 //
-// This function is the errors.As function from the standard libarary (https://golang.org/pkg/errors/#As).
-// It is exported from this package for import convinience.
+// This function is the errors.As function from the standard library (https://golang.org/pkg/errors/#As).
+// It is exported from this package for import convenience.
 func As(err error, target interface{}) bool { return errors.As(err, target) }
 
 // Unwrap returns the result of calling the Unwrap method on err, if err's type contains an Unwrap method returning error.
 // Otherwise, Unwrap returns nil.
 //
-// This function is the errors.Unwrap function from the standard libarary (https://golang.org/pkg/errors/#Unwrap).
-// It is exported from this package for import convinience.
+// This function is the errors.Unwrap function from the standard library (https://golang.org/pkg/errors/#Unwrap).
+// It is exported from this package for import convenience.
 func Unwrap(err error) error { return errors.Unwrap(err) }

internal/errors/errors_test.go

@@ -131,6 +131,12 @@ func TestErrorPredicates(t *testing.T) {
 			err:  E(Op("rdb.ArchiveTask"), NotFound, &QueueNotFoundError{Queue: "default"}),
 			want: true,
 		},
+		{
+			desc: "IsPanicError should detect presence of PanicError in err's chain",
+			fn:   IsPanicError,
+			err:  E(Op("unknown"), Unknown, &PanicError{ErrMsg: "Something went wrong"}),
+			want: true,
+		},
 	}
 
 	for _, tc := range tests {

internal/proto/asynq.pb.go

@@ -4,14 +4,13 @@
 
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
-// 	protoc-gen-go v1.25.0
-// 	protoc        v3.14.0
+// 	protoc-gen-go v1.34.2
+// 	protoc        v3.19.6
 // source: asynq.proto
 
 package proto
 
 import (
-	proto "github.com/golang/protobuf/proto"
 	protoreflect "google.golang.org/protobuf/reflect/protoreflect"
 	protoimpl "google.golang.org/protobuf/runtime/protoimpl"
 	timestamppb "google.golang.org/protobuf/types/known/timestamppb"
@@ -26,12 +25,9 @@ const (
 	_ = protoimpl.EnforceVersion(protoimpl.MaxVersion - 20)
 )
 
-// This is a compile-time assertion that a sufficiently up-to-date version
-// of the legacy proto package is being used.
-const _ = proto.ProtoPackageIsVersion4
-
 // TaskMessage is the internal representation of a task with additional
 // metadata fields.
+// Next ID: 15
 type TaskMessage struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
@@ -65,6 +61,17 @@ type TaskMessage struct {
 	// UniqueKey holds the redis key used for uniqueness lock for this task.
 	// Empty string indicates that no uniqueness lock was used.
 	UniqueKey string `protobuf:"bytes,10,opt,name=unique_key,json=uniqueKey,proto3" json:"unique_key,omitempty"`
+	// GroupKey is a name of the group used for task aggregation.
+	// This field is optional and empty value means no aggregation for the task.
+	GroupKey string `protobuf:"bytes,14,opt,name=group_key,json=groupKey,proto3" json:"group_key,omitempty"`
+	// Retention period specified in a number of seconds.
+	// The task will be stored in redis as a completed task until the TTL
+	// expires.
+	Retention int64 `protobuf:"varint,12,opt,name=retention,proto3" json:"retention,omitempty"`
+	// Time when the task completed in success in Unix time,
+	// the number of seconds elapsed since January 1, 1970 UTC.
+	// This field is populated if result_ttl > 0 upon completion.
+	CompletedAt int64 `protobuf:"varint,13,opt,name=completed_at,json=completedAt,proto3" json:"completed_at,omitempty"`
 }
 
 func (x *TaskMessage) Reset() {
@@ -176,6 +183,27 @@ func (x *TaskMessage) GetUniqueKey() string {
 	return ""
 }
 
+func (x *TaskMessage) GetGroupKey() string {
+	if x != nil {
+		return x.GroupKey
+	}
+	return ""
+}
+
+func (x *TaskMessage) GetRetention() int64 {
+	if x != nil {
+		return x.Retention
+	}
+	return 0
+}
+
+func (x *TaskMessage) GetCompletedAt() int64 {
+	if x != nil {
+		return x.CompletedAt
+	}
+	return 0
+}
+
 // ServerInfo holds information about a running server.
 type ServerInfo struct {
 	state         protoimpl.MessageState
@@ -592,7 +620,7 @@ var file_asynq_proto_rawDesc = []byte{
 	0x0a, 0x0b, 0x61, 0x73, 0x79, 0x6e, 0x71, 0x2e, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x12, 0x05, 0x61,
 	0x73, 0x79, 0x6e, 0x71, 0x1a, 0x1f, 0x67, 0x6f, 0x6f, 0x67, 0x6c, 0x65, 0x2f, 0x70, 0x72, 0x6f,
 	0x74, 0x6f, 0x62, 0x75, 0x66, 0x2f, 0x74, 0x69, 0x6d, 0x65, 0x73, 0x74, 0x61, 0x6d, 0x70, 0x2e,
-	0x70, 0x72, 0x6f, 0x74, 0x6f, 0x22, 0xa9, 0x02, 0x0a, 0x0b, 0x54, 0x61, 0x73, 0x6b, 0x4d, 0x65,
+	0x70, 0x72, 0x6f, 0x74, 0x6f, 0x22, 0x87, 0x03, 0x0a, 0x0b, 0x54, 0x61, 0x73, 0x6b, 0x4d, 0x65,
 	0x73, 0x73, 0x61, 0x67, 0x65, 0x12, 0x12, 0x0a, 0x04, 0x74, 0x79, 0x70, 0x65, 0x18, 0x01, 0x20,
 	0x01, 0x28, 0x09, 0x52, 0x04, 0x74, 0x79, 0x70, 0x65, 0x12, 0x18, 0x0a, 0x07, 0x70, 0x61, 0x79,
 	0x6c, 0x6f, 0x61, 0x64, 0x18, 0x02, 0x20, 0x01, 0x28, 0x0c, 0x52, 0x07, 0x70, 0x61, 0x79, 0x6c,
@@ -611,80 +639,86 @@ var file_asynq_proto_rawDesc = []byte{
 	0x6e, 0x65, 0x18, 0x09, 0x20, 0x01, 0x28, 0x03, 0x52, 0x08, 0x64, 0x65, 0x61, 0x64, 0x6c, 0x69,
 	0x6e, 0x65, 0x12, 0x1d, 0x0a, 0x0a, 0x75, 0x6e, 0x69, 0x71, 0x75, 0x65, 0x5f, 0x6b, 0x65, 0x79,
 	0x18, 0x0a, 0x20, 0x01, 0x28, 0x09, 0x52, 0x09, 0x75, 0x6e, 0x69, 0x71, 0x75, 0x65, 0x4b, 0x65,
-	0x79, 0x22, 0x8f, 0x03, 0x0a, 0x0a, 0x53, 0x65, 0x72, 0x76, 0x65, 0x72, 0x49, 0x6e, 0x66, 0x6f,
+	0x79, 0x12, 0x1b, 0x0a, 0x09, 0x67, 0x72, 0x6f, 0x75, 0x70, 0x5f, 0x6b, 0x65, 0x79, 0x18, 0x0e,
+	0x20, 0x01, 0x28, 0x09, 0x52, 0x08, 0x67, 0x72, 0x6f, 0x75, 0x70, 0x4b, 0x65, 0x79, 0x12, 0x1c,
+	0x0a, 0x09, 0x72, 0x65, 0x74, 0x65, 0x6e, 0x74, 0x69, 0x6f, 0x6e, 0x18, 0x0c, 0x20, 0x01, 0x28,
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+	0x66, 0x2e, 0x54, 0x69, 0x6d, 0x65, 0x73, 0x74, 0x61, 0x6d, 0x70, 0x52, 0x08, 0x64, 0x65, 0x61,
+	0x64, 0x6c, 0x69, 0x6e, 0x65, 0x22, 0xad, 0x02, 0x0a, 0x0e, 0x53, 0x63, 0x68, 0x65, 0x64, 0x75,
+	0x6c, 0x65, 0x72, 0x45, 0x6e, 0x74, 0x72, 0x79, 0x12, 0x0e, 0x0a, 0x02, 0x69, 0x64, 0x18, 0x01,
+	0x20, 0x01, 0x28, 0x09, 0x52, 0x02, 0x69, 0x64, 0x12, 0x12, 0x0a, 0x04, 0x73, 0x70, 0x65, 0x63,
+	0x18, 0x02, 0x20, 0x01, 0x28, 0x09, 0x52, 0x04, 0x73, 0x70, 0x65, 0x63, 0x12, 0x1b, 0x0a, 0x09,
+	0x74, 0x61, 0x73, 0x6b, 0x5f, 0x74, 0x79, 0x70, 0x65, 0x18, 0x03, 0x20, 0x01, 0x28, 0x09, 0x52,
+	0x08, 0x74, 0x61, 0x73, 0x6b, 0x54, 0x79, 0x70, 0x65, 0x12, 0x21, 0x0a, 0x0c, 0x74, 0x61, 0x73,
+	0x6b, 0x5f, 0x70, 0x61, 0x79, 0x6c, 0x6f, 0x61, 0x64, 0x18, 0x04, 0x20, 0x01, 0x28, 0x0c, 0x52,
+	0x0b, 0x74, 0x61, 0x73, 0x6b, 0x50, 0x61, 0x79, 0x6c, 0x6f, 0x61, 0x64, 0x12, 0x27, 0x0a, 0x0f,
+	0x65, 0x6e, 0x71, 0x75, 0x65, 0x75, 0x65, 0x5f, 0x6f, 0x70, 0x74, 0x69, 0x6f, 0x6e, 0x73, 0x18,
+	0x05, 0x20, 0x03, 0x28, 0x09, 0x52, 0x0e, 0x65, 0x6e, 0x71, 0x75, 0x65, 0x75, 0x65, 0x4f, 0x70,
+	0x74, 0x69, 0x6f, 0x6e, 0x73, 0x12, 0x46, 0x0a, 0x11, 0x6e, 0x65, 0x78, 0x74, 0x5f, 0x65, 0x6e,
+	0x71, 0x75, 0x65, 0x75, 0x65, 0x5f, 0x74, 0x69, 0x6d, 0x65, 0x18, 0x06, 0x20, 0x01, 0x28, 0x0b,
+	0x32, 0x1a, 0x2e, 0x67, 0x6f, 0x6f, 0x67, 0x6c, 0x65, 0x2e, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x62,
+	0x75, 0x66, 0x2e, 0x54, 0x69, 0x6d, 0x65, 0x73, 0x74, 0x61, 0x6d, 0x70, 0x52, 0x0f, 0x6e, 0x65,
+	0x78, 0x74, 0x45, 0x6e, 0x71, 0x75, 0x65, 0x75, 0x65, 0x54, 0x69, 0x6d, 0x65, 0x12, 0x46, 0x0a,
+	0x11, 0x70, 0x72, 0x65, 0x76, 0x5f, 0x65, 0x6e, 0x71, 0x75, 0x65, 0x75, 0x65, 0x5f, 0x74, 0x69,
+	0x6d, 0x65, 0x18, 0x07, 0x20, 0x01, 0x28, 0x0b, 0x32, 0x1a, 0x2e, 0x67, 0x6f, 0x6f, 0x67, 0x6c,
+	0x65, 0x2e, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x62, 0x75, 0x66, 0x2e, 0x54, 0x69, 0x6d, 0x65, 0x73,
+	0x74, 0x61, 0x6d, 0x70, 0x52, 0x0f, 0x70, 0x72, 0x65, 0x76, 0x45, 0x6e, 0x71, 0x75, 0x65, 0x75,
+	0x65, 0x54, 0x69, 0x6d, 0x65, 0x22, 0x6f, 0x0a, 0x15, 0x53, 0x63, 0x68, 0x65, 0x64, 0x75, 0x6c,
+	0x65, 0x72, 0x45, 0x6e, 0x71, 0x75, 0x65, 0x75, 0x65, 0x45, 0x76, 0x65, 0x6e, 0x74, 0x12, 0x17,
+	0x0a, 0x07, 0x74, 0x61, 0x73, 0x6b, 0x5f, 0x69, 0x64, 0x18, 0x01, 0x20, 0x01, 0x28, 0x09, 0x52,
+	0x06, 0x74, 0x61, 0x73, 0x6b, 0x49, 0x64, 0x12, 0x3d, 0x0a, 0x0c, 0x65, 0x6e, 0x71, 0x75, 0x65,
+	0x75, 0x65, 0x5f, 0x74, 0x69, 0x6d, 0x65, 0x18, 0x02, 0x20, 0x01, 0x28, 0x0b, 0x32, 0x1a, 0x2e,
+	0x67, 0x6f, 0x6f, 0x67, 0x6c, 0x65, 0x2e, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x62, 0x75, 0x66, 0x2e,
+	0x54, 0x69, 0x6d, 0x65, 0x73, 0x74, 0x61, 0x6d, 0x70, 0x52, 0x0b, 0x65, 0x6e, 0x71, 0x75, 0x65,
+	0x75, 0x65, 0x54, 0x69, 0x6d, 0x65, 0x42, 0x29, 0x5a, 0x27, 0x67, 0x69, 0x74, 0x68, 0x75, 0x62,
+	0x2e, 0x63, 0x6f, 0x6d, 0x2f, 0x68, 0x69, 0x62, 0x69, 0x6b, 0x65, 0x6e, 0x2f, 0x61, 0x73, 0x79,
+	0x6e, 0x71, 0x2f, 0x69, 0x6e, 0x74, 0x65, 0x72, 0x6e, 0x61, 0x6c, 0x2f, 0x70, 0x72, 0x6f, 0x74,
+	0x6f, 0x62, 0x06, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x33,
 }
 
 var (
@@ -700,7 +734,7 @@ func file_asynq_proto_rawDescGZIP() []byte {
 }
 
 var file_asynq_proto_msgTypes = make([]protoimpl.MessageInfo, 6)
-var file_asynq_proto_goTypes = []interface{}{
+var file_asynq_proto_goTypes = []any{
 	(*TaskMessage)(nil),           // 0: asynq.TaskMessage
 	(*ServerInfo)(nil),            // 1: asynq.ServerInfo
 	(*WorkerInfo)(nil),            // 2: asynq.WorkerInfo
@@ -730,7 +764,7 @@ func file_asynq_proto_init() {
 		return
 	}
 	if !protoimpl.UnsafeEnabled {
-		file_asynq_proto_msgTypes[0].Exporter = func(v interface{}, i int) interface{} {
+		file_asynq_proto_msgTypes[0].Exporter = func(v any, i int) any {
 			switch v := v.(*TaskMessage); i {
 			case 0:
 				return &v.state
@@ -742,7 +776,7 @@ func file_asynq_proto_init() {
 				return nil
 			}
 		}
-		file_asynq_proto_msgTypes[1].Exporter = func(v interface{}, i int) interface{} {
+		file_asynq_proto_msgTypes[1].Exporter = func(v any, i int) any {
 			switch v := v.(*ServerInfo); i {
 			case 0:
 				return &v.state
@@ -754,7 +788,7 @@ func file_asynq_proto_init() {
 				return nil
 			}
 		}
-		file_asynq_proto_msgTypes[2].Exporter = func(v interface{}, i int) interface{} {
+		file_asynq_proto_msgTypes[2].Exporter = func(v any, i int) any {
 			switch v := v.(*WorkerInfo); i {
 			case 0:
 				return &v.state
@@ -766,7 +800,7 @@ func file_asynq_proto_init() {
 				return nil
 			}
 		}
-		file_asynq_proto_msgTypes[3].Exporter = func(v interface{}, i int) interface{} {
+		file_asynq_proto_msgTypes[3].Exporter = func(v any, i int) any {
 			switch v := v.(*SchedulerEntry); i {
 			case 0:
 				return &v.state
@@ -778,7 +812,7 @@ func file_asynq_proto_init() {
 				return nil
 			}
 		}
-		file_asynq_proto_msgTypes[4].Exporter = func(v interface{}, i int) interface{} {
+		file_asynq_proto_msgTypes[4].Exporter = func(v any, i int) any {
 			switch v := v.(*SchedulerEnqueueEvent); i {
 			case 0:
 				return &v.state

internal/proto/asynq.proto

@@ -11,6 +11,7 @@ option go_package = "github.com/hibiken/asynq/internal/proto";
 
 // TaskMessage is the internal representation of a task with additional
 // metadata fields.
+// Next ID: 15
 message TaskMessage {
 	// Type indicates the kind of the task to be performed.
   string type = 1;
@@ -51,6 +52,19 @@ message TaskMessage {
 	// Empty string indicates that no uniqueness lock was used.
   string unique_key = 10;
 
+  // GroupKey is a name of the group used for task aggregation.
+  // This field is optional and empty value means no aggregation for the task.
+  string group_key = 14;
+
+  // Retention period specified in a number of seconds.
+  // The task will be stored in redis as a completed task until the TTL
+  // expires.
+  int64 retention = 12;
+
+  // Time when the task completed in success in Unix time,
+  // the number of seconds elapsed since January 1, 1970 UTC.
+  // This field is populated if result_ttl > 0 upon completion.
+  int64 completed_at = 13;
 };
 
 // ServerInfo holds information about a running server.
@@ -151,4 +165,4 @@ message SchedulerEnqueueEvent {
 
 	// Time the task was enqueued.
   google.protobuf.Timestamp enqueue_time = 2;
-};
+};

internal/rdb/benchmark_test.go

@@ -5,25 +5,27 @@
 package rdb
 
 import (
+	"context"
 	"fmt"
 	"testing"
 	"time"
 
-	"github.com/hibiken/asynq/internal/asynqtest"
 	"github.com/hibiken/asynq/internal/base"
+	"github.com/hibiken/asynq/internal/testutil"
 )
 
 func BenchmarkEnqueue(b *testing.B) {
 	r := setup(b)
-	msg := asynqtest.NewTaskMessage("task1", nil)
+	ctx := context.Background()
+	msg := testutil.NewTaskMessage("task1", nil)
 	b.ResetTimer()
 
 	for i := 0; i < b.N; i++ {
 		b.StopTimer()
-		asynqtest.FlushDB(b, r.client)
+		testutil.FlushDB(b, r.client)
 		b.StartTimer()
 
-		if err := r.Enqueue(msg); err != nil {
+		if err := r.Enqueue(ctx, msg); err != nil {
 			b.Fatalf("Enqueue failed: %v", err)
 		}
 	}
@@ -31,6 +33,7 @@ func BenchmarkEnqueue(b *testing.B) {
 
 func BenchmarkEnqueueUnique(b *testing.B) {
 	r := setup(b)
+	ctx := context.Background()
 	msg := &base.TaskMessage{
 		Type:      "task1",
 		Payload:   nil,
@@ -42,10 +45,10 @@ func BenchmarkEnqueueUnique(b *testing.B) {
 
 	for i := 0; i < b.N; i++ {
 		b.StopTimer()
-		asynqtest.FlushDB(b, r.client)
+		testutil.FlushDB(b, r.client)
 		b.StartTimer()
 
-		if err := r.EnqueueUnique(msg, uniqueTTL); err != nil {
+		if err := r.EnqueueUnique(ctx, msg, uniqueTTL); err != nil {
 			b.Fatalf("EnqueueUnique failed: %v", err)
 		}
 	}
@@ -53,16 +56,17 @@ func BenchmarkEnqueueUnique(b *testing.B) {
 
 func BenchmarkSchedule(b *testing.B) {
 	r := setup(b)
-	msg := asynqtest.NewTaskMessage("task1", nil)
+	ctx := context.Background()
+	msg := testutil.NewTaskMessage("task1", nil)
 	processAt := time.Now().Add(3 * time.Minute)
 	b.ResetTimer()
 
 	for i := 0; i < b.N; i++ {
 		b.StopTimer()
-		asynqtest.FlushDB(b, r.client)
+		testutil.FlushDB(b, r.client)
 		b.StartTimer()
 
-		if err := r.Schedule(msg, processAt); err != nil {
+		if err := r.Schedule(ctx, msg, processAt); err != nil {
 			b.Fatalf("Schedule failed: %v", err)
 		}
 	}
@@ -70,6 +74,7 @@ func BenchmarkSchedule(b *testing.B) {
 
 func BenchmarkScheduleUnique(b *testing.B) {
 	r := setup(b)
+	ctx := context.Background()
 	msg := &base.TaskMessage{
 		Type:      "task1",
 		Payload:   nil,
@@ -82,10 +87,10 @@ func BenchmarkScheduleUnique(b *testing.B) {
 
 	for i := 0; i < b.N; i++ {
 		b.StopTimer()
-		asynqtest.FlushDB(b, r.client)
+		testutil.FlushDB(b, r.client)
 		b.StartTimer()
 
-		if err := r.ScheduleUnique(msg, processAt, uniqueTTL); err != nil {
+		if err := r.ScheduleUnique(ctx, msg, processAt, uniqueTTL); err != nil {
 			b.Fatalf("EnqueueUnique failed: %v", err)
 		}
 	}
@@ -93,15 +98,16 @@ func BenchmarkScheduleUnique(b *testing.B) {
 
 func BenchmarkDequeueSingleQueue(b *testing.B) {
 	r := setup(b)
+	ctx := context.Background()
 	b.ResetTimer()
 
 	for i := 0; i < b.N; i++ {
 		b.StopTimer()
-		asynqtest.FlushDB(b, r.client)
+		testutil.FlushDB(b, r.client)
 		for i := 0; i < 10; i++ {
-			m := asynqtest.NewTaskMessageWithQueue(
+			m := testutil.NewTaskMessageWithQueue(
 				fmt.Sprintf("task%d", i), nil, base.DefaultQueueName)
-			if err := r.Enqueue(m); err != nil {
+			if err := r.Enqueue(ctx, m); err != nil {
 				b.Fatalf("Enqueue failed: %v", err)
 			}
 		}
@@ -116,16 +122,17 @@ func BenchmarkDequeueSingleQueue(b *testing.B) {
 func BenchmarkDequeueMultipleQueues(b *testing.B) {
 	qnames := []string{"critical", "default", "low"}
 	r := setup(b)
+	ctx := context.Background()
 	b.ResetTimer()
 
 	for i := 0; i < b.N; i++ {
 		b.StopTimer()
-		asynqtest.FlushDB(b, r.client)
+		testutil.FlushDB(b, r.client)
 		for i := 0; i < 10; i++ {
 			for _, qname := range qnames {
-				m := asynqtest.NewTaskMessageWithQueue(
+				m := testutil.NewTaskMessageWithQueue(
 					fmt.Sprintf("%s_task%d", qname, i), nil, qname)
-				if err := r.Enqueue(m); err != nil {
+				if err := r.Enqueue(ctx, m); err != nil {
 					b.Fatalf("Enqueue failed: %v", err)
 				}
 			}
@@ -140,25 +147,26 @@ func BenchmarkDequeueMultipleQueues(b *testing.B) {
 
 func BenchmarkDone(b *testing.B) {
 	r := setup(b)
-	m1 := asynqtest.NewTaskMessage("task1", nil)
-	m2 := asynqtest.NewTaskMessage("task2", nil)
-	m3 := asynqtest.NewTaskMessage("task3", nil)
+	m1 := testutil.NewTaskMessage("task1", nil)
+	m2 := testutil.NewTaskMessage("task2", nil)
+	m3 := testutil.NewTaskMessage("task3", nil)
 	msgs := []*base.TaskMessage{m1, m2, m3}
 	zs := []base.Z{
 		{Message: m1, Score: time.Now().Add(10 * time.Second).Unix()},
 		{Message: m2, Score: time.Now().Add(20 * time.Second).Unix()},
 		{Message: m3, Score: time.Now().Add(30 * time.Second).Unix()},
 	}
+	ctx := context.Background()
 	b.ResetTimer()
 
 	for i := 0; i < b.N; i++ {
 		b.StopTimer()
-		asynqtest.FlushDB(b, r.client)
-		asynqtest.SeedActiveQueue(b, r.client, msgs, base.DefaultQueueName)
-		asynqtest.SeedDeadlines(b, r.client, zs, base.DefaultQueueName)
+		testutil.FlushDB(b, r.client)
+		testutil.SeedActiveQueue(b, r.client, msgs, base.DefaultQueueName)
+		testutil.SeedLease(b, r.client, zs, base.DefaultQueueName)
 		b.StartTimer()
 
-		if err := r.Done(msgs[0]); err != nil {
+		if err := r.Done(ctx, msgs[0]); err != nil {
 			b.Fatalf("Done failed: %v", err)
 		}
 	}
@@ -166,25 +174,26 @@ func BenchmarkDone(b *testing.B) {
 
 func BenchmarkRetry(b *testing.B) {
 	r := setup(b)
-	m1 := asynqtest.NewTaskMessage("task1", nil)
-	m2 := asynqtest.NewTaskMessage("task2", nil)
-	m3 := asynqtest.NewTaskMessage("task3", nil)
+	m1 := testutil.NewTaskMessage("task1", nil)
+	m2 := testutil.NewTaskMessage("task2", nil)
+	m3 := testutil.NewTaskMessage("task3", nil)
 	msgs := []*base.TaskMessage{m1, m2, m3}
 	zs := []base.Z{
 		{Message: m1, Score: time.Now().Add(10 * time.Second).Unix()},
 		{Message: m2, Score: time.Now().Add(20 * time.Second).Unix()},
 		{Message: m3, Score: time.Now().Add(30 * time.Second).Unix()},
 	}
+	ctx := context.Background()
 	b.ResetTimer()
 
 	for i := 0; i < b.N; i++ {
 		b.StopTimer()
-		asynqtest.FlushDB(b, r.client)
-		asynqtest.SeedActiveQueue(b, r.client, msgs, base.DefaultQueueName)
-		asynqtest.SeedDeadlines(b, r.client, zs, base.DefaultQueueName)
+		testutil.FlushDB(b, r.client)
+		testutil.SeedActiveQueue(b, r.client, msgs, base.DefaultQueueName)
+		testutil.SeedLease(b, r.client, zs, base.DefaultQueueName)
 		b.StartTimer()
 
-		if err := r.Retry(msgs[0], time.Now().Add(1*time.Minute), "error"); err != nil {
+		if err := r.Retry(ctx, msgs[0], time.Now().Add(1*time.Minute), "error", true /*isFailure*/); err != nil {
 			b.Fatalf("Retry failed: %v", err)
 		}
 	}
@@ -192,25 +201,26 @@ func BenchmarkRetry(b *testing.B) {
 
 func BenchmarkArchive(b *testing.B) {
 	r := setup(b)
-	m1 := asynqtest.NewTaskMessage("task1", nil)
-	m2 := asynqtest.NewTaskMessage("task2", nil)
-	m3 := asynqtest.NewTaskMessage("task3", nil)
+	m1 := testutil.NewTaskMessage("task1", nil)
+	m2 := testutil.NewTaskMessage("task2", nil)
+	m3 := testutil.NewTaskMessage("task3", nil)
 	msgs := []*base.TaskMessage{m1, m2, m3}
 	zs := []base.Z{
 		{Message: m1, Score: time.Now().Add(10 * time.Second).Unix()},
 		{Message: m2, Score: time.Now().Add(20 * time.Second).Unix()},
 		{Message: m3, Score: time.Now().Add(30 * time.Second).Unix()},
 	}
+	ctx := context.Background()
 	b.ResetTimer()
 
 	for i := 0; i < b.N; i++ {
 		b.StopTimer()
-		asynqtest.FlushDB(b, r.client)
-		asynqtest.SeedActiveQueue(b, r.client, msgs, base.DefaultQueueName)
-		asynqtest.SeedDeadlines(b, r.client, zs, base.DefaultQueueName)
+		testutil.FlushDB(b, r.client)
+		testutil.SeedActiveQueue(b, r.client, msgs, base.DefaultQueueName)
+		testutil.SeedLease(b, r.client, zs, base.DefaultQueueName)
 		b.StartTimer()
 
-		if err := r.Archive(msgs[0], "error"); err != nil {
+		if err := r.Archive(ctx, msgs[0], "error"); err != nil {
 			b.Fatalf("Archive failed: %v", err)
 		}
 	}
@@ -218,25 +228,26 @@ func BenchmarkArchive(b *testing.B) {
 
 func BenchmarkRequeue(b *testing.B) {
 	r := setup(b)
-	m1 := asynqtest.NewTaskMessage("task1", nil)
-	m2 := asynqtest.NewTaskMessage("task2", nil)
-	m3 := asynqtest.NewTaskMessage("task3", nil)
+	m1 := testutil.NewTaskMessage("task1", nil)
+	m2 := testutil.NewTaskMessage("task2", nil)
+	m3 := testutil.NewTaskMessage("task3", nil)
 	msgs := []*base.TaskMessage{m1, m2, m3}
 	zs := []base.Z{
 		{Message: m1, Score: time.Now().Add(10 * time.Second).Unix()},
 		{Message: m2, Score: time.Now().Add(20 * time.Second).Unix()},
 		{Message: m3, Score: time.Now().Add(30 * time.Second).Unix()},
 	}
+	ctx := context.Background()
 	b.ResetTimer()
 
 	for i := 0; i < b.N; i++ {
 		b.StopTimer()
-		asynqtest.FlushDB(b, r.client)
-		asynqtest.SeedActiveQueue(b, r.client, msgs, base.DefaultQueueName)
-		asynqtest.SeedDeadlines(b, r.client, zs, base.DefaultQueueName)
+		testutil.FlushDB(b, r.client)
+		testutil.SeedActiveQueue(b, r.client, msgs, base.DefaultQueueName)
+		testutil.SeedLease(b, r.client, zs, base.DefaultQueueName)
 		b.StartTimer()
 
-		if err := r.Requeue(msgs[0]); err != nil {
+		if err := r.Requeue(ctx, msgs[0]); err != nil {
 			b.Fatalf("Requeue failed: %v", err)
 		}
 	}
@@ -247,7 +258,7 @@ func BenchmarkCheckAndEnqueue(b *testing.B) {
 	now := time.Now()
 	var zs []base.Z
 	for i := -100; i < 100; i++ {
-		msg := asynqtest.NewTaskMessage(fmt.Sprintf("task%d", i), nil)
+		msg := testutil.NewTaskMessage(fmt.Sprintf("task%d", i), nil)
 		score := now.Add(time.Duration(i) * time.Second).Unix()
 		zs = append(zs, base.Z{Message: msg, Score: score})
 	}
@@ -255,8 +266,8 @@ func BenchmarkCheckAndEnqueue(b *testing.B) {
 
 	for i := 0; i < b.N; i++ {
 		b.StopTimer()
-		asynqtest.FlushDB(b, r.client)
-		asynqtest.SeedScheduledQueue(b, r.client, zs, base.DefaultQueueName)
+		testutil.FlushDB(b, r.client)
+		testutil.SeedScheduledQueue(b, r.client, zs, base.DefaultQueueName)
 		b.StartTimer()
 
 		if err := r.ForwardIfReady(base.DefaultQueueName); err != nil {

internal/testbroker/testbroker.go

@@ -6,15 +6,16 @@
 package testbroker
 
 import (
+	"context"
 	"errors"
 	"sync"
 	"time"
 
-	"github.com/go-redis/redis/v7"
 	"github.com/hibiken/asynq/internal/base"
+	"github.com/redis/go-redis/v9"
 )
 
-var errRedisDown = errors.New("asynqtest: redis is down")
+var errRedisDown = errors.New("testutil: redis is down")
 
 // TestBroker is a broker implementation which enables
 // to simulate Redis failure in tests.
@@ -45,22 +46,22 @@ func (tb *TestBroker) Wakeup() {
 	tb.sleeping = false
 }
 
-func (tb *TestBroker) Enqueue(msg *base.TaskMessage) error {
+func (tb *TestBroker) Enqueue(ctx context.Context, msg *base.TaskMessage) error {
 	tb.mu.Lock()
 	defer tb.mu.Unlock()
 	if tb.sleeping {
 		return errRedisDown
 	}
-	return tb.real.Enqueue(msg)
+	return tb.real.Enqueue(ctx, msg)
 }
 
-func (tb *TestBroker) EnqueueUnique(msg *base.TaskMessage, ttl time.Duration) error {
+func (tb *TestBroker) EnqueueUnique(ctx context.Context, msg *base.TaskMessage, ttl time.Duration) error {
 	tb.mu.Lock()
 	defer tb.mu.Unlock()
 	if tb.sleeping {
 		return errRedisDown
 	}
-	return tb.real.EnqueueUnique(msg, ttl)
+	return tb.real.EnqueueUnique(ctx, msg, ttl)
 }
 
 func (tb *TestBroker) Dequeue(qnames ...string) (*base.TaskMessage, time.Time, error) {
@@ -72,58 +73,67 @@ func (tb *TestBroker) Dequeue(qnames ...string) (*base.TaskMessage, time.Time, e
 	return tb.real.Dequeue(qnames...)
 }
 
-func (tb *TestBroker) Done(msg *base.TaskMessage) error {
+func (tb *TestBroker) Done(ctx context.Context, msg *base.TaskMessage) error {
 	tb.mu.Lock()
 	defer tb.mu.Unlock()
 	if tb.sleeping {
 		return errRedisDown
 	}
-	return tb.real.Done(msg)
+	return tb.real.Done(ctx, msg)
 }
 
-func (tb *TestBroker) Requeue(msg *base.TaskMessage) error {
+func (tb *TestBroker) MarkAsComplete(ctx context.Context, msg *base.TaskMessage) error {
 	tb.mu.Lock()
 	defer tb.mu.Unlock()
 	if tb.sleeping {
 		return errRedisDown
 	}
-	return tb.real.Requeue(msg)
+	return tb.real.MarkAsComplete(ctx, msg)
 }
 
-func (tb *TestBroker) Schedule(msg *base.TaskMessage, processAt time.Time) error {
+func (tb *TestBroker) Requeue(ctx context.Context, msg *base.TaskMessage) error {
 	tb.mu.Lock()
 	defer tb.mu.Unlock()
 	if tb.sleeping {
 		return errRedisDown
 	}
-	return tb.real.Schedule(msg, processAt)
+	return tb.real.Requeue(ctx, msg)
 }
 
-func (tb *TestBroker) ScheduleUnique(msg *base.TaskMessage, processAt time.Time, ttl time.Duration) error {
+func (tb *TestBroker) Schedule(ctx context.Context, msg *base.TaskMessage, processAt time.Time) error {
 	tb.mu.Lock()
 	defer tb.mu.Unlock()
 	if tb.sleeping {
 		return errRedisDown
 	}
-	return tb.real.ScheduleUnique(msg, processAt, ttl)
+	return tb.real.Schedule(ctx, msg, processAt)
 }
 
-func (tb *TestBroker) Retry(msg *base.TaskMessage, processAt time.Time, errMsg string) error {
+func (tb *TestBroker) ScheduleUnique(ctx context.Context, msg *base.TaskMessage, processAt time.Time, ttl time.Duration) error {
 	tb.mu.Lock()
 	defer tb.mu.Unlock()
 	if tb.sleeping {
 		return errRedisDown
 	}
-	return tb.real.Retry(msg, processAt, errMsg)
+	return tb.real.ScheduleUnique(ctx, msg, processAt, ttl)
 }
 
-func (tb *TestBroker) Archive(msg *base.TaskMessage, errMsg string) error {
+func (tb *TestBroker) Retry(ctx context.Context, msg *base.TaskMessage, processAt time.Time, errMsg string, isFailure bool) error {
 	tb.mu.Lock()
 	defer tb.mu.Unlock()
 	if tb.sleeping {
 		return errRedisDown
 	}
-	return tb.real.Archive(msg, errMsg)
+	return tb.real.Retry(ctx, msg, processAt, errMsg, isFailure)
+}
+
+func (tb *TestBroker) Archive(ctx context.Context, msg *base.TaskMessage, errMsg string) error {
+	tb.mu.Lock()
+	defer tb.mu.Unlock()
+	if tb.sleeping {
+		return errRedisDown
+	}
+	return tb.real.Archive(ctx, msg, errMsg)
 }
 
 func (tb *TestBroker) ForwardIfReady(qnames ...string) error {
@@ -135,13 +145,31 @@ func (tb *TestBroker) ForwardIfReady(qnames ...string) error {
 	return tb.real.ForwardIfReady(qnames...)
 }
 
-func (tb *TestBroker) ListDeadlineExceeded(deadline time.Time, qnames ...string) ([]*base.TaskMessage, error) {
+func (tb *TestBroker) DeleteExpiredCompletedTasks(qname string, batchSize int) error {
+	tb.mu.Lock()
+	defer tb.mu.Unlock()
+	if tb.sleeping {
+		return errRedisDown
+	}
+	return tb.real.DeleteExpiredCompletedTasks(qname, batchSize)
+}
+
+func (tb *TestBroker) ListLeaseExpired(cutoff time.Time, qnames ...string) ([]*base.TaskMessage, error) {
 	tb.mu.Lock()
 	defer tb.mu.Unlock()
 	if tb.sleeping {
 		return nil, errRedisDown
 	}
-	return tb.real.ListDeadlineExceeded(deadline, qnames...)
+	return tb.real.ListLeaseExpired(cutoff, qnames...)
+}
+
+func (tb *TestBroker) ExtendLease(qname string, ids ...string) (time.Time, error) {
+	tb.mu.Lock()
+	defer tb.mu.Unlock()
+	if tb.sleeping {
+		return time.Time{}, errRedisDown
+	}
+	return tb.real.ExtendLease(qname, ids...)
 }
 
 func (tb *TestBroker) WriteServerState(info *base.ServerInfo, workers []*base.WorkerInfo, ttl time.Duration) error {
@@ -180,6 +208,15 @@ func (tb *TestBroker) PublishCancelation(id string) error {
 	return tb.real.PublishCancelation(id)
 }
 
+func (tb *TestBroker) WriteResult(qname, id string, data []byte) (int, error) {
+	tb.mu.Lock()
+	defer tb.mu.Unlock()
+	if tb.sleeping {
+		return 0, errRedisDown
+	}
+	return tb.real.WriteResult(qname, id, data)
+}
+
 func (tb *TestBroker) Ping() error {
 	tb.mu.Lock()
 	defer tb.mu.Unlock()
@@ -197,3 +234,66 @@ func (tb *TestBroker) Close() error {
 	}
 	return tb.real.Close()
 }
+
+func (tb *TestBroker) AddToGroup(ctx context.Context, msg *base.TaskMessage, gname string) error {
+	tb.mu.Lock()
+	defer tb.mu.Unlock()
+	if tb.sleeping {
+		return errRedisDown
+	}
+	return tb.real.AddToGroup(ctx, msg, gname)
+}
+
+func (tb *TestBroker) AddToGroupUnique(ctx context.Context, msg *base.TaskMessage, gname string, ttl time.Duration) error {
+	tb.mu.Lock()
+	defer tb.mu.Unlock()
+	if tb.sleeping {
+		return errRedisDown
+	}
+	return tb.real.AddToGroupUnique(ctx, msg, gname, ttl)
+}
+
+func (tb *TestBroker) ListGroups(qname string) ([]string, error) {
+	tb.mu.Lock()
+	defer tb.mu.Unlock()
+	if tb.sleeping {
+		return nil, errRedisDown
+	}
+	return tb.real.ListGroups(qname)
+}
+
+func (tb *TestBroker) AggregationCheck(qname, gname string, t time.Time, gracePeriod, maxDelay time.Duration, maxSize int) (aggregationSetID string, err error) {
+	tb.mu.Lock()
+	defer tb.mu.Unlock()
+	if tb.sleeping {
+		return "", errRedisDown
+	}
+	return tb.real.AggregationCheck(qname, gname, t, gracePeriod, maxDelay, maxSize)
+}
+
+func (tb *TestBroker) ReadAggregationSet(qname, gname, aggregationSetID string) ([]*base.TaskMessage, time.Time, error) {
+	tb.mu.Lock()
+	defer tb.mu.Unlock()
+	if tb.sleeping {
+		return nil, time.Time{}, errRedisDown
+	}
+	return tb.real.ReadAggregationSet(qname, gname, aggregationSetID)
+}
+
+func (tb *TestBroker) DeleteAggregationSet(ctx context.Context, qname, gname, aggregationSetID string) error {
+	tb.mu.Lock()
+	defer tb.mu.Unlock()
+	if tb.sleeping {
+		return errRedisDown
+	}
+	return tb.real.DeleteAggregationSet(ctx, qname, gname, aggregationSetID)
+}
+
+func (tb *TestBroker) ReclaimStaleAggregationSets(qname string) error {
+	tb.mu.Lock()
+	defer tb.mu.Unlock()
+	if tb.sleeping {
+		return errRedisDown
+	}
+	return tb.real.ReclaimStaleAggregationSets(qname)
+}

internal/testutil/builder.go

@@ -0,0 +1,84 @@
+// Copyright 2022 Kentaro Hibino. All rights reserved.
+// Use of this source code is governed by a MIT license
+// that can be found in the LICENSE file.
+
+package testutil
+
+import (
+	"time"
+
+	"github.com/google/uuid"
+	"github.com/hibiken/asynq/internal/base"
+)
+
+func makeDefaultTaskMessage() *base.TaskMessage {
+	return &base.TaskMessage{
+		ID:       uuid.NewString(),
+		Type:     "default_task",
+		Queue:    "default",
+		Retry:    25,
+		Timeout:  1800, // default timeout of 30 mins
+		Deadline: 0,    // no deadline
+	}
+}
+
+type TaskMessageBuilder struct {
+	msg *base.TaskMessage
+}
+
+func NewTaskMessageBuilder() *TaskMessageBuilder {
+	return &TaskMessageBuilder{}
+}
+
+func (b *TaskMessageBuilder) lazyInit() {
+	if b.msg == nil {
+		b.msg = makeDefaultTaskMessage()
+	}
+}
+
+func (b *TaskMessageBuilder) Build() *base.TaskMessage {
+	b.lazyInit()
+	return b.msg
+}
+
+func (b *TaskMessageBuilder) SetType(typename string) *TaskMessageBuilder {
+	b.lazyInit()
+	b.msg.Type = typename
+	return b
+}
+
+func (b *TaskMessageBuilder) SetPayload(payload []byte) *TaskMessageBuilder {
+	b.lazyInit()
+	b.msg.Payload = payload
+	return b
+}
+
+func (b *TaskMessageBuilder) SetQueue(qname string) *TaskMessageBuilder {
+	b.lazyInit()
+	b.msg.Queue = qname
+	return b
+}
+
+func (b *TaskMessageBuilder) SetRetry(n int) *TaskMessageBuilder {
+	b.lazyInit()
+	b.msg.Retry = n
+	return b
+}
+
+func (b *TaskMessageBuilder) SetTimeout(timeout time.Duration) *TaskMessageBuilder {
+	b.lazyInit()
+	b.msg.Timeout = int64(timeout.Seconds())
+	return b
+}
+
+func (b *TaskMessageBuilder) SetDeadline(deadline time.Time) *TaskMessageBuilder {
+	b.lazyInit()
+	b.msg.Deadline = deadline.Unix()
+	return b
+}
+
+func (b *TaskMessageBuilder) SetGroup(gname string) *TaskMessageBuilder {
+	b.lazyInit()
+	b.msg.GroupKey = gname
+	return b
+}

internal/testutil/builder_test.go

@@ -0,0 +1,94 @@
+// Copyright 2022 Kentaro Hibino. All rights reserved.
+// Use of this source code is governed by a MIT license
+// that can be found in the LICENSE file.
+
+package testutil
+
+import (
+	"testing"
+	"time"
+
+	"github.com/google/go-cmp/cmp"
+	"github.com/google/go-cmp/cmp/cmpopts"
+	"github.com/hibiken/asynq/internal/base"
+)
+
+func TestTaskMessageBuilder(t *testing.T) {
+	tests := []struct {
+		desc string
+		ops  func(b *TaskMessageBuilder) // operations to perform on the builder
+		want *base.TaskMessage
+	}{
+		{
+			desc: "zero value and build",
+			ops:  nil,
+			want: &base.TaskMessage{
+				Type:     "default_task",
+				Queue:    "default",
+				Payload:  nil,
+				Retry:    25,
+				Timeout:  1800, // 30m
+				Deadline: 0,
+			},
+		},
+		{
+			desc: "with type, payload, and queue",
+			ops: func(b *TaskMessageBuilder) {
+				b.SetType("foo").SetPayload([]byte("hello")).SetQueue("myqueue")
+			},
+			want: &base.TaskMessage{
+				Type:     "foo",
+				Queue:    "myqueue",
+				Payload:  []byte("hello"),
+				Retry:    25,
+				Timeout:  1800, // 30m
+				Deadline: 0,
+			},
+		},
+		{
+			desc: "with retry, timeout, and deadline",
+			ops: func(b *TaskMessageBuilder) {
+				b.SetRetry(1).
+					SetTimeout(20 * time.Second).
+					SetDeadline(time.Date(2017, 3, 6, 0, 0, 0, 0, time.UTC))
+			},
+			want: &base.TaskMessage{
+				Type:     "default_task",
+				Queue:    "default",
+				Payload:  nil,
+				Retry:    1,
+				Timeout:  20,
+				Deadline: time.Date(2017, 3, 6, 0, 0, 0, 0, time.UTC).Unix(),
+			},
+		},
+		{
+			desc: "with group",
+			ops: func(b *TaskMessageBuilder) {
+				b.SetGroup("mygroup")
+			},
+			want: &base.TaskMessage{
+				Type:     "default_task",
+				Queue:    "default",
+				Payload:  nil,
+				Retry:    25,
+				Timeout:  1800,
+				Deadline: 0,
+				GroupKey: "mygroup",
+			},
+		},
+	}
+	cmpOpts := []cmp.Option{cmpopts.IgnoreFields(base.TaskMessage{}, "ID")}
+
+	for _, tc := range tests {
+		var b TaskMessageBuilder
+		if tc.ops != nil {
+			tc.ops(&b)
+		}
+
+		got := b.Build()
+		if diff := cmp.Diff(tc.want, got, cmpOpts...); diff != "" {
+			t.Errorf("%s: TaskMessageBuilder.Build() = %+v, want %+v;\n(-want,+got)\n%s",
+				tc.desc, got, tc.want, diff)
+		}
+	}
+}

internal/testutil/testutil.go

@@ -2,21 +2,23 @@
 // Use of this source code is governed by a MIT license
 // that can be found in the LICENSE file.
 
-// Package asynqtest defines test helpers for asynq and its internal packages.
-package asynqtest
+// Package testutil defines test helpers for asynq and its internal packages.
+package testutil
 
 import (
+	"context"
 	"encoding/json"
 	"math"
 	"sort"
 	"testing"
 	"time"
 
-	"github.com/go-redis/redis/v7"
 	"github.com/google/go-cmp/cmp"
 	"github.com/google/go-cmp/cmp/cmpopts"
 	"github.com/google/uuid"
 	"github.com/hibiken/asynq/internal/base"
+	"github.com/hibiken/asynq/internal/timeutil"
+	"github.com/redis/go-redis/v9"
 )
 
 // EquateInt64Approx returns a Comparer option that treats int64 values
@@ -31,7 +33,7 @@ func EquateInt64Approx(margin int64) cmp.Option {
 var SortMsgOpt = cmp.Transformer("SortTaskMessages", func(in []*base.TaskMessage) []*base.TaskMessage {
 	out := append([]*base.TaskMessage(nil), in...) // Copy input to avoid mutating it
 	sort.Slice(out, func(i, j int) bool {
-		return out[i].ID.String() < out[j].ID.String()
+		return out[i].ID < out[j].ID
 	})
 	return out
 })
@@ -40,7 +42,7 @@ var SortMsgOpt = cmp.Transformer("SortTaskMessages", func(in []*base.TaskMessage
 var SortZSetEntryOpt = cmp.Transformer("SortZSetEntries", func(in []base.Z) []base.Z {
 	out := append([]base.Z(nil), in...) // Copy input to avoid mutating it
 	sort.Slice(out, func(i, j int) bool {
-		return out[i].Message.ID.String() < out[j].Message.ID.String()
+		return out[i].Message.ID < out[j].Message.ID
 	})
 	return out
 })
@@ -91,6 +93,20 @@ var SortStringSliceOpt = cmp.Transformer("SortStringSlice", func(in []string) []
 	return out
 })
 
+var SortRedisZSetEntryOpt = cmp.Transformer("SortZSetEntries", func(in []redis.Z) []redis.Z {
+	out := append([]redis.Z(nil), in...) // Copy input to avoid mutating it
+	sort.Slice(out, func(i, j int) bool {
+		// TODO: If member is a comparable type (int, string, etc) compare by the member
+		// Use generic comparable type here once update to go1.18
+		if _, ok := out[i].Member.(string); ok {
+			// If member is a string, compare the member
+			return out[i].Member.(string) < out[j].Member.(string)
+		}
+		return out[i].Score < out[j].Score
+	})
+	return out
+})
+
 // IgnoreIDOpt is an cmp.Option to ignore ID field in task messages when comparing.
 var IgnoreIDOpt = cmpopts.IgnoreFields(base.TaskMessage{}, "ID")
 
@@ -103,7 +119,7 @@ func NewTaskMessage(taskType string, payload []byte) *base.TaskMessage {
 // task type, payload and queue name.
 func NewTaskMessageWithQueue(taskType string, payload []byte, qname string) *base.TaskMessage {
 	return &base.TaskMessage{
-		ID:       uuid.New(),
+		ID:       uuid.NewString(),
 		Type:     taskType,
 		Queue:    qname,
 		Retry:    25,
@@ -113,6 +129,13 @@ func NewTaskMessageWithQueue(taskType string, payload []byte, qname string) *bas
 	}
 }
 
+// NewLeaseWithClock returns a new lease with the given expiration time and clock.
+func NewLeaseWithClock(expirationTime time.Time, clock timeutil.Clock) *base.Lease {
+	l := base.NewLease(expirationTime)
+	l.Clock = clock
+	return l
+}
+
 // JSON serializes the given key-value pairs into stream of bytes in JSON.
 func JSON(kv map[string]interface{}) []byte {
 	b, err := json.Marshal(kv)
@@ -138,6 +161,12 @@ func TaskMessageWithError(t base.TaskMessage, errMsg string, failedAt time.Time)
 	return &t
 }
 
+// TaskMessageWithCompletedAt returns an updated copy of t after completion.
+func TaskMessageWithCompletedAt(t base.TaskMessage, completedAt time.Time) *base.TaskMessage {
+	t.CompletedAt = completedAt.Unix()
+	return &t
+}
+
 // MustMarshal marshals given task message and returns a json string.
 // Calling test will fail if marshaling errors out.
 func MustMarshal(tb testing.TB, msg *base.TaskMessage) string {
@@ -165,12 +194,12 @@ func FlushDB(tb testing.TB, r redis.UniversalClient) {
 	tb.Helper()
 	switch r := r.(type) {
 	case *redis.Client:
-		if err := r.FlushDB().Err(); err != nil {
+		if err := r.FlushDB(context.Background()).Err(); err != nil {
 			tb.Fatal(err)
 		}
 	case *redis.ClusterClient:
-		err := r.ForEachMaster(func(c *redis.Client) error {
-			if err := c.FlushAll().Err(); err != nil {
+		err := r.ForEachMaster(context.Background(), func(ctx context.Context, c *redis.Client) error {
+			if err := c.FlushAll(ctx).Err(); err != nil {
 				return err
 			}
 			return nil
@@ -184,43 +213,65 @@ func FlushDB(tb testing.TB, r redis.UniversalClient) {
 // SeedPendingQueue initializes the specified queue with the given messages.
 func SeedPendingQueue(tb testing.TB, r redis.UniversalClient, msgs []*base.TaskMessage, qname string) {
 	tb.Helper()
-	r.SAdd(base.AllQueues, qname)
+	r.SAdd(context.Background(), base.AllQueues, qname)
 	seedRedisList(tb, r, base.PendingKey(qname), msgs, base.TaskStatePending)
 }
 
 // SeedActiveQueue initializes the active queue with the given messages.
 func SeedActiveQueue(tb testing.TB, r redis.UniversalClient, msgs []*base.TaskMessage, qname string) {
 	tb.Helper()
-	r.SAdd(base.AllQueues, qname)
+	r.SAdd(context.Background(), base.AllQueues, qname)
 	seedRedisList(tb, r, base.ActiveKey(qname), msgs, base.TaskStateActive)
 }
 
 // SeedScheduledQueue initializes the scheduled queue with the given messages.
 func SeedScheduledQueue(tb testing.TB, r redis.UniversalClient, entries []base.Z, qname string) {
 	tb.Helper()
-	r.SAdd(base.AllQueues, qname)
+	r.SAdd(context.Background(), base.AllQueues, qname)
 	seedRedisZSet(tb, r, base.ScheduledKey(qname), entries, base.TaskStateScheduled)
 }
 
 // SeedRetryQueue initializes the retry queue with the given messages.
 func SeedRetryQueue(tb testing.TB, r redis.UniversalClient, entries []base.Z, qname string) {
 	tb.Helper()
-	r.SAdd(base.AllQueues, qname)
+	r.SAdd(context.Background(), base.AllQueues, qname)
 	seedRedisZSet(tb, r, base.RetryKey(qname), entries, base.TaskStateRetry)
 }
 
 // SeedArchivedQueue initializes the archived queue with the given messages.
 func SeedArchivedQueue(tb testing.TB, r redis.UniversalClient, entries []base.Z, qname string) {
 	tb.Helper()
-	r.SAdd(base.AllQueues, qname)
+	r.SAdd(context.Background(), base.AllQueues, qname)
 	seedRedisZSet(tb, r, base.ArchivedKey(qname), entries, base.TaskStateArchived)
 }
 
-// SeedDeadlines initializes the deadlines set with the given entries.
-func SeedDeadlines(tb testing.TB, r redis.UniversalClient, entries []base.Z, qname string) {
+// SeedLease initializes the lease set with the given entries.
+func SeedLease(tb testing.TB, r redis.UniversalClient, entries []base.Z, qname string) {
 	tb.Helper()
-	r.SAdd(base.AllQueues, qname)
-	seedRedisZSet(tb, r, base.DeadlinesKey(qname), entries, base.TaskStateActive)
+	r.SAdd(context.Background(), base.AllQueues, qname)
+	seedRedisZSet(tb, r, base.LeaseKey(qname), entries, base.TaskStateActive)
+}
+
+// SeedCompletedQueue initializes the completed set with the given entries.
+func SeedCompletedQueue(tb testing.TB, r redis.UniversalClient, entries []base.Z, qname string) {
+	tb.Helper()
+	r.SAdd(context.Background(), base.AllQueues, qname)
+	seedRedisZSet(tb, r, base.CompletedKey(qname), entries, base.TaskStateCompleted)
+}
+
+// SeedGroup initializes the group with the given entries.
+func SeedGroup(tb testing.TB, r redis.UniversalClient, entries []base.Z, qname, gname string) {
+	tb.Helper()
+	ctx := context.Background()
+	r.SAdd(ctx, base.AllQueues, qname)
+	r.SAdd(ctx, base.AllGroups(qname), gname)
+	seedRedisZSet(tb, r, base.GroupKey(qname, gname), entries, base.TaskStateAggregating)
+}
+
+func SeedAggregationSet(tb testing.TB, r redis.UniversalClient, entries []base.Z, qname, gname, setID string) {
+	tb.Helper()
+	r.SAdd(context.Background(), base.AllQueues, qname)
+	seedRedisZSet(tb, r, base.AggregationSetKey(qname, gname, setID), entries, base.TaskStateAggregating)
 }
 
 // SeedAllPendingQueues initializes all of the specified queues with the given messages.
@@ -265,11 +316,31 @@ func SeedAllArchivedQueues(tb testing.TB, r redis.UniversalClient, archived map[
 	}
 }
 
-// SeedAllDeadlines initializes all of the deadlines with the given entries.
-func SeedAllDeadlines(tb testing.TB, r redis.UniversalClient, deadlines map[string][]base.Z) {
+// SeedAllLease initializes all of the lease sets with the given entries.
+func SeedAllLease(tb testing.TB, r redis.UniversalClient, lease map[string][]base.Z) {
 	tb.Helper()
-	for q, entries := range deadlines {
-		SeedDeadlines(tb, r, entries, q)
+	for q, entries := range lease {
+		SeedLease(tb, r, entries, q)
+	}
+}
+
+// SeedAllCompletedQueues initializes all of the completed queues with the given entries.
+func SeedAllCompletedQueues(tb testing.TB, r redis.UniversalClient, completed map[string][]base.Z) {
+	tb.Helper()
+	for q, entries := range completed {
+		SeedCompletedQueue(tb, r, entries, q)
+	}
+}
+
+// SeedAllGroups initializes all groups in all queues.
+// The map maps queue names to group names which maps to a list of task messages and the time it was
+// added to the group.
+func SeedAllGroups(tb testing.TB, r redis.UniversalClient, groups map[string]map[string][]base.Z) {
+	tb.Helper()
+	for qname, g := range groups {
+		for gname, entries := range g {
+			SeedGroup(tb, r, entries, qname, gname)
+		}
 	}
 }
 
@@ -278,22 +349,21 @@ func seedRedisList(tb testing.TB, c redis.UniversalClient, key string,
 	tb.Helper()
 	for _, msg := range msgs {
 		encoded := MustMarshal(tb, msg)
-		if err := c.LPush(key, msg.ID.String()).Err(); err != nil {
+		if err := c.LPush(context.Background(), key, msg.ID).Err(); err != nil {
 			tb.Fatal(err)
 		}
-		key := base.TaskKey(msg.Queue, msg.ID.String())
+		taskKey := base.TaskKey(msg.Queue, msg.ID)
 		data := map[string]interface{}{
 			"msg":        encoded,
 			"state":      state.String(),
-			"timeout":    msg.Timeout,
-			"deadline":   msg.Deadline,
 			"unique_key": msg.UniqueKey,
+			"group":      msg.GroupKey,
 		}
-		if err := c.HSet(key, data).Err(); err != nil {
+		if err := c.HSet(context.Background(), taskKey, data).Err(); err != nil {
 			tb.Fatal(err)
 		}
 		if len(msg.UniqueKey) > 0 {
-			err := c.SetNX(msg.UniqueKey, msg.ID.String(), 1*time.Minute).Err()
+			err := c.SetNX(context.Background(), msg.UniqueKey, msg.ID, 1*time.Minute).Err()
 			if err != nil {
 				tb.Fatalf("Failed to set unique lock in redis: %v", err)
 			}
@@ -307,23 +377,22 @@ func seedRedisZSet(tb testing.TB, c redis.UniversalClient, key string,
 	for _, item := range items {
 		msg := item.Message
 		encoded := MustMarshal(tb, msg)
-		z := &redis.Z{Member: msg.ID.String(), Score: float64(item.Score)}
-		if err := c.ZAdd(key, z).Err(); err != nil {
+		z := redis.Z{Member: msg.ID, Score: float64(item.Score)}
+		if err := c.ZAdd(context.Background(), key, z).Err(); err != nil {
 			tb.Fatal(err)
 		}
-		key := base.TaskKey(msg.Queue, msg.ID.String())
+		taskKey := base.TaskKey(msg.Queue, msg.ID)
 		data := map[string]interface{}{
 			"msg":        encoded,
 			"state":      state.String(),
-			"timeout":    msg.Timeout,
-			"deadline":   msg.Deadline,
 			"unique_key": msg.UniqueKey,
+			"group":      msg.GroupKey,
 		}
-		if err := c.HSet(key, data).Err(); err != nil {
+		if err := c.HSet(context.Background(), taskKey, data).Err(); err != nil {
 			tb.Fatal(err)
 		}
 		if len(msg.UniqueKey) > 0 {
-			err := c.SetNX(msg.UniqueKey, msg.ID.String(), 1*time.Minute).Err()
+			err := c.SetNX(context.Background(), msg.UniqueKey, msg.ID, 1*time.Minute).Err()
 			if err != nil {
 				tb.Fatalf("Failed to set unique lock in redis: %v", err)
 			}
@@ -366,6 +435,13 @@ func GetArchivedMessages(tb testing.TB, r redis.UniversalClient, qname string) [
 	return getMessagesFromZSet(tb, r, qname, base.ArchivedKey, base.TaskStateArchived)
 }
 
+// GetCompletedMessages returns all completed task messages in the given queue.
+// It also asserts the state field of the task.
+func GetCompletedMessages(tb testing.TB, r redis.UniversalClient, qname string) []*base.TaskMessage {
+	tb.Helper()
+	return getMessagesFromZSet(tb, r, qname, base.CompletedKey, base.TaskStateCompleted)
+}
+
 // GetScheduledEntries returns all scheduled messages and its score in the given queue.
 // It also asserts the state field of the task.
 func GetScheduledEntries(tb testing.TB, r redis.UniversalClient, qname string) []base.Z {
@@ -387,24 +463,39 @@ func GetArchivedEntries(tb testing.TB, r redis.UniversalClient, qname string) []
 	return getMessagesFromZSetWithScores(tb, r, qname, base.ArchivedKey, base.TaskStateArchived)
 }
 
-// GetDeadlinesEntries returns all task messages and its score in the deadlines set for the given queue.
+// GetLeaseEntries returns all task IDs and its score in the lease set for the given queue.
 // It also asserts the state field of the task.
-func GetDeadlinesEntries(tb testing.TB, r redis.UniversalClient, qname string) []base.Z {
+func GetLeaseEntries(tb testing.TB, r redis.UniversalClient, qname string) []base.Z {
 	tb.Helper()
-	return getMessagesFromZSetWithScores(tb, r, qname, base.DeadlinesKey, base.TaskStateActive)
+	return getMessagesFromZSetWithScores(tb, r, qname, base.LeaseKey, base.TaskStateActive)
+}
+
+// GetCompletedEntries returns all completed messages and its score in the given queue.
+// It also asserts the state field of the task.
+func GetCompletedEntries(tb testing.TB, r redis.UniversalClient, qname string) []base.Z {
+	tb.Helper()
+	return getMessagesFromZSetWithScores(tb, r, qname, base.CompletedKey, base.TaskStateCompleted)
+}
+
+// GetGroupEntries returns all scheduled messages and its score in the given queue.
+// It also asserts the state field of the task.
+func GetGroupEntries(tb testing.TB, r redis.UniversalClient, qname, groupKey string) []base.Z {
+	tb.Helper()
+	return getMessagesFromZSetWithScores(tb, r, qname,
+		func(qname string) string { return base.GroupKey(qname, groupKey) }, base.TaskStateAggregating)
 }
 
 // Retrieves all messages stored under `keyFn(qname)` key in redis list.
 func getMessagesFromList(tb testing.TB, r redis.UniversalClient, qname string,
 	keyFn func(qname string) string, state base.TaskState) []*base.TaskMessage {
 	tb.Helper()
-	ids := r.LRange(keyFn(qname), 0, -1).Val()
+	ids := r.LRange(context.Background(), keyFn(qname), 0, -1).Val()
 	var msgs []*base.TaskMessage
 	for _, id := range ids {
 		taskKey := base.TaskKey(qname, id)
-		data := r.HGet(taskKey, "msg").Val()
+		data := r.HGet(context.Background(), taskKey, "msg").Val()
 		msgs = append(msgs, MustUnmarshal(tb, data))
-		if gotState := r.HGet(taskKey, "state").Val(); gotState != state.String() {
+		if gotState := r.HGet(context.Background(), taskKey, "state").Val(); gotState != state.String() {
 			tb.Errorf("task (id=%q) is in %q state, want %v", id, gotState, state)
 		}
 	}
@@ -415,13 +506,13 @@ func getMessagesFromList(tb testing.TB, r redis.UniversalClient, qname string,
 func getMessagesFromZSet(tb testing.TB, r redis.UniversalClient, qname string,
 	keyFn func(qname string) string, state base.TaskState) []*base.TaskMessage {
 	tb.Helper()
-	ids := r.ZRange(keyFn(qname), 0, -1).Val()
+	ids := r.ZRange(context.Background(), keyFn(qname), 0, -1).Val()
 	var msgs []*base.TaskMessage
 	for _, id := range ids {
 		taskKey := base.TaskKey(qname, id)
-		msg := r.HGet(taskKey, "msg").Val()
+		msg := r.HGet(context.Background(), taskKey, "msg").Val()
 		msgs = append(msgs, MustUnmarshal(tb, msg))
-		if gotState := r.HGet(taskKey, "state").Val(); gotState != state.String() {
+		if gotState := r.HGet(context.Background(), taskKey, "state").Val(); gotState != state.String() {
 			tb.Errorf("task (id=%q) is in %q state, want %v", id, gotState, state)
 		}
 	}
@@ -432,16 +523,120 @@ func getMessagesFromZSet(tb testing.TB, r redis.UniversalClient, qname string,
 func getMessagesFromZSetWithScores(tb testing.TB, r redis.UniversalClient,
 	qname string, keyFn func(qname string) string, state base.TaskState) []base.Z {
 	tb.Helper()
-	zs := r.ZRangeWithScores(keyFn(qname), 0, -1).Val()
+	zs := r.ZRangeWithScores(context.Background(), keyFn(qname), 0, -1).Val()
 	var res []base.Z
 	for _, z := range zs {
 		taskID := z.Member.(string)
 		taskKey := base.TaskKey(qname, taskID)
-		msg := r.HGet(taskKey, "msg").Val()
+		msg := r.HGet(context.Background(), taskKey, "msg").Val()
 		res = append(res, base.Z{Message: MustUnmarshal(tb, msg), Score: int64(z.Score)})
-		if gotState := r.HGet(taskKey, "state").Val(); gotState != state.String() {
+		if gotState := r.HGet(context.Background(), taskKey, "state").Val(); gotState != state.String() {
 			tb.Errorf("task (id=%q) is in %q state, want %v", taskID, gotState, state)
 		}
 	}
 	return res
 }
+
+// TaskSeedData holds the data required to seed tasks under the task key in test.
+type TaskSeedData struct {
+	Msg          *base.TaskMessage
+	State        base.TaskState
+	PendingSince time.Time
+}
+
+func SeedTasks(tb testing.TB, r redis.UniversalClient, taskData []*TaskSeedData) {
+	for _, data := range taskData {
+		msg := data.Msg
+		ctx := context.Background()
+		key := base.TaskKey(msg.Queue, msg.ID)
+		v := map[string]interface{}{
+			"msg":        MustMarshal(tb, msg),
+			"state":      data.State.String(),
+			"unique_key": msg.UniqueKey,
+			"group":      msg.GroupKey,
+		}
+		if !data.PendingSince.IsZero() {
+			v["pending_since"] = data.PendingSince.Unix()
+		}
+		if err := r.HSet(ctx, key, v).Err(); err != nil {
+			tb.Fatalf("Failed to write task data in redis: %v", err)
+		}
+		if len(msg.UniqueKey) > 0 {
+			err := r.SetNX(ctx, msg.UniqueKey, msg.ID, 1*time.Minute).Err()
+			if err != nil {
+				tb.Fatalf("Failed to set unique lock in redis: %v", err)
+			}
+		}
+	}
+}
+
+func SeedRedisZSets(tb testing.TB, r redis.UniversalClient, zsets map[string][]redis.Z) {
+	for key, zs := range zsets {
+		// FIXME: How come we can't simply do ZAdd(ctx, key, zs...) here?
+		for _, z := range zs {
+			if err := r.ZAdd(context.Background(), key, z).Err(); err != nil {
+				tb.Fatalf("Failed to seed zset (key=%q): %v", key, err)
+			}
+		}
+	}
+}
+
+func SeedRedisSets(tb testing.TB, r redis.UniversalClient, sets map[string][]string) {
+	for key, set := range sets {
+		SeedRedisSet(tb, r, key, set)
+	}
+}
+
+func SeedRedisSet(tb testing.TB, r redis.UniversalClient, key string, members []string) {
+	for _, mem := range members {
+		if err := r.SAdd(context.Background(), key, mem).Err(); err != nil {
+			tb.Fatalf("Failed to seed set (key=%q): %v", key, err)
+		}
+	}
+}
+
+func SeedRedisLists(tb testing.TB, r redis.UniversalClient, lists map[string][]string) {
+	for key, vals := range lists {
+		for _, v := range vals {
+			if err := r.LPush(context.Background(), key, v).Err(); err != nil {
+				tb.Fatalf("Failed to seed list (key=%q): %v", key, err)
+			}
+		}
+	}
+}
+
+func AssertRedisLists(t *testing.T, r redis.UniversalClient, wantLists map[string][]string) {
+	for key, want := range wantLists {
+		got, err := r.LRange(context.Background(), key, 0, -1).Result()
+		if err != nil {
+			t.Fatalf("Failed to read list (key=%q): %v", key, err)
+		}
+		if diff := cmp.Diff(want, got, SortStringSliceOpt); diff != "" {
+			t.Errorf("mismatch found in list (key=%q): (-want,+got)\n%s", key, diff)
+		}
+	}
+}
+
+func AssertRedisSets(t *testing.T, r redis.UniversalClient, wantSets map[string][]string) {
+	for key, want := range wantSets {
+		got, err := r.SMembers(context.Background(), key).Result()
+		if err != nil {
+			t.Fatalf("Failed to read set (key=%q): %v", key, err)
+		}
+		if diff := cmp.Diff(want, got, SortStringSliceOpt); diff != "" {
+			t.Errorf("mismatch found in set (key=%q): (-want,+got)\n%s", key, diff)
+		}
+	}
+}
+
+func AssertRedisZSets(t *testing.T, r redis.UniversalClient, wantZSets map[string][]redis.Z) {
+	for key, want := range wantZSets {
+		got, err := r.ZRangeWithScores(context.Background(), key, 0, -1).Result()
+		if err != nil {
+			t.Fatalf("Failed to read zset (key=%q): %v", key, err)
+		}
+		if diff := cmp.Diff(want, got, SortRedisZSetEntryOpt); diff != "" {
+			t.Errorf("mismatch found in zset (key=%q): (-want,+got)\n%s", key, diff)
+		}
+	}
+}

internal/timeutil/timeutil.go

@@ -0,0 +1,59 @@
+// Copyright 2022 Kentaro Hibino. All rights reserved.
+// Use of this source code is governed by a MIT license
+// that can be found in the LICENSE file.
+
+// Package timeutil exports functions and types related to time and date.
+package timeutil
+
+import (
+	"sync"
+	"time"
+)
+
+// A Clock is an object that can tell you the current time.
+//
+// This interface allows decoupling code that uses time from the code that creates
+// a point in time. You can use this to your advantage by injecting Clocks into interfaces
+// rather than having implementations call time.Now() directly.
+//
+// Use RealClock() in production.
+// Use SimulatedClock() in test.
+type Clock interface {
+	Now() time.Time
+}
+
+func NewRealClock() Clock { return &realTimeClock{} }
+
+type realTimeClock struct{}
+
+func (_ *realTimeClock) Now() time.Time { return time.Now() }
+
+// A SimulatedClock is a concrete Clock implementation that doesn't "tick" on its own.
+// Time is advanced by explicit call to the AdvanceTime() or SetTime() functions.
+// This object is concurrency safe.
+type SimulatedClock struct {
+	mu sync.Mutex
+	t  time.Time // guarded by mu
+}
+
+func NewSimulatedClock(t time.Time) *SimulatedClock {
+	return &SimulatedClock{t: t}
+}
+
+func (c *SimulatedClock) Now() time.Time {
+	c.mu.Lock()
+	defer c.mu.Unlock()
+	return c.t
+}
+
+func (c *SimulatedClock) SetTime(t time.Time) {
+	c.mu.Lock()
+	defer c.mu.Unlock()
+	c.t = t
+}
+
+func (c *SimulatedClock) AdvanceTime(d time.Duration) {
+	c.mu.Lock()
+	defer c.mu.Unlock()
+	c.t = c.t.Add(d)
+}

internal/timeutil/timeutil_test.go

@@ -0,0 +1,48 @@
+// Copyright 2022 Kentaro Hibino. All rights reserved.
+// Use of this source code is governed by a MIT license
+// that can be found in the LICENSE file.
+
+package timeutil
+
+import (
+	"testing"
+	"time"
+)
+
+func TestSimulatedClock(t *testing.T) {
+	now := time.Now()
+
+	tests := []struct {
+		desc      string
+		initTime  time.Time
+		advanceBy time.Duration
+		wantTime  time.Time
+	}{
+		{
+			desc:      "advance time forward",
+			initTime:  now,
+			advanceBy: 30 * time.Second,
+			wantTime:  now.Add(30 * time.Second),
+		},
+		{
+			desc:      "advance time backward",
+			initTime:  now,
+			advanceBy: -10 * time.Second,
+			wantTime:  now.Add(-10 * time.Second),
+		},
+	}
+
+	for _, tc := range tests {
+		c := NewSimulatedClock(tc.initTime)
+
+		if c.Now() != tc.initTime {
+			t.Errorf("%s: Before Advance; SimulatedClock.Now() = %v, want %v", tc.desc, c.Now(), tc.initTime)
+		}
+
+		c.AdvanceTime(tc.advanceBy)
+
+		if c.Now() != tc.wantTime {
+			t.Errorf("%s: After Advance; SimulatedClock.Now() = %v, want %v", tc.desc, c.Now(), tc.wantTime)
+		}
+	}
+}

janitor.go

@@ -0,0 +1,86 @@
+// Copyright 2021 Kentaro Hibino. All rights reserved.
+// Use of this source code is governed by a MIT license
+// that can be found in the LICENSE file.
+
+package asynq
+
+import (
+	"sync"
+	"time"
+
+	"github.com/hibiken/asynq/internal/base"
+	"github.com/hibiken/asynq/internal/log"
+)
+
+// A janitor is responsible for deleting expired completed tasks from the specified
+// queues. It periodically checks for any expired tasks in the completed set, and
+// deletes them.
+type janitor struct {
+	logger *log.Logger
+	broker base.Broker
+
+	// channel to communicate back to the long running "janitor" goroutine.
+	done chan struct{}
+
+	// list of queue names to check.
+	queues []string
+
+	// average interval between checks.
+	avgInterval time.Duration
+
+	// number of tasks to be deleted when janitor runs to delete the expired completed tasks.
+	batchSize int
+}
+
+type janitorParams struct {
+	logger    *log.Logger
+	broker    base.Broker
+	queues    []string
+	interval  time.Duration
+	batchSize int
+}
+
+func newJanitor(params janitorParams) *janitor {
+	return &janitor{
+		logger:      params.logger,
+		broker:      params.broker,
+		done:        make(chan struct{}),
+		queues:      params.queues,
+		avgInterval: params.interval,
+		batchSize:   params.batchSize,
+	}
+}
+
+func (j *janitor) shutdown() {
+	j.logger.Debug("Janitor shutting down...")
+	// Signal the janitor goroutine to stop.
+	j.done <- struct{}{}
+}
+
+// start starts the "janitor" goroutine.
+func (j *janitor) start(wg *sync.WaitGroup) {
+	wg.Add(1)
+	timer := time.NewTimer(j.avgInterval) // randomize this interval with margin of 1s
+	go func() {
+		defer wg.Done()
+		for {
+			select {
+			case <-j.done:
+				j.logger.Debug("Janitor done")
+				return
+			case <-timer.C:
+				j.exec()
+				timer.Reset(j.avgInterval)
+			}
+		}
+	}()
+}
+
+func (j *janitor) exec() {
+	for _, qname := range j.queues {
+		if err := j.broker.DeleteExpiredCompletedTasks(qname, j.batchSize); err != nil {
+			j.logger.Errorf("Failed to delete expired completed tasks from queue %q: %v",
+				qname, err)
+		}
+	}
+}

janitor_test.go

@@ -0,0 +1,91 @@
+// Copyright 2021 Kentaro Hibino. All rights reserved.
+// Use of this source code is governed by a MIT license
+// that can be found in the LICENSE file.
+
+package asynq
+
+import (
+	"sync"
+	"testing"
+	"time"
+
+	"github.com/google/go-cmp/cmp"
+	"github.com/hibiken/asynq/internal/base"
+	"github.com/hibiken/asynq/internal/rdb"
+	h "github.com/hibiken/asynq/internal/testutil"
+)
+
+func newCompletedTask(qname, tasktype string, payload []byte, completedAt time.Time) *base.TaskMessage {
+	msg := h.NewTaskMessageWithQueue(tasktype, payload, qname)
+	msg.CompletedAt = completedAt.Unix()
+	return msg
+}
+
+func TestJanitor(t *testing.T) {
+	r := setup(t)
+	defer r.Close()
+	rdbClient := rdb.NewRDB(r)
+	const interval = 1 * time.Second
+	const batchSize = 100
+	janitor := newJanitor(janitorParams{
+		logger:    testLogger,
+		broker:    rdbClient,
+		queues:    []string{"default", "custom"},
+		interval:  interval,
+		batchSize: batchSize,
+	})
+
+	now := time.Now()
+	hourAgo := now.Add(-1 * time.Hour)
+	minuteAgo := now.Add(-1 * time.Minute)
+	halfHourAgo := now.Add(-30 * time.Minute)
+	halfHourFromNow := now.Add(30 * time.Minute)
+	fiveMinFromNow := now.Add(5 * time.Minute)
+	msg1 := newCompletedTask("default", "task1", nil, hourAgo)
+	msg2 := newCompletedTask("default", "task2", nil, minuteAgo)
+	msg3 := newCompletedTask("custom", "task3", nil, hourAgo)
+	msg4 := newCompletedTask("custom", "task4", nil, minuteAgo)
+
+	tests := []struct {
+		completed     map[string][]base.Z // initial completed sets
+		wantCompleted map[string][]base.Z // expected completed sets after janitor runs
+	}{
+		{
+			completed: map[string][]base.Z{
+				"default": {
+					{Message: msg1, Score: halfHourAgo.Unix()},
+					{Message: msg2, Score: fiveMinFromNow.Unix()},
+				},
+				"custom": {
+					{Message: msg3, Score: halfHourFromNow.Unix()},
+					{Message: msg4, Score: minuteAgo.Unix()},
+				},
+			},
+			wantCompleted: map[string][]base.Z{
+				"default": {
+					{Message: msg2, Score: fiveMinFromNow.Unix()},
+				},
+				"custom": {
+					{Message: msg3, Score: halfHourFromNow.Unix()},
+				},
+			},
+		},
+	}
+
+	for _, tc := range tests {
+		h.FlushDB(t, r)
+		h.SeedAllCompletedQueues(t, r, tc.completed)
+
+		var wg sync.WaitGroup
+		janitor.start(&wg)
+		time.Sleep(2 * interval) // make sure to let janitor run at least one time
+		janitor.shutdown()
+
+		for qname, want := range tc.wantCompleted {
+			got := h.GetCompletedEntries(t, r, qname)
+			if diff := cmp.Diff(want, got, h.SortZSetEntryOpt); diff != "" {
+				t.Errorf("diff found in %q after running janitor: (-want, +got)\n%s", base.CompletedKey(qname), diff)
+			}
+		}
+	}
+}

periodic_task_manager.go

@@ -0,0 +1,253 @@
+// Copyright 2022 Kentaro Hibino. All rights reserved.
+// Use of this source code is governed by a MIT license
+// that can be found in the LICENSE file.
+
+package asynq
+
+import (
+	"crypto/sha256"
+	"fmt"
+	"sort"
+	"sync"
+	"time"
+
+	"github.com/redis/go-redis/v9"
+)
+
+// PeriodicTaskManager manages scheduling of periodic tasks.
+// It syncs scheduler's entries by calling the config provider periodically.
+type PeriodicTaskManager struct {
+	s            *Scheduler
+	p            PeriodicTaskConfigProvider
+	syncInterval time.Duration
+	done         chan (struct{})
+	wg           sync.WaitGroup
+	m            map[string]string // map[hash]entryID
+}
+
+type PeriodicTaskManagerOpts struct {
+	// Required: must be non nil
+	PeriodicTaskConfigProvider PeriodicTaskConfigProvider
+
+	// Optional: if RedisUniversalClient is nil must be non nil
+	RedisConnOpt RedisConnOpt
+
+	// Optional: if RedisUniversalClient is non nil, RedisConnOpt is ignored.
+	RedisUniversalClient redis.UniversalClient
+
+	// Optional: scheduler options
+	*SchedulerOpts
+
+	// Optional: default is 3m
+	SyncInterval time.Duration
+}
+
+const defaultSyncInterval = 3 * time.Minute
+
+// NewPeriodicTaskManager returns a new PeriodicTaskManager instance.
+// The given opts should specify the RedisConnOp and PeriodicTaskConfigProvider at minimum.
+func NewPeriodicTaskManager(opts PeriodicTaskManagerOpts) (*PeriodicTaskManager, error) {
+	if opts.PeriodicTaskConfigProvider == nil {
+		return nil, fmt.Errorf("PeriodicTaskConfigProvider cannot be nil")
+	}
+	if opts.RedisConnOpt == nil && opts.RedisUniversalClient == nil {
+		return nil, fmt.Errorf("RedisConnOpt/RedisUniversalClient cannot be nil")
+	}
+	var scheduler *Scheduler
+	if opts.RedisUniversalClient != nil {
+		scheduler = NewSchedulerFromRedisClient(opts.RedisUniversalClient, opts.SchedulerOpts)
+	} else {
+		scheduler = NewScheduler(opts.RedisConnOpt, opts.SchedulerOpts)
+	}
+
+	syncInterval := opts.SyncInterval
+	if syncInterval == 0 {
+		syncInterval = defaultSyncInterval
+	}
+	return &PeriodicTaskManager{
+		s:            scheduler,
+		p:            opts.PeriodicTaskConfigProvider,
+		syncInterval: syncInterval,
+		done:         make(chan struct{}),
+		m:            make(map[string]string),
+	}, nil
+}
+
+// PeriodicTaskConfigProvider provides configs for periodic tasks.
+// GetConfigs will be called by a PeriodicTaskManager periodically to
+// sync the scheduler's entries with the configs returned by the provider.
+type PeriodicTaskConfigProvider interface {
+	GetConfigs() ([]*PeriodicTaskConfig, error)
+}
+
+// PeriodicTaskConfig specifies the details of a periodic task.
+type PeriodicTaskConfig struct {
+	Cronspec string   // required: must be non empty string
+	Task     *Task    // required: must be non nil
+	Opts     []Option // optional: can be nil
+}
+
+func (c *PeriodicTaskConfig) hash() string {
+	h := sha256.New()
+	_, _ = h.Write([]byte(c.Cronspec))
+	_, _ = h.Write([]byte(c.Task.Type()))
+	h.Write(c.Task.Payload())
+	opts := stringifyOptions(c.Opts)
+	sort.Strings(opts)
+	for _, opt := range opts {
+		_, _ = h.Write([]byte(opt))
+	}
+	return fmt.Sprintf("%x", h.Sum(nil))
+}
+
+func validatePeriodicTaskConfig(c *PeriodicTaskConfig) error {
+	if c == nil {
+		return fmt.Errorf("PeriodicTaskConfig cannot be nil")
+	}
+	if c.Task == nil {
+		return fmt.Errorf("PeriodicTaskConfig.Task cannot be nil")
+	}
+	if c.Cronspec == "" {
+		return fmt.Errorf("PeriodicTaskConfig.Cronspec cannot be empty")
+	}
+	return nil
+}
+
+// Start starts a scheduler and background goroutine to sync the scheduler with the configs
+// returned by the provider.
+//
+// Start returns any error encountered at start up time.
+func (mgr *PeriodicTaskManager) Start() error {
+	if mgr.s == nil || mgr.p == nil {
+		panic("asynq: cannot start uninitialized PeriodicTaskManager; use NewPeriodicTaskManager to initialize")
+	}
+	if err := mgr.initialSync(); err != nil {
+		return fmt.Errorf("asynq: %v", err)
+	}
+	if err := mgr.s.Start(); err != nil {
+		return fmt.Errorf("asynq: %v", err)
+	}
+	mgr.wg.Add(1)
+	go func() {
+		defer mgr.wg.Done()
+		ticker := time.NewTicker(mgr.syncInterval)
+		for {
+			select {
+			case <-mgr.done:
+				mgr.s.logger.Debugf("Stopping syncer goroutine")
+				ticker.Stop()
+				return
+			case <-ticker.C:
+				mgr.sync()
+			}
+		}
+	}()
+	return nil
+}
+
+// Shutdown gracefully shuts down the manager.
+// It notifies a background syncer goroutine to stop and stops scheduler.
+func (mgr *PeriodicTaskManager) Shutdown() {
+	close(mgr.done)
+	mgr.wg.Wait()
+	mgr.s.Shutdown()
+}
+
+// Run starts the manager and blocks until an os signal to exit the program is received.
+// Once it receives a signal, it gracefully shuts down the manager.
+func (mgr *PeriodicTaskManager) Run() error {
+	if err := mgr.Start(); err != nil {
+		return err
+	}
+	mgr.s.waitForSignals()
+	mgr.Shutdown()
+	mgr.s.logger.Debugf("PeriodicTaskManager exiting")
+	return nil
+}
+
+func (mgr *PeriodicTaskManager) initialSync() error {
+	configs, err := mgr.p.GetConfigs()
+	if err != nil {
+		return fmt.Errorf("initial call to GetConfigs failed: %v", err)
+	}
+	for _, c := range configs {
+		if err := validatePeriodicTaskConfig(c); err != nil {
+			return fmt.Errorf("initial call to GetConfigs contained an invalid config: %v", err)
+		}
+	}
+	mgr.add(configs)
+	return nil
+}
+
+func (mgr *PeriodicTaskManager) add(configs []*PeriodicTaskConfig) {
+	for _, c := range configs {
+		entryID, err := mgr.s.Register(c.Cronspec, c.Task, c.Opts...)
+		if err != nil {
+			mgr.s.logger.Errorf("Failed to register periodic task: cronspec=%q task=%q err=%v",
+				c.Cronspec, c.Task.Type(), err)
+			continue
+		}
+		mgr.m[c.hash()] = entryID
+		mgr.s.logger.Infof("Successfully registered periodic task: cronspec=%q task=%q, entryID=%s",
+			c.Cronspec, c.Task.Type(), entryID)
+	}
+}
+
+func (mgr *PeriodicTaskManager) remove(removed map[string]string) {
+	for hash, entryID := range removed {
+		if err := mgr.s.Unregister(entryID); err != nil {
+			mgr.s.logger.Errorf("Failed to unregister periodic task: %v", err)
+			continue
+		}
+		delete(mgr.m, hash)
+		mgr.s.logger.Infof("Successfully unregistered periodic task: entryID=%s", entryID)
+	}
+}
+
+func (mgr *PeriodicTaskManager) sync() {
+	configs, err := mgr.p.GetConfigs()
+	if err != nil {
+		mgr.s.logger.Errorf("Failed to get periodic task configs: %v", err)
+		return
+	}
+	for _, c := range configs {
+		if err := validatePeriodicTaskConfig(c); err != nil {
+			mgr.s.logger.Errorf("Failed to sync: GetConfigs returned an invalid config: %v", err)
+			return
+		}
+	}
+	// Diff and only register/unregister the newly added/removed entries.
+	removed := mgr.diffRemoved(configs)
+	added := mgr.diffAdded(configs)
+	mgr.remove(removed)
+	mgr.add(added)
+}
+
+// diffRemoved diffs the incoming configs with the registered config and returns
+// a map containing hash and entryID of each config that was removed.
+func (mgr *PeriodicTaskManager) diffRemoved(configs []*PeriodicTaskConfig) map[string]string {
+	newConfigs := make(map[string]string)
+	for _, c := range configs {
+		newConfigs[c.hash()] = "" // empty value since we don't have entryID yet
+	}
+	removed := make(map[string]string)
+	for k, v := range mgr.m {
+		// test whether existing config is present in the incoming configs
+		if _, found := newConfigs[k]; !found {
+			removed[k] = v
+		}
+	}
+	return removed
+}
+
+// diffAdded diffs the incoming configs with the registered configs and returns
+// a list of configs that were added.
+func (mgr *PeriodicTaskManager) diffAdded(configs []*PeriodicTaskConfig) []*PeriodicTaskConfig {
+	var added []*PeriodicTaskConfig
+	for _, c := range configs {
+		if _, found := mgr.m[c.hash()]; !found {
+			added = append(added, c)
+		}
+	}
+	return added
+}

periodic_task_manager_test.go

@@ -0,0 +1,340 @@
+// Copyright 2022 Kentaro Hibino. All rights reserved.
+// Use of this source code is governed by a MIT license
+// that can be found in the LICENSE file.
+
+package asynq
+
+import (
+	"sort"
+	"sync"
+	"testing"
+	"time"
+
+	"github.com/google/go-cmp/cmp"
+)
+
+// Trivial implementation of PeriodicTaskConfigProvider for testing purpose.
+type FakeConfigProvider struct {
+	mu   sync.Mutex
+	cfgs []*PeriodicTaskConfig
+}
+
+func (p *FakeConfigProvider) SetConfigs(cfgs []*PeriodicTaskConfig) {
+	p.mu.Lock()
+	defer p.mu.Unlock()
+	p.cfgs = cfgs
+}
+
+func (p *FakeConfigProvider) GetConfigs() ([]*PeriodicTaskConfig, error) {
+	p.mu.Lock()
+	defer p.mu.Unlock()
+	return p.cfgs, nil
+}
+
+func TestNewPeriodicTaskManager(t *testing.T) {
+	redisConnOpt := getRedisConnOpt(t)
+	cfgs := []*PeriodicTaskConfig{
+		{Cronspec: "* * * * *", Task: NewTask("foo", nil)},
+		{Cronspec: "* * * * *", Task: NewTask("bar", nil)},
+	}
+	tests := []struct {
+		desc string
+		opts PeriodicTaskManagerOpts
+	}{
+		{
+			desc: "with provider and redisConnOpt",
+			opts: PeriodicTaskManagerOpts{
+				RedisConnOpt:               redisConnOpt,
+				PeriodicTaskConfigProvider: &FakeConfigProvider{cfgs: cfgs},
+			},
+		},
+		{
+			desc: "with sync option",
+			opts: PeriodicTaskManagerOpts{
+				RedisConnOpt:               redisConnOpt,
+				PeriodicTaskConfigProvider: &FakeConfigProvider{cfgs: cfgs},
+				SyncInterval:               5 * time.Minute,
+			},
+		},
+		{
+			desc: "with scheduler option",
+			opts: PeriodicTaskManagerOpts{
+				RedisConnOpt:               redisConnOpt,
+				PeriodicTaskConfigProvider: &FakeConfigProvider{cfgs: cfgs},
+				SyncInterval:               5 * time.Minute,
+				SchedulerOpts: &SchedulerOpts{
+					LogLevel: DebugLevel,
+				},
+			},
+		},
+	}
+
+	for _, tc := range tests {
+		_, err := NewPeriodicTaskManager(tc.opts)
+		if err != nil {
+			t.Errorf("%s; NewPeriodicTaskManager returned error: %v", tc.desc, err)
+		}
+	}
+
+	t.Run("error", func(t *testing.T) {
+		tests := []struct {
+			desc string
+			opts PeriodicTaskManagerOpts
+		}{
+			{
+				desc: "without provider",
+				opts: PeriodicTaskManagerOpts{
+					RedisConnOpt: redisConnOpt,
+				},
+			},
+			{
+				desc: "without redisConOpt",
+				opts: PeriodicTaskManagerOpts{
+					PeriodicTaskConfigProvider: &FakeConfigProvider{cfgs: cfgs},
+				},
+			},
+		}
+
+		for _, tc := range tests {
+			_, err := NewPeriodicTaskManager(tc.opts)
+			if err == nil {
+				t.Errorf("%s; NewPeriodicTaskManager did not return error", tc.desc)
+			}
+		}
+	})
+}
+
+func TestPeriodicTaskConfigHash(t *testing.T) {
+	tests := []struct {
+		desc   string
+		a      *PeriodicTaskConfig
+		b      *PeriodicTaskConfig
+		isSame bool
+	}{
+		{
+			desc: "basic identity test",
+			a: &PeriodicTaskConfig{
+				Cronspec: "* * * * *",
+				Task:     NewTask("foo", nil),
+			},
+			b: &PeriodicTaskConfig{
+				Cronspec: "* * * * *",
+				Task:     NewTask("foo", nil),
+			},
+			isSame: true,
+		},
+		{
+			desc: "with a option",
+			a: &PeriodicTaskConfig{
+				Cronspec: "* * * * *",
+				Task:     NewTask("foo", nil),
+				Opts:     []Option{Queue("myqueue")},
+			},
+			b: &PeriodicTaskConfig{
+				Cronspec: "* * * * *",
+				Task:     NewTask("foo", nil),
+				Opts:     []Option{Queue("myqueue")},
+			},
+			isSame: true,
+		},
+		{
+			desc: "with multiple options (different order)",
+			a: &PeriodicTaskConfig{
+				Cronspec: "* * * * *",
+				Task:     NewTask("foo", nil),
+				Opts:     []Option{Unique(5 * time.Minute), Queue("myqueue")},
+			},
+			b: &PeriodicTaskConfig{
+				Cronspec: "* * * * *",
+				Task:     NewTask("foo", nil),
+				Opts:     []Option{Queue("myqueue"), Unique(5 * time.Minute)},
+			},
+			isSame: true,
+		},
+		{
+			desc: "with payload",
+			a: &PeriodicTaskConfig{
+				Cronspec: "* * * * *",
+				Task:     NewTask("foo", []byte("hello world!")),
+				Opts:     []Option{Queue("myqueue")},
+			},
+			b: &PeriodicTaskConfig{
+				Cronspec: "* * * * *",
+				Task:     NewTask("foo", []byte("hello world!")),
+				Opts:     []Option{Queue("myqueue")},
+			},
+			isSame: true,
+		},
+		{
+			desc: "with different cronspecs",
+			a: &PeriodicTaskConfig{
+				Cronspec: "* * * * *",
+				Task:     NewTask("foo", nil),
+			},
+			b: &PeriodicTaskConfig{
+				Cronspec: "5 * * * *",
+				Task:     NewTask("foo", nil),
+			},
+			isSame: false,
+		},
+		{
+			desc: "with different task type",
+			a: &PeriodicTaskConfig{
+				Cronspec: "* * * * *",
+				Task:     NewTask("foo", nil),
+			},
+			b: &PeriodicTaskConfig{
+				Cronspec: "* * * * *",
+				Task:     NewTask("bar", nil),
+			},
+			isSame: false,
+		},
+		{
+			desc: "with different options",
+			a: &PeriodicTaskConfig{
+				Cronspec: "* * * * *",
+				Task:     NewTask("foo", nil),
+				Opts:     []Option{Queue("myqueue")},
+			},
+			b: &PeriodicTaskConfig{
+				Cronspec: "* * * * *",
+				Task:     NewTask("foo", nil),
+				Opts:     []Option{Unique(10 * time.Minute)},
+			},
+			isSame: false,
+		},
+		{
+			desc: "with different options (one is subset of the other)",
+			a: &PeriodicTaskConfig{
+				Cronspec: "* * * * *",
+				Task:     NewTask("foo", nil),
+				Opts:     []Option{Queue("myqueue")},
+			},
+			b: &PeriodicTaskConfig{
+				Cronspec: "* * * * *",
+				Task:     NewTask("foo", nil),
+				Opts:     []Option{Queue("myqueue"), Unique(10 * time.Minute)},
+			},
+			isSame: false,
+		},
+		{
+			desc: "with different payload",
+			a: &PeriodicTaskConfig{
+				Cronspec: "* * * * *",
+				Task:     NewTask("foo", []byte("hello!")),
+				Opts:     []Option{Queue("myqueue")},
+			},
+			b: &PeriodicTaskConfig{
+				Cronspec: "* * * * *",
+				Task:     NewTask("foo", []byte("HELLO!")),
+				Opts:     []Option{Queue("myqueue"), Unique(10 * time.Minute)},
+			},
+			isSame: false,
+		},
+	}
+
+	for _, tc := range tests {
+		if tc.isSame && tc.a.hash() != tc.b.hash() {
+			t.Errorf("%s: a.hash=%s b.hash=%s expected to be equal",
+				tc.desc, tc.a.hash(), tc.b.hash())
+		}
+		if !tc.isSame && tc.a.hash() == tc.b.hash() {
+			t.Errorf("%s: a.hash=%s b.hash=%s expected to be not equal",
+				tc.desc, tc.a.hash(), tc.b.hash())
+		}
+	}
+}
+
+// Things to test.
+// - Run the manager
+// - Change provider to return new configs
+// - Verify that the scheduler synced with the new config
+func TestPeriodicTaskManager(t *testing.T) {
+	// Note: In this test, we'll use task type as an ID for each config.
+	cfgs := []*PeriodicTaskConfig{
+		{Task: NewTask("task1", nil), Cronspec: "* * * * 1"},
+		{Task: NewTask("task2", nil), Cronspec: "* * * * 2"},
+	}
+	const syncInterval = 3 * time.Second
+	provider := &FakeConfigProvider{cfgs: cfgs}
+	mgr, err := NewPeriodicTaskManager(PeriodicTaskManagerOpts{
+		RedisConnOpt:               getRedisConnOpt(t),
+		PeriodicTaskConfigProvider: provider,
+		SyncInterval:               syncInterval,
+	})
+	if err != nil {
+		t.Fatalf("Failed to initialize PeriodicTaskManager: %v", err)
+	}
+
+	if err := mgr.Start(); err != nil {
+		t.Fatalf("Failed to start PeriodicTaskManager: %v", err)
+	}
+	defer mgr.Shutdown()
+
+	got := extractCronEntries(mgr.s)
+	want := []*cronEntry{
+		{Cronspec: "* * * * 1", TaskType: "task1"},
+		{Cronspec: "* * * * 2", TaskType: "task2"},
+	}
+	if diff := cmp.Diff(want, got, sortCronEntry); diff != "" {
+		t.Errorf("Diff found in scheduler's registered entries: %s", diff)
+	}
+
+	// Change the underlying configs
+	// - task2 removed
+	// - task3 added
+	provider.SetConfigs([]*PeriodicTaskConfig{
+		{Task: NewTask("task1", nil), Cronspec: "* * * * 1"},
+		{Task: NewTask("task3", nil), Cronspec: "* * * * 3"},
+	})
+
+	// Wait for the next sync
+	time.Sleep(syncInterval * 2)
+
+	// Verify the entries are synced
+	got = extractCronEntries(mgr.s)
+	want = []*cronEntry{
+		{Cronspec: "* * * * 1", TaskType: "task1"},
+		{Cronspec: "* * * * 3", TaskType: "task3"},
+	}
+	if diff := cmp.Diff(want, got, sortCronEntry); diff != "" {
+		t.Errorf("Diff found in scheduler's registered entries: %s", diff)
+	}
+
+	// Change the underlying configs
+	// All configs removed, empty set.
+	provider.SetConfigs([]*PeriodicTaskConfig{})
+
+	// Wait for the next sync
+	time.Sleep(syncInterval * 2)
+
+	// Verify the entries are synced
+	got = extractCronEntries(mgr.s)
+	want = []*cronEntry{}
+	if diff := cmp.Diff(want, got, sortCronEntry); diff != "" {
+		t.Errorf("Diff found in scheduler's registered entries: %s", diff)
+	}
+}
+
+func extractCronEntries(s *Scheduler) []*cronEntry {
+	var out []*cronEntry
+	for _, e := range s.cron.Entries() {
+		job := e.Job.(*enqueueJob)
+		out = append(out, &cronEntry{Cronspec: job.cronspec, TaskType: job.task.Type()})
+	}
+	return out
+}
+
+var sortCronEntry = cmp.Transformer("sortCronEntry", func(in []*cronEntry) []*cronEntry {
+	out := append([]*cronEntry(nil), in...)
+	sort.Slice(out, func(i, j int) bool {
+		return out[i].TaskType < out[j].TaskType
+	})
+	return out
+})
+
+// A simple struct to allow for simpler comparison in test.
+type cronEntry struct {
+	Cronspec string
+	TaskType string
+}

processor.go

@@ -7,7 +7,8 @@ package asynq
 import (
 	"context"
 	"fmt"
-	"math/rand"
+	"math"
+	"math/rand/v2"
 	"runtime"
 	"runtime/debug"
 	"sort"
@@ -16,26 +17,31 @@ import (
 	"time"
 
 	"github.com/hibiken/asynq/internal/base"
+	asynqcontext "github.com/hibiken/asynq/internal/context"
 	"github.com/hibiken/asynq/internal/errors"
 	"github.com/hibiken/asynq/internal/log"
+	"github.com/hibiken/asynq/internal/timeutil"
 	"golang.org/x/time/rate"
 )
 
 type processor struct {
 	logger *log.Logger
 	broker base.Broker
+	clock  timeutil.Clock
 
-	handler Handler
+	handler   Handler
+	baseCtxFn func() context.Context
 
 	queueConfig map[string]int
 
 	// orderedQueues is set only in strict-priority mode.
 	orderedQueues []string
 
-	retryDelayFunc RetryDelayFunc
-
-	errHandler ErrorHandler
+	taskCheckInterval time.Duration
+	retryDelayFunc    RetryDelayFunc
+	isFailureFunc     func(error) bool
 
+	errHandler      ErrorHandler
 	shutdownTimeout time.Duration
 
 	// channel via which to send sync requests to syncer.
@@ -67,18 +73,21 @@ type processor struct {
 }
 
 type processorParams struct {
-	logger          *log.Logger
-	broker          base.Broker
-	retryDelayFunc  RetryDelayFunc
-	syncCh          chan<- *syncRequest
-	cancelations    *base.Cancelations
-	concurrency     int
-	queues          map[string]int
-	strictPriority  bool
-	errHandler      ErrorHandler
-	shutdownTimeout time.Duration
-	starting        chan<- *workerInfo
-	finished        chan<- *base.TaskMessage
+	logger            *log.Logger
+	broker            base.Broker
+	baseCtxFn         func() context.Context
+	retryDelayFunc    RetryDelayFunc
+	taskCheckInterval time.Duration
+	isFailureFunc     func(error) bool
+	syncCh            chan<- *syncRequest
+	cancelations      *base.Cancelations
+	concurrency       int
+	queues            map[string]int
+	strictPriority    bool
+	errHandler        ErrorHandler
+	shutdownTimeout   time.Duration
+	starting          chan<- *workerInfo
+	finished          chan<- *base.TaskMessage
 }
 
 // newProcessor constructs a new processor.
@@ -89,23 +98,27 @@ func newProcessor(params processorParams) *processor {
 		orderedQueues = sortByPriority(queues)
 	}
 	return &processor{
-		logger:          params.logger,
-		broker:          params.broker,
-		queueConfig:     queues,
-		orderedQueues:   orderedQueues,
-		retryDelayFunc:  params.retryDelayFunc,
-		syncRequestCh:   params.syncCh,
-		cancelations:    params.cancelations,
-		errLogLimiter:   rate.NewLimiter(rate.Every(3*time.Second), 1),
-		sema:            make(chan struct{}, params.concurrency),
-		done:            make(chan struct{}),
-		quit:            make(chan struct{}),
-		abort:           make(chan struct{}),
-		errHandler:      params.errHandler,
-		handler:         HandlerFunc(func(ctx context.Context, t *Task) error { return fmt.Errorf("handler not set") }),
-		shutdownTimeout: params.shutdownTimeout,
-		starting:        params.starting,
-		finished:        params.finished,
+		logger:            params.logger,
+		broker:            params.broker,
+		baseCtxFn:         params.baseCtxFn,
+		clock:             timeutil.NewRealClock(),
+		queueConfig:       queues,
+		orderedQueues:     orderedQueues,
+		taskCheckInterval: params.taskCheckInterval,
+		retryDelayFunc:    params.retryDelayFunc,
+		isFailureFunc:     params.isFailureFunc,
+		syncRequestCh:     params.syncCh,
+		cancelations:      params.cancelations,
+		errLogLimiter:     rate.NewLimiter(rate.Every(3*time.Second), 1),
+		sema:              make(chan struct{}, params.concurrency),
+		done:              make(chan struct{}),
+		quit:              make(chan struct{}),
+		abort:             make(chan struct{}),
+		errHandler:        params.errHandler,
+		handler:           HandlerFunc(func(ctx context.Context, t *Task) error { return fmt.Errorf("handler not set") }),
+		shutdownTimeout:   params.shutdownTimeout,
+		starting:          params.starting,
+		finished:          params.finished,
 	}
 }
 
@@ -160,7 +173,7 @@ func (p *processor) exec() {
 		return
 	case p.sema <- struct{}{}: // acquire token
 		qnames := p.queues()
-		msg, deadline, err := p.broker.Dequeue(qnames...)
+		msg, leaseExpirationTime, err := p.broker.Dequeue(qnames...)
 		switch {
 		case errors.Is(err, errors.ErrNoProcessableTask):
 			p.logger.Debug("All queues are empty")
@@ -168,7 +181,8 @@ func (p *processor) exec() {
 			// Sleep to avoid slamming redis and let scheduler move tasks into queues.
 			// Note: We are not using blocking pop operation and polling queues instead.
 			// This adds significant load to redis.
-			time.Sleep(time.Second)
+			jitter := rand.N(p.taskCheckInterval)
+			time.Sleep(p.taskCheckInterval/2 + jitter)
 			<-p.sema // release token
 			return
 		case err != nil:
@@ -179,60 +193,78 @@ func (p *processor) exec() {
 			return
 		}
 
-		p.starting <- &workerInfo{msg, time.Now(), deadline}
+		lease := base.NewLease(leaseExpirationTime)
+		deadline := p.computeDeadline(msg)
+		p.starting <- &workerInfo{msg, time.Now(), deadline, lease}
 		go func() {
 			defer func() {
 				p.finished <- msg
 				<-p.sema // release token
 			}()
 
-			ctx, cancel := createContext(msg, deadline)
-			p.cancelations.Add(msg.ID.String(), cancel)
+			ctx, cancel := asynqcontext.New(p.baseCtxFn(), msg, deadline)
+			p.cancelations.Add(msg.ID, cancel)
 			defer func() {
 				cancel()
-				p.cancelations.Delete(msg.ID.String())
+				p.cancelations.Delete(msg.ID)
 			}()
 
 			// check context before starting a worker goroutine.
 			select {
 			case <-ctx.Done():
 				// already canceled (e.g. deadline exceeded).
-				p.retryOrKill(ctx, msg, ctx.Err())
+				p.handleFailedMessage(ctx, lease, msg, ctx.Err())
 				return
 			default:
 			}
 
 			resCh := make(chan error, 1)
 			go func() {
-				resCh <- p.perform(ctx, NewTask(msg.Type, msg.Payload))
+				task := newTask(
+					msg.Type,
+					msg.Payload,
+					&ResultWriter{
+						id:     msg.ID,
+						qname:  msg.Queue,
+						broker: p.broker,
+						ctx:    ctx,
+					},
+				)
+				resCh <- p.perform(ctx, task)
 			}()
 
 			select {
 			case <-p.abort:
 				// time is up, push the message back to queue and quit this worker goroutine.
 				p.logger.Warnf("Quitting worker. task id=%s", msg.ID)
-				p.requeue(msg)
+				p.requeue(lease, msg)
+				return
+			case <-lease.Done():
+				cancel()
+				p.handleFailedMessage(ctx, lease, msg, ErrLeaseExpired)
 				return
 			case <-ctx.Done():
-				p.retryOrKill(ctx, msg, ctx.Err())
+				p.handleFailedMessage(ctx, lease, msg, ctx.Err())
 				return
 			case resErr := <-resCh:
-				// Note: One of three things should happen.
-				// 1) Done     -> Removes the message from Active
-				// 2) Retry    -> Removes the message from Active & Adds the message to Retry
-				// 3) Archive  -> Removes the message from Active & Adds the message to archive
 				if resErr != nil {
-					p.retryOrKill(ctx, msg, resErr)
+					p.handleFailedMessage(ctx, lease, msg, resErr)
 					return
 				}
-				p.markAsDone(ctx, msg)
+				p.handleSucceededMessage(lease, msg)
 			}
 		}()
 	}
 }
 
-func (p *processor) requeue(msg *base.TaskMessage) {
-	err := p.broker.Requeue(msg)
+func (p *processor) requeue(l *base.Lease, msg *base.TaskMessage) {
+	if !l.IsValid() {
+		// If lease is not valid, do not write to redis; Let recoverer take care of it.
+		return
+	}
+	ctx, cancel := context.WithDeadline(context.Background(), l.Deadline())
+	defer cancel()
+	err := p.broker.Requeue(ctx, msg)
 	if err != nil {
 		p.logger.Errorf("Could not push task id=%s back to queue: %v", msg.ID, err)
 	} else {
@@ -240,21 +272,53 @@ func (p *processor) requeue(msg *base.TaskMessage) {
 	}
 }
 
-func (p *processor) markAsDone(ctx context.Context, msg *base.TaskMessage) {
-	err := p.broker.Done(msg)
+func (p *processor) handleSucceededMessage(l *base.Lease, msg *base.TaskMessage) {
+	if msg.Retention > 0 {
+		p.markAsComplete(l, msg)
+	} else {
+		p.markAsDone(l, msg)
+	}
+}
+
+func (p *processor) markAsComplete(l *base.Lease, msg *base.TaskMessage) {
+	if !l.IsValid() {
+		// If lease is not valid, do not write to redis; Let recoverer take care of it.
+		return
+	}
+	ctx, cancel := context.WithDeadline(context.Background(), l.Deadline())
+	defer cancel()
+	err := p.broker.MarkAsComplete(ctx, msg)
 	if err != nil {
-		errMsg := fmt.Sprintf("Could not remove task id=%s type=%q from %q err: %+v", msg.ID, msg.Type, base.ActiveKey(msg.Queue), err)
-		deadline, ok := ctx.Deadline()
-		if !ok {
-			panic("asynq: internal error: missing deadline in context")
-		}
+		errMsg := fmt.Sprintf("Could not move task id=%s type=%q from %q to %q:  %+v",
+			msg.ID, msg.Type, base.ActiveKey(msg.Queue), base.CompletedKey(msg.Queue), err)
 		p.logger.Warnf("%s; Will retry syncing", errMsg)
 		p.syncRequestCh <- &syncRequest{
 			fn: func() error {
-				return p.broker.Done(msg)
+				return p.broker.MarkAsComplete(ctx, msg)
 			},
 			errMsg:   errMsg,
-			deadline: deadline,
+			deadline: l.Deadline(),
+		}
+	}
+}
+
+func (p *processor) markAsDone(l *base.Lease, msg *base.TaskMessage) {
+	if !l.IsValid() {
+		// If lease is not valid, do not write to redis; Let recoverer take care of it.
+		return
+	}
+	ctx, cancel := context.WithDeadline(context.Background(), l.Deadline())
+	defer cancel()
+	err := p.broker.Done(ctx, msg)
+	if err != nil {
+		errMsg := fmt.Sprintf("Could not remove task id=%s type=%q from %q err: %+v", msg.ID, msg.Type, base.ActiveKey(msg.Queue), err)
+		p.logger.Warnf("%s; Will retry syncing", errMsg)
+		p.syncRequestCh <- &syncRequest{
+			fn: func() error {
+				return p.broker.Done(ctx, msg)
+			},
+			errMsg:   errMsg,
+			deadline: l.Deadline(),
 		}
 	}
 }
@@ -263,54 +327,66 @@ func (p *processor) markAsDone(ctx context.Context, msg *base.TaskMessage) {
 // the task should not be retried and should be archived instead.
 var SkipRetry = errors.New("skip retry for the task")
 
-func (p *processor) retryOrKill(ctx context.Context, msg *base.TaskMessage, err error) {
+// RevokeTask is used as a return value from Handler.ProcessTask to indicate that
+// the task should not be retried or archived.
+var RevokeTask = errors.New("revoke task")
+
+func (p *processor) handleFailedMessage(ctx context.Context, l *base.Lease, msg *base.TaskMessage, err error) {
 	if p.errHandler != nil {
 		p.errHandler.HandleError(ctx, NewTask(msg.Type, msg.Payload), err)
 	}
-	if msg.Retried >= msg.Retry || errors.Is(err, SkipRetry) {
+	switch {
+	case errors.Is(err, RevokeTask):
+		p.logger.Warnf("revoke task id=%s", msg.ID)
+		p.markAsDone(l, msg)
+	case msg.Retried >= msg.Retry || errors.Is(err, SkipRetry):
 		p.logger.Warnf("Retry exhausted for task id=%s", msg.ID)
-		p.archive(ctx, msg, err)
-	} else {
-		p.retry(ctx, msg, err)
+		p.archive(l, msg, err)
+	default:
+		p.retry(l, msg, err, p.isFailureFunc(err))
 	}
 }
 
-func (p *processor) retry(ctx context.Context, msg *base.TaskMessage, e error) {
+func (p *processor) retry(l *base.Lease, msg *base.TaskMessage, e error, isFailure bool) {
+	if !l.IsValid() {
+		// If lease is not valid, do not write to redis; Let recoverer take care of it.
+		return
+	}
+	ctx, cancel := context.WithDeadline(context.Background(), l.Deadline())
+	defer cancel()
 	d := p.retryDelayFunc(msg.Retried, e, NewTask(msg.Type, msg.Payload))
 	retryAt := time.Now().Add(d)
-	err := p.broker.Retry(msg, retryAt, e.Error())
+	err := p.broker.Retry(ctx, msg, retryAt, e.Error(), isFailure)
 	if err != nil {
 		errMsg := fmt.Sprintf("Could not move task id=%s from %q to %q", msg.ID, base.ActiveKey(msg.Queue), base.RetryKey(msg.Queue))
-		deadline, ok := ctx.Deadline()
-		if !ok {
-			panic("asynq: internal error: missing deadline in context")
-		}
 		p.logger.Warnf("%s; Will retry syncing", errMsg)
 		p.syncRequestCh <- &syncRequest{
 			fn: func() error {
-				return p.broker.Retry(msg, retryAt, e.Error())
+				return p.broker.Retry(ctx, msg, retryAt, e.Error(), isFailure)
 			},
 			errMsg:   errMsg,
-			deadline: deadline,
+			deadline: l.Deadline(),
 		}
 	}
 }
 
-func (p *processor) archive(ctx context.Context, msg *base.TaskMessage, e error) {
-	err := p.broker.Archive(msg, e.Error())
+func (p *processor) archive(l *base.Lease, msg *base.TaskMessage, e error) {
+	if !l.IsValid() {
+		// If lease is not valid, do not write to redis; Let recoverer take care of it.
+		return
+	}
+	ctx, cancel := context.WithDeadline(context.Background(), l.Deadline())
+	defer cancel()
+	err := p.broker.Archive(ctx, msg, e.Error())
 	if err != nil {
 		errMsg := fmt.Sprintf("Could not move task id=%s from %q to %q", msg.ID, base.ActiveKey(msg.Queue), base.ArchivedKey(msg.Queue))
-		deadline, ok := ctx.Deadline()
-		if !ok {
-			panic("asynq: internal error: missing deadline in context")
-		}
 		p.logger.Warnf("%s; Will retry syncing", errMsg)
 		p.syncRequestCh <- &syncRequest{
 			fn: func() error {
-				return p.broker.Archive(msg, e.Error())
+				return p.broker.Archive(ctx, msg, e.Error())
 			},
 			errMsg:   errMsg,
-			deadline: deadline,
+			deadline: l.Deadline(),
 		}
 	}
 }
@@ -337,8 +413,7 @@ func (p *processor) queues() []string {
 			names = append(names, qname)
 		}
 	}
-	r := rand.New(rand.NewSource(time.Now().UnixNano()))
-	r.Shuffle(len(names), func(i, j int) { names[i], names[j] = names[j], names[i] })
+	rand.Shuffle(len(names), func(i, j int) { names[i], names[j] = names[j], names[i] })
 	return uniq(names, len(p.queueConfig))
 }
 
@@ -355,12 +430,15 @@ func (p *processor) perform(ctx context.Context, task *Task) (err error) {
 				// map/slice usage. The parent frame should have the real trigger.
 				_, file, line, ok = runtime.Caller(2)
 			}
-
+			var errMsg string
 			// Include the file and line number info in the error, if runtime.Caller returned ok.
 			if ok {
-				err = fmt.Errorf("panic [%s:%d]: %v", file, line, x)
+				errMsg = fmt.Sprintf("panic [%s:%d]: %v", file, line, x)
 			} else {
-				err = fmt.Errorf("panic: %v", x)
+				errMsg = fmt.Sprintf("panic: %v", x)
+			}
+			err = &errors.PanicError{
+				ErrMsg: errMsg,
 			}
 		}
 	}()
@@ -440,3 +518,23 @@ func gcd(xs ...int) int {
 	}
 	return res
 }
+
+// computeDeadline returns the given task's deadline,
+func (p *processor) computeDeadline(msg *base.TaskMessage) time.Time {
+	if msg.Timeout == 0 && msg.Deadline == 0 {
+		p.logger.Errorf("asynq: internal error: both timeout and deadline are not set for the task message: %s", msg.ID)
+		return p.clock.Now().Add(defaultTimeout)
+	}
+	if msg.Timeout != 0 && msg.Deadline != 0 {
+		deadlineUnix := math.Min(float64(p.clock.Now().Unix()+msg.Timeout), float64(msg.Deadline))
+		return time.Unix(int64(deadlineUnix), 0)
+	}
+	if msg.Timeout != 0 {
+		return p.clock.Now().Add(time.Duration(msg.Timeout) * time.Second)
+	}
+	return time.Unix(msg.Deadline, 0)
+}
+
+func IsPanicError(err error) bool {
+	return errors.IsPanicError(err)
+}

processor_test.go

@@ -9,16 +9,27 @@ import (
 	"encoding/json"
 	"fmt"
 	"sort"
+	"strings"
 	"sync"
 	"testing"
 	"time"
 
 	"github.com/google/go-cmp/cmp"
-	h "github.com/hibiken/asynq/internal/asynqtest"
+	"github.com/google/go-cmp/cmp/cmpopts"
 	"github.com/hibiken/asynq/internal/base"
+	"github.com/hibiken/asynq/internal/errors"
+	"github.com/hibiken/asynq/internal/log"
 	"github.com/hibiken/asynq/internal/rdb"
+	h "github.com/hibiken/asynq/internal/testutil"
+	"github.com/hibiken/asynq/internal/timeutil"
 )
 
+var taskCmpOpts = []cmp.Option{
+	sortTaskOpt,                               // sort the tasks
+	cmp.AllowUnexported(Task{}),               // allow typename, payload fields to be compared
+	cmpopts.IgnoreFields(Task{}, "opts", "w"), // ignore opts, w fields
+}
+
 // fakeHeartbeater receives from starting and finished channels and do nothing.
 func fakeHeartbeater(starting <-chan *workerInfo, finished <-chan *base.TaskMessage, done <-chan struct{}) {
 	for {
@@ -42,6 +53,36 @@ func fakeSyncer(syncCh <-chan *syncRequest, done <-chan struct{}) {
 	}
 }
 
+// Returns a processor instance configured for testing purpose.
+func newProcessorForTest(t *testing.T, r *rdb.RDB, h Handler) *processor {
+	starting := make(chan *workerInfo)
+	finished := make(chan *base.TaskMessage)
+	syncCh := make(chan *syncRequest)
+	done := make(chan struct{})
+	t.Cleanup(func() { close(done) })
+	go fakeHeartbeater(starting, finished, done)
+	go fakeSyncer(syncCh, done)
+	p := newProcessor(processorParams{
+		logger:            testLogger,
+		broker:            r,
+		baseCtxFn:         context.Background,
+		retryDelayFunc:    DefaultRetryDelayFunc,
+		taskCheckInterval: defaultTaskCheckInterval,
+		isFailureFunc:     defaultIsFailureFunc,
+		syncCh:            syncCh,
+		cancelations:      base.NewCancelations(),
+		concurrency:       10,
+		queues:            defaultQueueConfig,
+		strictPriority:    false,
+		errHandler:        nil,
+		shutdownTimeout:   defaultShutdownTimeout,
+		starting:          starting,
+		finished:          finished,
+	})
+	p.handler = h
+	return p
+}
+
 func TestProcessorSuccessWithSingleQueue(t *testing.T) {
 	r := setup(t)
 	defer r.Close()
@@ -87,45 +128,24 @@ func TestProcessorSuccessWithSingleQueue(t *testing.T) {
 			processed = append(processed, task)
 			return nil
 		}
-		starting := make(chan *workerInfo)
-		finished := make(chan *base.TaskMessage)
-		syncCh := make(chan *syncRequest)
-		done := make(chan struct{})
-		defer func() { close(done) }()
-		go fakeHeartbeater(starting, finished, done)
-		go fakeSyncer(syncCh, done)
-		p := newProcessor(processorParams{
-			logger:          testLogger,
-			broker:          rdbClient,
-			retryDelayFunc:  DefaultRetryDelayFunc,
-			syncCh:          syncCh,
-			cancelations:    base.NewCancelations(),
-			concurrency:     10,
-			queues:          defaultQueueConfig,
-			strictPriority:  false,
-			errHandler:      nil,
-			shutdownTimeout: defaultShutdownTimeout,
-			starting:        starting,
-			finished:        finished,
-		})
-		p.handler = HandlerFunc(handler)
+		p := newProcessorForTest(t, rdbClient, HandlerFunc(handler))
 
 		p.start(&sync.WaitGroup{})
 		for _, msg := range tc.incoming {
-			err := rdbClient.Enqueue(msg)
+			err := rdbClient.Enqueue(context.Background(), msg)
 			if err != nil {
 				p.shutdown()
 				t.Fatal(err)
 			}
 		}
 		time.Sleep(2 * time.Second) // wait for two second to allow all pending tasks to be processed.
-		if l := r.LLen(base.ActiveKey(base.DefaultQueueName)).Val(); l != 0 {
+		if l := r.LLen(context.Background(), base.ActiveKey(base.DefaultQueueName)).Val(); l != 0 {
 			t.Errorf("%q has %d tasks, want 0", base.ActiveKey(base.DefaultQueueName), l)
 		}
 		p.shutdown()
 
 		mu.Lock()
-		if diff := cmp.Diff(tc.wantProcessed, processed, sortTaskOpt, cmp.AllowUnexported(Task{})); diff != "" {
+		if diff := cmp.Diff(tc.wantProcessed, processed, taskCmpOpts...); diff != "" {
 			t.Errorf("mismatch found in processed tasks; (-want, +got)\n%s", diff)
 		}
 		mu.Unlock()
@@ -179,46 +199,26 @@ func TestProcessorSuccessWithMultipleQueues(t *testing.T) {
 			processed = append(processed, task)
 			return nil
 		}
-		starting := make(chan *workerInfo)
-		finished := make(chan *base.TaskMessage)
-		syncCh := make(chan *syncRequest)
-		done := make(chan struct{})
-		defer func() { close(done) }()
-		go fakeHeartbeater(starting, finished, done)
-		go fakeSyncer(syncCh, done)
-		p := newProcessor(processorParams{
-			logger:         testLogger,
-			broker:         rdbClient,
-			retryDelayFunc: DefaultRetryDelayFunc,
-			syncCh:         syncCh,
-			cancelations:   base.NewCancelations(),
-			concurrency:    10,
-			queues: map[string]int{
-				"default": 2,
-				"high":    3,
-				"low":     1,
-			},
-			strictPriority:  false,
-			errHandler:      nil,
-			shutdownTimeout: defaultShutdownTimeout,
-			starting:        starting,
-			finished:        finished,
-		})
-		p.handler = HandlerFunc(handler)
+		p := newProcessorForTest(t, rdbClient, HandlerFunc(handler))
+		p.queueConfig = map[string]int{
+			"default": 2,
+			"high":    3,
+			"low":     1,
+		}
 
 		p.start(&sync.WaitGroup{})
 		// Wait for two second to allow all pending tasks to be processed.
 		time.Sleep(2 * time.Second)
 		// Make sure no messages are stuck in active list.
 		for _, qname := range tc.queues {
-			if l := r.LLen(base.ActiveKey(qname)).Val(); l != 0 {
+			if l := r.LLen(context.Background(), base.ActiveKey(qname)).Val(); l != 0 {
 				t.Errorf("%q has %d tasks, want 0", base.ActiveKey(qname), l)
 			}
 		}
 		p.shutdown()
 
 		mu.Lock()
-		if diff := cmp.Diff(tc.wantProcessed, processed, sortTaskOpt, cmp.AllowUnexported(Task{})); diff != "" {
+		if diff := cmp.Diff(tc.wantProcessed, processed, taskCmpOpts...); diff != "" {
 			t.Errorf("mismatch found in processed tasks; (-want, +got)\n%s", diff)
 		}
 		mu.Unlock()
@@ -265,38 +265,17 @@ func TestProcessTasksWithLargeNumberInPayload(t *testing.T) {
 			processed = append(processed, task)
 			return nil
 		}
-		starting := make(chan *workerInfo)
-		finished := make(chan *base.TaskMessage)
-		syncCh := make(chan *syncRequest)
-		done := make(chan struct{})
-		defer func() { close(done) }()
-		go fakeHeartbeater(starting, finished, done)
-		go fakeSyncer(syncCh, done)
-		p := newProcessor(processorParams{
-			logger:          testLogger,
-			broker:          rdbClient,
-			retryDelayFunc:  DefaultRetryDelayFunc,
-			syncCh:          syncCh,
-			cancelations:    base.NewCancelations(),
-			concurrency:     10,
-			queues:          defaultQueueConfig,
-			strictPriority:  false,
-			errHandler:      nil,
-			shutdownTimeout: defaultShutdownTimeout,
-			starting:        starting,
-			finished:        finished,
-		})
-		p.handler = HandlerFunc(handler)
+		p := newProcessorForTest(t, rdbClient, HandlerFunc(handler))
 
 		p.start(&sync.WaitGroup{})
 		time.Sleep(2 * time.Second) // wait for two second to allow all pending tasks to be processed.
-		if l := r.LLen(base.ActiveKey(base.DefaultQueueName)).Val(); l != 0 {
+		if l := r.LLen(context.Background(), base.ActiveKey(base.DefaultQueueName)).Val(); l != 0 {
 			t.Errorf("%q has %d tasks, want 0", base.ActiveKey(base.DefaultQueueName), l)
 		}
 		p.shutdown()
 
 		mu.Lock()
-		if diff := cmp.Diff(tc.wantProcessed, processed, sortTaskOpt, cmp.AllowUnexported(Task{})); diff != "" {
+		if diff := cmp.Diff(tc.wantProcessed, processed, taskCmpOpts...); diff != "" {
 			t.Errorf("mismatch found in processed tasks; (-want, +got)\n%s", diff)
 		}
 		mu.Unlock()
@@ -316,6 +295,7 @@ func TestProcessorRetry(t *testing.T) {
 
 	errMsg := "something went wrong"
 	wrappedSkipRetry := fmt.Errorf("%s:%w", errMsg, SkipRetry)
+	wrappedRevokeTask := fmt.Errorf("%s:%w", errMsg, RevokeTask)
 
 	tests := []struct {
 		desc         string              // test description
@@ -333,7 +313,7 @@ func TestProcessorRetry(t *testing.T) {
 			pending: []*base.TaskMessage{m1, m2, m3, m4},
 			delay:   time.Minute,
 			handler: HandlerFunc(func(ctx context.Context, task *Task) error {
-				return fmt.Errorf(errMsg)
+				return errors.New(errMsg)
 			}),
 			wait:         2 * time.Second,
 			wantErrMsg:   errMsg,
@@ -367,6 +347,32 @@ func TestProcessorRetry(t *testing.T) {
 			wantArchived: []*base.TaskMessage{m1, m2},
 			wantErrCount: 2, // ErrorHandler should still be called with SkipRetry error
 		},
+		{
+			desc:    "Should revoke task",
+			pending: []*base.TaskMessage{m1, m2},
+			delay:   time.Minute,
+			handler: HandlerFunc(func(ctx context.Context, task *Task) error {
+				return RevokeTask // return RevokeTask without wrapping
+			}),
+			wait:         2 * time.Second,
+			wantErrMsg:   RevokeTask.Error(),
+			wantRetry:    []*base.TaskMessage{},
+			wantArchived: []*base.TaskMessage{},
+			wantErrCount: 2, // ErrorHandler should still be called with RevokeTask error
+		},
+		{
+			desc:    "Should revoke task (with error wrapping)",
+			pending: []*base.TaskMessage{m1, m2},
+			delay:   time.Minute,
+			handler: HandlerFunc(func(ctx context.Context, task *Task) error {
+				return wrappedRevokeTask
+			}),
+			wait:         2 * time.Second,
+			wantErrMsg:   wrappedRevokeTask.Error(),
+			wantRetry:    []*base.TaskMessage{},
+			wantArchived: []*base.TaskMessage{},
+			wantErrCount: 2, // ErrorHandler should still be called with RevokeTask error
+		},
 	}
 
 	for _, tc := range tests {
@@ -386,26 +392,9 @@ func TestProcessorRetry(t *testing.T) {
 			defer mu.Unlock()
 			n++
 		}
-		starting := make(chan *workerInfo)
-		finished := make(chan *base.TaskMessage)
-		done := make(chan struct{})
-		defer func() { close(done) }()
-		go fakeHeartbeater(starting, finished, done)
-		p := newProcessor(processorParams{
-			logger:          testLogger,
-			broker:          rdbClient,
-			retryDelayFunc:  delayFunc,
-			syncCh:          nil,
-			cancelations:    base.NewCancelations(),
-			concurrency:     10,
-			queues:          defaultQueueConfig,
-			strictPriority:  false,
-			errHandler:      ErrorHandlerFunc(errHandler),
-			shutdownTimeout: defaultShutdownTimeout,
-			starting:        starting,
-			finished:        finished,
-		})
-		p.handler = tc.handler
+		p := newProcessorForTest(t, rdbClient, tc.handler)
+		p.errHandler = ErrorHandlerFunc(errHandler)
+		p.retryDelayFunc = delayFunc
 
 		p.start(&sync.WaitGroup{})
 		runTime := time.Now() // time when processor is running
@@ -439,7 +428,7 @@ func TestProcessorRetry(t *testing.T) {
 			t.Errorf("%s: mismatch found in %q after running processor; (-want, +got)\n%s", tc.desc, base.ArchivedKey(base.DefaultQueueName), diff)
 		}
 
-		if l := r.LLen(base.ActiveKey(base.DefaultQueueName)).Val(); l != 0 {
+		if l := r.LLen(context.Background(), base.ActiveKey(base.DefaultQueueName)).Val(); l != 0 {
 			t.Errorf("%s: %q has %d tasks, want 0", base.ActiveKey(base.DefaultQueueName), tc.desc, l)
 		}
 
@@ -449,6 +438,180 @@ func TestProcessorRetry(t *testing.T) {
 	}
 }
 
+func TestProcessorMarkAsComplete(t *testing.T) {
+	r := setup(t)
+	defer r.Close()
+	rdbClient := rdb.NewRDB(r)
+
+	msg1 := h.NewTaskMessage("one", nil)
+	msg2 := h.NewTaskMessage("two", nil)
+	msg3 := h.NewTaskMessageWithQueue("three", nil, "custom")
+	msg1.Retention = 3600
+	msg3.Retention = 7200
+
+	handler := func(ctx context.Context, task *Task) error { return nil }
+
+	tests := []struct {
+		pending       map[string][]*base.TaskMessage
+		completed     map[string][]base.Z
+		queueCfg      map[string]int
+		wantPending   map[string][]*base.TaskMessage
+		wantCompleted func(completedAt time.Time) map[string][]base.Z
+	}{
+		{
+			pending: map[string][]*base.TaskMessage{
+				"default": {msg1, msg2},
+				"custom":  {msg3},
+			},
+			completed: map[string][]base.Z{
+				"default": {},
+				"custom":  {},
+			},
+			queueCfg: map[string]int{
+				"default": 1,
+				"custom":  1,
+			},
+			wantPending: map[string][]*base.TaskMessage{
+				"default": {},
+				"custom":  {},
+			},
+			wantCompleted: func(completedAt time.Time) map[string][]base.Z {
+				return map[string][]base.Z{
+					"default": {{Message: h.TaskMessageWithCompletedAt(*msg1, completedAt), Score: completedAt.Unix() + msg1.Retention}},
+					"custom":  {{Message: h.TaskMessageWithCompletedAt(*msg3, completedAt), Score: completedAt.Unix() + msg3.Retention}},
+				}
+			},
+		},
+	}
+
+	for _, tc := range tests {
+		h.FlushDB(t, r)
+		h.SeedAllPendingQueues(t, r, tc.pending)
+		h.SeedAllCompletedQueues(t, r, tc.completed)
+
+		p := newProcessorForTest(t, rdbClient, HandlerFunc(handler))
+		p.queueConfig = tc.queueCfg
+
+		p.start(&sync.WaitGroup{})
+		runTime := time.Now() // time when processor is running
+		time.Sleep(2 * time.Second)
+		p.shutdown()
+
+		for qname, want := range tc.wantPending {
+			gotPending := h.GetPendingMessages(t, r, qname)
+			if diff := cmp.Diff(want, gotPending, cmpopts.EquateEmpty()); diff != "" {
+				t.Errorf("diff found in %q pending set; want=%v, got=%v\n%s", qname, want, gotPending, diff)
+			}
+		}
+
+		for qname, want := range tc.wantCompleted(runTime) {
+			gotCompleted := h.GetCompletedEntries(t, r, qname)
+			if diff := cmp.Diff(want, gotCompleted, cmpopts.EquateEmpty()); diff != "" {
+				t.Errorf("diff found in %q completed set; want=%v, got=%v\n%s", qname, want, gotCompleted, diff)
+			}
+		}
+	}
+}
+
+// Test a scenario where the worker server cannot communicate with redis due to a network failure
+// and the lease expires
+func TestProcessorWithExpiredLease(t *testing.T) {
+	r := setup(t)
+	defer r.Close()
+	rdbClient := rdb.NewRDB(r)
+
+	m1 := h.NewTaskMessage("task1", nil)
+
+	tests := []struct {
+		pending      []*base.TaskMessage
+		handler      Handler
+		wantErrCount int
+	}{
+		{
+			pending: []*base.TaskMessage{m1},
+			handler: HandlerFunc(func(ctx context.Context, task *Task) error {
+				// make sure the task processing time exceeds lease duration
+				// to test expired lease.
+				time.Sleep(rdb.LeaseDuration + 10*time.Second)
+				return nil
+			}),
+			wantErrCount: 1, // ErrorHandler should still be called with ErrLeaseExpired
+		},
+	}
+
+	for _, tc := range tests {
+		h.FlushDB(t, r)
+		h.SeedPendingQueue(t, r, tc.pending, base.DefaultQueueName)
+
+		starting := make(chan *workerInfo)
+		finished := make(chan *base.TaskMessage)
+		syncCh := make(chan *syncRequest)
+		done := make(chan struct{})
+		t.Cleanup(func() { close(done) })
+		// fake heartbeater which notifies lease expiration
+		go func() {
+			for {
+				select {
+				case w := <-starting:
+					// simulate expiration by resetting to some time in the past
+					w.lease.Reset(time.Now().Add(-5 * time.Second))
+					if !w.lease.NotifyExpiration() {
+						panic("Failed to notifiy lease expiration")
+					}
+				case <-finished:
+					// do nothing
+				case <-done:
+					return
+				}
+			}
+		}()
+		go fakeSyncer(syncCh, done)
+		p := newProcessor(processorParams{
+			logger:            testLogger,
+			broker:            rdbClient,
+			baseCtxFn:         context.Background,
+			taskCheckInterval: defaultTaskCheckInterval,
+			retryDelayFunc:    DefaultRetryDelayFunc,
+			isFailureFunc:     defaultIsFailureFunc,
+			syncCh:            syncCh,
+			cancelations:      base.NewCancelations(),
+			concurrency:       10,
+			queues:            defaultQueueConfig,
+			strictPriority:    false,
+			errHandler:        nil,
+			shutdownTimeout:   defaultShutdownTimeout,
+			starting:          starting,
+			finished:          finished,
+		})
+		p.handler = tc.handler
+		var (
+			mu   sync.Mutex // guards n and errs
+			n    int        // number of times error handler is called
+			errs []error    // error passed to error handler
+		)
+		p.errHandler = ErrorHandlerFunc(func(ctx context.Context, t *Task, err error) {
+			mu.Lock()
+			defer mu.Unlock()
+			n++
+			errs = append(errs, err)
+		})
+
+		p.start(&sync.WaitGroup{})
+		time.Sleep(4 * time.Second)
+		p.shutdown()
+
+		if n != tc.wantErrCount {
+			t.Errorf("Unexpected number of error count: got %d, want %d", n, tc.wantErrCount)
+			continue
+		}
+		for i := 0; i < tc.wantErrCount; i++ {
+			if !errors.Is(errs[i], ErrLeaseExpired) {
+				t.Errorf("Unexpected error was passed to ErrorHandler: got %v want %v", errs[i], ErrLeaseExpired)
+			}
+		}
+	}
+}
+
 func TestProcessorQueues(t *testing.T) {
 	sortOpt := cmp.Transformer("SortStrings", func(in []string) []string {
 		out := append([]string(nil), in...) // Copy input to avoid mutating it
@@ -477,25 +640,10 @@ func TestProcessorQueues(t *testing.T) {
 	}
 
 	for _, tc := range tests {
-		starting := make(chan *workerInfo)
-		finished := make(chan *base.TaskMessage)
-		done := make(chan struct{})
-		defer func() { close(done) }()
-		go fakeHeartbeater(starting, finished, done)
-		p := newProcessor(processorParams{
-			logger:          testLogger,
-			broker:          nil,
-			retryDelayFunc:  DefaultRetryDelayFunc,
-			syncCh:          nil,
-			cancelations:    base.NewCancelations(),
-			concurrency:     10,
-			queues:          tc.queueCfg,
-			strictPriority:  false,
-			errHandler:      nil,
-			shutdownTimeout: defaultShutdownTimeout,
-			starting:        starting,
-			finished:        finished,
-		})
+		// Note: rdb and handler not needed for this test.
+		p := newProcessorForTest(t, nil, nil)
+		p.queueConfig = tc.queueCfg
+
 		got := p.queues()
 		if diff := cmp.Diff(tc.want, got, sortOpt); diff != "" {
 			t.Errorf("with queue config: %v\n(*processor).queues() = %v, want %v\n(-want,+got):\n%s",
@@ -574,18 +722,21 @@ func TestProcessorWithStrictPriority(t *testing.T) {
 		go fakeHeartbeater(starting, finished, done)
 		go fakeSyncer(syncCh, done)
 		p := newProcessor(processorParams{
-			logger:          testLogger,
-			broker:          rdbClient,
-			retryDelayFunc:  DefaultRetryDelayFunc,
-			syncCh:          syncCh,
-			cancelations:    base.NewCancelations(),
-			concurrency:     1, // Set concurrency to 1 to make sure tasks are processed one at a time.
-			queues:          queueCfg,
-			strictPriority:  true,
-			errHandler:      nil,
-			shutdownTimeout: defaultShutdownTimeout,
-			starting:        starting,
-			finished:        finished,
+			logger:            testLogger,
+			broker:            rdbClient,
+			baseCtxFn:         context.Background,
+			taskCheckInterval: defaultTaskCheckInterval,
+			retryDelayFunc:    DefaultRetryDelayFunc,
+			isFailureFunc:     defaultIsFailureFunc,
+			syncCh:            syncCh,
+			cancelations:      base.NewCancelations(),
+			concurrency:       1, // Set concurrency to 1 to make sure tasks are processed one at a time.
+			queues:            queueCfg,
+			strictPriority:    true,
+			errHandler:        nil,
+			shutdownTimeout:   defaultShutdownTimeout,
+			starting:          starting,
+			finished:          finished,
 		})
 		p.handler = HandlerFunc(handler)
 
@@ -593,13 +744,13 @@ func TestProcessorWithStrictPriority(t *testing.T) {
 		time.Sleep(tc.wait)
 		// Make sure no tasks are stuck in active list.
 		for _, qname := range tc.queues {
-			if l := r.LLen(base.ActiveKey(qname)).Val(); l != 0 {
+			if l := r.LLen(context.Background(), base.ActiveKey(qname)).Val(); l != 0 {
 				t.Errorf("%q has %d tasks, want 0", base.ActiveKey(qname), l)
 			}
 		}
 		p.shutdown()
 
-		if diff := cmp.Diff(tc.wantProcessed, processed, sortTaskOpt, cmp.AllowUnexported(Task{})); diff != "" {
+		if diff := cmp.Diff(tc.wantProcessed, processed, taskCmpOpts...); diff != "" {
 			t.Errorf("mismatch found in processed tasks; (-want, +got)\n%s", diff)
 		}
 
@@ -638,12 +789,9 @@ func TestProcessorPerform(t *testing.T) {
 			wantErr: true,
 		},
 	}
-	// Note: We don't need to fully initialize the processor since we are only testing
+	// Note: We don't need to fully initialized the processor since we are only testing
 	// perform method.
-	p := newProcessor(processorParams{
-		logger: testLogger,
-		queues: defaultQueueConfig,
-	})
+	p := newProcessorForTest(t, nil, nil)
 
 	for _, tc := range tests {
 		p.handler = tc.handler
@@ -738,3 +886,111 @@ func TestNormalizeQueues(t *testing.T) {
 		}
 	}
 }
+
+func TestProcessorComputeDeadline(t *testing.T) {
+	now := time.Now()
+	p := processor{
+		logger: log.NewLogger(nil),
+		clock:  timeutil.NewSimulatedClock(now),
+	}
+
+	tests := []struct {
+		desc string
+		msg  *base.TaskMessage
+		want time.Time
+	}{
+		{
+			desc: "message with only timeout specified",
+			msg: &base.TaskMessage{
+				Timeout: int64((30 * time.Minute).Seconds()),
+			},
+			want: now.Add(30 * time.Minute),
+		},
+		{
+			desc: "message with only deadline specified",
+			msg: &base.TaskMessage{
+				Deadline: now.Add(24 * time.Hour).Unix(),
+			},
+			want: now.Add(24 * time.Hour),
+		},
+		{
+			desc: "message with both timeout and deadline set (now+timeout < deadline)",
+			msg: &base.TaskMessage{
+				Deadline: now.Add(24 * time.Hour).Unix(),
+				Timeout:  int64((30 * time.Minute).Seconds()),
+			},
+			want: now.Add(30 * time.Minute),
+		},
+		{
+			desc: "message with both timeout and deadline set (now+timeout > deadline)",
+			msg: &base.TaskMessage{
+				Deadline: now.Add(10 * time.Minute).Unix(),
+				Timeout:  int64((30 * time.Minute).Seconds()),
+			},
+			want: now.Add(10 * time.Minute),
+		},
+		{
+			desc: "message with both timeout and deadline set (now+timeout == deadline)",
+			msg: &base.TaskMessage{
+				Deadline: now.Add(30 * time.Minute).Unix(),
+				Timeout:  int64((30 * time.Minute).Seconds()),
+			},
+			want: now.Add(30 * time.Minute),
+		},
+		{
+			desc: "message without timeout and deadline",
+			msg:  &base.TaskMessage{},
+			want: now.Add(defaultTimeout),
+		},
+	}
+
+	for _, tc := range tests {
+		got := p.computeDeadline(tc.msg)
+		// Compare the Unix epoch with seconds granularity
+		if got.Unix() != tc.want.Unix() {
+			t.Errorf("%s: got=%v, want=%v", tc.desc, got.Unix(), tc.want.Unix())
+		}
+	}
+}
+
+func TestReturnPanicError(t *testing.T) {
+
+	task := NewTask("gen_thumbnail", h.JSON(map[string]interface{}{"src": "some/img/path"}))
+
+	tests := []struct {
+		name         string
+		handler      HandlerFunc
+		IsPanicError bool
+	}{
+		{
+			name: "should return panic error when occurred panic recovery",
+			handler: func(ctx context.Context, t *Task) error {
+				panic("something went terribly wrong")
+			},
+			IsPanicError: true,
+		},
+		{
+			name: "should return normal error when don't occur panic recovery",
+			handler: func(ctx context.Context, t *Task) error {
+				return fmt.Errorf("something went terribly wrong")
+			},
+			IsPanicError: false,
+		},
+	}
+
+	for _, tc := range tests {
+		t.Run(tc.name, func(t *testing.T) {
+			p := processor{
+				logger:  log.NewLogger(nil),
+				handler: tc.handler,
+			}
+			got := p.perform(context.Background(), task)
+			if tc.IsPanicError != IsPanicError(got) {
+				t.Errorf("%s: got=%t, want=%t", tc.name, IsPanicError(got), tc.IsPanicError)
+			}
+			if tc.IsPanicError && !strings.HasPrefix(got.Error(), "panic error cause by:") {
+				t.Error("wrong text msg for panic error")
+			}
+		})
+	}
+}

recoverer.go

@@ -5,11 +5,12 @@
 package asynq
 
 import (
-	"fmt"
+	"context"
 	"sync"
 	"time"
 
 	"github.com/hibiken/asynq/internal/base"
+	"github.com/hibiken/asynq/internal/errors"
 	"github.com/hibiken/asynq/internal/log"
 )
 
@@ -17,6 +18,7 @@ type recoverer struct {
 	logger         *log.Logger
 	broker         base.Broker
 	retryDelayFunc RetryDelayFunc
+	isFailureFunc  func(error) bool
 
 	// channel to communicate back to the long running "recoverer" goroutine.
 	done chan struct{}
@@ -34,6 +36,7 @@ type recovererParams struct {
 	queues         []string
 	interval       time.Duration
 	retryDelayFunc RetryDelayFunc
+	isFailureFunc  func(error) bool
 }
 
 func newRecoverer(params recovererParams) *recoverer {
@@ -44,6 +47,7 @@ func newRecoverer(params recovererParams) *recoverer {
 		queues:         params.queues,
 		interval:       params.interval,
 		retryDelayFunc: params.retryDelayFunc,
+		isFailureFunc:  params.isFailureFunc,
 	}
 }
 
@@ -73,34 +77,50 @@ func (r *recoverer) start(wg *sync.WaitGroup) {
 	}()
 }
 
+// ErrLeaseExpired error indicates that the task failed because the worker working on the task
+// could not extend its lease due to missing heartbeats. The worker may have crashed or got cutoff from the network.
+var ErrLeaseExpired = errors.New("asynq: task lease expired")
+
 func (r *recoverer) recover() {
-	// Get all tasks which have expired 30 seconds ago or earlier.
-	deadline := time.Now().Add(-30 * time.Second)
-	msgs, err := r.broker.ListDeadlineExceeded(deadline, r.queues...)
+	r.recoverLeaseExpiredTasks()
+	r.recoverStaleAggregationSets()
+}
+
+func (r *recoverer) recoverLeaseExpiredTasks() {
+	// Get all tasks which have expired 30 seconds ago or earlier to accommodate certain amount of clock skew.
+	cutoff := time.Now().Add(-30 * time.Second)
+	msgs, err := r.broker.ListLeaseExpired(cutoff, r.queues...)
 	if err != nil {
-		r.logger.Warn("recoverer: could not list deadline exceeded tasks")
+		r.logger.Warnf("recoverer: could not list lease expired tasks: %v", err)
 		return
 	}
-	const errMsg = "deadline exceeded"
 	for _, msg := range msgs {
 		if msg.Retried >= msg.Retry {
-			r.archive(msg, errMsg)
+			r.archive(msg, ErrLeaseExpired)
 		} else {
-			r.retry(msg, errMsg)
+			r.retry(msg, ErrLeaseExpired)
 		}
 	}
 }
 
-func (r *recoverer) retry(msg *base.TaskMessage, errMsg string) {
-	delay := r.retryDelayFunc(msg.Retried, fmt.Errorf(errMsg), NewTask(msg.Type, msg.Payload))
-	retryAt := time.Now().Add(delay)
-	if err := r.broker.Retry(msg, retryAt, errMsg); err != nil {
-		r.logger.Warnf("recoverer: could not retry deadline exceeded task: %v", err)
+func (r *recoverer) recoverStaleAggregationSets() {
+	for _, qname := range r.queues {
+		if err := r.broker.ReclaimStaleAggregationSets(qname); err != nil {
+			r.logger.Warnf("recoverer: could not reclaim stale aggregation sets in queue %q: %v", qname, err)
+		}
 	}
 }
 
-func (r *recoverer) archive(msg *base.TaskMessage, errMsg string) {
-	if err := r.broker.Archive(msg, errMsg); err != nil {
+func (r *recoverer) retry(msg *base.TaskMessage, err error) {
+	delay := r.retryDelayFunc(msg.Retried, err, NewTask(msg.Type, msg.Payload))
+	retryAt := time.Now().Add(delay)
+	if err := r.broker.Retry(context.Background(), msg, retryAt, err.Error(), r.isFailureFunc(err)); err != nil {
+		r.logger.Warnf("recoverer: could not retry lease expired task: %v", err)
+	}
+}
+
+func (r *recoverer) archive(msg *base.TaskMessage, err error) {
+	if err := r.broker.Archive(context.Background(), msg, err.Error()); err != nil {
 		r.logger.Warnf("recoverer: could not move task to archive: %v", err)
 	}
 }

recoverer_test.go

@@ -10,9 +10,9 @@ import (
 	"time"
 
 	"github.com/google/go-cmp/cmp"
-	h "github.com/hibiken/asynq/internal/asynqtest"
 	"github.com/hibiken/asynq/internal/base"
 	"github.com/hibiken/asynq/internal/rdb"
+	h "github.com/hibiken/asynq/internal/testutil"
 )
 
 func TestRecoverer(t *testing.T) {
@@ -27,29 +27,25 @@ func TestRecoverer(t *testing.T) {
 	t4.Retried = t4.Retry // t4 has reached its max retry count
 
 	now := time.Now()
-	oneHourFromNow := now.Add(1 * time.Hour)
-	fiveMinutesFromNow := now.Add(5 * time.Minute)
-	fiveMinutesAgo := now.Add(-5 * time.Minute)
-	oneHourAgo := now.Add(-1 * time.Hour)
 
 	tests := []struct {
-		desc          string
-		inProgress    map[string][]*base.TaskMessage
-		deadlines     map[string][]base.Z
-		retry         map[string][]base.Z
-		archived      map[string][]base.Z
-		wantActive    map[string][]*base.TaskMessage
-		wantDeadlines map[string][]base.Z
-		wantRetry     map[string][]*base.TaskMessage
-		wantArchived  map[string][]*base.TaskMessage
+		desc         string
+		active       map[string][]*base.TaskMessage
+		lease        map[string][]base.Z
+		retry        map[string][]base.Z
+		archived     map[string][]base.Z
+		wantActive   map[string][]*base.TaskMessage
+		wantLease    map[string][]base.Z
+		wantRetry    map[string][]*base.TaskMessage
+		wantArchived map[string][]*base.TaskMessage
 	}{
 		{
 			desc: "with one active task",
-			inProgress: map[string][]*base.TaskMessage{
+			active: map[string][]*base.TaskMessage{
 				"default": {t1},
 			},
-			deadlines: map[string][]base.Z{
-				"default": {{Message: t1, Score: fiveMinutesAgo.Unix()}},
+			lease: map[string][]base.Z{
+				"default": {{Message: t1, Score: now.Add(-1 * time.Minute).Unix()}},
 			},
 			retry: map[string][]base.Z{
 				"default": {},
@@ -60,7 +56,7 @@ func TestRecoverer(t *testing.T) {
 			wantActive: map[string][]*base.TaskMessage{
 				"default": {},
 			},
-			wantDeadlines: map[string][]base.Z{
+			wantLease: map[string][]base.Z{
 				"default": {},
 			},
 			wantRetry: map[string][]*base.TaskMessage{
@@ -72,12 +68,12 @@ func TestRecoverer(t *testing.T) {
 		},
 		{
 			desc: "with a task with max-retry reached",
-			inProgress: map[string][]*base.TaskMessage{
+			active: map[string][]*base.TaskMessage{
 				"default":  {t4},
 				"critical": {},
 			},
-			deadlines: map[string][]base.Z{
-				"default":  {{Message: t4, Score: fiveMinutesAgo.Unix()}},
+			lease: map[string][]base.Z{
+				"default":  {{Message: t4, Score: now.Add(-40 * time.Second).Unix()}},
 				"critical": {},
 			},
 			retry: map[string][]base.Z{
@@ -92,7 +88,7 @@ func TestRecoverer(t *testing.T) {
 				"default":  {},
 				"critical": {},
 			},
-			wantDeadlines: map[string][]base.Z{
+			wantLease: map[string][]base.Z{
 				"default":  {},
 				"critical": {},
 			},
@@ -107,17 +103,17 @@ func TestRecoverer(t *testing.T) {
 		},
 		{
 			desc: "with multiple active tasks, and one expired",
-			inProgress: map[string][]*base.TaskMessage{
+			active: map[string][]*base.TaskMessage{
 				"default":  {t1, t2},
 				"critical": {t3},
 			},
-			deadlines: map[string][]base.Z{
+			lease: map[string][]base.Z{
 				"default": {
-					{Message: t1, Score: oneHourAgo.Unix()},
-					{Message: t2, Score: fiveMinutesFromNow.Unix()},
+					{Message: t1, Score: now.Add(-2 * time.Minute).Unix()},
+					{Message: t2, Score: now.Add(20 * time.Second).Unix()},
 				},
 				"critical": {
-					{Message: t3, Score: oneHourFromNow.Unix()},
+					{Message: t3, Score: now.Add(20 * time.Second).Unix()},
 				},
 			},
 			retry: map[string][]base.Z{
@@ -132,9 +128,9 @@ func TestRecoverer(t *testing.T) {
 				"default":  {t2},
 				"critical": {t3},
 			},
-			wantDeadlines: map[string][]base.Z{
-				"default":  {{Message: t2, Score: fiveMinutesFromNow.Unix()}},
-				"critical": {{Message: t3, Score: oneHourFromNow.Unix()}},
+			wantLease: map[string][]base.Z{
+				"default":  {{Message: t2, Score: now.Add(20 * time.Second).Unix()}},
+				"critical": {{Message: t3, Score: now.Add(20 * time.Second).Unix()}},
 			},
 			wantRetry: map[string][]*base.TaskMessage{
 				"default":  {t1},
@@ -147,17 +143,17 @@ func TestRecoverer(t *testing.T) {
 		},
 		{
 			desc: "with multiple expired active tasks",
-			inProgress: map[string][]*base.TaskMessage{
+			active: map[string][]*base.TaskMessage{
 				"default":  {t1, t2},
 				"critical": {t3},
 			},
-			deadlines: map[string][]base.Z{
+			lease: map[string][]base.Z{
 				"default": {
-					{Message: t1, Score: oneHourAgo.Unix()},
-					{Message: t2, Score: oneHourFromNow.Unix()},
+					{Message: t1, Score: now.Add(-1 * time.Minute).Unix()},
+					{Message: t2, Score: now.Add(10 * time.Second).Unix()},
 				},
 				"critical": {
-					{Message: t3, Score: fiveMinutesAgo.Unix()},
+					{Message: t3, Score: now.Add(-1 * time.Minute).Unix()},
 				},
 			},
 			retry: map[string][]base.Z{
@@ -172,8 +168,8 @@ func TestRecoverer(t *testing.T) {
 				"default":  {t2},
 				"critical": {},
 			},
-			wantDeadlines: map[string][]base.Z{
-				"default": {{Message: t2, Score: oneHourFromNow.Unix()}},
+			wantLease: map[string][]base.Z{
+				"default": {{Message: t2, Score: now.Add(10 * time.Second).Unix()}},
 			},
 			wantRetry: map[string][]*base.TaskMessage{
 				"default":  {t1},
@@ -186,11 +182,11 @@ func TestRecoverer(t *testing.T) {
 		},
 		{
 			desc: "with empty active queue",
-			inProgress: map[string][]*base.TaskMessage{
+			active: map[string][]*base.TaskMessage{
 				"default":  {},
 				"critical": {},
 			},
-			deadlines: map[string][]base.Z{
+			lease: map[string][]base.Z{
 				"default":  {},
 				"critical": {},
 			},
@@ -206,7 +202,7 @@ func TestRecoverer(t *testing.T) {
 				"default":  {},
 				"critical": {},
 			},
-			wantDeadlines: map[string][]base.Z{
+			wantLease: map[string][]base.Z{
 				"default":  {},
 				"critical": {},
 			},
@@ -223,8 +219,8 @@ func TestRecoverer(t *testing.T) {
 
 	for _, tc := range tests {
 		h.FlushDB(t, r)
-		h.SeedAllActiveQueues(t, r, tc.inProgress)
-		h.SeedAllDeadlines(t, r, tc.deadlines)
+		h.SeedAllActiveQueues(t, r, tc.active)
+		h.SeedAllLease(t, r, tc.lease)
 		h.SeedAllRetryQueues(t, r, tc.retry)
 		h.SeedAllArchivedQueues(t, r, tc.archived)
 
@@ -234,6 +230,7 @@ func TestRecoverer(t *testing.T) {
 			queues:         []string{"default", "critical"},
 			interval:       1 * time.Second,
 			retryDelayFunc: func(n int, err error, task *Task) time.Duration { return 30 * time.Second },
+			isFailureFunc:  defaultIsFailureFunc,
 		})
 
 		var wg sync.WaitGroup
@@ -248,10 +245,10 @@ func TestRecoverer(t *testing.T) {
 				t.Errorf("%s; mismatch found in %q; (-want,+got)\n%s", tc.desc, base.ActiveKey(qname), diff)
 			}
 		}
-		for qname, want := range tc.wantDeadlines {
-			gotDeadlines := h.GetDeadlinesEntries(t, r, qname)
-			if diff := cmp.Diff(want, gotDeadlines, h.SortZSetEntryOpt); diff != "" {
-				t.Errorf("%s; mismatch found in %q; (-want,+got)\n%s", tc.desc, base.DeadlinesKey(qname), diff)
+		for qname, want := range tc.wantLease {
+			gotLease := h.GetLeaseEntries(t, r, qname)
+			if diff := cmp.Diff(want, gotLease, h.SortZSetEntryOpt); diff != "" {
+				t.Errorf("%s; mismatch found in %q; (-want,+got)\n%s", tc.desc, base.LeaseKey(qname), diff)
 			}
 		}
 		cmpOpt := h.EquateInt64Approx(2) // allow up to two-second difference in `LastFailedAt`
@@ -259,7 +256,7 @@ func TestRecoverer(t *testing.T) {
 			gotRetry := h.GetRetryMessages(t, r, qname)
 			var wantRetry []*base.TaskMessage // Note: construct message here since `LastFailedAt` is relative to each test run
 			for _, msg := range msgs {
-				wantRetry = append(wantRetry, h.TaskMessageAfterRetry(*msg, "deadline exceeded", runTime))
+				wantRetry = append(wantRetry, h.TaskMessageAfterRetry(*msg, ErrLeaseExpired.Error(), runTime))
 			}
 			if diff := cmp.Diff(wantRetry, gotRetry, h.SortMsgOpt, cmpOpt); diff != "" {
 				t.Errorf("%s; mismatch found in %q: (-want, +got)\n%s", tc.desc, base.RetryKey(qname), diff)
@@ -269,7 +266,7 @@ func TestRecoverer(t *testing.T) {
 			gotArchived := h.GetArchivedMessages(t, r, qname)
 			var wantArchived []*base.TaskMessage
 			for _, msg := range msgs {
-				wantArchived = append(wantArchived, h.TaskMessageWithError(*msg, "deadline exceeded", runTime))
+				wantArchived = append(wantArchived, h.TaskMessageWithError(*msg, ErrLeaseExpired.Error(), runTime))
 			}
 			if diff := cmp.Diff(wantArchived, gotArchived, h.SortMsgOpt, cmpOpt); diff != "" {
 				t.Errorf("%s; mismatch found in %q: (-want, +got)\n%s", tc.desc, base.ArchivedKey(qname), diff)

scheduler.go

@@ -10,43 +10,84 @@ import (
 	"sync"
 	"time"
 
-	"github.com/go-redis/redis/v7"
 	"github.com/google/uuid"
 	"github.com/hibiken/asynq/internal/base"
 	"github.com/hibiken/asynq/internal/log"
 	"github.com/hibiken/asynq/internal/rdb"
+	"github.com/redis/go-redis/v9"
 	"github.com/robfig/cron/v3"
 )
 
 // A Scheduler kicks off tasks at regular intervals based on the user defined schedule.
+//
+// Schedulers are safe for concurrent use by multiple goroutines.
 type Scheduler struct {
-	id         string
-	state      *base.ServerState
-	logger     *log.Logger
-	client     *Client
-	rdb        *rdb.RDB
-	cron       *cron.Cron
-	location   *time.Location
-	done       chan struct{}
-	wg         sync.WaitGroup
-	errHandler func(task *Task, opts []Option, err error)
+	id string
+
+	state *serverState
+
+	heartbeatInterval time.Duration
+	logger            *log.Logger
+	client            *Client
+	rdb               *rdb.RDB
+	cron              *cron.Cron
+	location          *time.Location
+	done              chan struct{}
+	wg                sync.WaitGroup
+	preEnqueueFunc    func(task *Task, opts []Option)
+	postEnqueueFunc   func(info *TaskInfo, err error)
+	errHandler        func(task *Task, opts []Option, err error)
+
+	// guards idmap
+	mu sync.Mutex
 	// idmap maps Scheduler's entry ID to cron.EntryID
 	// to avoid using cron.EntryID as the public API of
 	// the Scheduler.
 	idmap map[string]cron.EntryID
 }
 
+const defaultHeartbeatInterval = 10 * time.Second
+
 // NewScheduler returns a new Scheduler instance given the redis connection option.
 // The parameter opts is optional, defaults will be used if opts is set to nil
 func NewScheduler(r RedisConnOpt, opts *SchedulerOpts) *Scheduler {
-	c, ok := r.MakeRedisClient().(redis.UniversalClient)
+	scheduler := newScheduler(opts)
+
+	redisClient, ok := r.MakeRedisClient().(redis.UniversalClient)
 	if !ok {
 		panic(fmt.Sprintf("asynq: unsupported RedisConnOpt type %T", r))
 	}
+
+	rdb := rdb.NewRDB(redisClient)
+
+	scheduler.rdb = rdb
+	scheduler.client = &Client{broker: rdb, sharedConnection: false}
+
+	return scheduler
+}
+
+// NewSchedulerFromRedisClient returns a new instance of Scheduler given a redis.UniversalClient
+// The parameter opts is optional, defaults will be used if opts is set to nil.
+// Warning: The underlying redis connection pool will not be closed by Asynq, you are responsible for closing it.
+func NewSchedulerFromRedisClient(c redis.UniversalClient, opts *SchedulerOpts) *Scheduler {
+	scheduler := newScheduler(opts)
+
+	scheduler.rdb = rdb.NewRDB(c)
+	scheduler.client = NewClientFromRedisClient(c)
+
+	return scheduler
+}
+
+func newScheduler(opts *SchedulerOpts) *Scheduler {
 	if opts == nil {
 		opts = &SchedulerOpts{}
 	}
 
+	heartbeatInterval := opts.HeartbeatInterval
+	if heartbeatInterval <= 0 {
+		heartbeatInterval = defaultHeartbeatInterval
+	}
+
 	logger := log.NewLogger(opts.Logger)
 	loglevel := opts.LogLevel
 	if loglevel == level_unspecified {
@@ -60,16 +101,17 @@ func NewScheduler(r RedisConnOpt, opts *SchedulerOpts) *Scheduler {
 	}
 
 	return &Scheduler{
-		id:         generateSchedulerID(),
-		state:      base.NewServerState(),
-		logger:     logger,
-		client:     NewClient(r),
-		rdb:        rdb.NewRDB(c),
-		cron:       cron.New(cron.WithLocation(loc)),
-		location:   loc,
-		done:       make(chan struct{}),
-		errHandler: opts.EnqueueErrorHandler,
-		idmap:      make(map[string]cron.EntryID),
+		id:                generateSchedulerID(),
+		state:             &serverState{value: srvStateNew},
+		heartbeatInterval: heartbeatInterval,
+		logger:            logger,
+		cron:              cron.New(cron.WithLocation(loc)),
+		location:          loc,
+		done:              make(chan struct{}),
+		preEnqueueFunc:    opts.PreEnqueueFunc,
+		postEnqueueFunc:   opts.PostEnqueueFunc,
+		errHandler:        opts.EnqueueErrorHandler,
+		idmap:             make(map[string]cron.EntryID),
 	}
 }
 
@@ -83,6 +125,15 @@ func generateSchedulerID() string {
 
 // SchedulerOpts specifies scheduler options.
 type SchedulerOpts struct {
+	// HeartbeatInterval specifies the interval between scheduler heartbeats.
+	//
+	// If unset, zero or a negative value, the interval is set to 10 second.
+	//
+	// Note: Setting this value too low may add significant load to redis.
+	//
+	// By default, HeartbeatInterval is set to 10 seconds.
+	HeartbeatInterval time.Duration
+
 	// Logger specifies the logger used by the scheduler instance.
 	//
 	// If unset, the default logger is used.
@@ -98,28 +149,44 @@ type SchedulerOpts struct {
 	// If unset, the UTC time zone (time.UTC) is used.
 	Location *time.Location
 
+	// PreEnqueueFunc, if provided, is called before a task gets enqueued by Scheduler.
+	// The callback function should return quickly to not block the current thread.
+	PreEnqueueFunc func(task *Task, opts []Option)
+
+	// PostEnqueueFunc, if provided, is called after a task gets enqueued by Scheduler.
+	// The callback function should return quickly to not block the current thread.
+	PostEnqueueFunc func(info *TaskInfo, err error)
+
+	// Deprecated: Use PostEnqueueFunc instead
 	// EnqueueErrorHandler gets called when scheduler cannot enqueue a registered task
 	// due to an error.
 	EnqueueErrorHandler func(task *Task, opts []Option, err error)
 }
 
-// enqueueJob encapsulates the job of enqueing a task and recording the event.
+// enqueueJob encapsulates the job of enqueuing a task and recording the event.
 type enqueueJob struct {
-	id         uuid.UUID
-	cronspec   string
-	task       *Task
-	opts       []Option
-	location   *time.Location
-	logger     *log.Logger
-	client     *Client
-	rdb        *rdb.RDB
-	errHandler func(task *Task, opts []Option, err error)
+	id              uuid.UUID
+	cronspec        string
+	task            *Task
+	opts            []Option
+	location        *time.Location
+	logger          *log.Logger
+	client          *Client
+	rdb             *rdb.RDB
+	preEnqueueFunc  func(task *Task, opts []Option)
+	postEnqueueFunc func(info *TaskInfo, err error)
+	errHandler      func(task *Task, opts []Option, err error)
 }
 
 func (j *enqueueJob) Run() {
+	if j.preEnqueueFunc != nil {
+		j.preEnqueueFunc(j.task, j.opts)
+	}
 	info, err := j.client.Enqueue(j.task, j.opts...)
+	if j.postEnqueueFunc != nil {
+		j.postEnqueueFunc(info, err)
+	}
 	if err != nil {
-		j.logger.Errorf("scheduler could not enqueue a task %+v: %v", j.task, err)
 		if j.errHandler != nil {
 			j.errHandler(j.task, j.opts, err)
 		}
@@ -132,7 +199,7 @@ func (j *enqueueJob) Run() {
 	}
 	err = j.rdb.RecordSchedulerEnqueueEvent(j.id.String(), event)
 	if err != nil {
-		j.logger.Errorf("scheduler could not record enqueue event of enqueued task %+v: %v", j.task, err)
+		j.logger.Warnf("scheduler could not record enqueue event of enqueued task %s: %v", info.ID, err)
 	}
 }
 
@@ -140,31 +207,38 @@ func (j *enqueueJob) Run() {
 // It returns an ID of the newly registered entry.
 func (s *Scheduler) Register(cronspec string, task *Task, opts ...Option) (entryID string, err error) {
 	job := &enqueueJob{
-		id:         uuid.New(),
-		cronspec:   cronspec,
-		task:       task,
-		opts:       opts,
-		location:   s.location,
-		client:     s.client,
-		rdb:        s.rdb,
-		logger:     s.logger,
-		errHandler: s.errHandler,
+		id:              uuid.New(),
+		cronspec:        cronspec,
+		task:            task,
+		opts:            opts,
+		location:        s.location,
+		client:          s.client,
+		rdb:             s.rdb,
+		logger:          s.logger,
+		preEnqueueFunc:  s.preEnqueueFunc,
+		postEnqueueFunc: s.postEnqueueFunc,
+		errHandler:      s.errHandler,
 	}
 	cronID, err := s.cron.AddJob(cronspec, job)
 	if err != nil {
 		return "", err
 	}
+	s.mu.Lock()
 	s.idmap[job.id.String()] = cronID
+	s.mu.Unlock()
 	return job.id.String(), nil
 }
 
 // Unregister removes a registered entry by entry ID.
 // Unregister returns a non-nil error if no entries were found for the given entryID.
 func (s *Scheduler) Unregister(entryID string) error {
+	s.mu.Lock()
+	defer s.mu.Unlock()
 	cronID, ok := s.idmap[entryID]
 	if !ok {
 		return fmt.Errorf("asynq: no scheduler entry found")
 	}
+	delete(s.idmap, entryID)
 	s.cron.Remove(cronID)
 	return nil
 }
@@ -183,23 +257,43 @@ func (s *Scheduler) Run() error {
 // Start starts the scheduler.
 // It returns an error if the scheduler is already running or has been shutdown.
 func (s *Scheduler) Start() error {
-	switch s.state.Get() {
-	case base.StateActive:
-		return fmt.Errorf("asynq: the scheduler is already running")
-	case base.StateClosed:
-		return fmt.Errorf("asynq: the scheduler has already been stopped")
+	if err := s.start(); err != nil {
+		return err
 	}
 	s.logger.Info("Scheduler starting")
 	s.logger.Infof("Scheduler timezone is set to %v", s.location)
 	s.cron.Start()
 	s.wg.Add(1)
 	go s.runHeartbeater()
-	s.state.Set(base.StateActive)
+	return nil
+}
+
+// Checks server state and returns an error if pre-condition is not met.
+// Otherwise it sets the server state to active.
+func (s *Scheduler) start() error {
+	s.state.mu.Lock()
+	defer s.state.mu.Unlock()
+	switch s.state.value {
+	case srvStateActive:
+		return fmt.Errorf("asynq: the scheduler is already running")
+	case srvStateClosed:
+		return fmt.Errorf("asynq: the scheduler has already been stopped")
+	}
+	s.state.value = srvStateActive
 	return nil
 }
 
 // Shutdown stops and shuts down the scheduler.
 func (s *Scheduler) Shutdown() {
+	s.state.mu.Lock()
+	if s.state.value == srvStateNew || s.state.value == srvStateClosed {
+		// scheduler is not running, do nothing and return.
+		s.state.mu.Unlock()
+		return
+	}
+	s.state.value = srvStateClosed
+	s.state.mu.Unlock()
+
 	s.logger.Info("Scheduler shutting down")
 	close(s.done) // signal heartbeater to stop
 	ctx := s.cron.Stop()
@@ -207,20 +301,23 @@ func (s *Scheduler) Shutdown() {
 	s.wg.Wait()
 
 	s.clearHistory()
-	s.client.Close()
-	s.rdb.Close()
-	s.state.Set(base.StateClosed)
+	if err := s.client.Close(); err != nil {
+		s.logger.Errorf("Failed to close redis client connection: %v", err)
+	}
 	s.logger.Info("Scheduler stopped")
 }
 
 func (s *Scheduler) runHeartbeater() {
 	defer s.wg.Done()
-	ticker := time.NewTicker(5 * time.Second)
+	ticker := time.NewTicker(s.heartbeatInterval)
 	for {
 		select {
 		case <-s.done:
 			s.logger.Debugf("Scheduler heatbeater shutting down")
-			s.rdb.ClearSchedulerEntries(s.id)
+			if err := s.rdb.ClearSchedulerEntries(s.id); err != nil {
+				s.logger.Errorf("Failed to clear the scheduler entries: %v", err)
+			}
+			ticker.Stop()
 			return
 		case <-ticker.C:
 			s.beat()
@@ -244,8 +341,7 @@ func (s *Scheduler) beat() {
 		}
 		entries = append(entries, e)
 	}
-	s.logger.Debugf("Writing entries %v", entries)
-	if err := s.rdb.WriteSchedulerEntries(s.id, entries, 5*time.Second); err != nil {
+	if err := s.rdb.WriteSchedulerEntries(s.id, entries, s.heartbeatInterval*2); err != nil {
 		s.logger.Warnf("Scheduler could not write heartbeat data: %v", err)
 	}
 }
@@ -266,3 +362,14 @@ func (s *Scheduler) clearHistory() {
 		}
 	}
 }
+
+// Ping performs a ping against the redis connection.
+func (s *Scheduler) Ping() error {
+	s.state.mu.Lock()
+	defer s.state.mu.Unlock()
+	if s.state.value == srvStateClosed {
+		return nil
+	}
+
+	return s.rdb.Ping()
+}

scheduler_test.go

@@ -10,8 +10,10 @@ import (
 	"time"
 
 	"github.com/google/go-cmp/cmp"
-	"github.com/hibiken/asynq/internal/asynqtest"
+	"github.com/redis/go-redis/v9"
+
 	"github.com/hibiken/asynq/internal/base"
+	"github.com/hibiken/asynq/internal/testutil"
 )
 
 func TestSchedulerRegister(t *testing.T) {
@@ -57,6 +59,7 @@ func TestSchedulerRegister(t *testing.T) {
 
 	r := setup(t)
 
+	// Tests for new redis connection.
 	for _, tc := range tests {
 		scheduler := NewScheduler(getRedisConnOpt(t), nil)
 		if _, err := scheduler.Register(tc.cronspec, tc.task, tc.opts...); err != nil {
@@ -69,8 +72,30 @@ func TestSchedulerRegister(t *testing.T) {
 		time.Sleep(tc.wait)
 		scheduler.Shutdown()
 
-		got := asynqtest.GetPendingMessages(t, r, tc.queue)
-		if diff := cmp.Diff(tc.want, got, asynqtest.IgnoreIDOpt); diff != "" {
+		got := testutil.GetPendingMessages(t, r, tc.queue)
+		if diff := cmp.Diff(tc.want, got, testutil.IgnoreIDOpt); diff != "" {
+			t.Errorf("mismatch found in queue %q: (-want,+got)\n%s", tc.queue, diff)
+		}
+	}
+
+	r = setup(t)
+
+	// Tests for existing redis connection.
+	for _, tc := range tests {
+		redisClient := getRedisConnOpt(t).MakeRedisClient().(redis.UniversalClient)
+		scheduler := NewSchedulerFromRedisClient(redisClient, nil)
+		if _, err := scheduler.Register(tc.cronspec, tc.task, tc.opts...); err != nil {
+			t.Fatal(err)
+		}
+
+		if err := scheduler.Start(); err != nil {
+			t.Fatal(err)
+		}
+		time.Sleep(tc.wait)
+		scheduler.Shutdown()
+
+		got := testutil.GetPendingMessages(t, r, tc.queue)
+		if diff := cmp.Diff(tc.want, got, testutil.IgnoreIDOpt); diff != "" {
 			t.Errorf("mismatch found in queue %q: (-want,+got)\n%s", tc.queue, diff)
 		}
 	}
@@ -89,7 +114,7 @@ func TestSchedulerWhenRedisDown(t *testing.T) {
 
 	// Connect to non-existent redis instance to simulate a redis server being down.
 	scheduler := NewScheduler(
-		RedisClientOpt{Addr: ":9876"},
+		RedisClientOpt{Addr: ":9876"}, // no Redis listening to this port.
 		&SchedulerOpts{EnqueueErrorHandler: errorHandler},
 	)
 
@@ -148,9 +173,62 @@ func TestSchedulerUnregister(t *testing.T) {
 		time.Sleep(tc.wait)
 		scheduler.Shutdown()
 
-		got := asynqtest.GetPendingMessages(t, r, tc.queue)
+		got := testutil.GetPendingMessages(t, r, tc.queue)
 		if len(got) != 0 {
 			t.Errorf("%d tasks were enqueued, want zero", len(got))
 		}
 	}
 }
+
+func TestSchedulerPostAndPreEnqueueHandler(t *testing.T) {
+	var (
+		preMu       sync.Mutex
+		preCounter  int
+		postMu      sync.Mutex
+		postCounter int
+	)
+	preHandler := func(task *Task, opts []Option) {
+		preMu.Lock()
+		preCounter++
+		preMu.Unlock()
+	}
+	postHandler := func(info *TaskInfo, err error) {
+		postMu.Lock()
+		postCounter++
+		postMu.Unlock()
+	}
+
+	// Connect to non-existent redis instance to simulate a redis server being down.
+	scheduler := NewScheduler(
+		getRedisConnOpt(t),
+		&SchedulerOpts{
+			PreEnqueueFunc:  preHandler,
+			PostEnqueueFunc: postHandler,
+		},
+	)
+
+	task := NewTask("test", nil)
+
+	if _, err := scheduler.Register("@every 3s", task); err != nil {
+		t.Fatal(err)
+	}
+
+	if err := scheduler.Start(); err != nil {
+		t.Fatal(err)
+	}
+	// Scheduler should attempt to enqueue the task three times (every 3s).
+	time.Sleep(10 * time.Second)
+	scheduler.Shutdown()
+
+	preMu.Lock()
+	if preCounter != 3 {
+		t.Errorf("PreEnqueueFunc was called %d times, want 3", preCounter)
+	}
+	preMu.Unlock()
+
+	postMu.Lock()
+	if postCounter != 3 {
+		t.Errorf("PostEnqueueFunc was called %d times, want 3", postCounter)
+	}
+	postMu.Unlock()
+}

servemux.go

@@ -144,9 +144,7 @@ func (mux *ServeMux) HandleFunc(pattern string, handler func(context.Context, *T
 func (mux *ServeMux) Use(mws ...MiddlewareFunc) {
 	mux.mu.Lock()
 	defer mux.mu.Unlock()
-	for _, fn := range mws {
-		mux.mws = append(mux.mws, fn)
-	}
+	mux.mws = append(mux.mws, mws...)
 }
 
 // NotFound returns an error indicating that the handler was not found for the given task.

server.go

@@ -9,16 +9,16 @@ import (
 	"errors"
 	"fmt"
 	"math"
-	"math/rand"
+	"math/rand/v2"
 	"runtime"
 	"strings"
 	"sync"
 	"time"
 
-	"github.com/go-redis/redis/v7"
 	"github.com/hibiken/asynq/internal/base"
 	"github.com/hibiken/asynq/internal/log"
 	"github.com/hibiken/asynq/internal/rdb"
+	"github.com/redis/go-redis/v9"
 )
 
 // Server is responsible for task processing and task lifecycle management.
@@ -37,8 +37,11 @@ type Server struct {
 	logger *log.Logger
 
 	broker base.Broker
+	// When a Server has been created with an existing Redis connection, we do
+	// not want to close it.
+	sharedConnection bool
 
-	state *base.ServerState
+	state *serverState
 
 	// wait group to wait for all goroutines to finish.
 	wg            sync.WaitGroup
@@ -49,6 +52,45 @@ type Server struct {
 	subscriber    *subscriber
 	recoverer     *recoverer
 	healthchecker *healthchecker
+	janitor       *janitor
+	aggregator    *aggregator
+}
+
+type serverState struct {
+	mu    sync.Mutex
+	value serverStateValue
+}
+
+type serverStateValue int
+
+const (
+	// StateNew represents a new server. Server begins in
+	// this state and then transition to StatusActive when
+	// Start or Run is callled.
+	srvStateNew serverStateValue = iota
+
+	// StateActive indicates the server is up and active.
+	srvStateActive
+
+	// StateStopped indicates the server is up but no longer processing new tasks.
+	srvStateStopped
+
+	// StateClosed indicates the server has been shutdown.
+	srvStateClosed
+)
+
+var serverStates = []string{
+	"new",
+	"active",
+	"stopped",
+	"closed",
+}
+
+func (s serverStateValue) String() string {
+	if srvStateNew <= s && s <= srvStateClosed {
+		return serverStates[s]
+	}
+	return "unknown status"
 }
 
 // Config specifies the server's background-task processing behavior.
@@ -56,14 +98,37 @@ type Config struct {
 	// Maximum number of concurrent processing of tasks.
 	//
 	// If set to a zero or negative value, NewServer will overwrite the value
-	// to the number of CPUs usable by the currennt process.
+	// to the number of CPUs usable by the current process.
 	Concurrency int
 
+	// BaseContext optionally specifies a function that returns the base context for Handler invocations on this server.
+	//
+	// If BaseContext is nil, the default is context.Background().
+	// If this is defined, then it MUST return a non-nil context
+	BaseContext func() context.Context
+
+	// TaskCheckInterval specifies the interval between checks for new tasks to process when all queues are empty.
+	//
+	// If unset, zero or a negative value, the interval is set to 1 second.
+	//
+	// Note: Setting this value too low may add significant load to redis.
+	//
+	// By default, TaskCheckInterval is set to 1 seconds.
+	TaskCheckInterval time.Duration
+
 	// Function to calculate retry delay for a failed task.
 	//
 	// By default, it uses exponential backoff algorithm to calculate the delay.
 	RetryDelayFunc RetryDelayFunc
 
+	// Predicate function to determine whether the error returned from Handler is a failure.
+	// If the function returns false, Server will not increment the retried counter for the task,
+	// and Server won't record the queue stats (processed and failed stats) to avoid skewing the error
+	// rate of the queue.
+	//
+	// By default, if the given error is non-nil the function returns true.
+	IsFailure func(error) bool
+
 	// List of queues to process with given priority value. Keys are the names of the
 	// queues and values are associated priority value.
 	//
@@ -109,6 +174,16 @@ type Config struct {
 	//     })
 	//
 	//     ErrorHandler: asynq.ErrorHandlerFunc(reportError)
+
+	//    we can also handle panic error like:
+	//     func reportError(ctx context, task *asynq.Task, err error) {
+	//         if asynq.IsPanic(err) {
+	//	          errorReportingService.Notify(err)
+	// 	       }
+	//     })
+	//
+	//     ErrorHandler: asynq.ErrorHandlerFunc(reportError)
+
 	ErrorHandler ErrorHandler
 
 	// Logger specifies the logger used by the server instance.
@@ -135,9 +210,72 @@ type Config struct {
 	//
 	// If unset or zero, the interval is set to 15 seconds.
 	HealthCheckInterval time.Duration
+
+	// DelayedTaskCheckInterval specifies the interval between checks run on 'scheduled' and 'retry'
+	// tasks, and forwarding them to 'pending' state if they are ready to be processed.
+	//
+	// If unset or zero, the interval is set to 5 seconds.
+	DelayedTaskCheckInterval time.Duration
+
+	// GroupGracePeriod specifies the amount of time the server will wait for an incoming task before aggregating
+	// the tasks in a group. If an incoming task is received within this period, the server will wait for another
+	// period of the same length, up to GroupMaxDelay if specified.
+	//
+	// If unset or zero, the grace period is set to 1 minute.
+	// Minimum duration for GroupGracePeriod is 1 second. If value specified is less than a second, the call to
+	// NewServer will panic.
+	GroupGracePeriod time.Duration
+
+	// GroupMaxDelay specifies the maximum amount of time the server will wait for incoming tasks before aggregating
+	// the tasks in a group.
+	//
+	// If unset or zero, no delay limit is used.
+	GroupMaxDelay time.Duration
+
+	// GroupMaxSize specifies the maximum number of tasks that can be aggregated into a single task within a group.
+	// If GroupMaxSize is reached, the server will aggregate the tasks into one immediately.
+	//
+	// If unset or zero, no size limit is used.
+	GroupMaxSize int
+
+	// GroupAggregator specifies the aggregation function used to aggregate multiple tasks in a group into one task.
+	//
+	// If unset or nil, the group aggregation feature will be disabled on the server.
+	GroupAggregator GroupAggregator
+
+	// JanitorInterval specifies the average interval of janitor checks for expired completed tasks.
+	//
+	// If unset or zero, default interval of 8 seconds is used.
+	JanitorInterval time.Duration
+
+	// JanitorBatchSize specifies the number of expired completed tasks to be deleted in one run.
+	//
+	// If unset or zero, default batch size of 100 is used.
+	// Make sure to not put a big number as the batch size to prevent a long-running script.
+	JanitorBatchSize int
 }
 
-// An ErrorHandler handles an error occured during task processing.
+// GroupAggregator aggregates a group of tasks into one before the tasks are passed to the Handler.
+type GroupAggregator interface {
+	// Aggregate aggregates the given tasks in a group with the given group name,
+	// and returns a new task which is the aggregation of those tasks.
+	//
+	// Use NewTask(typename, payload, opts...) to set any options for the aggregated task.
+	// The Queue option, if provided, will be ignored and the aggregated task will always be enqueued
+	// to the same queue the group belonged.
+	Aggregate(group string, tasks []*Task) *Task
+}
+
+// The GroupAggregatorFunc type is an adapter to allow the use of  ordinary functions as a GroupAggregator.
+// If f is a function with the appropriate signature, GroupAggregatorFunc(f) is a GroupAggregator that calls f.
+type GroupAggregatorFunc func(group string, tasks []*Task) *Task
+
+// Aggregate calls fn(group, tasks)
+func (fn GroupAggregatorFunc) Aggregate(group string, tasks []*Task) *Task {
+	return fn(group, tasks)
+}
+
+// An ErrorHandler handles an error occurred during task processing.
 type ErrorHandler interface {
 	HandleError(ctx context.Context, task *Task, err error)
 }
@@ -262,37 +400,71 @@ func toInternalLogLevel(l LogLevel) log.Level {
 // DefaultRetryDelayFunc is the default RetryDelayFunc used if one is not specified in Config.
 // It uses exponential back-off strategy to calculate the retry delay.
 func DefaultRetryDelayFunc(n int, e error, t *Task) time.Duration {
-	r := rand.New(rand.NewSource(time.Now().UnixNano()))
 	// Formula taken from https://github.com/mperham/sidekiq.
-	s := int(math.Pow(float64(n), 4)) + 15 + (r.Intn(30) * (n + 1))
+	s := int(math.Pow(float64(n), 4)) + 15 + (rand.IntN(30) * (n + 1))
 	return time.Duration(s) * time.Second
 }
 
+func defaultIsFailureFunc(err error) bool { return err != nil }
+
 var defaultQueueConfig = map[string]int{
 	base.DefaultQueueName: 1,
 }
 
 const (
+	defaultTaskCheckInterval = 1 * time.Second
+
 	defaultShutdownTimeout = 8 * time.Second
 
 	defaultHealthCheckInterval = 15 * time.Second
+
+	defaultDelayedTaskCheckInterval = 5 * time.Second
+
+	defaultGroupGracePeriod = 1 * time.Minute
+
+	defaultJanitorInterval = 8 * time.Second
+
+	defaultJanitorBatchSize = 100
 )
 
 // NewServer returns a new Server given a redis connection option
 // and server configuration.
 func NewServer(r RedisConnOpt, cfg Config) *Server {
-	c, ok := r.MakeRedisClient().(redis.UniversalClient)
+	redisClient, ok := r.MakeRedisClient().(redis.UniversalClient)
 	if !ok {
 		panic(fmt.Sprintf("asynq: unsupported RedisConnOpt type %T", r))
 	}
+	server := NewServerFromRedisClient(redisClient, cfg)
+	server.sharedConnection = false
+	return server
+}
+
+// NewServerFromRedisClient returns a new instance of Server given a redis.UniversalClient
+// and server configuration
+// Warning: The underlying redis connection pool will not be closed by Asynq, you are responsible for closing it.
+func NewServerFromRedisClient(c redis.UniversalClient, cfg Config) *Server {
+	baseCtxFn := cfg.BaseContext
+	if baseCtxFn == nil {
+		baseCtxFn = context.Background
+	}
 	n := cfg.Concurrency
 	if n < 1 {
 		n = runtime.NumCPU()
 	}
+
+	taskCheckInterval := cfg.TaskCheckInterval
+	if taskCheckInterval <= 0 {
+		taskCheckInterval = defaultTaskCheckInterval
+	}
+
 	delayFunc := cfg.RetryDelayFunc
 	if delayFunc == nil {
 		delayFunc = DefaultRetryDelayFunc
 	}
+	isFailureFunc := cfg.IsFailure
+	if isFailureFunc == nil {
+		isFailureFunc = defaultIsFailureFunc
+	}
 	queues := make(map[string]int)
 	for qname, p := range cfg.Queues {
 		if err := base.ValidateQueueName(qname); err != nil {
@@ -317,6 +489,14 @@ func NewServer(r RedisConnOpt, cfg Config) *Server {
 	if healthcheckInterval == 0 {
 		healthcheckInterval = defaultHealthCheckInterval
 	}
+	// TODO: Create a helper to check for zero value and fall back to default (e.g. getDurationOrDefault())
+	groupGracePeriod := cfg.GroupGracePeriod
+	if groupGracePeriod == 0 {
+		groupGracePeriod = defaultGroupGracePeriod
+	}
+	if groupGracePeriod < time.Second {
+		panic("GroupGracePeriod cannot be less than a second")
+	}
 	logger := log.NewLogger(cfg.Logger)
 	loglevel := cfg.LogLevel
 	if loglevel == level_unspecified {
@@ -328,7 +508,7 @@ func NewServer(r RedisConnOpt, cfg Config) *Server {
 	starting := make(chan *workerInfo)
 	finished := make(chan *base.TaskMessage)
 	syncCh := make(chan *syncRequest)
-	state := base.NewServerState()
+	srvState := &serverState{value: srvStateNew}
 	cancels := base.NewCancelations()
 
 	syncer := newSyncer(syncerParams{
@@ -343,15 +523,19 @@ func NewServer(r RedisConnOpt, cfg Config) *Server {
 		concurrency:    n,
 		queues:         queues,
 		strictPriority: cfg.StrictPriority,
-		state:          state,
+		state:          srvState,
 		starting:       starting,
 		finished:       finished,
 	})
+	delayedTaskCheckInterval := cfg.DelayedTaskCheckInterval
+	if delayedTaskCheckInterval == 0 {
+		delayedTaskCheckInterval = defaultDelayedTaskCheckInterval
+	}
 	forwarder := newForwarder(forwarderParams{
 		logger:   logger,
 		broker:   rdb,
 		queues:   qnames,
-		interval: 5 * time.Second,
+		interval: delayedTaskCheckInterval,
 	})
 	subscriber := newSubscriber(subscriberParams{
 		logger:       logger,
@@ -359,23 +543,27 @@ func NewServer(r RedisConnOpt, cfg Config) *Server {
 		cancelations: cancels,
 	})
 	processor := newProcessor(processorParams{
-		logger:          logger,
-		broker:          rdb,
-		retryDelayFunc:  delayFunc,
-		syncCh:          syncCh,
-		cancelations:    cancels,
-		concurrency:     n,
-		queues:          queues,
-		strictPriority:  cfg.StrictPriority,
-		errHandler:      cfg.ErrorHandler,
-		shutdownTimeout: shutdownTimeout,
-		starting:        starting,
-		finished:        finished,
+		logger:            logger,
+		broker:            rdb,
+		retryDelayFunc:    delayFunc,
+		taskCheckInterval: taskCheckInterval,
+		baseCtxFn:         baseCtxFn,
+		isFailureFunc:     isFailureFunc,
+		syncCh:            syncCh,
+		cancelations:      cancels,
+		concurrency:       n,
+		queues:            queues,
+		strictPriority:    cfg.StrictPriority,
+		errHandler:        cfg.ErrorHandler,
+		shutdownTimeout:   shutdownTimeout,
+		starting:          starting,
+		finished:          finished,
 	})
 	recoverer := newRecoverer(recovererParams{
 		logger:         logger,
 		broker:         rdb,
 		retryDelayFunc: delayFunc,
+		isFailureFunc:  isFailureFunc,
 		queues:         qnames,
 		interval:       1 * time.Minute,
 	})
@@ -385,17 +573,50 @@ func NewServer(r RedisConnOpt, cfg Config) *Server {
 		interval:        healthcheckInterval,
 		healthcheckFunc: cfg.HealthCheckFunc,
 	})
+
+	janitorInterval := cfg.JanitorInterval
+	if janitorInterval == 0 {
+		janitorInterval = defaultJanitorInterval
+	}
+
+	janitorBatchSize := cfg.JanitorBatchSize
+	if janitorBatchSize == 0 {
+		janitorBatchSize = defaultJanitorBatchSize
+	}
+	if janitorBatchSize > defaultJanitorBatchSize {
+		logger.Warnf("Janitor batch size of %d is greater than the recommended batch size of %d. "+
+			"This might cause a long-running script", janitorBatchSize, defaultJanitorBatchSize)
+	}
+	janitor := newJanitor(janitorParams{
+		logger:    logger,
+		broker:    rdb,
+		queues:    qnames,
+		interval:  janitorInterval,
+		batchSize: janitorBatchSize,
+	})
+	aggregator := newAggregator(aggregatorParams{
+		logger:          logger,
+		broker:          rdb,
+		queues:          qnames,
+		gracePeriod:     groupGracePeriod,
+		maxDelay:        cfg.GroupMaxDelay,
+		maxSize:         cfg.GroupMaxSize,
+		groupAggregator: cfg.GroupAggregator,
+	})
 	return &Server{
-		logger:        logger,
-		broker:        rdb,
-		state:         state,
-		forwarder:     forwarder,
-		processor:     processor,
-		syncer:        syncer,
-		heartbeater:   heartbeater,
-		subscriber:    subscriber,
-		recoverer:     recoverer,
-		healthchecker: healthchecker,
+		logger:           logger,
+		broker:           rdb,
+		sharedConnection: true,
+		state:            srvState,
+		forwarder:        forwarder,
+		processor:        processor,
+		syncer:           syncer,
+		heartbeater:      heartbeater,
+		subscriber:       subscriber,
+		recoverer:        recoverer,
+		healthchecker:    healthchecker,
+		janitor:          janitor,
+		aggregator:       aggregator,
 	}
 }
 
@@ -411,6 +632,10 @@ func NewServer(r RedisConnOpt, cfg Config) *Server {
 // One exception to this rule is when ProcessTask returns a SkipRetry error.
 // If the returned error is SkipRetry or an error wraps SkipRetry, retry is
 // skipped and the task will be immediately archived instead.
+//
+// Another exception to this rule is when ProcessTask returns a RevokeTask error.
+// If the returned error is RevokeTask or an error wraps RevokeTask, the task
+// will not be retried or archived.
 type Handler interface {
 	ProcessTask(context.Context, *Task) error
 }
@@ -457,17 +682,11 @@ func (srv *Server) Start(handler Handler) error {
 	if handler == nil {
 		return fmt.Errorf("asynq: server cannot run with nil handler")
 	}
-	switch srv.state.Get() {
-	case base.StateActive:
-		return fmt.Errorf("asynq: the server is already running")
-	case base.StateStopped:
-		return fmt.Errorf("asynq: the server is in the stopped state. Waiting for shutdown.")
-	case base.StateClosed:
-		return ErrServerClosed
-	}
-	srv.state.Set(base.StateActive)
 	srv.processor.handler = handler
 
+	if err := srv.start(); err != nil {
+		return err
+	}
 	srv.logger.Info("Starting processing")
 
 	srv.heartbeater.start(&srv.wg)
@@ -477,6 +696,25 @@ func (srv *Server) Start(handler Handler) error {
 	srv.recoverer.start(&srv.wg)
 	srv.forwarder.start(&srv.wg)
 	srv.processor.start(&srv.wg)
+	srv.janitor.start(&srv.wg)
+	srv.aggregator.start(&srv.wg)
+	return nil
+}
+
+// Checks server state and returns an error if pre-condition is not met.
+// Otherwise it sets the server state to active.
+func (srv *Server) start() error {
+	srv.state.mu.Lock()
+	defer srv.state.mu.Unlock()
+	switch srv.state.value {
+	case srvStateActive:
+		return fmt.Errorf("asynq: the server is already running")
+	case srvStateStopped:
+		return fmt.Errorf("asynq: the server is in the stopped state. Waiting for shutdown.")
+	case srvStateClosed:
+		return ErrServerClosed
+	}
+	srv.state.value = srvStateActive
 	return nil
 }
 
@@ -485,11 +723,14 @@ func (srv *Server) Start(handler Handler) error {
 // active workers to finish processing tasks for duration specified in Config.ShutdownTimeout.
 // If worker didn't finish processing a task during the timeout, the task will be pushed back to Redis.
 func (srv *Server) Shutdown() {
-	switch srv.state.Get() {
-	case base.StateNew, base.StateClosed:
+	srv.state.mu.Lock()
+	if srv.state.value == srvStateNew || srv.state.value == srvStateClosed {
+		srv.state.mu.Unlock()
 		// server is not running, do nothing and return.
 		return
 	}
+	srv.state.value = srvStateClosed
+	srv.state.mu.Unlock()
 
 	srv.logger.Info("Starting graceful shutdown")
 	// Note: The order of shutdown is important.
@@ -501,14 +742,15 @@ func (srv *Server) Shutdown() {
 	srv.recoverer.shutdown()
 	srv.syncer.shutdown()
 	srv.subscriber.shutdown()
+	srv.janitor.shutdown()
+	srv.aggregator.shutdown()
 	srv.healthchecker.shutdown()
 	srv.heartbeater.shutdown()
-
 	srv.wg.Wait()
 
-	srv.broker.Close()
-	srv.state.Set(base.StateClosed)
-
+	if !srv.sharedConnection {
+		srv.broker.Close()
+	}
 	srv.logger.Info("Exiting")
 }
 
@@ -518,8 +760,29 @@ func (srv *Server) Shutdown() {
 //
 // Stop does not shutdown the server, make sure to call Shutdown before exit.
 func (srv *Server) Stop() {
+	srv.state.mu.Lock()
+	if srv.state.value != srvStateActive {
+		// Invalid call to Stop, server can only go from Active state to Stopped state.
+		srv.state.mu.Unlock()
+		return
+	}
+	srv.state.value = srvStateStopped
+	srv.state.mu.Unlock()
+
 	srv.logger.Info("Stopping processor")
 	srv.processor.stop()
-	srv.state.Set(base.StateStopped)
 	srv.logger.Info("Processor stopped")
 }
+
+// Ping performs a ping against the redis connection.
+//
+// This is an alternative to the HealthCheckFunc available in the Config object.
+func (srv *Server) Ping() error {
+	srv.state.mu.Lock()
+	defer srv.state.mu.Unlock()
+	if srv.state.value == srvStateClosed {
+		return nil
+	}
+
+	return srv.broker.Ping()
+}

server_test.go

@@ -11,25 +11,15 @@ import (
 	"testing"
 	"time"
 
-	"github.com/hibiken/asynq/internal/asynqtest"
 	"github.com/hibiken/asynq/internal/rdb"
 	"github.com/hibiken/asynq/internal/testbroker"
+	"github.com/hibiken/asynq/internal/testutil"
+
+	"github.com/redis/go-redis/v9"
 	"go.uber.org/goleak"
 )
 
-func TestServer(t *testing.T) {
-	// https://github.com/go-redis/redis/issues/1029
-	ignoreOpt := goleak.IgnoreTopFunction("github.com/go-redis/redis/v7/internal/pool.(*ConnPool).reaper")
-	defer goleak.VerifyNoLeaks(t, ignoreOpt)
-
-	redisConnOpt := getRedisConnOpt(t)
-	c := NewClient(redisConnOpt)
-	defer c.Close()
-	srv := NewServer(redisConnOpt, Config{
-		Concurrency: 10,
-		LogLevel:    testLogLevel,
-	})
-
+func testServer(t *testing.T, c *Client, srv *Server) {
 	// no-op handler
 	h := func(ctx context.Context, task *Task) error {
 		return nil
@@ -40,12 +30,12 @@ func TestServer(t *testing.T) {
 		t.Fatal(err)
 	}
 
-	_, err = c.Enqueue(NewTask("send_email", asynqtest.JSON(map[string]interface{}{"recipient_id": 123})))
+	_, err = c.Enqueue(NewTask("send_email", testutil.JSON(map[string]interface{}{"recipient_id": 123})))
 	if err != nil {
 		t.Errorf("could not enqueue a task: %v", err)
 	}
 
-	_, err = c.Enqueue(NewTask("send_email", asynqtest.JSON(map[string]interface{}{"recipient_id": 456})), ProcessIn(1*time.Hour))
+	_, err = c.Enqueue(NewTask("send_email", testutil.JSON(map[string]interface{}{"recipient_id": 456})), ProcessIn(1*time.Hour))
 	if err != nil {
 		t.Errorf("could not enqueue a task: %v", err)
 	}
@@ -53,18 +43,55 @@ func TestServer(t *testing.T) {
 	srv.Shutdown()
 }
 
+func TestServer(t *testing.T) {
+	// https://github.com/go-redis/redis/issues/1029
+	ignoreOpt := goleak.IgnoreTopFunction("github.com/redis/go-redis/v9/internal/pool.(*ConnPool).reaper")
+	defer goleak.VerifyNone(t, ignoreOpt)
+
+	redisConnOpt := getRedisConnOpt(t)
+	c := NewClient(redisConnOpt)
+	defer c.Close()
+	srv := NewServer(redisConnOpt, Config{
+		Concurrency: 10,
+		LogLevel:    testLogLevel,
+	})
+
+	testServer(t, c, srv)
+}
+
+func TestServerFromRedisClient(t *testing.T) {
+	// https://github.com/go-redis/redis/issues/1029
+	ignoreOpt := goleak.IgnoreTopFunction("github.com/redis/go-redis/v9/internal/pool.(*ConnPool).reaper")
+	defer goleak.VerifyNone(t, ignoreOpt)
+
+	redisConnOpt := getRedisConnOpt(t)
+	redisClient := redisConnOpt.MakeRedisClient().(redis.UniversalClient)
+	c := NewClientFromRedisClient(redisClient)
+	srv := NewServerFromRedisClient(redisClient, Config{
+		Concurrency: 10,
+		LogLevel:    testLogLevel,
+	})
+
+	testServer(t, c, srv)
+
+	err := c.Close()
+	if err == nil {
+		t.Error("client.Close() should have failed because of a shared client but it didn't")
+	}
+}
+
 func TestServerRun(t *testing.T) {
 	// https://github.com/go-redis/redis/issues/1029
-	ignoreOpt := goleak.IgnoreTopFunction("github.com/go-redis/redis/v7/internal/pool.(*ConnPool).reaper")
-	defer goleak.VerifyNoLeaks(t, ignoreOpt)
+	ignoreOpt := goleak.IgnoreTopFunction("github.com/redis/go-redis/v9/internal/pool.(*ConnPool).reaper")
+	defer goleak.VerifyNone(t, ignoreOpt)
 
-	srv := NewServer(RedisClientOpt{Addr: ":6379"}, Config{LogLevel: testLogLevel})
+	srv := NewServer(getRedisConnOpt(t), Config{LogLevel: testLogLevel})
 
 	done := make(chan struct{})
 	// Make sure server exits when receiving TERM signal.
 	go func() {
 		time.Sleep(2 * time.Second)
-		syscall.Kill(syscall.Getpid(), syscall.SIGTERM)
+		_ = syscall.Kill(syscall.Getpid(), syscall.SIGTERM)
 		done <- struct{}{}
 	}()
 
@@ -83,7 +110,7 @@ func TestServerRun(t *testing.T) {
 }
 
 func TestServerErrServerClosed(t *testing.T) {
-	srv := NewServer(RedisClientOpt{Addr: ":6379"}, Config{LogLevel: testLogLevel})
+	srv := NewServer(getRedisConnOpt(t), Config{LogLevel: testLogLevel})
 	handler := NewServeMux()
 	if err := srv.Start(handler); err != nil {
 		t.Fatal(err)
@@ -96,7 +123,7 @@ func TestServerErrServerClosed(t *testing.T) {
 }
 
 func TestServerErrNilHandler(t *testing.T) {
-	srv := NewServer(RedisClientOpt{Addr: ":6379"}, Config{LogLevel: testLogLevel})
+	srv := NewServer(getRedisConnOpt(t), Config{LogLevel: testLogLevel})
 	err := srv.Start(nil)
 	if err == nil {
 		t.Error("Starting server with nil handler: (*Server).Start(nil) did not return error")
@@ -105,7 +132,7 @@ func TestServerErrNilHandler(t *testing.T) {
 }
 
 func TestServerErrServerRunning(t *testing.T) {
-	srv := NewServer(RedisClientOpt{Addr: ":6379"}, Config{LogLevel: testLogLevel})
+	srv := NewServer(getRedisConnOpt(t), Config{LogLevel: testLogLevel})
 	handler := NewServeMux()
 	if err := srv.Start(handler); err != nil {
 		t.Fatal(err)
@@ -126,7 +153,7 @@ func TestServerWithRedisDown(t *testing.T) {
 	}()
 	r := rdb.NewRDB(setup(t))
 	testBroker := testbroker.NewTestBroker(r)
-	srv := NewServer(RedisClientOpt{Addr: ":6379"}, Config{LogLevel: testLogLevel})
+	srv := NewServer(getRedisConnOpt(t), Config{LogLevel: testLogLevel})
 	srv.broker = testBroker
 	srv.forwarder.broker = testBroker
 	srv.heartbeater.broker = testBroker

signals_unix.go

@@ -1,4 +1,4 @@
-// +build linux bsd darwin
+//go:build linux || dragonfly || freebsd || netbsd || openbsd || darwin
 
 package asynq
 
@@ -24,8 +24,10 @@ func (srv *Server) waitForSignals() {
 		if sig == unix.SIGTSTP {
 			srv.Stop()
 			continue
+		} else {
+			srv.Stop()
+			break
 		}
-		break
 	}
 }
 

signals_windows.go

@@ -1,4 +1,4 @@
-// +build windows
+//go:build windows
 
 package asynq
 

subscriber.go

@@ -8,7 +8,7 @@ import (
 	"sync"
 	"time"
 
-	"github.com/go-redis/redis/v7"
+	"github.com/redis/go-redis/v9"
 	"github.com/hibiken/asynq/internal/base"
 	"github.com/hibiken/asynq/internal/log"
 )

syncer_test.go

@@ -5,14 +5,15 @@
 package asynq
 
 import (
+	"context"
 	"fmt"
 	"sync"
 	"testing"
 	"time"
 
-	h "github.com/hibiken/asynq/internal/asynqtest"
 	"github.com/hibiken/asynq/internal/base"
 	"github.com/hibiken/asynq/internal/rdb"
+	h "github.com/hibiken/asynq/internal/testutil"
 )
 
 func TestSyncer(t *testing.T) {
@@ -41,7 +42,7 @@ func TestSyncer(t *testing.T) {
 		m := msg
 		syncRequestCh <- &syncRequest{
 			fn: func() error {
-				return rdbClient.Done(m)
+				return rdbClient.Done(context.Background(), m)
 			},
 			deadline: time.Now().Add(5 * time.Minute),
 		}

tools/asynq/README.md

@@ -12,7 +12,7 @@ Asynq CLI is a command line tool to monitor the queues and tasks managed by `asy
 
 In order to use the tool, compile it using the following command:
 
-    go get github.com/hibiken/asynq/tools/asynq
+    go install github.com/hibiken/asynq/tools/asynq@latest
 
 This will create the asynq executable under your `$GOPATH/bin` directory.
 
@@ -22,9 +22,10 @@ This will create the asynq executable under your `$GOPATH/bin` directory.
 
 To view details on any command, use `asynq help <command> <subcommand>`.
 
+- `asynq dash`
 - `asynq stats`
 - `asynq queue [ls inspect history rm pause unpause]`
-- `asynq task [ls cancel delete archive run delete-all archive-all run-all]`
+- `asynq task [ls cancel delete archive run deleteall archiveall runall]`
 - `asynq server [ls]`
 
 ### Global flags

tools/asynq/cmd/cron.go

@@ -11,6 +11,7 @@ import (
 	"sort"
 	"time"
 
+	"github.com/MakeNowJust/heredoc/v2"
 	"github.com/hibiken/asynq"
 	"github.com/spf13/cobra"
 )
@@ -24,21 +25,30 @@ func init() {
 }
 
 var cronCmd = &cobra.Command{
-	Use:   "cron",
+	Use:   "cron <command> [flags]",
 	Short: "Manage cron",
+	Example: heredoc.Doc(`
+		$ asynq cron ls
+		$ asynq cron history 7837f142-6337-4217-9276-8f27281b67d1`),
 }
 
 var cronListCmd = &cobra.Command{
-	Use:   "ls",
-	Short: "List cron entries",
-	Run:   cronList,
+	Use:     "list",
+	Aliases: []string{"ls"},
+	Short:   "List cron entries",
+	Run:     cronList,
 }
 
 var cronHistoryCmd = &cobra.Command{
-	Use:   "history [ENTRY_ID...]",
+	Use:   "history <entry_id> [<entry_id>...]",
 	Short: "Show history of each cron tasks",
 	Args:  cobra.MinimumNArgs(1),
 	Run:   cronHistory,
+	Example: heredoc.Doc(`
+		$ asynq cron history 7837f142-6337-4217-9276-8f27281b67d1
+		$ asynq cron history 7837f142-6337-4217-9276-8f27281b67d1 bf6a8594-cd03-4968-b36a-8572c5e160dd
+		$ asynq cron history 7837f142-6337-4217-9276-8f27281b67d1 --size=100
+		$ asynq cron history 7837f142-6337-4217-9276-8f27281b67d1 --page=2`),
 }
 
 func cronList(cmd *cobra.Command, args []string) {
@@ -63,7 +73,7 @@ func cronList(cmd *cobra.Command, args []string) {
 	cols := []string{"EntryID", "Spec", "Type", "Payload", "Options", "Next", "Prev"}
 	printRows := func(w io.Writer, tmpl string) {
 		for _, e := range entries {
-			fmt.Fprintf(w, tmpl, e.ID, e.Spec, e.Task.Type(), formatPayload(e.Task.Payload()), e.Opts,
+			fmt.Fprintf(w, tmpl, e.ID, e.Spec, e.Task.Type(), sprintBytes(e.Task.Payload()), e.Opts,
 				nextEnqueue(e.Next), prevEnqueue(e.Prev))
 		}
 	}

tools/asynq/cmd/dash.go

@@ -0,0 +1,45 @@
+// Copyright 2022 Kentaro Hibino. All rights reserved.
+// Use of this source code is governed by a MIT license
+// that can be found in the LICENSE file.
+
+package cmd
+
+import (
+	"fmt"
+	"os"
+	"time"
+
+	"github.com/MakeNowJust/heredoc/v2"
+	"github.com/hibiken/asynq/tools/asynq/cmd/dash"
+	"github.com/spf13/cobra"
+)
+
+var (
+	flagPollInterval = 8 * time.Second
+)
+
+func init() {
+	rootCmd.AddCommand(dashCmd)
+	dashCmd.Flags().DurationVar(&flagPollInterval, "refresh", 8*time.Second, "Interval between data refresh (default: 8s, min allowed: 1s)")
+}
+
+var dashCmd = &cobra.Command{
+	Use:   "dash",
+	Short: "View dashboard",
+	Long: heredoc.Doc(`
+		Display interactive dashboard.`),
+	Args: cobra.NoArgs,
+	Example: heredoc.Doc(`
+        $ asynq dash
+        $ asynq dash --refresh=3s`),
+	Run: func(cmd *cobra.Command, args []string) {
+		if flagPollInterval < 1*time.Second {
+			fmt.Println("error: --refresh cannot be less than 1s")
+			os.Exit(1)
+		}
+		dash.Run(dash.Options{
+			PollInterval: flagPollInterval,
+			RedisConnOpt: getRedisConnOpt(),
+		})
+	},
+}

tools/asynq/cmd/dash/dash.go

@@ -0,0 +1,220 @@
+// Copyright 2022 Kentaro Hibino. All rights reserved.
+// Use of this source code is governed by a MIT license
+// that can be found in the LICENSE file.
+
+package dash
+
+import (
+	"errors"
+	"fmt"
+	"os"
+	"strings"
+	"time"
+
+	"github.com/gdamore/tcell/v2"
+	"github.com/hibiken/asynq"
+)
+
+// viewType is an enum for dashboard views.
+type viewType int
+
+const (
+	viewTypeQueues viewType = iota
+	viewTypeQueueDetails
+	viewTypeHelp
+)
+
+// State holds dashboard state.
+type State struct {
+	queues []*asynq.QueueInfo
+	tasks  []*asynq.TaskInfo
+	groups []*asynq.GroupInfo
+	err    error
+
+	// Note: index zero corresponds to the table header; index=1 correctponds to the first element
+	queueTableRowIdx int             // highlighted row in queue table
+	taskTableRowIdx  int             // highlighted row in task table
+	groupTableRowIdx int             // highlighted row in group table
+	taskState        asynq.TaskState // highlighted task state in queue details view
+	taskID           string          // selected task ID
+
+	selectedQueue *asynq.QueueInfo // queue shown on queue details view
+	selectedGroup *asynq.GroupInfo
+	selectedTask  *asynq.TaskInfo
+
+	pageNum int // pagination page number
+
+	view     viewType // current view type
+	prevView viewType // to support "go back"
+}
+
+func (s *State) DebugString() string {
+	var b strings.Builder
+	b.WriteString(fmt.Sprintf("len(queues)=%d ", len(s.queues)))
+	b.WriteString(fmt.Sprintf("len(tasks)=%d ", len(s.tasks)))
+	b.WriteString(fmt.Sprintf("len(groups)=%d ", len(s.groups)))
+	b.WriteString(fmt.Sprintf("err=%v ", s.err))
+
+	if s.taskState != 0 {
+		b.WriteString(fmt.Sprintf("taskState=%s ", s.taskState.String()))
+	} else {
+		b.WriteString(fmt.Sprintf("taskState=0"))
+	}
+	b.WriteString(fmt.Sprintf("taskID=%s ", s.taskID))
+
+	b.WriteString(fmt.Sprintf("queueTableRowIdx=%d ", s.queueTableRowIdx))
+	b.WriteString(fmt.Sprintf("taskTableRowIdx=%d ", s.taskTableRowIdx))
+	b.WriteString(fmt.Sprintf("groupTableRowIdx=%d ", s.groupTableRowIdx))
+
+	if s.selectedQueue != nil {
+		b.WriteString(fmt.Sprintf("selectedQueue={Queue:%s} ", s.selectedQueue.Queue))
+	} else {
+		b.WriteString("selectedQueue=nil ")
+	}
+
+	if s.selectedGroup != nil {
+		b.WriteString(fmt.Sprintf("selectedGroup={Group:%s} ", s.selectedGroup.Group))
+	} else {
+		b.WriteString("selectedGroup=nil ")
+	}
+
+	if s.selectedTask != nil {
+		b.WriteString(fmt.Sprintf("selectedTask={ID:%s} ", s.selectedTask.ID))
+	} else {
+		b.WriteString("selectedTask=nil ")
+	}
+
+	b.WriteString(fmt.Sprintf("pageNum=%d", s.pageNum))
+	return b.String()
+}
+
+type Options struct {
+	DebugMode    bool
+	PollInterval time.Duration
+	RedisConnOpt asynq.RedisConnOpt
+}
+
+func Run(opts Options) {
+	s, err := tcell.NewScreen()
+	if err != nil {
+		fmt.Printf("failed to create a screen: %v\n", err)
+		os.Exit(1)
+	}
+	if err := s.Init(); err != nil {
+		fmt.Printf("failed to initialize screen: %v\n", err)
+		os.Exit(1)
+	}
+	s.SetStyle(baseStyle) // set default text style
+
+	var (
+		state = State{} // confined in this goroutine only; DO NOT SHARE
+
+		inspector = asynq.NewInspector(opts.RedisConnOpt)
+		ticker    = time.NewTicker(opts.PollInterval)
+
+		eventCh = make(chan tcell.Event)
+		done    = make(chan struct{})
+
+		// channels to send/receive data fetched asynchronously
+		errorCh  = make(chan error)
+		queueCh  = make(chan *asynq.QueueInfo)
+		taskCh   = make(chan *asynq.TaskInfo)
+		queuesCh = make(chan []*asynq.QueueInfo)
+		groupsCh = make(chan []*asynq.GroupInfo)
+		tasksCh  = make(chan []*asynq.TaskInfo)
+	)
+	defer ticker.Stop()
+
+	f := dataFetcher{
+		inspector,
+		opts,
+		s,
+		errorCh,
+		queueCh,
+		taskCh,
+		queuesCh,
+		groupsCh,
+		tasksCh,
+	}
+
+	d := dashDrawer{
+		s,
+		opts,
+	}
+
+	h := keyEventHandler{
+		s:            s,
+		fetcher:      &f,
+		drawer:       &d,
+		state:        &state,
+		done:         done,
+		ticker:       ticker,
+		pollInterval: opts.PollInterval,
+	}
+
+	go fetchQueues(inspector, queuesCh, errorCh, opts)
+	go s.ChannelEvents(eventCh, done) // TODO: Double check that we are not leaking goroutine with this one.
+	d.Draw(&state)                    // draw initial screen
+
+	for {
+		// Update screen
+		s.Show()
+
+		select {
+		case ev := <-eventCh:
+			// Process event
+			switch ev := ev.(type) {
+			case *tcell.EventResize:
+				s.Sync()
+			case *tcell.EventKey:
+				h.HandleKeyEvent(ev)
+			}
+
+		case <-ticker.C:
+			f.Fetch(&state)
+
+		case queues := <-queuesCh:
+			state.queues = queues
+			state.err = nil
+			if len(queues) < state.queueTableRowIdx {
+				state.queueTableRowIdx = len(queues)
+			}
+			d.Draw(&state)
+
+		case q := <-queueCh:
+			state.selectedQueue = q
+			state.err = nil
+			d.Draw(&state)
+
+		case groups := <-groupsCh:
+			state.groups = groups
+			state.err = nil
+			if len(groups) < state.groupTableRowIdx {
+				state.groupTableRowIdx = len(groups)
+			}
+			d.Draw(&state)
+
+		case tasks := <-tasksCh:
+			state.tasks = tasks
+			state.err = nil
+			if len(tasks) < state.taskTableRowIdx {
+				state.taskTableRowIdx = len(tasks)
+			}
+			d.Draw(&state)
+
+		case t := <-taskCh:
+			state.selectedTask = t
+			state.err = nil
+			d.Draw(&state)
+
+		case err := <-errorCh:
+			if errors.Is(err, asynq.ErrTaskNotFound) {
+				state.selectedTask = nil
+			} else {
+				state.err = err
+			}
+			d.Draw(&state)
+		}
+	}
+
+}

tools/asynq/cmd/dash/draw.go

@@ -0,0 +1,724 @@
+// Copyright 2022 Kentaro Hibino. All rights reserved.
+// Use of this source code is governed by a MIT license
+// that can be found in the LICENSE file.
+
+package dash
+
+import (
+	"fmt"
+	"math"
+	"strconv"
+	"strings"
+	"time"
+	"unicode"
+	"unicode/utf8"
+
+	"github.com/gdamore/tcell/v2"
+	"github.com/hibiken/asynq"
+	"github.com/mattn/go-runewidth"
+)
+
+var (
+	baseStyle  = tcell.StyleDefault.Background(tcell.ColorReset).Foreground(tcell.ColorReset)
+	labelStyle = baseStyle.Foreground(tcell.ColorLightGray)
+
+	// styles for bar graph
+	activeStyle      = baseStyle.Foreground(tcell.ColorBlue)
+	pendingStyle     = baseStyle.Foreground(tcell.ColorGreen)
+	aggregatingStyle = baseStyle.Foreground(tcell.ColorLightGreen)
+	scheduledStyle   = baseStyle.Foreground(tcell.ColorYellow)
+	retryStyle       = baseStyle.Foreground(tcell.ColorPink)
+	archivedStyle    = baseStyle.Foreground(tcell.ColorPurple)
+	completedStyle   = baseStyle.Foreground(tcell.ColorDarkGreen)
+)
+
+// drawer draws UI with the given state.
+type drawer interface {
+	Draw(state *State)
+}
+
+type dashDrawer struct {
+	s    tcell.Screen
+	opts Options
+}
+
+func (dd *dashDrawer) Draw(state *State) {
+	s, opts := dd.s, dd.opts
+	s.Clear()
+	// Simulate data update on every render
+	d := NewScreenDrawer(s)
+	switch state.view {
+	case viewTypeQueues:
+		d.Println("=== Queues ===", baseStyle.Bold(true))
+		d.NL()
+		drawQueueSizeGraphs(d, state)
+		d.NL()
+		drawQueueTable(d, baseStyle, state)
+	case viewTypeQueueDetails:
+		d.Println("=== Queue Summary ===", baseStyle.Bold(true))
+		d.NL()
+		drawQueueSummary(d, state)
+		d.NL()
+		d.NL()
+		d.Println("=== Tasks ===", baseStyle.Bold(true))
+		d.NL()
+		drawTaskStateBreakdown(d, baseStyle, state)
+		d.NL()
+		drawTaskTable(d, state)
+		drawTaskModal(d, state)
+	case viewTypeHelp:
+		drawHelp(d)
+	}
+	d.GoToBottom()
+	if opts.DebugMode {
+		drawDebugInfo(d, state)
+	} else {
+		drawFooter(d, state)
+	}
+}
+
+func drawQueueSizeGraphs(d *ScreenDrawer, state *State) {
+	var qnames []string
+	var qsizes []string // queue size in strings
+	maxSize := 1        // not zero to avoid division by zero
+	for _, q := range state.queues {
+		qnames = append(qnames, q.Queue)
+		qsizes = append(qsizes, strconv.Itoa(q.Size))
+		if q.Size > maxSize {
+			maxSize = q.Size
+		}
+	}
+	qnameWidth := maxwidth(qnames)
+	qsizeWidth := maxwidth(qsizes)
+
+	// Calculate the multipler to scale the graph
+	screenWidth, _ := d.Screen().Size()
+	graphMaxWidth := screenWidth - (qnameWidth + qsizeWidth + 3) // <qname> |<graph> <size>
+	multipiler := 1.0
+	if graphMaxWidth < maxSize {
+		multipiler = float64(graphMaxWidth) / float64(maxSize)
+	}
+
+	const tick = '▇'
+	for _, q := range state.queues {
+		d.Print(q.Queue, baseStyle)
+		d.Print(strings.Repeat(" ", qnameWidth-runewidth.StringWidth(q.Queue)+1), baseStyle) // padding between qname and graph
+		d.Print("|", baseStyle)
+		d.Print(strings.Repeat(string(tick), int(math.Floor(float64(q.Active)*multipiler))), activeStyle)
+		d.Print(strings.Repeat(string(tick), int(math.Floor(float64(q.Pending)*multipiler))), pendingStyle)
+		d.Print(strings.Repeat(string(tick), int(math.Floor(float64(q.Aggregating)*multipiler))), aggregatingStyle)
+		d.Print(strings.Repeat(string(tick), int(math.Floor(float64(q.Scheduled)*multipiler))), scheduledStyle)
+		d.Print(strings.Repeat(string(tick), int(math.Floor(float64(q.Retry)*multipiler))), retryStyle)
+		d.Print(strings.Repeat(string(tick), int(math.Floor(float64(q.Archived)*multipiler))), archivedStyle)
+		d.Print(strings.Repeat(string(tick), int(math.Floor(float64(q.Completed)*multipiler))), completedStyle)
+		d.Print(fmt.Sprintf(" %d", q.Size), baseStyle)
+		d.NL()
+	}
+	d.NL()
+	d.Print("active=", baseStyle)
+	d.Print(string(tick), activeStyle)
+	d.Print(" pending=", baseStyle)
+	d.Print(string(tick), pendingStyle)
+	d.Print(" aggregating=", baseStyle)
+	d.Print(string(tick), aggregatingStyle)
+	d.Print(" scheduled=", baseStyle)
+	d.Print(string(tick), scheduledStyle)
+	d.Print(" retry=", baseStyle)
+	d.Print(string(tick), retryStyle)
+	d.Print(" archived=", baseStyle)
+	d.Print(string(tick), archivedStyle)
+	d.Print(" completed=", baseStyle)
+	d.Print(string(tick), completedStyle)
+	d.NL()
+}
+
+func drawFooter(d *ScreenDrawer, state *State) {
+	if state.err != nil {
+		style := baseStyle.Background(tcell.ColorDarkRed)
+		d.Print(state.err.Error(), style)
+		d.FillLine(' ', style)
+		return
+	}
+	style := baseStyle.Background(tcell.ColorDarkSlateGray).Foreground(tcell.ColorWhite)
+	switch state.view {
+	case viewTypeHelp:
+		d.Print("<Esc>: GoBack", style)
+	default:
+		d.Print("<?>: Help    <Ctrl+C>: Exit ", style)
+	}
+	d.FillLine(' ', style)
+}
+
+// returns the maximum width from the given list of names
+func maxwidth(names []string) int {
+	max := 0
+	for _, s := range names {
+		if w := runewidth.StringWidth(s); w > max {
+			max = w
+		}
+	}
+	return max
+}
+
+// rpad adds padding to the right of a string.
+func rpad(s string, padding int) string {
+	tmpl := fmt.Sprintf("%%-%ds ", padding)
+	return fmt.Sprintf(tmpl, s)
+
+}
+
+// lpad adds padding to the left of a string.
+func lpad(s string, padding int) string {
+	tmpl := fmt.Sprintf("%%%ds ", padding)
+	return fmt.Sprintf(tmpl, s)
+}
+
+// byteCount converts the given bytes into human readable string
+func byteCount(b int64) string {
+	const unit = 1000
+	if b < unit {
+		return fmt.Sprintf("%d B", b)
+
+	}
+	div, exp := int64(unit), 0
+	for n := b / unit; n >= unit; n /= unit {
+		div *= unit
+		exp++
+
+	}
+	return fmt.Sprintf("%.1f %cB", float64(b)/float64(div), "kMGTPE"[exp])
+}
+
+var queueColumnConfigs = []*columnConfig[*asynq.QueueInfo]{
+	{"Queue", alignLeft, func(q *asynq.QueueInfo) string { return q.Queue }},
+	{"State", alignLeft, func(q *asynq.QueueInfo) string { return formatQueueState(q) }},
+	{"Size", alignRight, func(q *asynq.QueueInfo) string { return strconv.Itoa(q.Size) }},
+	{"Latency", alignRight, func(q *asynq.QueueInfo) string { return q.Latency.Round(time.Second).String() }},
+	{"MemoryUsage", alignRight, func(q *asynq.QueueInfo) string { return byteCount(q.MemoryUsage) }},
+	{"Processed", alignRight, func(q *asynq.QueueInfo) string { return strconv.Itoa(q.Processed) }},
+	{"Failed", alignRight, func(q *asynq.QueueInfo) string { return strconv.Itoa(q.Failed) }},
+	{"ErrorRate", alignRight, func(q *asynq.QueueInfo) string { return formatErrorRate(q.Processed, q.Failed) }},
+}
+
+func formatQueueState(q *asynq.QueueInfo) string {
+	if q.Paused {
+		return "PAUSED"
+	}
+	return "RUN"
+}
+
+func formatErrorRate(processed, failed int) string {
+	if processed == 0 {
+		return "-"
+	}
+	return fmt.Sprintf("%.2f", float64(failed)/float64(processed))
+}
+
+func formatNextProcessTime(t time.Time) string {
+	now := time.Now()
+	if t.Before(now) {
+		return "now"
+	}
+	return fmt.Sprintf("in %v", (t.Sub(now).Round(time.Second)))
+}
+
+func formatPastTime(t time.Time) string {
+	now := time.Now()
+	if t.After(now) || t.Equal(now) {
+		return "just now"
+	}
+	return fmt.Sprintf("%v ago", time.Since(t).Round(time.Second))
+}
+
+func drawQueueTable(d *ScreenDrawer, style tcell.Style, state *State) {
+	drawTable(d, style, queueColumnConfigs, state.queues, state.queueTableRowIdx-1)
+}
+
+func drawQueueSummary(d *ScreenDrawer, state *State) {
+	q := state.selectedQueue
+	if q == nil {
+		d.Println("ERROR: Press q to go back", baseStyle)
+		return
+	}
+	d.Print("Name      ", labelStyle)
+	d.Println(q.Queue, baseStyle)
+	d.Print("Size      ", labelStyle)
+	d.Println(strconv.Itoa(q.Size), baseStyle)
+	d.Print("Latency   ", labelStyle)
+	d.Println(q.Latency.Round(time.Second).String(), baseStyle)
+	d.Print("MemUsage  ", labelStyle)
+	d.Println(byteCount(q.MemoryUsage), baseStyle)
+}
+
+// Returns the max number of groups that can be displayed.
+func groupPageSize(s tcell.Screen) int {
+	_, h := s.Size()
+	return h - 16 // height - (# of rows used)
+}
+
+// Returns the number of tasks to fetch.
+func taskPageSize(s tcell.Screen) int {
+	_, h := s.Size()
+	return h - 15 // height - (# of rows used)
+}
+
+func shouldShowGroupTable(state *State) bool {
+	return state.taskState == asynq.TaskStateAggregating && state.selectedGroup == nil
+}
+
+func getTaskTableColumnConfig(taskState asynq.TaskState) []*columnConfig[*asynq.TaskInfo] {
+	switch taskState {
+	case asynq.TaskStateActive:
+		return activeTaskTableColumns
+	case asynq.TaskStatePending:
+		return pendingTaskTableColumns
+	case asynq.TaskStateAggregating:
+		return aggregatingTaskTableColumns
+	case asynq.TaskStateScheduled:
+		return scheduledTaskTableColumns
+	case asynq.TaskStateRetry:
+		return retryTaskTableColumns
+	case asynq.TaskStateArchived:
+		return archivedTaskTableColumns
+	case asynq.TaskStateCompleted:
+		return completedTaskTableColumns
+	}
+	panic("unknown task state")
+}
+
+var activeTaskTableColumns = []*columnConfig[*asynq.TaskInfo]{
+	{"ID", alignLeft, func(t *asynq.TaskInfo) string { return t.ID }},
+	{"Type", alignLeft, func(t *asynq.TaskInfo) string { return t.Type }},
+	{"Retried", alignRight, func(t *asynq.TaskInfo) string { return strconv.Itoa(t.Retried) }},
+	{"Max Retry", alignRight, func(t *asynq.TaskInfo) string { return strconv.Itoa(t.MaxRetry) }},
+	{"Payload", alignLeft, func(t *asynq.TaskInfo) string { return formatByteSlice(t.Payload) }},
+}
+
+var pendingTaskTableColumns = []*columnConfig[*asynq.TaskInfo]{
+	{"ID", alignLeft, func(t *asynq.TaskInfo) string { return t.ID }},
+	{"Type", alignLeft, func(t *asynq.TaskInfo) string { return t.Type }},
+	{"Retried", alignRight, func(t *asynq.TaskInfo) string { return strconv.Itoa(t.Retried) }},
+	{"Max Retry", alignRight, func(t *asynq.TaskInfo) string { return strconv.Itoa(t.MaxRetry) }},
+	{"Payload", alignLeft, func(t *asynq.TaskInfo) string { return formatByteSlice(t.Payload) }},
+}
+
+var aggregatingTaskTableColumns = []*columnConfig[*asynq.TaskInfo]{
+	{"ID", alignLeft, func(t *asynq.TaskInfo) string { return t.ID }},
+	{"Type", alignLeft, func(t *asynq.TaskInfo) string { return t.Type }},
+	{"Payload", alignLeft, func(t *asynq.TaskInfo) string { return formatByteSlice(t.Payload) }},
+	{"Group", alignLeft, func(t *asynq.TaskInfo) string { return t.Group }},
+}
+
+var scheduledTaskTableColumns = []*columnConfig[*asynq.TaskInfo]{
+	{"ID", alignLeft, func(t *asynq.TaskInfo) string { return t.ID }},
+	{"Type", alignLeft, func(t *asynq.TaskInfo) string { return t.Type }},
+	{"Next Process Time", alignLeft, func(t *asynq.TaskInfo) string {
+		return formatNextProcessTime(t.NextProcessAt)
+	}},
+	{"Payload", alignLeft, func(t *asynq.TaskInfo) string { return formatByteSlice(t.Payload) }},
+}
+
+var retryTaskTableColumns = []*columnConfig[*asynq.TaskInfo]{
+	{"ID", alignLeft, func(t *asynq.TaskInfo) string { return t.ID }},
+	{"Type", alignLeft, func(t *asynq.TaskInfo) string { return t.Type }},
+	{"Retry", alignRight, func(t *asynq.TaskInfo) string { return fmt.Sprintf("%d/%d", t.Retried, t.MaxRetry) }},
+	{"Last Failure", alignLeft, func(t *asynq.TaskInfo) string { return t.LastErr }},
+	{"Last Failure Time", alignLeft, func(t *asynq.TaskInfo) string { return formatPastTime(t.LastFailedAt) }},
+	{"Next Process Time", alignLeft, func(t *asynq.TaskInfo) string {
+		return formatNextProcessTime(t.NextProcessAt)
+	}},
+	{"Payload", alignLeft, func(t *asynq.TaskInfo) string { return formatByteSlice(t.Payload) }},
+}
+
+var archivedTaskTableColumns = []*columnConfig[*asynq.TaskInfo]{
+	{"ID", alignLeft, func(t *asynq.TaskInfo) string { return t.ID }},
+	{"Type", alignLeft, func(t *asynq.TaskInfo) string { return t.Type }},
+	{"Retry", alignRight, func(t *asynq.TaskInfo) string { return fmt.Sprintf("%d/%d", t.Retried, t.MaxRetry) }},
+	{"Last Failure", alignLeft, func(t *asynq.TaskInfo) string { return t.LastErr }},
+	{"Last Failure Time", alignLeft, func(t *asynq.TaskInfo) string { return formatPastTime(t.LastFailedAt) }},
+	{"Payload", alignLeft, func(t *asynq.TaskInfo) string { return formatByteSlice(t.Payload) }},
+}
+
+var completedTaskTableColumns = []*columnConfig[*asynq.TaskInfo]{
+	{"ID", alignLeft, func(t *asynq.TaskInfo) string { return t.ID }},
+	{"Type", alignLeft, func(t *asynq.TaskInfo) string { return t.Type }},
+	{"Completion Time", alignLeft, func(t *asynq.TaskInfo) string { return formatPastTime(t.CompletedAt) }},
+	{"Payload", alignLeft, func(t *asynq.TaskInfo) string { return formatByteSlice(t.Payload) }},
+	{"Result", alignLeft, func(t *asynq.TaskInfo) string { return formatByteSlice(t.Result) }},
+}
+
+func drawTaskTable(d *ScreenDrawer, state *State) {
+	if shouldShowGroupTable(state) {
+		drawGroupTable(d, state)
+		return
+	}
+	if len(state.tasks) == 0 {
+		return // print nothing
+	}
+	drawTable(d, baseStyle, getTaskTableColumnConfig(state.taskState), state.tasks, state.taskTableRowIdx-1)
+
+	// Pagination
+	pageSize := taskPageSize(d.Screen())
+	totalCount := getTaskCount(state.selectedQueue, state.taskState)
+	if state.taskState == asynq.TaskStateAggregating {
+		// aggregating tasks are scoped to each group when shown in the table.
+		totalCount = state.selectedGroup.Size
+	}
+	if pageSize < totalCount {
+		start := (state.pageNum-1)*pageSize + 1
+		end := start + len(state.tasks) - 1
+		paginationStyle := baseStyle.Foreground(tcell.ColorLightGray)
+		d.Print(fmt.Sprintf("Showing %d-%d out of %d", start, end, totalCount), paginationStyle)
+		if isNextTaskPageAvailable(d.Screen(), state) {
+			d.Print("  n=NextPage", paginationStyle)
+		}
+		if state.pageNum > 1 {
+			d.Print("  p=PrevPage", paginationStyle)
+		}
+		d.FillLine(' ', paginationStyle)
+	}
+}
+
+func isNextTaskPageAvailable(s tcell.Screen, state *State) bool {
+	totalCount := getTaskCount(state.selectedQueue, state.taskState)
+	end := (state.pageNum-1)*taskPageSize(s) + len(state.tasks)
+	return end < totalCount
+}
+
+func drawGroupTable(d *ScreenDrawer, state *State) {
+	if len(state.groups) == 0 {
+		return // print nothing
+	}
+	d.Println("<<< Select group >>>", baseStyle)
+	colConfigs := []*columnConfig[*asynq.GroupInfo]{
+		{"Name", alignLeft, func(g *asynq.GroupInfo) string { return g.Group }},
+		{"Size", alignRight, func(g *asynq.GroupInfo) string { return strconv.Itoa(g.Size) }},
+	}
+	// pagination
+	pageSize := groupPageSize(d.Screen())
+	total := len(state.groups)
+	start := (state.pageNum - 1) * pageSize
+	end := min(start+pageSize, total)
+	drawTable(d, baseStyle, colConfigs, state.groups[start:end], state.groupTableRowIdx-1)
+
+	if pageSize < total {
+		d.Print(fmt.Sprintf("Showing %d-%d out of %d", start+1, end, total), labelStyle)
+		if end < total {
+			d.Print("  n=NextPage", labelStyle)
+		}
+		if start > 0 {
+			d.Print("  p=PrevPage", labelStyle)
+		}
+	}
+	d.FillLine(' ', labelStyle)
+}
+
+type number interface {
+	int | int64 | float64
+}
+
+// min returns the smaller of x and y. if x==y, returns x
+func min[V number](x, y V) V {
+	if x > y {
+		return y
+	}
+	return x
+}
+
+// Define the order of states to show
+var taskStates = []asynq.TaskState{
+	asynq.TaskStateActive,
+	asynq.TaskStatePending,
+	asynq.TaskStateAggregating,
+	asynq.TaskStateScheduled,
+	asynq.TaskStateRetry,
+	asynq.TaskStateArchived,
+	asynq.TaskStateCompleted,
+}
+
+func nextTaskState(current asynq.TaskState) asynq.TaskState {
+	for i, ts := range taskStates {
+		if current == ts {
+			if i == len(taskStates)-1 {
+				return taskStates[0]
+			} else {
+				return taskStates[i+1]
+			}
+		}
+	}
+	panic("unknown task state")
+}
+
+func prevTaskState(current asynq.TaskState) asynq.TaskState {
+	for i, ts := range taskStates {
+		if current == ts {
+			if i == 0 {
+				return taskStates[len(taskStates)-1]
+			} else {
+				return taskStates[i-1]
+			}
+		}
+	}
+	panic("unknown task state")
+}
+
+func getTaskCount(queue *asynq.QueueInfo, taskState asynq.TaskState) int {
+	switch taskState {
+	case asynq.TaskStateActive:
+		return queue.Active
+	case asynq.TaskStatePending:
+		return queue.Pending
+	case asynq.TaskStateAggregating:
+		return queue.Aggregating
+	case asynq.TaskStateScheduled:
+		return queue.Scheduled
+	case asynq.TaskStateRetry:
+		return queue.Retry
+	case asynq.TaskStateArchived:
+		return queue.Archived
+	case asynq.TaskStateCompleted:
+		return queue.Completed
+	}
+	panic("unkonwn task state")
+}
+
+func drawTaskStateBreakdown(d *ScreenDrawer, style tcell.Style, state *State) {
+	const pad = "    " // padding between states
+	for _, ts := range taskStates {
+		s := style
+		if state.taskState == ts {
+			s = s.Bold(true).Underline(true)
+		}
+		d.Print(fmt.Sprintf("%s:%d", strings.Title(ts.String()), getTaskCount(state.selectedQueue, ts)), s)
+		d.Print(pad, style)
+	}
+	d.NL()
+}
+
+func drawTaskModal(d *ScreenDrawer, state *State) {
+	if state.taskID == "" {
+		return
+	}
+	task := state.selectedTask
+	if task == nil {
+		// task no longer found
+		fns := []func(d *modalRowDrawer){
+			func(d *modalRowDrawer) { d.Print("=== Task Info ===", baseStyle.Bold(true)) },
+			func(d *modalRowDrawer) { d.Print("", baseStyle) },
+			func(d *modalRowDrawer) {
+				d.Print(fmt.Sprintf("Task %q no longer exists", state.taskID), baseStyle)
+			},
+		}
+		withModal(d, fns)
+		return
+	}
+	fns := []func(d *modalRowDrawer){
+		func(d *modalRowDrawer) { d.Print("=== Task Info ===", baseStyle.Bold(true)) },
+		func(d *modalRowDrawer) { d.Print("", baseStyle) },
+		func(d *modalRowDrawer) {
+			d.Print("ID: ", labelStyle)
+			d.Print(task.ID, baseStyle)
+		},
+		func(d *modalRowDrawer) {
+			d.Print("Type: ", labelStyle)
+			d.Print(task.Type, baseStyle)
+		},
+		func(d *modalRowDrawer) {
+			d.Print("State: ", labelStyle)
+			d.Print(task.State.String(), baseStyle)
+		},
+		func(d *modalRowDrawer) {
+			d.Print("Queue: ", labelStyle)
+			d.Print(task.Queue, baseStyle)
+		},
+		func(d *modalRowDrawer) {
+			d.Print("Retry: ", labelStyle)
+			d.Print(fmt.Sprintf("%d/%d", task.Retried, task.MaxRetry), baseStyle)
+		},
+	}
+	if task.LastErr != "" {
+		fns = append(fns, func(d *modalRowDrawer) {
+			d.Print("Last Failure: ", labelStyle)
+			d.Print(task.LastErr, baseStyle)
+		})
+		fns = append(fns, func(d *modalRowDrawer) {
+			d.Print("Last Failure Time: ", labelStyle)
+			d.Print(fmt.Sprintf("%v (%s)", task.LastFailedAt, formatPastTime(task.LastFailedAt)), baseStyle)
+		})
+	}
+	if !task.NextProcessAt.IsZero() {
+		fns = append(fns, func(d *modalRowDrawer) {
+			d.Print("Next Process Time: ", labelStyle)
+			d.Print(fmt.Sprintf("%v (%s)", task.NextProcessAt, formatNextProcessTime(task.NextProcessAt)), baseStyle)
+		})
+	}
+	if !task.CompletedAt.IsZero() {
+		fns = append(fns, func(d *modalRowDrawer) {
+			d.Print("Completion Time: ", labelStyle)
+			d.Print(fmt.Sprintf("%v (%s)", task.CompletedAt, formatPastTime(task.CompletedAt)), baseStyle)
+		})
+	}
+	fns = append(fns, func(d *modalRowDrawer) {
+		d.Print("Payload: ", labelStyle)
+		d.Print(formatByteSlice(task.Payload), baseStyle)
+	})
+	if task.Result != nil {
+		fns = append(fns, func(d *modalRowDrawer) {
+			d.Print("Result: ", labelStyle)
+			d.Print(formatByteSlice(task.Result), baseStyle)
+		})
+	}
+	withModal(d, fns)
+}
+
+// Reports whether the given byte slice is printable (i.e. human readable)
+func isPrintable(data []byte) bool {
+	if !utf8.Valid(data) {
+		return false
+	}
+	isAllSpace := true
+	for _, r := range string(data) {
+		if !unicode.IsGraphic(r) {
+			return false
+		}
+		if !unicode.IsSpace(r) {
+			isAllSpace = false
+		}
+	}
+	return !isAllSpace
+}
+
+func formatByteSlice(data []byte) string {
+	if data == nil {
+		return "<nil>"
+	}
+	if !isPrintable(data) {
+		return "<non-printable>"
+	}
+	return strings.ReplaceAll(string(data), "\n", "  ")
+}
+
+type modalRowDrawer struct {
+	d        *ScreenDrawer
+	width    int // current width occupied by content
+	maxWidth int
+}
+
+// Note: s should not include newline
+func (d *modalRowDrawer) Print(s string, style tcell.Style) {
+	if d.width >= d.maxWidth {
+		return // no longer write to this row
+	}
+	if d.width+runewidth.StringWidth(s) > d.maxWidth {
+		s = truncate(s, d.maxWidth-d.width)
+	}
+	d.d.Print(s, style)
+}
+
+// withModal draws a modal with the given functions row by row.
+func withModal(d *ScreenDrawer, rowPrintFns []func(d *modalRowDrawer)) {
+	w, h := d.Screen().Size()
+	var (
+		modalWidth  = int(math.Floor(float64(w) * 0.6))
+		modalHeight = int(math.Floor(float64(h) * 0.6))
+		rowOffset   = int(math.Floor(float64(h) * 0.2)) // 20% from the top
+		colOffset   = int(math.Floor(float64(w) * 0.2)) // 20% from the left
+	)
+	if modalHeight < 3 {
+		return // no content can be shown
+	}
+	d.Goto(colOffset, rowOffset)
+	d.Print(string(tcell.RuneULCorner), baseStyle)
+	d.Print(strings.Repeat(string(tcell.RuneHLine), modalWidth-2), baseStyle)
+	d.Print(string(tcell.RuneURCorner), baseStyle)
+	d.NL()
+	rowDrawer := modalRowDrawer{
+		d:        d,
+		width:    0,
+		maxWidth: modalWidth - 4, /* borders + paddings */
+	}
+	for i := 1; i < modalHeight-1; i++ {
+		d.Goto(colOffset, rowOffset+i)
+		d.Print(fmt.Sprintf("%c ", tcell.RuneVLine), baseStyle)
+		if i <= len(rowPrintFns) {
+			rowPrintFns[i-1](&rowDrawer)
+		}
+		d.FillUntil(' ', baseStyle, colOffset+modalWidth-2)
+		d.Print(fmt.Sprintf(" %c", tcell.RuneVLine), baseStyle)
+		d.NL()
+	}
+	d.Goto(colOffset, rowOffset+modalHeight-1)
+	d.Print(string(tcell.RuneLLCorner), baseStyle)
+	d.Print(strings.Repeat(string(tcell.RuneHLine), modalWidth-2), baseStyle)
+	d.Print(string(tcell.RuneLRCorner), baseStyle)
+	d.NL()
+}
+
+func adjustWidth(s string, width int) string {
+	sw := runewidth.StringWidth(s)
+	if sw > width {
+		return truncate(s, width)
+	}
+	var b strings.Builder
+	b.WriteString(s)
+	b.WriteString(strings.Repeat(" ", width-sw))
+	return b.String()
+}
+
+// truncates s if s exceeds max length.
+func truncate(s string, max int) string {
+	if runewidth.StringWidth(s) <= max {
+		return s
+	}
+	return string([]rune(s)[:max-1]) + "…"
+}
+
+func drawDebugInfo(d *ScreenDrawer, state *State) {
+	d.Println(state.DebugString(), baseStyle)
+}
+
+func drawHelp(d *ScreenDrawer) {
+	keyStyle := labelStyle.Bold(true)
+	withModal(d, []func(*modalRowDrawer){
+		func(d *modalRowDrawer) { d.Print("=== Help ===", baseStyle.Bold(true)) },
+		func(d *modalRowDrawer) { d.Print("", baseStyle) },
+		func(d *modalRowDrawer) {
+			d.Print("<Enter>", keyStyle)
+			d.Print("              to select", baseStyle)
+		},
+		func(d *modalRowDrawer) {
+			d.Print("<Esc>", keyStyle)
+			d.Print(" or ", baseStyle)
+			d.Print("<q>", keyStyle)
+			d.Print("         to go back", baseStyle)
+		},
+		func(d *modalRowDrawer) {
+			d.Print("<UpArrow>", keyStyle)
+			d.Print(" or ", baseStyle)
+			d.Print("<k>", keyStyle)
+			d.Print("     to move up", baseStyle)
+		},
+		func(d *modalRowDrawer) {
+			d.Print("<DownArrow>", keyStyle)
+			d.Print(" or ", baseStyle)
+			d.Print("<j>", keyStyle)
+			d.Print("   to move down", baseStyle)
+		},
+		func(d *modalRowDrawer) {
+			d.Print("<LeftArrow>", keyStyle)
+			d.Print(" or ", baseStyle)
+			d.Print("<h>", keyStyle)
+			d.Print("   to move left", baseStyle)
+		},
+		func(d *modalRowDrawer) {
+			d.Print("<RightArrow>", keyStyle)
+			d.Print(" or ", baseStyle)
+			d.Print("<l>", keyStyle)
+			d.Print("  to move right", baseStyle)
+		},
+		func(d *modalRowDrawer) {
+			d.Print("<Ctrl+C>", keyStyle)
+			d.Print("             to quit", baseStyle)
+		},
+	})
+}

tools/asynq/cmd/dash/draw_test.go

@@ -0,0 +1,33 @@
+// Copyright 2022 Kentaro Hibino. All rights reserved.
+// Use of this source code is governed by a MIT license
+// that can be found in the LICENSE file.
+
+package dash
+
+import "testing"
+
+func TestTruncate(t *testing.T) {
+	tests := []struct {
+		s    string
+		max  int
+		want string
+	}{
+		{
+			s:    "hello world!",
+			max:  15,
+			want: "hello world!",
+		},
+		{
+			s:    "hello world!",
+			max:  6,
+			want: "hello…",
+		},
+	}
+
+	for _, tc := range tests {
+		got := truncate(tc.s, tc.max)
+		if tc.want != got {
+			t.Errorf("truncate(%q, %d) = %q, want %q", tc.s, tc.max, got, tc.want)
+		}
+	}
+}

tools/asynq/cmd/dash/fetch.go

@@ -0,0 +1,185 @@
+// Copyright 2022 Kentaro Hibino. All rights reserved.
+// Use of this source code is governed by a MIT license
+// that can be found in the LICENSE file.
+
+package dash
+
+import (
+	"sort"
+
+	"github.com/gdamore/tcell/v2"
+	"github.com/hibiken/asynq"
+)
+
+type fetcher interface {
+	// Fetch retries data required by the given state of the dashboard.
+	Fetch(state *State)
+}
+
+type dataFetcher struct {
+	inspector *asynq.Inspector
+	opts      Options
+	s         tcell.Screen
+
+	errorCh  chan<- error
+	queueCh  chan<- *asynq.QueueInfo
+	taskCh   chan<- *asynq.TaskInfo
+	queuesCh chan<- []*asynq.QueueInfo
+	groupsCh chan<- []*asynq.GroupInfo
+	tasksCh  chan<- []*asynq.TaskInfo
+}
+
+func (f *dataFetcher) Fetch(state *State) {
+	switch state.view {
+	case viewTypeQueues:
+		f.fetchQueues()
+	case viewTypeQueueDetails:
+		if shouldShowGroupTable(state) {
+			f.fetchGroups(state.selectedQueue.Queue)
+		} else if state.taskState == asynq.TaskStateAggregating {
+			f.fetchAggregatingTasks(state.selectedQueue.Queue, state.selectedGroup.Group, taskPageSize(f.s), state.pageNum)
+		} else {
+			f.fetchTasks(state.selectedQueue.Queue, state.taskState, taskPageSize(f.s), state.pageNum)
+		}
+		// if the task modal is open, additionally fetch the selected task's info
+		if state.taskID != "" {
+			f.fetchTaskInfo(state.selectedQueue.Queue, state.taskID)
+		}
+	}
+}
+
+func (f *dataFetcher) fetchQueues() {
+	var (
+		inspector = f.inspector
+		queuesCh  = f.queuesCh
+		errorCh   = f.errorCh
+		opts      = f.opts
+	)
+	go fetchQueues(inspector, queuesCh, errorCh, opts)
+}
+
+func fetchQueues(i *asynq.Inspector, queuesCh chan<- []*asynq.QueueInfo, errorCh chan<- error, opts Options) {
+	queues, err := i.Queues()
+	if err != nil {
+		errorCh <- err
+		return
+	}
+	sort.Strings(queues)
+	var res []*asynq.QueueInfo
+	for _, q := range queues {
+		info, err := i.GetQueueInfo(q)
+		if err != nil {
+			errorCh <- err
+			return
+		}
+		res = append(res, info)
+	}
+	queuesCh <- res
+}
+
+func fetchQueueInfo(i *asynq.Inspector, qname string, queueCh chan<- *asynq.QueueInfo, errorCh chan<- error) {
+	q, err := i.GetQueueInfo(qname)
+	if err != nil {
+		errorCh <- err
+		return
+	}
+	queueCh <- q
+}
+
+func (f *dataFetcher) fetchGroups(qname string) {
+	var (
+		i        = f.inspector
+		groupsCh = f.groupsCh
+		errorCh  = f.errorCh
+		queueCh  = f.queueCh
+	)
+	go fetchGroups(i, qname, groupsCh, errorCh)
+	go fetchQueueInfo(i, qname, queueCh, errorCh)
+}
+
+func fetchGroups(i *asynq.Inspector, qname string, groupsCh chan<- []*asynq.GroupInfo, errorCh chan<- error) {
+	groups, err := i.Groups(qname)
+	if err != nil {
+		errorCh <- err
+		return
+	}
+	groupsCh <- groups
+}
+
+func (f *dataFetcher) fetchAggregatingTasks(qname, group string, pageSize, pageNum int) {
+	var (
+		i       = f.inspector
+		tasksCh = f.tasksCh
+		errorCh = f.errorCh
+		queueCh = f.queueCh
+	)
+	go fetchAggregatingTasks(i, qname, group, pageSize, pageNum, tasksCh, errorCh)
+	go fetchQueueInfo(i, qname, queueCh, errorCh)
+}
+
+func fetchAggregatingTasks(i *asynq.Inspector, qname, group string, pageSize, pageNum int,
+	tasksCh chan<- []*asynq.TaskInfo, errorCh chan<- error) {
+	tasks, err := i.ListAggregatingTasks(qname, group, asynq.PageSize(pageSize), asynq.Page(pageNum))
+	if err != nil {
+		errorCh <- err
+		return
+	}
+	tasksCh <- tasks
+}
+
+func (f *dataFetcher) fetchTasks(qname string, taskState asynq.TaskState, pageSize, pageNum int) {
+	var (
+		i       = f.inspector
+		tasksCh = f.tasksCh
+		errorCh = f.errorCh
+		queueCh = f.queueCh
+	)
+	go fetchTasks(i, qname, taskState, pageSize, pageNum, tasksCh, errorCh)
+	go fetchQueueInfo(i, qname, queueCh, errorCh)
+}
+
+func fetchTasks(i *asynq.Inspector, qname string, taskState asynq.TaskState, pageSize, pageNum int,
+	tasksCh chan<- []*asynq.TaskInfo, errorCh chan<- error) {
+	var (
+		tasks []*asynq.TaskInfo
+		err   error
+	)
+	opts := []asynq.ListOption{asynq.PageSize(pageSize), asynq.Page(pageNum)}
+	switch taskState {
+	case asynq.TaskStateActive:
+		tasks, err = i.ListActiveTasks(qname, opts...)
+	case asynq.TaskStatePending:
+		tasks, err = i.ListPendingTasks(qname, opts...)
+	case asynq.TaskStateScheduled:
+		tasks, err = i.ListScheduledTasks(qname, opts...)
+	case asynq.TaskStateRetry:
+		tasks, err = i.ListRetryTasks(qname, opts...)
+	case asynq.TaskStateArchived:
+		tasks, err = i.ListArchivedTasks(qname, opts...)
+	case asynq.TaskStateCompleted:
+		tasks, err = i.ListCompletedTasks(qname, opts...)
+	}
+	if err != nil {
+		errorCh <- err
+		return
+	}
+	tasksCh <- tasks
+}
+
+func (f *dataFetcher) fetchTaskInfo(qname, taskID string) {
+	var (
+		i       = f.inspector
+		taskCh  = f.taskCh
+		errorCh = f.errorCh
+	)
+	go fetchTaskInfo(i, qname, taskID, taskCh, errorCh)
+}
+
+func fetchTaskInfo(i *asynq.Inspector, qname, taskID string, taskCh chan<- *asynq.TaskInfo, errorCh chan<- error) {
+	info, err := i.GetTaskInfo(qname, taskID)
+	if err != nil {
+		errorCh <- err
+		return
+	}
+	taskCh <- info
+}

tools/asynq/cmd/dash/key_event.go

@@ -0,0 +1,317 @@
+// Copyright 2022 Kentaro Hibino. All rights reserved.
+// Use of this source code is governed by a MIT license
+// that can be found in the LICENSE file.
+
+package dash
+
+import (
+	"os"
+	"time"
+
+	"github.com/gdamore/tcell/v2"
+	"github.com/hibiken/asynq"
+)
+
+// keyEventHandler handles keyboard events and updates the state.
+// It delegates data fetching to fetcher and UI rendering to drawer.
+type keyEventHandler struct {
+	s     tcell.Screen
+	state *State
+	done  chan struct{}
+
+	fetcher fetcher
+	drawer  drawer
+
+	ticker       *time.Ticker
+	pollInterval time.Duration
+}
+
+func (h *keyEventHandler) quit() {
+	h.s.Fini()
+	close(h.done)
+	os.Exit(0)
+}
+
+func (h *keyEventHandler) HandleKeyEvent(ev *tcell.EventKey) {
+	if ev.Key() == tcell.KeyEscape || ev.Rune() == 'q' {
+		h.goBack() // Esc and 'q' key have "go back" semantics
+	} else if ev.Key() == tcell.KeyCtrlC {
+		h.quit()
+	} else if ev.Key() == tcell.KeyCtrlL {
+		h.s.Sync()
+	} else if ev.Key() == tcell.KeyDown || ev.Rune() == 'j' {
+		h.handleDownKey()
+	} else if ev.Key() == tcell.KeyUp || ev.Rune() == 'k' {
+		h.handleUpKey()
+	} else if ev.Key() == tcell.KeyRight || ev.Rune() == 'l' {
+		h.handleRightKey()
+	} else if ev.Key() == tcell.KeyLeft || ev.Rune() == 'h' {
+		h.handleLeftKey()
+	} else if ev.Key() == tcell.KeyEnter {
+		h.handleEnterKey()
+	} else if ev.Rune() == '?' {
+		h.showHelp()
+	} else if ev.Rune() == 'n' {
+		h.nextPage()
+	} else if ev.Rune() == 'p' {
+		h.prevPage()
+	}
+}
+
+func (h *keyEventHandler) goBack() {
+	var (
+		state = h.state
+		d     = h.drawer
+		f     = h.fetcher
+	)
+	if state.view == viewTypeHelp {
+		state.view = state.prevView // exit help
+		f.Fetch(state)
+		h.resetTicker()
+		d.Draw(state)
+	} else if state.view == viewTypeQueueDetails {
+		// if task modal is open close it; otherwise go back to the previous view
+		if state.taskID != "" {
+			state.taskID = ""
+			state.selectedTask = nil
+			d.Draw(state)
+		} else {
+			state.view = viewTypeQueues
+			f.Fetch(state)
+			h.resetTicker()
+			d.Draw(state)
+		}
+	} else {
+		h.quit()
+	}
+}
+
+func (h *keyEventHandler) handleDownKey() {
+	switch h.state.view {
+	case viewTypeQueues:
+		h.downKeyQueues()
+	case viewTypeQueueDetails:
+		h.downKeyQueueDetails()
+	}
+}
+
+func (h *keyEventHandler) downKeyQueues() {
+	if h.state.queueTableRowIdx < len(h.state.queues) {
+		h.state.queueTableRowIdx++
+	} else {
+		h.state.queueTableRowIdx = 0 // loop back
+	}
+	h.drawer.Draw(h.state)
+}
+
+func (h *keyEventHandler) downKeyQueueDetails() {
+	s, state := h.s, h.state
+	if shouldShowGroupTable(state) {
+		if state.groupTableRowIdx < groupPageSize(s) {
+			state.groupTableRowIdx++
+		} else {
+			state.groupTableRowIdx = 0 // loop back
+		}
+	} else if state.taskID == "" {
+		if state.taskTableRowIdx < len(state.tasks) {
+			state.taskTableRowIdx++
+		} else {
+			state.taskTableRowIdx = 0 // loop back
+		}
+	}
+	h.drawer.Draw(state)
+}
+
+func (h *keyEventHandler) handleUpKey() {
+	switch h.state.view {
+	case viewTypeQueues:
+		h.upKeyQueues()
+	case viewTypeQueueDetails:
+		h.upKeyQueueDetails()
+	}
+}
+
+func (h *keyEventHandler) upKeyQueues() {
+	state := h.state
+	if state.queueTableRowIdx == 0 {
+		state.queueTableRowIdx = len(state.queues)
+	} else {
+		state.queueTableRowIdx--
+	}
+	h.drawer.Draw(state)
+}
+
+func (h *keyEventHandler) upKeyQueueDetails() {
+	s, state := h.s, h.state
+	if shouldShowGroupTable(state) {
+		if state.groupTableRowIdx == 0 {
+			state.groupTableRowIdx = groupPageSize(s)
+		} else {
+			state.groupTableRowIdx--
+		}
+	} else if state.taskID == "" {
+		if state.taskTableRowIdx == 0 {
+			state.taskTableRowIdx = len(state.tasks)
+		} else {
+			state.taskTableRowIdx--
+		}
+	}
+	h.drawer.Draw(state)
+}
+
+func (h *keyEventHandler) handleEnterKey() {
+	switch h.state.view {
+	case viewTypeQueues:
+		h.enterKeyQueues()
+	case viewTypeQueueDetails:
+		h.enterKeyQueueDetails()
+	}
+}
+
+func (h *keyEventHandler) resetTicker() {
+	h.ticker.Reset(h.pollInterval)
+}
+
+func (h *keyEventHandler) enterKeyQueues() {
+	var (
+		state = h.state
+		f     = h.fetcher
+		d     = h.drawer
+	)
+	if state.queueTableRowIdx != 0 {
+		state.selectedQueue = state.queues[state.queueTableRowIdx-1]
+		state.view = viewTypeQueueDetails
+		state.taskState = asynq.TaskStateActive
+		state.tasks = nil
+		state.pageNum = 1
+		f.Fetch(state)
+		h.resetTicker()
+		d.Draw(state)
+	}
+}
+
+func (h *keyEventHandler) enterKeyQueueDetails() {
+	var (
+		state = h.state
+		f     = h.fetcher
+		d     = h.drawer
+	)
+	if shouldShowGroupTable(state) && state.groupTableRowIdx != 0 {
+		state.selectedGroup = state.groups[state.groupTableRowIdx-1]
+		state.tasks = nil
+		state.pageNum = 1
+		f.Fetch(state)
+		h.resetTicker()
+		d.Draw(state)
+	} else if !shouldShowGroupTable(state) && state.taskTableRowIdx != 0 {
+		task := state.tasks[state.taskTableRowIdx-1]
+		state.selectedTask = task
+		state.taskID = task.ID
+		f.Fetch(state)
+		h.resetTicker()
+		d.Draw(state)
+	}
+
+}
+
+func (h *keyEventHandler) handleLeftKey() {
+	var (
+		state = h.state
+		f     = h.fetcher
+		d     = h.drawer
+	)
+	if state.view == viewTypeQueueDetails && state.taskID == "" {
+		state.taskState = prevTaskState(state.taskState)
+		state.pageNum = 1
+		state.taskTableRowIdx = 0
+		state.tasks = nil
+		state.selectedGroup = nil
+		f.Fetch(state)
+		h.resetTicker()
+		d.Draw(state)
+	}
+}
+
+func (h *keyEventHandler) handleRightKey() {
+	var (
+		state = h.state
+		f     = h.fetcher
+		d     = h.drawer
+	)
+	if state.view == viewTypeQueueDetails && state.taskID == "" {
+		state.taskState = nextTaskState(state.taskState)
+		state.pageNum = 1
+		state.taskTableRowIdx = 0
+		state.tasks = nil
+		state.selectedGroup = nil
+		f.Fetch(state)
+		h.resetTicker()
+		d.Draw(state)
+	}
+}
+
+func (h *keyEventHandler) nextPage() {
+	var (
+		s     = h.s
+		state = h.state
+		f     = h.fetcher
+		d     = h.drawer
+	)
+	if state.view == viewTypeQueueDetails {
+		if shouldShowGroupTable(state) {
+			pageSize := groupPageSize(s)
+			total := len(state.groups)
+			start := (state.pageNum - 1) * pageSize
+			end := start + pageSize
+			if end <= total {
+				state.pageNum++
+				d.Draw(state)
+			}
+		} else {
+			pageSize := taskPageSize(s)
+			totalCount := getTaskCount(state.selectedQueue, state.taskState)
+			if (state.pageNum-1)*pageSize+len(state.tasks) < totalCount {
+				state.pageNum++
+				f.Fetch(state)
+				h.resetTicker()
+			}
+		}
+	}
+}
+
+func (h *keyEventHandler) prevPage() {
+	var (
+		s     = h.s
+		state = h.state
+		f     = h.fetcher
+		d     = h.drawer
+	)
+	if state.view == viewTypeQueueDetails {
+		if shouldShowGroupTable(state) {
+			pageSize := groupPageSize(s)
+			start := (state.pageNum - 1) * pageSize
+			if start > 0 {
+				state.pageNum--
+				d.Draw(state)
+			}
+		} else {
+			if state.pageNum > 1 {
+				state.pageNum--
+				f.Fetch(state)
+				h.resetTicker()
+			}
+		}
+	}
+}
+
+func (h *keyEventHandler) showHelp() {
+	var (
+		state = h.state
+		d     = h.drawer
+	)
+	if state.view != viewTypeHelp {
+		state.prevView = state.view
+		state.view = viewTypeHelp
+		d.Draw(state)
+	}
+}

tools/asynq/cmd/dash/key_event_test.go

@@ -0,0 +1,234 @@
+// Copyright 2022 Kentaro Hibino. All rights reserved.
+// Use of this source code is governed by a MIT license
+// that can be found in the LICENSE file.
+
+package dash
+
+import (
+	"testing"
+	"time"
+
+	"github.com/gdamore/tcell/v2"
+	"github.com/google/go-cmp/cmp"
+	"github.com/hibiken/asynq"
+)
+
+func makeKeyEventHandler(t *testing.T, state *State) *keyEventHandler {
+	ticker := time.NewTicker(time.Second)
+	t.Cleanup(func() { ticker.Stop() })
+	return &keyEventHandler{
+		s:            tcell.NewSimulationScreen("UTF-8"),
+		state:        state,
+		done:         make(chan struct{}),
+		fetcher:      &fakeFetcher{},
+		drawer:       &fakeDrawer{},
+		ticker:       ticker,
+		pollInterval: time.Second,
+	}
+}
+
+type keyEventHandlerTest struct {
+	desc      string            // test description
+	state     *State            // initial state, to be mutated by the handler
+	events    []*tcell.EventKey // keyboard events
+	wantState State             // expected state after the events
+}
+
+func TestKeyEventHandler(t *testing.T) {
+	tests := []*keyEventHandlerTest{
+		{
+			desc:      "navigates to help view",
+			state:     &State{view: viewTypeQueues},
+			events:    []*tcell.EventKey{tcell.NewEventKey(tcell.KeyRune, '?', tcell.ModNone)},
+			wantState: State{view: viewTypeHelp},
+		},
+		{
+			desc: "navigates to queue details view",
+			state: &State{
+				view: viewTypeQueues,
+				queues: []*asynq.QueueInfo{
+					{Queue: "default", Size: 100, Active: 10, Pending: 40, Scheduled: 40, Completed: 10},
+				},
+				queueTableRowIdx: 0,
+			},
+			events: []*tcell.EventKey{
+				tcell.NewEventKey(tcell.KeyRune, 'j', tcell.ModNone),   // down
+				tcell.NewEventKey(tcell.KeyEnter, '\n', tcell.ModNone), // Enter
+			},
+			wantState: State{
+				view: viewTypeQueueDetails,
+				queues: []*asynq.QueueInfo{
+					{Queue: "default", Size: 100, Active: 10, Pending: 40, Scheduled: 40, Completed: 10},
+				},
+				selectedQueue:    &asynq.QueueInfo{Queue: "default", Size: 100, Active: 10, Pending: 40, Scheduled: 40, Completed: 10},
+				queueTableRowIdx: 1,
+				taskState:        asynq.TaskStateActive,
+				pageNum:          1,
+			},
+		},
+		{
+			desc: "does nothing if no queues are present",
+			state: &State{
+				view:             viewTypeQueues,
+				queues:           []*asynq.QueueInfo{}, // empty
+				queueTableRowIdx: 0,
+			},
+			events: []*tcell.EventKey{
+				tcell.NewEventKey(tcell.KeyRune, 'j', tcell.ModNone),   // down
+				tcell.NewEventKey(tcell.KeyEnter, '\n', tcell.ModNone), // Enter
+			},
+			wantState: State{
+				view:             viewTypeQueues,
+				queues:           []*asynq.QueueInfo{},
+				queueTableRowIdx: 0,
+			},
+		},
+		{
+			desc: "opens task info modal",
+			state: &State{
+				view: viewTypeQueueDetails,
+				queues: []*asynq.QueueInfo{
+					{Queue: "default", Size: 500, Active: 10, Pending: 40},
+				},
+				queueTableRowIdx: 1,
+				selectedQueue:    &asynq.QueueInfo{Queue: "default", Size: 50, Active: 10, Pending: 40},
+				taskState:        asynq.TaskStatePending,
+				pageNum:          1,
+				tasks: []*asynq.TaskInfo{
+					{ID: "xxxx", Type: "foo"},
+					{ID: "yyyy", Type: "bar"},
+					{ID: "zzzz", Type: "baz"},
+				},
+				taskTableRowIdx: 2,
+			},
+			events: []*tcell.EventKey{
+				tcell.NewEventKey(tcell.KeyEnter, '\n', tcell.ModNone), // Enter
+			},
+			wantState: State{
+				view: viewTypeQueueDetails,
+				queues: []*asynq.QueueInfo{
+					{Queue: "default", Size: 500, Active: 10, Pending: 40},
+				},
+				queueTableRowIdx: 1,
+				selectedQueue:    &asynq.QueueInfo{Queue: "default", Size: 50, Active: 10, Pending: 40},
+				taskState:        asynq.TaskStatePending,
+				pageNum:          1,
+				tasks: []*asynq.TaskInfo{
+					{ID: "xxxx", Type: "foo"},
+					{ID: "yyyy", Type: "bar"},
+					{ID: "zzzz", Type: "baz"},
+				},
+				taskTableRowIdx: 2,
+				// new states
+				taskID:       "yyyy",
+				selectedTask: &asynq.TaskInfo{ID: "yyyy", Type: "bar"},
+			},
+		},
+		{
+			desc: "Esc closes task info modal",
+			state: &State{
+				view: viewTypeQueueDetails,
+				queues: []*asynq.QueueInfo{
+					{Queue: "default", Size: 500, Active: 10, Pending: 40},
+				},
+				queueTableRowIdx: 1,
+				selectedQueue:    &asynq.QueueInfo{Queue: "default", Size: 50, Active: 10, Pending: 40},
+				taskState:        asynq.TaskStatePending,
+				pageNum:          1,
+				tasks: []*asynq.TaskInfo{
+					{ID: "xxxx", Type: "foo"},
+					{ID: "yyyy", Type: "bar"},
+					{ID: "zzzz", Type: "baz"},
+				},
+				taskTableRowIdx: 2,
+				taskID:          "yyyy", // presence of this field opens the modal
+			},
+			events: []*tcell.EventKey{
+				tcell.NewEventKey(tcell.KeyEscape, ' ', tcell.ModNone), // Esc
+			},
+			wantState: State{
+				view: viewTypeQueueDetails,
+				queues: []*asynq.QueueInfo{
+					{Queue: "default", Size: 500, Active: 10, Pending: 40},
+				},
+				queueTableRowIdx: 1,
+				selectedQueue:    &asynq.QueueInfo{Queue: "default", Size: 50, Active: 10, Pending: 40},
+				taskState:        asynq.TaskStatePending,
+				pageNum:          1,
+				tasks: []*asynq.TaskInfo{
+					{ID: "xxxx", Type: "foo"},
+					{ID: "yyyy", Type: "bar"},
+					{ID: "zzzz", Type: "baz"},
+				},
+				taskTableRowIdx: 2,
+				taskID:          "", // this field should be unset
+			},
+		},
+		{
+			desc: "Arrow keys are disabled while task info modal is open",
+			state: &State{
+				view: viewTypeQueueDetails,
+				queues: []*asynq.QueueInfo{
+					{Queue: "default", Size: 500, Active: 10, Pending: 40},
+				},
+				queueTableRowIdx: 1,
+				selectedQueue:    &asynq.QueueInfo{Queue: "default", Size: 50, Active: 10, Pending: 40},
+				taskState:        asynq.TaskStatePending,
+				pageNum:          1,
+				tasks: []*asynq.TaskInfo{
+					{ID: "xxxx", Type: "foo"},
+					{ID: "yyyy", Type: "bar"},
+					{ID: "zzzz", Type: "baz"},
+				},
+				taskTableRowIdx: 2,
+				taskID:          "yyyy", // presence of this field opens the modal
+			},
+			events: []*tcell.EventKey{
+				tcell.NewEventKey(tcell.KeyLeft, ' ', tcell.ModNone),
+			},
+
+			// no change
+			wantState: State{
+				view: viewTypeQueueDetails,
+				queues: []*asynq.QueueInfo{
+					{Queue: "default", Size: 500, Active: 10, Pending: 40},
+				},
+				queueTableRowIdx: 1,
+				selectedQueue:    &asynq.QueueInfo{Queue: "default", Size: 50, Active: 10, Pending: 40},
+				taskState:        asynq.TaskStatePending,
+				pageNum:          1,
+				tasks: []*asynq.TaskInfo{
+					{ID: "xxxx", Type: "foo"},
+					{ID: "yyyy", Type: "bar"},
+					{ID: "zzzz", Type: "baz"},
+				},
+				taskTableRowIdx: 2,
+				taskID:          "yyyy", // presence of this field opens the modal
+			},
+		},
+		// TODO: Add more tests
+	}
+
+	for _, tc := range tests {
+		t.Run(tc.desc, func(t *testing.T) {
+			h := makeKeyEventHandler(t, tc.state)
+			for _, e := range tc.events {
+				h.HandleKeyEvent(e)
+			}
+			if diff := cmp.Diff(tc.wantState, *tc.state, cmp.AllowUnexported(State{})); diff != "" {
+				t.Errorf("after state was %+v, want %+v: (-want,+got)\n%s", *tc.state, tc.wantState, diff)
+			}
+		})
+	}
+
+}
+
+/*** fake implementation for tests ***/
+
+type fakeFetcher struct{}
+
+func (f *fakeFetcher) Fetch(s *State) {}
+
+type fakeDrawer struct{}
+
+func (d *fakeDrawer) Draw(s *State) {}

tools/asynq/cmd/dash/screen_drawer.go

@@ -0,0 +1,100 @@
+// Copyright 2022 Kentaro Hibino. All rights reserved.
+// Use of this source code is governed by a MIT license
+// that can be found in the LICENSE file.
+
+package dash
+
+import (
+	"strings"
+
+	"github.com/gdamore/tcell/v2"
+	"github.com/mattn/go-runewidth"
+)
+
+/*** Screen Drawer ***/
+
+// ScreenDrawer is used to draw contents on screen.
+//
+// Usage example:
+//    d := NewScreenDrawer(s)
+//    d.Println("Hello world", mystyle)
+//    d.NL() // adds newline
+//    d.Print("foo", mystyle.Bold(true))
+//    d.Print("bar", mystyle.Italic(true))
+type ScreenDrawer struct {
+	l *LineDrawer
+}
+
+func NewScreenDrawer(s tcell.Screen) *ScreenDrawer {
+	return &ScreenDrawer{l: NewLineDrawer(0, s)}
+}
+
+func (d *ScreenDrawer) Print(s string, style tcell.Style) {
+	d.l.Draw(s, style)
+}
+
+func (d *ScreenDrawer) Println(s string, style tcell.Style) {
+	d.Print(s, style)
+	d.NL()
+}
+
+// FillLine prints the given rune until the end of the current line
+// and adds a newline.
+func (d *ScreenDrawer) FillLine(r rune, style tcell.Style) {
+	w, _ := d.Screen().Size()
+	if w-d.l.col < 0 {
+		d.NL()
+		return
+	}
+	s := strings.Repeat(string(r), w-d.l.col)
+	d.Print(s, style)
+	d.NL()
+}
+
+func (d *ScreenDrawer) FillUntil(r rune, style tcell.Style, limit int) {
+	if d.l.col > limit {
+		return // already passed the limit
+	}
+	s := strings.Repeat(string(r), limit-d.l.col)
+	d.Print(s, style)
+}
+
+// NL adds a newline (i.e., moves to the next line).
+func (d *ScreenDrawer) NL() {
+	d.l.row++
+	d.l.col = 0
+}
+
+func (d *ScreenDrawer) Screen() tcell.Screen {
+	return d.l.s
+}
+
+// Goto moves the screendrawer to the specified cell.
+func (d *ScreenDrawer) Goto(x, y int) {
+	d.l.row = y
+	d.l.col = x
+}
+
+// Go to the bottom of the screen.
+func (d *ScreenDrawer) GoToBottom() {
+	_, h := d.Screen().Size()
+	d.l.row = h - 1
+	d.l.col = 0
+}
+
+type LineDrawer struct {
+	s   tcell.Screen
+	row int
+	col int
+}
+
+func NewLineDrawer(row int, s tcell.Screen) *LineDrawer {
+	return &LineDrawer{row: row, col: 0, s: s}
+}
+
+func (d *LineDrawer) Draw(s string, style tcell.Style) {
+	for _, r := range s {
+		d.s.SetContent(d.col, d.row, r, nil, style)
+		d.col += runewidth.RuneWidth(r)
+	}
+}

tools/asynq/cmd/dash/table.go

@@ -0,0 +1,70 @@
+// Copyright 2022 Kentaro Hibino. All rights reserved.
+// Use of this source code is governed by a MIT license
+// that can be found in the LICENSE file.
+
+package dash
+
+import (
+	"github.com/gdamore/tcell/v2"
+	"github.com/mattn/go-runewidth"
+)
+
+type columnAlignment int
+
+const (
+	alignRight columnAlignment = iota
+	alignLeft
+)
+
+type columnConfig[V any] struct {
+	name      string
+	alignment columnAlignment
+	displayFn func(v V) string
+}
+
+type column[V any] struct {
+	*columnConfig[V]
+	width int
+}
+
+// Helper to draw a table.
+func drawTable[V any](d *ScreenDrawer, style tcell.Style, configs []*columnConfig[V], data []V, highlightRowIdx int) {
+	const colBuffer = "    " // extra buffer between columns
+	cols := make([]*column[V], len(configs))
+	for i, cfg := range configs {
+		cols[i] = &column[V]{cfg, runewidth.StringWidth(cfg.name)}
+	}
+	// adjust the column width to accommodate the widest value.
+	for _, v := range data {
+		for _, col := range cols {
+			if w := runewidth.StringWidth(col.displayFn(v)); col.width < w {
+				col.width = w
+			}
+		}
+	}
+	// print header
+	headerStyle := style.Background(tcell.ColorDimGray).Foreground(tcell.ColorWhite)
+	for _, col := range cols {
+		if col.alignment == alignLeft {
+			d.Print(rpad(col.name, col.width)+colBuffer, headerStyle)
+		} else {
+			d.Print(lpad(col.name, col.width)+colBuffer, headerStyle)
+		}
+	}
+	d.FillLine(' ', headerStyle)
+	// print body
+	for i, v := range data {
+		rowStyle := style
+		if highlightRowIdx == i {
+			rowStyle = style.Background(tcell.ColorDarkOliveGreen)
+		}
+		for _, col := range cols {
+			if col.alignment == alignLeft {
+				d.Print(rpad(col.displayFn(v), col.width)+colBuffer, rowStyle)
+			} else {
+				d.Print(lpad(col.displayFn(v), col.width)+colBuffer, rowStyle)
+			}
+		}
+		d.FillLine(' ', rowStyle)
+	}
+}

tools/asynq/cmd/group.go

@@ -0,0 +1,52 @@
+// Copyright 2022 Kentaro Hibino. All rights reserved.
+// Use of this source code is governed by a MIT license
+// that can be found in the LICENSE file.
+
+package cmd
+
+import (
+	"fmt"
+	"os"
+
+	"github.com/MakeNowJust/heredoc/v2"
+	"github.com/spf13/cobra"
+)
+
+func init() {
+	rootCmd.AddCommand(groupCmd)
+	groupCmd.AddCommand(groupListCmd)
+	groupListCmd.Flags().StringP("queue", "q", "", "queue to inspect")
+	groupListCmd.MarkFlagRequired("queue")
+}
+
+var groupCmd = &cobra.Command{
+	Use:   "group <command> [flags]",
+	Short: "Manage groups",
+	Example: heredoc.Doc(`
+		$ asynq group list --queue=myqueue`),
+}
+
+var groupListCmd = &cobra.Command{
+	Use:     "list",
+	Aliases: []string{"ls"},
+	Short:   "List groups",
+	Args:    cobra.NoArgs,
+	Run:     groupLists,
+}
+
+func groupLists(cmd *cobra.Command, args []string) {
+	qname, err := cmd.Flags().GetString("queue")
+	if err != nil {
+		fmt.Println(err)
+		os.Exit(1)
+	}
+	inspector := createInspector()
+	groups, err := inspector.Groups(qname)
+	if len(groups) == 0 {
+		fmt.Printf("No groups found in queue %q\n", qname)
+		return
+	}
+	for _, g := range groups {
+		fmt.Println(g.Group)
+	}
+}

tools/asynq/cmd/migrate.go

@@ -1,404 +0,0 @@
-// Copyright 2020 Kentaro Hibino. All rights reserved.
-// Use of this source code is governed by a MIT license
-// that can be found in the LICENSE file.
-
-package cmd
-
-import (
-	"encoding/json"
-	"fmt"
-	"os"
-	"strings"
-	"time"
-
-	"github.com/go-redis/redis/v7"
-	"github.com/google/uuid"
-	"github.com/hibiken/asynq/internal/base"
-	"github.com/hibiken/asynq/internal/errors"
-	"github.com/hibiken/asynq/internal/rdb"
-	"github.com/spf13/cobra"
-)
-
-// migrateCmd represents the migrate command.
-var migrateCmd = &cobra.Command{
-	Use:   "migrate",
-	Short: fmt.Sprintf("Migrate existing tasks and queues to be asynq%s compatible", base.Version),
-	Long: `Migrate (asynq migrate) will migrate existing tasks and queues in redis to be compatible with the latest version of asynq.
-`,
-	Args: cobra.NoArgs,
-	Run:  migrate,
-}
-
-func init() {
-	rootCmd.AddCommand(migrateCmd)
-}
-
-func backupKey(key string) string {
-	return fmt.Sprintf("%s:backup", key)
-}
-
-func renameKeyAsBackup(c redis.UniversalClient, key string) error {
-	if c.Exists(key).Val() == 0 {
-		return nil // key doesn't exist; no-op
-	}
-	return c.Rename(key, backupKey(key)).Err()
-}
-
-func failIfError(err error, msg string) {
-	if err != nil {
-		fmt.Printf("error: %s: %v\n", msg, err)
-		fmt.Println("*** Please report this issue at https://github.com/hibiken/asynq/issues ***")
-		os.Exit(1)
-	}
-}
-
-func logIfError(err error, msg string) {
-	if err != nil {
-		fmt.Printf("warning: %s: %v\n", msg, err)
-	}
-}
-
-func migrate(cmd *cobra.Command, args []string) {
-	r := createRDB()
-	queues, err := r.AllQueues()
-	failIfError(err, "Failed to get queue names")
-
-	// ---------------------------------------------
-	// Pre-check: Ensure no active servers, tasks.
-	// ---------------------------------------------
-	srvs, err := r.ListServers()
-	failIfError(err, "Failed to get server infos")
-	if len(srvs) > 0 {
-		fmt.Println("(error): Server(s) still running. Please ensure that no asynq servers are running when runnning migrate command.")
-		os.Exit(1)
-	}
-	for _, qname := range queues {
-		stats, err := r.CurrentStats(qname)
-		failIfError(err, "Failed to get stats")
-		if stats.Active > 0 {
-			fmt.Printf("(error): %d active tasks found. Please ensure that no active tasks exist when running migrate command.\n", stats.Active)
-			os.Exit(1)
-		}
-	}
-
-	// ---------------------------------------------
-	// Rename pending key
-	// ---------------------------------------------
-	fmt.Print("Renaming pending keys...")
-	for _, qname := range queues {
-		oldKey := fmt.Sprintf("asynq:{%s}", qname)
-		if r.Client().Exists(oldKey).Val() == 0 {
-			continue
-		}
-		newKey := base.PendingKey(qname)
-		err := r.Client().Rename(oldKey, newKey).Err()
-		failIfError(err, "Failed to rename key")
-	}
-	fmt.Print("Done\n")
-
-	// ---------------------------------------------
-	// Rename keys as backup
-	// ---------------------------------------------
-	fmt.Print("Renaming keys for backup...")
-	for _, qname := range queues {
-		keys := []string{
-			base.ActiveKey(qname),
-			base.PendingKey(qname),
-			base.ScheduledKey(qname),
-			base.RetryKey(qname),
-			base.ArchivedKey(qname),
-		}
-		for _, key := range keys {
-			err := renameKeyAsBackup(r.Client(), key)
-			failIfError(err, fmt.Sprintf("Failed to rename key %q for backup", key))
-		}
-	}
-	fmt.Print("Done\n")
-
-	// ---------------------------------------------
-	// Update to new schema
-	// ---------------------------------------------
-	fmt.Print("Updating to new schema...")
-	for _, qname := range queues {
-		updatePendingMessages(r, qname)
-		updateZSetMessages(r.Client(), base.ScheduledKey(qname), "scheduled")
-		updateZSetMessages(r.Client(), base.RetryKey(qname), "retry")
-		updateZSetMessages(r.Client(), base.ArchivedKey(qname), "archived")
-	}
-	fmt.Print("Done\n")
-
-	// ---------------------------------------------
-	// Delete backup keys
-	// ---------------------------------------------
-	fmt.Print("Deleting backup keys...")
-	for _, qname := range queues {
-		keys := []string{
-			backupKey(base.ActiveKey(qname)),
-			backupKey(base.PendingKey(qname)),
-			backupKey(base.ScheduledKey(qname)),
-			backupKey(base.RetryKey(qname)),
-			backupKey(base.ArchivedKey(qname)),
-		}
-		for _, key := range keys {
-			err := r.Client().Del(key).Err()
-			failIfError(err, "Failed to delete backup key")
-		}
-	}
-	fmt.Print("Done\n")
-}
-
-func UnmarshalOldMessage(encoded string) (*base.TaskMessage, error) {
-	oldMsg, err := DecodeMessage(encoded)
-	if err != nil {
-		return nil, err
-	}
-	payload, err := json.Marshal(oldMsg.Payload)
-	if err != nil {
-		return nil, fmt.Errorf("could not marshal payload: %v", err)
-	}
-	return &base.TaskMessage{
-		Type:         oldMsg.Type,
-		Payload:      payload,
-		ID:           oldMsg.ID,
-		Queue:        oldMsg.Queue,
-		Retry:        oldMsg.Retry,
-		Retried:      oldMsg.Retried,
-		ErrorMsg:     oldMsg.ErrorMsg,
-		LastFailedAt: 0,
-		Timeout:      oldMsg.Timeout,
-		Deadline:     oldMsg.Deadline,
-		UniqueKey:    oldMsg.UniqueKey,
-	}, nil
-}
-
-// TaskMessage from v0.17
-type OldTaskMessage struct {
-	// Type indicates the kind of the task to be performed.
-	Type string
-
-	// Payload holds data needed to process the task.
-	Payload map[string]interface{}
-
-	// ID is a unique identifier for each task.
-	ID uuid.UUID
-
-	// Queue is a name this message should be enqueued to.
-	Queue string
-
-	// Retry is the max number of retry for this task.
-	Retry int
-
-	// Retried is the number of times we've retried this task so far.
-	Retried int
-
-	// ErrorMsg holds the error message from the last failure.
-	ErrorMsg string
-
-	// Timeout specifies timeout in seconds.
-	// If task processing doesn't complete within the timeout, the task will be retried
-	// if retry count is remaining. Otherwise it will be moved to the archive.
-	//
-	// Use zero to indicate no timeout.
-	Timeout int64
-
-	// Deadline specifies the deadline for the task in Unix time,
-	// the number of seconds elapsed since January 1, 1970 UTC.
-	// If task processing doesn't complete before the deadline, the task will be retried
-	// if retry count is remaining. Otherwise it will be moved to the archive.
-	//
-	// Use zero to indicate no deadline.
-	Deadline int64
-
-	// UniqueKey holds the redis key used for uniqueness lock for this task.
-	//
-	// Empty string indicates that no uniqueness lock was used.
-	UniqueKey string
-}
-
-// DecodeMessage unmarshals the given encoded string and returns a decoded task message.
-// Code from v0.17.
-func DecodeMessage(s string) (*OldTaskMessage, error) {
-	d := json.NewDecoder(strings.NewReader(s))
-	d.UseNumber()
-	var msg OldTaskMessage
-	if err := d.Decode(&msg); err != nil {
-		return nil, err
-	}
-	return &msg, nil
-}
-
-func updatePendingMessages(r *rdb.RDB, qname string) {
-	data, err := r.Client().LRange(backupKey(base.PendingKey(qname)), 0, -1).Result()
-	failIfError(err, "Failed to read backup pending key")
-
-	for _, s := range data {
-		msg, err := UnmarshalOldMessage(s)
-		failIfError(err, "Failed to unmarshal message")
-
-		if msg.UniqueKey != "" {
-			ttl, err := r.Client().TTL(msg.UniqueKey).Result()
-			failIfError(err, "Failed to get ttl")
-
-			if ttl > 0 {
-				err = r.Client().Del(msg.UniqueKey).Err()
-				logIfError(err, "Failed to delete unique key")
-			}
-
-			// Regenerate unique key.
-			msg.UniqueKey = base.UniqueKey(msg.Queue, msg.Type, msg.Payload)
-			if ttl > 0 {
-				err = r.EnqueueUnique(msg, ttl)
-			} else {
-				err = r.Enqueue(msg)
-			}
-			failIfError(err, "Failed to enqueue message")
-
-		} else {
-			err := r.Enqueue(msg)
-			failIfError(err, "Failed to enqueue message")
-		}
-	}
-}
-
-// KEYS[1] -> asynq:{<qname>}:t:<task_id>
-// KEYS[2] -> asynq:{<qname>}:scheduled
-// ARGV[1] -> task message data
-// ARGV[2] -> zset score
-// ARGV[3] -> task ID
-// ARGV[4] -> task timeout in seconds (0 if not timeout)
-// ARGV[5] -> task deadline in unix time (0 if no deadline)
-// ARGV[6] -> task state (e.g. "retry", "archived")
-var taskZAddCmd = redis.NewScript(`
-redis.call("HSET", KEYS[1],
-           "msg", ARGV[1],
-           "state", ARGV[6],
-           "timeout", ARGV[4],
-           "deadline", ARGV[5])
-redis.call("ZADD", KEYS[2], ARGV[2], ARGV[3])
-return 1
-`)
-
-// ZAddTask adds task to zset.
-func ZAddTask(c redis.UniversalClient, key string, msg *base.TaskMessage, score float64, state string) error {
-	// Special case; LastFailedAt field is new so assign a value inferred from zscore.
-	if state == "archived" {
-		msg.LastFailedAt = int64(score)
-	}
-
-	encoded, err := base.EncodeMessage(msg)
-	if err != nil {
-		return err
-	}
-	if err := c.SAdd(base.AllQueues, msg.Queue).Err(); err != nil {
-		return err
-	}
-	keys := []string{
-		base.TaskKey(msg.Queue, msg.ID.String()),
-		key,
-	}
-	argv := []interface{}{
-		encoded,
-		score,
-		msg.ID.String(),
-		msg.Timeout,
-		msg.Deadline,
-		state,
-	}
-	return taskZAddCmd.Run(c, keys, argv...).Err()
-}
-
-// KEYS[1] -> unique key
-// KEYS[2] -> asynq:{<qname>}:t:<task_id>
-// KEYS[3] -> zset key (e.g. asynq:{<qname>}:scheduled)
-// --
-// ARGV[1] -> task ID
-// ARGV[2] -> uniqueness lock TTL
-// ARGV[3] -> score (process_at timestamp)
-// ARGV[4] -> task message
-// ARGV[5] -> task timeout in seconds (0 if not timeout)
-// ARGV[6] -> task deadline in unix time (0 if no deadline)
-// ARGV[7] -> task state (oneof "scheduled", "retry", "archived")
-var taskZAddUniqueCmd = redis.NewScript(`
-local ok = redis.call("SET", KEYS[1], ARGV[1], "NX", "EX", ARGV[2])
-if not ok then
-  return 0
-end
-redis.call("HSET", KEYS[2],
-           "msg", ARGV[4],
-           "state", ARGV[7],
-           "timeout", ARGV[5],
-           "deadline", ARGV[6],
-           "unique_key", KEYS[1])
-redis.call("ZADD", KEYS[3], ARGV[3], ARGV[1])
-return 1
-`)
-
-// ScheduleUnique adds the task to the backlog queue to be processed in the future if the uniqueness lock can be acquired.
-// It returns ErrDuplicateTask if the lock cannot be acquired.
-func ZAddTaskUnique(c redis.UniversalClient, key string, msg *base.TaskMessage, score float64, state string, ttl time.Duration) error {
-	encoded, err := base.EncodeMessage(msg)
-	if err != nil {
-		return err
-	}
-	if err := c.SAdd(base.AllQueues, msg.Queue).Err(); err != nil {
-		return err
-	}
-	keys := []string{
-		msg.UniqueKey,
-		base.TaskKey(msg.Queue, msg.ID.String()),
-		key,
-	}
-	argv := []interface{}{
-		msg.ID.String(),
-		int(ttl.Seconds()),
-		score,
-		encoded,
-		msg.Timeout,
-		msg.Deadline,
-		state,
-	}
-	res, err := taskZAddUniqueCmd.Run(c, keys, argv...).Result()
-	if err != nil {
-		return err
-	}
-	n, ok := res.(int64)
-	if !ok {
-		return errors.E(errors.Internal, fmt.Sprintf("cast error: unexpected return value from Lua script: %v", res))
-	}
-	if n == 0 {
-		return errors.E(errors.AlreadyExists, errors.ErrDuplicateTask)
-	}
-	return nil
-}
-
-func updateZSetMessages(c redis.UniversalClient, key, state string) {
-	zs, err := c.ZRangeWithScores(backupKey(key), 0, -1).Result()
-	failIfError(err, "Failed to read")
-
-	for _, z := range zs {
-		msg, err := UnmarshalOldMessage(z.Member.(string))
-		failIfError(err, "Failed to unmarshal message")
-
-		if msg.UniqueKey != "" {
-			ttl, err := c.TTL(msg.UniqueKey).Result()
-			failIfError(err, "Failed to get ttl")
-
-			if ttl > 0 {
-				err = c.Del(msg.UniqueKey).Err()
-				logIfError(err, "Failed to delete unique key")
-			}
-
-			// Regenerate unique key.
-			msg.UniqueKey = base.UniqueKey(msg.Queue, msg.Type, msg.Payload)
-			if ttl > 0 {
-				err = ZAddTaskUnique(c, key, msg, z.Score, state, ttl)
-			} else {
-				err = ZAddTask(c, key, msg, z.Score, state)
-			}
-			failIfError(err, "Failed to zadd message")
-		} else {
-			err := ZAddTask(c, key, msg, z.Score, state)
-			failIfError(err, "Failed to enqueue scheduled message")
-		}
-	}
-}

tools/asynq/cmd/queue.go

@@ -9,6 +9,7 @@ import (
 	"io"
 	"os"
 
+	"github.com/MakeNowJust/heredoc/v2"
 	"github.com/fatih/color"
 	"github.com/hibiken/asynq"
 	"github.com/hibiken/asynq/internal/errors"
@@ -31,51 +32,75 @@ func init() {
 }
 
 var queueCmd = &cobra.Command{
-	Use:   "queue",
+	Use:   "queue <command> [flags]",
 	Short: "Manage queues",
+	Example: heredoc.Doc(`
+	  $ asynq queue ls
+	  $ asynq queue inspect myqueue
+	  $ asynq queue pause myqueue`),
 }
 
 var queueListCmd = &cobra.Command{
-	Use:   "ls",
-	Short: "List queues",
+	Use:     "list",
+	Short:   "List queues",
+	Aliases: []string{"ls"},
 	// TODO: Use RunE instead?
 	Run: queueList,
 }
 
 var queueInspectCmd = &cobra.Command{
-	Use:   "inspect QUEUE [QUEUE...]",
+	Use:   "inspect <queue> [<queue>...]",
 	Short: "Display detailed information on one or more queues",
 	Args:  cobra.MinimumNArgs(1),
 	// TODO: Use RunE instead?
 	Run: queueInspect,
+	Example: heredoc.Doc(`
+		$ asynq queue inspect myqueue
+		$ asynq queue inspect queue1 queue2 queue3`),
 }
 
 var queueHistoryCmd = &cobra.Command{
-	Use:   "history QUEUE [QUEUE...]",
+	Use:   "history <queue> [<queue>...]",
 	Short: "Display historical aggregate data from one or more queues",
 	Args:  cobra.MinimumNArgs(1),
 	Run:   queueHistory,
+	Example: heredoc.Doc(`
+		$ asynq queue history myqueue
+		$ asynq queue history queue1 queue2 queue3
+		$ asynq queue history myqueue --days=90`),
 }
 
 var queuePauseCmd = &cobra.Command{
-	Use:   "pause QUEUE [QUEUE...]",
+	Use:   "pause <queue> [<queue>...]",
 	Short: "Pause one or more queues",
 	Args:  cobra.MinimumNArgs(1),
 	Run:   queuePause,
+	Example: heredoc.Doc(`
+		$ asynq queue pause myqueue
+		$ asynq queue pause queue1 queue2 queue3`),
 }
 
 var queueUnpauseCmd = &cobra.Command{
-	Use:   "unpause QUEUE [QUEUE...]",
-	Short: "Unpause one or more queues",
-	Args:  cobra.MinimumNArgs(1),
-	Run:   queueUnpause,
+	Use:     "resume <queue> [<queue>...]",
+	Short:   "Resume (unpause) one or more queues",
+	Args:    cobra.MinimumNArgs(1),
+	Aliases: []string{"unpause"},
+	Run:     queueUnpause,
+	Example: heredoc.Doc(`
+		$ asynq queue resume myqueue
+		$ asynq queue resume queue1 queue2 queue3`),
 }
 
 var queueRemoveCmd = &cobra.Command{
-	Use:   "rm QUEUE [QUEUE...]",
-	Short: "Remove one or more queues",
-	Args:  cobra.MinimumNArgs(1),
-	Run:   queueRemove,
+	Use:     "remove <queue> [<queue>...]",
+	Short:   "Remove one or more queues",
+	Aliases: []string{"rm", "delete"},
+	Args:    cobra.MinimumNArgs(1),
+	Run:     queueRemove,
+	Example: heredoc.Doc(`
+		$ asynq queue rm myqueue
+		$ asynq queue rm queue1 queue2 queue3
+		$ asynq queue rm myqueue --force`),
 }
 
 func queueList(cmd *cobra.Command, args []string) {
@@ -145,12 +170,13 @@ func printQueueInfo(info *asynq.QueueInfo) {
 	bold.Println("Queue Info")
 	fmt.Printf("Name:   %s\n", info.Queue)
 	fmt.Printf("Size:   %d\n", info.Size)
+	fmt.Printf("Groups: %d\n", info.Groups)
 	fmt.Printf("Paused: %t\n\n", info.Paused)
 	bold.Println("Task Count by State")
 	printTable(
-		[]string{"active", "pending", "scheduled", "retry", "archived"},
+		[]string{"active", "pending", "aggregating", "scheduled", "retry", "archived", "completed"},
 		func(w io.Writer, tmpl string) {
-			fmt.Fprintf(w, tmpl, info.Active, info.Pending, info.Scheduled, info.Retry, info.Archived)
+			fmt.Fprintf(w, tmpl, info.Active, info.Pending, info.Aggregating, info.Scheduled, info.Retry, info.Archived, info.Completed)
 		},
 	)
 	fmt.Println()

tools/asynq/cmd/root.go

@@ -11,14 +11,19 @@ import (
 	"os"
 	"strings"
 	"text/tabwriter"
+	"time"
 	"unicode"
 	"unicode/utf8"
 
-	"github.com/go-redis/redis/v7"
+	"github.com/MakeNowJust/heredoc/v2"
+	"github.com/fatih/color"
 	"github.com/hibiken/asynq"
 	"github.com/hibiken/asynq/internal/base"
 	"github.com/hibiken/asynq/internal/rdb"
+	"github.com/redis/go-redis/v9"
 	"github.com/spf13/cobra"
+	"github.com/spf13/pflag"
+	"golang.org/x/exp/utf8string"
 
 	homedir "github.com/mitchellh/go-homedir"
 	"github.com/spf13/viper"
@@ -35,14 +40,27 @@ var (
 	useRedisCluster bool
 	clusterAddrs    string
 	tlsServerName   string
+	insecure        bool
 )
 
 // rootCmd represents the base command when called without any subcommands
 var rootCmd = &cobra.Command{
-	Use:     "asynq",
-	Short:   "A monitoring tool for asynq queues",
-	Long:    `Asynq is a montoring CLI to inspect tasks and queues managed by asynq.`,
+	Use:     "asynq <command> <subcommand> [flags]",
+	Short:   "Asynq CLI",
+	Long:    `Command line tool to inspect tasks and queues managed by Asynq`,
 	Version: base.Version,
+
+	SilenceUsage:  true,
+	SilenceErrors: true,
+
+	Example: heredoc.Doc(`
+		$ asynq stats
+		$ asynq queue pause myqueue
+		$ asynq task list --queue=myqueue --state=archived`),
+	Annotations: map[string]string{
+		"help:feedback": heredoc.Doc(`
+			Open an issue at https://github.com/hibiken/asynq/issues/new/choose`),
+	},
 }
 
 var versionOutput = fmt.Sprintf("asynq version %s\n", base.Version)
@@ -64,22 +82,241 @@ func Execute() {
 	}
 }
 
+func isRootCmd(cmd *cobra.Command) bool {
+	return cmd != nil && !cmd.HasParent()
+}
+
+// displayLine represents a line displayed in the output as '<name> <desc>',
+// where pad is used to pad the name from desc.
+type displayLine struct {
+	name string
+	desc string
+	pad  int // number of rpad
+}
+
+func (l *displayLine) String() string {
+	return rpad(l.name, l.pad) + l.desc
+}
+
+type displayLines []*displayLine
+
+func (dls displayLines) String() string {
+	var lines []string
+	for _, dl := range dls {
+		lines = append(lines, dl.String())
+	}
+	return strings.Join(lines, "\n")
+}
+
+// Capitalize the first word in the given string.
+func capitalize(s string) string {
+	str := utf8string.NewString(s)
+	if str.RuneCount() == 0 {
+		return ""
+	}
+	var b strings.Builder
+	b.WriteString(strings.ToUpper(string(str.At(0))))
+	b.WriteString(str.Slice(1, str.RuneCount()))
+	return b.String()
+}
+
+func rootHelpFunc(cmd *cobra.Command, args []string) {
+	// Display helpful error message when user mistypes a subcommand (e.g. 'asynq queue lst').
+	if isRootCmd(cmd.Parent()) && len(args) >= 2 && args[1] != "--help" && args[1] != "-h" {
+		printSubcommandSuggestions(cmd, args[1])
+		return
+	}
+
+	var lines []*displayLine
+	var commands []*displayLine
+	for _, c := range cmd.Commands() {
+		if c.Hidden || c.Short == "" || c.Name() == "help" {
+			continue
+		}
+		l := &displayLine{name: c.Name() + ":", desc: capitalize(c.Short)}
+		commands = append(commands, l)
+		lines = append(lines, l)
+	}
+	var localFlags []*displayLine
+	cmd.LocalFlags().VisitAll(func(f *pflag.Flag) {
+		l := &displayLine{name: "--" + f.Name, desc: capitalize(f.Usage)}
+		localFlags = append(localFlags, l)
+		lines = append(lines, l)
+	})
+	var inheritedFlags []*displayLine
+	cmd.InheritedFlags().VisitAll(func(f *pflag.Flag) {
+		l := &displayLine{name: "--" + f.Name, desc: capitalize(f.Usage)}
+		inheritedFlags = append(inheritedFlags, l)
+		lines = append(lines, l)
+	})
+	adjustPadding(lines...)
+
+	type helpEntry struct {
+		Title string
+		Body  string
+	}
+	var helpEntries []*helpEntry
+	desc := cmd.Long
+	if desc == "" {
+		desc = cmd.Short
+	}
+	if desc != "" {
+		helpEntries = append(helpEntries, &helpEntry{"", desc})
+	}
+	helpEntries = append(helpEntries, &helpEntry{"USAGE", cmd.UseLine()})
+	if len(commands) > 0 {
+		helpEntries = append(helpEntries, &helpEntry{"COMMANDS", displayLines(commands).String()})
+	}
+	if cmd.LocalFlags().HasFlags() {
+		helpEntries = append(helpEntries, &helpEntry{"FLAGS", displayLines(localFlags).String()})
+	}
+	if cmd.InheritedFlags().HasFlags() {
+		helpEntries = append(helpEntries, &helpEntry{"INHERITED FLAGS", displayLines(inheritedFlags).String()})
+	}
+	if cmd.Example != "" {
+		helpEntries = append(helpEntries, &helpEntry{"EXAMPLES", cmd.Example})
+	}
+	helpEntries = append(helpEntries, &helpEntry{"LEARN MORE", heredoc.Doc(`
+		Use 'asynq <command> <subcommand> --help' for more information about a command.`)})
+	if s, ok := cmd.Annotations["help:feedback"]; ok {
+		helpEntries = append(helpEntries, &helpEntry{"FEEDBACK", s})
+	}
+
+	out := cmd.OutOrStdout()
+	bold := color.New(color.Bold)
+	for _, e := range helpEntries {
+		if e.Title != "" {
+			// If there is a title, add indentation to each line in the body
+			bold.Fprintln(out, e.Title)
+			fmt.Fprintln(out, indent(e.Body, 2 /* spaces */))
+		} else {
+			// If there is no title, print the body as is
+			fmt.Fprintln(out, e.Body)
+		}
+		fmt.Fprintln(out)
+	}
+}
+
+func rootUsageFunc(cmd *cobra.Command) error {
+	out := cmd.OutOrStdout()
+	fmt.Fprintf(out, "Usage: %s", cmd.UseLine())
+	if subcmds := cmd.Commands(); len(subcmds) > 0 {
+		fmt.Fprint(out, "\n\nAvailable commands:\n")
+		for _, c := range subcmds {
+			if c.Hidden {
+				continue
+			}
+			fmt.Fprintf(out, "  %s\n", c.Name())
+		}
+	}
+
+	var localFlags []*displayLine
+	cmd.LocalFlags().VisitAll(func(f *pflag.Flag) {
+		localFlags = append(localFlags, &displayLine{name: "--" + f.Name, desc: capitalize(f.Usage)})
+	})
+	adjustPadding(localFlags...)
+	if len(localFlags) > 0 {
+		fmt.Fprint(out, "\n\nFlags:\n")
+		for _, l := range localFlags {
+			fmt.Fprintf(out, "  %s\n", l.String())
+		}
+	}
+	return nil
+}
+
+func printSubcommandSuggestions(cmd *cobra.Command, arg string) {
+	out := cmd.OutOrStdout()
+	fmt.Fprintf(out, "unknown command %q for %q\n", arg, cmd.CommandPath())
+	if cmd.SuggestionsMinimumDistance <= 0 {
+		cmd.SuggestionsMinimumDistance = 2
+	}
+	candidates := cmd.SuggestionsFor(arg)
+	if len(candidates) > 0 {
+		fmt.Fprint(out, "\nDid you mean this?\n")
+		for _, c := range candidates {
+			fmt.Fprintf(out, "\t%s\n", c)
+		}
+	}
+	fmt.Fprintln(out)
+	rootUsageFunc(cmd)
+}
+
+func adjustPadding(lines ...*displayLine) {
+	// find the maximum width of the name
+	max := 0
+	for _, l := range lines {
+		if n := utf8.RuneCountInString(l.name); n > max {
+			max = n
+		}
+	}
+	for _, l := range lines {
+		l.pad = max
+	}
+}
+
+// rpad adds padding to the right of a string.
+func rpad(s string, padding int) string {
+	tmpl := fmt.Sprintf("%%-%ds ", padding)
+	return fmt.Sprintf(tmpl, s)
+
+}
+
+// lpad adds padding to the left of a string.
+func lpad(s string, padding int) string {
+	tmpl := fmt.Sprintf("%%%ds ", padding)
+	return fmt.Sprintf(tmpl, s)
+}
+
+// indent indents the given text by given spaces.
+func indent(text string, space int) string {
+	if len(text) == 0 {
+		return ""
+	}
+	var b strings.Builder
+	indentation := strings.Repeat(" ", space)
+	lastRune := '\n'
+	for _, r := range text {
+		if lastRune == '\n' {
+			b.WriteString(indentation)
+		}
+		b.WriteRune(r)
+		lastRune = r
+	}
+	return b.String()
+}
+
+// dedent removes any indentation from the given text.
+func dedent(text string) string {
+	lines := strings.Split(text, "\n")
+	var b strings.Builder
+	for _, l := range lines {
+		b.WriteString(strings.TrimLeftFunc(l, unicode.IsSpace))
+		b.WriteRune('\n')
+	}
+	return b.String()
+}
+
 func init() {
 	cobra.OnInitialize(initConfig)
 
+	rootCmd.SetHelpFunc(rootHelpFunc)
+	rootCmd.SetUsageFunc(rootUsageFunc)
+
 	rootCmd.AddCommand(versionCmd)
 	rootCmd.SetVersionTemplate(versionOutput)
 
-	rootCmd.PersistentFlags().StringVar(&cfgFile, "config", "", "config file to set flag defaut values (default is $HOME/.asynq.yaml)")
-	rootCmd.PersistentFlags().StringVarP(&uri, "uri", "u", "127.0.0.1:6379", "redis server URI")
-	rootCmd.PersistentFlags().IntVarP(&db, "db", "n", 0, "redis database number (default is 0)")
-	rootCmd.PersistentFlags().StringVarP(&password, "password", "p", "", "password to use when connecting to redis server")
-	rootCmd.PersistentFlags().BoolVar(&useRedisCluster, "cluster", false, "connect to redis cluster")
+	rootCmd.PersistentFlags().StringVar(&cfgFile, "config", "", "Config file to set flag defaut values (default is $HOME/.asynq.yaml)")
+	rootCmd.PersistentFlags().StringVarP(&uri, "uri", "u", "127.0.0.1:6379", "Redis server URI")
+	rootCmd.PersistentFlags().IntVarP(&db, "db", "n", 0, "Redis database number (default is 0)")
+	rootCmd.PersistentFlags().StringVarP(&password, "password", "p", "", "Password to use when connecting to redis server")
+	rootCmd.PersistentFlags().BoolVar(&useRedisCluster, "cluster", false, "Connect to redis cluster")
 	rootCmd.PersistentFlags().StringVar(&clusterAddrs, "cluster_addrs",
 		"127.0.0.1:7000,127.0.0.1:7001,127.0.0.1:7002,127.0.0.1:7003,127.0.0.1:7004,127.0.0.1:7005",
-		"list of comma-separated redis server addresses")
+		"List of comma-separated redis server addresses")
 	rootCmd.PersistentFlags().StringVar(&tlsServerName, "tls_server",
-		"", "server name for TLS validation")
+		"", "Server name for TLS validation")
+	rootCmd.PersistentFlags().BoolVar(&insecure, "insecure",
+		false, "Allow insecure TLS connection by skipping cert validation")
 	// Bind flags with config.
 	viper.BindPFlag("uri", rootCmd.PersistentFlags().Lookup("uri"))
 	viper.BindPFlag("db", rootCmd.PersistentFlags().Lookup("db"))
@@ -87,6 +324,7 @@ func init() {
 	viper.BindPFlag("cluster", rootCmd.PersistentFlags().Lookup("cluster"))
 	viper.BindPFlag("cluster_addrs", rootCmd.PersistentFlags().Lookup("cluster_addrs"))
 	viper.BindPFlag("tls_server", rootCmd.PersistentFlags().Lookup("tls_server"))
+	viper.BindPFlag("insecure", rootCmd.PersistentFlags().Lookup("insecure"))
 }
 
 // initConfig reads in config file and ENV variables if set.
@@ -118,7 +356,7 @@ func initConfig() {
 // createRDB creates a RDB instance using flag values and returns it.
 func createRDB() *rdb.RDB {
 	var c redis.UniversalClient
-	if useRedisCluster {
+	if viper.GetBool("cluster") {
 		addrs := strings.Split(viper.GetString("cluster_addrs"), ",")
 		c = redis.NewClusterClient(&redis.ClusterOptions{
 			Addrs:     addrs,
@@ -136,13 +374,18 @@ func createRDB() *rdb.RDB {
 	return rdb.NewRDB(c)
 }
 
-// createRDB creates a Inspector instance using flag values and returns it.
+// createClient creates a Client instance using flag values and returns it.
+func createClient() *asynq.Client {
+	return asynq.NewClient(getRedisConnOpt())
+}
+
+// createInspector creates a Inspector instance using flag values and returns it.
 func createInspector() *asynq.Inspector {
 	return asynq.NewInspector(getRedisConnOpt())
 }
 
 func getRedisConnOpt() asynq.RedisConnOpt {
-	if useRedisCluster {
+	if viper.GetBool("cluster") {
 		addrs := strings.Split(viper.GetString("cluster_addrs"), ",")
 		return asynq.RedisClusterClientOpt{
 			Addrs:     addrs,
@@ -163,7 +406,7 @@ func getTLSConfig() *tls.Config {
 	if tlsServer == "" {
 		return nil
 	}
-	return &tls.Config{ServerName: tlsServer}
+	return &tls.Config{ServerName: tlsServer, InsecureSkipVerify: viper.GetBool("insecure")}
 }
 
 // printTable is a helper function to print data in table format.
@@ -199,9 +442,9 @@ func printTable(cols []string, printRows func(w io.Writer, tmpl string)) {
 	tw.Flush()
 }
 
-// formatPayload returns string representation of payload if data is printable.
-// If data is not printable, it returns a string describing payload is not printable.
-func formatPayload(payload []byte) string {
+// sprintBytes returns a string representation of the given byte slice if data is printable.
+// If data is not printable, it returns a string describing it is not printable.
+func sprintBytes(payload []byte) string {
 	if !isPrintable(payload) {
 		return "non-printable bytes"
 	}
@@ -223,3 +466,37 @@ func isPrintable(data []byte) bool {
 	}
 	return !isAllSpace
 }
+
+// Helper to turn a command line flag into a duration
+func getDuration(cmd *cobra.Command, arg string) time.Duration {
+	durationStr, err := cmd.Flags().GetString(arg)
+	if err != nil {
+		fmt.Printf("error: %v\n", err)
+		os.Exit(1)
+	}
+
+	duration, err := time.ParseDuration(durationStr)
+	if err != nil {
+		fmt.Printf("error: %v\n", err)
+		os.Exit(1)
+	}
+
+	return duration
+}
+
+// Helper to turn a command line flag into a time
+func getTime(cmd *cobra.Command, arg string) time.Time {
+	timeStr, err := cmd.Flags().GetString(arg)
+	if err != nil {
+		fmt.Printf("error: %v\n", err)
+		os.Exit(1)
+	}
+
+	timeVal, err := time.Parse(time.RFC3339, timeStr)
+	if err != nil {
+		fmt.Printf("error: %v\n", err)
+		os.Exit(1)
+	}
+
+	return timeVal
+}

tools/asynq/cmd/server.go

@@ -12,6 +12,7 @@ import (
 	"strings"
 	"time"
 
+	"github.com/MakeNowJust/heredoc/v2"
 	"github.com/spf13/cobra"
 )
 
@@ -21,13 +22,16 @@ func init() {
 }
 
 var serverCmd = &cobra.Command{
-	Use:   "server",
+	Use:   "server <command> [flags]",
 	Short: "Manage servers",
+	Example: heredoc.Doc(`
+		$ asynq server list`),
 }
 
 var serverListCmd = &cobra.Command{
-	Use:   "ls",
-	Short: "List servers",
+	Use:     "list",
+	Aliases: []string{"ls"},
+	Short:   "List servers",
 	Long: `Server list (asynq server ls) shows all running worker servers
 pulling tasks from the given redis instance.
 

tools/asynq/cmd/stats.go

@@ -5,14 +5,18 @@
 package cmd
 
 import (
+	"encoding/json"
 	"fmt"
 	"io"
+	"math"
 	"os"
 	"strconv"
 	"strings"
 	"text/tabwriter"
 	"time"
+	"unicode/utf8"
 
+	"github.com/MakeNowJust/heredoc/v2"
 	"github.com/fatih/color"
 	"github.com/hibiken/asynq/internal/rdb"
 	"github.com/spf13/cobra"
@@ -21,25 +25,24 @@ import (
 // statsCmd represents the stats command
 var statsCmd = &cobra.Command{
 	Use:   "stats",
-	Short: "Shows current state of the tasks and queues",
-	Long: `Stats (aysnq stats) will show the overview of tasks and queues at that instant.
+	Short: "View current state",
+	Long: heredoc.Doc(`
+	  Stats shows the overview of tasks and queues at that instant.
 
-Specifically, the command shows the following:
-* Number of tasks in each state
-* Number of tasks in each queue
-* Aggregate data for the current day
-* Basic information about the running redis instance
-
-To monitor the tasks continuously, it's recommended that you run this
-command in conjunction with the watch command.
-
-Example: watch -n 3 asynq stats -> Shows current state of tasks every three seconds`,
+	  The command shows the following:
+	    * Number of tasks in each state
+	    * Number of tasks in each queue
+	    * Aggregate data for the current day
+	    * Basic information about the running redis instance`),
 	Args: cobra.NoArgs,
 	Run:  stats,
 }
 
+var jsonFlag bool
+
 func init() {
 	rootCmd.AddCommand(statsCmd)
+	statsCmd.Flags().BoolVar(&jsonFlag, "json", false, "Output stats in JSON format.")
 
 	// Here you will define your flags and configuration settings.
 
@@ -53,14 +56,22 @@ func init() {
 }
 
 type AggregateStats struct {
-	Active    int
-	Pending   int
-	Scheduled int
-	Retry     int
-	Archived  int
-	Processed int
-	Failed    int
-	Timestamp time.Time
+	Active      int       `json:"active"`
+	Pending     int       `json:"pending"`
+	Aggregating int       `json:"aggregating"`
+	Scheduled   int       `json:"scheduled"`
+	Retry       int       `json:"retry"`
+	Archived    int       `json:"archived"`
+	Completed   int       `json:"completed"`
+	Processed   int       `json:"processed"`
+	Failed      int       `json:"failed"`
+	Timestamp   time.Time `json:"timestamp"`
+}
+
+type FullStats struct {
+	Aggregate  AggregateStats    `json:"aggregate"`
+	QueueStats []*rdb.Stats      `json:"queues"`
+	RedisInfo  map[string]string `json:"redis"`
 }
 
 func stats(cmd *cobra.Command, args []string) {
@@ -82,9 +93,11 @@ func stats(cmd *cobra.Command, args []string) {
 		}
 		aggStats.Active += s.Active
 		aggStats.Pending += s.Pending
+		aggStats.Aggregating += s.Aggregating
 		aggStats.Scheduled += s.Scheduled
 		aggStats.Retry += s.Retry
 		aggStats.Archived += s.Archived
+		aggStats.Completed += s.Completed
 		aggStats.Processed += s.Processed
 		aggStats.Failed += s.Failed
 		aggStats.Timestamp = s.Timestamp
@@ -100,6 +113,23 @@ func stats(cmd *cobra.Command, args []string) {
 		fmt.Println(err)
 		os.Exit(1)
 	}
+
+	if jsonFlag {
+		statsJSON, err := json.Marshal(FullStats{
+			Aggregate:  aggStats,
+			QueueStats: stats,
+			RedisInfo:  info,
+		})
+
+		if err != nil {
+			fmt.Println(err)
+			os.Exit(1)
+		}
+
+		fmt.Println(string(statsJSON))
+		return
+	}
+
 	bold := color.New(color.Bold)
 	bold.Println("Task Count by State")
 	printStatsByState(&aggStats)
@@ -124,22 +154,50 @@ func stats(cmd *cobra.Command, args []string) {
 }
 
 func printStatsByState(s *AggregateStats) {
-	format := strings.Repeat("%v\t", 5) + "\n"
+	format := strings.Repeat("%v\t", 7) + "\n"
 	tw := new(tabwriter.Writer).Init(os.Stdout, 0, 8, 2, ' ', 0)
-	fmt.Fprintf(tw, format, "active", "pending", "scheduled", "retry", "archived")
-	fmt.Fprintf(tw, format, "----------", "--------", "---------", "-----", "----")
-	fmt.Fprintf(tw, format, s.Active, s.Pending, s.Scheduled, s.Retry, s.Archived)
+	fmt.Fprintf(tw, format, "active", "pending", "aggregating", "scheduled", "retry", "archived", "completed")
+	width := maxInt(9 /* defaultWidth */, maxWidthOf(s.Active, s.Pending, s.Aggregating, s.Scheduled, s.Retry, s.Archived, s.Completed)) // length of widest column
+	sep := strings.Repeat("-", width)
+	fmt.Fprintf(tw, format, sep, sep, sep, sep, sep, sep, sep)
+	fmt.Fprintf(tw, format, s.Active, s.Pending, s.Aggregating, s.Scheduled, s.Retry, s.Archived, s.Completed)
 	tw.Flush()
 }
 
+// numDigits returns the number of digits in n.
+func numDigits(n int) int {
+	return len(strconv.Itoa(n))
+}
+
+// maxWidthOf returns the max number of digits amount the provided vals.
+func maxWidthOf(vals ...int) int {
+	max := 0
+	for _, v := range vals {
+		if vw := numDigits(v); vw > max {
+			max = vw
+		}
+	}
+	return max
+}
+
+func maxInt(a, b int) int {
+	return int(math.Max(float64(a), float64(b)))
+}
+
 func printStatsByQueue(stats []*rdb.Stats) {
 	var headers, seps, counts []string
+	maxHeaderWidth := 0
 	for _, s := range stats {
 		title := queueTitle(s)
 		headers = append(headers, title)
-		seps = append(seps, strings.Repeat("-", len(title)))
+		if w := utf8.RuneCountInString(title); w > maxHeaderWidth {
+			maxHeaderWidth = w
+		}
 		counts = append(counts, strconv.Itoa(s.Size))
 	}
+	for i := 0; i < len(headers); i++ {
+		seps = append(seps, strings.Repeat("-", maxHeaderWidth))
+	}
 	format := strings.Repeat("%v\t", len(headers)) + "\n"
 	tw := new(tabwriter.Writer).Init(os.Stdout, 0, 8, 2, ' ', 0)
 	fmt.Fprintf(tw, format, toInterfaceSlice(headers)...)

tools/asynq/cmd/task.go

@@ -10,6 +10,7 @@ import (
 	"os"
 	"time"
 
+	"github.com/MakeNowJust/heredoc/v2"
 	"github.com/fatih/color"
 	"github.com/hibiken/asynq"
 	"github.com/spf13/cobra"
@@ -18,142 +19,194 @@ import (
 func init() {
 	rootCmd.AddCommand(taskCmd)
 	taskCmd.AddCommand(taskListCmd)
-	taskListCmd.Flags().StringP("queue", "q", "", "queue to inspect")
-	taskListCmd.Flags().StringP("state", "s", "", "state of the tasks to inspect")
+	taskListCmd.Flags().StringP("queue", "q", "", "queue to inspect (required)")
+	taskListCmd.Flags().StringP("state", "s", "", "state of the tasks; one of { active | pending | aggregating | scheduled | retry | archived | completed } (required)")
 	taskListCmd.Flags().Int("page", 1, "page number")
 	taskListCmd.Flags().Int("size", 30, "page size")
+	taskListCmd.Flags().StringP("group", "g", "", "group to inspect (required for listing aggregating tasks)")
 	taskListCmd.MarkFlagRequired("queue")
 	taskListCmd.MarkFlagRequired("state")
 
 	taskCmd.AddCommand(taskCancelCmd)
 
 	taskCmd.AddCommand(taskInspectCmd)
-	taskInspectCmd.Flags().StringP("queue", "q", "", "queue to which the task belongs")
-	taskInspectCmd.Flags().StringP("id", "i", "", "id of the task")
+	taskInspectCmd.Flags().StringP("queue", "q", "", "queue to which the task belongs (required)")
+	taskInspectCmd.Flags().StringP("id", "i", "", "id of the task (required)")
 	taskInspectCmd.MarkFlagRequired("queue")
 	taskInspectCmd.MarkFlagRequired("id")
 
 	taskCmd.AddCommand(taskArchiveCmd)
-	taskArchiveCmd.Flags().StringP("queue", "q", "", "queue to which the task belongs")
-	taskArchiveCmd.Flags().StringP("id", "i", "", "id of the task")
+	taskArchiveCmd.Flags().StringP("queue", "q", "", "queue to which the task belongs (required)")
+	taskArchiveCmd.Flags().StringP("id", "i", "", "id of the task (required)")
 	taskArchiveCmd.MarkFlagRequired("queue")
 	taskArchiveCmd.MarkFlagRequired("id")
 
 	taskCmd.AddCommand(taskDeleteCmd)
-	taskDeleteCmd.Flags().StringP("queue", "q", "", "queue to which the task belongs")
-	taskDeleteCmd.Flags().StringP("id", "i", "", "id of the task")
+	taskDeleteCmd.Flags().StringP("queue", "q", "", "queue to which the task belongs (required)")
+	taskDeleteCmd.Flags().StringP("id", "i", "", "id of the task (required)")
 	taskDeleteCmd.MarkFlagRequired("queue")
 	taskDeleteCmd.MarkFlagRequired("id")
 
 	taskCmd.AddCommand(taskRunCmd)
-	taskRunCmd.Flags().StringP("queue", "q", "", "queue to which the task belongs")
-	taskRunCmd.Flags().StringP("id", "i", "", "id of the task")
+	taskRunCmd.Flags().StringP("queue", "q", "", "queue to which the task belongs (required)")
+	taskRunCmd.Flags().StringP("id", "i", "", "id of the task (required)")
 	taskRunCmd.MarkFlagRequired("queue")
 	taskRunCmd.MarkFlagRequired("id")
 
+	taskCmd.AddCommand(taskEnqueueCmd)
+	taskEnqueueCmd.Flags().StringP("type_name", "t", "", "type name to enqueue the task as (required)")
+	taskEnqueueCmd.Flags().StringP("payload", "l", "", "payload to enqueue (required)")
+	// The following are the various OptionTypes; if not specified we won't pass them so that composeOptions()
+	// can apply its own defaults
+	taskEnqueueCmd.Flags().Int("retry", 0, "maximum retries")
+	taskEnqueueCmd.Flags().String("queue", "", "queue to enqueue the task to")
+	taskEnqueueCmd.Flags().String("id", "", "id to enqueue the task as")
+	taskEnqueueCmd.Flags().String("timeout", "", "timeout for the task (how long it can run); must be parseable as a time.Duration")
+	taskEnqueueCmd.Flags().String("deadline", "", "deadline for the task; must be in RFC3339 format")
+	taskEnqueueCmd.Flags().String("unique", "", "unique period for the task (duration within which it is guaranteed to be unique); must be parseable as a time.Duration")
+	taskEnqueueCmd.Flags().String("process_at", "", "process at time for the task; must be in RFC3339 format")
+	taskEnqueueCmd.Flags().String("process_in", "", "process in window for the task; must be parseable as a time.Duration")
+	taskEnqueueCmd.Flags().String("retention", "", "retention window for the task; must be parseable as a time.Duration")
+	taskEnqueueCmd.Flags().String("group", "", "group for the task")
+	taskEnqueueCmd.MarkFlagRequired("type_name")
+	taskEnqueueCmd.MarkFlagRequired("payload")
+
 	taskCmd.AddCommand(taskArchiveAllCmd)
-	taskArchiveAllCmd.Flags().StringP("queue", "q", "", "queue to which the tasks belong")
-	taskArchiveAllCmd.Flags().StringP("state", "s", "", "state of the tasks")
+	taskArchiveAllCmd.Flags().StringP("queue", "q", "", "queue to which the tasks belong (required)")
+	taskArchiveAllCmd.Flags().StringP("state", "s", "", "state of the tasks; one of { pending | aggregating | scheduled | retry } (required)")
 	taskArchiveAllCmd.MarkFlagRequired("queue")
 	taskArchiveAllCmd.MarkFlagRequired("state")
+	taskArchiveAllCmd.Flags().StringP("group", "g", "", "group to which the tasks belong (required for archiving aggregating tasks)")
 
 	taskCmd.AddCommand(taskDeleteAllCmd)
-	taskDeleteAllCmd.Flags().StringP("queue", "q", "", "queue to which the tasks belong")
-	taskDeleteAllCmd.Flags().StringP("state", "s", "", "state of the tasks")
+	taskDeleteAllCmd.Flags().StringP("queue", "q", "", "queue to which the tasks belong (required)")
+	taskDeleteAllCmd.Flags().StringP("state", "s", "", "state of the tasks; one of { pending | aggregating | scheduled | retry | archived | completed } (required)")
 	taskDeleteAllCmd.MarkFlagRequired("queue")
 	taskDeleteAllCmd.MarkFlagRequired("state")
+	taskDeleteAllCmd.Flags().StringP("group", "g", "", "group to which the tasks belong (required for deleting aggregating tasks)")
 
 	taskCmd.AddCommand(taskRunAllCmd)
-	taskRunAllCmd.Flags().StringP("queue", "q", "", "queue to which the tasks belong")
-	taskRunAllCmd.Flags().StringP("state", "s", "", "state of the tasks")
+	taskRunAllCmd.Flags().StringP("queue", "q", "", "queue to which the tasks belong (required)")
+	taskRunAllCmd.Flags().StringP("state", "s", "", "state of the tasks; one of { scheduled | retry | archived } (required)")
 	taskRunAllCmd.MarkFlagRequired("queue")
 	taskRunAllCmd.MarkFlagRequired("state")
+	taskRunAllCmd.Flags().StringP("group", "g", "", "group to which the tasks belong (required for running aggregating tasks)")
 }
 
 var taskCmd = &cobra.Command{
-	Use:   "task",
+	Use:   "task <command> [flags]",
 	Short: "Manage tasks",
+	Example: heredoc.Doc(`
+		$ asynq task list --queue=myqueue --state=scheduled
+		$ asynq task inspect --queue=myqueue --id=7837f142-6337-4217-9276-8f27281b67d1
+		$ asynq task delete --queue=myqueue --id=7837f142-6337-4217-9276-8f27281b67d1
+		$ asynq task deleteall --queue=myqueue --state=archived`),
 }
 
 var taskListCmd = &cobra.Command{
-	Use:   "ls --queue=QUEUE --state=STATE",
-	Short: "List tasks",
-	Long: `List tasks of the given state from the specified queue.
+	Use:     "list --queue=<queue> --state=<state> [flags]",
+	Aliases: []string{"ls"},
+	Short:   "List tasks",
+	Long: heredoc.Doc(`
+	List tasks of the given state from the specified queue.
 
-The value for the state flag should be one of:
-- active
-- pending
-- scheduled
-- retry
-- archived
+	The --queue and --state flags are required.
 
-List opeartion paginates the result set.
-By default, the command fetches the first 30 tasks.
-Use --page and --size flags to specify the page number and size.
+	Note: For aggregating tasks, additional --group flag is required.
 
-Example: 
-To list pending tasks from "default" queue, run
-  asynq task ls --queue=default --state=pending
-
-To list the tasks from the second page, run
-  asynq task ls --queue=default --state=pending --page=1`,
+	List opeartion paginates the result set. By default, the command fetches the first 30 tasks.
+	Use --page and --size flags to specify the page number and size.`),
+	Example: heredoc.Doc(`
+		$ asynq task list --queue=myqueue --state=pending
+		$ asynq task list --queue=myqueue --state=aggregating --group=mygroup
+		$ asynq task list --queue=myqueue --state=scheduled --page=2`),
 	Run: taskList,
 }
 
 var taskInspectCmd = &cobra.Command{
-	Use:   "inspect --queue=QUEUE --id=TASK_ID",
+	Use:   "inspect --queue=<queue> --id=<task_id>",
 	Short: "Display detailed information on the specified task",
 	Args:  cobra.NoArgs,
 	Run:   taskInspect,
+	Example: heredoc.Doc(`
+		$ asynq task inspect --queue=myqueue --id=f1720682-f5a6-4db1-8953-4f48ae541d0f`),
 }
 
 var taskCancelCmd = &cobra.Command{
-	Use:   "cancel TASK_ID [TASK_ID...]",
+	Use:   "cancel <task_id> [<task_id>...]",
 	Short: "Cancel one or more active tasks",
 	Args:  cobra.MinimumNArgs(1),
 	Run:   taskCancel,
+	Example: heredoc.Doc(`
+		$ asynq task cancel f1720682-f5a6-4db1-8953-4f48ae541d0f`),
 }
 
 var taskArchiveCmd = &cobra.Command{
-	Use:   "archive --queue=QUEUE --id=TASK_ID",
+	Use:   "archive --queue=<queue> --id=<task_id>",
 	Short: "Archive a task with the given id",
 	Args:  cobra.NoArgs,
 	Run:   taskArchive,
+	Example: heredoc.Doc(`
+		$ asynq task archive --queue=myqueue --id=f1720682-f5a6-4db1-8953-4f48ae541d0f`),
 }
 
 var taskDeleteCmd = &cobra.Command{
-	Use:   "delete --queue=QUEUE --id=TASK_ID",
-	Short: "Delete a task with the given id",
-	Args:  cobra.NoArgs,
-	Run:   taskDelete,
+	Use:     "delete --queue=<queue> --id=<task_id>",
+	Aliases: []string{"remove", "rm"},
+	Short:   "Delete a task with the given id",
+	Args:    cobra.NoArgs,
+	Run:     taskDelete,
+	Example: heredoc.Doc(`
+		$ asynq task delete --queue=myqueue --id=f1720682-f5a6-4db1-8953-4f48ae541d0f`),
 }
 
 var taskRunCmd = &cobra.Command{
-	Use:   "run --queue=QUEUE --id=TASK_ID",
+	Use:   "run --queue=<queue> --id=<task_id>",
 	Short: "Run a task with the given id",
 	Args:  cobra.NoArgs,
 	Run:   taskRun,
+	Example: heredoc.Doc(`
+		$ asynq task run --queue=myqueue --id=f1720682-f5a6-4db1-8953-4f48ae541d0f`),
+}
+
+var taskEnqueueCmd = &cobra.Command{
+	Use:   "enqueue --type_name=footype --payload=barpayload",
+	Short: "Enqueue a task",
+	Args:  cobra.NoArgs,
+	Run:   taskEnqueue,
+	Example: heredoc.Doc(`
+		$ asynq task enqueue -t footype -l barpayload
+		$ asynq task enqueue -t footask -l barpayload --retry 3 --id f1720682-f5a6-4db1-8953-4f48ae541d0f --queue bazqueue --timeout 100s --deadline 2024-12-14T01:23:45Z --unique 100s --process_at 2024-12-14T01:22:05Z --process_in 100s --retention 5h --group baygroup`),
 }
 
 var taskArchiveAllCmd = &cobra.Command{
-	Use:   "archiveall --queue=QUEUE --state=STATE",
+	Use:   "archiveall --queue=<queue> --state=<state>",
 	Short: "Archive all tasks in the given state",
 	Args:  cobra.NoArgs,
 	Run:   taskArchiveAll,
+	Example: heredoc.Doc(`
+		$ asynq task archiveall --queue=myqueue --state=retry
+		$ asynq task archiveall --queue=myqueue --state=aggregating --group=mygroup`),
 }
 
 var taskDeleteAllCmd = &cobra.Command{
-	Use:   "deleteall --queue=QUEUE --state=STATE",
+	Use:   "deleteall --queue=<queue> --state=<state>",
 	Short: "Delete all tasks in the given state",
 	Args:  cobra.NoArgs,
 	Run:   taskDeleteAll,
+	Example: heredoc.Doc(`
+		$ asynq task deleteall --queue=myqueue --state=archived
+		$ asynq task deleteall --queue=myqueue --state=aggregating --group=mygroup`),
 }
 
 var taskRunAllCmd = &cobra.Command{
-	Use:   "runall --queue=QUEUE --state=STATE",
+	Use:   "runall --queue=<queue> --state=<state>",
 	Short: "Run all tasks in the given state",
 	Args:  cobra.NoArgs,
 	Run:   taskRunAll,
+	Example: heredoc.Doc(`
+		$ asynq task runall --queue=myqueue --state=retry
+		$ asynq task runall --queue=myqueue --state=aggregating --group=mygroup`),
 }
 
 func taskList(cmd *cobra.Command, args []string) {
@@ -189,6 +242,19 @@ func taskList(cmd *cobra.Command, args []string) {
 		listRetryTasks(qname, pageNum, pageSize)
 	case "archived":
 		listArchivedTasks(qname, pageNum, pageSize)
+	case "completed":
+		listCompletedTasks(qname, pageNum, pageSize)
+	case "aggregating":
+		group, err := cmd.Flags().GetString("group")
+		if err != nil {
+			fmt.Println(err)
+			os.Exit(1)
+		}
+		if group == "" {
+			fmt.Println("Flag --group is required for listing aggregating tasks")
+			os.Exit(1)
+		}
+		listAggregatingTasks(qname, group, pageNum, pageSize)
 	default:
 		fmt.Printf("error: state=%q is not supported\n", state)
 		os.Exit(1)
@@ -210,7 +276,7 @@ func listActiveTasks(qname string, pageNum, pageSize int) {
 		[]string{"ID", "Type", "Payload"},
 		func(w io.Writer, tmpl string) {
 			for _, t := range tasks {
-				fmt.Fprintf(w, tmpl, t.ID, t.Type, formatPayload(t.Payload))
+				fmt.Fprintf(w, tmpl, t.ID, t.Type, sprintBytes(t.Payload))
 			}
 		},
 	)
@@ -231,7 +297,7 @@ func listPendingTasks(qname string, pageNum, pageSize int) {
 		[]string{"ID", "Type", "Payload"},
 		func(w io.Writer, tmpl string) {
 			for _, t := range tasks {
-				fmt.Fprintf(w, tmpl, t.ID, t.Type, formatPayload(t.Payload))
+				fmt.Fprintf(w, tmpl, t.ID, t.Type, sprintBytes(t.Payload))
 			}
 		},
 	)
@@ -252,7 +318,7 @@ func listScheduledTasks(qname string, pageNum, pageSize int) {
 		[]string{"ID", "Type", "Payload", "Process In"},
 		func(w io.Writer, tmpl string) {
 			for _, t := range tasks {
-				fmt.Fprintf(w, tmpl, t.ID, t.Type, formatPayload(t.Payload), formatProcessAt(t.NextProcessAt))
+				fmt.Fprintf(w, tmpl, t.ID, t.Type, sprintBytes(t.Payload), formatProcessAt(t.NextProcessAt))
 			}
 		},
 	)
@@ -284,8 +350,8 @@ func listRetryTasks(qname string, pageNum, pageSize int) {
 		[]string{"ID", "Type", "Payload", "Next Retry", "Last Error", "Last Failed", "Retried", "Max Retry"},
 		func(w io.Writer, tmpl string) {
 			for _, t := range tasks {
-				fmt.Fprintf(w, tmpl, t.ID, t.Type, formatPayload(t.Payload), formatProcessAt(t.NextProcessAt),
-					t.LastErr, formatLastFailedAt(t.LastFailedAt), t.Retried, t.MaxRetry)
+				fmt.Fprintf(w, tmpl, t.ID, t.Type, sprintBytes(t.Payload), formatProcessAt(t.NextProcessAt),
+					t.LastErr, formatPastTime(t.LastFailedAt), t.Retried, t.MaxRetry)
 			}
 		},
 	)
@@ -306,11 +372,52 @@ func listArchivedTasks(qname string, pageNum, pageSize int) {
 		[]string{"ID", "Type", "Payload", "Last Failed", "Last Error"},
 		func(w io.Writer, tmpl string) {
 			for _, t := range tasks {
-				fmt.Fprintf(w, tmpl, t.ID, t.Type, formatPayload(t.Payload), formatLastFailedAt(t.LastFailedAt), t.LastErr)
+				fmt.Fprintf(w, tmpl, t.ID, t.Type, sprintBytes(t.Payload), formatPastTime(t.LastFailedAt), t.LastErr)
 			}
 		})
 }
 
+func listCompletedTasks(qname string, pageNum, pageSize int) {
+	i := createInspector()
+	tasks, err := i.ListCompletedTasks(qname, asynq.PageSize(pageSize), asynq.Page(pageNum))
+	if err != nil {
+		fmt.Println(err)
+		os.Exit(1)
+	}
+	if len(tasks) == 0 {
+		fmt.Printf("No completed tasks in %q queue\n", qname)
+		return
+	}
+	printTable(
+		[]string{"ID", "Type", "Payload", "CompletedAt", "Result"},
+		func(w io.Writer, tmpl string) {
+			for _, t := range tasks {
+				fmt.Fprintf(w, tmpl, t.ID, t.Type, sprintBytes(t.Payload), formatPastTime(t.CompletedAt), sprintBytes(t.Result))
+			}
+		})
+}
+
+func listAggregatingTasks(qname, group string, pageNum, pageSize int) {
+	i := createInspector()
+	tasks, err := i.ListAggregatingTasks(qname, group, asynq.PageSize(pageSize), asynq.Page(pageNum))
+	if err != nil {
+		fmt.Println(err)
+		os.Exit(1)
+	}
+	if len(tasks) == 0 {
+		fmt.Printf("No aggregating tasks in group %q \n", group)
+		return
+	}
+	printTable(
+		[]string{"ID", "Type", "Payload", "Group"},
+		func(w io.Writer, tmpl string) {
+			for _, t := range tasks {
+				fmt.Fprintf(w, tmpl, t.ID, t.Type, sprintBytes(t.Payload), t.Group)
+			}
+		},
+	)
+}
+
 func taskCancel(cmd *cobra.Command, args []string) {
 	i := createInspector()
 	for _, id := range args {
@@ -356,7 +463,7 @@ func printTaskInfo(info *asynq.TaskInfo) {
 	if len(info.LastErr) != 0 {
 		fmt.Println()
 		bold.Println("Last Failure")
-		fmt.Printf("Failed at:     %s\n", formatLastFailedAt(info.LastFailedAt))
+		fmt.Printf("Failed at:     %s\n", formatPastTime(info.LastFailedAt))
 		fmt.Printf("Error message: %s\n", info.LastErr)
 	}
 }
@@ -371,11 +478,12 @@ func formatNextProcessAt(processAt time.Time) string {
 	return fmt.Sprintf("%s (in %v)", processAt.Format(time.UnixDate), processAt.Sub(time.Now()).Round(time.Second))
 }
 
-func formatLastFailedAt(lastFailedAt time.Time) string {
-	if lastFailedAt.IsZero() || lastFailedAt.Unix() == 0 {
+// formatPastTime takes t which is time in the past and returns a user-friendly string.
+func formatPastTime(t time.Time) string {
+	if t.IsZero() || t.Unix() == 0 {
 		return ""
 	}
-	return lastFailedAt.Format(time.UnixDate)
+	return t.Format(time.UnixDate)
 }
 
 func taskArchive(cmd *cobra.Command, args []string) {
@@ -441,6 +549,95 @@ func taskRun(cmd *cobra.Command, args []string) {
 	fmt.Println("task is now pending")
 }
 
+func taskEnqueue(cmd *cobra.Command, args []string) {
+	typeName, err := cmd.Flags().GetString("type_name")
+	if err != nil {
+		fmt.Printf("error: %v\n", err)
+		os.Exit(1)
+	}
+
+	payload, err := cmd.Flags().GetString("payload")
+	if err != nil {
+		fmt.Printf("error: %v\n", err)
+		os.Exit(1)
+	}
+
+	// For all of the optional flags, we need to explicitly check whether they were set or
+	// not; for consistency we want to use the defaults set in composeOptions() rather than
+	// the ones in the flag definitions.
+	opts := []asynq.Option{}
+	if cmd.Flags().Changed("retry") {
+		retry, err := cmd.Flags().GetInt("retry")
+		if err != nil {
+			fmt.Printf("error: %v\n", err)
+			os.Exit(1)
+		}
+		opts = append(opts, asynq.MaxRetry(retry))
+	}
+
+	if cmd.Flags().Changed("queue") {
+		queue, err := cmd.Flags().GetString("queue")
+		if err != nil {
+			fmt.Printf("error: %v\n", err)
+			os.Exit(1)
+		}
+		opts = append(opts, asynq.Queue(queue))
+	}
+
+	if cmd.Flags().Changed("id") {
+		id, err := cmd.Flags().GetString("id")
+		if err != nil {
+			fmt.Printf("error: %v\n", err)
+			os.Exit(1)
+		}
+		opts = append(opts, asynq.TaskID(id))
+	}
+
+	if cmd.Flags().Changed("timeout") {
+		opts = append(opts, asynq.Timeout(getDuration(cmd, "timeout")))
+	}
+
+	if cmd.Flags().Changed("deadline") {
+		opts = append(opts, asynq.Deadline(getTime(cmd, "deadline")))
+	}
+
+	if cmd.Flags().Changed("unique") {
+		opts = append(opts, asynq.Unique(getDuration(cmd, "unique")))
+	}
+
+	if cmd.Flags().Changed("process_at") {
+		opts = append(opts, asynq.ProcessAt(getTime(cmd, "process_at")))
+	}
+
+	if cmd.Flags().Changed("process_in") {
+		opts = append(opts, asynq.ProcessIn(getDuration(cmd, "process_in")))
+	}
+
+	if cmd.Flags().Changed("retention") {
+		opts = append(opts, asynq.Retention(getDuration(cmd, "retention")))
+	}
+
+	if cmd.Flags().Changed("group") {
+		group, err := cmd.Flags().GetString("group")
+		if err != nil {
+			fmt.Printf("error: %v\n", err)
+			os.Exit(1)
+		}
+		opts = append(opts, asynq.Group(group))
+	}
+
+	c := createClient()
+	task := asynq.NewTask(typeName, []byte(payload), opts...)
+
+	taskInfo, err := c.Enqueue(task)
+	if err != nil {
+		fmt.Printf("error: %v\n", err)
+		os.Exit(1)
+	}
+
+	fmt.Printf("Enqueued task %s to queue %s\n", taskInfo.ID, taskInfo.Queue)
+}
+
 func taskArchiveAll(cmd *cobra.Command, args []string) {
 	qname, err := cmd.Flags().GetString("queue")
 	if err != nil {
@@ -462,6 +659,17 @@ func taskArchiveAll(cmd *cobra.Command, args []string) {
 		n, err = i.ArchiveAllScheduledTasks(qname)
 	case "retry":
 		n, err = i.ArchiveAllRetryTasks(qname)
+	case "aggregating":
+		group, err := cmd.Flags().GetString("group")
+		if err != nil {
+			fmt.Printf("error: %v\n", err)
+			os.Exit(1)
+		}
+		if group == "" {
+			fmt.Println("error: Flag --group is required for aggregating tasks")
+			os.Exit(1)
+		}
+		n, err = i.ArchiveAllAggregatingTasks(qname, group)
 	default:
 		fmt.Printf("error: unsupported state %q\n", state)
 		os.Exit(1)
@@ -496,6 +704,19 @@ func taskDeleteAll(cmd *cobra.Command, args []string) {
 		n, err = i.DeleteAllRetryTasks(qname)
 	case "archived":
 		n, err = i.DeleteAllArchivedTasks(qname)
+	case "completed":
+		n, err = i.DeleteAllCompletedTasks(qname)
+	case "aggregating":
+		group, err := cmd.Flags().GetString("group")
+		if err != nil {
+			fmt.Printf("error: %v\n", err)
+			os.Exit(1)
+		}
+		if group == "" {
+			fmt.Println("error: Flag --group is required for aggregating tasks")
+			os.Exit(1)
+		}
+		n, err = i.DeleteAllAggregatingTasks(qname, group)
 	default:
 		fmt.Printf("error: unsupported state %q\n", state)
 		os.Exit(1)
@@ -528,6 +749,17 @@ func taskRunAll(cmd *cobra.Command, args []string) {
 		n, err = i.RunAllRetryTasks(qname)
 	case "archived":
 		n, err = i.RunAllArchivedTasks(qname)
+	case "aggregating":
+		group, err := cmd.Flags().GetString("group")
+		if err != nil {
+			fmt.Printf("error: %v\n", err)
+			os.Exit(1)
+		}
+		if group == "" {
+			fmt.Println("error: Flag --group is required for aggregating tasks")
+			os.Exit(1)
+		}
+		n, err = i.RunAllAggregatingTasks(qname, group)
 	default:
 		fmt.Printf("error: unsupported state %q\n", state)
 		os.Exit(1)
@@ -538,3 +770,4 @@ func taskRunAll(cmd *cobra.Command, args []string) {
 	}
 	fmt.Printf("%d tasks are now pending\n", n)
 }
+

tools/go.mod

@@ -1,23 +1,55 @@
 module github.com/hibiken/asynq/tools
 
-go 1.13
+go 1.22
 
 require (
-	github.com/armon/consul-api v0.0.0-20180202201655-eb2c6b5be1b6 // indirect
-	github.com/coreos/go-etcd v2.0.0+incompatible // indirect
-	github.com/cpuguy83/go-md2man v1.0.10 // indirect
-	github.com/fatih/color v1.9.0
-	github.com/go-redis/redis/v7 v7.4.0
-	github.com/golang/protobuf v1.4.1 // indirect
-	github.com/google/uuid v1.2.0
-	github.com/hibiken/asynq v0.17.1
+	github.com/MakeNowJust/heredoc/v2 v2.0.1
+	github.com/fatih/color v1.18.0
+	github.com/gdamore/tcell/v2 v2.5.1
+	github.com/google/go-cmp v0.6.0
+	github.com/hibiken/asynq v0.25.0
+	github.com/hibiken/asynq/x v0.0.0-20220131170841-349f4c50fb1d
+	github.com/mattn/go-runewidth v0.0.16
 	github.com/mitchellh/go-homedir v1.1.0
-	github.com/spf13/cast v1.3.1
+	github.com/prometheus/client_golang v1.11.1
+	github.com/redis/go-redis/v9 v9.7.0
 	github.com/spf13/cobra v1.1.1
+	github.com/spf13/pflag v1.0.5
 	github.com/spf13/viper v1.7.0
-	github.com/ugorji/go v1.1.4 // indirect
-	github.com/ugorji/go/codec v0.0.0-20181204163529-d75b2dcb6bc8 // indirect
-	github.com/xordataexchange/crypt v0.0.3-0.20170626215501-b2862e3d0a77 // indirect
+	golang.org/x/exp v0.0.0-20191030013958-a1ab85dbe136
 )
 
-replace github.com/hibiken/asynq => ./..
+require (
+	github.com/beorn7/perks v1.0.1 // indirect
+	github.com/cespare/xxhash/v2 v2.2.0 // indirect
+	github.com/dgryski/go-rendezvous v0.0.0-20200823014737-9f7001d12a5f // indirect
+	github.com/fsnotify/fsnotify v1.4.9 // indirect
+	github.com/gdamore/encoding v1.0.0 // indirect
+	github.com/golang/protobuf v1.5.3 // indirect
+	github.com/google/uuid v1.6.0 // indirect
+	github.com/hashicorp/hcl v1.0.0 // indirect
+	github.com/inconshreveable/mousetrap v1.0.0 // indirect
+	github.com/lucasb-eyer/go-colorful v1.2.0 // indirect
+	github.com/magiconair/properties v1.8.1 // indirect
+	github.com/mattn/go-colorable v0.1.13 // indirect
+	github.com/mattn/go-isatty v0.0.20 // indirect
+	github.com/matttproud/golang_protobuf_extensions v1.0.1 // indirect
+	github.com/mitchellh/mapstructure v1.1.2 // indirect
+	github.com/pelletier/go-toml v1.2.0 // indirect
+	github.com/prometheus/client_model v0.2.0 // indirect
+	github.com/prometheus/common v0.26.0 // indirect
+	github.com/prometheus/procfs v0.6.0 // indirect
+	github.com/rivo/uniseg v0.2.0 // indirect
+	github.com/robfig/cron/v3 v3.0.1 // indirect
+	github.com/spf13/afero v1.1.2 // indirect
+	github.com/spf13/cast v1.7.0 // indirect
+	github.com/spf13/jwalterweatherman v1.0.0 // indirect
+	github.com/subosito/gotenv v1.2.0 // indirect
+	golang.org/x/sys v0.26.0 // indirect
+	golang.org/x/term v0.0.0-20201210144234-2321bbc49cbf // indirect
+	golang.org/x/text v0.3.8 // indirect
+	golang.org/x/time v0.7.0 // indirect
+	google.golang.org/protobuf v1.35.1 // indirect
+	gopkg.in/ini.v1 v1.51.0 // indirect
+	gopkg.in/yaml.v2 v2.4.0 // indirect
+)

tools/go.sum

@@ -14,52 +14,73 @@ dmitri.shuralyov.com/gpu/mtl v0.0.0-20190408044501-666a987793e9/go.mod h1:H6x//7
 github.com/BurntSushi/toml v0.3.1 h1:WXkYYl6Yr3qBf1K79EBnL4mak0OimBfB0XUf9Vl28OQ=
 github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
 github.com/BurntSushi/xgb v0.0.0-20160522181843-27f122750802/go.mod h1:IVnqGOEym/WlBOVXweHU+Q+/VP0lqqI8lqeDx9IjBqo=
+github.com/MakeNowJust/heredoc/v2 v2.0.1 h1:rlCHh70XXXv7toz95ajQWOWQnN4WNLt0TdpZYIR/J6A=
+github.com/MakeNowJust/heredoc/v2 v2.0.1/go.mod h1:6/2Abh5s+hc3g9nbWLe9ObDIOhaRrqsyY9MWy+4JdRM=
 github.com/OneOfOne/xxhash v1.2.2/go.mod h1:HSdplMjZKSmBqAxg5vPj2TmRDmfkzw+cTzAElWljhcU=
 github.com/alecthomas/template v0.0.0-20160405071501-a0175ee3bccc/go.mod h1:LOuyumcjzFXgccqObfd/Ljyb9UuFJ6TxHnclSeseNhc=
+github.com/alecthomas/template v0.0.0-20190718012654-fb15b899a751/go.mod h1:LOuyumcjzFXgccqObfd/Ljyb9UuFJ6TxHnclSeseNhc=
 github.com/alecthomas/units v0.0.0-20151022065526-2efee857e7cf/go.mod h1:ybxpYRFXyAe+OPACYpWeL0wqObRcbAqCMya13uyzqw0=
+github.com/alecthomas/units v0.0.0-20190717042225-c3de453c63f4/go.mod h1:ybxpYRFXyAe+OPACYpWeL0wqObRcbAqCMya13uyzqw0=
+github.com/alecthomas/units v0.0.0-20190924025748-f65c72e2690d/go.mod h1:rBZYJk541a8SKzHPHnH3zbiI+7dagKZ0cgpgrD7Fyho=
 github.com/armon/circbuf v0.0.0-20150827004946-bbbad097214e/go.mod h1:3U/XgcO3hCbHZ8TKRvWD2dDTCfh9M9ya+I9JpbB7O8o=
-github.com/armon/consul-api v0.0.0-20180202201655-eb2c6b5be1b6/go.mod h1:grANhF5doyWs3UAsr3K4I6qtAmlQcZDesFNEHPZAzj8=
 github.com/armon/go-metrics v0.0.0-20180917152333-f0300d1749da/go.mod h1:Q73ZrmVTwzkszR9V5SSuryQ31EELlFMUz1kKyl939pY=
 github.com/armon/go-radix v0.0.0-20180808171621-7fddfc383310/go.mod h1:ufUuZ+zHj4x4TnLV4JWEpy2hxWSpsRywHrMgIH9cCH8=
 github.com/beorn7/perks v0.0.0-20180321164747-3a771d992973/go.mod h1:Dwedo/Wpr24TaqPxmxbtue+5NUziq4I4S80YR8gNf3Q=
 github.com/beorn7/perks v1.0.0/go.mod h1:KWe93zE9D1o94FZ5RNwFwVgaQK1VOXiVxmqh+CedLV8=
+github.com/beorn7/perks v1.0.1 h1:VlbKKnNfV8bJzeqoa4cOKqO6bYr3WgKZxO8Z16+hsOM=
+github.com/beorn7/perks v1.0.1/go.mod h1:G2ZrVWU2WbWT9wwq4/hrbKbnv/1ERSJQ0ibhJ6rlkpw=
 github.com/bgentry/speakeasy v0.1.0/go.mod h1:+zsyZBPWlz7T6j88CTgSN5bM796AkVf0kBD4zp0CCIs=
 github.com/bketelsen/crypt v0.0.3-0.20200106085610-5cbc8cc4026c/go.mod h1:MKsuJmJgSg28kpZDP6UIiPt0e0Oz0kqKNGyRaWEPv84=
+github.com/bsm/ginkgo/v2 v2.12.0 h1:Ny8MWAHyOepLGlLKYmXG4IEkioBysk6GpaRTLC8zwWs=
+github.com/bsm/ginkgo/v2 v2.12.0/go.mod h1:SwYbGRRDovPVboqFv0tPTcG1sN61LM1Z4ARdbAV9g4c=
+github.com/bsm/gomega v1.27.10 h1:yeMWxP2pV2fG3FgAODIY8EiRE3dy0aeFYt4l7wh6yKA=
+github.com/bsm/gomega v1.27.10/go.mod h1:JyEr/xRbxbtgWNi8tIEVPUYZ5Dzef52k01W3YH0H+O0=
 github.com/census-instrumentation/opencensus-proto v0.2.1/go.mod h1:f6KPmirojxKA12rnyqOA5BBL4O983OfeGPqjHWSTneU=
 github.com/cespare/xxhash v1.1.0/go.mod h1:XrSqR1VqqWfGrhpAt58auRo0WTKS1nRRg3ghfAqPWnc=
+github.com/cespare/xxhash/v2 v2.1.1/go.mod h1:VGX0DQ3Q6kWi7AoAeZDth3/j3BFtOZR5XLFGgcrjCOs=
+github.com/cespare/xxhash/v2 v2.1.2/go.mod h1:VGX0DQ3Q6kWi7AoAeZDth3/j3BFtOZR5XLFGgcrjCOs=
+github.com/cespare/xxhash/v2 v2.2.0 h1:DC2CZ1Ep5Y4k3ZQ899DldepgrayRUGE6BBZ/cd9Cj44=
+github.com/cespare/xxhash/v2 v2.2.0/go.mod h1:VGX0DQ3Q6kWi7AoAeZDth3/j3BFtOZR5XLFGgcrjCOs=
 github.com/client9/misspell v0.3.4/go.mod h1:qj6jICC3Q7zFZvVWo7KLAzC3yx5G7kyvSDkc90ppPyw=
 github.com/coreos/bbolt v1.3.2/go.mod h1:iRUV2dpdMOn7Bo10OQBFzIJO9kkE559Wcmn+qkEiiKk=
-github.com/coreos/etcd v3.3.10+incompatible/go.mod h1:uF7uidLiAD3TWHmW31ZFd/JWoc32PjwdhPthX9715RE=
 github.com/coreos/etcd v3.3.13+incompatible/go.mod h1:uF7uidLiAD3TWHmW31ZFd/JWoc32PjwdhPthX9715RE=
-github.com/coreos/go-etcd v2.0.0+incompatible/go.mod h1:Jez6KQU2B/sWsbdaef3ED8NzMklzPG4d5KIOhIy30Tk=
-github.com/coreos/go-semver v0.2.0/go.mod h1:nnelYz7RCh+5ahJtPPxZlU+153eP4D4r3EedlOD2RNk=
 github.com/coreos/go-semver v0.3.0/go.mod h1:nnelYz7RCh+5ahJtPPxZlU+153eP4D4r3EedlOD2RNk=
 github.com/coreos/go-systemd v0.0.0-20190321100706-95778dfbb74e/go.mod h1:F5haX7vjVVG0kc13fIWeqUViNPyEJxv/OmvnBo0Yme4=
 github.com/coreos/pkg v0.0.0-20180928190104-399ea9e2e55f/go.mod h1:E3G3o1h8I7cfcXa63jLwjI0eiQQMgzzUDFVpN/nH/eA=
-github.com/cpuguy83/go-md2man v1.0.10/go.mod h1:SmD6nW6nTyfqj6ABTjUi3V3JVMnlJmwcJI5acqYI6dE=
 github.com/cpuguy83/go-md2man/v2 v2.0.0/go.mod h1:maD7wRr/U5Z6m/iR4s+kqSMx2CaBsrgA7czyZG/E6dU=
 github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/dgrijalva/jwt-go v3.2.0+incompatible/go.mod h1:E3ru+11k8xSBh+hMPgOLZmtrrCbhqsmaPHjLKYnJCaQ=
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+github.com/dgryski/go-rendezvous v0.0.0-20200823014737-9f7001d12a5f/go.mod h1:cuUVRXasLTGF7a8hSLbxyZXjz+1KgoB3wDUb6vlszIc=
 github.com/dgryski/go-sip13 v0.0.0-20181026042036-e10d5fee7954/go.mod h1:vAd38F8PWV+bWy6jNmig1y/TA+kYO4g3RSRF0IAv0no=
 github.com/envoyproxy/go-control-plane v0.9.1-0.20191026205805-5f8ba28d4473/go.mod h1:YTl/9mNaCwkRvm6d1a2C3ymFceY/DCBVvsKhRF0iEA4=
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-github.com/fatih/color v1.9.0 h1:8xPHl4/q1VyqGIPif1F+1V3Y3lSmrq01EabUW3CoW5s=
-github.com/fatih/color v1.9.0/go.mod h1:eQcE1qtQxscV5RaZvpXrrb8Drkc3/DdQ+uUYCNjL+zU=
-github.com/fsnotify/fsnotify v1.4.7 h1:IXs+QLmnXW2CcXuY+8Mzv/fWEsPGWxqefPtCP5CnV9I=
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+github.com/go-kit/log v0.1.0/go.mod h1:zbhenjAZHb184qTLMA9ZjW7ThYL0H2mk7Q6pNt4vbaY=
 github.com/go-logfmt/logfmt v0.3.0/go.mod h1:Qt1PoO58o5twSAckw1HlFXLmHsOX5/0LbT9GBnD5lWE=
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-github.com/go-redis/redis/v7 v7.2.0 h1:CrCexy/jYWZjW0AyVoHlcJUeZN19VWlbepTh1Vq6dJs=
-github.com/go-redis/redis/v7 v7.2.0/go.mod h1:JDNMw23GTyLNC4GZu9njt15ctBQVn7xjRfnwdHj/Dcg=
-github.com/go-redis/redis/v7 v7.4.0 h1:7obg6wUoj05T0EpY0o8B59S9w5yeMWql7sw2kwNW1x4=
-github.com/go-redis/redis/v7 v7.4.0/go.mod h1:JDNMw23GTyLNC4GZu9njt15ctBQVn7xjRfnwdHj/Dcg=
+github.com/go-logfmt/logfmt v0.5.0/go.mod h1:wCYkCAKZfumFQihp8CzCvQ3paCTfi41vtzG1KdI/P7A=
+github.com/go-redis/redis/v8 v8.11.2/go.mod h1:DLomh7y2e3ggQXQLd1YgmvIfecPJoFl7WU5SOQ/r06M=
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@@ -274,6 +347,7 @@ golang.org/x/mobile v0.0.0-20190312151609-d3739f865fa6/go.mod h1:z+o9i4GpDbdi3rU
 golang.org/x/mobile v0.0.0-20190719004257-d2bd2a29d028/go.mod h1:E/iHnbuqvinMTCcRqshq8CkpyQDoeVncDDYHnLhea+o=
 golang.org/x/mod v0.0.0-20190513183733-4bf6d317e70e/go.mod h1:mXi4GBBbnImb6dmsKGUJ2LatrhH/nqhxcFungHvyanc=
 golang.org/x/mod v0.1.0/go.mod h1:0QHyrYULN0/3qlju5TqG8bIK38QM8yzMo5ekMj3DlcY=
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 golang.org/x/net v0.0.0-20180724234803-3673e40ba225/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
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@@ -287,11 +361,14 @@ golang.org/x/net v0.0.0-20190311183353-d8887717615a/go.mod h1:t9HGtf8HONx5eT2rtn
 golang.org/x/net v0.0.0-20190404232315-eb5bcb51f2a3/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
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 golang.org/x/oauth2 v0.0.0-20180821212333-d2e6202438be/go.mod h1:N/0e6XlmueqKjAGxoOufVs8QHGRruUQn6yWY3a++T0U=
 golang.org/x/oauth2 v0.0.0-20190226205417-e64efc72b421/go.mod h1:gOpvHmFTYa4IltrdGE7lF6nIHvwfUNPOp7c8zoXwtLw=
 golang.org/x/oauth2 v0.0.0-20190604053449-0f29369cfe45/go.mod h1:gOpvHmFTYa4IltrdGE7lF6nIHvwfUNPOp7c8zoXwtLw=
@@ -300,6 +377,9 @@ golang.org/x/sync v0.0.0-20181108010431-42b317875d0f/go.mod h1:RxMgew5VJxzue5/jJ
 golang.org/x/sync v0.0.0-20181221193216-37e7f081c4d4/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
 golang.org/x/sync v0.0.0-20190227155943-e225da77a7e6/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
 golang.org/x/sync v0.0.0-20190423024810-112230192c58/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
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 golang.org/x/sys v0.0.0-20180823144017-11551d06cbcc/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
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@@ -307,26 +387,47 @@ golang.org/x/sys v0.0.0-20180909124046-d0be0721c37e/go.mod h1:STP8DvDyc/dI5b8T5h
 golang.org/x/sys v0.0.0-20181026203630-95b1ffbd15a5/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
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@@ -345,9 +446,12 @@ golang.org/x/tools v0.0.0-20190816200558-6889da9d5479/go.mod h1:b+2E5dAYhXwXZwtn
 golang.org/x/tools v0.0.0-20190911174233-4f2ddba30aff/go.mod h1:b+2E5dAYhXwXZwtnZ6UAqBI28+e2cm9otk0dWdXHAEo=
 golang.org/x/tools v0.0.0-20191012152004-8de300cfc20a/go.mod h1:b+2E5dAYhXwXZwtnZ6UAqBI28+e2cm9otk0dWdXHAEo=
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 google.golang.org/api v0.8.0/go.mod h1:o4eAsZoiT+ibD93RtjEohWalFOjRDx6CVaqeizhEnKg=
@@ -369,7 +473,6 @@ google.golang.org/genproto v0.0.0-20191108220845-16a3f7862a1a/go.mod h1:n3cpQtvx
 google.golang.org/genproto v0.0.0-20200526211855-cb27e3aa2013/go.mod h1:NbSheEEYHJ7i3ixzK3sjbqSGDJWnxyFXZblF3eUsNvo=
 google.golang.org/grpc v1.19.0/go.mod h1:mqu4LbDTu4XGKhr4mRzUsmM4RtVoemTSY81AxZiDr8c=
 google.golang.org/grpc v1.20.1/go.mod h1:10oTOabMzJvdu6/UiuZezV6QK5dSlG84ov/aaiqXj38=
-google.golang.org/grpc v1.21.0/go.mod h1:oYelfM1adQP15Ek0mdvEgi9Df8B9CZIaU1084ijfRaM=
 google.golang.org/grpc v1.21.1/go.mod h1:oYelfM1adQP15Ek0mdvEgi9Df8B9CZIaU1084ijfRaM=
 google.golang.org/grpc v1.23.0/go.mod h1:Y5yQAOtifL1yxbo5wqy6BxZv8vAUGQwXBOALyacEbxg=
 google.golang.org/grpc v1.27.0/go.mod h1:qbnxyOmOxrQa7FizSgH+ReBfzJrCY1pSN7KXBS8abTk=
@@ -379,30 +482,35 @@ google.golang.org/protobuf v0.0.0-20200228230310-ab0ca4ff8a60/go.mod h1:cfTl7dwQ
 google.golang.org/protobuf v1.20.1-0.20200309200217-e05f789c0967/go.mod h1:A+miEFZTKqfCUM6K7xSMQL9OKL/b6hQv+e19PK+JZNE=
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 google.golang.org/protobuf v1.22.0/go.mod h1:EGpADcykh3NcUnDUJcl1+ZksZNG86OlYog2l/sGQquU=
+google.golang.org/protobuf v1.23.0/go.mod h1:EGpADcykh3NcUnDUJcl1+ZksZNG86OlYog2l/sGQquU=
 google.golang.org/protobuf v1.23.1-0.20200526195155-81db48ad09cc/go.mod h1:EGpADcykh3NcUnDUJcl1+ZksZNG86OlYog2l/sGQquU=
-google.golang.org/protobuf v1.25.0 h1:Ejskq+SyPohKW+1uil0JJMtmHCgJPJ/qWTxr8qp+R4c=
 google.golang.org/protobuf v1.25.0/go.mod h1:9JNX74DMeImyA3h4bdi1ymwjUzf21/xIlbajtzgsN7c=
+google.golang.org/protobuf v1.26.0-rc.1/go.mod h1:jlhhOSvTdKEhbULTjvd4ARK9grFBp09yW+WbY/TyQbw=
+google.golang.org/protobuf v1.26.0/go.mod h1:9q0QmTI4eRPtz6boOQmLYwt+qCgq0jsYwAQnmE0givc=
+google.golang.org/protobuf v1.35.1 h1:m3LfL6/Ca+fqnjnlqQXNpFPABW1UD7mjh8KO2mKFytA=
+google.golang.org/protobuf v1.35.1/go.mod h1:9fA7Ob0pmnwhb644+1+CVWFRbNajQ6iRojtC/QF5bRE=
 gopkg.in/alecthomas/kingpin.v2 v2.2.6/go.mod h1:FMv+mEhP44yOT+4EoQTLFTRgOQ1FBLkstjWtayDeSgw=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/check.v1 v1.0.0-20190902080502-41f04d3bba15 h1:YR8cESwS4TdDjEe65xsg0ogRM/Nc3DYOhEAlW+xobZo=
 gopkg.in/check.v1 v1.0.0-20190902080502-41f04d3bba15/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/errgo.v2 v2.1.0/go.mod h1:hNsd1EY+bozCKY1Ytp96fpM3vjJbqLJn88ws8XvfDNI=
-gopkg.in/fsnotify.v1 v1.4.7 h1:xOHLXZwVvI9hhs+cLKq5+I5onOuwQLhQwiu63xxlHs4=
 gopkg.in/fsnotify.v1 v1.4.7/go.mod h1:Tz8NjZHkW78fSQdbUxIjBTcgA1z1m8ZHf0WmKUhAMys=
 gopkg.in/ini.v1 v1.51.0 h1:AQvPpx3LzTDM0AjnIRlVFwFFGC+npRopjZxLJj6gdno=
 gopkg.in/ini.v1 v1.51.0/go.mod h1:pNLf8WUiyNEtQjuu5G5vTm06TEv9tsIgeAvK8hOrP4k=
 gopkg.in/resty.v1 v1.12.0/go.mod h1:mDo4pnntr5jdWRML875a/NmxYqAlA73dVijT2AXvQQo=
-gopkg.in/tomb.v1 v1.0.0-20141024135613-dd632973f1e7 h1:uRGJdciOHaEIrze2W8Q3AKkepLTh2hOroT7a+7czfdQ=
 gopkg.in/tomb.v1 v1.0.0-20141024135613-dd632973f1e7/go.mod h1:dt/ZhP58zS4L8KSrWDmTeBkI65Dw0HsyUHuEVlX15mw=
 gopkg.in/yaml.v2 v2.0.0-20170812160011-eb3733d160e7/go.mod h1:JAlM8MvJe8wmxCU4Bli9HhUf9+ttbYbLASfIpnQbh74=
 gopkg.in/yaml.v2 v2.2.1/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v2 v2.2.4/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
-gopkg.in/yaml.v2 v2.2.7 h1:VUgggvou5XRW9mHwD/yXxIYSMtY0zoKQf/v226p2nyo=
-gopkg.in/yaml.v2 v2.2.7/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
-gopkg.in/yaml.v2 v2.2.8 h1:obN1ZagJSUGI0Ek/LBmuj4SNLPfIny3KsKFopxRdj10=
+gopkg.in/yaml.v2 v2.2.5/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v2 v2.2.8/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
+gopkg.in/yaml.v2 v2.3.0/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
+gopkg.in/yaml.v2 v2.4.0 h1:D8xgwECY7CYvx+Y2n4sBz93Jn9JRvxdiyyo8CTfuKaY=
+gopkg.in/yaml.v2 v2.4.0/go.mod h1:RDklbk79AGWmwhnvt/jBztapEOGDOx6ZbXqjP6csGnQ=
+gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c h1:dUUwHk2QECo/6vqA44rthZ8ie2QXMNeKRTHCNY2nXvo=
+gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
 honnef.co/go/tools v0.0.0-20190102054323-c2f93a96b099/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
 honnef.co/go/tools v0.0.0-20190106161140-3f1c8253044a/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
 honnef.co/go/tools v0.0.0-20190418001031-e561f6794a2a/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=

tools/metrics_exporter/main.go

@@ -0,0 +1,56 @@
+package main
+
+import (
+	"flag"
+	"fmt"
+	"log"
+	"net/http"
+
+	"github.com/hibiken/asynq"
+	"github.com/hibiken/asynq/x/metrics"
+	"github.com/prometheus/client_golang/prometheus"
+	"github.com/prometheus/client_golang/prometheus/collectors"
+	"github.com/prometheus/client_golang/prometheus/promhttp"
+)
+
+// Declare command-line flags.
+// These variables are binded to flags in init().
+var (
+	flagRedisAddr     string
+	flagRedisDB       int
+	flagRedisPassword string
+	flagRedisUsername string
+	flagPort          int
+)
+
+func init() {
+	flag.StringVar(&flagRedisAddr, "redis-addr", "127.0.0.1:6379", "host:port of redis server to connect to")
+	flag.IntVar(&flagRedisDB, "redis-db", 0, "redis DB number to use")
+	flag.StringVar(&flagRedisPassword, "redis-password", "", "password used to connect to redis server")
+	flag.StringVar(&flagRedisUsername, "redis-username", "", "username used to connect to redis server")
+	flag.IntVar(&flagPort, "port", 9876, "port to use for the HTTP server")
+}
+
+func main() {
+	flag.Parse()
+	// Using NewPedanticRegistry here to test the implementation of Collectors and Metrics.
+	reg := prometheus.NewPedanticRegistry()
+
+	inspector := asynq.NewInspector(asynq.RedisClientOpt{
+		Addr:     flagRedisAddr,
+		DB:       flagRedisDB,
+		Password: flagRedisPassword,
+		Username: flagRedisUsername,
+	})
+
+	reg.MustRegister(
+		metrics.NewQueueMetricsCollector(inspector),
+		// Add the standard process and go metrics to the registry
+		collectors.NewProcessCollector(collectors.ProcessCollectorOpts{}),
+		collectors.NewGoCollector(),
+	)
+
+	http.Handle("/metrics", promhttp.HandlerFor(reg, promhttp.HandlerOpts{}))
+	log.Printf("exporter server is listening on port: %d\n", flagPort)
+	log.Fatal(http.ListenAndServe(fmt.Sprintf(":%d", flagPort), nil))
+}

x/go.mod

@@ -0,0 +1,25 @@
+module github.com/hibiken/asynq/x
+
+go 1.22
+
+require (
+	github.com/google/uuid v1.6.0
+	github.com/hibiken/asynq v0.25.0
+	github.com/prometheus/client_golang v1.20.5
+	github.com/redis/go-redis/v9 v9.7.0
+)
+
+require (
+	github.com/beorn7/perks v1.0.1 // indirect
+	github.com/cespare/xxhash/v2 v2.3.0 // indirect
+	github.com/dgryski/go-rendezvous v0.0.0-20200823014737-9f7001d12a5f // indirect
+	github.com/munnerz/goautoneg v0.0.0-20191010083416-a7dc8b61c822 // indirect
+	github.com/prometheus/client_model v0.6.1 // indirect
+	github.com/prometheus/common v0.55.0 // indirect
+	github.com/prometheus/procfs v0.15.1 // indirect
+	github.com/robfig/cron/v3 v3.0.1 // indirect
+	github.com/spf13/cast v1.7.0 // indirect
+	golang.org/x/sys v0.26.0 // indirect
+	golang.org/x/time v0.7.0 // indirect
+	google.golang.org/protobuf v1.35.1 // indirect
+)

x/go.sum

@@ -0,0 +1,50 @@
+github.com/beorn7/perks v1.0.1 h1:VlbKKnNfV8bJzeqoa4cOKqO6bYr3WgKZxO8Z16+hsOM=
+github.com/beorn7/perks v1.0.1/go.mod h1:G2ZrVWU2WbWT9wwq4/hrbKbnv/1ERSJQ0ibhJ6rlkpw=
+github.com/bsm/ginkgo/v2 v2.12.0 h1:Ny8MWAHyOepLGlLKYmXG4IEkioBysk6GpaRTLC8zwWs=
+github.com/bsm/ginkgo/v2 v2.12.0/go.mod h1:SwYbGRRDovPVboqFv0tPTcG1sN61LM1Z4ARdbAV9g4c=
+github.com/bsm/gomega v1.27.10 h1:yeMWxP2pV2fG3FgAODIY8EiRE3dy0aeFYt4l7wh6yKA=
+github.com/bsm/gomega v1.27.10/go.mod h1:JyEr/xRbxbtgWNi8tIEVPUYZ5Dzef52k01W3YH0H+O0=
+github.com/cespare/xxhash/v2 v2.3.0 h1:UL815xU9SqsFlibzuggzjXhog7bL6oX9BbNZnL2UFvs=
+github.com/cespare/xxhash/v2 v2.3.0/go.mod h1:VGX0DQ3Q6kWi7AoAeZDth3/j3BFtOZR5XLFGgcrjCOs=
+github.com/dgryski/go-rendezvous v0.0.0-20200823014737-9f7001d12a5f h1:lO4WD4F/rVNCu3HqELle0jiPLLBs70cWOduZpkS1E78=
+github.com/dgryski/go-rendezvous v0.0.0-20200823014737-9f7001d12a5f/go.mod h1:cuUVRXasLTGF7a8hSLbxyZXjz+1KgoB3wDUb6vlszIc=
+github.com/frankban/quicktest v1.14.6 h1:7Xjx+VpznH+oBnejlPUj8oUpdxnVs4f8XU8WnHkI4W8=
+github.com/frankban/quicktest v1.14.6/go.mod h1:4ptaffx2x8+WTWXmUCuVU6aPUX1/Mz7zb5vbUoiM6w0=
+github.com/google/go-cmp v0.6.0 h1:ofyhxvXcZhMsU5ulbFiLKl/XBFqE1GSq7atu8tAmTRI=
+github.com/google/go-cmp v0.6.0/go.mod h1:17dUlkBOakJ0+DkrSSNjCkIjxS6bF9zb3elmeNGIjoY=
+github.com/google/uuid v1.6.0 h1:NIvaJDMOsjHA8n1jAhLSgzrAzy1Hgr+hNrb57e+94F0=
+github.com/google/uuid v1.6.0/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo=
+github.com/hibiken/asynq v0.25.0 h1:VCPyRRrrjFChsTSI8x5OCPu51MlEz6Rk+1p0kHKnZug=
+github.com/hibiken/asynq v0.25.0/go.mod h1:DYQ1etBEl2Y+uSkqFElGYbk3M0ujLVwCfWE+TlvxtEk=
+github.com/klauspost/compress v1.17.9 h1:6KIumPrER1LHsvBVuDa0r5xaG0Es51mhhB9BQB2qeMA=
+github.com/klauspost/compress v1.17.9/go.mod h1:Di0epgTjJY877eYKx5yC51cX2A2Vl2ibi7bDH9ttBbw=
+github.com/kr/pretty v0.3.1 h1:flRD4NNwYAUpkphVc1HcthR4KEIFJ65n8Mw5qdRn3LE=
+github.com/kr/pretty v0.3.1/go.mod h1:hoEshYVHaxMs3cyo3Yncou5ZscifuDolrwPKZanG3xk=
+github.com/kr/text v0.2.0 h1:5Nx0Ya0ZqY2ygV366QzturHI13Jq95ApcVaJBhpS+AY=
+github.com/kr/text v0.2.0/go.mod h1:eLer722TekiGuMkidMxC/pM04lWEeraHUUmBw8l2grE=
+github.com/munnerz/goautoneg v0.0.0-20191010083416-a7dc8b61c822 h1:C3w9PqII01/Oq1c1nUAm88MOHcQC9l5mIlSMApZMrHA=
+github.com/munnerz/goautoneg v0.0.0-20191010083416-a7dc8b61c822/go.mod h1:+n7T8mK8HuQTcFwEeznm/DIxMOiR9yIdICNftLE1DvQ=
+github.com/prometheus/client_golang v1.20.5 h1:cxppBPuYhUnsO6yo/aoRol4L7q7UFfdm+bR9r+8l63Y=
+github.com/prometheus/client_golang v1.20.5/go.mod h1:PIEt8X02hGcP8JWbeHyeZ53Y/jReSnHgO035n//V5WE=
+github.com/prometheus/client_model v0.6.1 h1:ZKSh/rekM+n3CeS952MLRAdFwIKqeY8b62p8ais2e9E=
+github.com/prometheus/client_model v0.6.1/go.mod h1:OrxVMOVHjw3lKMa8+x6HeMGkHMQyHDk9E3jmP2AmGiY=
+github.com/prometheus/common v0.55.0 h1:KEi6DK7lXW/m7Ig5i47x0vRzuBsHuvJdi5ee6Y3G1dc=
+github.com/prometheus/common v0.55.0/go.mod h1:2SECS4xJG1kd8XF9IcM1gMX6510RAEL65zxzNImwdc8=
+github.com/prometheus/procfs v0.15.1 h1:YagwOFzUgYfKKHX6Dr+sHT7km/hxC76UB0learggepc=
+github.com/prometheus/procfs v0.15.1/go.mod h1:fB45yRUv8NstnjriLhBQLuOUt+WW4BsoGhij/e3PBqk=
+github.com/redis/go-redis/v9 v9.7.0 h1:HhLSs+B6O021gwzl+locl0zEDnyNkxMtf/Z3NNBMa9E=
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+github.com/robfig/cron/v3 v3.0.1 h1:WdRxkvbJztn8LMz/QEvLN5sBU+xKpSqwwUO1Pjr4qDs=
+github.com/robfig/cron/v3 v3.0.1/go.mod h1:eQICP3HwyT7UooqI/z+Ov+PtYAWygg1TEWWzGIFLtro=
+github.com/rogpeppe/go-internal v1.10.0 h1:TMyTOH3F/DB16zRVcYyreMH6GnZZrwQVAoYjRBZyWFQ=
+github.com/rogpeppe/go-internal v1.10.0/go.mod h1:UQnix2H7Ngw/k4C5ijL5+65zddjncjaFoBhdsK/akog=
+github.com/spf13/cast v1.7.0 h1:ntdiHjuueXFgm5nzDRdOS4yfT43P5Fnud6DH50rz/7w=
+github.com/spf13/cast v1.7.0/go.mod h1:ancEpBxwJDODSW/UG4rDrAqiKolqNNh2DX3mk86cAdo=
+go.uber.org/goleak v1.3.0 h1:2K3zAYmnTNqV73imy9J1T3WC+gmCePx2hEGkimedGto=
+go.uber.org/goleak v1.3.0/go.mod h1:CoHD4mav9JJNrW/WLlf7HGZPjdw8EucARQHekz1X6bE=
+golang.org/x/sys v0.26.0 h1:KHjCJyddX0LoSTb3J+vWpupP9p0oznkqVk/IfjymZbo=
+golang.org/x/sys v0.26.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=
+golang.org/x/time v0.7.0 h1:ntUhktv3OPE6TgYxXWv9vKvUSJyIFJlyohwbkEwPrKQ=
+golang.org/x/time v0.7.0/go.mod h1:3BpzKBy/shNhVucY/MWOyx10tF3SFh9QdLuxbVysPQM=
+google.golang.org/protobuf v1.35.1 h1:m3LfL6/Ca+fqnjnlqQXNpFPABW1UD7mjh8KO2mKFytA=
+google.golang.org/protobuf v1.35.1/go.mod h1:9fA7Ob0pmnwhb644+1+CVWFRbNajQ6iRojtC/QF5bRE=

x/metrics/metrics.go

@@ -0,0 +1,190 @@
+// Package metrics provides implementations of prometheus.Collector to collect Asynq queue metrics.
+package metrics
+
+import (
+	"fmt"
+	"log"
+
+	"github.com/hibiken/asynq"
+	"github.com/prometheus/client_golang/prometheus"
+)
+
+// Namespace used in fully-qualified metrics names.
+const namespace = "asynq"
+
+// QueueMetricsCollector gathers queue metrics.
+// It implements prometheus.Collector interface.
+//
+// All metrics exported from this collector have prefix "asynq".
+type QueueMetricsCollector struct {
+	inspector *asynq.Inspector
+}
+
+// collectQueueInfo gathers QueueInfo of all queues.
+// Since this operation is expensive, it must be called once per collection.
+func (qmc *QueueMetricsCollector) collectQueueInfo() ([]*asynq.QueueInfo, error) {
+	qnames, err := qmc.inspector.Queues()
+	if err != nil {
+		return nil, fmt.Errorf("failed to get queue names: %v", err)
+	}
+	infos := make([]*asynq.QueueInfo, len(qnames))
+	for i, qname := range qnames {
+		qinfo, err := qmc.inspector.GetQueueInfo(qname)
+		if err != nil {
+			return nil, fmt.Errorf("failed to get queue info: %v", err)
+		}
+		infos[i] = qinfo
+	}
+	return infos, nil
+}
+
+// Descriptors used by QueueMetricsCollector
+var (
+	tasksQueuedDesc = prometheus.NewDesc(
+		prometheus.BuildFQName(namespace, "", "tasks_enqueued_total"),
+		"Number of tasks enqueued; broken down by queue and state.",
+		[]string{"queue", "state"}, nil,
+	)
+
+	queueSizeDesc = prometheus.NewDesc(
+		prometheus.BuildFQName(namespace, "", "queue_size"),
+		"Number of tasks in a queue",
+		[]string{"queue"}, nil,
+	)
+
+	queueLatencyDesc = prometheus.NewDesc(
+		prometheus.BuildFQName(namespace, "", "queue_latency_seconds"),
+		"Number of seconds the oldest pending task is waiting in pending state to be processed.",
+		[]string{"queue"}, nil,
+	)
+
+	queueMemUsgDesc = prometheus.NewDesc(
+		prometheus.BuildFQName(namespace, "", "queue_memory_usage_approx_bytes"),
+		"Number of memory used by a given queue (approximated number by sampling).",
+		[]string{"queue"}, nil,
+	)
+
+	tasksProcessedTotalDesc = prometheus.NewDesc(
+		prometheus.BuildFQName(namespace, "", "tasks_processed_total"),
+		"Number of tasks processed (both succeeded and failed); broken down by queue",
+		[]string{"queue"}, nil,
+	)
+
+	tasksFailedTotalDesc = prometheus.NewDesc(
+		prometheus.BuildFQName(namespace, "", "tasks_failed_total"),
+		"Number of tasks failed; broken down by queue",
+		[]string{"queue"}, nil,
+	)
+
+	pausedQueues = prometheus.NewDesc(
+		prometheus.BuildFQName(namespace, "", "queue_paused_total"),
+		"Number of queues paused",
+		[]string{"queue"}, nil,
+	)
+)
+
+func (qmc *QueueMetricsCollector) Describe(ch chan<- *prometheus.Desc) {
+	prometheus.DescribeByCollect(qmc, ch)
+}
+
+func (qmc *QueueMetricsCollector) Collect(ch chan<- prometheus.Metric) {
+	queueInfos, err := qmc.collectQueueInfo()
+	if err != nil {
+		log.Printf("Failed to collect metrics data: %v", err)
+	}
+	for _, info := range queueInfos {
+		ch <- prometheus.MustNewConstMetric(
+			tasksQueuedDesc,
+			prometheus.GaugeValue,
+			float64(info.Active),
+			info.Queue,
+			"active",
+		)
+		ch <- prometheus.MustNewConstMetric(
+			tasksQueuedDesc,
+			prometheus.GaugeValue,
+			float64(info.Pending),
+			info.Queue,
+			"pending",
+		)
+		ch <- prometheus.MustNewConstMetric(
+			tasksQueuedDesc,
+			prometheus.GaugeValue,
+			float64(info.Scheduled),
+			info.Queue,
+			"scheduled",
+		)
+		ch <- prometheus.MustNewConstMetric(
+			tasksQueuedDesc,
+			prometheus.GaugeValue,
+			float64(info.Retry),
+			info.Queue,
+			"retry",
+		)
+		ch <- prometheus.MustNewConstMetric(
+			tasksQueuedDesc,
+			prometheus.GaugeValue,
+			float64(info.Archived),
+			info.Queue,
+			"archived",
+		)
+		ch <- prometheus.MustNewConstMetric(
+			tasksQueuedDesc,
+			prometheus.GaugeValue,
+			float64(info.Completed),
+			info.Queue,
+			"completed",
+		)
+
+		ch <- prometheus.MustNewConstMetric(
+			queueSizeDesc,
+			prometheus.GaugeValue,
+			float64(info.Size),
+			info.Queue,
+		)
+
+		ch <- prometheus.MustNewConstMetric(
+			queueLatencyDesc,
+			prometheus.GaugeValue,
+			info.Latency.Seconds(),
+			info.Queue,
+		)
+
+		ch <- prometheus.MustNewConstMetric(
+			queueMemUsgDesc,
+			prometheus.GaugeValue,
+			float64(info.MemoryUsage),
+			info.Queue,
+		)
+
+		ch <- prometheus.MustNewConstMetric(
+			tasksProcessedTotalDesc,
+			prometheus.CounterValue,
+			float64(info.ProcessedTotal),
+			info.Queue,
+		)
+
+		ch <- prometheus.MustNewConstMetric(
+			tasksFailedTotalDesc,
+			prometheus.CounterValue,
+			float64(info.FailedTotal),
+			info.Queue,
+		)
+
+		pausedValue := 0 // zero to indicate "not paused"
+		if info.Paused {
+			pausedValue = 1
+		}
+		ch <- prometheus.MustNewConstMetric(
+			pausedQueues,
+			prometheus.GaugeValue,
+			float64(pausedValue),
+			info.Queue,
+		)
+	}
+}
+
+// NewQueueMetricsCollector returns a collector that exports metrics about Asynq queues.
+func NewQueueMetricsCollector(inspector *asynq.Inspector) *QueueMetricsCollector {
+	return &QueueMetricsCollector{inspector: inspector}
+}

x/rate/example_test.go

@@ -0,0 +1,40 @@
+package rate_test
+
+import (
+	"context"
+	"fmt"
+	"time"
+
+	"github.com/hibiken/asynq"
+	"github.com/hibiken/asynq/x/rate"
+)
+
+type RateLimitError struct {
+	RetryIn time.Duration
+}
+
+func (e *RateLimitError) Error() string {
+	return fmt.Sprintf("rate limited (retry in  %v)", e.RetryIn)
+}
+
+func ExampleNewSemaphore() {
+	redisConnOpt := asynq.RedisClientOpt{Addr: ":6379"}
+	sema := rate.NewSemaphore(redisConnOpt, "my_queue", 10)
+	// call sema.Close() when appropriate
+
+	_ = asynq.HandlerFunc(func(ctx context.Context, task *asynq.Task) error {
+		ok, err := sema.Acquire(ctx)
+		if err != nil {
+			return err
+		}
+		if !ok {
+			return &RateLimitError{RetryIn: 30 * time.Second}
+		}
+
+		// Make sure to release the token once we're done.
+		defer sema.Release(ctx)
+
+		// Process task
+		return nil
+	})
+}

x/rate/semaphore.go

@@ -0,0 +1,114 @@
+// Package rate contains rate limiting strategies for asynq.Handler(s).
+package rate
+
+import (
+	"context"
+	"fmt"
+	"strings"
+	"time"
+
+	"github.com/hibiken/asynq"
+	asynqcontext "github.com/hibiken/asynq/internal/context"
+	"github.com/redis/go-redis/v9"
+)
+
+// NewSemaphore creates a counting Semaphore for the given scope with the given number of tokens.
+func NewSemaphore(rco asynq.RedisConnOpt, scope string, maxTokens int) *Semaphore {
+	rc, ok := rco.MakeRedisClient().(redis.UniversalClient)
+	if !ok {
+		panic(fmt.Sprintf("rate.NewSemaphore: unsupported RedisConnOpt type %T", rco))
+	}
+
+	if maxTokens < 1 {
+		panic("rate.NewSemaphore: maxTokens cannot be less than 1")
+	}
+
+	if len(strings.TrimSpace(scope)) == 0 {
+		panic("rate.NewSemaphore: scope should not be empty")
+	}
+
+	return &Semaphore{
+		rc:        rc,
+		scope:     scope,
+		maxTokens: maxTokens,
+	}
+}
+
+// Semaphore is a distributed counting semaphore which can be used to set maxTokens across multiple asynq servers.
+type Semaphore struct {
+	rc        redis.UniversalClient
+	maxTokens int
+	scope     string
+}
+
+// KEYS[1] -> asynq:sema:<scope>
+// ARGV[1] -> max concurrency
+// ARGV[2] -> current time in unix time
+// ARGV[3] -> deadline in unix time
+// ARGV[4] -> task ID
+var acquireCmd = redis.NewScript(`
+redis.call("ZREMRANGEBYSCORE", KEYS[1], "-inf", tonumber(ARGV[2])-1)
+local count = redis.call("ZCARD", KEYS[1])
+
+if (count < tonumber(ARGV[1])) then
+     redis.call("ZADD", KEYS[1], ARGV[3], ARGV[4])
+     return 'true'
+else
+     return 'false'
+end
+`)
+
+// Acquire attempts to acquire a token from the semaphore.
+// - Returns (true, nil), iff semaphore key exists and current value is less than maxTokens
+// - Returns (false, nil) when token cannot be acquired
+// - Returns (false, error) otherwise
+//
+// The context.Context passed to Acquire must have a deadline set,
+// this ensures that token is released if the job goroutine crashes and does not call Release.
+func (s *Semaphore) Acquire(ctx context.Context) (bool, error) {
+	d, ok := ctx.Deadline()
+	if !ok {
+		return false, fmt.Errorf("provided context must have a deadline")
+	}
+
+	taskID, ok := asynqcontext.GetTaskID(ctx)
+	if !ok {
+		return false, fmt.Errorf("provided context is missing task ID value")
+	}
+
+	return acquireCmd.Run(ctx, s.rc,
+		[]string{semaphoreKey(s.scope)},
+		s.maxTokens,
+		time.Now().Unix(),
+		d.Unix(),
+		taskID,
+	).Bool()
+}
+
+// Release will release the token on the counting semaphore.
+func (s *Semaphore) Release(ctx context.Context) error {
+	taskID, ok := asynqcontext.GetTaskID(ctx)
+	if !ok {
+		return fmt.Errorf("provided context is missing task ID value")
+	}
+
+	n, err := s.rc.ZRem(ctx, semaphoreKey(s.scope), taskID).Result()
+	if err != nil {
+		return fmt.Errorf("redis command failed: %v", err)
+	}
+
+	if n == 0 {
+		return fmt.Errorf("no token found for task %q", taskID)
+	}
+
+	return nil
+}
+
+// Close closes the connection to redis.
+func (s *Semaphore) Close() error {
+	return s.rc.Close()
+}
+
+func semaphoreKey(scope string) string {
+	return "asynq:sema:" + scope
+}

x/rate/semaphore_test.go

@@ -0,0 +1,408 @@
+package rate
+
+import (
+	"context"
+	"flag"
+	"fmt"
+	"strings"
+	"testing"
+	"time"
+
+	"github.com/google/uuid"
+	"github.com/hibiken/asynq"
+	"github.com/hibiken/asynq/internal/base"
+	asynqcontext "github.com/hibiken/asynq/internal/context"
+	"github.com/redis/go-redis/v9"
+)
+
+var (
+	redisAddr string
+	redisDB   int
+
+	useRedisCluster   bool
+	redisClusterAddrs string // comma-separated list of host:port
+)
+
+func init() {
+	flag.StringVar(&redisAddr, "redis_addr", "localhost:6379", "redis address to use in testing")
+	flag.IntVar(&redisDB, "redis_db", 14, "redis db number to use in testing")
+	flag.BoolVar(&useRedisCluster, "redis_cluster", false, "use redis cluster as a broker in testing")
+	flag.StringVar(&redisClusterAddrs, "redis_cluster_addrs", "localhost:7000,localhost:7001,localhost:7002", "comma separated list of redis server addresses")
+}
+
+func TestNewSemaphore(t *testing.T) {
+	tests := []struct {
+		desc           string
+		name           string
+		maxConcurrency int
+		wantPanic      string
+		connOpt        asynq.RedisConnOpt
+	}{
+		{
+			desc:      "Bad RedisConnOpt",
+			wantPanic: "rate.NewSemaphore: unsupported RedisConnOpt type *rate.badConnOpt",
+			connOpt:   &badConnOpt{},
+		},
+		{
+			desc:      "Zero maxTokens should panic",
+			wantPanic: "rate.NewSemaphore: maxTokens cannot be less than 1",
+		},
+		{
+			desc:           "Empty scope should panic",
+			maxConcurrency: 2,
+			name:           "    ",
+			wantPanic:      "rate.NewSemaphore: scope should not be empty",
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.desc, func(t *testing.T) {
+			if tt.wantPanic != "" {
+				defer func() {
+					if r := recover(); r.(string) != tt.wantPanic {
+						t.Errorf("%s;\nNewSemaphore should panic with msg: %s, got %s", tt.desc, tt.wantPanic, r.(string))
+					}
+				}()
+			}
+
+			opt := tt.connOpt
+			if tt.connOpt == nil {
+				opt = getRedisConnOpt(t)
+			}
+
+			sema := NewSemaphore(opt, tt.name, tt.maxConcurrency)
+			defer sema.Close()
+		})
+	}
+}
+
+func TestNewSemaphore_Acquire(t *testing.T) {
+	tests := []struct {
+		desc           string
+		name           string
+		maxConcurrency int
+		taskIDs        []string
+		ctxFunc        func(string) (context.Context, context.CancelFunc)
+		want           []bool
+	}{
+		{
+			desc:           "Should acquire token when current token count is less than maxTokens",
+			name:           "task-1",
+			maxConcurrency: 3,
+			taskIDs:        []string{uuid.NewString(), uuid.NewString()},
+			ctxFunc: func(id string) (context.Context, context.CancelFunc) {
+				return asynqcontext.New(context.Background(), &base.TaskMessage{
+					ID:    id,
+					Queue: "task-1",
+				}, time.Now().Add(time.Second))
+			},
+			want: []bool{true, true},
+		},
+		{
+			desc:           "Should fail acquiring token when current token count is equal to maxTokens",
+			name:           "task-2",
+			maxConcurrency: 3,
+			taskIDs:        []string{uuid.NewString(), uuid.NewString(), uuid.NewString(), uuid.NewString()},
+			ctxFunc: func(id string) (context.Context, context.CancelFunc) {
+				return asynqcontext.New(context.Background(), &base.TaskMessage{
+					ID:    id,
+					Queue: "task-2",
+				}, time.Now().Add(time.Second))
+			},
+			want: []bool{true, true, true, false},
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.desc, func(t *testing.T) {
+			opt := getRedisConnOpt(t)
+			rc := opt.MakeRedisClient().(redis.UniversalClient)
+			defer rc.Close()
+
+			if err := rc.Del(context.Background(), semaphoreKey(tt.name)).Err(); err != nil {
+				t.Errorf("%s;\nredis.UniversalClient.Del() got error %v", tt.desc, err)
+			}
+
+			sema := NewSemaphore(opt, tt.name, tt.maxConcurrency)
+			defer sema.Close()
+
+			for i := 0; i < len(tt.taskIDs); i++ {
+				ctx, cancel := tt.ctxFunc(tt.taskIDs[i])
+
+				got, err := sema.Acquire(ctx)
+				if err != nil {
+					t.Errorf("%s;\nSemaphore.Acquire() got error %v", tt.desc, err)
+				}
+
+				if got != tt.want[i] {
+					t.Errorf("%s;\nSemaphore.Acquire(ctx) returned %v, want %v", tt.desc, got, tt.want[i])
+				}
+
+				cancel()
+			}
+		})
+	}
+}
+
+func TestNewSemaphore_Acquire_Error(t *testing.T) {
+	tests := []struct {
+		desc           string
+		name           string
+		maxConcurrency int
+		taskIDs        []string
+		ctxFunc        func(string) (context.Context, context.CancelFunc)
+		errStr         string
+	}{
+		{
+			desc:           "Should return error if context has no deadline",
+			name:           "task-3",
+			maxConcurrency: 1,
+			taskIDs:        []string{uuid.NewString(), uuid.NewString()},
+			ctxFunc: func(id string) (context.Context, context.CancelFunc) {
+				return context.Background(), func() {}
+			},
+			errStr: "provided context must have a deadline",
+		},
+		{
+			desc:           "Should return error when context is missing taskID",
+			name:           "task-4",
+			maxConcurrency: 1,
+			taskIDs:        []string{uuid.NewString()},
+			ctxFunc: func(_ string) (context.Context, context.CancelFunc) {
+				return context.WithTimeout(context.Background(), time.Second)
+			},
+			errStr: "provided context is missing task ID value",
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.desc, func(t *testing.T) {
+			opt := getRedisConnOpt(t)
+			rc := opt.MakeRedisClient().(redis.UniversalClient)
+			defer rc.Close()
+
+			if err := rc.Del(context.Background(), semaphoreKey(tt.name)).Err(); err != nil {
+				t.Errorf("%s;\nredis.UniversalClient.Del() got error %v", tt.desc, err)
+			}
+
+			sema := NewSemaphore(opt, tt.name, tt.maxConcurrency)
+			defer sema.Close()
+
+			for i := 0; i < len(tt.taskIDs); i++ {
+				ctx, cancel := tt.ctxFunc(tt.taskIDs[i])
+
+				_, err := sema.Acquire(ctx)
+				if err == nil || err.Error() != tt.errStr {
+					t.Errorf("%s;\nSemaphore.Acquire() got error %v want error %v", tt.desc, err, tt.errStr)
+				}
+
+				cancel()
+			}
+		})
+	}
+}
+
+func TestNewSemaphore_Acquire_StaleToken(t *testing.T) {
+	opt := getRedisConnOpt(t)
+	rc := opt.MakeRedisClient().(redis.UniversalClient)
+	defer rc.Close()
+
+	taskID := uuid.NewString()
+
+	// adding a set member to mimic the case where token is acquired but the goroutine crashed,
+	// in which case, the token will not be explicitly removed and should be present already
+	rc.ZAdd(context.Background(), semaphoreKey("stale-token"), redis.Z{
+		Score:  float64(time.Now().Add(-10 * time.Second).Unix()),
+		Member: taskID,
+	})
+
+	sema := NewSemaphore(opt, "stale-token", 1)
+	defer sema.Close()
+
+	ctx, cancel := asynqcontext.New(context.Background(), &base.TaskMessage{
+		ID:    taskID,
+		Queue: "task-1",
+	}, time.Now().Add(time.Second))
+	defer cancel()
+
+	got, err := sema.Acquire(ctx)
+	if err != nil {
+		t.Errorf("Acquire_StaleToken;\nSemaphore.Acquire() got error %v", err)
+	}
+
+	if !got {
+		t.Error("Acquire_StaleToken;\nSemaphore.Acquire() got false want true")
+	}
+}
+
+func TestNewSemaphore_Release(t *testing.T) {
+	tests := []struct {
+		desc      string
+		name      string
+		taskIDs   []string
+		ctxFunc   func(string) (context.Context, context.CancelFunc)
+		wantCount int64
+	}{
+		{
+			desc:    "Should decrease token count",
+			name:    "task-5",
+			taskIDs: []string{uuid.NewString()},
+			ctxFunc: func(id string) (context.Context, context.CancelFunc) {
+				return asynqcontext.New(context.Background(), &base.TaskMessage{
+					ID:    id,
+					Queue: "task-3",
+				}, time.Now().Add(time.Second))
+			},
+		},
+		{
+			desc:    "Should decrease token count by 2",
+			name:    "task-6",
+			taskIDs: []string{uuid.NewString(), uuid.NewString()},
+			ctxFunc: func(id string) (context.Context, context.CancelFunc) {
+				return asynqcontext.New(context.Background(), &base.TaskMessage{
+					ID:    id,
+					Queue: "task-4",
+				}, time.Now().Add(time.Second))
+			},
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.desc, func(t *testing.T) {
+			opt := getRedisConnOpt(t)
+			rc := opt.MakeRedisClient().(redis.UniversalClient)
+			defer rc.Close()
+
+			if err := rc.Del(context.Background(), semaphoreKey(tt.name)).Err(); err != nil {
+				t.Errorf("%s;\nredis.UniversalClient.Del() got error %v", tt.desc, err)
+			}
+
+			var members []redis.Z
+			for i := 0; i < len(tt.taskIDs); i++ {
+				members = append(members, redis.Z{
+					Score:  float64(time.Now().Add(time.Duration(i) * time.Second).Unix()),
+					Member: tt.taskIDs[i],
+				})
+			}
+			if err := rc.ZAdd(context.Background(), semaphoreKey(tt.name), members...).Err(); err != nil {
+				t.Errorf("%s;\nredis.UniversalClient.ZAdd() got error %v", tt.desc, err)
+			}
+
+			sema := NewSemaphore(opt, tt.name, 3)
+			defer sema.Close()
+
+			for i := 0; i < len(tt.taskIDs); i++ {
+				ctx, cancel := tt.ctxFunc(tt.taskIDs[i])
+
+				if err := sema.Release(ctx); err != nil {
+					t.Errorf("%s;\nSemaphore.Release() got error %v", tt.desc, err)
+				}
+
+				cancel()
+			}
+
+			i, err := rc.ZCount(context.Background(), semaphoreKey(tt.name), "-inf", "+inf").Result()
+			if err != nil {
+				t.Errorf("%s;\nredis.UniversalClient.ZCount() got error %v", tt.desc, err)
+			}
+
+			if i != tt.wantCount {
+				t.Errorf("%s;\nSemaphore.Release(ctx) didn't release token, got %v want 0", tt.desc, i)
+			}
+		})
+	}
+}
+
+func TestNewSemaphore_Release_Error(t *testing.T) {
+	testID := uuid.NewString()
+
+	tests := []struct {
+		desc    string
+		name    string
+		taskIDs []string
+		ctxFunc func(string) (context.Context, context.CancelFunc)
+		errStr  string
+	}{
+		{
+			desc:    "Should return error when context is missing taskID",
+			name:    "task-7",
+			taskIDs: []string{uuid.NewString()},
+			ctxFunc: func(_ string) (context.Context, context.CancelFunc) {
+				return context.WithTimeout(context.Background(), time.Second)
+			},
+			errStr: "provided context is missing task ID value",
+		},
+		{
+			desc:    "Should return error when context has taskID which never acquired token",
+			name:    "task-8",
+			taskIDs: []string{uuid.NewString()},
+			ctxFunc: func(_ string) (context.Context, context.CancelFunc) {
+				return asynqcontext.New(context.Background(), &base.TaskMessage{
+					ID:    testID,
+					Queue: "task-4",
+				}, time.Now().Add(time.Second))
+			},
+			errStr: fmt.Sprintf("no token found for task %q", testID),
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.desc, func(t *testing.T) {
+			opt := getRedisConnOpt(t)
+			rc := opt.MakeRedisClient().(redis.UniversalClient)
+			defer rc.Close()
+
+			if err := rc.Del(context.Background(), semaphoreKey(tt.name)).Err(); err != nil {
+				t.Errorf("%s;\nredis.UniversalClient.Del() got error %v", tt.desc, err)
+			}
+
+			var members []redis.Z
+			for i := 0; i < len(tt.taskIDs); i++ {
+				members = append(members, redis.Z{
+					Score:  float64(time.Now().Add(time.Duration(i) * time.Second).Unix()),
+					Member: tt.taskIDs[i],
+				})
+			}
+			if err := rc.ZAdd(context.Background(), semaphoreKey(tt.name), members...).Err(); err != nil {
+				t.Errorf("%s;\nredis.UniversalClient.ZAdd() got error %v", tt.desc, err)
+			}
+
+			sema := NewSemaphore(opt, tt.name, 3)
+			defer sema.Close()
+
+			for i := 0; i < len(tt.taskIDs); i++ {
+				ctx, cancel := tt.ctxFunc(tt.taskIDs[i])
+
+				if err := sema.Release(ctx); err == nil || err.Error() != tt.errStr {
+					t.Errorf("%s;\nSemaphore.Release() got error %v want error %v", tt.desc, err, tt.errStr)
+				}
+
+				cancel()
+			}
+		})
+	}
+}
+
+func getRedisConnOpt(tb testing.TB) asynq.RedisConnOpt {
+	tb.Helper()
+	if useRedisCluster {
+		addrs := strings.Split(redisClusterAddrs, ",")
+		if len(addrs) == 0 {
+			tb.Fatal("No redis cluster addresses provided. Please set addresses using --redis_cluster_addrs flag.")
+		}
+		return asynq.RedisClusterClientOpt{
+			Addrs: addrs,
+		}
+	}
+	return asynq.RedisClientOpt{
+		Addr: redisAddr,
+		DB:   redisDB,
+	}
+}
+
+type badConnOpt struct {
+}
+
+func (b badConnOpt) MakeRedisClient() interface{} {
+	return nil
+}