v0.19.0

* Added Retention Option to specify retention TTL for tasks
* Added ResultWriter as a client interface to write result data for the associated task

.github/FUNDING.yml

@@ -0,0 +1,12 @@
+# These are supported funding model platforms
+
+github: [hibiken] # Replace with up to 4 GitHub Sponsors-enabled usernames e.g., [user1, user2]
+patreon: # Replace with a single Patreon username
+open_collective: # Replace with a single Open Collective username
+ko_fi: # Replace with a single Ko-fi username
+tidelift: # Replace with a single Tidelift platform-name/package-name e.g., npm/babel
+community_bridge: # Replace with a single Community Bridge project-name e.g., cloud-foundry
+liberapay: # Replace with a single Liberapay username
+issuehunt: # Replace with a single IssueHunt username
+otechie: # Replace with a single Otechie username
+custom: # Replace with up to 4 custom sponsorship URLs e.g., ['link1', 'link2']

.github/workflows/build.yml

@@ -7,7 +7,7 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-latest]
-        go-version: [1.13.x, 1.14.x, 1.15.x, 1.16.x]
+        go-version: [1.14.x, 1.15.x, 1.16.x, 1.17.x]
     runs-on: ${{ matrix.os }}
     services:
       redis:

.gitignore

@@ -22,3 +22,4 @@
 
 # Ignore editor config files
 .vscode
+.idea

CHANGELOG.md

@@ -7,7 +7,61 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
-## [0.18.1] - 2020-07-04
+## [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] - 2021-07-15
+
+### Changed
+
+- Changed `Queue` function to not to convert the provided queue name to lowercase. Queue names are now case-sensitive.
+- `QueueInfo.MemoryUsage` is now an approximate usage value.
+
+### Fixed
+
+- Fixed latency issue around memory usage (see https://github.com/hibiken/asynq/issues/309).
+
+## [0.18.1] - 2021-07-04
 
 ### Changed
 

README.md

@@ -28,8 +28,8 @@ Task queues are used as a mechanism to distribute work across multiple machines.
 - Scheduling of tasks
 - [Retries](https://github.com/hibiken/asynq/wiki/Task-Retry) of failed tasks
 - Automatic recovery of tasks in the event of a worker crash
-- [Weighted priority queues](https://github.com/hibiken/asynq/wiki/Priority-Queues#weighted-priority-queues)
+- [Weighted priority queues](https://github.com/hibiken/asynq/wiki/Queue-Priority#weighted-priority)
-- [Strict priority queues](https://github.com/hibiken/asynq/wiki/Priority-Queues#strict-priority-queues)
+- [Strict priority queues](https://github.com/hibiken/asynq/wiki/Queue-Priority#strict-priority)
 - 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)
@@ -49,7 +49,7 @@ Task queues are used as a mechanism to distribute work across multiple machines.
 
 ## 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/)). Version `1.14` or higher is required.
 
 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:
 
@@ -91,7 +91,7 @@ type ImageResizePayload struct {
 //----------------------------------------------
 
 func NewEmailDeliveryTask(userID int, tmplID string) (*asynq.Task, error) {
-    payload, err := json.Marshal(EmailDeliveryPayload{UserID: userID, TemplateID: templID})
+    payload, err := json.Marshal(EmailDeliveryPayload{UserID: userID, TemplateID: tmplID})
     if err != nil {
         return nil, err
     }
@@ -103,7 +103,8 @@ 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
 }
 
 //---------------------------------------------------------------
@@ -129,7 +130,7 @@ type ImageProcessor struct {
     // ... fields for struct
 }
 
-func (p *ImageProcessor) ProcessTask(ctx context.Context, t *asynq.Task) error {
+func (processor *ImageProcessor) ProcessTask(ctx context.Context, t *asynq.Task) error {
     var p ImageResizePayload
     if err := json.Unmarshal(t.Payload(), &p); err != nil {
         return fmt.Errorf("json.Unmarshal failed: %v: %w", err, asynq.SkipRetry)
@@ -140,7 +141,7 @@ func (p *ImageProcessor) ProcessTask(ctx context.Context, t *asynq.Task) error {
 }
 
 func NewImageProcessor() *ImageProcessor {
-    // ... return an instance
+	return &ImageProcessor{}
 }
 ```
 
@@ -196,28 +197,15 @@ 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 +227,7 @@ 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,

asynq.go

@@ -5,6 +5,7 @@
 package asynq
 
 import (
+	"context"
 	"crypto/tls"
 	"fmt"
 	"net/url"
@@ -12,7 +13,7 @@ import (
 	"strings"
 	"time"
 
-	"github.com/go-redis/redis/v7"
+	"github.com/go-redis/redis/v8"
 	"github.com/hibiken/asynq/internal/base"
 )
 
@@ -23,16 +24,39 @@ 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,
 	}
 }
 
@@ -76,11 +100,31 @@ type TaskInfo struct {
 	// NextProcessAt is the time the task is scheduled to be processed,
 	// zero if not applicable.
 	NextProcessAt time.Time
+
+	// 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?
@@ -88,18 +132,12 @@ func newTaskInfo(msg *base.TaskMessage, state base.TaskState, nextProcessAt time
 		Retried:       msg.Retried,
 		LastErr:       msg.ErrorMsg,
 		Timeout:       time.Duration(msg.Timeout) * time.Second,
+		Deadline:      fromUnixTimeOrZero(msg.Deadline),
+		Retention:     time.Duration(msg.Retention) * time.Second,
 		NextProcessAt: nextProcessAt,
-	}
+		LastFailedAt:  fromUnixTimeOrZero(msg.LastFailedAt),
-	if msg.LastFailedAt == 0 {
+		CompletedAt:   fromUnixTimeOrZero(msg.CompletedAt),
-		info.LastFailedAt = time.Time{}
+		Result:        result,
-	} else {
-		info.LastFailedAt = time.Unix(msg.LastFailedAt, 0)
-	}
-
-	if msg.Deadline == 0 {
-		info.Deadline = time.Time{}
-	} else {
-		info.Deadline = time.Unix(msg.Deadline, 0)
 	}
 
 	switch state {
@@ -113,6 +151,8 @@ 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
 	default:
 		panic(fmt.Sprintf("internal error: unknown state: %d", state))
 	}
@@ -137,6 +177,9 @@ 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
 )
 
 func (s TaskState) String() string {
@@ -151,6 +194,8 @@ func (s TaskState) String() string {
 		return "retry"
 	case TaskStateArchived:
 		return "archived"
+	case TaskStateCompleted:
+		return "completed"
 	}
 	panic("asynq: unknown task state")
 }
@@ -435,3 +480,27 @@ func parseRedisSentinelURI(u *url.URL) (RedisConnOpt, error) {
 	}
 	return RedisFailoverClientOpt{MasterName: master, SentinelAddrs: addrs, Password: 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

@@ -10,7 +10,7 @@ import (
 	"strings"
 	"testing"
 
-	"github.com/go-redis/redis/v7"
+	"github.com/go-redis/redis/v8"
 	"github.com/google/go-cmp/cmp"
 	h "github.com/hibiken/asynq/internal/asynqtest"
 	"github.com/hibiken/asynq/internal/log"

client.go

@@ -7,10 +7,9 @@ package asynq
 import (
 	"fmt"
 	"strings"
-	"sync"
 	"time"
 
-	"github.com/go-redis/redis/v7"
+	"github.com/go-redis/redis/v8"
 	"github.com/google/uuid"
 	"github.com/hibiken/asynq/internal/base"
 	"github.com/hibiken/asynq/internal/errors"
@@ -24,8 +23,6 @@ import (
 //
 // Clients are safe for concurrent use by multiple goroutines.
 type Client struct {
-	mu   sync.Mutex
-	opts map[string][]Option
 	rdb *rdb.RDB
 }
 
@@ -35,11 +32,7 @@ func NewClient(r RedisConnOpt) *Client {
 	if !ok {
 		panic(fmt.Sprintf("asynq: unsupported RedisConnOpt type %T", r))
 	}
-	rdb := rdb.NewRDB(c)
+	return &Client{rdb: rdb.NewRDB(c)}
-	return &Client{
-		opts: make(map[string][]Option),
-		rdb:  rdb,
-	}
 }
 
 type OptionType int
@@ -52,6 +45,8 @@ const (
 	UniqueOpt
 	ProcessAtOpt
 	ProcessInOpt
+	TaskIDOpt
+	RetentionOpt
 )
 
 // Option specifies the task processing behavior.
@@ -70,11 +65,13 @@ 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
 )
 
 // MaxRetry returns an option to specify the max number of times
@@ -93,16 +90,23 @@ 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.
-//
-// Queue name is case-insensitive and the lowercased version is used.
 func Queue(qname string) Option {
-	return queueOption(strings.ToLower(qname))
+	return queueOption(qname)
 }
 
 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) }
 
+// 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
 // will be retried.
@@ -176,18 +180,36 @@ 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) }
+
 // 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
 }
 
 // composeOptions merges user provided options into the default options
@@ -198,6 +220,7 @@ func composeOptions(opts ...Option) (option, error) {
 	res := option{
 		retry:     defaultMaxRetry,
 		queue:     base.DefaultQueueName,
+		taskID:    uuid.NewString(),
 		timeout:   0, // do not set to deafultTimeout here
 		deadline:  time.Time{},
 		processAt: time.Now(),
@@ -207,11 +230,17 @@ func composeOptions(opts ...Option) (option, error) {
 		case retryOption:
 			res.retry = int(opt)
 		case queueOption:
-			trimmed := strings.TrimSpace(string(opt))
+			qname := string(opt)
-			if err := base.ValidateQueueName(trimmed); err != nil {
+			if err := base.ValidateQueueName(qname); err != nil {
 				return option{}, err
 			}
-			res.queue = trimmed
+			res.queue = qname
+		case taskIDOption:
+			id := string(opt)
+			if err := validateTaskID(id); err != nil {
+				return option{}, err
+			}
+			res.taskID = id
 		case timeoutOption:
 			res.timeout = time.Duration(opt)
 		case deadlineOption:
@@ -222,6 +251,8 @@ func composeOptions(opts ...Option) (option, error) {
 			res.processAt = time.Time(opt)
 		case processInOption:
 			res.processAt = time.Now().Add(time.Duration(opt))
+		case retentionOption:
+			res.retention = time.Duration(opt)
 		default:
 			// ignore unexpected option
 		}
@@ -229,6 +260,14 @@ func composeOptions(opts ...Option) (option, error) {
 	return res, nil
 }
 
+// validates user provided task ID string.
+func validateTaskID(id string) error {
+	if strings.TrimSpace(id) == "" {
+		return errors.New("task ID cannot be empty")
+	}
+	return nil
+}
+
 const (
 	// Default max retry count used if nothing is specified.
 	defaultMaxRetry = 25
@@ -243,17 +282,6 @@ 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()
@@ -265,15 +293,16 @@ func (c *Client) Close() 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 deafult, 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.
 func (c *Client) Enqueue(task *Task, opts ...Option) (*TaskInfo, error) {
-	c.mu.Lock()
+	if strings.TrimSpace(task.Type()) == "" {
-	if defaults, ok := c.opts[task.Type()]; ok {
+		return nil, fmt.Errorf("task typename cannot be empty")
-		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
@@ -295,7 +324,7 @@ 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,
@@ -303,6 +332,7 @@ func (c *Client) Enqueue(task *Task, opts ...Option) (*TaskInfo, error) {
 		Deadline:  deadline.Unix(),
 		Timeout:   int64(timeout.Seconds()),
 		UniqueKey: uniqueKey,
+		Retention: int64(opt.retention.Seconds()),
 	}
 	now := time.Now()
 	var state base.TaskState
@@ -317,10 +347,12 @@ func (c *Client) Enqueue(task *Task, opts ...Option) (*TaskInfo, error) {
 	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 {

client_test.go

@@ -5,6 +5,7 @@
 package asynq
 
 import (
+	"context"
 	"errors"
 	"testing"
 	"time"
@@ -287,13 +288,13 @@ func TestClientEnqueue(t *testing.T) {
 			},
 		},
 		{
-			desc: "Queue option should be case-insensitive",
+			desc: "Queue option should be case sensitive",
 			task: task,
 			opts: []Option{
-				Queue("HIGH"),
+				Queue("MyQueue"),
 			},
 			wantInfo: &TaskInfo{
-				Queue:         "high",
+				Queue:         "MyQueue",
 				Type:          task.Type(),
 				Payload:       task.Payload(),
 				State:         TaskStatePending,
@@ -306,12 +307,12 @@ func TestClientEnqueue(t *testing.T) {
 				NextProcessAt: now,
 			},
 			wantPending: map[string][]*base.TaskMessage{
-				"high": {
+				"MyQueue": {
 					{
 						Type:     task.Type(),
 						Payload:  task.Payload(),
 						Retry:    defaultMaxRetry,
-						Queue:    "high",
+						Queue:    "MyQueue",
 						Timeout:  int64(defaultTimeout.Seconds()),
 						Deadline: noDeadline.Unix(),
 					},
@@ -415,6 +416,40 @@ 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 +478,100 @@ func TestClientEnqueue(t *testing.T) {
 	}
 }
 
+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))
@@ -585,6 +714,26 @@ func TestClientEnqueueError(t *testing.T) {
 				Queue(""),
 			},
 		},
+		{
+			desc: "With empty task typename",
+			task: NewTask("", h.JSON(map[string]interface{}{})),
+			opts: []Option{},
+		},
+		{
+			desc: "With blank task typename",
+			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("  ")},
+		},
 	}
 
 	for _, tc := range tests {
@@ -597,16 +746,17 @@ 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
@@ -615,7 +765,8 @@ 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",
@@ -643,7 +794,8 @@ 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",
@@ -671,7 +823,8 @@ 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",
@@ -700,8 +853,8 @@ func TestClientDefaultOptions(t *testing.T) {
 		h.FlushDB(t, r)
 		c := NewClient(getRedisConnOpt(t))
 		defer c.Close()
-		c.SetDefaultOptions(tc.task.Type(), tc.defaultOpts...)
+		task := NewTask(tc.tasktype, tc.payload, tc.defaultOpts...)
-		gotInfo, err := c.Enqueue(tc.task, tc.opts...)
+		gotInfo, err := c.Enqueue(task, tc.opts...)
 		if err != nil {
 			t.Fatal(err)
 		}
@@ -751,7 +904,7 @@ 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
@@ -796,7 +949,7 @@ 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)
@@ -842,7 +995,7 @@ func TestClientEnqueueUniqueWithProcessAtOption(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 := tc.at.Add(tc.ttl).Sub(time.Now())
 		if !cmp.Equal(wantTTL.Seconds(), gotTTL.Seconds(), cmpopts.EquateApprox(0, 1)) {
 			t.Errorf("TTL = %v, want %v", gotTTL, wantTTL)

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)
+	return asynqcontext.GetTaskID(ctx)
-	if !ok {
-		return "", false
-	}
-	return metadata.id, true
 }
 
 // GetRetryCount extracts retry count from a context, if any.
@@ -56,11 +23,7 @@ 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)
+	return asynqcontext.GetRetryCount(ctx)
-	if !ok {
-		return 0, false
-	}
-	return metadata.retryCount, true
 }
 
 // GetMaxRetry extracts maximum retry from a context, if any.
@@ -68,20 +31,12 @@ func GetRetryCount(ctx context.Context) (n int, ok bool) {
 // Return value n indicates the maximum number of times the assoicated 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)
+	return asynqcontext.GetMaxRetry(ctx)
-	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)
+	return asynqcontext.GetQueueName(ctx)
-	if !ok {
-		return "", false
-	}
-	return metadata.qname, true
 }

go.mod

@@ -3,15 +3,17 @@ module github.com/hibiken/asynq
 go 1.13
 
 require (
-	github.com/go-redis/redis/v7 v7.4.0
+	github.com/go-redis/redis/v8 v8.11.2
-	github.com/golang/protobuf v1.4.1
+	github.com/golang/protobuf v1.4.2
-	github.com/google/go-cmp v0.5.0
+	github.com/google/go-cmp v0.5.6
 	github.com/google/uuid v1.2.0
+	github.com/kr/pretty v0.1.0 // indirect
 	github.com/robfig/cron/v3 v3.0.1
 	github.com/spf13/cast v1.3.1
+	github.com/stretchr/testify v1.6.1 // indirect
 	go.uber.org/goleak v0.10.0
-	golang.org/x/sys v0.0.0-20191204072324-ce4227a45e2e
+	golang.org/x/sys v0.0.0-20210112080510-489259a85091
 	golang.org/x/time v0.0.0-20190308202827-9d24e82272b4
 	google.golang.org/protobuf v1.25.0
-	gopkg.in/yaml.v2 v2.2.7 // indirect
+	gopkg.in/check.v1 v1.0.0-20190902080502-41f04d3bba15 // indirect
 )

go.sum

@@ -1,91 +1,129 @@
+cloud.google.com/go v0.26.0 h1:e0WKqKTd5BnrG8aKH3J3h+QvEIQtSUcf2n5UZ5ZgLtQ=
 cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
+github.com/BurntSushi/toml v0.3.1 h1:WXkYYl6Yr3qBf1K79EBnL4mak0OimBfB0XUf9Vl28OQ=
 github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
+github.com/census-instrumentation/opencensus-proto v0.2.1 h1:glEXhBS5PSLLv4IXzLA5yPRVX4bilULVyxxbrfOtDAk=
 github.com/census-instrumentation/opencensus-proto v0.2.1/go.mod h1:f6KPmirojxKA12rnyqOA5BBL4O983OfeGPqjHWSTneU=
+github.com/cespare/xxhash/v2 v2.1.1 h1:6MnRN8NT7+YBpUIWxHtefFZOKTAPgGjpQSxqLNn0+qY=
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 github.com/client9/misspell v0.3.4/go.mod h1:qj6jICC3Q7zFZvVWo7KLAzC3yx5G7kyvSDkc90ppPyw=
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 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=
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 github.com/envoyproxy/go-control-plane v0.9.1-0.20191026205805-5f8ba28d4473/go.mod h1:YTl/9mNaCwkRvm6d1a2C3ymFceY/DCBVvsKhRF0iEA4=
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 github.com/envoyproxy/protoc-gen-validate v0.1.0/go.mod h1:iSmxcyjqTsJpI2R4NaDN7+kN2VEUnK/pcBlmesArF7c=
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 github.com/golang/protobuf v1.4.0/go.mod h1:jodUvKwWbYaEsadDk5Fwe5c77LiNKVO9IDvqG2KuDX0=
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 github.com/golang/protobuf v1.4.1/go.mod h1:U8fpvMrcmy5pZrNK1lt4xCsGvpyWQ/VVv6QDs8UjoX8=
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 github.com/google/go-cmp v0.2.0/go.mod h1:oXzfMopK8JAjlY9xF4vHSVASa0yLyX7SntLO5aqRK0M=
 github.com/google/go-cmp v0.3.0/go.mod h1:8QqcDgzrUqlUb/G2PQTWiueGozuR1884gddMywk6iLU=
 github.com/google/go-cmp v0.3.1/go.mod h1:8QqcDgzrUqlUb/G2PQTWiueGozuR1884gddMywk6iLU=
-github.com/google/go-cmp v0.4.0 h1:xsAVV57WRhGj6kEIi8ReJzQlHHqcBYCElAvkovg3B/4=
 github.com/google/go-cmp v0.4.0/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
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+google.golang.org/grpc v1.27.0 h1:rRYRFMVgRv6E0D70Skyfsr28tDXIuuPZyWGMPdMcnXg=
 google.golang.org/grpc v1.27.0/go.mod h1:qbnxyOmOxrQa7FizSgH+ReBfzJrCY1pSN7KXBS8abTk=
 google.golang.org/protobuf v0.0.0-20200109180630-ec00e32a8dfd/go.mod h1:DFci5gLYBciE7Vtevhsrf46CRTquxDuWsQurQQe4oz8=
 google.golang.org/protobuf v0.0.0-20200221191635-4d8936d0db64/go.mod h1:kwYJMbMJ01Woi6D6+Kah6886xMZcty6N08ah7+eCXa0=
@@ -109,6 +156,7 @@ 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=
 google.golang.org/protobuf v1.21.0/go.mod h1:47Nbq4nVaFHyn7ilMalzfO3qCViNmqZ2kzikPIcrTAo=
 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=
@@ -119,10 +167,11 @@ gopkg.in/fsnotify.v1 v1.4.7 h1:xOHLXZwVvI9hhs+cLKq5+I5onOuwQLhQwiu63xxlHs4=
 gopkg.in/fsnotify.v1 v1.4.7/go.mod h1:Tz8NjZHkW78fSQdbUxIjBTcgA1z1m8ZHf0WmKUhAMys=
 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 v2.2.1 h1:mUhvW9EsL+naU5Q3cakzfE91YhliOondGd6ZrsDBHQE=
-gopkg.in/yaml.v2 v2.2.1/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 v2.3.0 h1:clyUAQHOM3G0M3f5vQj7LuJrETvjVot3Z5el9nffUtU=
-gopkg.in/yaml.v2 v2.2.7/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
+gopkg.in/yaml.v2 v2.3.0/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
+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 v0.0.0-20190523083050-ea95bdfd59fc h1:/hemPrYIhOhy8zYrNj+069zDB68us2sMGsfkFJO0iZs=
 honnef.co/go/tools v0.0.0-20190523083050-ea95bdfd59fc/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=

heartbeat.go

@@ -125,10 +125,10 @@ 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)
 			}
 		}
 	}()

inspector.go

@@ -10,8 +10,7 @@ import (
 	"strings"
 	"time"
 
-	"github.com/go-redis/redis/v7"
+	"github.com/go-redis/redis/v8"
-	"github.com/google/uuid"
 	"github.com/hibiken/asynq/internal/base"
 	"github.com/hibiken/asynq/internal/errors"
 	"github.com/hibiken/asynq/internal/rdb"
@@ -50,6 +49,7 @@ type QueueInfo struct {
 	Queue string
 
 	// Total number of bytes that the queue and its tasks require to be stored in redis.
+	// It is an approximate memory usage value in bytes since the value is computed by sampling.
 	MemoryUsage int64
 
 	// Size is the total number of tasks in the queue.
@@ -66,6 +66,8 @@ type QueueInfo struct {
 	Retry int
 	// Number of archived tasks.
 	Archived int
+	// Number of stored completed tasks.
+	Completed int
 
 	// Total number of tasks being processed during the given date.
 	// The number includes both succeeded and failed tasks.
@@ -99,6 +101,7 @@ func (i *Inspector) GetQueueInfo(qname string) (*QueueInfo, error) {
 		Scheduled:   stats.Scheduled,
 		Retry:       stats.Retry,
 		Archived:    stats.Archived,
+		Completed:   stats.Completed,
 		Processed:   stats.Processed,
 		Failed:      stats.Failed,
 		Paused:      stats.Paused,
@@ -177,11 +180,7 @@ func (i *Inspector) DeleteQueue(qname string, force bool) error {
 // 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)
+	info, err := i.rdb.GetTaskInfo(qname, id)
-	if err != nil {
-		return nil, fmt.Errorf("asynq: %s is not a valid task id", id)
-	}
-	info, err := i.rdb.GetTaskInfo(qname, taskid)
 	switch {
 	case errors.IsQueueNotFound(err):
 		return nil, fmt.Errorf("asynq: %w", ErrQueueNotFound)
@@ -190,7 +189,7 @@ 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.
@@ -263,17 +262,21 @@ func (i *Inspector) ListPendingTasks(qname string, opts ...ListOption) ([]*TaskI
 	}
 	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(qname, 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 {
+	for _, i := range infos {
-		tasks = append(tasks, newTaskInfo(m, base.TaskStatePending, now))
+		tasks = append(tasks, newTaskInfo(
+			i.Message,
+			i.State,
+			i.NextProcessAt,
+			i.Result,
+		))
 	}
 	return tasks, err
 }
@@ -287,7 +290,7 @@ func (i *Inspector) ListActiveTasks(qname string, opts ...ListOption) ([]*TaskIn
 	}
 	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(qname, pgn)
 	switch {
 	case errors.IsQueueNotFound(err):
 		return nil, fmt.Errorf("asynq: %w", ErrQueueNotFound)
@@ -295,8 +298,13 @@ func (i *Inspector) ListActiveTasks(qname string, opts ...ListOption) ([]*TaskIn
 		return nil, fmt.Errorf("asynq: %v", err)
 	}
 	var tasks []*TaskInfo
-	for _, m := range msgs {
+	for _, i := range infos {
-		tasks = append(tasks, newTaskInfo(m, base.TaskStateActive, time.Time{}))
+		tasks = append(tasks, newTaskInfo(
+			i.Message,
+			i.State,
+			i.NextProcessAt,
+			i.Result,
+		))
 	}
 	return tasks, err
 }
@@ -311,7 +319,7 @@ func (i *Inspector) ListScheduledTasks(qname string, opts ...ListOption) ([]*Tas
 	}
 	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(qname, pgn)
 	switch {
 	case errors.IsQueueNotFound(err):
 		return nil, fmt.Errorf("asynq: %w", ErrQueueNotFound)
@@ -319,11 +327,12 @@ 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,
+			i.Message,
-			base.TaskStateScheduled,
+			i.State,
-			time.Unix(z.Score, 0),
+			i.NextProcessAt,
+			i.Result,
 		))
 	}
 	return tasks, nil
@@ -339,7 +348,7 @@ func (i *Inspector) ListRetryTasks(qname string, opts ...ListOption) ([]*TaskInf
 	}
 	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(qname, pgn)
 	switch {
 	case errors.IsQueueNotFound(err):
 		return nil, fmt.Errorf("asynq: %w", ErrQueueNotFound)
@@ -347,11 +356,12 @@ 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,
+			i.Message,
-			base.TaskStateRetry,
+			i.State,
-			time.Unix(z.Score, 0),
+			i.NextProcessAt,
+			i.Result,
 		))
 	}
 	return tasks, nil
@@ -367,7 +377,7 @@ func (i *Inspector) ListArchivedTasks(qname string, opts ...ListOption) ([]*Task
 	}
 	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(qname, pgn)
 	switch {
 	case errors.IsQueueNotFound(err):
 		return nil, fmt.Errorf("asynq: %w", ErrQueueNotFound)
@@ -375,11 +385,41 @@ 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,
+			i.Message,
-			base.TaskStateArchived,
+			i.State,
-			time.Time{},
+			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(qname string, opts ...ListOption) ([]*TaskInfo, error) {
+	if err := base.ValidateQueueName(qname); 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(qname, 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
@@ -425,6 +465,16 @@ func (i *Inspector) DeleteAllArchivedTasks(qname string) (int, error) {
 	return int(n), err
 }
 
+// DeleteAllCompletedTasks deletes all completed tasks from the specified queue,
+// and reports the number tasks deleted.
+func (i *Inspector) DeleteAllCompletedTasks(qname string) (int, error) {
+	if err := base.ValidateQueueName(qname); err != nil {
+		return 0, err
+	}
+	n, err := i.rdb.DeleteAllCompletedTasks(qname)
+	return int(n), err
+}
+
 // DeleteTask deletes a task with the given id from the given queue.
 // The task needs to be in pending, scheduled, retry, or archived state,
 // otherwise DeleteTask will return an error.
@@ -436,11 +486,7 @@ func (i *Inspector) DeleteTask(qname, id string) error {
 	if err := base.ValidateQueueName(qname); err != nil {
 		return fmt.Errorf("asynq: %v", err)
 	}
-	taskid, err := uuid.Parse(id)
+	err := i.rdb.DeleteTask(qname, id)
-	if err != nil {
-		return fmt.Errorf("asynq: %s is not a valid task id", id)
-	}
-	err = i.rdb.DeleteTask(qname, taskid)
 	switch {
 	case errors.IsQueueNotFound(err):
 		return fmt.Errorf("asynq: %w", ErrQueueNotFound)
@@ -494,11 +540,7 @@ func (i *Inspector) RunTask(qname, id string) error {
 	if err := base.ValidateQueueName(qname); err != nil {
 		return fmt.Errorf("asynq: %v", err)
 	}
-	taskid, err := uuid.Parse(id)
+	err := i.rdb.RunTask(qname, id)
-	if err != nil {
-		return fmt.Errorf("asynq: %s is not a valid task id", id)
-	}
-	err = i.rdb.RunTask(qname, taskid)
 	switch {
 	case errors.IsQueueNotFound(err):
 		return fmt.Errorf("asynq: %w", ErrQueueNotFound)
@@ -551,11 +593,7 @@ func (i *Inspector) ArchiveTask(qname, id string) error {
 	if err := base.ValidateQueueName(qname); err != nil {
 		return fmt.Errorf("asynq: err")
 	}
-	taskid, err := uuid.Parse(id)
+	err := i.rdb.ArchiveTask(qname, id)
-	if err != nil {
-		return fmt.Errorf("asynq: %s is not a valid task id", id)
-	}
-	err = i.rdb.ArchiveTask(qname, taskid)
 	switch {
 	case errors.IsQueueNotFound(err):
 		return fmt.Errorf("asynq: %w", ErrQueueNotFound)
@@ -806,6 +844,12 @@ 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

@@ -5,6 +5,7 @@
 package asynq
 
 import (
+	"context"
 	"errors"
 	"fmt"
 	"math"
@@ -37,7 +38,7 @@ 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)
 			}
 		}
@@ -136,7 +137,7 @@ 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)
 		}
 	}
@@ -275,6 +276,7 @@ func TestInspectorGetQueueInfo(t *testing.T) {
 		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
 		qname     string
@@ -309,6 +311,11 @@ func TestInspectorGetQueueInfo(t *testing.T) {
 				"critical": {},
 				"low":      {},
 			},
+			completed: map[string][]base.Z{
+				"default":  {},
+				"critical": {},
+				"low":      {},
+			},
 			processed: map[string]int{
 				"default":  120,
 				"critical": 100,
@@ -328,6 +335,7 @@ func TestInspectorGetQueueInfo(t *testing.T) {
 				Scheduled: 2,
 				Retry:     0,
 				Archived:  0,
+				Completed: 0,
 				Processed: 120,
 				Failed:    2,
 				Paused:    false,
@@ -343,13 +351,14 @@ 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)
 		for qname, n := range tc.processed {
 			processedKey := base.ProcessedKey(qname, now)
-			r.Set(processedKey, n, 0)
+			r.Set(context.Background(), processedKey, n, 0)
 		}
 		for qname, n := range tc.failed {
 			failedKey := base.FailedKey(qname, now)
-			r.Set(failedKey, n, 0)
+			r.Set(context.Background(), failedKey, n, 0)
 		}
 
 		got, err := inspector.GetQueueInfo(tc.qname)
@@ -385,14 +394,14 @@ 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(context.Background(), processedKey, (i+1)*1000, 0)
-			r.Set(failedKey, (i+1)*10, 0)
+			r.Set(context.Background(), failedKey, (i+1)*10, 0)
 		}
 
 		got, err := inspector.History(tc.qname, tc.n)
@@ -423,7 +432,7 @@ 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 +492,52 @@ 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 +616,7 @@ func TestInspectorGetTaskInfoError(t *testing.T) {
 	}{
 		{
 			qname:   "nonexistent",
-			id:      m1.ID.String(),
+			id:      m1.ID,
 			wantErr: ErrQueueNotFound,
 		},
 		{
@@ -721,8 +735,8 @@ func TestInspectorListActiveTasks(t *testing.T) {
 			},
 			qname: "default",
 			want: []*TaskInfo{
-				newTaskInfo(m1, base.TaskStateActive, time.Time{}),
+				newTaskInfo(m1, base.TaskStateActive, time.Time{}, nil),
-				newTaskInfo(m2, base.TaskStateActive, time.Time{}),
+				newTaskInfo(m2, base.TaskStateActive, time.Time{}, nil),
 			},
 		},
 	}
@@ -748,6 +762,7 @@ func createScheduledTask(z base.Z) *TaskInfo {
 		z.Message,
 		base.TaskStateScheduled,
 		time.Unix(z.Score, 0),
+		nil,
 	)
 }
 
@@ -817,6 +832,7 @@ func createRetryTask(z base.Z) *TaskInfo {
 		z.Message,
 		base.TaskStateRetry,
 		time.Unix(z.Score, 0),
+		nil,
 	)
 }
 
@@ -887,6 +903,7 @@ func createArchivedTask(z base.Z) *TaskInfo {
 		z.Message,
 		base.TaskStateArchived,
 		time.Time{}, // zero value for n/a
+		nil,
 	)
 }
 
@@ -951,6 +968,83 @@ 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 TestInspectorListPagination(t *testing.T) {
 	// Create 100 tasks.
 	var msgs []*base.TaskMessage
@@ -1049,6 +1143,9 @@ 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)
+		}
 	}
 }
 
@@ -1314,6 +1411,72 @@ 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()
@@ -3033,6 +3196,7 @@ 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 +3228,7 @@ 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")

internal/asynqtest/asynqtest.go

@@ -6,13 +6,14 @@
 package asynqtest
 
 import (
+	"context"
 	"encoding/json"
 	"math"
 	"sort"
 	"testing"
 	"time"
 
-	"github.com/go-redis/redis/v7"
+	"github.com/go-redis/redis/v8"
 	"github.com/google/go-cmp/cmp"
 	"github.com/google/go-cmp/cmp/cmpopts"
 	"github.com/google/uuid"
@@ -31,7 +32,7 @@ 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 +41,7 @@ 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
 })
@@ -103,7 +104,7 @@ 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,
@@ -138,6 +139,12 @@ 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 +172,12 @@ 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 {
+		err := r.ForEachMaster(context.Background(), func(ctx context.Context, c *redis.Client) error {
-			if err := c.FlushAll().Err(); err != nil {
+			if err := c.FlushAll(ctx).Err(); err != nil {
 				return err
 			}
 			return nil
@@ -184,45 +191,52 @@ 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) {
 	tb.Helper()
-	r.SAdd(base.AllQueues, qname)
+	r.SAdd(context.Background(), base.AllQueues, qname)
 	seedRedisZSet(tb, r, base.DeadlinesKey(qname), entries, base.TaskStateActive)
 }
 
+// SeedCompletedQueue initializes the completed set witht 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)
+}
+
 // SeedAllPendingQueues initializes all of the specified queues with the given messages.
 //
 // pending maps a queue name to a list of messages.
@@ -273,15 +287,23 @@ func SeedAllDeadlines(tb testing.TB, r redis.UniversalClient, deadlines map[stri
 	}
 }
 
+// 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)
+	}
+}
+
 func seedRedisList(tb testing.TB, c redis.UniversalClient, key string,
 	msgs []*base.TaskMessage, state base.TaskState) {
 	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())
+		key := base.TaskKey(msg.Queue, msg.ID)
 		data := map[string]interface{}{
 			"msg":        encoded,
 			"state":      state.String(),
@@ -289,11 +311,11 @@ func seedRedisList(tb testing.TB, c redis.UniversalClient, key string,
 			"deadline":   msg.Deadline,
 			"unique_key": msg.UniqueKey,
 		}
-		if err := c.HSet(key, data).Err(); err != nil {
+		if err := c.HSet(context.Background(), key, 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)
 			}
@@ -307,11 +329,11 @@ 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)}
+		z := &redis.Z{Member: msg.ID, Score: float64(item.Score)}
-		if err := c.ZAdd(key, z).Err(); err != nil {
+		if err := c.ZAdd(context.Background(), key, z).Err(); err != nil {
 			tb.Fatal(err)
 		}
-		key := base.TaskKey(msg.Queue, msg.ID.String())
+		key := base.TaskKey(msg.Queue, msg.ID)
 		data := map[string]interface{}{
 			"msg":        encoded,
 			"state":      state.String(),
@@ -319,11 +341,11 @@ func seedRedisZSet(tb testing.TB, c redis.UniversalClient, key string,
 			"deadline":   msg.Deadline,
 			"unique_key": msg.UniqueKey,
 		}
-		if err := c.HSet(key, data).Err(); err != nil {
+		if err := c.HSet(context.Background(), key, 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 +388,13 @@ 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 {
@@ -394,17 +423,24 @@ func GetDeadlinesEntries(tb testing.TB, r redis.UniversalClient, qname string) [
 	return getMessagesFromZSetWithScores(tb, r, qname, base.DeadlinesKey, 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)
+}
+
 // 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 +451,13 @@ 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)
 		}
 	}
@@ -432,14 +468,14 @@ 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)
 		}
 	}

internal/base/base.go

@@ -10,19 +10,19 @@ import (
 	"crypto/md5"
 	"encoding/hex"
 	"fmt"
+	"strings"
 	"sync"
 	"time"
 
-	"github.com/go-redis/redis/v7"
+	"github.com/go-redis/redis/v8"
 	"github.com/golang/protobuf/ptypes"
-	"github.com/google/uuid"
 	"github.com/hibiken/asynq/internal/errors"
 	pb "github.com/hibiken/asynq/internal/proto"
 	"google.golang.org/protobuf/proto"
 )
 
 // Version of asynq library and CLI.
-const Version = "0.18.1"
+const Version = "0.19.0"
 
 // DefaultQueueName is the queue name used if none are specified by user.
 const DefaultQueueName = "default"
@@ -48,6 +48,7 @@ const (
 	TaskStateScheduled
 	TaskStateRetry
 	TaskStateArchived
+	TaskStateCompleted
 )
 
 func (s TaskState) String() string {
@@ -62,6 +63,8 @@ func (s TaskState) String() string {
 		return "retry"
 	case TaskStateArchived:
 		return "archived"
+	case TaskStateCompleted:
+		return "completed"
 	}
 	panic(fmt.Sprintf("internal error: unknown task state %d", s))
 }
@@ -78,6 +81,8 @@ func TaskStateFromString(s string) (TaskState, error) {
 		return TaskStateRetry, nil
 	case "archived":
 		return TaskStateArchived, nil
+	case "completed":
+		return TaskStateCompleted, nil
 	}
 	return 0, errors.E(errors.FailedPrecondition, fmt.Sprintf("%q is not supported task state", s))
 }
@@ -85,7 +90,7 @@ func TaskStateFromString(s string) (TaskState, error) {
 // ValidateQueueName validates a given qname to be used as a queue name.
 // Returns nil if valid, otherwise returns non-nil error.
 func ValidateQueueName(qname string) error {
-	if len(qname) == 0 {
+	if len(strings.TrimSpace(qname)) == 0 {
 		return fmt.Errorf("queue name must contain one or more characters")
 	}
 	return nil
@@ -136,6 +141,10 @@ func DeadlinesKey(qname string) string {
 	return fmt.Sprintf("%sdeadlines", QueueKeyPrefix(qname))
 }
 
+func CompletedKey(qname string) string {
+	return fmt.Sprintf("%scompleted", QueueKeyPrefix(qname))
+}
+
 // PausedKey returns a redis key to indicate that the given queue is paused.
 func PausedKey(qname string) string {
 	return fmt.Sprintf("%spaused", QueueKeyPrefix(qname))
@@ -190,7 +199,7 @@ 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
@@ -229,6 +238,15 @@ type TaskMessage struct {
 	//
 	// Empty string indicates that no uniqueness lock was used.
 	UniqueKey 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.
@@ -239,7 +257,7 @@ 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),
@@ -248,6 +266,8 @@ func EncodeMessage(msg *TaskMessage) ([]byte, error) {
 		Timeout:      msg.Timeout,
 		Deadline:     msg.Deadline,
 		UniqueKey:    msg.UniqueKey,
+		Retention:    msg.Retention,
+		CompletedAt:  msg.CompletedAt,
 	})
 }
 
@@ -260,7 +280,7 @@ 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()),
@@ -269,6 +289,8 @@ func DecodeMessage(data []byte) (*TaskMessage, error) {
 		Timeout:      pbmsg.GetTimeout(),
 		Deadline:     pbmsg.GetDeadline(),
 		UniqueKey:    pbmsg.GetUniqueKey(),
+		Retention:    pbmsg.GetRetention(),
+		CompletedAt:  pbmsg.GetCompletedAt(),
 	}, nil
 }
 
@@ -277,6 +299,7 @@ type TaskInfo struct {
 	Message       *TaskMessage
 	State         TaskState
 	NextProcessAt time.Time
+	Result        []byte
 }
 
 // Z represents sorted set member.
@@ -641,16 +664,19 @@ type Broker interface {
 	EnqueueUnique(msg *TaskMessage, ttl time.Duration) error
 	Dequeue(qnames ...string) (*TaskMessage, time.Time, error)
 	Done(msg *TaskMessage) error
+	MarkAsComplete(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
+	Retry(msg *TaskMessage, processAt time.Time, errMsg string, isFailure bool) error
 	Archive(msg *TaskMessage, errMsg string) error
 	ForwardIfReady(qnames ...string) error
+	DeleteExpiredCompletedTasks(qname string) error
 	ListDeadlineExceeded(deadline time.Time, qnames ...string) ([]*TaskMessage, error)
 	WriteServerState(info *ServerInfo, workers []*WorkerInfo, ttl time.Duration) error
 	ClearServerState(host string, pid int, serverID string) error
 	CancelationPubSub() (*redis.PubSub, error) // TODO: Need to decouple from redis to support other brokers
 	PublishCancelation(id string) error
+	WriteResult(qname, id string, data []byte) (n int, err error)
 	Close() error
 }

internal/base/base_test.go

@@ -139,6 +139,23 @@ 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
@@ -344,7 +361,7 @@ func TestUniqueKey(t *testing.T) {
 }
 
 func TestMessageEncoding(t *testing.T) {
-	id := uuid.New()
+	id := uuid.NewString()
 	tests := []struct {
 		in  *TaskMessage
 		out *TaskMessage
@@ -359,6 +376,7 @@ func TestMessageEncoding(t *testing.T) {
 				Retried:   0,
 				Timeout:   1800,
 				Deadline:  1692311100,
+				Retention: 3600,
 			},
 			out: &TaskMessage{
 				Type:      "task1",
@@ -369,6 +387,7 @@ func TestMessageEncoding(t *testing.T) {
 				Retried:   0,
 				Timeout:   1800,
 				Deadline:  1692311100,
+				Retention: 3600,
 			},
 		},
 	}

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(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(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
+}
+
+// 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 assoicated 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

@@ -2,7 +2,7 @@
 // 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"
@@ -24,12 +24,11 @@ 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(msg, tc.deadline)
-
 		select {
 		case x := <-ctx.Done():
 			t.Errorf("<-ctx.Done() == %v, want nothing (it should block)", x)
@@ -64,11 +63,11 @@ 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(msg, tc.deadline)
 		defer cancel()
 
 		select {
@@ -92,21 +91,21 @@ 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 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.New(), Retry: 10, Retried: 5, 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.New(), Retry: 25, Retried: 0, Timeout: 1800, Queue: "custom"}},
+		{"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(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() {
+		if ok && id != tc.msg.ID {
-			t.Errorf("%s: GetTaskID(ctx) returned id == %q, want %q", tc.desc, id, tc.msg.ID.String())
+			t.Errorf("%s: GetTaskID(ctx) returned id == %q, want %q", tc.desc, id, tc.msg.ID)
 		}
 
 		retried, ok := GetRetryCount(ctx)

internal/errors/errors.go

@@ -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

internal/proto/asynq.pb.go

@@ -5,7 +5,7 @@
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
 // 	protoc-gen-go v1.25.0
-// 	protoc        v3.14.0
+// 	protoc        v3.17.3
 // source: asynq.proto
 
 package proto
@@ -65,6 +65,14 @@ 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"`
+	// 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 +184,20 @@ func (x *TaskMessage) GetUniqueKey() string {
 	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 +614,7 @@ 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, 0xea, 0x02, 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 +633,84 @@ 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,
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+	0x79, 0x12, 0x1c, 0x0a, 0x09, 0x72, 0x65, 0x74, 0x65, 0x6e, 0x74, 0x69, 0x6f, 0x6e, 0x18, 0x0c,
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+	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 (

internal/proto/asynq.proto

@@ -51,6 +51,15 @@ message TaskMessage {
 	// Empty string indicates that no uniqueness lock was used.
   string unique_key = 10;
 
+  // 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.

internal/rdb/benchmark_test.go

@@ -184,7 +184,7 @@ func BenchmarkRetry(b *testing.B) {
 		asynqtest.SeedDeadlines(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(msgs[0], time.Now().Add(1*time.Minute), "error", true /*isFailure*/); err != nil {
 			b.Fatalf("Retry failed: %v", err)
 		}
 	}

internal/rdb/inspect.go

@@ -5,12 +5,12 @@
 package rdb
 
 import (
+	"context"
 	"fmt"
 	"strings"
 	"time"
 
-	"github.com/go-redis/redis/v7"
+	"github.com/go-redis/redis/v8"
-	"github.com/google/uuid"
 	"github.com/hibiken/asynq/internal/base"
 	"github.com/hibiken/asynq/internal/errors"
 	"github.com/spf13/cast"
@@ -18,7 +18,7 @@ import (
 
 // AllQueues returns a list of all queue names.
 func (r *RDB) AllQueues() ([]string, error) {
-	return r.client.SMembers(base.AllQueues).Result()
+	return r.client.SMembers(context.Background(), base.AllQueues).Result()
 }
 
 // Stats represents a state of queues at a certain time.
@@ -26,7 +26,8 @@ type Stats struct {
 	// Name of the queue (e.g. "default", "critical").
 	Queue string
 	// MemoryUsage is the total number of bytes the queue and its tasks require
-	// to be stored in redis.
+	// to be stored in redis. It is an approximate memory usage value in bytes
+	// since the value is computed by sampling.
 	MemoryUsage int64
 	// Paused indicates whether the queue is paused.
 	// If true, tasks in the queue should not be processed.
@@ -39,6 +40,7 @@ type Stats struct {
 	Scheduled int
 	Retry     int
 	Archived  int
+	Completed int
 	// Total number of tasks processed during the current date.
 	// The number includes both succeeded and failed tasks.
 	Processed int
@@ -66,9 +68,10 @@ type DailyStats struct {
 // KEYS[3] -> asynq:<qname>:scheduled
 // KEYS[4] -> asynq:<qname>:retry
 // KEYS[5] -> asynq:<qname>:archived
-// KEYS[6] -> asynq:<qname>:processed:<yyyy-mm-dd>
+// KEYS[6] -> asynq:<qname>:completed
-// KEYS[7] -> asynq:<qname>:failed:<yyyy-mm-dd>
+// KEYS[7] -> asynq:<qname>:processed:<yyyy-mm-dd>
-// KEYS[8] -> asynq:<qname>:paused
+// KEYS[8] -> asynq:<qname>:failed:<yyyy-mm-dd>
+// KEYS[9] -> asynq:<qname>:paused
 var currentStatsCmd = redis.NewScript(`
 local res = {}
 table.insert(res, KEYS[1])
@@ -81,28 +84,30 @@ table.insert(res, KEYS[4])
 table.insert(res, redis.call("ZCARD", KEYS[4]))
 table.insert(res, KEYS[5])
 table.insert(res, redis.call("ZCARD", KEYS[5]))
+table.insert(res, KEYS[6])
+table.insert(res, redis.call("ZCARD", KEYS[6]))
 local pcount = 0
-local p = redis.call("GET", KEYS[6])
+local p = redis.call("GET", KEYS[7])
 if p then
 	pcount = tonumber(p) 
 end
-table.insert(res, KEYS[6])
+table.insert(res, KEYS[7])
 table.insert(res, pcount)
 local fcount = 0
-local f = redis.call("GET", KEYS[7])
+local f = redis.call("GET", KEYS[8])
 if f then
 	fcount = tonumber(f)
 end
-table.insert(res, KEYS[7])
-table.insert(res, fcount)
 table.insert(res, KEYS[8])
-table.insert(res, redis.call("EXISTS", KEYS[8]))
+table.insert(res, fcount)
+table.insert(res, KEYS[9])
+table.insert(res, redis.call("EXISTS", KEYS[9]))
 return res`)
 
 // CurrentStats returns a current state of the queues.
 func (r *RDB) CurrentStats(qname string) (*Stats, error) {
 	var op errors.Op = "rdb.CurrentStats"
-	exists, err := r.client.SIsMember(base.AllQueues, qname).Result()
+	exists, err := r.queueExists(qname)
 	if err != nil {
 		return nil, errors.E(op, errors.Unknown, err)
 	}
@@ -110,12 +115,13 @@ func (r *RDB) CurrentStats(qname string) (*Stats, error) {
 		return nil, errors.E(op, errors.NotFound, &errors.QueueNotFoundError{Queue: qname})
 	}
 	now := time.Now()
-	res, err := currentStatsCmd.Run(r.client, []string{
+	res, err := currentStatsCmd.Run(context.Background(), r.client, []string{
 		base.PendingKey(qname),
 		base.ActiveKey(qname),
 		base.ScheduledKey(qname),
 		base.RetryKey(qname),
 		base.ArchivedKey(qname),
+		base.CompletedKey(qname),
 		base.ProcessedKey(qname, now),
 		base.FailedKey(qname, now),
 		base.PausedKey(qname),
@@ -151,6 +157,9 @@ func (r *RDB) CurrentStats(qname string) (*Stats, error) {
 		case base.ArchivedKey(qname):
 			stats.Archived = val
 			size += val
+		case base.CompletedKey(qname):
+			stats.Completed = val
+			size += val
 		case base.ProcessedKey(qname, now):
 			stats.Processed = val
 		case base.FailedKey(qname, now):
@@ -172,31 +181,84 @@ func (r *RDB) CurrentStats(qname string) (*Stats, error) {
 	return stats, nil
 }
 
+// Computes memory usage for the given queue by sampling tasks
+// from each redis list/zset. Returns approximate memory usage value
+// in bytes.
+//
+// KEYS[1] -> asynq:{qname}:active
+// KEYS[2] -> asynq:{qname}:pending
+// KEYS[3] -> asynq:{qname}:scheduled
+// KEYS[4] -> asynq:{qname}:retry
+// KEYS[5] -> asynq:{qname}:archived
+// KEYS[6] -> asynq:{qname}:completed
+//
+// ARGV[1] -> asynq:{qname}:t:
+// ARGV[2] -> sample_size (e.g 20)
+var memoryUsageCmd = redis.NewScript(`
+local sample_size = tonumber(ARGV[2])
+if sample_size <= 0 then
+    return redis.error_reply("sample size must be a positive number")
+end
+local memusg = 0
+for i=1,2 do
+    local ids = redis.call("LRANGE", KEYS[i], 0, sample_size - 1)
+    local sample_total = 0
+    if (table.getn(ids) > 0) then
+        for _, id in ipairs(ids) do
+            local bytes = redis.call("MEMORY", "USAGE", ARGV[1] .. id)
+            sample_total = sample_total + bytes
+        end
+        local n = redis.call("LLEN", KEYS[i])
+        local avg = sample_total / table.getn(ids)
+        memusg = memusg + (avg * n)
+    end
+    local m = redis.call("MEMORY", "USAGE", KEYS[i])
+    if (m) then
+        memusg = memusg + m
+    end
+end
+for i=3,6 do
+    local ids = redis.call("ZRANGE", KEYS[i], 0, sample_size - 1)
+    local sample_total = 0
+    if (table.getn(ids) > 0) then
+        for _, id in ipairs(ids) do
+            local bytes = redis.call("MEMORY", "USAGE", ARGV[1] .. id)
+            sample_total = sample_total + bytes
+        end
+        local n = redis.call("ZCARD", KEYS[i])
+        local avg = sample_total / table.getn(ids)
+        memusg = memusg + (avg * n)
+    end
+    local m = redis.call("MEMORY", "USAGE", KEYS[i])
+    if (m) then
+        memusg = memusg + m
+    end
+end
+return memusg
+`)
+
 func (r *RDB) memoryUsage(qname string) (int64, error) {
 	var op errors.Op = "rdb.memoryUsage"
-	var (
+	const sampleSize = 20
-		keys   []string
+	keys := []string{
-		data   []string
+		base.ActiveKey(qname),
-		cursor uint64
+		base.PendingKey(qname),
-		err    error
+		base.ScheduledKey(qname),
-	)
+		base.RetryKey(qname),
-	for {
+		base.ArchivedKey(qname),
-		data, cursor, err = r.client.Scan(cursor, fmt.Sprintf("asynq:{%s}*", qname), 100).Result()
+		base.CompletedKey(qname),
+	}
+	argv := []interface{}{
+		base.TaskKeyPrefix(qname),
+		sampleSize,
+	}
+	res, err := memoryUsageCmd.Run(context.Background(), r.client, keys, argv...).Result()
 	if err != nil {
-			return 0, errors.E(op, errors.Unknown, &errors.RedisCommandError{Command: "scan", Err: err})
+		return 0, errors.E(op, errors.Unknown, fmt.Sprintf("redis eval error: %v", err))
 	}
-		keys = append(keys, data...)
+	usg, err := cast.ToInt64E(res)
-		if cursor == 0 {
-			break
-		}
-	}
-	var usg int64
-	for _, k := range keys {
-		n, err := r.client.MemoryUsage(k).Result()
 	if err != nil {
-			return 0, errors.E(op, errors.Unknown, &errors.RedisCommandError{Command: "memory usage", Err: err})
+		return 0, errors.E(op, errors.Internal, fmt.Sprintf("could not cast script return value to int64"))
-		}
-		usg += n
 	}
 	return usg, nil
 }
@@ -218,7 +280,7 @@ func (r *RDB) HistoricalStats(qname string, n int) ([]*DailyStats, error) {
 	if n < 1 {
 		return nil, errors.E(op, errors.FailedPrecondition, "the number of days must be positive")
 	}
-	exists, err := r.client.SIsMember(base.AllQueues, qname).Result()
+	exists, err := r.queueExists(qname)
 	if err != nil {
 		return nil, errors.E(op, errors.Unknown, &errors.RedisCommandError{Command: "sismember", Err: err})
 	}
@@ -235,7 +297,7 @@ func (r *RDB) HistoricalStats(qname string, n int) ([]*DailyStats, error) {
 		keys = append(keys, base.ProcessedKey(qname, ts))
 		keys = append(keys, base.FailedKey(qname, ts))
 	}
-	res, err := historicalStatsCmd.Run(r.client, keys).Result()
+	res, err := historicalStatsCmd.Run(context.Background(), r.client, keys).Result()
 	if err != nil {
 		return nil, errors.E(op, errors.Unknown, fmt.Sprintf("redis eval error: %v", err))
 	}
@@ -257,7 +319,7 @@ func (r *RDB) HistoricalStats(qname string, n int) ([]*DailyStats, error) {
 
 // RedisInfo returns a map of redis info.
 func (r *RDB) RedisInfo() (map[string]string, error) {
-	res, err := r.client.Info().Result()
+	res, err := r.client.Info(context.Background()).Result()
 	if err != nil {
 		return nil, err
 	}
@@ -266,7 +328,7 @@ func (r *RDB) RedisInfo() (map[string]string, error) {
 
 // RedisClusterInfo returns a map of redis cluster info.
 func (r *RDB) RedisClusterInfo() (map[string]string, error) {
-	res, err := r.client.ClusterInfo().Result()
+	res, err := r.client.ClusterInfo(context.Background()).Result()
 	if err != nil {
 		return nil, err
 	}
@@ -285,7 +347,8 @@ func parseInfo(infoStr string) (map[string]string, error) {
 	return info, nil
 }
 
-func reverse(x []string) {
+// TODO: Use generics once available.
+func reverse(x []*base.TaskInfo) {
 	for i := len(x)/2 - 1; i >= 0; i-- {
 		opp := len(x) - 1 - i
 		x[i], x[opp] = x[opp], x[i]
@@ -295,7 +358,7 @@ func reverse(x []string) {
 // checkQueueExists verifies whether the queue exists.
 // It returns QueueNotFoundError if queue doesn't exist.
 func (r *RDB) checkQueueExists(qname string) error {
-	exists, err := r.client.SIsMember(base.AllQueues, qname).Result()
+	exists, err := r.queueExists(qname)
 	if err != nil {
 		return errors.E(errors.Unknown, &errors.RedisCommandError{Command: "sismember", Err: err})
 	}
@@ -312,42 +375,43 @@ func (r *RDB) checkQueueExists(qname string) error {
 // ARGV[3] -> queue key prefix (asynq:{<qname>}:)
 //
 // Output:
-// Tuple of {msg, state, nextProcessAt}
+// Tuple of {msg, state, nextProcessAt, result}
 // msg: encoded task message
 // state: string describing the state of the task
 // nextProcessAt: unix time in seconds, zero if not applicable.
+// result: result data associated with the task
 //
 // If the task key doesn't exist, it returns error with a message "NOT FOUND"
 var getTaskInfoCmd = redis.NewScript(`
 	if redis.call("EXISTS", KEYS[1]) == 0 then
 		return redis.error_reply("NOT FOUND")
 	end
-	local msg, state = unpack(redis.call("HMGET", KEYS[1], "msg", "state"))
+	local msg, state, result = unpack(redis.call("HMGET", KEYS[1], "msg", "state", "result"))
 	if state == "scheduled" or state == "retry" then
-		return {msg, state, redis.call("ZSCORE", ARGV[3] .. state, ARGV[1])}
+		return {msg, state, redis.call("ZSCORE", ARGV[3] .. state, ARGV[1]), result}
 	end
 	if state == "pending" then
-		return {msg, state, ARGV[2]}
+		return {msg, state, ARGV[2], result}
 	end
-	return {msg, state, 0}
+	return {msg, state, 0, result}
 `)
 
 // GetTaskInfo returns a TaskInfo describing the task from the given queue.
-func (r *RDB) GetTaskInfo(qname string, id uuid.UUID) (*base.TaskInfo, error) {
+func (r *RDB) GetTaskInfo(qname, id string) (*base.TaskInfo, error) {
 	var op errors.Op = "rdb.GetTaskInfo"
 	if err := r.checkQueueExists(qname); err != nil {
 		return nil, errors.E(op, errors.CanonicalCode(err), err)
 	}
-	keys := []string{base.TaskKey(qname, id.String())}
+	keys := []string{base.TaskKey(qname, id)}
 	argv := []interface{}{
-		id.String(),
+		id,
 		time.Now().Unix(),
 		base.QueueKeyPrefix(qname),
 	}
-	res, err := getTaskInfoCmd.Run(r.client, keys, argv...).Result()
+	res, err := getTaskInfoCmd.Run(context.Background(), r.client, keys, argv...).Result()
 	if err != nil {
 		if err.Error() == "NOT FOUND" {
-			return nil, errors.E(op, errors.NotFound, &errors.TaskNotFoundError{Queue: qname, ID: id.String()})
+			return nil, errors.E(op, errors.NotFound, &errors.TaskNotFoundError{Queue: qname, ID: id})
 		}
 		return nil, errors.E(op, errors.Unknown, err)
 	}
@@ -355,7 +419,7 @@ func (r *RDB) GetTaskInfo(qname string, id uuid.UUID) (*base.TaskInfo, error) {
 	if err != nil {
 		return nil, errors.E(op, errors.Internal, "unexpected value returned from Lua script")
 	}
-	if len(vals) != 3 {
+	if len(vals) != 4 {
 		return nil, errors.E(op, errors.Internal, "unepxected number of values returned from Lua script")
 	}
 	encoded, err := cast.ToStringE(vals[0])
@@ -370,6 +434,10 @@ func (r *RDB) GetTaskInfo(qname string, id uuid.UUID) (*base.TaskInfo, error) {
 	if err != nil {
 		return nil, errors.E(op, errors.Internal, "unexpected value returned from Lua script")
 	}
+	resultStr, err := cast.ToStringE(vals[3])
+	if err != nil {
+		return nil, errors.E(op, errors.Internal, "unexpected value returned from Lua script")
+	}
 	msg, err := base.DecodeMessage([]byte(encoded))
 	if err != nil {
 		return nil, errors.E(op, errors.Internal, "could not decode task message")
@@ -382,10 +450,15 @@ func (r *RDB) GetTaskInfo(qname string, id uuid.UUID) (*base.TaskInfo, error) {
 	if processAtUnix != 0 {
 		nextProcessAt = time.Unix(processAtUnix, 0)
 	}
+	var result []byte
+	if len(resultStr) > 0 {
+		result = []byte(resultStr)
+	}
 	return &base.TaskInfo{
 		Message:       msg,
 		State:         state,
 		NextProcessAt: nextProcessAt,
+		Result:        result,
 	}, nil
 }
 
@@ -408,12 +481,16 @@ func (p Pagination) stop() int64 {
 }
 
 // ListPending returns pending tasks that are ready to be processed.
-func (r *RDB) ListPending(qname string, pgn Pagination) ([]*base.TaskMessage, error) {
+func (r *RDB) ListPending(qname string, pgn Pagination) ([]*base.TaskInfo, error) {
 	var op errors.Op = "rdb.ListPending"
-	if !r.client.SIsMember(base.AllQueues, qname).Val() {
+	exists, err := r.queueExists(qname)
+	if err != nil {
+		return nil, errors.E(op, errors.Unknown, &errors.RedisCommandError{Command: "sismember", Err: err})
+	}
+	if !exists {
 		return nil, errors.E(op, errors.NotFound, &errors.QueueNotFoundError{Queue: qname})
 	}
-	res, err := r.listMessages(base.PendingKey(qname), qname, pgn)
+	res, err := r.listMessages(qname, base.TaskStatePending, pgn)
 	if err != nil {
 		return nil, errors.E(op, errors.CanonicalCode(err), err)
 	}
@@ -421,12 +498,16 @@ func (r *RDB) ListPending(qname string, pgn Pagination) ([]*base.TaskMessage, er
 }
 
 // ListActive returns all tasks that are currently being processed for the given queue.
-func (r *RDB) ListActive(qname string, pgn Pagination) ([]*base.TaskMessage, error) {
+func (r *RDB) ListActive(qname string, pgn Pagination) ([]*base.TaskInfo, error) {
 	var op errors.Op = "rdb.ListActive"
-	if !r.client.SIsMember(base.AllQueues, qname).Val() {
+	exists, err := r.queueExists(qname)
+	if err != nil {
+		return nil, errors.E(op, errors.Unknown, &errors.RedisCommandError{Command: "sismember", Err: err})
+	}
+	if !exists {
 		return nil, errors.E(op, errors.NotFound, &errors.QueueNotFoundError{Queue: qname})
 	}
-	res, err := r.listMessages(base.ActiveKey(qname), qname, pgn)
+	res, err := r.listMessages(qname, base.TaskStateActive, pgn)
 	if err != nil {
 		return nil, errors.E(op, errors.CanonicalCode(err), err)
 	}
@@ -439,21 +520,32 @@ func (r *RDB) ListActive(qname string, pgn Pagination) ([]*base.TaskMessage, err
 // ARGV[3] -> task key prefix
 var listMessagesCmd = redis.NewScript(`
 local ids = redis.call("LRange", KEYS[1], ARGV[1], ARGV[2])
-local res = {}
+local data = {}
 for _, id in ipairs(ids) do
 	local key = ARGV[3] .. id
-	table.insert(res, redis.call("HGET", key, "msg"))
+	local msg, result = unpack(redis.call("HMGET", key, "msg","result"))
+	table.insert(data, msg)
+	table.insert(data, result)
 end
-return res
+return data
 `)
 
-// listMessages returns a list of TaskMessage in Redis list with the given key.
+// listMessages returns a list of TaskInfo in Redis list with the given key.
-func (r *RDB) listMessages(key, qname string, pgn Pagination) ([]*base.TaskMessage, error) {
+func (r *RDB) listMessages(qname string, state base.TaskState, pgn Pagination) ([]*base.TaskInfo, error) {
+	var key string
+	switch state {
+	case base.TaskStateActive:
+		key = base.ActiveKey(qname)
+	case base.TaskStatePending:
+		key = base.PendingKey(qname)
+	default:
+		panic(fmt.Sprintf("unsupported task state: %v", state))
+	}
 	// Note: Because we use LPUSH to redis list, we need to calculate the
 	// correct range and reverse the list to get the tasks with pagination.
 	stop := -pgn.start() - 1
 	start := -pgn.stop() - 1
-	res, err := listMessagesCmd.Run(r.client,
+	res, err := listMessagesCmd.Run(context.Background(), r.client,
 		[]string{key}, start, stop, base.TaskKeyPrefix(qname)).Result()
 	if err != nil {
 		return nil, errors.E(errors.Unknown, err)
@@ -462,27 +554,44 @@ func (r *RDB) listMessages(key, qname string, pgn Pagination) ([]*base.TaskMessa
 	if err != nil {
 		return nil, errors.E(errors.Internal, fmt.Errorf("cast error: Lua script returned unexpected value: %v", res))
 	}
-	reverse(data)
+	var infos []*base.TaskInfo
-	var msgs []*base.TaskMessage
+	for i := 0; i < len(data); i += 2 {
-	for _, s := range data {
+		m, err := base.DecodeMessage([]byte(data[i]))
-		m, err := base.DecodeMessage([]byte(s))
 		if err != nil {
 			continue // bad data, ignore and continue
 		}
-		msgs = append(msgs, m)
+		var res []byte
+		if len(data[i+1]) > 0 {
+			res = []byte(data[i+1])
 		}
-	return msgs, nil
+		var nextProcessAt time.Time
+		if state == base.TaskStatePending {
+			nextProcessAt = time.Now()
+		}
+		infos = append(infos, &base.TaskInfo{
+			Message:       m,
+			State:         state,
+			NextProcessAt: nextProcessAt,
+			Result:        res,
+		})
+	}
+	reverse(infos)
+	return infos, nil
 
 }
 
 // ListScheduled returns all tasks from the given queue that are scheduled
 // to be processed in the future.
-func (r *RDB) ListScheduled(qname string, pgn Pagination) ([]base.Z, error) {
+func (r *RDB) ListScheduled(qname string, pgn Pagination) ([]*base.TaskInfo, error) {
 	var op errors.Op = "rdb.ListScheduled"
-	if !r.client.SIsMember(base.AllQueues, qname).Val() {
+	exists, err := r.queueExists(qname)
+	if err != nil {
+		return nil, errors.E(op, errors.Unknown, &errors.RedisCommandError{Command: "sismember", Err: err})
+	}
+	if !exists {
 		return nil, errors.E(op, errors.NotFound, &errors.QueueNotFoundError{Queue: qname})
 	}
-	res, err := r.listZSetEntries(base.ScheduledKey(qname), qname, pgn)
+	res, err := r.listZSetEntries(qname, base.TaskStateScheduled, pgn)
 	if err != nil {
 		return nil, errors.E(op, errors.CanonicalCode(err), err)
 	}
@@ -491,12 +600,16 @@ func (r *RDB) ListScheduled(qname string, pgn Pagination) ([]base.Z, error) {
 
 // ListRetry returns all tasks from the given queue that have failed before
 // and willl be retried in the future.
-func (r *RDB) ListRetry(qname string, pgn Pagination) ([]base.Z, error) {
+func (r *RDB) ListRetry(qname string, pgn Pagination) ([]*base.TaskInfo, error) {
 	var op errors.Op = "rdb.ListRetry"
-	if !r.client.SIsMember(base.AllQueues, qname).Val() {
+	exists, err := r.queueExists(qname)
+	if err != nil {
+		return nil, errors.E(op, errors.Unknown, &errors.RedisCommandError{Command: "sismember", Err: err})
+	}
+	if !exists {
 		return nil, errors.E(op, errors.NotFound, &errors.QueueNotFoundError{Queue: qname})
 	}
-	res, err := r.listZSetEntries(base.RetryKey(qname), qname, pgn)
+	res, err := r.listZSetEntries(qname, base.TaskStateRetry, pgn)
 	if err != nil {
 		return nil, errors.E(op, errors.CanonicalCode(err), err)
 	}
@@ -504,40 +617,83 @@ func (r *RDB) ListRetry(qname string, pgn Pagination) ([]base.Z, error) {
 }
 
 // ListArchived returns all tasks from the given queue that have exhausted its retry limit.
-func (r *RDB) ListArchived(qname string, pgn Pagination) ([]base.Z, error) {
+func (r *RDB) ListArchived(qname string, pgn Pagination) ([]*base.TaskInfo, error) {
 	var op errors.Op = "rdb.ListArchived"
-	if !r.client.SIsMember(base.AllQueues, qname).Val() {
+	exists, err := r.queueExists(qname)
+	if err != nil {
+		return nil, errors.E(op, errors.Unknown, &errors.RedisCommandError{Command: "sismember", Err: err})
+	}
+	if !exists {
 		return nil, errors.E(op, errors.NotFound, &errors.QueueNotFoundError{Queue: qname})
 	}
-	zs, err := r.listZSetEntries(base.ArchivedKey(qname), qname, pgn)
+	zs, err := r.listZSetEntries(qname, base.TaskStateArchived, pgn)
 	if err != nil {
 		return nil, errors.E(op, errors.CanonicalCode(err), err)
 	}
 	return zs, nil
 }
 
+// ListCompleted returns all tasks from the given queue that have completed successfully.
+func (r *RDB) ListCompleted(qname string, pgn Pagination) ([]*base.TaskInfo, error) {
+	var op errors.Op = "rdb.ListCompleted"
+	exists, err := r.queueExists(qname)
+	if err != nil {
+		return nil, errors.E(op, errors.Unknown, &errors.RedisCommandError{Command: "sismember", Err: err})
+	}
+	if !exists {
+		return nil, errors.E(op, errors.NotFound, &errors.QueueNotFoundError{Queue: qname})
+	}
+	zs, err := r.listZSetEntries(qname, base.TaskStateCompleted, pgn)
+	if err != nil {
+		return nil, errors.E(op, errors.CanonicalCode(err), err)
+	}
+	return zs, nil
+}
+
+// Reports whether a queue with the given name exists.
+func (r *RDB) queueExists(qname string) (bool, error) {
+	return r.client.SIsMember(context.Background(), base.AllQueues, qname).Result()
+}
+
 // KEYS[1] -> key for ids set (e.g. asynq:{<qname>}:scheduled)
 // ARGV[1] -> min
 // ARGV[2] -> max
 // ARGV[3] -> task key prefix
 //
 // Returns an array populated with
-// [msg1, score1, msg2, score2, ..., msgN, scoreN]
+// [msg1, score1, result1, msg2, score2, result2, ..., msgN, scoreN, resultN]
 var listZSetEntriesCmd = redis.NewScript(`
-local res = {}
+local data = {}
 local id_score_pairs = redis.call("ZRANGE", KEYS[1], ARGV[1], ARGV[2], "WITHSCORES")
 for i = 1, table.getn(id_score_pairs), 2 do
-	local key = ARGV[3] .. id_score_pairs[i]
+	local id = id_score_pairs[i]
-	table.insert(res, redis.call("HGET", key, "msg"))
+	local score = id_score_pairs[i+1]
-	table.insert(res, id_score_pairs[i+1])
+	local key = ARGV[3] .. id
+	local msg, res = unpack(redis.call("HMGET", key, "msg", "result"))
+	table.insert(data, msg)
+	table.insert(data, score)
+	table.insert(data, res)
 end
-return res
+return data
 `)
 
 // listZSetEntries returns a list of message and score pairs in Redis sorted-set
 // with the given key.
-func (r *RDB) listZSetEntries(key, qname string, pgn Pagination) ([]base.Z, error) {
+func (r *RDB) listZSetEntries(qname string, state base.TaskState, pgn Pagination) ([]*base.TaskInfo, error) {
-	res, err := listZSetEntriesCmd.Run(r.client, []string{key},
+	var key string
+	switch state {
+	case base.TaskStateScheduled:
+		key = base.ScheduledKey(qname)
+	case base.TaskStateRetry:
+		key = base.RetryKey(qname)
+	case base.TaskStateArchived:
+		key = base.ArchivedKey(qname)
+	case base.TaskStateCompleted:
+		key = base.CompletedKey(qname)
+	default:
+		panic(fmt.Sprintf("unsupported task state: %v", state))
+	}
+	res, err := listZSetEntriesCmd.Run(context.Background(), r.client, []string{key},
 		pgn.start(), pgn.stop(), base.TaskKeyPrefix(qname)).Result()
 	if err != nil {
 		return nil, errors.E(errors.Unknown, err)
@@ -546,8 +702,8 @@ func (r *RDB) listZSetEntries(key, qname string, pgn Pagination) ([]base.Z, erro
 	if err != nil {
 		return nil, errors.E(errors.Internal, fmt.Errorf("cast error: Lua script returned unexpected value: %v", res))
 	}
-	var zs []base.Z
+	var infos []*base.TaskInfo
-	for i := 0; i < len(data); i += 2 {
+	for i := 0; i < len(data); i += 3 {
 		s, err := cast.ToStringE(data[i])
 		if err != nil {
 			return nil, errors.E(errors.Internal, fmt.Errorf("cast error: Lua script returned unexpected value: %v", res))
@@ -556,13 +712,30 @@ func (r *RDB) listZSetEntries(key, qname string, pgn Pagination) ([]base.Z, erro
 		if err != nil {
 			return nil, errors.E(errors.Internal, fmt.Errorf("cast error: Lua script returned unexpected value: %v", res))
 		}
+		resStr, err := cast.ToStringE(data[i+2])
+		if err != nil {
+			return nil, errors.E(errors.Internal, fmt.Errorf("cast error: Lua script returned unexpected value: %v", res))
+		}
 		msg, err := base.DecodeMessage([]byte(s))
 		if err != nil {
 			continue // bad data, ignore and continue
 		}
-		zs = append(zs, base.Z{Message: msg, Score: score})
+		var nextProcessAt time.Time
+		if state == base.TaskStateScheduled || state == base.TaskStateRetry {
+			nextProcessAt = time.Unix(score, 0)
 		}
-	return zs, nil
+		var resBytes []byte
+		if len(resStr) > 0 {
+			resBytes = []byte(resStr)
+		}
+		infos = append(infos, &base.TaskInfo{
+			Message:       msg,
+			State:         state,
+			NextProcessAt: nextProcessAt,
+			Result:        resBytes,
+		})
+	}
+	return infos, nil
 }
 
 // RunAllScheduledTasks enqueues all scheduled tasks from the given queue
@@ -651,20 +824,20 @@ return 1
 // If a queue with the given name doesn't exist, it returns QueueNotFoundError.
 // If a task with the given id doesn't exist in the queue, it returns TaskNotFoundError
 // If a task is in active or pending state it returns non-nil error with Code FailedPrecondition.
-func (r *RDB) RunTask(qname string, id uuid.UUID) error {
+func (r *RDB) RunTask(qname, id string) error {
 	var op errors.Op = "rdb.RunTask"
 	if err := r.checkQueueExists(qname); err != nil {
 		return errors.E(op, errors.CanonicalCode(err), err)
 	}
 	keys := []string{
-		base.TaskKey(qname, id.String()),
+		base.TaskKey(qname, id),
 		base.PendingKey(qname),
 	}
 	argv := []interface{}{
-		id.String(),
+		id,
 		base.QueueKeyPrefix(qname),
 	}
-	res, err := runTaskCmd.Run(r.client, keys, argv...).Result()
+	res, err := runTaskCmd.Run(context.Background(), r.client, keys, argv...).Result()
 	if err != nil {
 		return errors.E(op, errors.Unknown, err)
 	}
@@ -676,7 +849,7 @@ func (r *RDB) RunTask(qname string, id uuid.UUID) error {
 	case 1:
 		return nil
 	case 0:
-		return errors.E(op, errors.NotFound, &errors.TaskNotFoundError{Queue: qname, ID: id.String()})
+		return errors.E(op, errors.NotFound, &errors.TaskNotFoundError{Queue: qname, ID: id})
 	case -1:
 		return errors.E(op, errors.FailedPrecondition, "task is already running")
 	case -2:
@@ -717,7 +890,7 @@ func (r *RDB) runAll(zset, qname string) (int64, error) {
 	argv := []interface{}{
 		base.TaskKeyPrefix(qname),
 	}
-	res, err := runAllCmd.Run(r.client, keys, argv...).Result()
+	res, err := runAllCmd.Run(context.Background(), r.client, keys, argv...).Result()
 	if err != nil {
 		return 0, err
 	}
@@ -805,7 +978,7 @@ func (r *RDB) ArchiveAllPendingTasks(qname string) (int64, error) {
 		maxArchiveSize,
 		base.TaskKeyPrefix(qname),
 	}
-	res, err := archiveAllPendingCmd.Run(r.client, keys, argv...).Result()
+	res, err := archiveAllPendingCmd.Run(context.Background(), r.client, keys, argv...).Result()
 	if err != nil {
 		return 0, errors.E(op, errors.Internal, err)
 	}
@@ -869,24 +1042,24 @@ return 1
 // If a task with the given id doesn't exist in the queue, it returns TaskNotFoundError
 // If a task is already archived, it returns TaskAlreadyArchivedError.
 // If a task is in active state it returns non-nil error with FailedPrecondition code.
-func (r *RDB) ArchiveTask(qname string, id uuid.UUID) error {
+func (r *RDB) ArchiveTask(qname, id string) error {
 	var op errors.Op = "rdb.ArchiveTask"
 	if err := r.checkQueueExists(qname); err != nil {
 		return errors.E(op, errors.CanonicalCode(err), err)
 	}
 	keys := []string{
-		base.TaskKey(qname, id.String()),
+		base.TaskKey(qname, id),
 		base.ArchivedKey(qname),
 	}
 	now := time.Now()
 	argv := []interface{}{
-		id.String(),
+		id,
 		now.Unix(),
 		now.AddDate(0, 0, -archivedExpirationInDays).Unix(),
 		maxArchiveSize,
 		base.QueueKeyPrefix(qname),
 	}
-	res, err := archiveTaskCmd.Run(r.client, keys, argv...).Result()
+	res, err := archiveTaskCmd.Run(context.Background(), r.client, keys, argv...).Result()
 	if err != nil {
 		return errors.E(op, errors.Unknown, err)
 	}
@@ -898,9 +1071,9 @@ func (r *RDB) ArchiveTask(qname string, id uuid.UUID) error {
 	case 1:
 		return nil
 	case 0:
-		return errors.E(op, errors.NotFound, &errors.TaskNotFoundError{Queue: qname, ID: id.String()})
+		return errors.E(op, errors.NotFound, &errors.TaskNotFoundError{Queue: qname, ID: id})
 	case -1:
-		return errors.E(op, errors.FailedPrecondition, &errors.TaskAlreadyArchivedError{Queue: qname, ID: id.String()})
+		return errors.E(op, errors.FailedPrecondition, &errors.TaskAlreadyArchivedError{Queue: qname, ID: id})
 	case -2:
 		return errors.E(op, errors.FailedPrecondition, "cannot archive task in active state. use CancelTask instead.")
 	case -3:
@@ -951,7 +1124,7 @@ func (r *RDB) archiveAll(src, dst, qname string) (int64, error) {
 		base.TaskKeyPrefix(qname),
 		qname,
 	}
-	res, err := archiveAllCmd.Run(r.client, keys, argv...).Result()
+	res, err := archiveAllCmd.Run(context.Background(), r.client, keys, argv...).Result()
 	if err != nil {
 		return 0, err
 	}
@@ -1006,19 +1179,19 @@ return redis.call("DEL", KEYS[1])
 // If a queue with the given name doesn't exist, it returns QueueNotFoundError.
 // If a task with the given id doesn't exist in the queue, it returns TaskNotFoundError
 // If a task is in active state it returns non-nil error with Code FailedPrecondition.
-func (r *RDB) DeleteTask(qname string, id uuid.UUID) error {
+func (r *RDB) DeleteTask(qname, id string) error {
 	var op errors.Op = "rdb.DeleteTask"
 	if err := r.checkQueueExists(qname); err != nil {
 		return errors.E(op, errors.CanonicalCode(err), err)
 	}
 	keys := []string{
-		base.TaskKey(qname, id.String()),
+		base.TaskKey(qname, id),
 	}
 	argv := []interface{}{
-		id.String(),
+		id,
 		base.QueueKeyPrefix(qname),
 	}
-	res, err := deleteTaskCmd.Run(r.client, keys, argv...).Result()
+	res, err := deleteTaskCmd.Run(context.Background(), r.client, keys, argv...).Result()
 	if err != nil {
 		return errors.E(op, errors.Unknown, err)
 	}
@@ -1030,7 +1203,7 @@ func (r *RDB) DeleteTask(qname string, id uuid.UUID) error {
 	case 1:
 		return nil
 	case 0:
-		return errors.E(op, errors.NotFound, &errors.TaskNotFoundError{Queue: qname, ID: id.String()})
+		return errors.E(op, errors.NotFound, &errors.TaskNotFoundError{Queue: qname, ID: id})
 	case -1:
 		return errors.E(op, errors.FailedPrecondition, "cannot delete task in active state. use CancelTask instead.")
 	default:
@@ -1080,6 +1253,20 @@ func (r *RDB) DeleteAllScheduledTasks(qname string) (int64, error) {
 	return n, nil
 }
 
+// DeleteAllCompletedTasks deletes all completed tasks from the given queue
+// and returns the number of tasks deleted.
+func (r *RDB) DeleteAllCompletedTasks(qname string) (int64, error) {
+	var op errors.Op = "rdb.DeleteAllCompletedTasks"
+	n, err := r.deleteAll(base.CompletedKey(qname), qname)
+	if errors.IsQueueNotFound(err) {
+		return 0, errors.E(op, errors.NotFound, err)
+	}
+	if err != nil {
+		return 0, errors.E(op, errors.Unknown, err)
+	}
+	return n, nil
+}
+
 // deleteAllCmd deletes tasks from the given zset.
 //
 // Input:
@@ -1110,7 +1297,7 @@ func (r *RDB) deleteAll(key, qname string) (int64, error) {
 		base.TaskKeyPrefix(qname),
 		qname,
 	}
-	res, err := deleteAllCmd.Run(r.client, []string{key}, argv...).Result()
+	res, err := deleteAllCmd.Run(context.Background(), r.client, []string{key}, argv...).Result()
 	if err != nil {
 		return 0, err
 	}
@@ -1151,7 +1338,7 @@ func (r *RDB) DeleteAllPendingTasks(qname string) (int64, error) {
 	argv := []interface{}{
 		base.TaskKeyPrefix(qname),
 	}
-	res, err := deleteAllPendingCmd.Run(r.client, keys, argv...).Result()
+	res, err := deleteAllPendingCmd.Run(context.Background(), r.client, keys, argv...).Result()
 	if err != nil {
 		return 0, errors.E(op, errors.Unknown, err)
 	}
@@ -1282,7 +1469,7 @@ return 1`)
 // the queue is empty.
 func (r *RDB) RemoveQueue(qname string, force bool) error {
 	var op errors.Op = "rdb.RemoveQueue"
-	exists, err := r.client.SIsMember(base.AllQueues, qname).Result()
+	exists, err := r.queueExists(qname)
 	if err != nil {
 		return err
 	}
@@ -1303,7 +1490,7 @@ func (r *RDB) RemoveQueue(qname string, force bool) error {
 		base.ArchivedKey(qname),
 		base.DeadlinesKey(qname),
 	}
-	res, err := script.Run(r.client, keys, base.TaskKeyPrefix(qname)).Result()
+	res, err := script.Run(context.Background(), r.client, keys, base.TaskKeyPrefix(qname)).Result()
 	if err != nil {
 		return errors.E(op, errors.Unknown, err)
 	}
@@ -1313,7 +1500,7 @@ func (r *RDB) RemoveQueue(qname string, force bool) error {
 	}
 	switch n {
 	case 1:
-		if err := r.client.SRem(base.AllQueues, qname).Err(); err != nil {
+		if err := r.client.SRem(context.Background(), base.AllQueues, qname).Err(); err != nil {
 			return errors.E(op, errors.Unknown, err)
 		}
 		return nil
@@ -1336,7 +1523,7 @@ return keys`)
 // ListServers returns the list of server info.
 func (r *RDB) ListServers() ([]*base.ServerInfo, error) {
 	now := time.Now()
-	res, err := listServerKeysCmd.Run(r.client, []string{base.AllServers}, now.Unix()).Result()
+	res, err := listServerKeysCmd.Run(context.Background(), r.client, []string{base.AllServers}, now.Unix()).Result()
 	if err != nil {
 		return nil, err
 	}
@@ -1346,7 +1533,7 @@ func (r *RDB) ListServers() ([]*base.ServerInfo, error) {
 	}
 	var servers []*base.ServerInfo
 	for _, key := range keys {
-		data, err := r.client.Get(key).Result()
+		data, err := r.client.Get(context.Background(), key).Result()
 		if err != nil {
 			continue // skip bad data
 		}
@@ -1370,7 +1557,7 @@ return keys`)
 func (r *RDB) ListWorkers() ([]*base.WorkerInfo, error) {
 	var op errors.Op = "rdb.ListWorkers"
 	now := time.Now()
-	res, err := listWorkersCmd.Run(r.client, []string{base.AllWorkers}, now.Unix()).Result()
+	res, err := listWorkersCmd.Run(context.Background(), r.client, []string{base.AllWorkers}, now.Unix()).Result()
 	if err != nil {
 		return nil, errors.E(op, errors.Unknown, err)
 	}
@@ -1380,7 +1567,7 @@ func (r *RDB) ListWorkers() ([]*base.WorkerInfo, error) {
 	}
 	var workers []*base.WorkerInfo
 	for _, key := range keys {
-		data, err := r.client.HVals(key).Result()
+		data, err := r.client.HVals(context.Background(), key).Result()
 		if err != nil {
 			continue // skip bad data
 		}
@@ -1405,7 +1592,7 @@ return keys`)
 // ListSchedulerEntries returns the list of scheduler entries.
 func (r *RDB) ListSchedulerEntries() ([]*base.SchedulerEntry, error) {
 	now := time.Now()
-	res, err := listSchedulerKeysCmd.Run(r.client, []string{base.AllSchedulers}, now.Unix()).Result()
+	res, err := listSchedulerKeysCmd.Run(context.Background(), r.client, []string{base.AllSchedulers}, now.Unix()).Result()
 	if err != nil {
 		return nil, err
 	}
@@ -1415,7 +1602,7 @@ func (r *RDB) ListSchedulerEntries() ([]*base.SchedulerEntry, error) {
 	}
 	var entries []*base.SchedulerEntry
 	for _, key := range keys {
-		data, err := r.client.LRange(key, 0, -1).Result()
+		data, err := r.client.LRange(context.Background(), key, 0, -1).Result()
 		if err != nil {
 			continue // skip bad data
 		}
@@ -1433,7 +1620,7 @@ func (r *RDB) ListSchedulerEntries() ([]*base.SchedulerEntry, error) {
 // ListSchedulerEnqueueEvents returns the list of scheduler enqueue events.
 func (r *RDB) ListSchedulerEnqueueEvents(entryID string, pgn Pagination) ([]*base.SchedulerEnqueueEvent, error) {
 	key := base.SchedulerHistoryKey(entryID)
-	zs, err := r.client.ZRevRangeWithScores(key, pgn.start(), pgn.stop()).Result()
+	zs, err := r.client.ZRevRangeWithScores(context.Background(), key, pgn.start(), pgn.stop()).Result()
 	if err != nil {
 		return nil, err
 	}
@@ -1455,7 +1642,7 @@ func (r *RDB) ListSchedulerEnqueueEvents(entryID string, pgn Pagination) ([]*bas
 // Pause pauses processing of tasks from the given queue.
 func (r *RDB) Pause(qname string) error {
 	key := base.PausedKey(qname)
-	ok, err := r.client.SetNX(key, time.Now().Unix(), 0).Result()
+	ok, err := r.client.SetNX(context.Background(), key, time.Now().Unix(), 0).Result()
 	if err != nil {
 		return err
 	}
@@ -1468,7 +1655,7 @@ func (r *RDB) Pause(qname string) error {
 // Unpause resumes processing of tasks from the given queue.
 func (r *RDB) Unpause(qname string) error {
 	key := base.PausedKey(qname)
-	deleted, err := r.client.Del(key).Result()
+	deleted, err := r.client.Del(context.Background(), key).Result()
 	if err != nil {
 		return err
 	}
@@ -1481,7 +1668,7 @@ func (r *RDB) Unpause(qname string) error {
 // ClusterKeySlot returns an integer identifying the hash slot the given queue hashes to.
 func (r *RDB) ClusterKeySlot(qname string) (int64, error) {
 	key := base.PendingKey(qname)
-	return r.client.ClusterKeySlot(key).Result()
+	return r.client.ClusterKeySlot(context.Background(), key).Result()
 }
 
 // ClusterNodes returns a list of nodes the given queue belongs to.
@@ -1490,7 +1677,7 @@ func (r *RDB) ClusterNodes(qname string) ([]redis.ClusterNode, error) {
 	if err != nil {
 		return nil, err
 	}
-	clusterSlots, err := r.client.ClusterSlots().Result()
+	clusterSlots, err := r.client.ClusterSlots(context.Background()).Result()
 	if err != nil {
 		return nil, err
 	}

internal/rdb/rdb.go

@@ -6,10 +6,11 @@
 package rdb
 
 import (
+	"context"
 	"fmt"
 	"time"
 
-	"github.com/go-redis/redis/v7"
+	"github.com/go-redis/redis/v8"
 	"github.com/hibiken/asynq/internal/base"
 	"github.com/hibiken/asynq/internal/errors"
 	"github.com/spf13/cast"
@@ -39,16 +40,29 @@ func (r *RDB) Client() redis.UniversalClient {
 
 // Ping checks the connection with redis server.
 func (r *RDB) Ping() error {
-	return r.client.Ping().Err()
+	return r.client.Ping(context.Background()).Err()
 }
 
 func (r *RDB) runScript(op errors.Op, script *redis.Script, keys []string, args ...interface{}) error {
-	if err := script.Run(r.client, keys, args...).Err(); err != nil {
+	if err := script.Run(context.Background(), r.client, keys, args...).Err(); err != nil {
 		return errors.E(op, errors.Internal, fmt.Sprintf("redis eval error: %v", err))
 	}
 	return nil
 }
 
+// Runs the given script with keys and args and retuns the script's return value as int64.
+func (r *RDB) runScriptWithErrorCode(op errors.Op, script *redis.Script, keys []string, args ...interface{}) (int64, error) {
+	res, err := script.Run(context.Background(), r.client, keys, args...).Result()
+	if err != nil {
+		return 0, errors.E(op, errors.Unknown, fmt.Sprintf("redis eval error: %v", err))
+	}
+	n, ok := res.(int64)
+	if !ok {
+		return 0, errors.E(op, errors.Internal, fmt.Sprintf("unexpected return value from Lua script: %v", res))
+	}
+	return n, nil
+}
+
 // enqueueCmd enqueues a given task message.
 //
 // Input:
@@ -62,7 +76,11 @@ func (r *RDB) runScript(op errors.Op, script *redis.Script, keys []string, args
 //
 // Output:
 // Returns 1 if successfully enqueued
+// Returns 0 if task ID already exists
 var enqueueCmd = redis.NewScript(`
+if redis.call("EXISTS", KEYS[1]) == 1 then
+	return 0
+end
 redis.call("HSET", KEYS[1],
            "msg", ARGV[1],
            "state", "pending",
@@ -79,20 +97,27 @@ func (r *RDB) Enqueue(msg *base.TaskMessage) error {
 	if err != nil {
 		return errors.E(op, errors.Unknown, fmt.Sprintf("cannot encode message: %v", err))
 	}
-	if err := r.client.SAdd(base.AllQueues, msg.Queue).Err(); err != nil {
+	if err := r.client.SAdd(context.Background(), base.AllQueues, msg.Queue).Err(); err != nil {
 		return errors.E(op, errors.Unknown, &errors.RedisCommandError{Command: "sadd", Err: err})
 	}
 	keys := []string{
-		base.TaskKey(msg.Queue, msg.ID.String()),
+		base.TaskKey(msg.Queue, msg.ID),
 		base.PendingKey(msg.Queue),
 	}
 	argv := []interface{}{
 		encoded,
-		msg.ID.String(),
+		msg.ID,
 		msg.Timeout,
 		msg.Deadline,
 	}
-	return r.runScript(op, enqueueCmd, keys, argv...)
+	n, err := r.runScriptWithErrorCode(op, enqueueCmd, keys, argv...)
+	if err != nil {
+		return err
+	}
+	if n == 0 {
+		return errors.E(op, errors.AlreadyExists, errors.ErrTaskIdConflict)
+	}
+	return nil
 }
 
 // enqueueUniqueCmd enqueues the task message if the task is unique.
@@ -109,10 +134,14 @@ func (r *RDB) Enqueue(msg *base.TaskMessage) error {
 //
 // Output:
 // Returns 1 if successfully enqueued
-// Returns 0 if task already exists
+// Returns 0 if task ID conflicts with another task
+// Returns -1 if task unique key already exists
 var enqueueUniqueCmd = redis.NewScript(`
 local ok = redis.call("SET", KEYS[1], ARGV[1], "NX", "EX", ARGV[2])
 if not ok then
+  return -1 
+end
+if redis.call("EXISTS", KEYS[2]) == 1 then
   return 0
 end
 redis.call("HSET", KEYS[2],
@@ -133,31 +162,30 @@ func (r *RDB) EnqueueUnique(msg *base.TaskMessage, ttl time.Duration) error {
 	if err != nil {
 		return errors.E(op, errors.Internal, "cannot encode task message: %v", err)
 	}
-	if err := r.client.SAdd(base.AllQueues, msg.Queue).Err(); err != nil {
+	if err := r.client.SAdd(context.Background(), base.AllQueues, msg.Queue).Err(); err != nil {
 		return errors.E(op, errors.Unknown, &errors.RedisCommandError{Command: "sadd", Err: err})
 	}
 	keys := []string{
 		msg.UniqueKey,
-		base.TaskKey(msg.Queue, msg.ID.String()),
+		base.TaskKey(msg.Queue, msg.ID),
 		base.PendingKey(msg.Queue),
 	}
 	argv := []interface{}{
-		msg.ID.String(),
+		msg.ID,
 		int(ttl.Seconds()),
 		encoded,
 		msg.Timeout,
 		msg.Deadline,
 	}
-	res, err := enqueueUniqueCmd.Run(r.client, keys, argv...).Result()
+	n, err := r.runScriptWithErrorCode(op, enqueueUniqueCmd, keys, argv...)
 	if err != nil {
-		return errors.E(op, errors.Unknown, fmt.Sprintf("redis eval error: %v", err))
+		return err
 	}
-	n, ok := res.(int64)
+	if n == -1 {
-	if !ok {
+		return errors.E(op, errors.AlreadyExists, errors.ErrDuplicateTask)
-		return errors.E(op, errors.Internal, fmt.Sprintf("unexpected return value from Lua script: %v", res))
 	}
 	if n == 0 {
-		return errors.E(op, errors.AlreadyExists, errors.ErrDuplicateTask)
+		return errors.E(op, errors.AlreadyExists, errors.ErrTaskIdConflict)
 	}
 	return nil
 }
@@ -223,7 +251,7 @@ func (r *RDB) Dequeue(qnames ...string) (msg *base.TaskMessage, deadline time.Ti
 			time.Now().Unix(),
 			base.TaskKeyPrefix(qname),
 		}
-		res, err := dequeueCmd.Run(r.client, keys, argv...).Result()
+		res, err := dequeueCmd.Run(context.Background(), r.client, keys, argv...).Result()
 		if err == redis.Nil {
 			continue
 		} else if err != nil {
@@ -302,7 +330,7 @@ end
 return redis.status_reply("OK")
 `)
 
-// Done removes the task from active queue to mark the task as done.
+// Done removes the task from active queue and deletes the task.
 // It removes a uniqueness lock acquired by the task, if any.
 func (r *RDB) Done(msg *base.TaskMessage) error {
 	var op errors.Op = "rdb.Done"
@@ -311,13 +339,14 @@ func (r *RDB) Done(msg *base.TaskMessage) error {
 	keys := []string{
 		base.ActiveKey(msg.Queue),
 		base.DeadlinesKey(msg.Queue),
-		base.TaskKey(msg.Queue, msg.ID.String()),
+		base.TaskKey(msg.Queue, msg.ID),
 		base.ProcessedKey(msg.Queue, now),
 	}
 	argv := []interface{}{
-		msg.ID.String(),
+		msg.ID,
 		expireAt.Unix(),
 	}
+	// Note: We cannot pass empty unique key when running this script in redis-cluster.
 	if len(msg.UniqueKey) > 0 {
 		keys = append(keys, msg.UniqueKey)
 		return r.runScript(op, doneUniqueCmd, keys, argv...)
@@ -325,6 +354,96 @@ func (r *RDB) Done(msg *base.TaskMessage) error {
 	return r.runScript(op, doneCmd, keys, argv...)
 }
 
+// KEYS[1] -> asynq:{<qname>}:active
+// KEYS[2] -> asynq:{<qname>}:deadlines
+// KEYS[3] -> asynq:{<qname>}:completed
+// KEYS[4] -> asynq:{<qname>}:t:<task_id>
+// KEYS[5] -> asynq:{<qname>}:processed:<yyyy-mm-dd>
+// ARGV[1] -> task ID
+// ARGV[2] -> stats expiration timestamp
+// ARGV[3] -> task exipration time in unix time
+// ARGV[4] -> task message data
+var markAsCompleteCmd = redis.NewScript(`
+if redis.call("LREM", KEYS[1], 0, ARGV[1]) == 0 then
+  return redis.error_reply("NOT FOUND")
+end
+if redis.call("ZREM", KEYS[2], ARGV[1]) == 0 then
+  return redis.error_reply("NOT FOUND")
+end
+if redis.call("ZADD", KEYS[3], ARGV[3], ARGV[1]) ~= 1 then
+  redis.redis.error_reply("INTERNAL")
+end
+redis.call("HSET", KEYS[4], "msg", ARGV[4], "state", "completed")
+local n = redis.call("INCR", KEYS[5])
+if tonumber(n) == 1 then
+	redis.call("EXPIREAT", KEYS[5], ARGV[2])
+end
+return redis.status_reply("OK")
+`)
+
+// KEYS[1] -> asynq:{<qname>}:active
+// KEYS[2] -> asynq:{<qname>}:deadlines
+// KEYS[3] -> asynq:{<qname>}:completed
+// KEYS[4] -> asynq:{<qname>}:t:<task_id>
+// KEYS[5] -> asynq:{<qname>}:processed:<yyyy-mm-dd>
+// KEYS[6] -> asynq:{<qname>}:unique:{<checksum>}
+// ARGV[1] -> task ID
+// ARGV[2] -> stats expiration timestamp
+// ARGV[3] -> task exipration time in unix time
+// ARGV[4] -> task message data
+var markAsCompleteUniqueCmd = redis.NewScript(`
+if redis.call("LREM", KEYS[1], 0, ARGV[1]) == 0 then
+  return redis.error_reply("NOT FOUND")
+end
+if redis.call("ZREM", KEYS[2], ARGV[1]) == 0 then
+  return redis.error_reply("NOT FOUND")
+end
+if redis.call("ZADD", KEYS[3], ARGV[3], ARGV[1]) ~= 1 then
+  redis.redis.error_reply("INTERNAL")
+end
+redis.call("HSET", KEYS[4], "msg", ARGV[4], "state", "completed")
+local n = redis.call("INCR", KEYS[5])
+if tonumber(n) == 1 then
+	redis.call("EXPIREAT", KEYS[5], ARGV[2])
+end
+if redis.call("GET", KEYS[6]) == ARGV[1] then
+  redis.call("DEL", KEYS[6])
+end
+return redis.status_reply("OK")
+`)
+
+// MarkAsComplete removes the task from active queue to mark the task as completed.
+// It removes a uniqueness lock acquired by the task, if any.
+func (r *RDB) MarkAsComplete(msg *base.TaskMessage) error {
+	var op errors.Op = "rdb.MarkAsComplete"
+	now := time.Now()
+	statsExpireAt := now.Add(statsTTL)
+	msg.CompletedAt = now.Unix()
+	encoded, err := base.EncodeMessage(msg)
+	if err != nil {
+		return errors.E(op, errors.Unknown, fmt.Sprintf("cannot encode message: %v", err))
+	}
+	keys := []string{
+		base.ActiveKey(msg.Queue),
+		base.DeadlinesKey(msg.Queue),
+		base.CompletedKey(msg.Queue),
+		base.TaskKey(msg.Queue, msg.ID),
+		base.ProcessedKey(msg.Queue, now),
+	}
+	argv := []interface{}{
+		msg.ID,
+		statsExpireAt.Unix(),
+		now.Unix() + msg.Retention,
+		encoded,
+	}
+	// Note: We cannot pass empty unique key when running this script in redis-cluster.
+	if len(msg.UniqueKey) > 0 {
+		keys = append(keys, msg.UniqueKey)
+		return r.runScript(op, markAsCompleteUniqueCmd, keys, argv...)
+	}
+	return r.runScript(op, markAsCompleteCmd, keys, argv...)
+}
+
 // KEYS[1] -> asynq:{<qname>}:active
 // KEYS[2] -> asynq:{<qname>}:deadlines
 // KEYS[3] -> asynq:{<qname>}:pending
@@ -349,9 +468,9 @@ func (r *RDB) Requeue(msg *base.TaskMessage) error {
 		base.ActiveKey(msg.Queue),
 		base.DeadlinesKey(msg.Queue),
 		base.PendingKey(msg.Queue),
-		base.TaskKey(msg.Queue, msg.ID.String()),
+		base.TaskKey(msg.Queue, msg.ID),
 	}
-	return r.runScript(op, requeueCmd, keys, msg.ID.String())
+	return r.runScript(op, requeueCmd, keys, msg.ID)
 }
 
 // KEYS[1] -> asynq:{<qname>}:t:<task_id>
@@ -361,7 +480,14 @@ func (r *RDB) Requeue(msg *base.TaskMessage) error {
 // 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)
+//
+// Output:
+// Returns 1 if successfully enqueued
+// Returns 0 if task ID already exists
 var scheduleCmd = redis.NewScript(`
+if redis.call("EXISTS", KEYS[1]) == 1 then
+	return 0
+end
 redis.call("HSET", KEYS[1],
            "msg", ARGV[1],
            "state", "scheduled",
@@ -378,21 +504,28 @@ func (r *RDB) Schedule(msg *base.TaskMessage, processAt time.Time) error {
 	if err != nil {
 		return errors.E(op, errors.Unknown, fmt.Sprintf("cannot encode message: %v", err))
 	}
-	if err := r.client.SAdd(base.AllQueues, msg.Queue).Err(); err != nil {
+	if err := r.client.SAdd(context.Background(), base.AllQueues, msg.Queue).Err(); err != nil {
 		return errors.E(op, errors.Unknown, &errors.RedisCommandError{Command: "sadd", Err: err})
 	}
 	keys := []string{
-		base.TaskKey(msg.Queue, msg.ID.String()),
+		base.TaskKey(msg.Queue, msg.ID),
 		base.ScheduledKey(msg.Queue),
 	}
 	argv := []interface{}{
 		encoded,
 		processAt.Unix(),
-		msg.ID.String(),
+		msg.ID,
 		msg.Timeout,
 		msg.Deadline,
 	}
-	return r.runScript(op, scheduleCmd, keys, argv...)
+	n, err := r.runScriptWithErrorCode(op, scheduleCmd, keys, argv...)
+	if err != nil {
+		return err
+	}
+	if n == 0 {
+		return errors.E(op, errors.AlreadyExists, errors.ErrTaskIdConflict)
+	}
+	return nil
 }
 
 // KEYS[1] -> unique key
@@ -404,9 +537,17 @@ func (r *RDB) Schedule(msg *base.TaskMessage, processAt time.Time) error {
 // 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)
+//
+// Output:
+// Returns 1 if successfully scheduled
+// Returns 0 if task ID already exists
+// Returns -1 if task unique key already exists
 var scheduleUniqueCmd = redis.NewScript(`
 local ok = redis.call("SET", KEYS[1], ARGV[1], "NX", "EX", ARGV[2])
 if not ok then
+  return -1
+end
+if redis.call("EXISTS", KEYS[2]) == 1 then
   return 0
 end
 redis.call("HSET", KEYS[2],
@@ -427,32 +568,31 @@ func (r *RDB) ScheduleUnique(msg *base.TaskMessage, processAt time.Time, ttl tim
 	if err != nil {
 		return errors.E(op, errors.Internal, fmt.Sprintf("cannot encode task message: %v", err))
 	}
-	if err := r.client.SAdd(base.AllQueues, msg.Queue).Err(); err != nil {
+	if err := r.client.SAdd(context.Background(), base.AllQueues, msg.Queue).Err(); err != nil {
 		return errors.E(op, errors.Unknown, &errors.RedisCommandError{Command: "sadd", Err: err})
 	}
 	keys := []string{
 		msg.UniqueKey,
-		base.TaskKey(msg.Queue, msg.ID.String()),
+		base.TaskKey(msg.Queue, msg.ID),
 		base.ScheduledKey(msg.Queue),
 	}
 	argv := []interface{}{
-		msg.ID.String(),
+		msg.ID,
 		int(ttl.Seconds()),
 		processAt.Unix(),
 		encoded,
 		msg.Timeout,
 		msg.Deadline,
 	}
-	res, err := scheduleUniqueCmd.Run(r.client, keys, argv...).Result()
+	n, err := r.runScriptWithErrorCode(op, scheduleUniqueCmd, keys, argv...)
 	if err != nil {
-		return errors.E(op, errors.Unknown, fmt.Sprintf("redis eval error: %v", err))
+		return err
 	}
-	n, ok := res.(int64)
+	if n == -1 {
-	if !ok {
+		return errors.E(op, errors.AlreadyExists, errors.ErrDuplicateTask)
-		return errors.E(op, errors.Internal, fmt.Sprintf("cast error: unexpected return value from Lua script: %v", res))
 	}
 	if n == 0 {
-		return errors.E(op, errors.AlreadyExists, errors.ErrDuplicateTask)
+		return errors.E(op, errors.AlreadyExists, errors.ErrTaskIdConflict)
 	}
 	return nil
 }
@@ -467,6 +607,7 @@ func (r *RDB) ScheduleUnique(msg *base.TaskMessage, processAt time.Time, ttl tim
 // ARGV[2] -> updated base.TaskMessage value
 // ARGV[3] -> retry_at UNIX timestamp
 // ARGV[4] -> stats expiration timestamp
+// ARGV[5] -> is_failure (bool)
 var retryCmd = redis.NewScript(`
 if redis.call("LREM", KEYS[2], 0, ARGV[1]) == 0 then
   return redis.error_reply("NOT FOUND")
@@ -476,23 +617,28 @@ if redis.call("ZREM", KEYS[3], ARGV[1]) == 0 then
 end
 redis.call("ZADD", KEYS[4], ARGV[3], ARGV[1])
 redis.call("HSET", KEYS[1], "msg", ARGV[2], "state", "retry")
-local n = redis.call("INCR", KEYS[5])
+if tonumber(ARGV[5]) == 1 then
-if tonumber(n) == 1 then
+	local n = redis.call("INCR", KEYS[5])
+	if tonumber(n) == 1 then
 		redis.call("EXPIREAT", KEYS[5], ARGV[4])
-end
+	end
-local m = redis.call("INCR", KEYS[6])
+	local m = redis.call("INCR", KEYS[6])
-if tonumber(m) == 1 then
+	if tonumber(m) == 1 then
 		redis.call("EXPIREAT", KEYS[6], ARGV[4])
+	end
 end
 return redis.status_reply("OK")`)
 
-// Retry moves the task from active to retry queue, incrementing retry count
+// Retry moves the task from active to retry queue.
-// and assigning error message to the task message.
+// It also annotates the message with the given error message and
-func (r *RDB) Retry(msg *base.TaskMessage, processAt time.Time, errMsg string) error {
+// if isFailure is true increments the retried counter.
+func (r *RDB) Retry(msg *base.TaskMessage, processAt time.Time, errMsg string, isFailure bool) error {
 	var op errors.Op = "rdb.Retry"
 	now := time.Now()
 	modified := *msg
+	if isFailure {
 		modified.Retried++
+	}
 	modified.ErrorMsg = errMsg
 	modified.LastFailedAt = now.Unix()
 	encoded, err := base.EncodeMessage(&modified)
@@ -501,7 +647,7 @@ func (r *RDB) Retry(msg *base.TaskMessage, processAt time.Time, errMsg string) e
 	}
 	expireAt := now.Add(statsTTL)
 	keys := []string{
-		base.TaskKey(msg.Queue, msg.ID.String()),
+		base.TaskKey(msg.Queue, msg.ID),
 		base.ActiveKey(msg.Queue),
 		base.DeadlinesKey(msg.Queue),
 		base.RetryKey(msg.Queue),
@@ -509,10 +655,11 @@ func (r *RDB) Retry(msg *base.TaskMessage, processAt time.Time, errMsg string) e
 		base.FailedKey(msg.Queue, now),
 	}
 	argv := []interface{}{
-		msg.ID.String(),
+		msg.ID,
 		encoded,
 		processAt.Unix(),
 		expireAt.Unix(),
+		isFailure,
 	}
 	return r.runScript(op, retryCmd, keys, argv...)
 }
@@ -570,7 +717,7 @@ func (r *RDB) Archive(msg *base.TaskMessage, errMsg string) error {
 	cutoff := now.AddDate(0, 0, -archivedExpirationInDays)
 	expireAt := now.Add(statsTTL)
 	keys := []string{
-		base.TaskKey(msg.Queue, msg.ID.String()),
+		base.TaskKey(msg.Queue, msg.ID),
 		base.ActiveKey(msg.Queue),
 		base.DeadlinesKey(msg.Queue),
 		base.ArchivedKey(msg.Queue),
@@ -578,7 +725,7 @@ func (r *RDB) Archive(msg *base.TaskMessage, errMsg string) error {
 		base.FailedKey(msg.Queue, now),
 	}
 	argv := []interface{}{
-		msg.ID.String(),
+		msg.ID,
 		encoded,
 		now.Unix(),
 		cutoff.Unix(),
@@ -618,7 +765,7 @@ return table.getn(ids)`)
 // from the src zset to the dst list. It returns the number of tasks moved.
 func (r *RDB) forward(src, dst, taskKeyPrefix string) (int, error) {
 	now := float64(time.Now().Unix())
-	res, err := forwardCmd.Run(r.client, []string{src, dst}, now, taskKeyPrefix).Result()
+	res, err := forwardCmd.Run(context.Background(), r.client, []string{src, dst}, now, taskKeyPrefix).Result()
 	if err != nil {
 		return 0, errors.E(errors.Internal, fmt.Sprintf("redis eval error: %v", err))
 	}
@@ -647,6 +794,57 @@ func (r *RDB) forwardAll(qname string) (err error) {
 	return nil
 }
 
+// KEYS[1] -> asynq:{<qname>}:completed
+// ARGV[1] -> current time in unix time
+// ARGV[2] -> task key prefix
+// ARGV[3] -> batch size (i.e. maximum number of tasks to delete)
+//
+// Returns the number of tasks deleted.
+var deleteExpiredCompletedTasksCmd = redis.NewScript(`
+local ids = redis.call("ZRANGEBYSCORE", KEYS[1], "-inf", ARGV[1], "LIMIT", 0, tonumber(ARGV[3]))
+for _, id in ipairs(ids) do
+	redis.call("DEL", ARGV[2] .. id)
+	redis.call("ZREM", KEYS[1], id)
+end
+return table.getn(ids)`)
+
+// DeleteExpiredCompletedTasks checks for any expired tasks in the given queue's completed set,
+// and delete all expired tasks.
+func (r *RDB) DeleteExpiredCompletedTasks(qname string) error {
+	// Note: Do this operation in fix batches to prevent long running script.
+	const batchSize = 100
+	for {
+		n, err := r.deleteExpiredCompletedTasks(qname, batchSize)
+		if err != nil {
+			return err
+		}
+		if n == 0 {
+			return nil
+		}
+	}
+}
+
+// deleteExpiredCompletedTasks runs the lua script to delete expired deleted task with the specified
+// batch size. It reports the number of tasks deleted.
+func (r *RDB) deleteExpiredCompletedTasks(qname string, batchSize int) (int64, error) {
+	var op errors.Op = "rdb.DeleteExpiredCompletedTasks"
+	keys := []string{base.CompletedKey(qname)}
+	argv := []interface{}{
+		time.Now().Unix(),
+		base.TaskKeyPrefix(qname),
+		batchSize,
+	}
+	res, err := deleteExpiredCompletedTasksCmd.Run(context.Background(), r.client, keys, argv...).Result()
+	if err != nil {
+		return 0, errors.E(op, errors.Internal, fmt.Sprintf("redis eval error: %v", err))
+	}
+	n, ok := res.(int64)
+	if !ok {
+		return 0, errors.E(op, errors.Internal, fmt.Sprintf("unexpected return value from Lua script: %v", res))
+	}
+	return n, nil
+}
+
 // KEYS[1] -> asynq:{<qname>}:deadlines
 // ARGV[1] -> deadline in unix time
 // ARGV[2] -> task key prefix
@@ -665,7 +863,7 @@ func (r *RDB) ListDeadlineExceeded(deadline time.Time, qnames ...string) ([]*bas
 	var op errors.Op = "rdb.ListDeadlineExceeded"
 	var msgs []*base.TaskMessage
 	for _, qname := range qnames {
-		res, err := listDeadlineExceededCmd.Run(r.client,
+		res, err := listDeadlineExceededCmd.Run(context.Background(), r.client,
 			[]string{base.DeadlinesKey(qname)},
 			deadline.Unix(), base.TaskKeyPrefix(qname)).Result()
 		if err != nil {
@@ -720,10 +918,10 @@ func (r *RDB) WriteServerState(info *base.ServerInfo, workers []*base.WorkerInfo
 	}
 	skey := base.ServerInfoKey(info.Host, info.PID, info.ServerID)
 	wkey := base.WorkersKey(info.Host, info.PID, info.ServerID)
-	if err := r.client.ZAdd(base.AllServers, &redis.Z{Score: float64(exp.Unix()), Member: skey}).Err(); err != nil {
+	if err := r.client.ZAdd(context.Background(), base.AllServers, &redis.Z{Score: float64(exp.Unix()), Member: skey}).Err(); err != nil {
 		return errors.E(op, errors.Unknown, &errors.RedisCommandError{Command: "sadd", Err: err})
 	}
-	if err := r.client.ZAdd(base.AllWorkers, &redis.Z{Score: float64(exp.Unix()), Member: wkey}).Err(); err != nil {
+	if err := r.client.ZAdd(context.Background(), base.AllWorkers, &redis.Z{Score: float64(exp.Unix()), Member: wkey}).Err(); err != nil {
 		return errors.E(op, errors.Unknown, &errors.RedisCommandError{Command: "zadd", Err: err})
 	}
 	return r.runScript(op, writeServerStateCmd, []string{skey, wkey}, args...)
@@ -741,10 +939,10 @@ func (r *RDB) ClearServerState(host string, pid int, serverID string) error {
 	var op errors.Op = "rdb.ClearServerState"
 	skey := base.ServerInfoKey(host, pid, serverID)
 	wkey := base.WorkersKey(host, pid, serverID)
-	if err := r.client.ZRem(base.AllServers, skey).Err(); err != nil {
+	if err := r.client.ZRem(context.Background(), base.AllServers, skey).Err(); err != nil {
 		return errors.E(op, errors.Internal, &errors.RedisCommandError{Command: "zrem", Err: err})
 	}
-	if err := r.client.ZRem(base.AllWorkers, wkey).Err(); err != nil {
+	if err := r.client.ZRem(context.Background(), base.AllWorkers, wkey).Err(); err != nil {
 		return errors.E(op, errors.Internal, &errors.RedisCommandError{Command: "zrem", Err: err})
 	}
 	return r.runScript(op, clearServerStateCmd, []string{skey, wkey})
@@ -774,7 +972,7 @@ func (r *RDB) WriteSchedulerEntries(schedulerID string, entries []*base.Schedule
 	}
 	exp := time.Now().Add(ttl).UTC()
 	key := base.SchedulerEntriesKey(schedulerID)
-	err := r.client.ZAdd(base.AllSchedulers, &redis.Z{Score: float64(exp.Unix()), Member: key}).Err()
+	err := r.client.ZAdd(context.Background(), base.AllSchedulers, &redis.Z{Score: float64(exp.Unix()), Member: key}).Err()
 	if err != nil {
 		return errors.E(op, errors.Unknown, &errors.RedisCommandError{Command: "zadd", Err: err})
 	}
@@ -785,10 +983,10 @@ func (r *RDB) WriteSchedulerEntries(schedulerID string, entries []*base.Schedule
 func (r *RDB) ClearSchedulerEntries(scheduelrID string) error {
 	var op errors.Op = "rdb.ClearSchedulerEntries"
 	key := base.SchedulerEntriesKey(scheduelrID)
-	if err := r.client.ZRem(base.AllSchedulers, key).Err(); err != nil {
+	if err := r.client.ZRem(context.Background(), base.AllSchedulers, key).Err(); err != nil {
 		return errors.E(op, errors.Unknown, &errors.RedisCommandError{Command: "zrem", Err: err})
 	}
-	if err := r.client.Del(key).Err(); err != nil {
+	if err := r.client.Del(context.Background(), key).Err(); err != nil {
 		return errors.E(op, errors.Unknown, &errors.RedisCommandError{Command: "del", Err: err})
 	}
 	return nil
@@ -797,8 +995,8 @@ func (r *RDB) ClearSchedulerEntries(scheduelrID string) error {
 // CancelationPubSub returns a pubsub for cancelation messages.
 func (r *RDB) CancelationPubSub() (*redis.PubSub, error) {
 	var op errors.Op = "rdb.CancelationPubSub"
-	pubsub := r.client.Subscribe(base.CancelChannel)
+	pubsub := r.client.Subscribe(context.Background(), base.CancelChannel)
-	_, err := pubsub.Receive()
+	_, err := pubsub.Receive(context.Background())
 	if err != nil {
 		return nil, errors.E(op, errors.Unknown, fmt.Sprintf("redis pubsub receive error: %v", err))
 	}
@@ -809,7 +1007,7 @@ func (r *RDB) CancelationPubSub() (*redis.PubSub, error) {
 // The message is the ID for the task to be canceled.
 func (r *RDB) PublishCancelation(id string) error {
 	var op errors.Op = "rdb.PublishCancelation"
-	if err := r.client.Publish(base.CancelChannel, id).Err(); err != nil {
+	if err := r.client.Publish(context.Background(), base.CancelChannel, id).Err(); err != nil {
 		return errors.E(op, errors.Unknown, fmt.Sprintf("redis pubsub publish error: %v", err))
 	}
 	return nil
@@ -849,8 +1047,18 @@ func (r *RDB) RecordSchedulerEnqueueEvent(entryID string, event *base.SchedulerE
 func (r *RDB) ClearSchedulerHistory(entryID string) error {
 	var op errors.Op = "rdb.ClearSchedulerHistory"
 	key := base.SchedulerHistoryKey(entryID)
-	if err := r.client.Del(key).Err(); err != nil {
+	if err := r.client.Del(context.Background(), key).Err(); err != nil {
 		return errors.E(op, errors.Unknown, &errors.RedisCommandError{Command: "del", Err: err})
 	}
 	return nil
 }
+
+// WriteResult writes the given result data for the specified task.
+func (r *RDB) WriteResult(qname, taskID string, data []byte) (int, error) {
+	var op errors.Op = "rdb.WriteResult"
+	taskKey := base.TaskKey(qname, taskID)
+	if err := r.client.HSet(context.Background(), taskKey, "result", data).Err(); err != nil {
+		return 0, errors.E(op, errors.Unknown, &errors.RedisCommandError{Command: "hset", Err: err})
+	}
+	return len(data), nil
+}

internal/testbroker/testbroker.go

@@ -10,7 +10,7 @@ import (
 	"sync"
 	"time"
 
-	"github.com/go-redis/redis/v7"
+	"github.com/go-redis/redis/v8"
 	"github.com/hibiken/asynq/internal/base"
 )
 
@@ -81,6 +81,15 @@ func (tb *TestBroker) Done(msg *base.TaskMessage) error {
 	return tb.real.Done(msg)
 }
 
+func (tb *TestBroker) MarkAsComplete(msg *base.TaskMessage) error {
+	tb.mu.Lock()
+	defer tb.mu.Unlock()
+	if tb.sleeping {
+		return errRedisDown
+	}
+	return tb.real.MarkAsComplete(msg)
+}
+
 func (tb *TestBroker) Requeue(msg *base.TaskMessage) error {
 	tb.mu.Lock()
 	defer tb.mu.Unlock()
@@ -108,13 +117,13 @@ func (tb *TestBroker) ScheduleUnique(msg *base.TaskMessage, processAt time.Time,
 	return tb.real.ScheduleUnique(msg, processAt, ttl)
 }
 
-func (tb *TestBroker) Retry(msg *base.TaskMessage, processAt time.Time, errMsg string) error {
+func (tb *TestBroker) Retry(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.Retry(msg, processAt, errMsg)
+	return tb.real.Retry(msg, processAt, errMsg, isFailure)
 }
 
 func (tb *TestBroker) Archive(msg *base.TaskMessage, errMsg string) error {
@@ -135,6 +144,15 @@ func (tb *TestBroker) ForwardIfReady(qnames ...string) error {
 	return tb.real.ForwardIfReady(qnames...)
 }
 
+func (tb *TestBroker) DeleteExpiredCompletedTasks(qname string) error {
+	tb.mu.Lock()
+	defer tb.mu.Unlock()
+	if tb.sleeping {
+		return errRedisDown
+	}
+	return tb.real.DeleteExpiredCompletedTasks(qname)
+}
+
 func (tb *TestBroker) ListDeadlineExceeded(deadline time.Time, qnames ...string) ([]*base.TaskMessage, error) {
 	tb.mu.Lock()
 	defer tb.mu.Unlock()
@@ -180,6 +198,15 @@ 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()

janitor.go

@@ -0,0 +1,81 @@
+// 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
+}
+
+type janitorParams struct {
+	logger   *log.Logger
+	broker   base.Broker
+	queues   []string
+	interval time.Duration
+}
+
+func newJanitor(params janitorParams) *janitor {
+	return &janitor{
+		logger:      params.logger,
+		broker:      params.broker,
+		done:        make(chan struct{}),
+		queues:      params.queues,
+		avgInterval: params.interval,
+	}
+}
+
+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); err != nil {
+			j.logger.Errorf("Could not delete expired completed tasks from queue %q: %v",
+				qname, err)
+		}
+	}
+}

janitor_test.go

@@ -0,0 +1,89 @@
+// 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"
+	h "github.com/hibiken/asynq/internal/asynqtest"
+	"github.com/hibiken/asynq/internal/base"
+	"github.com/hibiken/asynq/internal/rdb"
+)
+
+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
+	janitor := newJanitor(janitorParams{
+		logger:   testLogger,
+		broker:   rdbClient,
+		queues:   []string{"default", "custom"},
+		interval: interval,
+	})
+
+	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)
+			}
+		}
+	}
+}

processor.go

@@ -16,6 +16,7 @@ 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"
 	"golang.org/x/time/rate"
@@ -33,6 +34,7 @@ type processor struct {
 	orderedQueues []string
 
 	retryDelayFunc RetryDelayFunc
+	isFailureFunc  func(error) bool
 
 	errHandler ErrorHandler
 
@@ -70,6 +72,7 @@ type processorParams struct {
 	logger          *log.Logger
 	broker          base.Broker
 	retryDelayFunc  RetryDelayFunc
+	isFailureFunc   func(error) bool
 	syncCh          chan<- *syncRequest
 	cancelations    *base.Cancelations
 	concurrency     int
@@ -94,6 +97,7 @@ func newProcessor(params processorParams) *processor {
 		queueConfig:     queues,
 		orderedQueues:   orderedQueues,
 		retryDelayFunc:  params.retryDelayFunc,
+		isFailureFunc:   params.isFailureFunc,
 		syncRequestCh:   params.syncCh,
 		cancelations:    params.cancelations,
 		errLogLimiter:   rate.NewLimiter(rate.Every(3*time.Second), 1),
@@ -186,25 +190,35 @@ func (p *processor) exec() {
 				<-p.sema // release token
 			}()
 
-			ctx, cancel := createContext(msg, deadline)
+			ctx, cancel := asynqcontext.New(msg, deadline)
-			p.cancelations.Add(msg.ID.String(), cancel)
+			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, 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 {
@@ -214,18 +228,14 @@ func (p *processor) exec() {
 				p.requeue(msg)
 				return
 			case <-ctx.Done():
-				p.retryOrKill(ctx, msg, ctx.Err())
+				p.handleFailedMessage(ctx, 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, msg, resErr)
 					return
 				}
-				p.markAsDone(ctx, msg)
+				p.handleSucceededMessage(ctx, msg)
 			}
 		}()
 	}
@@ -240,6 +250,34 @@ func (p *processor) requeue(msg *base.TaskMessage) {
 	}
 }
 
+func (p *processor) handleSucceededMessage(ctx context.Context, msg *base.TaskMessage) {
+	if msg.Retention > 0 {
+		p.markAsComplete(ctx, msg)
+	} else {
+		p.markAsDone(ctx, msg)
+	}
+}
+
+func (p *processor) markAsComplete(ctx context.Context, msg *base.TaskMessage) {
+	err := p.broker.MarkAsComplete(msg)
+	if err != nil {
+		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)
+		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.MarkAsComplete(msg)
+			},
+			errMsg:   errMsg,
+			deadline: deadline,
+		}
+	}
+}
+
 func (p *processor) markAsDone(ctx context.Context, msg *base.TaskMessage) {
 	err := p.broker.Done(msg)
 	if err != nil {
@@ -263,22 +301,27 @@ 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) {
+func (p *processor) handleFailedMessage(ctx context.Context, msg *base.TaskMessage, err error) {
 	if p.errHandler != nil {
 		p.errHandler.HandleError(ctx, NewTask(msg.Type, msg.Payload), err)
 	}
+	if !p.isFailureFunc(err) {
+		// retry the task without marking it as failed
+		p.retry(ctx, msg, err, false /*isFailure*/)
+		return
+	}
 	if 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.retry(ctx, msg, err, true /*isFailure*/)
 	}
 }
 
-func (p *processor) retry(ctx context.Context, msg *base.TaskMessage, e error) {
+func (p *processor) retry(ctx context.Context, msg *base.TaskMessage, e error, isFailure bool) {
 	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(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()
@@ -288,7 +331,7 @@ func (p *processor) retry(ctx context.Context, msg *base.TaskMessage, e error) {
 		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(msg, retryAt, e.Error(), isFailure)
 			},
 			errMsg:   errMsg,
 			deadline: deadline,

processor_test.go

@@ -14,11 +14,18 @@ import (
 	"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"
 )
 
+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 +49,34 @@ 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,
+		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 = h
+	return p
+}
+
 func TestProcessorSuccessWithSingleQueue(t *testing.T) {
 	r := setup(t)
 	defer r.Close()
@@ -87,28 +122,7 @@ func TestProcessorSuccessWithSingleQueue(t *testing.T) {
 			processed = append(processed, task)
 			return nil
 		}
-		starting := make(chan *workerInfo)
+		p := newProcessorForTest(t, rdbClient, HandlerFunc(handler))
-		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.start(&sync.WaitGroup{})
 		for _, msg := range tc.incoming {
@@ -119,13 +133,13 @@ func TestProcessorSuccessWithSingleQueue(t *testing.T) {
 			}
 		}
 		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 +193,26 @@ func TestProcessorSuccessWithMultipleQueues(t *testing.T) {
 			processed = append(processed, task)
 			return nil
 		}
-		starting := make(chan *workerInfo)
+		p := newProcessorForTest(t, rdbClient, HandlerFunc(handler))
-		finished := make(chan *base.TaskMessage)
+		p.queueConfig = map[string]int{
-		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.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 +259,17 @@ func TestProcessTasksWithLargeNumberInPayload(t *testing.T) {
 			processed = append(processed, task)
 			return nil
 		}
-		starting := make(chan *workerInfo)
+		p := newProcessorForTest(t, rdbClient, HandlerFunc(handler))
-		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.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()
@@ -386,26 +359,9 @@ func TestProcessorRetry(t *testing.T) {
 			defer mu.Unlock()
 			n++
 		}
-		starting := make(chan *workerInfo)
+		p := newProcessorForTest(t, rdbClient, tc.handler)
-		finished := make(chan *base.TaskMessage)
+		p.errHandler = ErrorHandlerFunc(errHandler)
-		done := make(chan struct{})
+		p.retryDelayFunc = delayFunc
-		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.start(&sync.WaitGroup{})
 		runTime := time.Now() // time when processor is running
@@ -439,7 +395,7 @@ 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 +405,81 @@ 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)
+			}
+		}
+	}
+}
+
 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 +508,10 @@ func TestProcessorQueues(t *testing.T) {
 	}
 
 	for _, tc := range tests {
-		starting := make(chan *workerInfo)
+		// Note: rdb and handler not needed for this test.
-		finished := make(chan *base.TaskMessage)
+		p := newProcessorForTest(t, nil, nil)
-		done := make(chan struct{})
+		p.queueConfig = tc.queueCfg
-		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,
-		})
 		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",
@@ -577,6 +593,7 @@ func TestProcessorWithStrictPriority(t *testing.T) {
 			logger:          testLogger,
 			broker:          rdbClient,
 			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.
@@ -593,13 +610,13 @@ 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 +655,9 @@ 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{
+	p := newProcessorForTest(t, nil, nil)
-		logger: testLogger,
-		queues: defaultQueueConfig,
-	})
 
 	for _, tc := range tests {
 		p.handler = tc.handler

recoverer.go

@@ -5,7 +5,7 @@
 package asynq
 
 import (
-	"fmt"
+	"context"
 	"sync"
 	"time"
 
@@ -17,6 +17,7 @@ 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 +35,7 @@ type recovererParams struct {
 	queues         []string
 	interval       time.Duration
 	retryDelayFunc RetryDelayFunc
+	isFailureFunc  func(error) bool
 }
 
 func newRecoverer(params recovererParams) *recoverer {
@@ -44,6 +46,7 @@ func newRecoverer(params recovererParams) *recoverer {
 		queues:         params.queues,
 		interval:       params.interval,
 		retryDelayFunc: params.retryDelayFunc,
+		isFailureFunc:  params.isFailureFunc,
 	}
 }
 
@@ -81,26 +84,25 @@ func (r *recoverer) recover() {
 		r.logger.Warn("recoverer: could not list deadline exceeded tasks")
 		return
 	}
-	const errMsg = "deadline exceeded"
 	for _, msg := range msgs {
 		if msg.Retried >= msg.Retry {
-			r.archive(msg, errMsg)
+			r.archive(msg, context.DeadlineExceeded)
 		} else {
-			r.retry(msg, errMsg)
+			r.retry(msg, context.DeadlineExceeded)
 		}
 	}
 }
 
-func (r *recoverer) retry(msg *base.TaskMessage, errMsg string) {
+func (r *recoverer) retry(msg *base.TaskMessage, err error) {
-	delay := r.retryDelayFunc(msg.Retried, fmt.Errorf(errMsg), NewTask(msg.Type, msg.Payload))
+	delay := r.retryDelayFunc(msg.Retried, err, NewTask(msg.Type, msg.Payload))
 	retryAt := time.Now().Add(delay)
-	if err := r.broker.Retry(msg, retryAt, errMsg); err != nil {
+	if err := r.broker.Retry(msg, retryAt, err.Error(), r.isFailureFunc(err)); err != nil {
 		r.logger.Warnf("recoverer: could not retry deadline exceeded task: %v", err)
 	}
 }
 
-func (r *recoverer) archive(msg *base.TaskMessage, errMsg string) {
+func (r *recoverer) archive(msg *base.TaskMessage, err error) {
-	if err := r.broker.Archive(msg, errMsg); err != nil {
+	if err := r.broker.Archive(msg, err.Error()); err != nil {
 		r.logger.Warnf("recoverer: could not move task to archive: %v", err)
 	}
 }

recoverer_test.go

@@ -234,6 +234,7 @@ 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
@@ -259,7 +260,7 @@ 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, "context deadline exceeded", 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 +270,7 @@ 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, "context deadline exceeded", 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

@@ -10,7 +10,7 @@ import (
 	"sync"
 	"time"
 
-	"github.com/go-redis/redis/v7"
+	"github.com/go-redis/redis/v8"
 	"github.com/google/uuid"
 	"github.com/hibiken/asynq/internal/base"
 	"github.com/hibiken/asynq/internal/log"
@@ -19,6 +19,8 @@ import (
 )
 
 // 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
@@ -30,6 +32,9 @@ type Scheduler struct {
 	done       chan struct{}
 	wg         sync.WaitGroup
 	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.
@@ -154,17 +159,22 @@ func (s *Scheduler) Register(cronspec string, task *Task, opts ...Option) (entry
 	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
 }

servemux.go

@@ -98,7 +98,7 @@ func (mux *ServeMux) Handle(pattern string, handler Handler) {
 	mux.mu.Lock()
 	defer mux.mu.Unlock()
 
-	if pattern == "" {
+	if strings.TrimSpace(pattern) == "" {
 		panic("asynq: invalid pattern")
 	}
 	if handler == nil {

server.go

@@ -15,7 +15,7 @@ import (
 	"sync"
 	"time"
 
-	"github.com/go-redis/redis/v7"
+	"github.com/go-redis/redis/v8"
 	"github.com/hibiken/asynq/internal/base"
 	"github.com/hibiken/asynq/internal/log"
 	"github.com/hibiken/asynq/internal/rdb"
@@ -49,6 +49,7 @@ type Server struct {
 	subscriber    *subscriber
 	recoverer     *recoverer
 	healthchecker *healthchecker
+	janitor       *janitor
 }
 
 // Config specifies the server's background-task processing behavior.
@@ -64,6 +65,14 @@ type Config struct {
 	// 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.
 	//
@@ -268,6 +277,8 @@ func DefaultRetryDelayFunc(n int, e error, t *Task) time.Duration {
 	return time.Duration(s) * time.Second
 }
 
+func defaultIsFailureFunc(err error) bool { return err != nil }
+
 var defaultQueueConfig = map[string]int{
 	base.DefaultQueueName: 1,
 }
@@ -293,8 +304,15 @@ func NewServer(r RedisConnOpt, cfg Config) *Server {
 	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 {
+			continue // ignore invalid queue names
+		}
 		if p > 0 {
 			queues[qname] = p
 		}
@@ -359,6 +377,7 @@ func NewServer(r RedisConnOpt, cfg Config) *Server {
 		logger:          logger,
 		broker:          rdb,
 		retryDelayFunc:  delayFunc,
+		isFailureFunc:   isFailureFunc,
 		syncCh:          syncCh,
 		cancelations:    cancels,
 		concurrency:     n,
@@ -373,6 +392,7 @@ func NewServer(r RedisConnOpt, cfg Config) *Server {
 		logger:         logger,
 		broker:         rdb,
 		retryDelayFunc: delayFunc,
+		isFailureFunc:  isFailureFunc,
 		queues:         qnames,
 		interval:       1 * time.Minute,
 	})
@@ -382,6 +402,12 @@ func NewServer(r RedisConnOpt, cfg Config) *Server {
 		interval:        healthcheckInterval,
 		healthcheckFunc: cfg.HealthCheckFunc,
 	})
+	janitor := newJanitor(janitorParams{
+		logger:   logger,
+		broker:   rdb,
+		queues:   qnames,
+		interval: 8 * time.Second,
+	})
 	return &Server{
 		logger:        logger,
 		broker:        rdb,
@@ -393,6 +419,7 @@ func NewServer(r RedisConnOpt, cfg Config) *Server {
 		subscriber:    subscriber,
 		recoverer:     recoverer,
 		healthchecker: healthchecker,
+		janitor:       janitor,
 	}
 }
 
@@ -474,6 +501,7 @@ 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)
 	return nil
 }
 
@@ -498,6 +526,7 @@ func (srv *Server) Shutdown() {
 	srv.recoverer.shutdown()
 	srv.syncer.shutdown()
 	srv.subscriber.shutdown()
+	srv.janitor.shutdown()
 	srv.healthchecker.shutdown()
 	srv.heartbeater.shutdown()
 

server_test.go

@@ -19,7 +19,7 @@ import (
 
 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")
+	ignoreOpt := goleak.IgnoreTopFunction("github.com/go-redis/redis/v8/internal/pool.(*ConnPool).reaper")
 	defer goleak.VerifyNoLeaks(t, ignoreOpt)
 
 	redisConnOpt := getRedisConnOpt(t)
@@ -55,7 +55,7 @@ func TestServer(t *testing.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")
+	ignoreOpt := goleak.IgnoreTopFunction("github.com/go-redis/redis/v8/internal/pool.(*ConnPool).reaper")
 	defer goleak.VerifyNoLeaks(t, ignoreOpt)
 
 	srv := NewServer(RedisClientOpt{Addr: ":6379"}, Config{LogLevel: testLogLevel})

subscriber.go

@@ -8,7 +8,7 @@ import (
 	"sync"
 	"time"
 
-	"github.com/go-redis/redis/v7"
+	"github.com/go-redis/redis/v8"
 	"github.com/hibiken/asynq/internal/base"
 	"github.com/hibiken/asynq/internal/log"
 )

tools/asynq/cmd/cron.go

@@ -63,7 +63,7 @@ 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/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

@@ -148,9 +148,9 @@ func printQueueInfo(info *asynq.QueueInfo) {
 	fmt.Printf("Paused: %t\n\n", info.Paused)
 	bold.Println("Task Count by State")
 	printTable(
-		[]string{"active", "pending", "scheduled", "retry", "archived"},
+		[]string{"active", "pending", "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.Scheduled, info.Retry, info.Archived, info.Completed)
 		},
 	)
 	fmt.Println()

tools/asynq/cmd/root.go

@@ -14,7 +14,7 @@ import (
 	"unicode"
 	"unicode/utf8"
 
-	"github.com/go-redis/redis/v7"
+	"github.com/go-redis/redis/v8"
 	"github.com/hibiken/asynq"
 	"github.com/hibiken/asynq/internal/base"
 	"github.com/hibiken/asynq/internal/rdb"
@@ -199,9 +199,9 @@ func printTable(cols []string, printRows func(w io.Writer, tmpl string)) {
 	tw.Flush()
 }
 
-// formatPayload returns string representation of payload if data is printable.
+// sprintBytes returns a string representation of the given byte slice if data is printable.
-// If data is not printable, it returns a string describing payload is not printable.
+// If data is not printable, it returns a string describing it is not printable.
-func formatPayload(payload []byte) string {
+func sprintBytes(payload []byte) string {
 	if !isPrintable(payload) {
 		return "non-printable bytes"
 	}

tools/asynq/cmd/stats.go

@@ -7,11 +7,13 @@ package cmd
 import (
 	"fmt"
 	"io"
+	"math"
 	"os"
 	"strconv"
 	"strings"
 	"text/tabwriter"
 	"time"
+	"unicode/utf8"
 
 	"github.com/fatih/color"
 	"github.com/hibiken/asynq/internal/rdb"
@@ -58,6 +60,7 @@ type AggregateStats struct {
 	Scheduled int
 	Retry     int
 	Archived  int
+	Completed int
 	Processed int
 	Failed    int
 	Timestamp time.Time
@@ -85,6 +88,7 @@ func stats(cmd *cobra.Command, args []string) {
 		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
@@ -124,22 +128,50 @@ func stats(cmd *cobra.Command, args []string) {
 }
 
 func printStatsByState(s *AggregateStats) {
-	format := strings.Repeat("%v\t", 5) + "\n"
+	format := strings.Repeat("%v\t", 6) + "\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, "active", "pending", "scheduled", "retry", "archived", "completed")
-	fmt.Fprintf(tw, format, "----------", "--------", "---------", "-----", "----")
+	width := maxInt(9 /* defaultWidth */, maxWidthOf(s.Active, s.Pending, s.Scheduled, s.Retry, s.Archived, s.Completed)) // length of widest column
-	fmt.Fprintf(tw, format, s.Active, s.Pending, s.Scheduled, s.Retry, s.Archived)
+	sep := strings.Repeat("-", width)
+	fmt.Fprintf(tw, format, sep, sep, sep, sep, sep, sep)
+	fmt.Fprintf(tw, format, s.Active, s.Pending, 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

@@ -86,6 +86,7 @@ The value for the state flag should be one of:
 - scheduled
 - retry
 - archived
+- completed
 
 List opeartion paginates the result set.
 By default, the command fetches the first 30 tasks.
@@ -189,6 +190,8 @@ func taskList(cmd *cobra.Command, args []string) {
 		listRetryTasks(qname, pageNum, pageSize)
 	case "archived":
 		listArchivedTasks(qname, pageNum, pageSize)
+	case "completed":
+		listCompletedTasks(qname, pageNum, pageSize)
 	default:
 		fmt.Printf("error: state=%q is not supported\n", state)
 		os.Exit(1)
@@ -210,7 +213,7 @@ 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 +234,7 @@ 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 +255,7 @@ 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 +287,8 @@ 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),
+				fmt.Fprintf(w, tmpl, t.ID, t.Type, sprintBytes(t.Payload), formatProcessAt(t.NextProcessAt),
-					t.LastErr, formatLastFailedAt(t.LastFailedAt), t.Retried, t.MaxRetry)
+					t.LastErr, formatPastTime(t.LastFailedAt), t.Retried, t.MaxRetry)
 			}
 		},
 	)
@@ -306,7 +309,27 @@ 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))
 			}
 		})
 }
@@ -356,7 +379,7 @@ 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 +394,12 @@ 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 {
+// formatPastTime takes t which is time in the past and returns a user-friendly string.
-	if lastFailedAt.IsZero() || lastFailedAt.Unix() == 0 {
+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) {
@@ -496,6 +520,8 @@ 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)
 	default:
 		fmt.Printf("error: unsupported state %q\n", state)
 		os.Exit(1)

tools/go.mod

@@ -3,21 +3,13 @@ module github.com/hibiken/asynq/tools
 go 1.13
 
 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/go-redis/redis/v8 v8.11.2
-	github.com/golang/protobuf v1.4.1 // indirect
 	github.com/google/uuid v1.2.0
 	github.com/hibiken/asynq v0.17.1
 	github.com/mitchellh/go-homedir v1.1.0
-	github.com/spf13/cast v1.3.1
 	github.com/spf13/cobra v1.1.1
 	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
 )
 
 replace github.com/hibiken/asynq => ./..

tools/go.sum

@@ -18,7 +18,6 @@ github.com/OneOfOne/xxhash v1.2.2/go.mod h1:HSdplMjZKSmBqAxg5vPj2TmRDmfkzw+cTzAE
 github.com/alecthomas/template v0.0.0-20160405071501-a0175ee3bccc/go.mod h1:LOuyumcjzFXgccqObfd/Ljyb9UuFJ6TxHnclSeseNhc=
 github.com/alecthomas/units v0.0.0-20151022065526-2efee857e7cf/go.mod h1:ybxpYRFXyAe+OPACYpWeL0wqObRcbAqCMya13uyzqw0=
 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=
@@ -26,39 +25,39 @@ github.com/beorn7/perks v1.0.0/go.mod h1:KWe93zE9D1o94FZ5RNwFwVgaQK1VOXiVxmqh+Ce
 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/census-instrumentation/opencensus-proto v0.2.1/go.mod h1:f6KPmirojxKA12rnyqOA5BBL4O983OfeGPqjHWSTneU=
+github.com/cespare/xxhash v1.1.0 h1:a6HrQnmkObjyL+Gs60czilIUGqrzKutQD6XZog3p+ko=
 github.com/cespare/xxhash v1.1.0/go.mod h1:XrSqR1VqqWfGrhpAt58auRo0WTKS1nRRg3ghfAqPWnc=
+github.com/cespare/xxhash/v2 v2.1.1 h1:6MnRN8NT7+YBpUIWxHtefFZOKTAPgGjpQSxqLNn0+qY=
+github.com/cespare/xxhash/v2 v2.1.1/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=
+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/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=
 github.com/envoyproxy/protoc-gen-validate v0.1.0/go.mod h1:iSmxcyjqTsJpI2R4NaDN7+kN2VEUnK/pcBlmesArF7c=
 github.com/fatih/color v1.7.0/go.mod h1:Zm6kSWBoL9eyXnKyktHP6abPY2pDugNf5KwzbycvMj4=
 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=
 github.com/fsnotify/fsnotify v1.4.7/go.mod h1:jwhsz4b93w/PPRr/qN1Yymfu8t87LnFCMoQvtojpjFo=
+github.com/fsnotify/fsnotify v1.4.9 h1:hsms1Qyu0jgnwNXIxa+/V/PDsU6CfLf6CNO8H7IWoS4=
+github.com/fsnotify/fsnotify v1.4.9/go.mod h1:znqG4EE+3YCdAaPaxE2ZRY/06pZUdp0tY4IgpuI1SZQ=
 github.com/ghodss/yaml v1.0.0/go.mod h1:4dBDuWmgqj2HViK6kFavaiC9ZROes6MMH2rRYeMEF04=
 github.com/go-gl/glfw v0.0.0-20190409004039-e6da0acd62b1/go.mod h1:vR7hzQXu2zJy9AVAgeJqvqgH9Q5CA+iKCZ2gyEVpxRU=
 github.com/go-kit/kit v0.8.0/go.mod h1:xBxKIO96dXMWWy0MnWVtmwkA9/13aqxPnvrjFYMA2as=
 github.com/go-logfmt/logfmt v0.3.0/go.mod h1:Qt1PoO58o5twSAckw1HlFXLmHsOX5/0LbT9GBnD5lWE=
 github.com/go-logfmt/logfmt v0.4.0/go.mod h1:3RMwSq7FuexP4Kalkev3ejPJsZTpXXBr9+V4qmtdjCk=
-github.com/go-redis/redis/v7 v7.2.0 h1:CrCexy/jYWZjW0AyVoHlcJUeZN19VWlbepTh1Vq6dJs=
+github.com/go-redis/redis/v8 v8.11.2 h1:WqlSpAwz8mxDSMCvbyz1Mkiqe0LE5OY4j3lgkvu1Ts0=
-github.com/go-redis/redis/v7 v7.2.0/go.mod h1:JDNMw23GTyLNC4GZu9njt15ctBQVn7xjRfnwdHj/Dcg=
+github.com/go-redis/redis/v8 v8.11.2/go.mod h1:DLomh7y2e3ggQXQLd1YgmvIfecPJoFl7WU5SOQ/r06M=
-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-stack/stack v1.8.0/go.mod h1:v0f6uXyyMGvRgIKkXu+yp6POWl0qKG85gN/melR3HDY=
 github.com/gogo/protobuf v1.1.1/go.mod h1:r8qH/GZQm5c6nD/R0oafs1akxWv10x8SbQlK7atdtwQ=
 github.com/gogo/protobuf v1.2.1/go.mod h1:hp+jE20tsWTFYpLwKvXlhS1hjn+gTNwPg2I6zVXpSg4=
@@ -69,36 +68,34 @@ github.com/golang/mock v1.2.0/go.mod h1:oTYuIxOrZwtPieC+H1uAHpcLFnEyAGVDL/k47Jfb
 github.com/golang/mock v1.3.1/go.mod h1:sBzyDLLjw3U8JLTeZvSv8jJB+tU5PVekmnlKIyFUx0Y=
 github.com/golang/protobuf v1.2.0/go.mod h1:6lQm79b+lXiMfvg/cZm0SGofjICqVBUtrP5yJMmIC1U=
 github.com/golang/protobuf v1.3.1/go.mod h1:6lQm79b+lXiMfvg/cZm0SGofjICqVBUtrP5yJMmIC1U=
-github.com/golang/protobuf v1.3.2 h1:6nsPYzhq5kReh6QImI3k5qWzO4PEbvbIW2cwSfR/6xs=
 github.com/golang/protobuf v1.3.2/go.mod h1:6lQm79b+lXiMfvg/cZm0SGofjICqVBUtrP5yJMmIC1U=
 github.com/golang/protobuf v1.4.0-rc.1/go.mod h1:ceaxUfeHdC40wWswd/P6IGgMaK3YpKi5j83Wpe3EHw8=
 github.com/golang/protobuf v1.4.0-rc.1.0.20200221234624-67d41d38c208/go.mod h1:xKAWHe0F5eneWXFV3EuXVDTCmh+JuBKY0li0aMyXATA=
 github.com/golang/protobuf v1.4.0-rc.2/go.mod h1:LlEzMj4AhA7rCAGe4KMBDvJI+AwstrUpVNzEA03Pprs=
 github.com/golang/protobuf v1.4.0-rc.4.0.20200313231945-b860323f09d0/go.mod h1:WU3c8KckQ9AFe+yFwt9sWVRKCVIyN9cPHBJSNnbL67w=
 github.com/golang/protobuf v1.4.0/go.mod h1:jodUvKwWbYaEsadDk5Fwe5c77LiNKVO9IDvqG2KuDX0=
-github.com/golang/protobuf v1.4.1 h1:ZFgWrT+bLgsYPirOnRfKLYJLvssAegOj/hgyMFdJZe0=
 github.com/golang/protobuf v1.4.1/go.mod h1:U8fpvMrcmy5pZrNK1lt4xCsGvpyWQ/VVv6QDs8UjoX8=
+github.com/golang/protobuf v1.4.2 h1:+Z5KGCizgyZCbGh1KZqA0fcLLkwbsjIzS4aV2v7wJX0=
+github.com/golang/protobuf v1.4.2/go.mod h1:oDoupMAO8OvCJWAcko0GGGIgR6R6ocIYbsSw735rRwI=
 github.com/google/btree v0.0.0-20180813153112-4030bb1f1f0c/go.mod h1:lNA+9X1NB3Zf8V7Ke586lFgjr2dZNuvo3lPJSGZ5JPQ=
 github.com/google/btree v1.0.0/go.mod h1:lNA+9X1NB3Zf8V7Ke586lFgjr2dZNuvo3lPJSGZ5JPQ=
 github.com/google/go-cmp v0.2.0/go.mod h1:oXzfMopK8JAjlY9xF4vHSVASa0yLyX7SntLO5aqRK0M=
 github.com/google/go-cmp v0.3.0/go.mod h1:8QqcDgzrUqlUb/G2PQTWiueGozuR1884gddMywk6iLU=
 github.com/google/go-cmp v0.3.1/go.mod h1:8QqcDgzrUqlUb/G2PQTWiueGozuR1884gddMywk6iLU=
-github.com/google/go-cmp v0.4.0 h1:xsAVV57WRhGj6kEIi8ReJzQlHHqcBYCElAvkovg3B/4=
 github.com/google/go-cmp v0.4.0/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
 github.com/google/go-cmp v0.5.0/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
+github.com/google/go-cmp v0.5.6 h1:BKbKCqvP6I+rmFHt06ZmyQtvB8xAkWdhFyr0ZUNZcxQ=
+github.com/google/go-cmp v0.5.6/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
 github.com/google/martian v2.1.0+incompatible/go.mod h1:9I4somxYTbIHy5NJKHRl3wXiIaQGbYVAs8BPL6v8lEs=
 github.com/google/pprof v0.0.0-20181206194817-3ea8567a2e57/go.mod h1:zfwlbNMJ+OItoe0UupaVj+oy1omPYYDuagoSzA8v9mc=
 github.com/google/pprof v0.0.0-20190515194954-54271f7e092f/go.mod h1:zfwlbNMJ+OItoe0UupaVj+oy1omPYYDuagoSzA8v9mc=
 github.com/google/renameio v0.1.0/go.mod h1:KWCgfxg9yswjAJkECMjeO8J8rahYeXnNhOm40UhjYkI=
-github.com/google/uuid v1.1.1 h1:Gkbcsh/GbpXz7lPftLA3P6TYMwjCLYm83jiFQZF/3gY=
-github.com/google/uuid v1.1.1/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo=
 github.com/google/uuid v1.2.0 h1:qJYtXnJRWmpe7m/3XlyhrsLrEURqHRM2kxzoxXqyUDs=
 github.com/google/uuid v1.2.0/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo=
 github.com/googleapis/gax-go/v2 v2.0.4/go.mod h1:0Wqv26UfaUD9n4G6kQubkQ+KchISgw+vpHVxEJEs9eg=
 github.com/googleapis/gax-go/v2 v2.0.5/go.mod h1:DWXyrwAJ9X0FpwwEdw+IPEYBICEFu5mhpdKc/us6bOk=
 github.com/gopherjs/gopherjs v0.0.0-20181017120253-0766667cb4d1 h1:EGx4pi6eqNxGaHF6qqu48+N2wcFQ5qg5FXgOdqsJ5d8=
 github.com/gopherjs/gopherjs v0.0.0-20181017120253-0766667cb4d1/go.mod h1:wJfORRmW1u3UXTncJ5qlYoELFm8eSnnEO6hX4iZ3EWY=
-github.com/gorilla/websocket v1.4.0/go.mod h1:E7qHFY5m1UJ88s3WnNqhKjPHQ0heANvMoAMk2YaljkQ=
 github.com/gorilla/websocket v1.4.2/go.mod h1:YR8l580nyteQvAITg2hZ9XVh4b55+EU/adAjf1fMHhE=
 github.com/grpc-ecosystem/go-grpc-middleware v1.0.0/go.mod h1:FiyG127CGDf3tlThmgyCl78X/SZQqEOJBCDaAfeWzPs=
 github.com/grpc-ecosystem/go-grpc-prometheus v1.2.0/go.mod h1:8NvIoxWQoOIhqOTXgfV/d3M/q6VIi02HzZEHgUlZvzk=
@@ -124,7 +121,6 @@ github.com/hashicorp/logutils v1.0.0/go.mod h1:QIAnNjmIWmVIIkWDTG1z5v++HQmx9WQRO
 github.com/hashicorp/mdns v1.0.0/go.mod h1:tL+uN++7HEJ6SQLQ2/p+z2pH24WQKWjBPkE0mNTz8vQ=
 github.com/hashicorp/memberlist v0.1.3/go.mod h1:ajVTdAv/9Im8oMAAj5G31PhhMCZJV2pPBoIllUwCN7I=
 github.com/hashicorp/serf v0.8.2/go.mod h1:6hOLApaqBFA1NXqRQAsxw9QxuDEvNxSQRwA/JwenrHc=
-github.com/hpcloud/tail v1.0.0 h1:nfCOvKYfkgYP8hkirhJocXT2+zOD8yUNjXaWfTlyFKI=
 github.com/hpcloud/tail v1.0.0/go.mod h1:ab1qPbhIpdTxEkNHXyeSf5vhxWSCs/tWer42PpOxQnU=
 github.com/inconshreveable/mousetrap v1.0.0 h1:Z8tu5sraLXCXIcARxBp/8cbvlwVa7Z1NHg9XEKhtSvM=
 github.com/inconshreveable/mousetrap v1.0.0/go.mod h1:PxqpIevigyE2G7u3NXJIT2ANytuPF1OarO4DADm73n8=
@@ -143,7 +139,6 @@ github.com/kr/pretty v0.1.0/go.mod h1:dAy3ld7l9f0ibDNOQOHHMYYIIbhfbHSm3C4ZsoJORN
 github.com/kr/pty v1.1.1/go.mod h1:pFQYn66WHrOpPYNljwOMqo10TkYh1fy3cYio2l3bCsQ=
 github.com/kr/text v0.1.0 h1:45sCR5RtlFHMR4UwH9sdQ5TC8v0qDQCHnXt+kaKSTVE=
 github.com/kr/text v0.1.0/go.mod h1:4Jbv+DJW3UT/LiOwJeYQe1efqtUx/iVham/4vfdArNI=
-github.com/magiconair/properties v1.8.0/go.mod h1:PppfXfuXeibc/6YijjN8zIbojt8czPbwD3XqdrwzmxQ=
 github.com/magiconair/properties v1.8.1 h1:ZC2Vc7/ZFkGmsVC9KvOjumD+G5lXy2RtTKyzRKO2BQ4=
 github.com/magiconair/properties v1.8.1/go.mod h1:PppfXfuXeibc/6YijjN8zIbojt8czPbwD3XqdrwzmxQ=
 github.com/mattn/go-colorable v0.0.9/go.mod h1:9vuHe8Xs5qXnSaW/c/ABM9alt+Vo+STaOChaDxuIBZU=
@@ -168,12 +163,17 @@ github.com/mitchellh/mapstructure v1.1.2/go.mod h1:FVVH3fgwuzCH5S8UJGiWEs2h04kUh
 github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd/go.mod h1:6dJC0mAP4ikYIbvyc7fijjWJddQyLn8Ig3JB5CqoB9Q=
 github.com/modern-go/reflect2 v1.0.1/go.mod h1:bx2lNnkwVCuqBIxFjflWJWanXIb3RllmbCylyMrvgv0=
 github.com/mwitkow/go-conntrack v0.0.0-20161129095857-cc309e4a2223/go.mod h1:qRWi+5nqEBWmkhHvq77mSJWrCKwh8bxhgT7d/eI7P4U=
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@@ -196,7 +196,6 @@ github.com/robfig/cron/v3 v3.0.1 h1:WdRxkvbJztn8LMz/QEvLN5sBU+xKpSqwwUO1Pjr4qDs=
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@@ -213,49 +212,41 @@ github.com/spf13/afero v1.1.2/go.mod h1:j4pytiNVoe2o6bmDsKpLACNPDBIoEAkihy7loJ1B
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@@ -274,6 +265,7 @@ golang.org/x/mobile v0.0.0-20190312151609-d3739f865fa6/go.mod h1:z+o9i4GpDbdi3rU
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@@ -287,11 +279,12 @@ golang.org/x/net v0.0.0-20190311183353-d8887717615a/go.mod h1:t9HGtf8HONx5eT2rtn
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@@ -300,6 +293,7 @@ golang.org/x/sync v0.0.0-20181108010431-42b317875d0f/go.mod h1:RxMgew5VJxzue5/jJ
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@@ -307,7 +301,6 @@ golang.org/x/sys v0.0.0-20180909124046-d0be0721c37e/go.mod h1:STP8DvDyc/dI5b8T5h
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@@ -316,14 +309,19 @@ golang.org/x/sys v0.0.0-20190502145724-3ef323f4f1fd/go.mod h1:h1NjWce9XRLGQEsW7w
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 golang.org/x/sys v0.0.0-20190624142023-c5567b49c5d0/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
-golang.org/x/sys v0.0.0-20191010194322-b09406accb47/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20190904154756-749cb33beabd/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20191005200804-aed5e4c7ecf9/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20191026070338-33540a1f6037/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
-golang.org/x/sys v0.0.0-20191204072324-ce4227a45e2e h1:9vRrk9YW2BTzLP0VCB9ZDjU4cPqkg+IDWL7XgxA1yxQ=
+golang.org/x/sys v0.0.0-20191120155948-bd437916bb0e/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
-golang.org/x/sys v0.0.0-20191204072324-ce4227a45e2e/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20200323222414-85ca7c5b95cd/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20200930185726-fdedc70b468f/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20210112080510-489259a85091 h1:DMyOG0U+gKfu8JZzg2UQe9MeaC1X+xQWlAKcRnjxjCw=
+golang.org/x/sys v0.0.0-20210112080510-489259a85091/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
 golang.org/x/text v0.3.1-0.20180807135948-17ff2d5776d2/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
-golang.org/x/text v0.3.2 h1:tW2bmiBqwgJj/UpqtC8EpXEZVYOwU0yG4iWbprSVAcs=
 golang.org/x/text v0.3.2/go.mod h1:bEr9sfX3Q8Zfm5fL9x+3itogRgK3+ptLWKqgva+5dAk=
+golang.org/x/text v0.3.3 h1:cokOdA+Jmi5PJGXLlLllQSgYigAEfHXJAERHVMaCc2k=
+golang.org/x/text v0.3.3/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
 golang.org/x/time v0.0.0-20181108054448-85acf8d2951c/go.mod h1:tRJNPiyCQ0inRvYxbN9jk5I+vvW/OXSQhTDSoE431IQ=
 golang.org/x/time v0.0.0-20190308202827-9d24e82272b4 h1:SvFZT6jyqRaOeXpc5h/JSfZenJ2O330aBsf7JfSUXmQ=
 golang.org/x/time v0.0.0-20190308202827-9d24e82272b4/go.mod h1:tRJNPiyCQ0inRvYxbN9jk5I+vvW/OXSQhTDSoE431IQ=
@@ -345,9 +343,13 @@ 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=
 golang.org/x/tools v0.0.0-20191112195655-aa38f8e97acc/go.mod h1:b+2E5dAYhXwXZwtnZ6UAqBI28+e2cm9otk0dWdXHAEo=
+golang.org/x/tools v0.0.0-20191119224855-298f0cb1881e/go.mod h1:b+2E5dAYhXwXZwtnZ6UAqBI28+e2cm9otk0dWdXHAEo=
+golang.org/x/tools v0.0.0-20201224043029-2b0845dc783e/go.mod h1:emZCQorbCU4vsT4fOWvOPXz4eW1wZW4PmDk9uLelYpA=
 golang.org/x/xerrors v0.0.0-20190717185122-a985d3407aa7/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
-golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543 h1:E7g+9GITq07hpfrRu66IVDexMakfv52eLZ2CXBWiKr4=
+golang.org/x/xerrors v0.0.0-20191011141410-1b5146add898/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
 golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
+golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1 h1:go1bK/D/BFZV2I8cIQd1NKEZ+0owSTG1fDTci4IqFcE=
+golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
 google.golang.org/api v0.4.0/go.mod h1:8k5glujaEP+g9n7WNsDg8QP6cUVNI86fCNMcbazEtwE=
 google.golang.org/api v0.7.0/go.mod h1:WtwebWUNSVBH/HAw79HIFXZNqEvBhG+Ra+ax0hx3E3M=
 google.golang.org/api v0.8.0/go.mod h1:o4eAsZoiT+ibD93RtjEohWalFOjRDx6CVaqeizhEnKg=
@@ -369,7 +371,6 @@ 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=
@@ -379,6 +380,7 @@ 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=
 google.golang.org/protobuf v1.21.0/go.mod h1:47Nbq4nVaFHyn7ilMalzfO3qCViNmqZ2kzikPIcrTAo=
 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=
@@ -388,7 +390,6 @@ gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127/go.mod h1:Co6ibVJAznAaIkqp8
 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=
@@ -397,12 +398,12 @@ gopkg.in/tomb.v1 v1.0.0-20141024135613-dd632973f1e7 h1:uRGJdciOHaEIrze2W8Q3AKkep
 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 v2.2.8/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
+gopkg.in/yaml.v2 v2.3.0 h1:clyUAQHOM3G0M3f5vQj7LuJrETvjVot3Z5el9nffUtU=
+gopkg.in/yaml.v2 v2.3.0/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
+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=

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/go-redis/redis/v8"
+	"github.com/hibiken/asynq"
+	asynqcontext "github.com/hibiken/asynq/internal/context"
+)
+
+// 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 fmt.Sprintf("asynq:sema:%s", scope)
+}

x/rate/semaphore_test.go

@@ -0,0 +1,408 @@
+package rate
+
+import (
+	"context"
+	"flag"
+	"fmt"
+	"strings"
+	"testing"
+	"time"
+
+	"github.com/go-redis/redis/v8"
+	"github.com/google/uuid"
+	"github.com/hibiken/asynq"
+	"github.com/hibiken/asynq/internal/base"
+	asynqcontext "github.com/hibiken/asynq/internal/context"
+)
+
+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(&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(&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(&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(&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(&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(&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
+}