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Remove redis.Client type from asynq package API

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Ken Hibino 2020-01-14 21:19:06 -08:00
parent cb2ebf18ac
commit 43d7591250
5 changed files with 178 additions and 52 deletions
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78
README.md
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@ -1,8 +1,10 @@
# Asynq
[![Build Status](https://travis-ci.com/hibiken/asynq.svg?token=paqzfpSkF4p23s5Ux39b&branch=master)](https://travis-ci.com/hibiken/asynq) [![License: MIT](https://img.shields.io/badge/License-MIT-green.svg)](https://opensource.org/licenses/MIT)
[![Build Status](https://travis-ci.com/hibiken/asynq.svg?token=paqzfpSkF4p23s5Ux39b&branch=master)](https://travis-ci.com/hibiken/asynq) [![License: MIT](https://img.shields.io/badge/license-MIT-green.svg)](https://opensource.org/licenses/MIT)
Simple, efficent asynchronous task processing library in Go.
Simple and efficent asynchronous task processing library in Go.
**Important Note**: Current major version is zero (v0.x.x) to accomodate rapid development and fast iteration while getting early feedback from users. The public API could change without a major version update before the release of verson 1.0.0.
## Table of Contents
@ -10,6 +12,7 @@ Simple, efficent asynchronous task processing library in Go.
- [Requirements](#requirements)
- [Installation](#installation)
- [Getting Started](#getting-started)
- [Monitoring CLI](#monitoring-cli)
- [Acknowledgements](#acknowledgements)
- [License](#license)
@ -27,44 +30,49 @@ Asynq provides:
- Ability to configure max retry count per task
- Ability to configure max number of worker goroutines to process tasks
- Unix signal handling to safely shutdown background processing
- Enhanced reliability TODO(hibiken): link to wiki page describing this.
- CLI to query and mutate queues state for mointoring and administrative purposes
## Requirements
| Dependency | Version |
| -------------------------------------------------------------- | ------- |
| [Redis](https://redis.io/) | v2.6+ |
| [Go](https://golang.org/) | v1.12+ |
| [github.com/go-redis/redis](https://github.com/go-redis/redis) | v.7.0+ |
| Dependency | Version |
| -------------------------- | ------- |
| [Redis](https://redis.io/) | v2.8+ |
| [Go](https://golang.org/) | v1.12+ |
## Installation
```
go get github.com/hibiken/asynq
go get -u github.com/hibiken/asynq
```
## Getting Started
1. Import `asynq` and `redis` in your file.
1. Import `asynq` in your file.
```go
import (
"github.com/go-redis/redis/v7"
"github.com/hibiken/asynq"
)
import "github.com/hibiken/asynq"
```
2. Create a `Client` instance to create tasks.
2. Use one of `RedisConnOpt` types to specify how to connect to Redis.
```go
var redis = &asynq.RedisClientOpt{
Addr: "localhost:6379",
// Omit if no password is required
Password: "mypassword",
// Use a dedicated db number for asynq.
// By default, Redis offers 16 databases (0..15)
DB: 0,
}
```
3. Create a `Client` instance to create and schedule tasks.
```go
func main() {
r := redis.NewClient(&redis.Options{
Addr: "localhost:6379",
}
client := asynq.NewClient(r)
client := asynq.NewClient(redis)
// create a task with typename and payload.
// Create a task with typename and payload.
t1 := asynq.NewTask(
"send_welcome_email",
map[string]interface{}{"user_id": 42})
@ -73,35 +81,34 @@ func main() {
"send_reminder_email",
map[string]interface{}{"user_id": 42})
// process the task immediately.
// Process the task immediately.
err := client.Schedule(t1, time.Now())
// process the task 24 hours later.
// Process the task 24 hours later.
err = client.Schedule(t2, time.Now().Add(24 * time.Hour))
// specify the max number of retry (default: 25)
// Specify the max number of retry (default: 25)
err = client.Schedule(t1, time.Now(), asynq.MaxRetry(1))
}
```
3. Create a `Background` instance to process tasks.
4. Create a `Background` instance to process tasks.
```go
func main() {
r := redis.NewClient(&redis.Options{
Addr: "localhost:6379",
}
bg := asynq.NewBackground(r, &asynq.Config{
Concurrency: 20,
bg := asynq.NewBackground(redis, &asynq.Config{
Concurrency: 10,
})
// Blocks until signal TERM or INT is received.
// For graceful shutdown, send signal TSTP to stop processing more tasks
// before sending TERM or INT signal.
// before sending TERM or INT signal to terminate the process.
bg.Run(handler)
}
```
Note that `Client` and `Background` are intended to be used in separate executable binaries.
The argument to `(*asynq.Background).Run` is an interface `asynq.Handler` which has one method `ProcessTask`.
```go
@ -136,11 +143,8 @@ func handler(t *asynq.Task) error {
}
func main() {
r := redis.NewClient(&redis.Options{
Addr: "localhost:6379",
}
bg := asynq.NewBackground(r, &asynq.Config{
Concurrency: 20,
bg := asynq.NewBackground(redis, &asynq.Config{
Concurrency: 10,
})
// Use asynq.HandlerFunc adapter for a handler function
@ -148,6 +152,10 @@ func main() {
}
```
## Monitoring CLI
TODO(hibiken): Describe basic usage of `asynqmon` CLI
## Acknowledgements
- [Sidekiq](https://github.com/mperham/sidekiq) : Many of the design ideas are taken from sidekiq and its Web UI

116
asynq.go
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@ -4,10 +4,12 @@
package asynq
/*
TODOs:
- [P0] Go docs
*/
import (
"crypto/tls"
"fmt"
"github.com/go-redis/redis/v7"
)
// Task represents a task to be performed.
type Task struct {
@ -28,3 +30,109 @@ func NewTask(typename string, payload map[string]interface{}) *Task {
Payload: Payload{payload},
}
}
// RedisConnOpt is a discriminated union of redis-client-option types.
//
// RedisConnOpt represents a sum of following types:
// RedisClientOpt | *RedisClientOpt | RedisFailoverClientOpt | *RedisFailoverClientOpt
type RedisConnOpt interface{}
// RedisClientOpt is used to specify redis client options to connect
// to a redis server running as a stand alone instance.
type RedisClientOpt struct {
// Network type to use, either tcp or unix.
// Default is tcp.
Network string
// Redis server address in the format 'host:port'.
Addr string
// Redis server password.
Password string
// Redis DB to select after connecting to the server.
// See: https://redis.io/commands/select.
DB int
// Maximum number of socket connections.
// Default is 10 connections per every CPU as reported by runtime.NumCPU.
PoolSize int
// TLS Config used to connect to the server.
// TLS will be negotiated only if this field is set.
TLSConfig *tls.Config
}
// RedisFailoverClientOpt is used to specify redis failover client.
type RedisFailoverClientOpt struct {
// Redis master name that monitored by sentinels.
MasterName string
// Addresses of sentinels in the form "host:port".
// Use at least three sentinels to avoid problems described in
// https://redis.io/topics/sentinel.
SentinelAddrs []string
// Redis sentinel password.
SentinelPassword string
// Redis server password.
Password string
// Redis DB to select after connecting to the server.
// See: https://redis.io/commands/select.
DB int
// Maximum number of socket connections.
// Default is 10 connections per every CPU as reported by runtime.NumCPU.
PoolSize int
// TLS Config used to connect to the server.
// TLS will be negotiated only if this field is set.
TLSConfig *tls.Config
}
func createRedisClient(r RedisConnOpt) *redis.Client {
switch r := r.(type) {
case *RedisClientOpt:
return redis.NewClient(&redis.Options{
Network: r.Network,
Addr: r.Addr,
Password: r.Password,
DB: r.DB,
PoolSize: r.PoolSize,
TLSConfig: r.TLSConfig,
})
case RedisClientOpt:
return redis.NewClient(&redis.Options{
Network: r.Network,
Addr: r.Addr,
Password: r.Password,
DB: r.DB,
PoolSize: r.PoolSize,
TLSConfig: r.TLSConfig,
})
case *RedisFailoverClientOpt:
return redis.NewFailoverClient(&redis.FailoverOptions{
MasterName: r.MasterName,
SentinelAddrs: r.SentinelAddrs,
SentinelPassword: r.SentinelPassword,
Password: r.Password,
DB: r.DB,
PoolSize: r.PoolSize,
TLSConfig: r.TLSConfig,
})
case RedisFailoverClientOpt:
return redis.NewFailoverClient(&redis.FailoverOptions{
MasterName: r.MasterName,
SentinelAddrs: r.SentinelAddrs,
SentinelPassword: r.SentinelPassword,
Password: r.Password,
DB: r.DB,
PoolSize: r.PoolSize,
TLSConfig: r.TLSConfig,
})
default:
panic(fmt.Sprintf("unexpected type %T for RedisConnOpt", r))
}
}

5
background.go
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@ -15,7 +15,6 @@ import (
"syscall"
"time"
"github.com/go-redis/redis/v7"
"github.com/hibiken/asynq/internal/base"
"github.com/hibiken/asynq/internal/rdb"
)
@ -95,7 +94,7 @@ var defaultQueueConfig = map[string]uint{
// NewBackground returns a new Background instance given a redis client
// and background processing configuration.
func NewBackground(r *redis.Client, cfg *Config) *Background {
func NewBackground(r RedisConnOpt, cfg *Config) *Background {
n := cfg.Concurrency
if n < 1 {
n = 1
@ -110,7 +109,7 @@ func NewBackground(r *redis.Client, cfg *Config) *Background {
}
qcfg := normalizeQueueCfg(queues)
rdb := rdb.NewRDB(r)
rdb := rdb.NewRDB(createRedisClient(r))
scheduler := newScheduler(rdb, 5*time.Second, qcfg)
processor := newProcessor(rdb, n, qcfg, cfg.StrictPriority, delayFunc)
return &Background{

5
client.go
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@ -8,7 +8,6 @@ import (
"strings"
"time"
"github.com/go-redis/redis/v7"
"github.com/hibiken/asynq/internal/base"
"github.com/hibiken/asynq/internal/rdb"
"github.com/rs/xid"
@ -25,8 +24,8 @@ type Client struct {
}
// NewClient and returns a new Client given a redis configuration.
func NewClient(r *redis.Client) *Client {
rdb := rdb.NewRDB(r)
func NewClient(r RedisConnOpt) *Client {
rdb := rdb.NewRDB(createRedisClient(r))
return &Client{rdb}
}

26
doc.go
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@ -5,15 +5,27 @@
/*
Package asynq provides a framework for background task processing.
Asynq uses Redis as a message broker. To connect to redis server,
specify the options using one of RedisConnOpt types.
redis = &asynq.RedisClientOpt{
Addr: "localhost:6379",
Password: "secretpassword",
DB: 3,
}
The Client is used to register a task to be processed at the specified time.
client := asynq.NewClient(redis)
Task is created with two parameters: its type and payload.
t := asynq.NewTask(
"send_email",
map[string]interface{}{"user_id": 42})
client := asynq.NewClient(redis)
err := client.Schedule(t, time.Now().Add(time.Minute))
t := asynq.NewTask(
"send_email",
map[string]interface{}{"user_id": 42})
// Schedule the task t to be processed a minute from now.
err := client.Schedule(t, time.Now().Add(time.Minute))
The Background is used to run the background task processing with a given
handler.
@ -26,7 +38,7 @@ handler.
Handler is an interface with one method ProcessTask which
takes a task and returns an error. Handler should return nil if
the processing is successful, otherwise return a non-nil error.
If handler returns a non-nil error, the task will be retried in the future.
If handler panics or returns a non-nil error, the task will be retried in the future.
Example of a type that implements the Handler interface.
type TaskHandler struct {
@ -42,7 +54,7 @@ Example of a type that implements the Handler interface.
// generate thumbnail image
//...
default:
return fmt.Errorf("unepected task type %q", task.Type)
return fmt.Errorf("unexpected task type %q", task.Type)
}
return nil
}