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143 lines
3.5 KiB
Markdown
143 lines
3.5 KiB
Markdown
# Asynq [](https://travis-ci.com/hibiken/asynq)
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Simple, efficent asynchronous task processing library in Go.
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## Table of Contents
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- [Overview](#overview)
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- [Requirements](#requirements)
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- [Installation](#installation)
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- [Getting Started](#getting-started)
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- [License](#license)
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## Overview
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Asynq provides a simple interface to asynchronous task processing.
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Asynq also ships with a CLI to monitor the queues and take manual actions if needed.
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Asynq provides:
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- Clear separation of task producer and consumer
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- Ability to schedule task processing in the future
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- Automatic retry of failed tasks with exponential backoff
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- Ability to configure max retry count per task
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- Ability to configure max number of worker goroutines to process tasks
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- Unix signal handling to safely shutdown background processing
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- Enhanced reliability TODO(hibiken): link to wiki page describing this.
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- CLI to query and mutate queues state for mointoring and administrative purposes
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## Requirements
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- Redis: 2.6+
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- Go: 1.12+
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## Installation
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```
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go get github.com/hibiken/asynq
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```
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## Getting Started
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1. Import `asynq` in your file.
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```go
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import "github.com/hibiken/asynq"
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```
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2. Create a `Client` instance to create tasks.
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```go
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func main() {
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client := asynq.NewClient(&asynq.RedisOpt{
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Addr: "localhost:6379",
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})
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t1 := asynq.Task{
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Type: "send_welcome_email",
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Payload: map[string]interface{}{
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"recipient_id": 1234,
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},
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}
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t2 := asynq.Task{
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Type: "send_reminder_email",
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Payload: map[string]interface{}{
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"recipient_id": 1234,
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},
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}
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// process the task immediately.
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err := client.Process(&t1, time.Now())
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// process the task 24 hours later.
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err = client.Process(&t2, time.Now().Add(24 * time.Hour))
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// specify the max number of retry (default: 25)
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err = client.Process(&t1, time.Now(), asynq.MaxRetry(1))
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}
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```
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3. Create a `Background` instance to process tasks.
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```go
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func main() {
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bg := asynq.NewBackground(10, &asynq.RedisOpt{
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Addr: "localhost:6379",
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})
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// Blocks until signal TERM or INT is received.
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// For graceful shutdown, send signal TSTP to stop processing more tasks
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// before sending TERM or INT signal.
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bg.Run(handler)
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}
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```
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The argument to `(*asynq.Background).Run` is an interface `asynq.Handler` which has one method `ProcessTask`.
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```go
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// ProcessTask should return nil if the processing of a task
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// is successful.
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//
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// If ProcessTask return a non-nil error or panics, the task
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// will be retried.
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type Handler interface {
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ProcessTask(*Task) error
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}
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```
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The simplest way to implement a handler is to define a function with the same signature and use `asynq.HandlerFunc` adapter type when passing it to `Run`.
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```go
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func handler(t *asynq.Task) error {
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switch t.Type {
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case "send_welcome_email":
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id, err := t.Payload.GetInt("recipient_id")
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if err != nil {
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return err
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}
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fmt.Printf("Send Welcome Email to %d\n", id)
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// ... handle other types ...
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default:
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return fmt.Errorf("unexpected task type: %s", t.Type)
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}
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return nil
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}
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func main() {
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bg := asynq.NewBackground(10, &asynq.RedisOpt{
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Addr: "localhost:6379",
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})
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// Use asynq.HandlerFunc adapter for a handler function
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bg.Run(asynq.HandlerFunc(handler))
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}
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```
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## License
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Asynq is released under the MIT license. See [LICENSE](https://github.com/hibiken/asynq/blob/master/LICENSE).
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