scheduler

scheduler

中文文档

Introduction

scheduler is a job scheduling package for Go. It provides a simple, humans-friendly way to schedule the execution of the go function and includes delay and periodic.

Inspired by Linux cron and Python schedule.

Features

• Delay execution, accurate to a second
• Periodic execution, accurate to a second, like the cron style but more flexible
• Cancel job
• Failure retry

Installation

go get github.com/prprprus/scheduler

Example

job function

func task1(name string, age int) {
	fmt.Printf("run task1, with arguments: %s, %d\n", name, age)
}

func task2() {
	fmt.Println("run task2, without arguments")
}

Delay

Delayed supports four modes: seconds, minutes, hours, and days.

package main

import (
    "fmt"

    "github.com/prprprus/scheduler"
)

func main() {
	s, err := scheduler.NewScheduler(1000)
	if err != nil {
		panic(err) // just example
	}

	// delay with 1 second, job function with arguments
	jobID := s.Delay().Second(1).Do(task1, "prprprus", 23)

	// delay with 1 minute, job function without arguments
	jobID = s.Delay().Minute(1).Do(task2)

	// delay with 1 hour
	jobID = s.Delay().Hour(1).Do(task2)

	// Note: execute immediately
	jobID = s.Delay().Do(task2)

	// cancel job
	jobID = s.Delay().Day(1).Do(task2)
	err = s.CancelJob(jobID)
	if err != nil {
		panic(err)
	} else {
		fmt.Println("cancel delay job success")
	}
}

Every

Like the cron style, it also includes seconds, minutes, hours, days, weekday, and months, but the order and number are not fixed. You can freely arrange and combine them according to your own preferences. For example, the effects of Second(3).Minute(35).Day(6) and Minute(35).Day(6).Second(3) are the same. No need to remember the format! 🎉👏

But for the readability, recommend the chronological order from small to large (or large to small).

Note: Day() and Weekday() avoid simultaneous occurrences unless you know that the day is the day of the week.

package main

import (
    "fmt"

    "github.com/prprprus/scheduler"
)

func main() {
	s, err := scheduler.NewScheduler(1000)
	if err != nil {
		panic(err) // just example
	}

	// Specifies time to execute periodically
	jobID = s.Every().Second(45).Minute(20).Hour(13).Day(23).Weekday(3).Month(6).Do(task1, "prprprus", 23)
	jobID = s.Every().Second(15).Minute(40).Hour(16).Weekday(4).Do(task2)
	jobID = s.Every().Second(1).Do(task1, "prprprus", 23)

	// Note: execute immediately
	jobID = s.Every().Do(task2)

	jobID = s.Every().Second(1).Minute(1).Hour(1).Do(task2)
	err = s.CancelJob(jobID)
	if err != nil {
		panic(err)
	} else {
		fmt.Println("cancel periodically job success")
	}
}

Documentation

Full documentation

Contribution

Thank you for your interest in contribution of scheduler, your help and contribution is very valuable.

You can submit issue and pull requests and fork, please submit an issue before submitting pull requests.

License

See LICENSE for more information.

have fun✨👻✨