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https://github.com/reugn/go-quartz

Minimalist and zero-dependency scheduling library for Go
https://github.com/reugn/go-quartz

cron crontab go golang job job-queue job-scheduler jobqueue quartz scheduler zero-dependency

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Minimalist and zero-dependency scheduling library for Go

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# go-quartz



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[![codecov](https://codecov.io/gh/reugn/go-quartz/branch/master/graph/badge.svg)](https://codecov.io/gh/reugn/go-quartz)



A minimalistic and zero-dependency scheduling library for Go.



## About



Inspired by the [Quartz](https://github.com/quartz-scheduler/quartz) Java scheduler.



### Library building blocks



#### Scheduler interface



```go

type Scheduler interface {

	// Start starts the scheduler. The scheduler will run until

	// the Stop method is called or the context is canceled. Use

	// the Wait method to block until all running jobs have completed.

	Start(context.Context)



	// IsStarted determines whether the scheduler has been started.

	IsStarted() bool



	// ScheduleJob schedules a job using a specified trigger.

	ScheduleJob(jobDetail *JobDetail, trigger Trigger) error



	// GetJobKeys returns the keys of all of the scheduled jobs.

	GetJobKeys() []*JobKey



	// GetScheduledJob returns the scheduled job with the specified key.

	GetScheduledJob(jobKey *JobKey) (ScheduledJob, error)



	// DeleteJob removes the job with the specified key from the

	// scheduler's execution queue.

	DeleteJob(jobKey *JobKey) error



	// Clear removes all of the scheduled jobs.

	Clear() error



	// Wait blocks until the scheduler stops running and all jobs

	// have returned. Wait will return when the context passed to

	// it has expired. Until the context passed to start is

	// cancelled or Stop is called directly.

	Wait(context.Context)



	// Stop shutdowns the scheduler.

	Stop()

}

```



Implemented Schedulers



- StdScheduler



#### Trigger interface



```go

type Trigger interface {

	// NextFireTime returns the next time at which the Trigger is scheduled to fire.

	NextFireTime(prev int64) (int64, error)



	// Description returns the description of the Trigger.

	Description() string

}

```



Implemented Triggers



- CronTrigger

- SimpleTrigger

- RunOnceTrigger



#### Job interface



Any type that implements it can be scheduled.



```go

type Job interface {

	// Execute is called by a Scheduler when the Trigger associated with this job fires.

	Execute(context.Context) error



	// Description returns the description of the Job.

	Description() string

}

```



Several common Job implementations can be found in the [job](./job) package.



## Cron expression format



| Field Name   | Mandatory | Allowed Values  | Allowed Special Characters |

| ------------ | --------- | --------------- | -------------------------- |

| Seconds      | YES       | 0-59            | , - * /                    |

| Minutes      | YES       | 0-59            | , - * /                    |

| Hours        | YES       | 0-23            | , - * /                    |

| Day of month | YES       | 1-31            | , - * ? /                  |

| Month        | YES       | 1-12 or JAN-DEC | , - * /                    |

| Day of week  | YES       | 1-7 or SUN-SAT  | , - * ? /                  |

| Year         | NO        | empty, 1970-    | , - * /                    |



## Distributed mode



The scheduler can use its own implementation of `quartz.JobQueue` to allow state sharing.  

An example implementation of the job queue using the file system as a persistence layer

can be found [here](./examples/queue/file_system.go).



## Logger



To set a custom logger, use the `logger.SetDefault` function.  

The argument must implement the `logger.Logger` interface.



The following example shows how to disable library logs.



```go

import "github.com/reugn/go-quartz/logger"



logger.SetDefault(logger.NewSimpleLogger(nil, logger.LevelOff))

```



## Examples



```go

package main



import (

	"context"

	"net/http"

	"time"



	"github.com/reugn/go-quartz/job"

	"github.com/reugn/go-quartz/quartz"

)



func main() {

	ctx, cancel := context.WithCancel(context.Background())

	defer cancel()



	// create scheduler

	sched := quartz.NewStdScheduler()



	// async start scheduler

	sched.Start(ctx)



	// create jobs

	cronTrigger, _ := quartz.NewCronTrigger("1/5 * * * * *")

	shellJob := job.NewShellJob("ls -la")



	request, _ := http.NewRequest(http.MethodGet, "https://worldtimeapi.org/api/timezone/utc", nil)

	curlJob := job.NewCurlJob(request)



	functionJob := job.NewFunctionJob(func(_ context.Context) (int, error) { return 42, nil })



	// register jobs to scheduler

	sched.ScheduleJob(quartz.NewJobDetail(shellJob, quartz.NewJobKey("shellJob")),

		cronTrigger)

	sched.ScheduleJob(quartz.NewJobDetail(curlJob, quartz.NewJobKey("curlJob")),

		quartz.NewSimpleTrigger(time.Second*7))

	sched.ScheduleJob(quartz.NewJobDetail(functionJob, quartz.NewJobKey("functionJob")),

		quartz.NewSimpleTrigger(time.Second*5))



	// stop scheduler

	sched.Stop()



	// wait for all workers to exit

	sched.Wait(ctx)

}

```



More code samples can be found in the examples directory.



## License



Licensed under the MIT License.