This package provides crontab tickers to golang apps, supporting crontab-like syntax like * * * * * or */2 * * * * etc.
go get github.com/mileusna/crontab
package main
import (
"fmt"
"log"
"github.com/mileusna/crontab"
)
func main() {
ctab := crontab.New() // create cron table
// MustAddJob is like AddJob but panics on wrong syntax or problems with func/args
// use for easier initialization
ctab.MustAddJob("* * * * *", myFunc) // every minute
ctab.MustAddJob("0 12 * * *", myFunc3) // noon lauch
// fn with args
ctab.MustAddJob("0 0 * * 1,2", myFunc2, "Monday and Tuesday midnight", 123)
ctab.MustAddJob("*/5 * * * *", myFunc2, "every five min", 0)
// or use AddJob if you want to test the error
err := ctab.AddJob("0 12 1 * *", myFunc) // on 1st day of month
if err != nil {
log.Println(err)
return
}
// all your other app code as usual, or put sleep timer for demo
// time.Sleep(10 * time.Minute)
}
func myFunc() {
fmt.Println("Helo, world")
}
func myFunc3() {
fmt.Println("Noon!")
}
func myFunc2(s string, n int) {
fmt.Println("We have params here, string", s, "and number", n)
}If you are not faimiliar with crontab syntax you might be better with other similar packages. But here are few quick references about crontab syntax.
* * * * *
^ ^ ^ ^ ^
| | | | |
| | | | +----- day of week (0-6) (Sunday=0)
| | | +------- month (1-12)
| | +--------- day of month (1-31)
| +----------- hour (0-23)
+------------- min (0-59)
* * * * *run on every minuta10 * * * *run at 0:10, 1:10 etc10 15 * * *run at 10:15 every day* * 1 * *run on every minute on 1st day of month0 0 1 1 *Happy new year schedule0 0 * * 1Run at midnight on every Monday
* 10,15,19 * * *run at 10:00, 15:00 and 19:001-15 * * * *run at 1, 2, 3...15 minute of each hour0 0-5,10 * * *run on every hour from 0-5 and in 10 oclock
*/2 * * * *run every two minutes10 */3 * * *run every 3 hours on 10th min0 12 */2 * *run at noon on every two days1-59/2 * * *run every two minutes, but on odd minutes
There is no way to reschedule or to remove single job from crontab during runtime. (Re)create new instance of crontab to reschedule during runtime or use crontab.Clear() function and add jobs if you prefere.