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[Golang] Create multiple CRON functions by looping through a list

Posted on February 4, 2023 By nim No Comments on [Golang] Create multiple CRON functions by looping through a list

Gần dây mình có tình viết 1 scheduler bằng Golang.
và mình định sử dụng

gopkg.in/robfig/cron.v3

import (
    "fmt"

    "gopkg.in/robfig/cron.v3"
)

func test(x int) {
    fmt.Println("acessesing device", x)
}
func main() {
    c := cron.New()
    x := make(chan bool)
    devices := [10]int{1,2,3,4,5,6,7,8,9,10}
    for _, va := range devices {
        c.AddFunc("@every 30s", func() { test(va) })
    }

    c.Start()
    <-x
}

khi đó thì bạn sẽ thấy là dụ sài vòng for nhưng kết quả điều giống nhau.

Nhưng mình mong muốn là như thế này:

Vậy fix sao:

https://stackoverflow.com/questions/57095167/how-do-i-create-multiple-cron-function-by-looping-through-a-list

Problem in your code is equivalent to the one described here:

https://github.com/golang/go/wiki/CommonMistakes#using-goroutines-on-loop-iterator-variables

To fix it:

for _, va := range devices {
    va := va // create a new "va" variable on each iteration
    c.AddFunc("@every 30s", func() { test(va) })
}
Golang

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