golang 速度限制，time.Tick(time.Second*2) channel，隔2秒后继续执行

package main



import (

    "fmt"

    "time"

)



func main() {

    requests := make(chan int, 5)

    for i := 1; i <= 2; i++ {

        requests <- i

    }

    close(requests)

    limiter := time.Tick(time.Millisecond * 200)



    for req := range requests { //会循环两次，前面往requests channel中发送了两个值

        <-limiter  //执行到这里，需要隔 200毫秒才继续往下执行，time.Tick(timer)上面已定义

        fmt.Println("request", req, time.Now())

    }



    burstyLimiter := make(chan time.Time, 3)



    for i := 0; i < 3; i++ {

        burstyLimiter <- time.Now()  //这里burstyLimiter channel 连续发送了三次值

    }



    go func() {

        for t := range time.Tick(time.Second * 2) {

            burstyLimiter <- t // 这里往burstyLimiter channel 循环发送time.Tick

        }

    }()

    burstyRequests := make(chan int, 5)



    for i := 1; i <= 5; i++ {

        burstyRequests <- i

        <-burstyLimiter  //前三次没有速度限制，会直接打印出后面的println的内容

        fmt.Println("request", i, time.Now())

    }



    close(burstyRequests)

    for req := range burstyRequests {

        <-burstyLimiter  //继续接收burstyLimiter值，除了前三次，后面的都是time.Tick进行速度限制,2秒打印一次，直到此次循环结束

        fmt.Println("request", req, time.Now())

    }

}

注，把time.Tick(time.Second)中的值改为秒会更容易查看效果