golang 速度限制

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())
        }
    }