goLang 实现限制 服务器文件上传和下载的速度

一个采用令牌桶算法的第三方包，可以帮助我们实现速率限制:

    package main

    import (
        "bytes"
        "fmt"
        "io"
        "time"

        "github.com/juju/ratelimit"
    )

    func main() {
        // Source holding 1MB
        src := bytes.NewReader(make([]byte, 1024*1024))
        // Destination
        dst := &bytes.Buffer{}

        // Bucket adding 100KB every second, holding max 100KB
        bucket := ratelimit.NewBucketWithRate(100*1024, 100*1024)

        start := time.Now()

        // Copy source to destination, but wrap our reader with rate limited one
        io.Copy(dst, ratelimit.Reader(src, bucket