如何用Go语言和Redis实现API限流

package main

import (
    "fmt"
    "github.com/go-redis/redis"
    "time"
)

const (
    MaxReqPerSec = 100 // 每秒最大请求数
)

func main() {
    client := redis.NewClient(&redis.Options{
        Addr:     "localhost:6379",
        Password: "", // 如果有密码，填入密码
        DB:       0,  // 默认数据库
    })

    // 初始化令牌桶
    client.Set("bucket", MaxReqPerSec, 0)

    // 模拟请求
    for i := 0; i < 1000; i++ {
        if allowed, err := checkAPIRequest(client); allowed {
            // 执行API请求
            fmt.Println("API request allowed")
            // ....
        } else {
            fmt.Println("API request denied")
            // ....
        }
        time.Sleep(time.Millisecond * 100)
    }
}

func checkAPIRequest(client *redis.Client) (bool, error) {
    val, err := client.Decr("bucket").Result()
    if err != nil {
        return false, err
    }

    if val < 0 {
        client.Incr("bucket")
        return false, nil
    }

    return true, nil
}