golang框架中限流和熔断的算法和数据结构是什么？

package main

import (
    "context"
    "fmt"
    "net/http"
    "time"

    "github.com/gin-gonic/gin"
    "github.com/juju/ratelimit"
)

func main() {
    r := gin.Default()

    // 创建限流器，令牌桶算法，每秒最多允许 10 个请求
    limiter := ratelimit.NewBucket(time.Second*1, 10)

    // 限流中间件
    r.Use(func(c *gin.Context) {
        // 尝试从限流器获取令牌
        if !limiter.Allow() {
            c.AbortWithStatus(http.StatusTooManyRequests)
            return
        }
        c.Next()
    })

    // 创建熔断器
    breaker := NewBreaker(10, time.Minute*1)

    // 熔断中间件
    r.Use(func(c *gin.Context) {
        // 检测熔断器状态
        if breaker.IsTripped() {
            c.AbortWithStatus(http.StatusServiceUnavailable)
            return
        }

        // 执行请求
        if _, err := c.Writer.Write([]byte("Hello world!")); err != nil {
            breaker.MarkFailed()
        } else {
            breaker.MarkSuccessful()
        }

        c.Next()
    })

    r.GET("/", func(c *gin.Context) {
        c.JSON(http.StatusOK, gin.H{"message": "Hello world!"})
    })

    r.Run(":8080")
}