[TOC] ## 示例 ### client ``` package main import ( "fmt" "github.com/afex/hystrix-go/hystrix" "log" "net" "net/http" "os" "os/signal" "syscall" "time" ) func main() { hystrix.ConfigureCommand("default", hystrix.CommandConfig{ Timeout: 1000, // 单次请求 超时时间 MaxConcurrentRequests: 10, // 最大并发量 SleepWindow: 5000, // 熔断后多久去尝试服务是否可用 RequestVolumeThreshold: 1, // 验证熔断的 请求数量, 10秒内采样 ErrorPercentThreshold: 1, // 验证熔断的 错误百分比 }) //开启一个http监控服务 //可以使用hystrix-dashboard面板查看具体情况 //https://github.com/mlabouardy/hystrix-dashboard-docker hystrixStreamHandler := hystrix.NewStreamHandler() hystrixStreamHandler.Start() go func() { err := http.ListenAndServe(net.JoinHostPort("", "8888"), hystrixStreamHandler) log.Fatal(err) }() for i := 0; i < 100000; i++ { Do(i) } quit := make(chan os.Signal) signal.Notify(quit, syscall.SIGINT, syscall.SIGTERM) <-quit } func Do(params int) { err := hystrix.Do("defalut", func() error { fmt.Println(params) return nil }, nil) if err != nil { //加入自动降级处理，如获取缓存数据等 switch err { case hystrix.ErrCircuitOpen: fmt.Println("circuit error:" + err.Error()) case hystrix.ErrMaxConcurrency: fmt.Println("circuit error:" + err.Error()) default: fmt.Println("circuit error:" + err.Error()) } time.Sleep(1 * time.Second) log.Println("sleep 1 second") } } ```