Hello World
最后更新于：2022-04-02 02:40:56
[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")
}
}
```
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