# 4.7 调用Sentinel

# 4.7.1 简介

对官方库的二次封装。

# 4.7.2 配置规范

配置说明

# 4.7.3 用法

访问redis示例

// run: go run main.go --config=config.toml

package main

import (
	"fmt"
	"math/rand"
	"time"

	"github.com/douyu/jupiter/pkg/util/xgo"
	"github.com/douyu/jupiter"
	"github.com/douyu/jupiter/pkg/sentinel"
	"github.com/douyu/jupiter/pkg/util/xtime"
	"github.com/douyu/jupiter/pkg/xlog"
)

type Engine struct {
	jupiter.Application
}

func NewEngine() *Engine {
	eng := &Engine{}
	if err := eng.Startup(
		eng.exampleSentinel,
	); err != nil {
		xlog.Panic("startup", xlog.Any("err", err))
	}
	return eng
}

func main() {
	app := NewEngine()
	if err := app.Run(); err != nil {
		panic(err)
	}
}

func (eng *Engine) exampleSentinel() (err error) {
	err = sentinel.StdConfig("test").Build()
	if err != nil {
		panic(fmt.Sprintf("sentinel init failed: %s", err.Error()))
	}

	for k := 0; k < 20; k++ {
		xgo.Go(func() {
			e, b := sentinel.Entry("some-test")
			if b != nil {
				// 请求被拒绝,在此处进行处理
				time.Sleep(time.Duration(rand.Uint64()%10) * time.Millisecond)
			} else {
				// 请求允许通过,此处编写业务逻辑
				fmt.Println(xtime.CurrentTimeMillis(), "Passed")
				time.Sleep(time.Duration(rand.Uint64()%10) * time.Millisecond)

				// 务必保证业务结束后调用 Exit
				e.Exit()
			}
		})
	}

	return
}

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执行 go run main.go --config=config.toml,可以看到如下图结果 image