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package discovery
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import (
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"log"
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"os"
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"os/signal"
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)
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// 服务的类型接口
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type Service interface {
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Name() string
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Addr() string
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}
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// orderService
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type OrderService struct {
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name string
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addr string
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}
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func (s OrderService) Name() string {
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return s.name
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}
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func (s OrderService) Addr() string {
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return s.addr
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}
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func ServiceOrder(addr string) {
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// 一:初始化orderService
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orderService := OrderService{
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name: "order",
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addr: addr,
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}
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// 二:获取RegistrarEtcd
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re, err := NewRegistrarEtcd([]string{"localhost:2379"}) // redis(6379)
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if err != nil {
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log.Fatalln(err)
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}
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// 三:将初始化orderService注册到RegistrarEtcd中
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if err := re.Register(orderService); err != nil {
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log.Fatalln(err)
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}
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// 四:阻塞执行
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log.Printf("service %s(%s) is running", orderService.Name(), orderService.Addr())
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// 监控系统的终止信号,来撤销租约
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chInt := make(chan os.Signal, 1)
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signal.Notify(chInt, os.Interrupt) // 监控终止ctrl+c(interrupt)的信号
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// 多路复用channel监控语句
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select {
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case <-chInt:
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if err := re.DeRegister(); err != nil {
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log.Fatalln(err)
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}
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log.Printf("service %s(%s) was deregisted", orderService.Name(), orderService.Addr())
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}
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}
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func ServiceDriver() {
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// 初始化服务发现中间件
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de, err := NewDiscoveryEtcd([]string{"localhost:2379"})
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if err != nil {
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log.Fatalln(err)
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}
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// 发现order服务
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servcieName := "order"
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addr, err := de.GetServiceAddr(servcieName)
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if err != nil {
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log.Fatalln(err)
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}
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log.Printf("servie %s was discoveried on %s\n", servcieName, addr)
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// 连接到目标服务,在微服务架构中,是grpc
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// 调用(请求)目标服务的资源
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}
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