golang操作etcd

windows 安装 etcd
https://www.jianshu.com/p/2cc988ea2191

# 执行命令
go get go.etcd.io/etcd/clientv3

执行可能会报错, 需替换grpc版本

修改go.mod

module etcd

go 1.17

replace google.golang.org/grpc => google.golang.org/grpc v1.26.0

package main

import (
    "context"
    "fmt"
    "github.com/coreos/etcd/clientv3"
    "strconv"
    "time"
)

func main() {
    endpoints := []string{
        "127.0.0.1:2379",
    }
    client3, err := clientv3.New(
        clientv3.Config{
            Endpoints: endpoints,
        },
    )

    if err != nil {
        panic(err.Error())
    }

    // etcdctl put  写入
    response, err := client3.Put(context.TODO(), "name", "zhangsan")
    if err != nil {
        panic(err.Error())
    }
    fmt.Println(response)

    // etcdctl put  写入
    response4, err := client3.Put(context.TODO(), "web4", "web4444444")
    if err != nil {
        panic(err.Error())
    }
    fmt.Println(response4)

    // etcdctl get 获取
    getResponse, err := client3.Get(context.TODO(), "name")
    if err != nil {
        panic(err.Error())
    }
    for _, kv := range getResponse.Kvs {
        fmt.Println(kv)
        fmt.Println(string(kv.Key), string(kv.Value))
    }

    // etcdctl get --prefix 获取带前缀的key的值
    getAll, err := client3.Get(context.TODO(), "web", clientv3.WithPrefix())
    if err != nil {
        panic(err.Error())
    }
    for _, kv1 := range getAll.Kvs {
        fmt.Println(kv1)
        fmt.Println(string(kv1.Key), string(kv1.Value))
    }

    // etcdctl del 刪除元素
    deleteResponse, err := client3.Delete(context.TODO(), "name")
    if err != nil {
        panic(err.Error())
    }
    fmt.Println(deleteResponse)

    // etcdctl watch 监控一个key的变化 程序会卡在这不动 一直监控着watch监控的key值的变化 通过channel管道进行的监控 所以无时无刻不在监控 所以呢主进程不会死掉的！
    //watch := client3.Watch(context.TODO(), "web")
    //for wc := range watch {
    //  for _, w := range wc.Events {
    //      fmt.Println(string(w.Kv.Key), string(w.Kv.Value), w.Type.String())
    //  }
    //}

    // etcdctl lease grant 20 租赁时长是20s 20s之后就自动过期了！
    grantResponse, err := client3.Grant(context.TODO(), 20)
    if err != nil {
        panic(err.Error())
    }
    if _, err := client3.Put(context.TODO(), "wangxuancheng", "abcdefg", clientv3.WithLease(grantResponse.ID)); err != nil {
        panic(err.Error())
    }
    fmt.Println("ok")

    // 测试租赁是否成功
    i := 0
    for {
        ps, err := client3.Get(context.TODO(), "wangxuancheng")
        if err != nil {
            panic(err.Error())
        }
        for _, kv := range ps.Kvs {
            fmt.Println(string(kv.Key) + "----" + string(kv.Value))
        }
        i += 5
        fmt.Println(strconv.Itoa(i) + "s")
        time.Sleep(5 * time.Second)
    }

}