golang中使用etcd

package main

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

func main(){
    var (
        config clientv3.Config
        err error
        client *clientv3.Client
    )
    //配置
    config = clientv3.Config{
        Endpoints:[]string{"192.168.1.188:2379"},
        DialTimeout:time.Second*5,
    }
    //连接
    if client,err = clientv3.New(config);err != nil{
        fmt.Println(err)
        return
    }
    client=client
}

package main

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

func main(){
    var (
        config clientv3.Config
        err error
        client *clientv3.Client
        kv clientv3.KV
        putResp *clientv3.PutResponse

    )
    //配置
    config = clientv3.Config{
        Endpoints:[]string{"192.168.1.188:2379"},
        DialTimeout:time.Second*5,
    }
    //连接 床见一个客户端
    if client,err = clientv3.New(config);err != nil{
        fmt.Println(err)
        return
    }
    //用于读写etcd的键值对
    kv = clientv3.NewKV(client)
    putResp, err = kv.Put(context.TODO(),"/cron/jobs/job1","bye",clientv3.WithPrevKV())
    if err != nil{
        fmt.Println(err)
    }else{
        //获取版本信息
        fmt.Println("Revision:",putResp.Header.Revision)
        if putResp.PrevKv != nil{
            fmt.Println("key:",string(putResp.PrevKv.Key))
            fmt.Println("Value:",string(putResp.PrevKv.Value))
            fmt.Println("Version:",string(putResp.PrevKv.Version))
        }
    }
}

Revision: 10
key: /cron/jobs/job1
Value: hello
Version: