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                            ~~~
package main

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

func main() {

    cli, err := clientv3.New(clientv3.Config{
        Endpoints:   []string{"localhost:2379", "localhost:22379", "localhost:32379"},
        DialTimeout: 5 * time.Second,
    })
    if err != nil {
        fmt.Println("connect failed, err:", err)
        return
    }

    fmt.Println("connect succ")
    defer cli.Close()

    cli.Put(context.Background(), "/logagent/conf/", "8888888")
    for {
        // watch key 監聽節點
        rch := cli.Watch(context.Background(), "/logagent/conf/")
        for wresp := range rch {
            for _, ev := range wresp.Events {
                fmt.Printf("%s %q : %q\n", ev.Type, ev.Kv.Key, ev.Kv.Value)
            }
        }
    }
}

~~~



開啟窗口1：
~~~
go run main.go 
~~~
返回結果：
~~~
connect succ
~~~
開啟窗口2：
~~~
go run main.go 
~~~
返回結果：
~~~
connect succ

同時窗口1 返回：
PUT "/logagent/conf/" : "8888888"
~~~

                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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