golang對etcd存取和數值監測

測試代碼如下

package main

import (
    "fmt"
    "log"
    "time"

    "go.etcd.io/etcd/clientv3"
    "golang.org/x/net/context"
)

var (
    dialTimeout    = 5 * time.Second
    requestTimeout = 2 * time.Second
    endpoints      = []string{"192.168.99.106:2379", "192.168.99.107:2379", "192.168.99.108:2379"}
)

func main() {
    cli, err := clientv3.New(clientv3.Config{
        Endpoints:   endpoints,
        DialTimeout: dialTimeout,
    })

    if err != nil {
        log.Fatal(err)
    }

    defer cli.Close()

    key1, value1 := "testkey1", "value"

    ctx, cancel := context.WithTimeout(context.Background(), requestTimeout)
    _, err = cli.Put(ctx, key1, value1)
    cancel()
    if err != nil {
        log.Println("Put failed. ", err)
    } else {
        log.Printf("Put {%s:%s} succeed\n", key1, value1)
    }

    ctx, cancel = context.WithTimeout(context.Background(), requestTimeout)
    resp, err := cli.Get(ctx, key1)
    cancel()
    if err != nil {
        log.Println("Get failed. ", err)
        return
    }

    for _, kv := range resp.Kvs {
        log.Printf("Get {%s:%s} \n", kv.Key, kv.Value)
    }

    done := make(chan bool)

    go func() {
        wch := cli.Watch(context.Background(), key1)

        for item := range wch {
            for _, ev := range item.Events {
                log.Printf("Type:%s, key:%s, value:%s\n", ev.Type, ev.Kv.Key, ev.Kv.Value)
            }
        }
    }()

    go func() {
        for cnt := 0; cnt < 11; cnt++ {
            value := fmt.Sprintf("%s%d", "value", cnt)
            _, err = cli.Put(context.Background(), key1, value)
            if err != nil {
                log.Println("Put failed. ", err)
            } else {
                log.Printf("Put {%s:%s} succeed\n", key1, value)
            }
        }
    }()

    <-done

    log.Println("Done!")
}

測試結果如下