ETCD超級簡單的使用入門示例

1、啓動ETCD

@echo off

etcd.exe --config-file etcd.conf.yml

pause

etcd.conf.yml

name: etcd
listen-client-urls: http://0.0.0.0:2379
advertise-client-urls: http://0.0.0.0:2379

2、編寫客戶端：

package main

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

var (
	dialTimout = 5*time.Second
	requestTimeout = 10*time.Second
	endpoints = []string{"127.0.0.1:2379",}
)

func main() {
	cli, err := clientv3.New(clientv3.Config{
		Endpoints: endpoints,
		DialTimeout: dialTimout,
	})
	if err != nil {
		log.Fatal(err)
		fmt.Printf("connect to etcd failed, err:%v\n", err);
		return
	}
	defer cli.Close()

	//子線程中去修改
	go func() {
		//Put
		ctx, cancel := context.WithTimeout(context.Background(), time.Second)
		putresp, err := cli.Put(ctx, "testdir/testkey", "hello_etcd")
		cancel()
		if err != nil {
			fmt.Printf("put to etcd failed, err:%v\n", err)
			return
		}
		fmt.Println(putresp)

		//Get
		ctx, cancel = context.WithTimeout(context.Background(), time.Second)
		resp, err := cli.Get(ctx, "testdir/testkey")
		cancel()
		if err != nil {
			fmt.Printf("get from etcd failed, err:%v\n", err)
			return
		}
		for _, ev := range resp.Kvs {
			fmt.Printf("%s:%s\n", ev.Key, ev.Value)
		}

		//Del
		ctx, cancel = context.WithTimeout(context.Background(), time.Second)
		delresp, err := cli.Delete(ctx, "testdir/testkey")
		cancel()
		if err != nil {
			fmt.Printf("delete from etcd failed, err:%v\n", err)
			return
		}
		fmt.Println(delresp)
	}()

	//Watch
	fmt.Println("watch begin...")
	ctx, cancel := context.WithTimeout(context.Background(), time.Second)
	wchan := cli.Watch(ctx,"testdir/testkey")
	for wresp := range wchan {
		for _, ev := range wresp.Events{
			fmt.Printf("watch: %s %q:%q\n", ev.Type, ev.Kv.Key, ev.Kv.Value)
		}
	}
	fmt.Println("watch end...")
	cancel()
}

3、查看結果;

watch begin...
watch: PUT "testdir/testkey":"hello_etcd"
&{cluster_id:14841639068965178418 member_id:10276657743932975437 revision:27 raft_term:4  <nil>}
testdir/testkey:hello_etcd
&{cluster_id:14841639068965178418 member_id:10276657743932975437 revision:28 raft_term:4  1 []}
watch: DELETE "testdir/testkey":""
watch end...

Process finished with exit code 0