1. 監視某一個節點

watcher:= kAPI.Watcher("workers/",&client.WatcherOptions{Recursive:true,})for{res,err:=watcher.Next(context.Background())iferr!=nil{log.Println("Error watch workers:",err)break}ifres.Action=="expire"{member,ok:=m.members[res.Node.Key]ifok{member.InGroup=false}}elseifres.Action=="set"||
 
res.Action=="update"{info:=&WorkerInfo{}err:=json.Unmarshal([]byte(res.Node.Value),info)iferr!=nil{log.Print(err)}if_,ok:=m.members[info.Name];ok{m.UpdateWorker(info)}else{m.AddWorker(info)}}elseifres.Action=="delete"{delete(m.members,res.Node.Key)}}

2. Create a Config and exchange it for a Client:
 

import (
	"net/http"

	"github.com/coreos/etcd/client"
	"golang.org/x/net/context"
)

cfg := client.Config{
	Endpoints: []string{"http://127.0.0.1:2379"},
	Transport: DefaultTransport,
}

c, err := client.New(cfg)
if err != nil {
	// handle error
}

Clients are safe for concurrent use by multiple goroutines.

3. Create a KeysAPI using the Client, then use it to interact with etcd:
 

kAPI := client.NewKeysAPI(c)

// create a new key /foo with the value "bar"
_, err = kAPI.Create(context.Background(), "/foo", "bar")
if err != nil {
	// handle error
}

// delete the newly created key only if the value is still "bar"
_, err = kAPI.Delete(context.Background(), "/foo", &DeleteOptions{PrevValue: "bar"})
if err != nil {
	// handle error
}

4. Use a custom context to set timeouts on your operations:

import "time"

ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
defer cancel()

// set a new key, ignoring it's previous state
_, err := kAPI.Set(ctx, "/ping", "pong", nil)
if err != nil {
	if err == context.DeadlineExceeded {
		// request took longer than 5s
	} else {
		// handle error
	}
}

參考： https://godoc.org/github.com/coreos/etcd/client

https://github.com/coreos/etcd/blob/master/client/README.md

http://daizuozhuo.github.io/etcd-service-discovery/

注意： 此文章只是我個人筆記， 如有錯漏，請一定指正， 共同學習， 我的郵箱: [email protected]