Etcd client golang example code

1. 监视某一个节点

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
	}
}
参考: 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: 此文章只是我个人笔记, 如有错漏,请一定指正, 共同学习, 我的邮箱: htyu_0203_39@sina.com

本文来自:CSDN博客

感谢作者:htyu_0203_39

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