golang实现etcd存取和数值监测

测试代码如下

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!")
}

测试结果如下

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