func NewService() *Service {

    config := clientv3.Config{

        Endpoints:   []string{"106.12.72.181:23791", "106.12.72.181:23792"},

        DialTimeout: 10 * time.Second,

    }

    client, _ := clientv3.New(config)

    return &Service{client: client}

}

func (this *Service) RegService(id string, name string, address string) error {

    fmt.Println(22)

    kv := clientv3.NewKV(this.client)

    key_prefix := "/services/"

    _, err := kv.Put(context.Background(), key_prefix+id+"/"+name, address)

    fmt.Println(err)

    return err

}