etcd

type Client interface {
	Watch(key string, opts ...clientv3.OpOption)
	Put(key string, value string, timeout time.Duration, opts ...clientv3.OpOption) (resp *clientv3.PutResponse, err error)
	Get(key string) (value interface{}, exists bool)
	GetRemote(key string, timeout time.Duration) (kvs []*mvccpb.KeyValue, err error)
	Delete(key string, timeout time.Duration, opts ...clientv3.OpOption) (resp *clientv3.DeleteResponse, err error)
	Connection() (client *clientv3.Client)
	Close() (err error)
}

type Deserialize func(data []byte) (value interface{}, err error)

type Service interface {
	//注册服务
	Register(serviceTarget string, value string)
	//获取所有服务列表
	Get(serviceTarget string) (list map[string]interface{}, exists bool)
	//随机取一个服务
	RandOne(key string) (value interface{}, exists bool)
	//遍历服务，handler返回true时停止遍历
	Range(key string, handler func(index string, val interface{}) (handled bool))
	Close() (err error)
}