refactor: message entity

protocol/bt/peer/message/msg_unchoke.go

@@ -2,23 +2,13 @@ package message
 
 // 	unchoke: <len=0001><id=1>
 type Unchoke struct {
-	Message
+	*base
 }
 
 func NewUnchoke() *Unchoke {
 	return &Unchoke{
-		Message{
-			Length: 1,
-			ID:     IdUnchoke,
+		base: &base{
+			id: IdUnchoke,
 		},
 	}
 }
-
-func (u *Unchoke) Encode() []byte {
-	return u.Message.Encode()
-}
-
-func (u *Unchoke) Decode(buf []byte) Serialize {
-	u.Message.Decode(buf)
-	return u
-}