refactor: message entity

protocol/bt/peer/message/msg_choke.go

@@ -2,23 +2,13 @@ package message
 
 // choke: <len=0001><id=0>
 type Choke struct {
-	Message
+	*base
 }
 
 func NewChoke() *Choke {
 	return &Choke{
-		Message{
-			Length: 1,
-			ID:     IdChoke,
+		base: &base{
+			id: IdChoke,
 		},
 	}
 }
-
-func (c *Choke) Encode() []byte {
-	return c.Message.Encode()
-}
-
-func (c *Choke) Decode(buf []byte) Serialize {
-	c.Message.Decode(buf)
-	return c
-}