[go-nuts] server msgpack practise

Hi list:

I'm now building a tcp server, use https://github.com/ugorji/go to
serilize/deserialize all messages between clients and server, I have some
question on converting the decoded "interface" to correct types.

here's the example:

// client will send following 2 kinds of message to server
type HeartbeatMsg struct {
     Msgid int
     Seq int
}

type LoginMsg struct {
     Msgid int
     Username string
     Password string
}

// handle hearbeat msg
func handlHeartbeat(msg *HeartbeatMsg , conn net.Conn) {

}

// handle login msg
func handleLogin(msg *LoginMsg,conn net.Conn) {

}

func handleMsg(conn net.Conn) {
     var MsgpackHandle codec.MsgpackHandle
     // create a decoder for conn
     d := codec.NewDecoder(conn, &golib.MsgpackHandle)

     for {
         // use interface because we don't know what exactely client send to
us
         var imsg interface{}
         err := d.Decode(&msg)

         // what can I do here to convert imsg to HeartbeatMsg or LoginMsg?
      }
}



Currently, I know there is Msgid of int at the begining of client message,
I can access imsg with reflect to get that value, then make a deep copy of
imsg to destination.
But there are cases that client messages don't share a COMMON HEADER, there
should be a clean way to archive this.