add Conn.UserData and Conn.SessionID

connection.go

@@ -44,6 +44,8 @@ type Conn struct {
 	dec              Decoder
 	decBuf           bytes.Buffer
 	raddr            string
+
+	UserData interface{} // User data
 }
 
 // NewConn creates a new connection for the sio. It generates the session id and
@@ -75,6 +77,11 @@ func (c *Conn) String() string {
 	return fmt.Sprintf("%v[%v]", c.sessionid, c.socket)
 }
 
+// SessionID return the session id of Conn
+func (c *Conn) SessionID() SessionID {
+	return c.sessionid
+}
+
 // RemoteAddr returns the remote network address of the connection in IP:port format
 func (c *Conn) RemoteAddr() string {
 	return c.raddr