add ftcp listener

server/listener/udp/listener.go

@@ -72,7 +72,12 @@ func (l *Listener) Accept() (conn net.Conn, err error) {
 }
 
 func (l *Listener) Close() error {
-	return l.conn.Close()
+	err := l.conn.Close()
+	l.connPool.Range(func(k interface{}, v *serverConn) bool {
+		v.Close()
+		return true
+	})
+	return err
 }
 
 func (l *Listener) Addr() net.Addr {