docs: def rooms(sid=None, namespace=None):
      """Return a list of the rooms the client is in.
  
      This function returns all the rooms the client has entered, including its
      own room, assigned by the Socket.IO server.
  
      :param sid: The session id of the client. If not provided, the client is
                  obtained from the request context.
      :param namespace: The namespace for the room. If not provided, the
                        namespace is obtained from the request context.
      """
      socketio = flask.current_app.extensions['socketio']
      sid = sid or flask.request.sid
      namespace = namespace or flask.request.namespace
      return socketio.server.rooms(sid, namespace=namespace)