Called when a client closes a websocket connection

def onClose(self, was_clean, code, reason):
        """
        Called when a client closes a websocket connection
        """
        logger.debug("Connection closed ({peer})".format(peer=self.peer))

        # Publish ON_CLOSE message
        self.factory.mease.publisher.publish(
            message_type=ON_CLOSE, client_id=self._client_id, client_storage=self.storage)

        self.factory.remove_client(self)