async def stop(self, _signal):
        """
        Finish all running tasks, cancel remaining tasks, then stop loop.
        :param _signal:
        :return:
        """
        self.logger.info(f'Stopping spider: {self.name}')
        await self._cancel_tasks()
        self.loop.stop()
Finish all running tasks, cancel remaining tasks, then stop loop.
        :param _signal:
        :return: