def on_cancelok(self, _):
logger.debug('<STR_LIT>')<EOL>self.close_channel()<EOL>
Called by pika when RabbitMQ acknowledges the cancellation of a
        consumer.

        At this point we will close the channel. This will invoke the
        on_channel_closed method once the channel has been closed, which
        will in-turn close the connection.

        :param pika.frame.Method _: The Basic.CancelOk frame