code: def setup_exchange(self, exchange_name):
          
          _logger.debug('Declaring exchange %s', exchange_name)
          self._channel.exchange_declare(self.on_exchange_declareok,
                                         exchange_name,
                                         self.EXCHANGE_TYPE,
                                         durable=True,
                                         passive=True)
docs: Setup the exchange on RabbitMQ by invoking the Exchange.Declare RPC
          command. When it is complete, the on_exchange_declareok method will
          be invoked by pika.
  
          :param str|unicode exchange_name: The name of the exchange to declare