def declare(self, exchange, exchange_type, binding="", queue=""):
"""declares the exchange, the queue and binds the queue to the exchange
exchange - exchange name
exchange_type - direct, topic, fanout
binding - binding to queue (optional)
queue - queue to bind to exchange using binding (optional)
"""
if (binding and not queue) or (queue and not binding):
if queue and not exchange_type == "fanout":
raise Error("binding and queue are not mutually exclusive")
consumer = Consumer(connection=self.broker,
exchange=exchange, exchange_type=exchange_type,
routing_key=binding, queue=queue)
consumer.declare()
consumer.close()
