Python Kombu消费者未通知rabbitmq消息(queue.get确实有效)

Question

如果我运行以下代码,则永远不会触发传递给使用者的回调(测试).

但是,如果我密切关注rabbitmq GUI,我确实会看到该消息被检索(但未被确认).所以看起来消费者正在收到消息,但不会将消息传递给我的回调.如果我将no_ack设置为true,则消息将从队列中消失,同样不再调用回调.

hn = "..."
usr = "..."
pwd = "..."
vh = "/"
port = 5672
rkey = "some.routing.key"
qname = "some-queue-name"
exchangeName = "MyExchange"

connection = BrokerConnection(hostname=hn,
                              userid=usr,
                              password=pwd,
                              virtual_host=vh,
                              port=port)

connection.connect()
ch = connection.channel()

# Create & the exchange
exchange = Exchange(name=exchangeName,
              type="topic",
              channel=ch,
              durable=True)

exchange.declare()

# Temporary channel
ch = connection.channel()

# Create the queue to feed from
balq = Queue(name=qname,
              exchange=exchange,
              durable=True,
              auto_delete=False,
              channel=ch,
              routing_key=rkey)        

# Declare it on the server
balq.declare();

def test(b,m):
    print '** Message Arrived **'

# Create a consumer
consumer = Consumer(channel=connection.channel(),
                    queues=balq,
                    auto_declare=False,
                    callbacks = [test]
                    )

# register it on the server
consumer.consume(no_ack=False);

print 'Waiting for messages'
while(True):
    pass

但是,以下代码可以正常工作(我可以成功获取并确认消息):

m = balq.get(no_ack=False)
m.ack()
print m

但重点是保持异步.所以我的回调一定有问题.

Answer 1

原来是一个简单的错误.添加

connection.drain_events()

到while循环导致消息到达.