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

Question

如果我运行以下代码，回调（测试）将传递到 消费者永远不会被触发。

但是，如果我密切关注rabbitmq GUI，我确实会看到消息已被检索（但未确认）。所以看起来消费者正在收到消息，但没有将其传递给我的回调。如果我将 no_ack 设置为 true，消息就会从队列中消失，同样不会调用回调。

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，以下代码确实可以正常工作（我可以成功获取并确认该消息）：

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

事实证明这是一个简单的错误。添加

connection.drain_events()

到 while 循环会导致消息到达。