[英]Python Kombu consumer not notified of rabbitmq message (queue.get does work)
If I run the following code, the callback (test) passed to the consumer is never triggered. 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)。
However, if I keep an eye on the rabbitmq GUI, I do see that the message is retrieved (but not acknowledged). 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)。 So it seems the consumer is getting the message, but not passing it on to my callback.
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。 If I set no_ack to true, the message just disappears from the queue, again without calling the callback.
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
However, the following code does work properly (I can successfully get and acknowledge the message): 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
But the whole point was to stay asynchronous. 但重点是保持异步。 So something must be wrong with my callback..
所以我的回调一定有问题。
Turns out its a simple error. 原来是一个简单的错误。 Adding
添加
connection.drain_events()
to the while loop causes messages to arrive. 到while循环导致消息到达。
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