多消费者中的Rabbitmq应答

我有一个队列，其中多个消费者以循环方式工作

Delivery_标记用于在消费者完成处理后确认消息。但是多个消费者设置了相同的

交付标签

，尽管他们处理的消息不同

因此，当确认完成时，我得到的是

前置条件失败

谁能告诉我哪里做错了

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这是消费者代码。我从这个链接得到：

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这是消费代码。我从这个链接上得到的

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你能为消费者发布你的代码吗？仅供参考，你得到的消费者代码是Python而不是Groovy。给定的消费者代码中没有ack。

from amqplib import client_0_8 as amqp

conn = amqp.Connection(host="localhost:5672", userid="guest", password="guest", virtual_host="/", insist=False)
chan = conn.channel()

chan.queue_declare(queue="po_box", durable=True, exclusive=False, auto_delete=False)
chan.exchange_declare(exchange="sorting_room", type="direct", durable=True, auto_delete=False,)

chan.queue_bind(queue="po_box", exchange="sorting_room", routing_key="jason")

def recv_callback(msg):
    print 'Received: ' + msg.body + ' from channel #' + str(msg.channel.channel_id)

chan.basic_consume(queue='po_box', no_ack=True, callback=recv_callback, consumer_tag="testtag")
while True:
    chan.wait()
chan.basic_cancel("testtag")


chan.close()
conn.close()

from amqplib import client_0_8 as amqp

conn = amqp.Connection(host="localhost:5672", userid="guest", password="guest", virtual_host="/", insist=False)
chan = conn.channel()

chan.queue_declare(queue="po_box", durable=True, exclusive=False, auto_delete=False)
chan.exchange_declare(exchange="sorting_room", type="direct", durable=True, auto_delete=False,)

chan.queue_bind(queue="po_box", exchange="sorting_room", routing_key="jason")

def recv_callback(msg):
    print 'Received: ' + msg.body + ' from channel #' + str(msg.channel.channel_id)

chan.basic_consume(queue='po_box', no_ack=True, callback=recv_callback, consumer_tag="testtag")
while True:
    chan.wait()
chan.basic_cancel("testtag")


chan.close()
conn.close()