带有 python 鼠兔库的 Rabbit MQ StreamLostError

Question

When I listen my queue with python pika library, I always get StreamLostError and my code crushes.

In my code, I must listen the queue forever without exception and I must get messages 1 by 1.

Here is my code(I simplified it).

def callback(ch, method, properties, body):
   ch.basic_ack(delivery_tag = method.delivery_tag)
   #doing work here, it gets minimum 5 minutes, sometimes maximum 1 hour

credentials = pika.PlainCredentials(username, password)
parameters = pika.ConnectionParameters(ip, port, '/', credentials)
connection = pika.BlockingConnection(parameters)
channel = connection.channel()
channel.basic_qos(prefetch_count=1)
channel.queue_declare(queue=queuename, durable=True)
channel.basic_consume(queue=queuename, on_message_callback=callback, auto_ack=False)
channel.start_consuming()  

Answer 1

try to set connection_attempts and retry_delay parameters in the request if you are using pika URLParameters. Look down the below link for more information.In my case I added ?connection_attempts=20&retry_delay=1 after the AMPQ https://pika.readthedocs.io/en/stable/modules/parameters.html#urlparameters

Answer 2

The problem is that your work takes too long and blocks Pika's I/O loop. This causes heartbeats to be missed, and RabbitMQ thinks your connection is dead.

Please see this code for one correct way to do long-running work:

https://github.com/pika/pika/blob/master/examples/basic_consumer_threaded.py

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