鼠兔，停止消费不起作用

2022-01-11 00:00:00 python rabbitmq pika

问题描述

我是 rabbitmq 和 pika 的新手，并且无法停止消费.

I'm new to rabbitmq and pika, and is having trouble with stopping consuming.

频道和队列设置:

connection = pika.BlockingConnection(pika.ConnectionParameters('localhost'))
channel = connection.channel()
channel.queue_declare(queue=new_task_id, durable=True, auto_delete=True)

消费者和生产者基本上是这样的:

Basically, consumer and producer are like this:

消费者:

def task(task_id):
    def callback(channel, method, properties, body):
        if body != "quit":
            print(body)
        else:
            print(body)
            channel.stop_consuming(task_id)

    channel.basic_consume(callback, queue=task_id, no_ack=True)
    channel.start_consuming()
    print("finish")
    return "finish"

制作人:

proc = Popen(['app/sample.sh'], shell=True, stdout=PIPE)
while proc.returncode is None:  # running
    line = proc.stdout.readline()
    if line:
        channel.basic_publish(
            exchange='',
            routing_key=self.request.id,
            body=line
        )
    else:
        channel.basic_publish(
            exchange='',
            routing_key=self.request.id,
            body="quit"
        )
        break

consumer task 给了我输出:

consumer task gave me output:

# ... output from sample.sh, as expected

quit
�}q(UstatusqUSUCCESSqU  tracebackqNUresultqNUtask_idqU
1419350416qUchildrenq]u.

但是，"finish" 没有被打印出来，所以我猜这是因为 channel.stop_sumption(task_id) 没有停止消费.如果是这样，正确的做法是什么?谢谢.

However, "finish" didn't get printed, so I'm guessing it's because channel.stop_consuming(task_id) didn't stop consuming. If so, what is the correct way to do? Thank you.

解决方案

我也遇到了同样的问题.这似乎是由于在内部，start_sumption 调用 self.connection.process_data_events(time_limit=None) 造成的.这个 time_limit=None 使它挂起.

I had the same problem. It seems to be caused by the fact that internally, start_consuming calls self.connection.process_data_events(time_limit=None). This time_limit=None makes it hang.

我设法通过将 channel.start_sumption() 的调用替换为它的实现来解决这个问题，被黑了:

I managed to workaround this problem by replacing the call to channel.start_consuming() with its implemenation, hacked:

while channel._consumer_infos:
    channel.connection.process_data_events(time_limit=1) # 1 second

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