发布大型邮件时出现Pika basic_publish错误

Question

Pika发布消息成功，其大小小于10k字节，并且当大小大于10k字节时失败。

错误信息如下：

Error. Connection closed, and the message was never delivered.
Traceback (most recent call last):
  File "test_mq.py", line 28, in <module>
    ret = test_mq.publish(test_str)
  File "rbmq.py", line 146, in publish
    ret = self._channel.basic_publish(exchange=self.exc, routing_key=self.rkey, body=body, properties=pika.BasicProperties(delivery_mode=2, ))
  File "build/bdist.linux-x86_64/egg/pika/adapters/blocking_connection.py", line 521, in basic_publish
  File "build/bdist.linux-x86_64/egg/pika/adapters/blocking_connection.py", line 1106, in _rpc
  File "build/bdist.linux-x86_64/egg/pika/adapters/blocking_connection.py", line 218, in process_data_events
pika.exceptions.ConnectionClosed

代码如下：

    def publish(self, body):
        ret = False
        try:
            ret = self._channel.basic_publish(exchange=self.exc, routing_key=self.rkey, body=body, properties=pika.BasicProperties(delivery_mode=2, ))
        except pika.exceptions.ConnectionClosed as exc:
            print('Error. Connection closed, and the message was never delivered.')
            self._reconnect()
            ret = self._channel.basic_publish(exchange=self.exc, routing_key=self.rkey, body=body, properties=pika.BasicProperties(delivery_mode=2, ))
            print("Try again ret: ", ret)
        except Exception as e:
            print ("PikaMQ publish really error ", e)            
        return ret

test_str_fail = 49143 * 'a' 
test_str_ok = 9143 * 'a'
ret = test_mq.publish(test_str_ok)   #publish success
ret = test_mq.publish(test_str_fail) #publish fail

Answer 1

我建议你升级到pika 0.9.14。最新版本修复了几个非常重要的套接字错误;包括导致你的问题的那个。

您可以使用pip升级到0.9.14：

pip install pika --upgrade

这取自尚未完成的changelog for 0.9.14。

Major issue with socket buffer refactor in 0.9.13 (#328) fixes by cooper6581 and Erik Andersson

作为替代方案，如果由于某种原因你无法从0.9.13升级到0.9.14，你可以试用一些替代的RabbitMQ客户端用于Python。

• AMQP-Storm - Examples - pip install amqp-storm
• Rabbitpy - Examples - pip install rabbitpy
• Py-AMQP - pip install amqp
• Librabbitmq - pip install librabbitmq
• txAMQP - pip install txamqp

- 在兔子官方网站here上可以获得更全面的鼠兔替代品清单。