pika rabbitmq python 3.6

Question

我正在尝试使用 pika 连接rabbitmq

def get_connection():
    credentials = pika.PlainCredentials(MQ_USER, MQ_PASS)
    connection = pika.BlockingConnection(pika.ConnectionParameters(MQ_SERVER, 5672, '/', credentials))
    return connection

我可以将这些凭据与 rabbitmqctl 一起使用，输出如下所示：

# rabbitmqctl authenticate_user user pass
Authenticating user "user" ...
Success

我还尝试仅使用带有函数内部值的字符串并得到相同的错误。 我还可以在 rabbitmq 端口上进行 telnet 访问，并且用户可以访问该频道。

执行python代码时出现此错误：

Internal Server Error: /api/analysis/stream/finish/
Traceback (most recent call last):
  File "/path/to/api/venv/lib/python3.6/site-packages/django/core/handlers/exception.py", line 34, in inner
    response = get_response(request)
  File "/path/to/api/venv/lib/python3.6/site-packages/django/core/handlers/base.py", line 115, in _get_response
    response = self.process_exception_by_middleware(e, request)
  File "/path/to/api/venv/lib/python3.6/site-packages/django/core/handlers/base.py", line 113, in _get_response
    response = wrapped_callback(request, *callback_args, **callback_kwargs)
  File "/path/to/api/core/views.py", line 2465, in record_finsh
    inform_process(video.filename)
  File "/path/to/api/core/views.py", line 702, in inform_process
    con = get_connection()
  File "/path/to/api/base/rabitmq.py", line 7, in get_connection
    connection = pika.BlockingConnection(pika.ConnectionParameters(host=MQ_SERVER, port=5672, virtual_host='/', credentials=credentials))
  File "/path/to/api/venv/lib/python3.6/site-packages/pika/adapters/blocking_connection.py", line 360, in __init__
    self._impl = self._create_connection(parameters, _impl_class)
  File "/path/to/api/venv/lib/python3.6/site-packages/pika/adapters/blocking_connection.py", line 451, in _create_connection
    raise self._reap_last_connection_workflow_error(error)
pika.exceptions.AMQPConnectionError

在我credentials = pika.PlainCredentials(MQ_USER, MQ_PASS)即使在下一行出现错误时，这行credentials = pika.PlainCredentials(MQ_USER, MQ_PASS)发生一些事情credentials = pika.PlainCredentials(MQ_USER, MQ_PASS) 。 这个函数具体是做什么的？ 关于我做错了什么的任何想法？

编辑：我说我认为错误是在这行credentials = pika.PlainCredentials(MQ_USER, MQ_PASS)因为如果我添加如下内容：

def get_connection():
    credentials = pika.PlainCredentials(MQ_USER, MQ_PASS)
    exit()
    connection = pika.BlockingConnection(pika.ConnectionParameters(MQ_SERVER, 5672, '/', credentials))
    return connection

我仍然或多或少地遇到相同的错误：

Internal Server Error: /api/analysis/stream/finish/
Traceback (most recent call last):
  File "/path/to/api/venv/lib/python3.6/site-packages/django/core/handlers/exception.py", line 34, in inner
    response = get_response(request)
  File "/path/to/api/venv/lib/python3.6/site-packages/django/core/handlers/base.py", line 115, in _get_response
    response = self.process_exception_by_middleware(e, request)
  File "/path/to/api/venv/lib/python3.6/site-packages/django/core/handlers/base.py", line 113, in _get_response
    response = wrapped_callback(request, *callback_args, **callback_kwargs)
  File "/path/to/api/core/views.py", line 2465, in record_finsh
    inform_process(video.filename)
  File "/path/to/api/core/views.py", line 702, in inform_process
    con = get_connection()
  File "/path/to/api/base/rabitmq.py", line 7, in get_connection
    return 0
  File "/path/to/api/venv/lib/python3.6/site-packages/pika/adapters/blocking_connection.py", line 360, in __init__
    self._impl = self._create_connection(parameters, _impl_class)
  File "/path/to/api/venv/lib/python3.6/site-packages/pika/adapters/blocking_connection.py", line 451, in _create_connection
    raise self._reap_last_connection_workflow_error(error)
pika.exceptions.AMQPConnectionError

因此，我还尝试用实际值替换，如credentials = pika.PlainCredentials('user', 'mq@pass')并得到相同的结果。

EDIT2：回答下面的评论。

def get_connection():
    credentials = pika.PlainCredentials('user', 'mq@passwd')
    connection = pika.BlockingConnection(pika.ConnectionParameters('172.x.y.z', 5672, '/', credentials))
    return connection

返回相同的问题。 Rabbit MQ 在远程 IP 上运行。 我已经测试过了，我可以 telnet 到 IP。

Answer 1

当 pika 无法访问host时，会引发pika.exceptions.AMQPConnectionError 。

如果凭据无效，pika 会引发：

pika.exceptions.ConnectionClosedByBroker: (403, 'ACCESS_REFUSED - Login was refused using authentication mechanism PLAIN. For details see the broker logfile.')

对于无效的虚拟主机：

pika.exceptions.ConnectionClosedByBroker: (530, 'NOT_ALLOWED - vhost / not found')

检查提供的host或port值是否有效。

参考： pika 文档