CELERY_ALWAYS_EAGER 好像没有效果

Question

我有一个 Django + Celery 设置，可以在使用 RabbitMQ 的生产中正常工作。

AFAIK，在本地 django 设置中设置CELERY_ALWAYS_EAGER为应该就足够了True，以避免设置 RabbitMQ 进行开发。我已经这样做了，但是在任务上调用 .delay() 时，我得到：

Traceback (most recent call last):
  File "lib/python2.7/site-packages/django/core/handlers/base.py", line 132, in get_response
    response = wrapped_callback(request, *callback_args, **callback_kwargs)
  File "lib/python2.7/site-packages/django/views/generic/base.py", line 71, in view
    return self.dispatch(request, *args, **kwargs)
  File "lib/python2.7/site-packages/django/views/generic/base.py", line 89, in dispatch
    return handler(request, *args, **kwargs)
  File "lib/python2.7/site-packages/django/views/generic/edit.py", line 215, in post
    return self.form_valid(form)
  File "app/web/views.py", line 188, in form_valid
    form.send_email()
  File "app/web/forms.py", line 17, in send_email
    send_email.delay(mail, recipients, 'Contact %s' % name, comment)
  File "lib/python2.7/site-packages/celery/app/task.py", line 453, in delay
    return self.apply_async(args, kwargs)
  File "lib/python2.7/site-packages/celery/app/task.py", line 559, in apply_async
    **dict(self._get_exec_options(), **options)
  File "lib/python2.7/site-packages/celery/app/base.py", line 353, in send_task
    reply_to=reply_to or self.oid, **options
  File "lib/python2.7/site-packages/celery/app/amqp.py", line 305, in publish_task
    **kwargs
  File "lib/python2.7/site-packages/kombu/messaging.py", line 172, in publish
    routing_key, mandatory, immediate, exchange, declare)
  File "lib/python2.7/site-packages/kombu/connection.py", line 457, in _ensured
    interval_max)
  File "lib/python2.7/site-packages/kombu/connection.py", line 369, in ensure_connection
    interval_start, interval_step, interval_max, callback)
  File "lib/python2.7/site-packages/kombu/utils/__init__.py", line 243, in retry_over_time
    return fun(*args, **kwargs)
  File "lib/python2.7/site-packages/kombu/connection.py", line 237, in connect
    return self.connection
  File "lib/python2.7/site-packages/kombu/connection.py", line 741, in connection
    self._connection = self._establish_connection()
  File "lib/python2.7/site-packages/kombu/connection.py", line 696, in _establish_connection
    conn = self.transport.establish_connection()
  File "lib/python2.7/site-packages/kombu/transport/librabbitmq.py", line 123, in establish_connection
    conn = self.Connection(**opts)
  File "lib/python2.7/site-packages/librabbitmq/__init__.py", line 199, in __init__
    self.connect()
ConnectionError: Error opening socket: a socket error occurred

Answer 1

作为记录，自celery 4.0以来，此设置已重命名为task_always_eager：

# setting renamed on celery 4.0
CELERY_ALWAYS_EAGER --> task_always_eager

为了帮助迁移到此版本，Celery 提供了以下实用程序来自动更新您的设置：

# --django allows to keep uppercase settings and CELERY_ prefix
$ celery upgrade settings proj/settings.py --django

Answer 2

所以我发现了问题所在。基本上我失踪了：

from .celery import app as celery_app

在proj/proj/__init__.py

由于某些神秘的原因，这似乎仅在运行时失败runserver，而不是wsgi.py通过运行时失败uWSGI。不知道为什么，但通过导入它runserver也可以工作。