django - ImproperlyConfigured middleware in Django project(导入redis功能报错)

Question

我正在为我的 Django 应用程序编写一个中间件，我从 request.session 获取一个变量，然后必须将它插入到 redis 排序集中。相当直接。

即

import os
#os.environ.setdefault("DJANGO_SETTINGS_MODULE","myproject.settings")
from myapp.redis_functions import set_whose_online

class WhoseOnlineMiddleware(object):
    def process_request(self, request):
        if '_auth_user_id' in request.session:
            set_whose_online(request.session['_auth_user_id'])
        else:
            pass

redis_functions.py 包含我的应用程序中所有与 redis 相关的函数。 Redis 连接池也在那里实例化。

但这在 import 时给我一个 ImporperlyConfigured 错误。完整的回溯是:

Traceback (most recent call last):
  File "/usr/lib/python2.7/wsgiref/handlers.py", line 85, in run
    self.result = application(self.environ, self.start_response)
  File "/home/myuser/.virtualenvs/myenv/local/lib/python2.7/site-packages/django/contrib/staticfiles/handlers.py", line 72, in __call__
    return self.application(environ, start_response)
  File "/home/myuser/.virtualenvs/myenv/local/lib/python2.7/site-packages/dj_static.py", line 83, in __call__
    return self.application(environ, start_response)
  File "/home/myuser/.virtualenvs/myenv/local/lib/python2.7/site-packages/django/core/handlers/wsgi.py", line 236, in __call__
    self.load_middleware()
  File "/home/myuser/.virtualenvs/myenv/local/lib/python2.7/site-packages/django/core/handlers/base.py", line 53, in load_middleware
    raise exceptions.ImproperlyConfigured('Error importing middleware %s: "%s"' % (mw_module, e))
ImproperlyConfigured: Error importing middleware myproject.middleware.WhoseOnline: "cannot import name add_filtered_post"

这很令人费解，因为我不是要导入 add_filtered_post，而是要导入 set_whose_online。 add_filtered_post 是 redis_functions.py 中的另一个函数，完全用于其他地方。

可能发生了什么，我该如何解决这个问题？我猜循环导入是罪魁祸首，但 python manage.py validate --traceback 返回 0 个错误。

---

这是我的 settings.py 中的内容:

MIDDLEWARE_CLASSES = (
    'myproject.middleware.XForwardedFor.XForwardedForMiddleware',
    'user_sessions.middleware.SessionMiddleware',
    'django.middleware.common.CommonMiddleware',
    'django.middleware.csrf.CsrfViewMiddleware',
    'django.contrib.auth.middleware.AuthenticationMiddleware',
    'myproject.middleware.WhoseOnline.WhoseOnlineMiddleware',
    #'django.contrib.auth.middleware.SessionAuthenticationMiddleware',
    'myproject.middleware.HellBanned.HellBannedMiddleware',
    'django.contrib.messages.middleware.MessageMiddleware',
    'mobileesp.middleware.MobileDetectionMiddleware',
    # Uncomment the next line for simple clickjacking protection:
    'django.middleware.clickjacking.XFrameOptionsMiddleware',
)

注意:中间件添加到 myfolder/myproject/middleware/WhoseOnline.py，即与 settings.py、urls、templates 相同的文件夹

Answer 1

虽然发生这种情况可能有多种原因，但在我的特殊情况下，这是因为循环导入。我诊断并解决了问题，然后就消失了。