intermittent No module named context_processors when using nginx/uwsgi

[Robert Paprocki]

Given that the stack trace is from Python, it’s not an nginx configuration issue. Are you reverse proxying from nginx multiple uwsgi backgrounds that have different configuration?

Sent from my iPhone

> On Jan 5, 2019, at 13:01, Larry Martell <larry.martell at gmail.com> wrote:
> 
> I am having an odd interment django problem. I have an app which is
> deployed at 30 different sites, some with apache and wsgi and some
> with nginx and uwsgi. At only the nginx/uwsgi sites and only
> intermittently, users will get the error No module named
> context_processors.
> 
> I am only posting it here because the issue only occurs when using
> nginx/uwsgi and never with apache/wsgi. I have posted this to both the
> Django group and stackoverflow, but had not received any help.
> 
> It may happen on a page that was previously accessed with no error and
> upon refreshing the same page it will come up fine. It will not occur
> for months, then happen a few times in one day.
> 
> Here is a typical traceback:
> 
> Internal Server Error: /
> Traceback (most recent call last):
>  File "/usr/local/lib/python3.5/dist-packages/django/core/handlers/exception.py",
> line 35, in inner
>    response = get_response(request)
>  File "/usr/local/lib/python3.5/dist-packages/django/core/handlers/base.py",
> line 158, in _get_response
>    response = self.process_exception_by_middleware(e, request)
>  File "/usr/local/lib/python3.5/dist-packages/django/core/handlers/base.py",
> line 156, in _get_response
>    response = response.render()
>  File "/usr/local/lib/python3.5/dist-packages/django/template/response.py",
> line 106, in render
>    self.content = self.rendered_content
>  File "/usr/local/lib/python3.5/dist-packages/django/template/response.py",
> line 83, in rendered_content
>    content = template.render(context, self._request)
>  File "/usr/local/lib/python3.5/dist-packages/django/template/backends/django.py",
> line 61, in render
>    return self.template.render(context)
>  File "/usr/local/lib/python3.5/dist-packages/django/template/base.py",
> line 173, in render
>    with context.bind_template(self):
>  File "/usr/lib/python3.5/contextlib.py", line 59, in __enter__
>    return next(self.gen)
>  File "/usr/local/lib/python3.5/dist-packages/django/template/context.py",
> line 246, in bind_template
>    processors = (template.engine.template_context_processors +
>  File "/usr/local/lib/python3.5/dist-packages/django/utils/functional.py",
> line 36, in __get__
>    res = instance.__dict__[self.name] = self.func(instance)
>  File "/usr/local/lib/python3.5/dist-packages/django/template/engine.py",
> line 85, in template_context_processors
>    return tuple(import_string(path) for path in context_processors)
>  File "/usr/local/lib/python3.5/dist-packages/django/template/engine.py",
> line 85, in <genexpr>
>    return tuple(import_string(path) for path in context_processors)
>  File "/usr/local/lib/python3.5/dist-packages/django/utils/module_loading.py",
> line 17, in import_string
>    module = import_module(module_path)
>  File "/usr/lib/python3.5/importlib/__init__.py", line 126, in import_module
>    return _bootstrap._gcd_import(name[level:], package, level)
>  File "<frozen importlib._bootstrap>", line 986, in _gcd_import
>  File "<frozen importlib._bootstrap>", line 969, in _find_and_load
>  File "<frozen importlib._bootstrap>", line 956, in _find_and_load_unlocked
> ImportError: No module named 'ui.context_processors'
> 
> That file does exist and is readable:
> 
> -rw-rw-r-- 1 ubuntu ubuntu 1059 May  2  2018 ui/context_processors.py
> 
> And here is my TEMPLATES setting:
> 
> TEMPLATES = [
>    {
>        'BACKEND': 'django.template.backends.django.DjangoTemplates',
>        'DIRS': [
>            os.path.join(BASE_DIR, 'ui/templates'),
>            os.path.join(BASE_DIR, 'app/dse/templates'),
>            os.path.join(BASE_DIR, 'core/reports/templates'),
>        ],
>        'APP_DIRS': True,
>        'OPTIONS': {
>            'context_processors': [
>                'django.template.context_processors.debug',
>                'django.template.context_processors.request',
>                'django.contrib.auth.context_processors.auth',
>                'django.contrib.messages.context_processors.messages',
>                'context_processors.config',
>                'ui.context_processors.navigation',
>                'core.appmngr.context_processor',
>            ],
>        },
>    },
> ]
> 
> As I said it's intermittent. Anyone have any ideas on what it could be
> and/or how to debug it?
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