148 lines
5.1 KiB
Python
148 lines
5.1 KiB
Python
import asyncio
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import inspect
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import warnings
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from asgiref.sync import sync_to_async
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class RemovedInDjango40Warning(DeprecationWarning):
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pass
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class RemovedInDjango41Warning(PendingDeprecationWarning):
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pass
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RemovedInNextVersionWarning = RemovedInDjango40Warning
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class warn_about_renamed_method:
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def __init__(self, class_name, old_method_name, new_method_name, deprecation_warning):
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self.class_name = class_name
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self.old_method_name = old_method_name
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self.new_method_name = new_method_name
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self.deprecation_warning = deprecation_warning
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def __call__(self, f):
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def wrapped(*args, **kwargs):
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warnings.warn(
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"`%s.%s` is deprecated, use `%s` instead." %
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(self.class_name, self.old_method_name, self.new_method_name),
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self.deprecation_warning, 2)
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return f(*args, **kwargs)
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return wrapped
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class RenameMethodsBase(type):
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"""
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Handles the deprecation paths when renaming a method.
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It does the following:
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1) Define the new method if missing and complain about it.
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2) Define the old method if missing.
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3) Complain whenever an old method is called.
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See #15363 for more details.
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"""
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renamed_methods = ()
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def __new__(cls, name, bases, attrs):
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new_class = super().__new__(cls, name, bases, attrs)
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for base in inspect.getmro(new_class):
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class_name = base.__name__
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for renamed_method in cls.renamed_methods:
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old_method_name = renamed_method[0]
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old_method = base.__dict__.get(old_method_name)
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new_method_name = renamed_method[1]
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new_method = base.__dict__.get(new_method_name)
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deprecation_warning = renamed_method[2]
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wrapper = warn_about_renamed_method(class_name, *renamed_method)
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# Define the new method if missing and complain about it
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if not new_method and old_method:
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warnings.warn(
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"`%s.%s` method should be renamed `%s`." %
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(class_name, old_method_name, new_method_name),
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deprecation_warning, 2)
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setattr(base, new_method_name, old_method)
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setattr(base, old_method_name, wrapper(old_method))
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# Define the old method as a wrapped call to the new method.
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if not old_method and new_method:
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setattr(base, old_method_name, wrapper(new_method))
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return new_class
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class DeprecationInstanceCheck(type):
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def __instancecheck__(self, instance):
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warnings.warn(
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"`%s` is deprecated, use `%s` instead." % (self.__name__, self.alternative),
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self.deprecation_warning, 2
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)
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return super().__instancecheck__(instance)
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class MiddlewareMixin:
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sync_capable = True
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async_capable = True
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# RemovedInDjango40Warning: when the deprecation ends, replace with:
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# def __init__(self, get_response):
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def __init__(self, get_response=None):
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self._get_response_none_deprecation(get_response)
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self.get_response = get_response
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self._async_check()
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super().__init__()
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def _async_check(self):
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"""
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If get_response is a coroutine function, turns us into async mode so
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a thread is not consumed during a whole request.
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"""
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if asyncio.iscoroutinefunction(self.get_response):
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# Mark the class as async-capable, but do the actual switch
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# inside __call__ to avoid swapping out dunder methods
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self._is_coroutine = asyncio.coroutines._is_coroutine
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def __call__(self, request):
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# Exit out to async mode, if needed
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if asyncio.iscoroutinefunction(self.get_response):
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return self.__acall__(request)
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response = None
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if hasattr(self, 'process_request'):
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response = self.process_request(request)
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response = response or self.get_response(request)
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if hasattr(self, 'process_response'):
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response = self.process_response(request, response)
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return response
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async def __acall__(self, request):
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"""
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Async version of __call__ that is swapped in when an async request
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is running.
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"""
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response = None
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if hasattr(self, 'process_request'):
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response = await sync_to_async(
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self.process_request,
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thread_sensitive=True,
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)(request)
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response = response or await self.get_response(request)
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if hasattr(self, 'process_response'):
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response = await sync_to_async(
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self.process_response,
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thread_sensitive=True,
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)(request, response)
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return response
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def _get_response_none_deprecation(self, get_response):
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if get_response is None:
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warnings.warn(
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'Passing None for the middleware get_response argument is '
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'deprecated.',
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RemovedInDjango40Warning, stacklevel=3,
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)
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