prompt: We are currently solving the following issue within our repository. Here is the issue text:
  --- BEGIN ISSUE ---
  DjangoIntegration conflict with MiddlewareMixin & TemplateView
  django version: 3.0
  sentry-sdk version: 0.14.3
  
  My project has a middleware using Django's `django.utils.deprecation.MiddlewareMixin`. Visiting a view which subclasses `django.views.generic.TemplateView` while Sentry is active results in the following exception:
  ```
  AttributeError: 'function' object has no attribute '__self__'
    File "django/core/handlers/exception.py", line 47, in inner
      response = get_response(request)
    File "django/core/handlers/base.py", line 196, in _get_response
      middleware_method.__self__.__class__.__name__,
  ```
  
  The following classes & url config should be sufficient to demonstrate the problem:
  
  ```
  from django.utils.deprecation import MiddlewareMixin
  from django.views.generic import TemplateView
  
  # ...in myapp.middleware.py
  class DemonstratesConflictMiddleware(MiddlewareMixin):
      def process_template_response(self, request, response):
          return response
  
  # ...in myapp.views.py
  class DemonstratesConflictView(TemplateView): 
      template_name = "index.html"
  
  
  # ...in urls.py
  import myapp.views
  urlpatterns += [
      path('/', myapp.views.DemonstratesConflictView.as_view(), name='throws-exception'),
  ]
  
  # ... in settings.py
  
  MIDDLEWARE += ['myapp.middleware.DemonstratesConflictMiddleware']
  
  sentry_sdk.init(
      dsn="OMITTED",
      integrations=[DjangoIntegration()],
  )
  
  ```
  
  --- END ISSUE ---
  
  Below are some code segments, each from a relevant file. One or more of these files may contain bugs.
  --- BEGIN FILES ---
  Path: `sentry_sdk/integrations/django/middleware.py`
  Content:
  ```
  1 """
  2 Create spans from Django middleware invocations
  3 """
  4 
  5 from django import VERSION as DJANGO_VERSION
  6 
  7 from sentry_sdk import Hub
  8 from sentry_sdk._functools import wraps
  9 from sentry_sdk._types import MYPY
  10 from sentry_sdk.utils import (
  11     ContextVar,
  12     transaction_from_function,
  13     capture_internal_exceptions,
  14 )
  15 
  16 if MYPY:
  17     from typing import Any
  18     from typing import Callable
  19     from typing import TypeVar
  20 
  21     F = TypeVar("F", bound=Callable[..., Any])
  22 
  23 _import_string_should_wrap_middleware = ContextVar(
  24     "import_string_should_wrap_middleware"
  25 )
  26 
  27 if DJANGO_VERSION < (1, 7):
  28     import_string_name = "import_by_path"
  29 else:
  30     import_string_name = "import_string"
  31 
  32 
  33 def patch_django_middlewares():
  34     # type: () -> None
  35     from django.core.handlers import base
  36 
  37     old_import_string = getattr(base, import_string_name)
  38 
  39     def sentry_patched_import_string(dotted_path):
  40         # type: (str) -> Any
  41         rv = old_import_string(dotted_path)
  42 
  43         if _import_string_should_wrap_middleware.get(None):
  44             rv = _wrap_middleware(rv, dotted_path)
  45 
  46         return rv
  47 
  48     setattr(base, import_string_name, sentry_patched_import_string)
  49 
  50     old_load_middleware = base.BaseHandler.load_middleware
  51 
  52     def sentry_patched_load_middleware(*args, **kwargs):
  53         # type: (Any, Any) -> Any
  54         _import_string_should_wrap_middleware.set(True)
  55         try:
  56             return old_load_middleware(*args, **kwargs)
  57         finally:
  58             _import_string_should_wrap_middleware.set(False)
  59 
  60     base.BaseHandler.load_middleware = sentry_patched_load_middleware
  61 
  62 
  63 def _wrap_middleware(middleware, middleware_name):
  64     # type: (Any, str) -> Any
  65     from sentry_sdk.integrations.django import DjangoIntegration
  66 
  67     def _get_wrapped_method(old_method):
  68         # type: (F) -> F
  69         with capture_internal_exceptions():
  70 
  71             def sentry_wrapped_method(*args, **kwargs):
  72                 # type: (*Any, **Any) -> Any
  73                 hub = Hub.current
  74                 integration = hub.get_integration(DjangoIntegration)
  75                 if integration is None or not integration.middleware_spans:
  76                     return old_method(*args, **kwargs)
  77 
  78                 function_name = transaction_from_function(old_method)
  79 
  80                 description = middleware_name
  81                 function_basename = getattr(old_method, "__name__", None)
  82                 if function_basename:
  83                     description = "{}.{}".format(description, function_basename)
  84 
  85                 with hub.start_span(
  86                     op="django.middleware", description=description
  87                 ) as span:
  88                     span.set_tag("django.function_name", function_name)
  89                     span.set_tag("django.middleware_name", middleware_name)
  90                     return old_method(*args, **kwargs)
  91 
  92             try:
  93                 # fails for __call__ of function on Python 2 (see py2.7-django-1.11)
  94                 return wraps(old_method)(sentry_wrapped_method)  # type: ignore
  95             except Exception:
  96                 return sentry_wrapped_method  # type: ignore
  97 
  98         return old_method
  99 
  100     class SentryWrappingMiddleware(object):
  101         def __init__(self, *args, **kwargs):
  102             # type: (*Any, **Any) -> None
  103             self._inner = middleware(*args, **kwargs)
  104             self._call_method = None
  105 
  106         # We need correct behavior for `hasattr()`, which we can only determine
  107         # when we have an instance of the middleware we're wrapping.
  108         def __getattr__(self, method_name):
  109             # type: (str) -> Any
  110             if method_name not in (
  111                 "process_request",
  112                 "process_view",
  113                 "process_template_response",
  114                 "process_response",
  115                 "process_exception",
  116             ):
  117                 raise AttributeError()
  118 
  119             old_method = getattr(self._inner, method_name)
  120             rv = _get_wrapped_method(old_method)
  121             self.__dict__[method_name] = rv
  122             return rv
  123 
  124         def __call__(self, *args, **kwargs):
  125             # type: (*Any, **Any) -> Any
  126             f = self._call_method
  127             if f is None:
  128                 self._call_method = f = _get_wrapped_method(self._inner.__call__)
  129             return f(*args, **kwargs)
  130 
  131     if hasattr(middleware, "__name__"):
  132         SentryWrappingMiddleware.__name__ = middleware.__name__
  133 
  134     return SentryWrappingMiddleware
  135
  ```
  --- END FILES ---
  
  Please first localize the bug based on the issue statement, and then generate a patch according to the `git diff` format fenced by three backticks.
  
  Here is an example:
  
  ```diff
  diff --git a/examples/server_async.py b/examples/server_async.py
  --- a/examples/server_async.py
  +++ b/examples/server_async.py
  @@ -313,4 +313,4 @@
   
   
   if __name__ == "__main__":
  -    asyncio.run(run_async_server("."), debug=True)
  +    asyncio.run(run_async_server(), debug=True)
  diff --git a/examples/server_sync.py b/examples/server_sync.py
  --- a/examples/server_sync.py
  +++ b/examples/server_sync.py
  @@ -313,5 +313,5 @@
   
   
   if __name__ == "__main__":
  -    server = run_sync_server(".")
  +    server = run_sync_server()
       server.shutdown()
  
  ```
  
golden_diff: diff --git a/sentry_sdk/integrations/django/middleware.py b/sentry_sdk/integrations/django/middleware.py
  --- a/sentry_sdk/integrations/django/middleware.py
  +++ b/sentry_sdk/integrations/django/middleware.py
  @@ -91,9 +91,14 @@
   
               try:
                   # fails for __call__ of function on Python 2 (see py2.7-django-1.11)
  -                return wraps(old_method)(sentry_wrapped_method)  # type: ignore
  +                sentry_wrapped_method = wraps(old_method)(sentry_wrapped_method)
  +
  +                # Necessary for Django 3.1
  +                sentry_wrapped_method.__self__ = old_method.__self__  # type: ignore
               except Exception:
  -                return sentry_wrapped_method  # type: ignore
  +                pass
  +
  +            return sentry_wrapped_method  # type: ignore
   
           return old_method
  
verification_info: {"golden_diff": "diff --git a/sentry_sdk/integrations/django/middleware.py b/sentry_sdk/integrations/django/middleware.py\n--- a/sentry_sdk/integrations/django/middleware.py\n+++ b/sentry_sdk/integrations/django/middleware.py\n@@ -91,9 +91,14 @@\n \n             try:\n                 # fails for __call__ of function on Python 2 (see py2.7-django-1.11)\n-                return wraps(old_method)(sentry_wrapped_method)  # type: ignore\n+                sentry_wrapped_method = wraps(old_method)(sentry_wrapped_method)\n+\n+                # Necessary for Django 3.1\n+                sentry_wrapped_method.__self__ = old_method.__self__  # type: ignore\n             except Exception:\n-                return sentry_wrapped_method  # type: ignore\n+                pass\n+\n+            return sentry_wrapped_method  # type: ignore\n \n         return old_method\n", "issue": "DjangoIntegration conflict with MiddlewareMixin & TemplateView\ndjango version: 3.0\r\nsentry-sdk version: 0.14.3\r\n\r\nMy project has a middleware using Django's `django.utils.deprecation.MiddlewareMixin`. Visiting a view which subclasses `django.views.generic.TemplateView` while Sentry is active results in the following exception:\r\n```\r\nAttributeError: 'function' object has no attribute '__self__'\r\n  File \"django/core/handlers/exception.py\", line 47, in inner\r\n    response = get_response(request)\r\n  File \"django/core/handlers/base.py\", line 196, in _get_response\r\n    middleware_method.__self__.__class__.__name__,\r\n```\r\n\r\nThe following classes & url config should be sufficient to demonstrate the problem:\r\n\r\n```\r\nfrom django.utils.deprecation import MiddlewareMixin\r\nfrom django.views.generic import TemplateView\r\n\r\n# ...in myapp.middleware.py\r\nclass DemonstratesConflictMiddleware(MiddlewareMixin):\r\n    def process_template_response(self, request, response):\r\n        return response\r\n\r\n# ...in myapp.views.py\r\nclass DemonstratesConflictView(TemplateView): \r\n    template_name = \"index.html\"\r\n\r\n\r\n# ...in urls.py\r\nimport myapp.views\r\nurlpatterns += [\r\n    path('/', myapp.views.DemonstratesConflictView.as_view(), name='throws-exception'),\r\n]\r\n\r\n# ... in settings.py\r\n\r\nMIDDLEWARE += ['myapp.middleware.DemonstratesConflictMiddleware']\r\n\r\nsentry_sdk.init(\r\n    dsn=\"OMITTED\",\r\n    integrations=[DjangoIntegration()],\r\n)\r\n\r\n```\n", "before_files": [{"content": "\"\"\"\nCreate spans from Django middleware invocations\n\"\"\"\n\nfrom django import VERSION as DJANGO_VERSION\n\nfrom sentry_sdk import Hub\nfrom sentry_sdk._functools import wraps\nfrom sentry_sdk._types import MYPY\nfrom sentry_sdk.utils import (\n    ContextVar,\n    transaction_from_function,\n    capture_internal_exceptions,\n)\n\nif MYPY:\n    from typing import Any\n    from typing import Callable\n    from typing import TypeVar\n\n    F = TypeVar(\"F\", bound=Callable[..., Any])\n\n_import_string_should_wrap_middleware = ContextVar(\n    \"import_string_should_wrap_middleware\"\n)\n\nif DJANGO_VERSION < (1, 7):\n    import_string_name = \"import_by_path\"\nelse:\n    import_string_name = \"import_string\"\n\n\ndef patch_django_middlewares():\n    # type: () -> None\n    from django.core.handlers import base\n\n    old_import_string = getattr(base, import_string_name)\n\n    def sentry_patched_import_string(dotted_path):\n        # type: (str) -> Any\n        rv = old_import_string(dotted_path)\n\n        if _import_string_should_wrap_middleware.get(None):\n            rv = _wrap_middleware(rv, dotted_path)\n\n        return rv\n\n    setattr(base, import_string_name, sentry_patched_import_string)\n\n    old_load_middleware = base.BaseHandler.load_middleware\n\n    def sentry_patched_load_middleware(*args, **kwargs):\n        # type: (Any, Any) -> Any\n        _import_string_should_wrap_middleware.set(True)\n        try:\n            return old_load_middleware(*args, **kwargs)\n        finally:\n            _import_string_should_wrap_middleware.set(False)\n\n    base.BaseHandler.load_middleware = sentry_patched_load_middleware\n\n\ndef _wrap_middleware(middleware, middleware_name):\n    # type: (Any, str) -> Any\n    from sentry_sdk.integrations.django import DjangoIntegration\n\n    def _get_wrapped_method(old_method):\n        # type: (F) -> F\n        with capture_internal_exceptions():\n\n            def sentry_wrapped_method(*args, **kwargs):\n                # type: (*Any, **Any) -> Any\n                hub = Hub.current\n                integration = hub.get_integration(DjangoIntegration)\n                if integration is None or not integration.middleware_spans:\n                    return old_method(*args, **kwargs)\n\n                function_name = transaction_from_function(old_method)\n\n                description = middleware_name\n                function_basename = getattr(old_method, \"__name__\", None)\n                if function_basename:\n                    description = \"{}.{}\".format(description, function_basename)\n\n                with hub.start_span(\n                    op=\"django.middleware\", description=description\n                ) as span:\n                    span.set_tag(\"django.function_name\", function_name)\n                    span.set_tag(\"django.middleware_name\", middleware_name)\n                    return old_method(*args, **kwargs)\n\n            try:\n                # fails for __call__ of function on Python 2 (see py2.7-django-1.11)\n                return wraps(old_method)(sentry_wrapped_method)  # type: ignore\n            except Exception:\n                return sentry_wrapped_method  # type: ignore\n\n        return old_method\n\n    class SentryWrappingMiddleware(object):\n        def __init__(self, *args, **kwargs):\n            # type: (*Any, **Any) -> None\n            self._inner = middleware(*args, **kwargs)\n            self._call_method = None\n\n        # We need correct behavior for `hasattr()`, which we can only determine\n        # when we have an instance of the middleware we're wrapping.\n        def __getattr__(self, method_name):\n            # type: (str) -> Any\n            if method_name not in (\n                \"process_request\",\n                \"process_view\",\n                \"process_template_response\",\n                \"process_response\",\n                \"process_exception\",\n            ):\n                raise AttributeError()\n\n            old_method = getattr(self._inner, method_name)\n            rv = _get_wrapped_method(old_method)\n            self.__dict__[method_name] = rv\n            return rv\n\n        def __call__(self, *args, **kwargs):\n            # type: (*Any, **Any) -> Any\n            f = self._call_method\n            if f is None:\n                self._call_method = f = _get_wrapped_method(self._inner.__call__)\n            return f(*args, **kwargs)\n\n    if hasattr(middleware, \"__name__\"):\n        SentryWrappingMiddleware.__name__ = middleware.__name__\n\n    return SentryWrappingMiddleware\n", "path": "sentry_sdk/integrations/django/middleware.py"}], "after_files": [{"content": "\"\"\"\nCreate spans from Django middleware invocations\n\"\"\"\n\nfrom django import VERSION as DJANGO_VERSION\n\nfrom sentry_sdk import Hub\nfrom sentry_sdk._functools import wraps\nfrom sentry_sdk._types import MYPY\nfrom sentry_sdk.utils import (\n    ContextVar,\n    transaction_from_function,\n    capture_internal_exceptions,\n)\n\nif MYPY:\n    from typing import Any\n    from typing import Callable\n    from typing import TypeVar\n\n    F = TypeVar(\"F\", bound=Callable[..., Any])\n\n_import_string_should_wrap_middleware = ContextVar(\n    \"import_string_should_wrap_middleware\"\n)\n\nif DJANGO_VERSION < (1, 7):\n    import_string_name = \"import_by_path\"\nelse:\n    import_string_name = \"import_string\"\n\n\ndef patch_django_middlewares():\n    # type: () -> None\n    from django.core.handlers import base\n\n    old_import_string = getattr(base, import_string_name)\n\n    def sentry_patched_import_string(dotted_path):\n        # type: (str) -> Any\n        rv = old_import_string(dotted_path)\n\n        if _import_string_should_wrap_middleware.get(None):\n            rv = _wrap_middleware(rv, dotted_path)\n\n        return rv\n\n    setattr(base, import_string_name, sentry_patched_import_string)\n\n    old_load_middleware = base.BaseHandler.load_middleware\n\n    def sentry_patched_load_middleware(*args, **kwargs):\n        # type: (Any, Any) -> Any\n        _import_string_should_wrap_middleware.set(True)\n        try:\n            return old_load_middleware(*args, **kwargs)\n        finally:\n            _import_string_should_wrap_middleware.set(False)\n\n    base.BaseHandler.load_middleware = sentry_patched_load_middleware\n\n\ndef _wrap_middleware(middleware, middleware_name):\n    # type: (Any, str) -> Any\n    from sentry_sdk.integrations.django import DjangoIntegration\n\n    def _get_wrapped_method(old_method):\n        # type: (F) -> F\n        with capture_internal_exceptions():\n\n            def sentry_wrapped_method(*args, **kwargs):\n                # type: (*Any, **Any) -> Any\n                hub = Hub.current\n                integration = hub.get_integration(DjangoIntegration)\n                if integration is None or not integration.middleware_spans:\n                    return old_method(*args, **kwargs)\n\n                function_name = transaction_from_function(old_method)\n\n                description = middleware_name\n                function_basename = getattr(old_method, \"__name__\", None)\n                if function_basename:\n                    description = \"{}.{}\".format(description, function_basename)\n\n                with hub.start_span(\n                    op=\"django.middleware\", description=description\n                ) as span:\n                    span.set_tag(\"django.function_name\", function_name)\n                    span.set_tag(\"django.middleware_name\", middleware_name)\n                    return old_method(*args, **kwargs)\n\n            try:\n                # fails for __call__ of function on Python 2 (see py2.7-django-1.11)\n                sentry_wrapped_method = wraps(old_method)(sentry_wrapped_method)\n\n                # Necessary for Django 3.1\n                sentry_wrapped_method.__self__ = old_method.__self__  # type: ignore\n            except Exception:\n                pass\n\n            return sentry_wrapped_method  # type: ignore\n\n        return old_method\n\n    class SentryWrappingMiddleware(object):\n        def __init__(self, *args, **kwargs):\n            # type: (*Any, **Any) -> None\n            self._inner = middleware(*args, **kwargs)\n            self._call_method = None\n\n        # We need correct behavior for `hasattr()`, which we can only determine\n        # when we have an instance of the middleware we're wrapping.\n        def __getattr__(self, method_name):\n            # type: (str) -> Any\n            if method_name not in (\n                \"process_request\",\n                \"process_view\",\n                \"process_template_response\",\n                \"process_response\",\n                \"process_exception\",\n            ):\n                raise AttributeError()\n\n            old_method = getattr(self._inner, method_name)\n            rv = _get_wrapped_method(old_method)\n            self.__dict__[method_name] = rv\n            return rv\n\n        def __call__(self, *args, **kwargs):\n            # type: (*Any, **Any) -> Any\n            f = self._call_method\n            if f is None:\n                self._call_method = f = _get_wrapped_method(self._inner.__call__)\n            return f(*args, **kwargs)\n\n    if hasattr(middleware, \"__name__\"):\n        SentryWrappingMiddleware.__name__ = middleware.__name__\n\n    return SentryWrappingMiddleware\n", "path": "sentry_sdk/integrations/django/middleware.py"}]}