fix: Remove keyword only argument for RequestsMiddleware (#113)

* fix: Remove keyword only argument for RequestsMiddleware

Remove keyword only arguments from request middleware. This causes
django to fail when attempting to load middleware. Django currently only
supports handlers being passed in as args.

* Test that we can instantiate middleware with or without kwargs

* Make get_response a required parameter in RequestMiddleware

google/cloud/logging_v2/handlers/middleware/request.py

@@ -42,7 +42,7 @@ def _get_django_request():
 class RequestMiddleware(MiddlewareMixin):
     """Saves the request in thread local"""
 
-    def __init__(self, *, get_response=None):
+    def __init__(self, get_response):
         self.get_response = get_response
 
     def process_request(self, request):

tests/unit/handlers/middleware/test_request.py

@@ -41,6 +41,9 @@ def _get_target_class(self):
         return request.RequestMiddleware
 
     def _make_one(self, *args, **kw):
+        if not args and "get_response" not in kw:
+            kw["get_response"] = None
+
         return self._get_target_class()(*args, **kw)
 
     def test_process_request(self):
@@ -54,6 +57,16 @@ def test_process_request(self):
         django_request = request._get_django_request()
         self.assertEqual(django_request, mock_request)
 
+    def test_can_instantiate_middleware_without_kwargs(self):
+        handler = mock.Mock()
+        middleware = self._make_one(handler)
+        self.assertEqual(middleware.get_response, handler)
+
+    def test_can_instantiate_middleware_with_kwargs(self):
+        handler = mock.Mock()
+        middleware = self._make_one(get_response=handler)
+        self.assertEqual(middleware.get_response, handler)
+
 
 class Test__get_django_request(DjangoBase):
     @staticmethod

tests/unit/handlers/test__helpers.py

@@ -87,7 +87,7 @@ def test_no_context_header(self):
 
         django_request = RequestFactory().get("/")
 
-        middleware = request.RequestMiddleware()
+        middleware = request.RequestMiddleware(None)
         middleware.process_request(django_request)
         trace_id = self._call_fut()
         self.assertIsNone(trace_id)
@@ -104,7 +104,7 @@ def test_valid_context_header(self):
             "/", **{django_trace_header: django_trace_id}
         )
 
-        middleware = request.RequestMiddleware()
+        middleware = request.RequestMiddleware(None)
         middleware.process_request(django_request)
         trace_id = self._call_fut()