Add context to exception handler #2236

Same context as renderers which include: the view,
args, kwargs, and request.

This provides enough contextual information to the
exception handlers to handle errors better.

In a use case like #1671, a custom handler
would allow Sentry to log the request properly.

rest_framework/views.py

@@ -46,7 +46,7 @@ def get_view_description(view_cls, html=False):
     return description
 
 
-def exception_handler(exc):
+def exception_handler(exc, context=None):
     """
     Returns the response that should be used for any given exception.
 
@@ -369,7 +369,8 @@ class APIView(View):
             else:
                 exc.status_code = status.HTTP_403_FORBIDDEN
 
-        response = self.settings.EXCEPTION_HANDLER(exc)
+        context = self.get_renderer_context()
+        response = self.settings.EXCEPTION_HANDLER(exc, context)
 
         if response is None:
             raise

tests/test_views.py

@@ -121,7 +121,12 @@ class TestCustomExceptionHandler(TestCase):
     def setUp(self):
         self.DEFAULT_HANDLER = api_settings.EXCEPTION_HANDLER
 
-        def exception_handler(exc):
+        def exception_handler(exc, context=None):
+            self.assertTrue('args' in context)
+            self.assertTrue('kwargs' in context)
+            self.assertTrue('request' in context)
+            self.assertTrue('view' in context)
+
             return Response('Error!', status=status.HTTP_400_BAD_REQUEST)
 
         api_settings.EXCEPTION_HANDLER = exception_handler