Added metrics to auth class (#91)

We are currently in the middle to removing the deprecated oauth2authentication from edx-platform and this is one of the last libraries that uses it. These changes would allow us to see if this class is currently in use or not.

organizations/__init__.py

@@ -1,4 +1,4 @@
 """
 edx-organizations app initialization module
 """
-__version__ = '2.2.0'  # pragma: no cover
+__version__ = '2.2.1'  # pragma: no cover

organizations/authentication.py

@@ -0,0 +1,24 @@
+"""Temp auth class to see how often oauth2authentication class is used in organizations"""
+from rest_framework_oauth.authentication import OAuth2Authentication
+from edx_django_utils.monitoring import set_custom_metric
+
+
+class OAuth2AuthenticationDeprecated(OAuth2Authentication):
+    """
+    This child class was added to add new_relic metrics to OAuth2Authentication. This should be very temporary.
+    """
+
+    def authenticate(self, request):
+        """
+        Returns two-tuple of (user, token) if access token authentication
+        succeeds, None if the user did not try to authenticate using an access
+        token, or raises an AuthenticationFailed (HTTP 401) if authentication
+        fails.
+        """
+        set_custom_metric("OAuth2AuthenticationDeprecated", "Failed")
+        output = super(OAuth2AuthenticationDeprecated, self).authenticate(request)
+        if output is None:
+            set_custom_metric("OAuth2AuthenticationDeprecated", "None")
+        else:
+            set_custom_metric("OAuth2AuthenticationDeprecated", "Success")
+        return output

organizations/v0/views.py

@@ -10,11 +10,11 @@
 from rest_framework.authentication import SessionAuthentication
 from rest_framework.permissions import IsAuthenticated
 from rest_framework.response import Response
-from rest_framework_oauth.authentication import OAuth2Authentication
 
 from organizations.models import Organization
 from organizations.permissions import UserIsStaff
 from organizations.serializers import OrganizationSerializer
+from organizations.authentication import OAuth2AuthenticationDeprecated
 
 
 class OrganizationsViewSet(mixins.UpdateModelMixin, viewsets.ReadOnlyModelViewSet):
@@ -26,7 +26,7 @@ class OrganizationsViewSet(mixins.UpdateModelMixin, viewsets.ReadOnlyModelViewSe
     queryset = Organization.objects.filter(active=True)  # pylint: disable=no-member
     serializer_class = OrganizationSerializer
     lookup_field = 'short_name'
-    authentication_classes = (OAuth2Authentication, JwtAuthentication, SessionAuthentication)
+    authentication_classes = (JwtAuthentication, OAuth2AuthenticationDeprecated, SessionAuthentication)
     permission_classes = (IsAuthenticated, UserIsStaff)
 
     def update(self, request, *args, **kwargs):