Fixed support for Django 4.1 (#1159)

Author: JeremyVriens

contrib/opencensus-ext-django/CHANGELOG.md

@@ -2,6 +2,9 @@
 
 ## Unreleased
 
+- Fixed support for Django 4.1
+- ([#1159](https://github.com/census-instrumentation/opencensus-python/pull/1159))
+
 ## 0.7.5
 Released 2021-05-13
 

contrib/opencensus-ext-django/opencensus/ext/django/middleware.py

@@ -146,8 +146,8 @@ def _trace_db_call(execute, sql, params, many, context):
 class OpencensusMiddleware(MiddlewareMixin):
     """Saves the request in thread local"""
 
-    def __init__(self, get_response=None):
-        self.get_response = get_response
+    def __init__(self, get_response):
+        super(OpencensusMiddleware, self).__init__(get_response)
         settings = getattr(django.conf.settings, 'OPENCENSUS', {})
         settings = settings.get('TRACE', {})
 

contrib/opencensus-ext-django/tests/test_django_db_middleware.py

@@ -18,11 +18,16 @@
 import django
 import mock
 import pytest
+from django.http import HttpResponse
 from django.test.utils import teardown_test_environment
 
 from opencensus.trace import execution_context
 
 
+def get_response(request):
+    return HttpResponse()
+
+
 class TestOpencensusDatabaseMiddleware(unittest.TestCase):
     def setUp(self):
         from django.conf import settings as django_settings
@@ -50,7 +55,7 @@ def test_process_request(self):
         mock_execute = mock.Mock()
         mock_execute.return_value = "Mock result"
 
-        middleware.OpencensusMiddleware()
+        middleware.OpencensusMiddleware(get_response)
 
         patch_no_tracer = mock.patch(
             'opencensus.ext.django.middleware._get_current_tracer',

contrib/opencensus-ext-django/tests/test_django_middleware.py

@@ -17,6 +17,7 @@
 import unittest
 
 import mock
+from django.http import HttpResponse
 from django.test import RequestFactory
 from django.test.utils import teardown_test_environment
 
@@ -27,6 +28,10 @@
 from opencensus.trace.propagation import trace_context_http_header_format
 
 
+def get_response(request):
+    return HttpResponse()
+
+
 class TestOpencensusMiddleware(unittest.TestCase):
 
     def setUp(self):
@@ -44,7 +49,7 @@ def tearDown(self):
     def test_constructor_default(self):
         from opencensus.ext.django import middleware
 
-        middleware = middleware.OpencensusMiddleware()
+        middleware = middleware.OpencensusMiddleware(get_response)
 
         assert isinstance(middleware.sampler, samplers.ProbabilitySampler)
         assert isinstance(middleware.exporter, print_exporter.PrintExporter)
@@ -69,7 +74,7 @@ def test_configuration(self):
             settings)
 
         with patch_settings:
-            middleware = middleware.OpencensusMiddleware()
+            middleware = middleware.OpencensusMiddleware(get_response)
 
         assert isinstance(middleware.sampler, samplers.AlwaysOnSampler)
         assert isinstance(middleware.exporter, print_exporter.PrintExporter)
@@ -100,7 +105,7 @@ def test_process_request(self):
             settings)
 
         with patch_settings:
-            middleware_obj = middleware.OpencensusMiddleware()
+            middleware_obj = middleware.OpencensusMiddleware(get_response)
 
         # test process_request
         middleware_obj.process_request(django_request)
@@ -148,7 +153,7 @@ def test_excludelist_path(self):
             settings)
 
         with patch_settings:
-            middleware_obj = middleware.OpencensusMiddleware()
+            middleware_obj = middleware.OpencensusMiddleware(get_response)
 
         django_request = RequestFactory().get('/test_excludelist_path')
         disabled = utils.disable_tracing_url(django_request.path,
@@ -204,7 +209,7 @@ def test_process_response(self):
             settings)
 
         with patch_settings:
-            middleware_obj = middleware.OpencensusMiddleware()
+            middleware_obj = middleware.OpencensusMiddleware(get_response)
 
         middleware_obj.process_request(django_request)
         tracer = middleware._get_current_tracer()
@@ -259,7 +264,7 @@ def test_process_response_unfinished_child_span(self):
             settings)
 
         with patch_settings:
-            middleware_obj = middleware.OpencensusMiddleware()
+            middleware_obj = middleware.OpencensusMiddleware(get_response)
 
         middleware_obj.process_request(django_request)
         tracer = middleware._get_current_tracer()
@@ -316,7 +321,7 @@ def test_process_exception(self):
             settings)
 
         with patch_settings:
-            middleware_obj = middleware.OpencensusMiddleware()
+            middleware_obj = middleware.OpencensusMiddleware(get_response)
 
         tb = None
         try: