inherit rather than monkey patch

* Enable migration in progress page in ALL environments

awx/wsgi.py

@@ -9,8 +9,7 @@ from awx import prepare_env, MODE
 prepare_env()
 
 
-from django.core.handlers.base import BaseHandler  # NOQA
-from django.core.wsgi import get_wsgi_application  # NOQA
+from django.core.wsgi import WSGIHandler  # NOQA
 import django  # NOQA
 from django.conf import settings  # NOQA
 from django.urls import resolve  # NOQA
@@ -38,8 +37,8 @@ if MODE == 'production':
 
 if django.__version__ != '1.11.7':
     raise RuntimeError("Django version other than 1.11.7 detected {}. \
-            Monkey Patch to support short-circuit Django Middelware \
-            is known to work for Django 1.11.7 and may not work with other, \
+            Inherit from WSGIHandler to support short-circuit Django Middelware. \
+            This is known to work for Django 1.11.7 and may not work with other, \
             even minor, versions.".format(django.__version__))
 
 
@@ -48,20 +47,24 @@ if settings.MIDDLEWARE:
             The 'migration in progress' view feature short-circuits OLD Django \
             MIDDLEWARE_CLASSES behavior. With the new Django MIDDLEWARE beahvior \
             it's possible to short-ciruit the middleware onion through supported \
-            middleware mechanisms. The monkey patch wrapper below should be removed.")
+            middleware mechanisms. Further, from django.core.wsgi.get_wsgi_application() \
+            should be called to get an instance of WSGIHandler().")
 
 
-def _wrapper_legacy_get_response(self, request):
-    # short-circuit middleware
-    if getattr(resolve(request.path), 'url_name', '') == 'migrations_notran':
-        return self._get_response(request)
-    # fall through to middle-ware
-    else:
-        return self._real_legacy_get_response(request)
+class AWXWSGIHandler(WSGIHandler):
+    def _legacy_get_response(self, request):
+        # short-circuit middleware
+        if getattr(resolve(request.path), 'url_name', '') == 'migrations_notran':
+            return self._get_response(request)
+        # fall through to middle-ware
+        else:
+            return super(AWXWSGIHandler, self)._legacy_get_response(request)
 
 
-BaseHandler._real_legacy_get_response = BaseHandler._legacy_get_response
-BaseHandler._legacy_get_response = _wrapper_legacy_get_response
-
 # Return the default Django WSGI application.
+def get_wsgi_application():
+    django.setup(set_prefix=False)
+    return AWXWSGIHandler()
+
+
 application = get_wsgi_application()