middleware: Send got_request_exception signal for JSON 500 errors.

This is ordinarily emitted by Django at
  https://github.com/django/django/blob/4.2.6/django/core/handlers/exception.py#L139
and received by Sentry at
  https://github.com/getsentry/sentry-python/blob/1.31.0/sentry_sdk/integrations/django/__init__.py#L166

Signed-off-by: Anders Kaseorg <anders@zulip.com>

zerver/middleware.py

@@ -7,6 +7,7 @@ from urllib.parse import urlencode, urljoin
 
 from django.conf import settings
 from django.conf.urls.i18n import is_language_prefix_patterns_used
+from django.core import signals
 from django.db import connection
 from django.http import HttpRequest, HttpResponse, HttpResponseRedirect
 from django.http.response import HttpResponseBase
@@ -383,7 +384,21 @@ class JsonErrorHandler(MiddlewareMixin):
 
         if isinstance(exception, JsonableError):
             response = json_response_from_error(exception)
-            if response.status_code >= 500:
+            if response.status_code < 500:
+                return response
+        elif RequestNotes.get_notes(request).error_format == "JSON" and not settings.TEST_SUITE:
+            response = json_response(res_type="error", msg=_("Internal server error"), status=500)
+        else:
+            return None
+
+        # Send the same signal that Django sends for an unhandled exception.
+        # This is received by Sentry to log exceptions, and also by the Django
+        # test HTTP client to show better error messages.
+        try:
+            raise exception  # Ensure correct sys.exc_info().
+        except BaseException:
+            signals.got_request_exception.send(sender=None, request=request)
+
         # Here we use Django's log_response the way Django uses
         # it normally to log error responses. However, we make the small
         # modification of including the traceback to make the log message
@@ -399,20 +414,6 @@ class JsonErrorHandler(MiddlewareMixin):
         )
         return response
 
-        if RequestNotes.get_notes(request).error_format == "JSON" and not settings.TEST_SUITE:
-            response = json_response(res_type="error", msg=_("Internal server error"), status=500)
-            log_response(
-                "%s: %s",
-                response.reason_phrase,
-                request.path,
-                response=response,
-                request=request,
-                exception=exception,
-            )
-            return response
-
-        return None
-
 
 class TagRequests(MiddlewareMixin):
     def process_view(

zerver/openapi/openapi.py

@@ -373,9 +373,6 @@ def validate_against_openapi_schema(
     # This first set of checks are primarily training wheels that we
     # hope to eliminate over time as we improve our API documentation.
 
-    # No 500 responses have been documented, so skip them
-    if status_code.startswith("5"):
-        return False
     if path not in openapi_spec.openapi()["paths"]:
         endpoint = find_openapi_endpoint(path)
         # If it doesn't match it hasn't been documented yet.

zerver/tests/test_health.py

@@ -16,9 +16,10 @@ class HealthTest(ZulipTestCase):
         with mock.patch(
             "zerver.views.health.check_database",
             side_effect=ServerNotReadyError("Cannot query postgresql"),
-        ), self.assertLogs(level="ERROR") as logs:
-            result = self.client_get("/health")
-        self.assert_json_error(result, "Cannot query postgresql", status_code=500)
+        ), self.assertLogs(level="ERROR") as logs, self.assertRaisesRegex(
+            ServerNotReadyError, r"^Cannot query postgresql$"
+        ):
+            self.client_get("/health")
         self.assertIn(
             "zerver.lib.exceptions.ServerNotReadyError: Cannot query postgresql", logs.output[0]
         )

zerver/tests/test_integrations_dev_panel.py

@@ -1,6 +1,7 @@
 from unittest.mock import MagicMock, patch
 
 import orjson
+from django.core.exceptions import ValidationError
 
 from zerver.lib.test_classes import ZulipTestCase
 from zerver.models import Message, Stream, get_realm, get_user
@@ -21,16 +22,14 @@ class TestIntegrationsDevPanel(ZulipTestCase):
             "custom_headers": "{}",
             "is_json": "true",
         }
-        with self.assertLogs(level="ERROR") as logs, self.settings(TEST_SUITE=False):
-            response = self.client_post(target_url, data)
-
-            self.assertEqual(response.status_code, 500)  # Since the response would be forwarded.
-            expected_response = {"result": "error", "msg": "Internal server error"}
-            self.assertEqual(orjson.loads(response.content), expected_response)
+        with self.assertLogs(level="ERROR") as logs, self.settings(
+            TEST_SUITE=False
+        ), self.assertRaises(ValidationError):
+            self.client_post(target_url, data)
 
         # Intention of this test looks like to trigger ValidationError
         # so just testing ValidationError is printed along with Traceback in logs
-        self.assert_length(logs.output, 1)
+        self.assert_length(logs.output, 2)
         self.assertTrue(
             logs.output[0].startswith(
                 "ERROR:django.request:Internal Server Error: /api/v1/external/airbrake\n"
@@ -38,6 +37,13 @@ class TestIntegrationsDevPanel(ZulipTestCase):
             )
         )
         self.assertTrue("ValidationError" in logs.output[0])
+        self.assertTrue(
+            logs.output[1].startswith(
+                "ERROR:django.request:Internal Server Error: /devtools/integrations/check_send_webhook_fixture_message\n"
+                "Traceback (most recent call last):\n"
+            )
+        )
+        self.assertTrue("ValidationError" in logs.output[1])
 
     def test_check_send_webhook_fixture_message_for_success_without_headers(self) -> None:
         bot = get_user("webhook-bot@zulip.com", self.zulip_realm)

zerver/tests/test_push_notifications.py

@@ -563,12 +563,11 @@ class PushBouncerNotificationTest(BouncerTestCase):
             URL = settings.PUSH_NOTIFICATION_BOUNCER_URL + "/api/v1/remotes/push/register"
             with responses.RequestsMock() as resp, self.assertLogs(level="ERROR") as error_log:
                 resp.add(responses.POST, URL, body=ConnectionError(), status=502)
-                result = self.client_post(endpoint, {"token": token}, subdomain="zulip")
-                self.assert_json_error(
-                    result,
-                    "ConnectionError while trying to connect to push notification bouncer",
-                    502,
-                )
+                with self.assertRaisesRegex(
+                    PushNotificationBouncerRetryLaterError,
+                    r"^ConnectionError while trying to connect to push notification bouncer$",
+                ):
+                    self.client_post(endpoint, {"token": token}, subdomain="zulip")
                 self.assertIn(
                     f"ERROR:django.request:Bad Gateway: {endpoint}\nTraceback",
                     error_log.output[0],
@@ -576,8 +575,11 @@ class PushBouncerNotificationTest(BouncerTestCase):
 
             with responses.RequestsMock() as resp, self.assertLogs(level="WARNING") as warn_log:
                 resp.add(responses.POST, URL, body=orjson.dumps({"msg": "error"}), status=500)
-                result = self.client_post(endpoint, {"token": token}, subdomain="zulip")
-                self.assert_json_error(result, "Received 500 from push notification bouncer", 502)
+                with self.assertRaisesRegex(
+                    PushNotificationBouncerRetryLaterError,
+                    r"Received 500 from push notification bouncer$",
+                ):
+                    self.client_post(endpoint, {"token": token}, subdomain="zulip")
                 self.assertEqual(
                     warn_log.output[0],
                     "WARNING:root:Received 500 from push notification bouncer",

zerver/views/development/integrations.py

@@ -120,7 +120,7 @@ def check_send_webhook_fixture_message(
     if response.status_code == 200:
         responses = [{"status_code": response.status_code, "message": response.content.decode()}]
         return json_success(request, data={"responses": responses})
-    else:
+    else:  # nocoverage
         return response