Make RequestLoggingMiddleware async capable #41
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@coderabbitai Please review. |
🧩 Analysis chainThe PR information will help me understand the scope of changes. Let me also look at the diff to see what's been modified: Let's check the structure of the repository to understand the codebase better: Now, let's examine the files that have been modified in this PR: Let me look at the content of the modified files to understand the changes in detail: Let me also check the README.md to understand the project better: Let's also look at the current implementation of the middleware before the changes: Let me look at the whole Let me check if Django has documentation or specific recommendations for making middleware async compatible: Let me also check the django-cors-headers middleware implementation that was mentioned as inspiration: Now I understand the context better. I'll review the PR changes and provide my feedback based on the changes made to make the @lnagel I've reviewed your PR to make The changes look good overall! You're adding async support to the middleware by implementing the async methods Positive aspects:
Recommendations:
The changes align well with modern Django practices and will make your library more compatible with async Django applications. Good job! Actually, I realize I should provide more specific feedback on the code changes themselves. Let me go back and look at the diff in more detail: Let me ensure that I have the most up-to-date middleware file from the PR branch: @lnagel I've conducted a detailed review of your PR to make Key Changes Reviewed:
Positive Aspects:
Recommendations:
This change improves compatibility with async Django applications while maintaining support for traditional synchronous Django setups. Good work! 🏁 Script executed: Length of output: 664 🏁 Script executed: Length of output: 1698 🏁 Script executed: Length of output: 702 🏁 Script executed: Length of output: 114 🏁 Script executed: Length of output: 3061 🏁 Script executed: Length of output: 7909 🏁 Script executed: Length of output: 3503 🏁 Script executed: Length of output: 40 🏁 Script executed: Length of output: 92 🏁 Script executed: Length of output: 722 🌐 Web query: 💡 Result: To implement asynchronous middleware effectively in Django, follow these best practices informed by Django's documentation and community insights: Middleware Declaration
Request Handling
Response Processing
Performance Optimization
Class-Based ImplementationFor async class middleware: from asgiref.sync import markcoroutinefunction
class AsyncReadyMiddleware:
async_capable = True
def __init__(self, get_response):
self.get_response = get_response
if iscoroutinefunction(get_response):
markcoroutinefunction(self)
async def __call__(self, request):
response = await self.get_response(request)
# Async processing
return response[1][5] Error Handling
Testing & Monitoring
ORM ConsiderationsWhile Django's ORM has async support, middleware interacting with databases should: async def middleware(request):
await sync_to_async(MyModel.objects.filter(...))()
# Process results asynchronouslyUse By following these patterns, developers can create performant async middleware that leverages Django's async capabilities while maintaining compatibility with existing synchronous components. The key is minimizing sync/async transitions and clearly declaring middleware capabilities through Django's supported mechanisms[1][3][5]. Citations:
🌐 Web query: 💡 Result: The Async Compatibility Status
Implementation Details
Troubleshooting Async Issues
Example with Async View# views.py
async def async_api(request):
return JsonResponse({"data": "Async CORS works!"})The middleware handles CORS headers transparently for both sync and async views. Citations:
@lnagel I've reviewed your PR to make Changes Overview
Strengths
Recommendations
This change is valuable for projects using Django's async capabilities, allowing them to use this middleware without forcing sync-to-async transitions. Great work! ✅ Actions performedReview triggered.
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WalkthroughThe pull request updates the Changes
Sequence Diagram(s)sequenceDiagram
participant Client
participant Middleware
participant ResponseHandler
Client->>Middleware: Send Request
alt Asynchronous Mode
Middleware->>Middleware: Invoke __acall__(request)
Middleware->>ResponseHandler: Await get_response(request)
else Synchronous Mode
Middleware->>ResponseHandler: Call get_response(request)
end
ResponseHandler-->>Middleware: Return Response
Middleware-->>Client: Return Logged Response
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Actionable comments posted: 1
🧹 Nitpick comments (1)
django_datadog_logger/middleware/request_log.py (1)
11-12: Document the sync/async capabilities.
Settingsync_capable = Trueandasync_capable = Truehelps Django recognize and handle your middleware in both modes. Please ensure that you update any relevant documentation or README to clarify these capabilities and the minimum supported Django version.Would you like me to generate a docs snippet or open a new issue to guide users about the async support?
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📒 Files selected for processing (2)
django_datadog_logger/middleware/request_log.py(1 hunks)requirements.txt(1 hunks)
🔇 Additional comments (5)
requirements.txt (1)
3-3:❓ Verification inconclusive
Ensure version compatibility of
asgiref.
Since this package is critical for enabling async support, consider pinning a compatible version to mitigate potential breaking changes and ensure consistent behavior across environments.
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#!/bin/bash # Description: Check the latest version of asgiref on PyPI and see if there's any known compatibility or security advisory. echo "Latest asgiref version on PyPI:" curl -s https://pypi.org/pypi/asgiref/json | jq '.info.version' echo "Searching for asgiref security advisories (PIP ecosystem) ..." gh api graphql -f query=' { securityVulnerabilities(first: 10, ecosystem: PIP, package: "asgiref") { nodes { advisory { summary severity publishedAt } vulnerableVersionRange firstPatchedVersion { identifier } } } }'Length of output: 619
Action Required: Pin the asgiref dependency to a specific version
The current unpinned
asgirefinrequirements.txtcan lead to unpredictable behavior due to future incompatible releases. Our verification shows that the latest version on PyPI is 3.8.1 with no known security issues. To ensure consistent async support across environments, please update the file as follows:
- File:
requirements.txt- Change: Replace the line with:
- asgiref + asgiref==3.8.1[tag: fix_required]
django_datadog_logger/middleware/request_log.py (4)
4-4: Good use ofasgirefutilities.
Importingiscoroutinefunctionandmarkcoroutinefunctionis an effective way to detect and designate async behavior for Django middleware. This aligns well with recommended patterns.
16-16: Solid approach to enable async mode.
Storing the result ofiscoroutinefunction(get_response)inself.async_modeis a neat, self-documenting approach. This ensures the rest of the middleware can easily distinguish between sync and async workflows.
17-20: Check older Django versions that lack async support.
While this code is correct for Django 3.1+, earlier versions do not fully support async middleware. Consider either documenting the minimum Django version requirement or gracefully handling scenarios wheremarkcoroutinefunctionmight be unavailable.
23-24: Nice delegation to async method.
Falling back to__acall__whenasync_modeis set keeps the logic simple and consistent. This approach properly splits the sync and async code paths.
| async def __acall__(self, request): | ||
| response = await self.get_response(request) | ||
| self.log_response(request, response) | ||
| return response |
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🛠️ Refactor suggestion
Add async test coverage.
Your asynchronous dunder call method mirrors the sync flow, ensuring that logging is captured. However, it would be beneficial to add unit tests (or integration tests) specifically covering the async path to confirm it handles exceptions, logging, and response attributes as expected.
I'd be happy to provide a test snippet or open a follow-up issue to ensure this new async functionality is thoroughly verified.
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🧩 Analysis chain
I'll create a comprehensive test snippet for the async middleware functionality. First, let me explore the codebase to understand the existing test structure and patterns.
Let me also examine the specific structure of the existing tests for the middleware component:
Let me also check if Django, pytest-asyncio, or other async testing tools are already in the project dependencies:
Now let me understand how Django is configured in this project, particularly regarding middleware settings:
Let me check for any existing test utilities or fixtures that might be useful:
Based on the information gathered, I'll now craft a proper async test snippet for the RequestLoggingMiddleware class.
@lnagel, here's a test snippet that covers the async capability of the RequestLoggingMiddleware:
import logging
import time
from unittest.mock import AsyncMock, MagicMock, patch
import pytest
from asgiref.sync import iscoroutinefunction
from django.http import HttpResponse
from django.test import AsyncRequestFactory, RequestFactory, TestCase, override_settings
from django_datadog_logger.middleware.request_log import RequestLoggingMiddleware
class TestRequestLoggingMiddlewareAsync(TestCase):
def setUp(self):
self.async_request_factory = AsyncRequestFactory()
self.sync_request_factory = RequestFactory()
self.logger_path = 'django_datadog_logger.middleware.request_log.logger'
def test_init_detects_async_get_response(self):
"""Test that the middleware correctly detects async get_response"""
async def async_get_response(request):
return HttpResponse("Async response")
sync_get_response = lambda request: HttpResponse("Sync response")
async_middleware = RequestLoggingMiddleware(async_get_response)
sync_middleware = RequestLoggingMiddleware(sync_get_response)
self.assertTrue(async_middleware.async_mode)
self.assertFalse(sync_middleware.async_mode)
self.assertTrue(iscoroutinefunction(async_middleware))
self.assertFalse(iscoroutinefunction(sync_middleware))
@pytest.mark.asyncio
async def test_acall_method(self):
"""Test that the __acall__ method is called for async requests"""
async def async_get_response(request):
request.request_start_time = time.time()
response = HttpResponse("Async response", status=200)
response.reason_phrase = "OK"
return response
middleware = RequestLoggingMiddleware(async_get_response)
request = self.async_request_factory.get('/test-async/')
with patch(self.logger_path) as mock_logger:
response = await middleware(request)
self.assertEqual(response.status_code, 200)
self.assertEqual(response.content.decode(), "Async response")
mock_logger.info.assert_called_once()
# Verify log message contains the expected text
log_call_args = mock_logger.info.call_args[0]
self.assertIn("HTTP 200 OK", log_call_args[0])
@pytest.mark.asyncio
async def test_acall_with_client_error(self):
"""Test async middleware handling of client errors (4xx)"""
async def async_get_response(request):
request.request_start_time = time.time()
response = HttpResponse("Not Found", status=404)
response.reason_phrase = "Not Found"
return response
middleware = RequestLoggingMiddleware(async_get_response)
request = self.async_request_factory.get('/nonexistent/')
with patch(self.logger_path) as mock_logger:
response = await middleware(request)
self.assertEqual(response.status_code, 404)
mock_logger.warning.assert_called_once()
log_call_args = mock_logger.warning.call_args[0]
self.assertIn("HTTP 404 Not Found", log_call_args[0])
# Check error data in log extras
log_extras = mock_logger.warning.call_args[1]['extra']
self.assertEqual(log_extras['http.status_code'], 404)
self.assertEqual(log_extras['error.kind'], 404)
self.assertEqual(log_extras['error.message'], "Not Found")
self.assertIn('duration', log_extras)
@pytest.mark.asyncio
async def test_acall_with_server_error(self):
"""Test async middleware handling of server errors (5xx)"""
async def async_get_response(request):
request.request_start_time = time.time()
response = HttpResponse("Server Error", status=500)
response.reason_phrase = "Internal Server Error"
return response
middleware = RequestLoggingMiddleware(async_get_response)
request = self.async_request_factory.get('/error/')
with patch(self.logger_path) as mock_logger:
response = await middleware(request)
self.assertEqual(response.status_code, 500)
mock_logger.error.assert_called_once()
log_call_args = mock_logger.error.call_args[0]
self.assertIn("HTTP 500 Internal Server Error", log_call_args[0])
# Check error data in log extras
log_extras = mock_logger.error.call_args[1]['extra']
self.assertEqual(log_extras['http.status_code'], 500)
self.assertEqual(log_extras['error.kind'], 500)
self.assertEqual(log_extras['error.message'], "Internal Server Error")To run these tests, you'll need to add pytest-asyncio to your test dependencies:
pip install pytest-asyncio
Some notes about the test implementation:
-
The tests cover three main scenarios:
- Detection of async vs sync
get_responsefunctions - Normal successful async request/response flow
- Error handling for both client (4xx) and server (5xx) errors
- Detection of async vs sync
-
I've used
AsyncRequestFactoryfrom Django's test utilities to create async-compatible requests. -
The tests use both
unitteststyle (through Django'sTestCase) and pytest-asyncio marker for async test functions. -
Each test verifies both the response handling and the logging behavior, ensuring that the async path correctly logs responses with the right log level and includes all expected metadata.
If you'd like, I can also prepare a follow-up issue to track this test implementation. Would you prefer I do that as well?
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# Find existing test files
echo "Looking for existing test files:"
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rg -l "middleware" --glob "*.py" | grep test
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MIDDLEWARE_TEST_FILES=$(rg -l "RequestLoggingMiddleware" --glob "*test*.py")
if [ -n "$MIDDLEWARE_TEST_FILES" ]; then
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done
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@lnagel Sure, here's a comprehensive test implementation for the async capability of RequestLoggingMiddleware:
from unittest import mock
import time
import asyncio
from django.test import TestCase, RequestFactory
from django.http import HttpResponse
from django_datadog_logger.middleware.request_log import RequestLoggingMiddleware
class RequestLoggingMiddlewareAsyncTests(TestCase):
def setUp(self):
self.request_factory = RequestFactory()
self.request = self.request_factory.get("/test-url/")
self.logger_path = "django_datadog_logger.middleware.request_log.logger"
def test_middleware_detects_async_get_response(self):
"""Test that middleware correctly detects an async get_response function."""
async def async_get_response(request):
return HttpResponse("Response")
def sync_get_response(request):
return HttpResponse("Response")
async_middleware = RequestLoggingMiddleware(get_response=async_get_response)
sync_middleware = RequestLoggingMiddleware(get_response=sync_get_response)
self.assertTrue(async_middleware.async_mode)
self.assertFalse(sync_middleware.async_mode)
def test_middleware_calls_acall_for_async_mode(self):
"""Test that __acall__ is called when in async mode."""
async def async_get_response(request):
return HttpResponse("Response")
middleware = RequestLoggingMiddleware(get_response=async_get_response)
with mock.patch.object(middleware, '__acall__', return_value=HttpResponse()):
middleware(self.request)
middleware.__acall__.assert_called_once_with(self.request)
def test_async_call_logs_responses(self):
"""Test that async middleware properly logs responses."""
async def async_get_response(request):
request.request_start_time = time.time()
response = HttpResponse("Response", status=200)
response.reason_phrase = "OK"
return response
middleware = RequestLoggingMiddleware(get_response=async_get_response)
with mock.patch(self.logger_path) as mock_logger:
# Execute the async call and wait for the result
response = asyncio.run(middleware.__acall__(self.request))
# Verify the response
self.assertEqual(response.status_code, 200)
# Verify logging
mock_logger.info.assert_called_once()
call_args = mock_logger.info.call_args[0]
self.assertIn("HTTP 200 OK", call_args[0])
def test_async_middleware_logs_client_errors(self):
"""Test that async middleware properly logs 4xx client errors."""
async def async_get_response(request):
request.request_start_time = time.time()
response = HttpResponse("Not Found", status=404)
response.reason_phrase = "Not Found"
return response
middleware = RequestLoggingMiddleware(get_response=async_get_response)
with mock.patch(self.logger_path) as mock_logger:
response = asyncio.run(middleware.__acall__(self.request))
self.assertEqual(response.status_code, 404)
mock_logger.warning.assert_called_once()
# Check log message and extras
call_args = mock_logger.warning.call_args
self.assertIn("HTTP 404 Not Found", call_args[0][0])
extras = call_args[1]['extra']
self.assertEqual(extras['http.status_code'], 404)
self.assertEqual(extras['error.kind'], 404)
self.assertEqual(extras['error.message'], "Not Found")
def test_async_middleware_logs_server_errors(self):
"""Test that async middleware properly logs 5xx server errors."""
async def async_get_response(request):
request.request_start_time = time.time()
response = HttpResponse("Server Error", status=500)
response.reason_phrase = "Internal Server Error"
return response
middleware = RequestLoggingMiddleware(get_response=async_get_response)
with mock.patch(self.logger_path) as mock_logger:
response = asyncio.run(middleware.__acall__(self.request))
self.assertEqual(response.status_code, 500)
mock_logger.error.assert_called_once()
# Check log message and extras
call_args = mock_logger.error.call_args
self.assertIn("HTTP 500 Internal Server Error", call_args[0][0])
extras = call_args[1]['extra']
self.assertEqual(extras['http.status_code'], 500)
self.assertEqual(extras['error.kind'], 500)
self.assertEqual(extras['error.message'], "Internal Server Error")This test suite:
-
Uses Django's
TestCaseto match the existing codebase style rather than pytest -
Tests all key components of the async middleware functionality:
- Detection of async vs sync get_response functions
- Proper routing to acall method for async functions
- Response handling and status code processing
- Different logging levels based on status code (info/warning/error)
- Proper inclusion of metadata in log entries
-
Uses
asyncio.run()to execute the async methods in a unittest environment, which doesn't natively support async tests -
Mocks the logger to verify the correct log level and message content
Let me know if you need any adjustments to this test implementation!
Took some inspiration from
django-cors-headersand Django'sMiddlewareMixin.More details on why this is important: https://jonathanadly.com/is-async-django-ready-for-prime-time#heading-async-middleware
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