feat: add flag to run functions framework in asgi stack #376
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- Add uvicorn and uvicorn-worker to async optional dependencies - Refactor gunicorn.py with BaseGunicornApplication for shared config - Add UvicornApplication class for ASGI apps - Add StarletteApplication in asgi.py for development mode - Update HTTPServer to auto-detect Flask (WSGI) vs other (ASGI) apps - Add --gateway CLI flag to choose between wsgi and asgi - Update test_http.py to use Flask instance in tests
- Add tests for HTTPServer ASGI/WSGI auto-detection - Add tests for StarletteApplication and UvicornApplication - Add tests for CLI --gateway flag functionality - Add integration tests for async functions with ASGI - Ensure 100% code coverage for new ASGI features - Apply black and isort formatting to test files
ASGI mode does not support automatic conversion from legacy events to CloudEvents, so validateMapping must be false for CloudEvent conformance tests.
Create a copy of the options dict before modifying it to prevent side effects when the same options dict is reused elsewhere. This could cause issues with timeout tests.
…ling - Add pragma: no cover comments for ASGI-specific code paths that won't execute in Python 3.7 - Fix options dict handling to use consistent variable names to avoid confusion
…asses Remove the BaseGunicornApplication abstraction as it was causing issues with the timeout mechanism. Each class now independently extends gunicorn.app.base.BaseApplication, which is cleaner and avoids the problems we were seeing with shared state and options handling.
Remove unnecessary changes to GunicornApplication class, keeping only the UvicornApplication addition for ASGI support.
maemayve
approved these changes
Jun 12, 2025
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This PR introduces a new flag to enable ASGI support to the Functions Framework for Python allowing users to run asynchronous functions.
Key changes:
--gatewayflag. The available options arewsgi(default) andasgi.Note: This PR does not include support for execution ID and Jinja2 templates for ASGI applications. This will be addressed in a subsequent PR.