zappa / Zappa / 22704795007
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Add ASGI support and refactor codebase (#1422)

* :sparkles: add ASGI support :recycle: refactor codebase for clarity

Add ASGI handler supporting FastAPI, Starlette, and Quart frameworks on
AWS Lambda with API Gateway v1/v2, ALB, and Function URL events. Includes
ASGIHandler bridge, scope/body creation, autodetection, and full test suite.

Refactor across two rounds:
- :bug: fix response_time units (ms -> μs) in ASGI/WSGI v2 handlers
- :fire: remove Python 2 remnants (builtins imports, getargspec fallback)
- :recycle: extract shared helpers (extract_request_body, _detect_apps_by_pattern,
  _handle_request_exception, _get_boto_session, import_and_get_function)
- :recycle: deduplicate AWS region lists, consolidate BINARY_METHODS in utilities
- :recycle: move HTTPStatus import to module level, remove dead code paths
- :bug: fix mutable default arg in create_wsgi_request
- :bug: fix resource leaks in letsencrypt.py (unclosed file handles)
- :art: replace debug print() with logger.debug() in cognito trigger
- :fire: remove redundant logger, unnecessary .keys() calls, dead NameError handler

* :memo: add ASGI documentation to README

Add ASGI Support section with FastAPI, Starlette, and Quart setup
guides. Document app_type setting, binary support behavior, handler
internals, and current limitations.

* :wrench: address PR review feedback from Copilot

- Safe port parsing with try/except in asgi.py
- Return http.disconnect immediately in ASGIHandler.receive()
- Validate ASGI callable when app_type="asgi" is set
- Fix resolve_context_headers KeyError with safe .get()
- Fix v2 response_body default from None to ""
- Always set body in v1 ASGI response (even when empty)
- Fix memory allocation in _log_asgi_request
- Correct README: "asyncio event loop" not "asyncio.run()"

* :recycle: normalize header keys in create_asgi_scope

Use lowercase header dict for consistent lookups, defer byte encoding
to just before scope construction.

---------

Co-authored-by: ... (continued)

3551 of 4797 relevant lines covered (74.03%)

4.44 hits per line

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Lines Coverage ∆ File
2
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28
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 -0.85% asynchronous.py
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 8.04% handler.py
128
62.72
 1.44% utilities.py
204
73.74
 -0.03% cli.py
311
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 0.0% core.py
Jobs
ID Job ID Ran Files Coverage
1 py3.9 - 22704795007.1 14
74.03
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2 py3.14 - 22704795007.2 14
74.03
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3 py3.12 - 22704795007.3 14
74.03
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4 py3.10 - 22704795007.4 14
74.03
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5 py3.11 - 22704795007.5 14
74.03
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6 py3.13 - 22704795007.6 14
74.03
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Source Files on build 22704795007