Fix ImportError with slash-delimited Lambda handler paths #3894
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AWS Lambda accepts handler paths in both formats: - Slash-delimited: python/functions/api.handler - Dot-delimited: python.functions.api.handler The instrumentation was failing when slash-delimited paths were used because it attempted to import invalid Python module paths containing forward slashes. This fix normalizes the handler path by converting slashes to dots before splitting the module and function names. Fixes open-telemetry#1465
- Add changelog entry in Unreleased section - Add unit test verifying both slash and dot-delimited handler paths work - Test confirms instrumentation handles both formats correctly Related to open-telemetry#1465
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tammy-baylis-swi
approved these changes
Oct 28, 2025
Co-authored-by: Tammy Baylis <[email protected]>
emdneto
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Oct 28, 2025
xrmx
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Oct 30, 2025
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Description
AWS Lambda accepts handler paths in both formats:
python/functions/api.handlerpython.functions.api.handlerThe instrumentation was failing when slash-delimited paths were used because it attempted to import invalid Python module paths containing forward slashes. This fix normalizes the handler path by converting slashes to dots before splitting the module and function names.
Fixes #1465
Type of change
How Has This Been Tested?
test_slash_delimited_handler_path()that verifies both slash-delimited and dot-delimited handler paths work correctlypython/functions/api.handler) in production environmentImportError: No module named 'python/functions/api', now works correctlyDoes This PR Require a Core Repo Change?
Checklist:
See contributing.md for styleguide, changelog guidelines, and more.