fix(asm): improve BlockingException catch for fastapi [backport 3.0] #12423
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Fastapi middleware use BaseExceptionGroup on python 3.11. With a custom middleware, this mechanism could encapsulate BlockingException raised by our blocking mechanism, preventing it to be properly caught to generate a proper blocking response. This will be tested permanently by the `fastapi` weblog, as DataDog/system-tests#4125 adds a custom middleware to simulate ATO automatic instrumentation. Due to our mandatory compatibility with previous python version, we can't use syntaxic sugar to handle exception group. ## Checklist - [x] PR author has checked that all the criteria below are met - The PR description includes an overview of the change - The PR description articulates the motivation for the change - The change includes tests OR the PR description describes a testing strategy - The PR description notes risks associated with the change, if any - Newly-added code is easy to change - The change follows the [library release note guidelines](https://ddtrace.readthedocs.io/en/stable/releasenotes.html) - The change includes or references documentation updates if necessary - Backport labels are set (if [applicable](https://ddtrace.readthedocs.io/en/latest/contributing.html#backporting)) ## Reviewer Checklist - [x] Reviewer has checked that all the criteria below are met - Title is accurate - All changes are related to the pull request's stated goal - Avoids breaking [API](https://ddtrace.readthedocs.io/en/stable/versioning.html#interfaces) changes - Testing strategy adequately addresses listed risks - Newly-added code is easy to change - Release note makes sense to a user of the library - If necessary, author has acknowledged and discussed the performance implications of this PR as reported in the benchmarks PR comment - Backport labels are set in a manner that is consistent with the [release branch maintenance policy](https://ddtrace.readthedocs.io/en/latest/contributing.html#backporting) (cherry picked from commit f3e0eb3)
avara1986
approved these changes
Feb 20, 2025
emmettbutler
approved these changes
Feb 20, 2025
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Backport f3e0eb3 from #12413 to 3.0.
Fastapi middleware use BaseExceptionGroup on python 3.11. With a custom middleware, this mechanism could encapsulate BlockingException raised by our blocking mechanism, preventing it to be properly caught to generate a proper blocking response.
This will be tested permanently by the
fastapiweblog, as DataDog/system-tests#4125 adds a custom middleware to simulate ATO automatic instrumentation.Due to our mandatory compatibility with previous python version, we can't use syntaxic sugar to handle exception group.
APPSEC-56814
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