[feiiiiii5]

What does this PR do?

End an OpenAI observation when cancellation interrupts the awaited request before a response arrives, then re-raise the original cancellation. Previously, the SDK propagated cancellation but Langfuse never ended or exported that observation.

The same wrapper covers chat completions, Responses, and embeddings. Cancellation after a stream returns continues through the existing stream finalizer.

Type of change

• Bug fix

Verification

Five regressions use real AsyncOpenAI clients with a waiting HTTP mock transport and the in-memory exporter. All five fail on main because no ended observation is exported, and pass here. They retain the cancellation object/message and record no invented output, usage, cost, or error status.

Python 3.13.18, locked OpenAI 2.29.0 and HTTPX 0.28.1:

uv run --frozen pytest tests/unit/test_openai.py tests/unit/test_openai_prompt_extraction.py -q --tb=short
# 66 passed
uv run --frozen pytest -n 2 --dist worksteal tests/unit -q --tb=short
# 1020 passed, 2 skipped
uv run --frozen ruff check .
uv run --frozen ruff format --check langfuse/openai.py tests/unit/test_openai.py
uv run --frozen mypy langfuse --no-error-summary

The full suite uses the existing tracked fixtures and public CI dummy credentials. Lint, formatting, mypy, independent base/head replay, and diff review pass. Live-provider/server suites were not run; this behavior is covered by exporter-local unit tests.

Checklist

• I self-reviewed the diff using code_review.md.
• I added or updated tests for behavior changes.
• I updated docs, examples, or .env.template if needed. (Not applicable.)
• I did not hand-edit generated files; if generated files changed, I used the upstream regeneration path.
• I did not commit secrets or credentials.

Confidence Score: 5/5

The PR appears safe to merge.

Summary

Ends OpenAI observations when cancellation interrupts a request before a response, then re-raises the original cancellation.

• Async OpenAI cancellations now end their Langfuse observations.

_{Reviews (2) · Last reviewed commit: "test(openai): move cancellation transpor..." · Reviewed by Greptile}

[claude]

Claude Code Review

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[chatgpt-codex-connector]

Codex Review Summary

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Review	Status	Commit	Review trigger
📝 Code Review	✅ Completed 2026-11-06T16:20:57.000526Z	716a58e	PR opened

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[feiiiiii5]

Moved httpx to the module imports in 0685844, addressing this comment. The full unit suite passes again (1020 passed, 2 skipped), along with Ruff and formatting checks.