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## Description Adds an explicit, idempotent async cleanup lifecycle for the LiteLLM callback's shared cloud HTTP client. Fixes #2894 ## Type of Change - [x] Bug fix (non-breaking change that fixes an issue) - [ ] New feature (non-breaking change that adds functionality) - [ ] Breaking change (fix or feature that would cause existing functionality to change) - [ ] Documentation update - [ ] Performance improvement - [ ] Code refactoring (no functional changes) ## Changes Made - Added `HeadroomCallback.aclose()` to close the lazily-created `httpx.AsyncClient` and clear its reference. - Made cleanup safe when cloud mode was never used and when shutdown cleanup is invoked more than once. - Added regression coverage for initialized-client cleanup, reference clearing, and repeated/no-op cleanup. ## Testing - [x] Unit tests pass (`pytest`) - [x] Linting passes (`ruff check .`) - [x] Type checking passes (`mypy headroom`) - [x] New tests added for new functionality - [x] Manual testing performed ### Test Output ```text python -m pytest -q tests/test_integrations/test_litellm_callback.py 5 passed ruff check . All checks passed! ruff format --check . 1382 files already formatted python -m mypy headroom Success: no issues found in 515 source files python -m pytest -q Collection blocked in this Windows environment by 174 errors, primarily missing compiled headroom._core; one unrelated test also lacks respx. ``` ## Real Behavior Proof - Environment: Windows, Python 3.12, loopback HTTP server, real `httpx.AsyncClient`. - Exact command / steps: Started a local HTTP server, configured `HeadroomCallback(api_key="hdr_test", api_url="http://127.0.0.1:<port>")`, ran `_cloud_compress()` against it, saved the created client, awaited `callback.aclose()`, then awaited `callback.aclose()` again. - Observed result: The real cloud request succeeded; the client was open during the request, reported closed after `aclose()`, the callback reference became `None`, and repeated cleanup was harmless. - Who maintains it: Headroom Labs maintains this active upstream repository and its LiteLLM integration. - Install surface: No dependencies or install behavior changed. Cloud mode continues to use the existing optional `httpx` dependency; no native code or runtime network access is introduced by this fix. - Not tested: The complete test suite could not run past collection because the local Windows environment lacks the compiled `headroom._core` extension. ## Review Readiness - [x] I have performed a self-review - [x] This PR is ready for human review ## Checklist - [x] My code follows the project's style guidelines - [x] I have performed a self-review of my code - [x] I have commented my code, particularly in hard-to-understand areas - [ ] Documentation changes are not required; `aclose()` is documented in its public docstring and the host owns shutdown sequencing - [x] My changes generate no new warnings - [x] I have added tests that prove my fix is effective or that my feature works - [ ] New and existing unit tests pass locally with my changes (full suite blocked by missing native extension; targeted tests pass) - [x] I did not edit `CHANGELOG.md` - it is generated by release-please from my Conventional Commit PR title. ## Screenshots (if applicable) Not applicable. ## Additional Notes The callback exposes `aclose()` for the host application's async shutdown lifecycle, matching the existing ASGI integration pattern. |
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