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## Description Pointing a litellm proxy at the Headroom callback blows up on the post-call success path: ``` type object 'HeadroomCallback' has no attribute 'async_post_call_success_hook' ``` litellm's logging contract calls `async_post_call_success_hook` after a successful response, and `HeadroomCallback` simply doesn't have it. We implement `async_pre_call_hook`, `async_success_handler` and `async_failure_handler`, but not this one, so litellm hits an `AttributeError` instead of a no-op and the whole request fails. This adds the missing `async_post_call_success_hook(self, data, user_api_key_dict, response)` matching litellm's signature. It returns `response` unchanged, the token accounting already lives in `async_success_handler` so there's nothing to do here except not crash. A few notes: 1. I did not make `HeadroomCallback` inherit litellm's `CustomLogger`, on purpose. The class keeps litellm as an optional dependency, so it stays a plain class and just provides the hooks litellm looks up by name. 2. It's a pass-through, so it's safe regardless of what the response contains. Closes #1114 ## 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 - `headroom/integrations/litellm_callback.py`: add `async_post_call_success_hook` to `HeadroomCallback`, returning the response unchanged; update the class docstring to list the full set of litellm hooks. - `tests/test_integrations/test_litellm_callback.py`: new tests that the method exists, is a coroutine, and returns the response untouched; build the module path with `pathlib` instead of a fragile `__file__.replace`. ## Testing - [x] Unit tests pass (`pytest`) - [x] Linting passes (`ruff check`) - [x] Type checking passes (`mypy headroom`) - [x] New tests added for new functionality - [ ] Manual testing performed ### Test Output ```text $ uv run --extra dev python -m pytest tests/test_integrations/test_litellm_callback.py -q 3 passed ruff: All checks passed! mypy: Success: no issues found ``` ## Real Behavior Proof - Environment: macOS, Python 3.13, this branch. - Exact command / steps: `uv run --extra dev python -m pytest tests/test_integrations/test_litellm_callback.py -q`. The tests import the callback module directly and resolve `async_post_call_success_hook` by name, the same way litellm does, then await it with a sentinel response. - Observed result: 3 passed. The hook exists, is a coroutine, and returns the exact response object it was given. Before the fix, resolving the attribute raised `AttributeError`. - Not tested: I did not stand up a full litellm proxy end to end. The fix is the missing hook method, which the unit tests cover. ## 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 - [ ] I have made corresponding changes to the documentation - [x] My changes generate no new warnings - [x] I have added tests that prove my fix is effective or that my feature works - [x] New and existing unit tests pass locally with my changes - [x] I have updated the CHANGELOG.md if applicable ## Additional Notes --------- Co-authored-by: JD Davis <mxjerrett@gmail.com> |
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