Files
litellm/tests/proxy_unit_tests
harish-berri 8f25942ecf Litellm key rotation bug (#27756)
* fix(proxy): resolve cache handling issues in _lookup_deprecated_key

- Updated the in-memory cache for deprecated key lookups to store a 3-tuple (active_token_id, cache_expires_at_ts, revoke_at_ts) instead of a 2-tuple, ensuring proper unpacking and backward compatibility.
- Removed duplicate cache reads and added logic to handle legacy cache entries gracefully.
- Enhanced unit tests to cover scenarios for cache hits, DB misses, and respect for revoke_at timestamps, ensuring robust handling of the grace-period key-rotation feature.

* refactor(proxy): streamline cache handling in _lookup_deprecated_key

- Simplified the cache retrieval logic by directly unpacking the 3-tuple cache entries, removing the need for backward compatibility checks for 2-tuple entries.
- Updated unit tests to ensure that pre-warmed 3-tuple cache entries are served correctly without unnecessary database lookups.

* chore(ci): add new unit test for deprecated key grace period

- Included `test_deprecated_key_grace_period.py` in the CI workflow to enhance coverage for deprecated key handling scenarios.

* fix(proxy): remove unnecessary check for revoke_at in _lookup_deprecated_key

- Eliminated the redundant check for None on revoke_at, streamlining the logic for handling deprecated keys in the cache. This change enhances the efficiency of the key lookup process.

* test(proxy): add end-to-end tests for deprecated key lookup behavior

- Introduced a new test class `TestDeprecatedKeyLookupDbE2E` to validate the behavior of deprecated key lookups against a real Prisma-backed database.
- The test ensures that old key hashes resolve correctly and that repeated lookups utilize the in-memory cache without errors.
- Cleaned up the `_lookup_deprecated_key` function by removing an unnecessary check for `revoke_at`, enhancing the efficiency of the key lookup process.
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