agentjido / req_llm / d9a1ccf682f70b62258ee8b4d5e5989f5e1bca41-PR-174

49%

main: 49%

Build Type

Pull #174

github

Committed by neilberkman

Commit Message

Add OAuth2 token caching for Google Vertex AI

OAuth2 token generation on every request adds 60-180ms overhead
(file I/O, JWT signing, HTTP round trip). Tokens are valid for 1 hour,
so this overhead is wasteful for repeated requests.

Implementation:
- GenServer + ETS cache storing tokens per service account
- 55 minute TTL (5 minute safety margin from 1 hour token lifetime)
- GenServer serializes refresh requests to prevent duplicate fetches
- Per-node cache (no distributed coordination needed)

Performance impact:
- Before: 1000 requests = 60-180 seconds auth overhead
- After: 1000 requests = 60-180ms auth overhead (first request only)
- Improvement: 99.9% reduction in auth overhead

Pull Request Pull Request #174: Add OAuth2 token caching for Google Vertex AI

Run Details

15 of 26 new or added lines in 2 files covered. (57.69%)

4 existing lines in 2 files now uncovered.

3960 of 7529 relevant lines covered (52.6%)

354.08 hits per line