Add bulkhead concurrency isolation and rate-limit header parsing#282
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resilience recovers and rate_limit paces, but nothing capped simultaneous in-flight calls (a slow dependency could exhaust every worker) and the HTTP client ignored Retry-After/RateLimit-* headers. Add a bulkhead (bounded-concurrency permit that sheds load when full) and parsers for the server-advised delay (delta-seconds or HTTP-date). Non-blocking permit counting is deterministic. Wired through the facade, AC_bulkhead_run/ AC_retry_after executor commands, MCP tools and the Script Builder.
Up to standards ✅🟢 Issues
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| Metric | Results |
|---|---|
| Complexity | 47 |
| Duplication | 0 |
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Summary
resiliencerecovers from failures andrate_limitpaces calls, but nothing capped the number of simultaneous in-flight calls to one resource (a slow dependency could exhaust every worker), and the HTTP client readRetry-After/RateLimit-*headers but honored none of them. This adds both.Bulkhead(max_concurrent, name=)—try_enter/release, context manager,run(func); rejects withBulkheadFullErrorwhen full (load-shedding / fault isolation). Non-blocking permit counting → deterministic, no threads in tests.parse_retry_after(headers)— delta-seconds or HTTP-date;parse_ratelimit(headers)—RateLimit-Limit/Remaining/Reset;next_delay(response)— the wait a flow should observe after 429/503.Pure stdlib (
threading+email.utils).Five-layer wiring
je_auto_control/utils/bulkhead/__init__.py+__all__AC_bulkhead_run(named bulkhead wraps an action list),AC_retry_afterac_bulkhead_run,ac_retry_afterTests & docs
test/unit_test/headless/test_bulkhead_batch.py(9 tests: permit/reject, context manager, run, bad max, Retry-After delta/date/case, RateLimit parse, next_delay sources)Lint clean: ruff / pylint / bandit / radon.