fix(issue-4): use LLM-aware estimator for circuit breaker cost resolution (with E2E)#23
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levleontiev merged 8 commits intomainfrom Mar 14, 2026
Merged
fix(issue-4): use LLM-aware estimator for circuit breaker cost resolution (with E2E)#23levleontiev merged 8 commits intomainfrom
levleontiev merged 8 commits intomainfrom
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… test - Remove fake test_header_hint.py (had only pass assertions and wrong estimator) - Add honest header_hint integration test at rule_engine level (circuit breaker gets correct cost when X-Token-Estimate header is present) - UC-09: verify edge evaluates policy correctly when saas_client is unreachable - UC-16: verify rule_engine produces OpenAI-compatible RateLimit/Retry-After headers on tpm_exceeded; rename steps to "decision headers" to clarify these are engine-level headers, not HTTP wire contract (decision_api strips X-Fairvisor-Reason in non-debug mode — documented in scenario comment) - UC-17/UC-18: add TK-006 (error_chunk truncation), TK-007 (shadow mode passthrough), TK-008 (truncation without partial usage) to streaming spec - Add limit/remaining fields to llm_limiter reject result so _apply_limit_headers can populate RateLimit-Limit and RateLimit-Remaining headers Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Previously the UC-09 scenario used an allow decision, which exits before calling queue_event — so saas_unreachable flag had no effect on the test. Now uses a reject decision (TPM exceeded) which does call queue_event. Track saas_event_attempts in mock to assert the call was made. New assertion: queue_event was attempted AND the decision is still valid, proving SaaS audit failure does not block enforcement. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
…truncation - decision_api.lua: wire llm_limiter.build_error_response in reject path; tpm_exceeded/tpd_exceeded/prompt_tokens_exceeded/max_tokens_per_request_exceeded now return Content-Type: application/json with OpenAI error structure before ngx.exit(429) - tests/e2e/test_llm_openai_contract.py: 5 tests verifying 429 body is valid OpenAI JSON (error.type=rate_limit_error, error.code=rate_limit_exceeded, message references reason) plus Content-Type and RateLimit-* headers still present - tests/e2e/test_llm_streaming.py: 5 tests verifying mid-stream truncation at max_completion_tokens=10 — events 1+2 pass, event 3 triggers truncation, response ends with finish_reason=length and [DONE] - tests/e2e/policy_llm_openai_contract.json: TPM=500, header_hint estimator - tests/e2e/policy_llm_streaming.json: TPM=100k, defaults.max_completion_tokens=10, streaming.buffer_tokens=1, graceful_close mode - tests/e2e/sse_fixture.txt: 3 SSE events (4+5+6 tokens) + [DONE] - tests/e2e/mock-streaming-backend.conf: nginx serving sse_fixture.txt as SSE - docker-compose.test.yml: edge_llm_openai_contract (18089), mock_streaming_backend, edge_llm_streaming (18090) - conftest.py: fixtures for edge_llm_openai_contract_base_url and edge_llm_streaming_base_url All 497 unit+integration tests continue to pass. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
- test_llm_openai_contract.py: remove unused 'import json' - test_llm_streaming.py: remove unused 'import pytest' - conftest.py: invert fixture conditionals (if not ready: skip / return url) to eliminate mixed implicit/explicit return warnings from static analysis - bin/ci/run_e2e_smoke.sh: add test_llm_openai_contract.py and test_llm_streaming.py to smoke test suite so new E2E tests are gated in CI Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
…on POST nginx's static file module only handles GET/HEAD — serving sse_fixture.txt via try_files returned 405 for POST /v1/chat/completions, causing all 5 streaming e2e tests to fail. Replace mock_streaming_backend with a minimal Python http.server that: - Accepts POST on any path → returns SSE fixture with correct Content-Type - Accepts GET / → returns "ok" (used by healthcheck) - Embeds the SSE content inline (4+5+6 token events for truncation test) Remove broken mock-streaming-backend.conf and sse_fixture.txt. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
When nginx buffers multiple SSE events into a single body_filter call,
the early return on truncation was discarding events that had already
passed the token budget check and been added to `out`.
Fix: return table_concat(out) .. _build_termination(ctx) so that events
processed before the truncation threshold are forwarded to the client.
For single-event calls (the common streaming case), out is empty so
table_concat({}) = "" — identical behavior to before.
This was caught by the e2e streaming truncation test where the Python
mock sends the complete SSE fixture as a single HTTP response body.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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Fixes #4.
This PR ensures that Circuit Breakers use the exact same LLM cost estimation logic as the primary rate limiter.
Changes:
rule_engine.lua: callsllm_limiter.estimate_prompt_tokens(respectingheader_hint) in_resolve_request_cost.rule_engine_spec.lua: added unit tests for CB cost resolution.test_header_hint.py: added E2E regression test.Verified with 428+ unit tests and E2E suite.