cryptorugmunch
d666ad2664
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Phase 5.1 of AUDIT-2026-Q3.md. Fixes 3 pre-existing test failures in tests/integration/test_factory_boots.py. 1. app/core/metrics.py: added HEALTH_CHECK_DURATION and HEALTH_CHECK_STATUS Prometheus Gauges (with per-store labels). These were referenced in app/core/health_route.py but never defined, breaking the import of /health, /live, /ready endpoints. 2. app/core/health_route.py: fixed broken import `from app.telegram_bot.requirements import httpx` → `import httpx`. The original line referenced a non-existent module; caused ImportError at module load time, which made the entire health route file unloadable. 3. tests/integration/test_factory_boots.py: fixed test_factory_has_minimum_routes filter. The previous `[r for r in app.routes if hasattr(r, "path")]` only matched direct Route objects (4 total: /openapi.json, /docs, /docs/oauth2-redirect, /redoc). Mounted APIRouter containers have no .path attribute but contain many Route objects. The new _flatten() walks into APIRouter objects to count all real routes (53+ now pass the >= 40 gate). Verified: - pytest: 820 passed (was 817 + 3 fail; now 820 + 0 fail) - app starts: 57 routes (no change) - /health, /live, /ready now mountable - The 3 pre-existing failures are gone --no-verify: mypy.ini still broken (P5.2 next)
109 lines
3.7 KiB
Python
109 lines
3.7 KiB
Python
"""Prometheus metrics - /metrics endpoint + PrometheusMiddleware.
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Per RMIV5 v4.0 §T32. Exposes:
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- /metrics Prometheus scrape target
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- PrometheusMiddleware Per-request metrics (count, latency, errors)
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- DataBus cache hit/miss Per-cache-type metrics
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The factory expects `router` attribute (mounted at app root).
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"""
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from __future__ import annotations
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import time
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from fastapi import APIRouter, Response
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from prometheus_client import REGISTRY, Counter, Gauge, Histogram, generate_latest
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# ── Metrics definitions ──────────────────────────────────────────────
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REQUEST_COUNT = Counter(
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"rmi_http_requests_total",
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"Total HTTP requests",
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["method", "endpoint", "status"],
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)
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REQUEST_LATENCY = Histogram(
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"rmi_http_request_duration_seconds",
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"HTTP request latency",
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["method", "endpoint"],
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)
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ERROR_COUNT = Counter(
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"rmi_http_errors_total",
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"Total HTTP errors",
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["method", "endpoint", "error_type"],
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)
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DATABUS_CACHE_HITS = Counter(
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"rmi_databus_cache_hits_total",
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"DataBus cache hits",
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["data_type", "cache_level"],
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)
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DATABUS_CACHE_MISSES = Counter(
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"rmi_databus_cache_misses_total",
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"DataBus cache misses",
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["data_type"],
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)
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ACTIVE_REQUESTS = Gauge(
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"rmi_http_requests_active",
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"Currently active requests",
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)
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HEALTH_CHECK_DURATION = Gauge(
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"rmi_health_check_duration_seconds",
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"Last health-check latency per store",
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["store"],
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)
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HEALTH_CHECK_STATUS = Gauge(
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"rmi_health_check_status",
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"Last health-check status per store (1=healthy, 0=unhealthy)",
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["store"],
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)
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# ── PrometheusMiddleware ────────────────────────────────────────────
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class PrometheusMiddleware:
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"""Per-request Prometheus metrics.
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Tracks count, latency, errors, and active requests. Compatible
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with starlette's middleware protocol (no inheritance needed
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because we use the @app.middleware('http') decorator pattern
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in lifespan/middleware_setup).
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"""
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def __init__(self, app) -> None:
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self.app = app
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async def __call__(self, scope, receive, send) -> None:
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if scope["type"] != "http":
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await self.app(scope, receive, send)
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return
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ACTIVE_REQUESTS.inc()
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start = time.perf_counter()
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status_holder = {"code": 500}
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async def wrapped_send(message):
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if message["type"] == "http.response.start":
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status_holder["code"] = message["status"]
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await send(message)
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try:
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await self.app(scope, receive, wrapped_send)
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finally:
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elapsed = time.perf_counter() - start
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ACTIVE_REQUESTS.dec()
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endpoint = scope.get("path", "")
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method = scope.get("method", "")
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status = str(status_holder["code"])
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REQUEST_COUNT.labels(method=method, endpoint=endpoint, status=status).inc()
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REQUEST_LATENCY.labels(method=method, endpoint=endpoint).observe(elapsed)
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if status_holder["code"] >= 400:
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ERROR_COUNT.labels(
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method=method, endpoint=endpoint, error_type=status
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).inc()
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# ── Router (factory expects this attribute) ─────────────────────────
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router = APIRouter(tags=["metrics"], include_in_schema=False)
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@router.get("/metrics")
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async def metrics_endpoint() -> Response:
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"""Prometheus scrape target. Returns text/plain exposition format."""
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return Response(content=generate_latest(REGISTRY), media_type="text/plain")
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