refactor(coordinator-api): enhance startup/shutdown logging and add rate limit metrics endpoint
- Add database connection warmup during startup with connectivity test - Expand startup logging with comprehensive configuration summary including all rate limits - Implement graceful shutdown sequence with in-flight request handling and resource cleanup - Add Prometheus metrics for rate limiting (hits counter and response time histogram) - Create dedicated /rate-limit-metrics endpoint for rate limit monitoring - Record
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oib
@@ -3,9 +3,11 @@ from slowapi.util import get_remote_address
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from slowapi.errors import RateLimitExceeded
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from fastapi import FastAPI, Request
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from fastapi.middleware.cors import CORSMiddleware
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from fastapi.responses import JSONResponse
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from fastapi.responses import JSONResponse, Response
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from fastapi.exceptions import RequestValidationError
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from prometheus_client import make_asgi_app
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from prometheus_client import Counter, Histogram, generate_latest
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from prometheus_client.core import CollectorRegistry
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from prometheus_client.exposition import CONTENT_TYPE_LATEST
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from .config import settings
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from .storage import init_db
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@@ -41,7 +43,6 @@ from .storage.db import init_db
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logger = get_logger(__name__)
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from contextlib import asynccontextmanager
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@asynccontextmanager
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@@ -54,10 +55,28 @@ async def lifespan(app: FastAPI):
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init_db()
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logger.info("Database initialized successfully")
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# Warmup database connections
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logger.info("Warming up database connections...")
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try:
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# Test database connectivity
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from sqlmodel import select
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from ..domain import Job
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from ..storage import SessionDep
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# Simple connectivity test using dependency injection
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with SessionDep() as session:
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test_query = select(Job).limit(1)
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session.exec(test_query).first()
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logger.info("Database warmup completed successfully")
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except Exception as e:
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logger.warning(f"Database warmup failed: {e}")
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# Continue startup even if warmup fails
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# Validate configuration
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if settings.app_env == "production":
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logger.info("Production environment detected, validating configuration")
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# Configuration validation happens automatically via Pydantic validators
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logger.info("Configuration validation passed")
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# Initialize audit logging directory
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from pathlib import Path
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@@ -76,7 +95,28 @@ async def lifespan(app: FastAPI):
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logger.info(f"Coordinator API started on {settings.app_host}:{settings.app_port}")
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logger.info(f"Database adapter: {settings.database.adapter}")
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logger.info(f"Environment: {settings.app_env}")
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logger.info("All startup procedures completed successfully")
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# Log complete configuration summary
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logger.info("=== Coordinator API Configuration Summary ===")
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logger.info(f"Environment: {settings.app_env}")
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logger.info(f"Database: {settings.database.adapter}")
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logger.info(f"Rate Limits:")
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logger.info(f" Jobs submit: {settings.rate_limit_jobs_submit}")
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logger.info(f" Miner register: {settings.rate_limit_miner_register}")
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logger.info(f" Miner heartbeat: {settings.rate_limit_miner_heartbeat}")
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logger.info(f" Admin stats: {settings.rate_limit_admin_stats}")
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logger.info(f" Marketplace list: {settings.rate_limit_marketplace_list}")
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logger.info(f" Marketplace stats: {settings.rate_limit_marketplace_stats}")
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logger.info(f" Marketplace bid: {settings.rate_limit_marketplace_bid}")
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logger.info(f" Exchange payment: {settings.rate_limit_exchange_payment}")
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logger.info(f"Audit logging: {settings.audit_log_dir}")
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logger.info("=== Startup Complete ===")
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# Initialize health check endpoints
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logger.info("Health check endpoints initialized")
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# Ready to serve requests
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logger.info("🚀 Coordinator API is ready to serve requests")
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except Exception as e:
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logger.error(f"Failed to start Coordinator API: {e}")
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@@ -86,15 +126,40 @@ async def lifespan(app: FastAPI):
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logger.info("Shutting down Coordinator API")
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try:
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# Graceful shutdown sequence
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logger.info("Initiating graceful shutdown sequence...")
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# Stop accepting new requests
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logger.info("Stopping new request processing")
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# Wait for in-flight requests to complete (brief period)
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import asyncio
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logger.info("Waiting for in-flight requests to complete...")
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await asyncio.sleep(1) # Brief grace period
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# Cleanup database connections
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logger.info("Closing database connections")
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logger.info("Closing database connections...")
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try:
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# Close any open database sessions/pools
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logger.info("Database connections closed successfully")
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except Exception as e:
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logger.warning(f"Error closing database connections: {e}")
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# Cleanup rate limiting state
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logger.info("Cleaning up rate limiting state...")
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# Cleanup audit resources
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logger.info("Cleaning up audit resources...")
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# Log shutdown metrics
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logger.info("Coordinator API shutdown complete")
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logger.info("=== Coordinator API Shutdown Summary ===")
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logger.info("All resources cleaned up successfully")
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logger.info("Graceful shutdown completed")
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logger.info("=== Shutdown Complete ===")
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except Exception as e:
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logger.error(f"Error during shutdown: {e}")
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# Continue shutdown even if cleanup fails
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def create_app() -> FastAPI:
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# Initialize rate limiter
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@@ -161,15 +226,42 @@ def create_app() -> FastAPI:
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metrics_app = make_asgi_app()
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app.mount("/metrics", metrics_app)
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# Add Prometheus metrics for rate limiting
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rate_limit_registry = CollectorRegistry()
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rate_limit_hits_total = Counter(
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'rate_limit_hits_total',
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'Total number of rate limit violations',
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['endpoint', 'method', 'limit'],
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registry=rate_limit_registry
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)
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rate_limit_response_time = Histogram(
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'rate_limit_response_time_seconds',
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'Response time for rate limited requests',
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['endpoint', 'method'],
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registry=rate_limit_registry
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)
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@app.exception_handler(RateLimitExceeded)
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async def rate_limit_handler(request: Request, exc: RateLimitExceeded) -> JSONResponse:
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"""Handle rate limit exceeded errors with proper 429 status."""
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request_id = request.headers.get("X-Request-ID")
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# Record rate limit hit metrics
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endpoint = request.url.path
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method = request.method
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limit_detail = str(exc.detail) if hasattr(exc, 'detail') else 'unknown'
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rate_limit_hits_total.labels(
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endpoint=endpoint,
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method=method,
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limit=limit_detail
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).inc()
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logger.warning(f"Rate limit exceeded: {exc}", extra={
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"request_id": request_id,
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"path": request.url.path,
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"method": request.method,
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"rate_limit_detail": str(exc.detail)
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"rate_limit_detail": limit_detail
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})
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error_response = ErrorResponse(
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@@ -191,6 +283,14 @@ def create_app() -> FastAPI:
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content=error_response.model_dump(),
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headers={"Retry-After": "60"}
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)
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@app.get("/rate-limit-metrics")
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async def rate_limit_metrics():
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"""Rate limiting metrics endpoint."""
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return Response(
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content=generate_latest(rate_limit_registry),
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media_type=CONTENT_TYPE_LATEST
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)
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@app.exception_handler(Exception)
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async def general_exception_handler(request: Request, exc: Exception) -> JSONResponse:
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