Claude Code: Add request logging middleware and STARTUP_MODE support

- Add middleware to log all requests and exceptions to logs/runtime.log
- Create logs/ directory automatically if it doesn't exist
- Pass STARTUP_MODE from entrypoint.sh (default: minimal)

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

app.py

@@ -1,11 +1,59 @@
+import os
+import logging
 from fastapi import FastAPI, Request
 from datetime import datetime
 from fastapi.responses import JSONResponse
 from pydantic import BaseModel
 from typing import Optional
+from fastapi.responses import PlainTextResponse
+from fastapi.exceptions import RequestValidationError
+from starlette.exceptions import HTTPException as StarletteHTTPException
+
+# Ensure logs directory exists
+os.makedirs("logs", exist_ok=True)
+
+# Configure logging
+logging.basicConfig(
+    level=logging.INFO,
+    format='%(asctime)s - %(levelname)s - %(message)s',
+    handlers=[
+        logging.FileHandler('logs/runtime.log'),
+        logging.StreamHandler()
+    ]
+)
+logger = logging.getLogger(__name__)
+
+STARTUP_MODE = os.environ.get("STARTUP_MODE", "minimal")
 
 app = FastAPI()
 
+
+@app.middleware("http")
+async def log_requests(request: Request, call_next):
+    """Log all incoming requests and responses."""
+    start_time = datetime.utcnow()
+    logger.info(f"Request: {request.method} {request.url.path}")
+
+    try:
+        response = await call_next(request)
+        duration = (datetime.utcnow() - start_time).total_seconds()
+        logger.info(f"Response: {response.status_code} - {duration:.3f}s")
+        return response
+    except Exception as e:
+        duration = (datetime.utcnow() - start_time).total_seconds()
+        logger.error(f"Request failed after {duration:.3f}s: {str(e)}")
+        raise
+
+
+@app.exception_handler(Exception)
+async def global_exception_handler(request: Request, exc: Exception):
+    """Log all unhandled exceptions."""
+    logger.error(f"Unhandled exception on {request.url.path}: {type(exc).__name__}: {str(exc)}")
+    return JSONResponse(
+        status_code=500,
+        content={"error": "Internal server error", "detail": str(exc)}
+    )
+
 # In-memory worker state tracking
 _worker_state = {
     "worker_pid": None,

entrypoint.sh

@@ -1,2 +1,3 @@
 #!/bin/bash
+export STARTUP_MODE="${STARTUP_MODE:-minimal}"
 exec uvicorn app:app --host 0.0.0.0 --port 7860