Minor updates

common/request_logging.py

@@ -0,0 +1,135 @@
+from __future__ import annotations
+
+import ctypes
+import os
+import time
+from typing import Callable
+
+from fastapi import FastAPI, Request
+
+
+class _ProcessMemoryCounters(ctypes.Structure):
+    _fields_ = [
+        ("cb", ctypes.c_ulong),
+        ("PageFaultCount", ctypes.c_ulong),
+        ("PeakWorkingSetSize", ctypes.c_size_t),
+        ("WorkingSetSize", ctypes.c_size_t),
+        ("QuotaPeakPagedPoolUsage", ctypes.c_size_t),
+        ("QuotaPagedPoolUsage", ctypes.c_size_t),
+        ("QuotaPeakNonPagedPoolUsage", ctypes.c_size_t),
+        ("QuotaNonPagedPoolUsage", ctypes.c_size_t),
+        ("PagefileUsage", ctypes.c_size_t),
+        ("PeakPagefileUsage", ctypes.c_size_t),
+    ]
+
+
+def _get_process_cpu_seconds() -> float:
+    cpu_times = os.times()
+    return cpu_times.user + cpu_times.system
+
+
+def _get_process_rss_bytes() -> int | None:
+    if os.name == "nt":
+        try:
+            kernel32 = ctypes.WinDLL("kernel32", use_last_error=True)
+            psapi = ctypes.WinDLL("psapi", use_last_error=True)
+            kernel32.GetCurrentProcess.restype = ctypes.c_void_p
+            psapi.GetProcessMemoryInfo.argtypes = [ctypes.c_void_p, ctypes.c_void_p, ctypes.c_ulong]
+            psapi.GetProcessMemoryInfo.restype = ctypes.c_int
+
+            counters = _ProcessMemoryCounters()
+            counters.cb = ctypes.sizeof(_ProcessMemoryCounters)
+            ok = psapi.GetProcessMemoryInfo(
+                kernel32.GetCurrentProcess(),
+                ctypes.byref(counters),
+                counters.cb,
+            )
+            if ok:
+                return int(counters.WorkingSetSize)
+        except Exception:
+            return None
+        return None
+
+    try:
+        with open("/proc/self/statm", "r", encoding="ascii") as handle:
+            resident_pages = int(handle.read().split()[1])
+        return resident_pages * os.sysconf("SC_PAGE_SIZE")
+    except Exception:
+        return None
+
+
+def _format_megabytes(value: int | None) -> str:
+    if value is None:
+        return "unknown"
+    return f"{value / (1024 * 1024):.1f}"
+
+
+def _format_megabyte_delta(start: int | None, end: int | None) -> str:
+    if start is None or end is None:
+        return "unknown"
+    return f"{(end - start) / (1024 * 1024):.1f}"
+
+
+def _get_caller(request: Request) -> str:
+    forwarded_for = request.headers.get("x-forwarded-for")
+    if forwarded_for:
+        return forwarded_for.split(",", 1)[0].strip()
+    if request.client is not None:
+        return request.client.host
+    return "unknown"
+
+
+def install_request_logging(app: FastAPI, logger, service_name: str) -> None:
+    @app.middleware("http")
+    async def log_request(request: Request, call_next: Callable):
+        started_at = time.perf_counter()
+        cpu_started = _get_process_cpu_seconds()
+        rss_started = _get_process_rss_bytes()
+        caller = _get_caller(request)
+        forwarded_for = request.headers.get("x-forwarded-for", "-")
+        user_agent = request.headers.get("user-agent", "-")
+        request_id = request.headers.get("x-request-id") or request.headers.get("x-correlation-id") or "-"
+        content_length = request.headers.get("content-length", "0")
+        error_type = "-"
+        status_code = 500
+
+        logger.info(
+            "incoming_request service=%s caller=%s forwarded_for=%s method=%s path=%s query=%s user_agent=%r request_id=%s content_length=%s",
+            service_name,
+            caller,
+            forwarded_for,
+            request.method,
+            request.url.path,
+            request.url.query or "-",
+            user_agent,
+            request_id,
+            content_length,
+        )
+
+        try:
+            response = await call_next(request)
+            status_code = response.status_code
+            return response
+        except Exception as exc:
+            error_type = type(exc).__name__
+            raise
+        finally:
+            elapsed_ms = (time.perf_counter() - started_at) * 1000
+            cpu_time_ms = max(0.0, (_get_process_cpu_seconds() - cpu_started) * 1000)
+            cpu_percent = 0.0 if elapsed_ms <= 0 else (cpu_time_ms / elapsed_ms) * 100
+            rss_finished = _get_process_rss_bytes()
+            logger.info(
+                "completed_request service=%s caller=%s method=%s path=%s status_code=%s response_time_ms=%.1f cpu_time_ms=%.1f cpu_percent=%.1f rss_mb=%s rss_delta_mb=%s request_id=%s error_type=%s",
+                service_name,
+                caller,
+                request.method,
+                request.url.path,
+                status_code,
+                elapsed_ms,
+                cpu_time_ms,
+                cpu_percent,
+                _format_megabytes(rss_finished),
+                _format_megabyte_delta(rss_started, rss_finished),
+                request_id,
+                error_type,
+            )

gateway/main.py

@@ -14,6 +14,8 @@ from fastapi.responses import JSONResponse, Response
 from starlette.middleware.base import BaseHTTPMiddleware
 from pydantic import BaseModel, Field, ValidationError, field_validator
 
+from common.request_logging import install_request_logging
+
 logger = logging.getLogger("gateway")
 logging.basicConfig(level=logging.INFO, format="%(asctime)s %(levelname)s %(name)s %(message)s")
 
@@ -142,6 +144,7 @@ def _is_llm_path(path: str) -> bool:
 
 app = FastAPI(title="Skinbase Vision Gateway", version="1.0.0", lifespan=lifespan)
 app.add_middleware(APIKeyMiddleware)
+install_request_logging(app, logger, "gateway")
 
 
 @app.exception_handler(LLMGatewayError)

llm/main.py

@@ -14,6 +14,8 @@ import httpx
 from fastapi import FastAPI, HTTPException, Request
 from fastapi.responses import JSONResponse
 
+from common.request_logging import install_request_logging
+
 logger = logging.getLogger("llm")
 logging.basicConfig(level=logging.INFO, format="%(asctime)s %(levelname)s %(name)s %(message)s")
 
@@ -135,6 +137,7 @@ async def lifespan(app: FastAPI):
 
 
 app = FastAPI(title="Skinbase LLM Service", version="1.0.0", lifespan=lifespan)
+install_request_logging(app, logger, "llm")
 
 
 def _health_payload(status: str) -> Dict[str, Any]:

tests/test_gateway_llm.py

@@ -85,15 +85,27 @@ class GatewayLLMTests(unittest.IsolatedAsyncioTestCase):
     async def test_llm_endpoint_requires_api_key(self):
         module = load_gateway_module(llm_enabled=True)
 
-        response = await self._request(
+        with self.assertLogs("gateway", level="INFO") as captured:
-            module,
+            response = await self._request(
-            "POST",
+                module,
-            "/ai/chat",
+                "POST",
-            json_payload={"messages": [{"role": "user", "content": "hello"}]},
+                "/ai/chat",
-        )
+                json_payload={"messages": [{"role": "user", "content": "hello"}]},
+            )
 
         self.assertEqual(response.status_code, 401)
         self.assertEqual(response.json()["error"]["code"], "unauthorized")
+        joined_logs = "\n".join(captured.output)
+        self.assertIn("incoming_request service=gateway", joined_logs)
+        self.assertIn("completed_request service=gateway", joined_logs)
+        self.assertIn("caller=127.0.0.1", joined_logs)
+        self.assertIn("method=POST", joined_logs)
+        self.assertIn("path=/ai/chat", joined_logs)
+        self.assertIn("status_code=401", joined_logs)
+        self.assertIn("response_time_ms=", joined_logs)
+        self.assertIn("cpu_time_ms=", joined_logs)
+        self.assertIn("cpu_percent=", joined_logs)
+        self.assertIn("rss_mb=", joined_logs)
 
     async def test_llm_disabled_returns_503(self):
         module = load_gateway_module(llm_enabled=False)

tests/test_llm_service.py

@@ -44,8 +44,9 @@ class LLMServiceTests(unittest.IsolatedAsyncioTestCase):
         )
 
         transport = httpx.ASGITransport(app=module.app)
-        async with httpx.AsyncClient(transport=transport, base_url="http://testserver") as client:
+        with self.assertLogs("llm", level="INFO") as captured:
-            response = await client.get("/health")
+            async with httpx.AsyncClient(transport=transport, base_url="http://testserver") as client:
+                response = await client.get("/health")
 
         self.assertEqual(response.status_code, 200)
         self.assertEqual(
@@ -59,6 +60,17 @@ class LLMServiceTests(unittest.IsolatedAsyncioTestCase):
                 "gpu_layers": 0,
             },
         )
+        joined_logs = "\n".join(captured.output)
+        self.assertIn("incoming_request service=llm", joined_logs)
+        self.assertIn("completed_request service=llm", joined_logs)
+        self.assertIn("caller=127.0.0.1", joined_logs)
+        self.assertIn("method=GET", joined_logs)
+        self.assertIn("path=/health", joined_logs)
+        self.assertIn("status_code=200", joined_logs)
+        self.assertIn("response_time_ms=", joined_logs)
+        self.assertIn("cpu_time_ms=", joined_logs)
+        self.assertIn("cpu_percent=", joined_logs)
+        self.assertIn("rss_mb=", joined_logs)
 
     async def test_health_reports_unavailable_when_process_is_down(self):
         module = load_llm_module()