more logs

lib/backend.py

@@ -235,10 +235,14 @@ class Backend:
             log.debug("No healthcheck endpoint defined, skipping healthcheck")
             return
 
+        first_healthcheck = True
         while True:
             await sleep(10)
             if self.__start_healthcheck is False:
                 continue
+            if first_healthcheck:
+                log.info(f"[healthcheck] First healthcheck starting (model is now loaded)")
+                first_healthcheck = False
             try:
                 log.debug(f"Performing healthcheck on {health_check_url}")
                 async with self.healthcheck_session.get(health_check_url) as response:
@@ -256,9 +260,22 @@ class Backend:
                 self.backend_errored(str(e))
 
     async def _start_tracking(self) -> None:
-        await gather(
+        log.info("Starting tracking tasks (read_logs, send_metrics_loop, healthcheck, send_delete_requests_loop)")
-            self.__read_logs(), self.metrics._send_metrics_loop(), self.__healthcheck(), self.metrics._send_delete_requests_loop()
+        task_names = ["read_logs", "send_metrics_loop", "healthcheck", "send_delete_requests_loop"]
+        results = await gather(
+            self.__read_logs(), 
+            self.metrics._send_metrics_loop(), 
+            self.__healthcheck(), 
+            self.metrics._send_delete_requests_loop(),
+            return_exceptions=True
         )
+        # If we get here, one or more tasks exited (they should run forever)
+        log.error(f"CRITICAL: _start_tracking gather returned! This should never happen. Results: {results}")
+        for name, result in zip(task_names, results):
+            if isinstance(result, Exception):
+                log.error(f"Tracking task '{name}' crashed with exception: {result}", exc_info=result)
+            elif result is not None:
+                log.warning(f"Tracking task '{name}' exited unexpectedly with result: {result}")
 
     def backend_errored(self, msg: str) -> None:
         self.metrics._model_errored(msg)
@@ -399,15 +416,20 @@ class Backend:
                         # await sleep(5)
                         try:
                             max_throughput = await run_benchmark()
+                            log.info(f"[benchmark] Benchmark complete, max_throughput={max_throughput}, setting healthcheck=True")
                             self.__start_healthcheck = True
                             self.metrics._model_loaded(
                                 max_throughput=max_throughput,
                             )
+                            log.info(f"[benchmark] _model_loaded() called, returning from handle_log_line")
                         except ClientConnectorError as e:
                             log.debug(
-                                f"failed to connect to comfyui api during benchmark"
+                                f"failed to connect to model api during benchmark"
                             )
                             self.backend_errored(str(e))
+                        except Exception as e:
+                            log.error(f"Unexpected error during benchmark: {e}", exc_info=True)
+                            self.backend_errored(f"Benchmark failed: {e}")
                     case LogAction.ModelError if msg in log_line:
                         log.debug(f"Got log line indicating error: {log_line}")
                         self.backend_errored(msg)
@@ -419,10 +441,14 @@ class Backend:
             log.debug(f"tailing file: {self.model_log_file}")
             async with await open_file(self.model_log_file, encoding='utf-8', errors='ignore') as f:
                 while True:
-                    line = await f.readline()
+                    try:
-                    if line:
+                        line = await f.readline()
-                        await handle_log_line(line.rstrip())
+                        if line:
-                    else:
+                            await handle_log_line(line.rstrip())
+                        else:
+                            await asyncio.sleep(LOG_POLL_INTERVAL)
+                    except Exception as e:
+                        log.error(f"Error processing log line: {e}", exc_info=True)
                         await asyncio.sleep(LOG_POLL_INTERVAL)
 
         ###########

lib/metrics.py

@@ -1,4 +1,5 @@
 import os
+import sys
 import time
 import logging
 import json
@@ -17,6 +18,14 @@ DELETE_REQUESTS_INTERVAL = 1
 log = logging.getLogger(__file__)
 
 
+def _flush_logs():
+    """Force flush all log handlers and stdout/stderr."""
+    for handler in logging.root.handlers:
+        handler.flush()
+    sys.stdout.flush()
+    sys.stderr.flush()
+
+
 @cache
 def get_url() -> str:
     use_ssl = os.environ.get("USE_SSL", "false") == "true"
@@ -119,22 +128,41 @@ class Metrics:
                 await self.__send_delete_requests_and_reset()
 
     async def _send_metrics_loop(self) -> Awaitable[NoReturn]:
+        loop_count = 0
+        first_loaded_send_done = False
         while True:
             await sleep(METRICS_UPDATE_INTERVAL)
+            loop_count += 1
             elapsed = time.time() - self.last_metric_update
+            # Log heartbeat every 30 seconds to confirm loop is running
+            if loop_count % 30 == 0:
+                log.debug(f"[heartbeat] metrics loop alive, loop_count={loop_count}, model_loaded={self.system_metrics.model_is_loaded}")
+                _flush_logs()
+            # Extra logging for first few iterations after model loads
+            if self.system_metrics.model_is_loaded and not first_loaded_send_done:
+                log.info(f"[transition] First iteration with model_loaded=True, loop_count={loop_count}, elapsed={elapsed:.1f}")
+                _flush_logs()
             if self.system_metrics.model_is_loaded is False and elapsed >= 10:
                 log.debug(f"sending loading model metrics after {int(elapsed)}s wait")
                 await self.__send_metrics_and_reset()
             elif self.update_pending or elapsed > 10:
                 log.debug(f"sending loaded model metrics after {int(elapsed)}s wait")
                 await self.__send_metrics_and_reset()
+                if self.system_metrics.model_is_loaded and not first_loaded_send_done:
+                    first_loaded_send_done = True
+                    log.info(f"[transition] First loaded metrics send complete, continuing to next iteration...")
+                    _flush_logs()
 
     def _model_loaded(self, max_throughput: float) -> None:
+        log.info(f"MODEL LOADED: Setting model_is_loaded=True, max_throughput={max_throughput}")
+        _flush_logs()
         self.system_metrics.model_loading_time = (
             time.time() - self.system_metrics.model_loading_start
         )
         self.system_metrics.model_is_loaded = True
         self.model_metrics.max_throughput = max_throughput
+        log.info(f"MODEL LOADED: model_loading_time={self.system_metrics.model_loading_time}")
+        _flush_logs()
 
     def _model_errored(self, error_msg: str) -> None:
         self.model_metrics.set_errored(error_msg)
@@ -271,6 +299,7 @@ class Metrics:
         ###########
 
         self.system_metrics.update_disk_usage()
+        had_loadtime = loadtime_snapshot is not None and loadtime_snapshot > 0
 
         sent = False
         for report_addr in self.report_addr:
@@ -279,8 +308,14 @@ class Metrics:
                 break
 
         if sent:
+            if had_loadtime:
+                log.info(f"FIRST LOADTIME METRICS SENT SUCCESSFULLY! loadtime={loadtime_snapshot}")
+                _flush_logs()
             # clear the one-shot loadtime only if we actually sent *this* value
             self.system_metrics.reset(expected=loadtime_snapshot)
             self.update_pending = False
             self.model_metrics.reset()
             self.last_metric_update = time.time()
+            if had_loadtime:
+                log.info(f"POST-SEND: reset complete, last_metric_update={self.last_metric_update}, continuing loop...")
+                _flush_logs()

lib/server.py

@@ -1,40 +1,80 @@
 import os
 import logging
+import signal
+import sys
 from typing import List
 import ssl
 from asyncio import run, gather
-
+import asyncio
 
 from lib.backend import Backend
+from lib.metrics import Metrics
 from aiohttp import web
 
 log = logging.getLogger(__file__)
 
 
+def _setup_signal_handlers():
+    """Setup signal handlers to log when process receives termination signals."""
+    def signal_handler(signum, frame):
+        sig_name = signal.Signals(signum).name
+        log.error(f"SIGNAL RECEIVED: {sig_name} ({signum}) - process is being terminated")
+        sys.stdout.flush()
+        sys.stderr.flush()
+        sys.exit(128 + signum)
+    
+    # Handle common termination signals
+    for sig in [signal.SIGTERM, signal.SIGINT, signal.SIGHUP]:
+        try:
+            signal.signal(sig, signal_handler)
+        except (OSError, ValueError):
+            pass  # Some signals may not be available
+
+
 def start_server(backend: Backend, routes: List[web.RouteDef], **kwargs):
-    log.debug("getting certificate...")
+    _setup_signal_handlers()
-    use_ssl = os.environ.get("USE_SSL", "false") == "true"
+    try:
-    if use_ssl is True:
+        log.debug("getting certificate...")
-        ssl_context = ssl.create_default_context(ssl.Purpose.CLIENT_AUTH)
+        use_ssl = os.environ.get("USE_SSL", "false") == "true"
-        ssl_context.load_cert_chain(
+        if use_ssl is True:
-            certfile="/etc/instance.crt",
+            ssl_context = ssl.create_default_context(ssl.Purpose.CLIENT_AUTH)
-            keyfile="/etc/instance.key",
+            ssl_context.load_cert_chain(
-        )
+                certfile="/etc/instance.crt",
-    else:
+                keyfile="/etc/instance.key",
-        ssl_context = None
+            )
+        else:
+            ssl_context = None
 
-    async def main():
+        async def main():
-        log.debug("starting server...")
+            log.debug("starting server...")
-        app = web.Application()
+            app = web.Application()
-        app.add_routes(routes)
+            app.add_routes(routes)
-        runner = web.AppRunner(app)
+            runner = web.AppRunner(app)
-        await runner.setup()
+            await runner.setup()
-        site = web.TCPSite(
+            site = web.TCPSite(
-            runner,
+                runner,
-            ssl_context=ssl_context,
+                ssl_context=ssl_context,
-            port=int(os.environ["WORKER_PORT"]),
+                port=int(os.environ["WORKER_PORT"]),
-            **kwargs
+                **kwargs
-        )
+            )
-        await gather(site.start(), backend._start_tracking())
+            await gather(site.start(), backend._start_tracking())
 
-    run(main())
+        run(main())
+
+    except Exception as e:
+        err_msg = f"PyWorker failed to launch: {e}"
+        log.error(err_msg)
+
+        async def beacon():
+            metrics = Metrics()
+            metrics._set_version(getattr(backend, "version", "0"))
+            metrics._set_mtoken(getattr(backend, "mtoken", ""))
+            try:
+                while True:
+                    metrics._model_errored(err_msg)
+                    await metrics._Metrics__send_metrics_and_reset()
+                    await asyncio.sleep(10)
+            finally:
+                await metrics.aclose()
+
+        run(beacon())

start_server.sh

@@ -132,5 +132,43 @@ cd "$SERVER_DIR"
 
 echo "launching PyWorker server"
 
-(python3 -m "workers.$BACKEND.server" |& tee -a "$PYWORKER_LOG") &
+set +e
-echo "launching PyWorker server done"
+python3 -m "workers.$BACKEND.server" |& tee -a "$PYWORKER_LOG"
+PY_STATUS=${PIPESTATUS[0]}
+set -e
+
+if [ "${PY_STATUS}" -ne 0 ]; then
+  echo "PyWorker exited with status ${PY_STATUS}; notifying autoscaler..."
+  ERROR_MSG="PyWorker exited: code ${PY_STATUS}"
+  MTOKEN="${MASTER_TOKEN:-}"
+  VERSION="${PYWORKER_VERSION:-0}"
+
+  IFS=',' read -r -a REPORT_ADDRS <<< "${REPORT_ADDR}"
+  for addr in "${REPORT_ADDRS[@]}"; do
+    curl -sS -X POST -H 'Content-Type: application/json' \
+      -d "$(cat <<JSON
+{
+  "id": ${CONTAINER_ID:-0},
+  "mtoken": "${MTOKEN}",
+  "version": "${VERSION}",
+  "loadtime": 0,
+  "new_load": 0,
+  "cur_load": 0,
+  "rej_load": 0,
+  "max_perf": 0,
+  "cur_perf": 0,
+  "error_msg": "${ERROR_MSG}",
+  "num_requests_working": 0,
+  "num_requests_recieved": 0,
+  "additional_disk_usage": 0,
+  "working_request_idxs": [],
+  "cur_capacity": 0,
+  "max_capacity": 0,
+  "url": "${URL}"
+}
+JSON
+)" "${addr%/}/worker_status/" || true
+  done
+fi
+
+echo "launching PyWorker server done"