refactor, handle zombie tasks

Bump pyworker version

lib/backend.py

@@ -9,6 +9,7 @@ from asyncio import wait, sleep, gather, Semaphore, FIRST_COMPLETED, create_task
 from typing import Tuple, Awaitable, NoReturn, List, Union, Callable, Optional
 from functools import cached_property
 from distutils.util import strtobool
+from collections import deque
 
 from anyio import open_file
 from aiohttp import web, ClientResponse, ClientSession, ClientConnectorError, ClientTimeout, TCPConnector
@@ -30,7 +31,7 @@ from lib.data_types import (
     BenchmarkResult
 )
 
-VERSION = "0.1.0"
+VERSION = "0.2.1"
 
 MSG_HISTORY_LEN = 100
 log = logging.getLogger(__file__)
@@ -63,16 +64,21 @@ class Backend:
     version = VERSION
     msg_history = []
     sem: Semaphore = dataclasses.field(default_factory=Semaphore)
+    queue: deque = dataclasses.field(default_factory=deque, repr=False)
     unsecured: bool = dataclasses.field(
         default_factory=lambda: bool(strtobool(os.environ.get("UNSECURED", "false"))),
     )
     report_addr: str = dataclasses.field(
         default_factory=lambda: os.environ.get("REPORT_ADDR", "https://run.vast.ai")
     )
+    mtoken: str = dataclasses.field(
+        default_factory=lambda: os.environ.get("MASTER_TOKEN", "")
+    )
 
     def __post_init__(self):
         self.metrics = Metrics()
         self.metrics._set_version(self.version)
+        self.metrics._set_mtoken(self.mtoken)
         self._total_pubkey_fetch_errors = 0
         self._pubkey = self._fetch_pubkey()
         self.__start_healthcheck: bool = False
@@ -137,11 +143,26 @@ class Backend:
         workload = payload.count_workload()
         request_metrics: RequestMetrics = RequestMetrics(request_idx=auth_data.request_idx, reqnum=auth_data.reqnum, workload=workload, status="Created")
 
-        async def cancel_api_call_if_disconnected() -> web.Response:
+
+        def advance_queue_after_completion(event: asyncio.Event):
+            """Pop current head and wake next waiter, if any."""
+            # If this event is current head, wake next waiter
+            if self.queue and self.queue[0] is event:
+                self.queue.popleft()
+                if self.queue:
+                    self.queue[0].set()
+            else:
+                # Else, remove it from the queue
+                try:
+                    self.queue.remove(event)
+                except ValueError:
+                    pass
+
+        async def cancel_api_call_if_disconnected() -> None:
             await request.wait_for_disconnection()
-            log.debug(f"request with reqnum: {request_metrics.reqnum} was canceled")
+            log.debug(f"Request with reqnum: {request_metrics.reqnum} was canceled")
             self.metrics._request_canceled(request_metrics)
-            raise asyncio.CancelledError
+            return
 
         async def make_request() -> Union[web.Response, web.StreamResponse]:
             try:
@@ -158,7 +179,9 @@ class Backend:
                 res = await handler.generate_client_response(request, response)
                 self.metrics._request_success(request_metrics)
                 return res
-            except requests.exceptions.RequestException as e:
+            except asyncio.CancelledError:
+                raise
+            except Exception as e:
                 log.debug(f"[backend] Request error: {e}")
                 self.metrics._request_errored(request_metrics)
                 return web.Response(status=500)
@@ -173,46 +196,87 @@ class Backend:
             self.metrics._request_reject(request_metrics)
             return web.Response(status=429)
 
-        acquired = False
+        disconnect_task = create_task(cancel_api_call_if_disconnected())
-        try:
+        next_request_task = None
-            self.metrics._request_start(request_metrics)
+        work_task = None
-            if self.allow_parallel_requests is False:
+        event = asyncio.Event() # Used in finally block, so initialize here
-                log.debug(f"Waiting to aquire Sem for reqnum:{request_metrics.reqnum}")
+
-                await self.sem.acquire()
+        self.metrics._request_start(request_metrics)
-                acquired = True
+
-                log.debug(
+        try:
-                    f"Sem acquired for reqnum:{request_metrics.reqnum}, starting request..."
+            if self.allow_parallel_requests:
-                )
+                log.debug(f"Starting request for reqnum:{request_metrics.reqnum}")
-            else:
+                work_task = create_task(make_request())
-                log.debug(f"Starting request for reqnum:{request_metrics.reqnum}")
+                done, pending = await wait([work_task, disconnect_task], return_when=FIRST_COMPLETED)
-            done, pending = await wait(
+
-                [
+                for t in pending:
-                    create_task(make_request()),
+                    t.cancel()
-                    create_task(cancel_api_call_if_disconnected()),
+                await asyncio.gather(*pending, return_exceptions=True)
-                ],
+
-                return_when=FIRST_COMPLETED,
+                if disconnect_task in done:
-            )
+                    return web.Response(status=499)
-            for t in pending:
+
-                t.cancel()
+                # otherwise work_task completed
-            await asyncio.gather(*pending, return_exceptions=True)
+                return await work_task
+            
+            # FIFO-queue branch
+            else:
+                # Insert a Event into the queue for this request
+                # Event.set() == our request is up next
+                self.queue.append(event)
+                if self.queue and self.queue[0] is event:
+                    event.set()
+
+                # Race between our request being next and request being cancelled
+                next_request_task = create_task(event.wait())
+                first_done, first_pending = await wait(
+                    [next_request_task, disconnect_task], return_when=FIRST_COMPLETED
+                )
+
+                # If the disconnect task wins the race
+                if disconnect_task in first_done:
+                    # Clean up the next_request_task, then exit
+                    for t in first_pending:
+                        t.cancel()
+                    await asyncio.gather(*first_pending, return_exceptions=True)
+                    return web.Response(status=499)
+
+                # We are the next-up request in the queue
+                log.debug(f"Starting work on request {request_metrics.reqnum}...")
+
+                # Race the backend API call with the disconnect task
+                work_task = create_task(make_request())
+
+                done, pending = await wait([work_task, disconnect_task], return_when=FIRST_COMPLETED)
+                for t in pending:
+                    t.cancel()
+                await asyncio.gather(*pending, return_exceptions=True)
+
+                if disconnect_task in done:
+                    return web.Response(status=499)
+
+                # otherwise work_task completed
+                return await work_task
             
-            done_task = done.pop()
-            try:
-                return done_task.result()
-            except Exception as e:
-                log.debug(f"Request task raised exception: {e}")
-                return web.Response(status=500)
         except asyncio.CancelledError:
-            # Client is gone. Do not write a response; just unwind.
             return web.Response(status=499)
+        
         except Exception as e:
             log.debug(f"Exception in main handler loop {e}")
             return web.Response(status=500)
+        
         finally:
-            # Always release the semaphore if it was acquired
+            if not self.allow_parallel_requests:
-            if acquired:
+                advance_queue_after_completion(event)
-                self.sem.release()
+
             self.metrics._request_end(request_metrics)
+            cleanup_tasks = [t for t in (next_request_task, work_task, disconnect_task) if t]
+            for t in cleanup_tasks:
+                if not t.done():
+                    t.cancel()
+            if cleanup_tasks:
+                await asyncio.gather(*cleanup_tasks, return_exceptions=True)
+
 
     @cached_property  
     def healthcheck_session(self):
@@ -314,10 +378,10 @@ class Backend:
                 with open(BENCHMARK_INDICATOR_FILE, "r") as f:
                     log.debug("already ran benchmark")
                     # trigger model load
-                    payload = self.benchmark_handler.make_benchmark_payload()
+                    # payload = self.benchmark_handler.make_benchmark_payload()
-                    _ = await self.__call_api(
+                    # _ = await self.__call_api(
-                        handler=self.benchmark_handler, payload=payload
+                    #     handler=self.benchmark_handler, payload=payload
-                    )
+                    # )
                     return float(f.readline())
             except FileNotFoundError:
                 pass
@@ -392,7 +456,7 @@ class Backend:
                         )
                         # some backends need a few seconds after logging successful startup before
                         # they can begin accepting requests
-                        await sleep(5)
+                        # await sleep(5)
                         try:
                             max_throughput = await run_benchmark()
                             self.__start_healthcheck = True

lib/data_types.py

@@ -286,6 +286,7 @@ class AutoScalerData:
     """Data that is reported to autoscaler"""
 
     id: int
+    mtoken: str
     version: str
     loadtime: float
     cur_load: float

lib/metrics.py

@@ -28,6 +28,7 @@ def get_url() -> str:
 @dataclass
 class Metrics:
     version: str = "0"
+    mtoken: str = ""
     last_metric_update: float = 0.0
     last_request_served: float = 0.0
     update_pending: bool = False
@@ -142,12 +143,16 @@ class Metrics:
     def _set_version(self, version: str) -> None:
         self.version = version
 
+    def _set_mtoken(self, mtoken: str) -> None:
+        self.mtoken = mtoken
+
     #######################################Private#######################################
 
     async def __send_delete_requests_and_reset(self):
         async def post(report_addr: str, idxs: list[int], success_flag: bool) -> bool:
             data = {
                 "worker_id": self.id,
+                "mtoken": self.mtoken,
                 "request_idxs": idxs,
                 "success": success_flag,
             }
@@ -209,6 +214,7 @@ class Metrics:
         def compute_autoscaler_data() -> AutoScalerData:
             return AutoScalerData(
                 id=self.id,
+                mtoken=self.mtoken,
                 version=self.version,
                 loadtime=(loadtime_snapshot or 0.0), 
                 new_load=self.model_metrics.workload_processing,
@@ -228,17 +234,25 @@ class Metrics:
 
         async def send_data(report_addr: str) -> bool:
             data = compute_autoscaler_data()
-            full_path = report_addr.rstrip("/") + "/worker_status/"
+            log_data = asdict(data)
+            def obfuscate(secret: str) -> str:
+                if secret is None:
+                    return ""
+                return secret[:7] + "..." if len(secret) > 7 else ("*" * len(secret))
+            
+            log_data["mtoken"] = obfuscate(log_data.get("mtoken"))
             log.debug(
                 "\n".join(
                     [
                         "#" * 60,
                         f"sending data to autoscaler",
-                        f"{json.dumps((asdict(data)), indent=2)}",
+                        f"{json.dumps(log_data, indent=2)}",
                         "#" * 60,
                     ]
                 )
             )
+
+            full_path = report_addr.rstrip("/") + "/worker_status/"
             for attempt in range(1, 4):
                 try:
                     session = await self.http()

start_server.sh

@@ -9,7 +9,7 @@ ENV_PATH="$WORKSPACE_DIR/worker-env"
 DEBUG_LOG="$WORKSPACE_DIR/debug.log"
 PYWORKER_LOG="$WORKSPACE_DIR/pyworker.log"
 
-REPORT_ADDR="${REPORT_ADDR:-https://cloud.vast.ai/api/v0,https://run.vast.ai}"
+REPORT_ADDR="${REPORT_ADDR:-https://run.vast.ai}"
 USE_SSL="${USE_SSL:-true}"
 WORKER_PORT="${WORKER_PORT:-3000}"
 mkdir -p "$WORKSPACE_DIR"

workers/comfyui-json/client.py

@@ -98,6 +98,7 @@ def call_text2image_workflow(
         endpoint=route_response["endpoint"],
         reqnum=route_response["reqnum"],
         url=route_response["url"],
+        request_idx=route_response["request_idx"],
     )
     
     # Build the payload for the worker request

workers/comfyui/client.py

@@ -82,6 +82,7 @@ def call_custom_workflow_for_sd3(
         endpoint=message["endpoint"],
         reqnum=message["reqnum"],
         url=message["url"],
+        request_idx=message["request_idx"],
     )
     workflow = {
         "3": {