trying queue

lib/backend.py

@@ -5,7 +5,7 @@ import base64
 import subprocess
 import dataclasses
 import logging
-from asyncio import wait, sleep, gather, Semaphore, FIRST_COMPLETED, create_task
+from asyncio import wait, sleep, gather, Semaphore, FIRST_COMPLETED, create_task, get_running_loop
 from typing import Tuple, Awaitable, NoReturn, List, Union, Callable, Optional
 from functools import cached_property
 from distutils.util import strtobool
@@ -47,7 +47,7 @@ class Backend:
     This class is responsible for:
     1. Tailing logs and updating load time metrics
     2. Taking an EndpointHandler alongside incoming payload, preparing a json to be sent to the model, and
-    sending the request. It also updates metrics as it makes those requests.
+       sending the request. It also updates metrics as it makes those requests.
     3. Running a benchmark from an EndpointHandler
     """
 
@@ -66,9 +66,6 @@ class Backend:
     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")
-    )
 
     def __post_init__(self):
         self.metrics = Metrics()
@@ -77,6 +74,11 @@ class Backend:
         self._pubkey = self._fetch_pubkey()
         self.__start_healthcheck: bool = False
 
+        # NEW: FIFO queue + worker count
+        self.request_queue: "asyncio.Queue[tuple[EndpointHandler[ApiPayload_T], web.Request, asyncio.Future]]" = asyncio.Queue()
+        # If parallel allowed, let multiple workers drain the queue (order preserved by FIFO per worker; overall start order is FIFO).
+        self._num_workers: int = 1 if not self.allow_parallel_requests else int(os.environ.get("WORKERS", "4"))
+
     @property
     def pubkey(self) -> Optional[RSA.RsaKey]:
         if self._pubkey is None:
@@ -94,6 +96,22 @@ class Backend:
         timeout = ClientTimeout(total=None)
         return ClientSession(self.model_server_url, timeout=timeout, connector=connector)
 
+    async def _worker(self):
+        while True:
+            handler, request, fut = await self.request_queue.get()
+            try:
+                # Skip if already cancelled while waiting in the queue
+                if fut.cancelled():
+                    continue
+                res = await self.__process_enqueued_request(handler, request)
+                if not fut.cancelled():
+                    fut.set_result(res)
+            except Exception as e:
+                if not fut.cancelled():
+                    fut.set_exception(e)
+            finally:
+                self.request_queue.task_done()
+
     def create_handler(
         self,
         handler: EndpointHandler[ApiPayload_T],
@@ -107,26 +125,59 @@ class Backend:
 
     #######################################Private#######################################
     def _fetch_pubkey(self):
-        report_addr = self.report_addr.rstrip("/")
+        command = ["curl", "-X", "GET", "https://run.vast.ai/pubkey/"]
-        command = ["curl", "-X", "GET", f"{report_addr}/pubkey/"]
+        result = subprocess.check_output(command, universal_newlines=True)
-        try:
+        log.debug("public key:")
-            result = subprocess.check_output(command, universal_newlines=True)
+        log.debug(result)
-            log.debug("public key:")
+        key = None
-            log.debug(result)
+        for _ in range(5):
-            key = RSA.import_key(result)
+            try:
-            if key is not None:
+                key = RSA.import_key(result)
-                return key
+                break
-        except (ValueError , subprocess.CalledProcessError) as e:
+            except ValueError as e:
-            log.debug(f"Error downloading key: {e}")
+                log.debug(f"Error downloading key: {e}")
-        self.backend_errored("Failed to get autoscaler pubkey")
+                time.sleep(15)
-       
+        if key is None:
+            self._total_pubkey_fetch_errors += 1
+            if self._total_pubkey_fetch_errors >= MAX_PUBKEY_FETCH_ATTEMPTS:
+                self.backend_errored("Failed to get autoscaler pubkey")
+        return key
 
     async def __handle_request(
         self,
         handler: EndpointHandler[ApiPayload_T],
         request: web.Request,
     ) -> Union[web.Response, web.StreamResponse]:
-        """use this function to forward requests to the model endpoint"""
+        """use this function to enqueue requests for FIFO processing"""
+        loop = get_running_loop()
+        fut: asyncio.Future = loop.create_future()
+
+        # If the client disconnects while waiting in the FIFO, cancel the future so the worker skips it
+        cancel_watch = create_task(request.wait_for_disconnection())
+        def _cancel_if_disconnected(_):
+            if not fut.done():
+                fut.cancel()
+        cancel_watch.add_done_callback(_cancel_if_disconnected)
+
+        try:
+            await self.request_queue.put((handler, request, fut))
+            return await fut
+        except asyncio.CancelledError:
+            # Propagate cancellation to ensure aiohttp doesn't expect a response body
+            raise
+        finally:
+            # Best-effort cleanup of the watcher
+            cancel_watch.cancel()
+
+    async def __process_enqueued_request(
+        self,
+        handler: EndpointHandler[ApiPayload_T],
+        request: web.Request,
+    ) -> Union[web.Response, web.StreamResponse]:
+        """
+        This contains the original __handle_request logic and is invoked by workers,
+        ensuring FIFO execution via asyncio.Queue.
+        """
         try:
             data = await request.json()
             auth_data, payload = handler.get_data_from_request(data)
@@ -134,8 +185,11 @@ class Backend:
             return web.json_response(data=e.message, status=422)
         except json.JSONDecodeError:
             return web.json_response(dict(error="invalid JSON"), status=422)
+
         workload = payload.count_workload()
-        request_metrics: RequestMetrics = RequestMetrics(request_idx=auth_data.request_idx, reqnum=auth_data.reqnum, workload=workload, status="Created")
+        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:
             await request.wait_for_disconnection()
@@ -176,6 +230,8 @@ class Backend:
         acquired = False
         try:
             self.metrics._request_start(request_metrics)
+
+            # Preserve existing semaphore behavior for serializing requests when requested
             if self.allow_parallel_requests is False:
                 log.debug(f"Waiting to aquire Sem for reqnum:{request_metrics.reqnum}")
                 await self.sem.acquire()
@@ -185,6 +241,7 @@ class Backend:
                 )
             else:
                 log.debug(f"Starting request for reqnum:{request_metrics.reqnum}")
+
             done, pending = await wait(
                 [
                     create_task(make_request()),
@@ -252,8 +309,14 @@ class Backend:
                 self.backend_errored(str(e))
 
     async def _start_tracking(self) -> None:
+        # Start the FIFO workers alongside existing loops
+        worker_tasks = tuple(self._worker() for _ in range(self._num_workers))
         await gather(
-            self.__read_logs(), self.metrics._send_metrics_loop(), self.__healthcheck(), self.metrics._send_delete_requests_loop()
+            self.__read_logs(),
+            self.metrics._send_metrics_loop(),
+            self.__healthcheck(),
+            self.metrics._send_delete_requests_loop(),
+            *worker_tasks,
         )
 
     def backend_errored(self, msg: str) -> None:
@@ -285,7 +348,7 @@ class Backend:
         message = {
             key: value
             for (key, value) in (dataclasses.asdict(auth_data).items())
-            if key != "signature" and key != "__request_id"
+            if key != "signature"
         }
         if auth_data.reqnum < (self.reqnum - MSG_HISTORY_LEN):
             log.debug(
@@ -295,7 +358,7 @@ class Backend:
         elif message in self.msg_history:
             log.debug(f"message: {message} already in message history")
             return False
-        elif verify_signature(json.dumps(message, indent=4, sort_keys=True), auth_data.signature):
+        elif verify_signature(json.dumps(message, indent=4), auth_data.signature):
             self.reqnum = max(auth_data.reqnum, self.reqnum)
             self.msg_history.append(message)
             self.msg_history = self.msg_history[-MSG_HISTORY_LEN:]
@@ -314,10 +377,10 @@ 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 +455,7 @@ 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

@@ -65,12 +65,12 @@ class ApiPayload(ABC):
 class AuthData:
     """data used to authenticate requester"""
 
+    signature: str
     cost: str
     endpoint: str
     reqnum: int
-    request_idx: int
-    signature: str
     url: str
+    request_idx: int
 
     @classmethod
     def from_json_msg(cls, json_msg: Dict[str, Any]):
@@ -190,12 +190,11 @@ class SystemMetrics:
         self.additional_disk_usage = disk_usage - self.last_disk_usage
         self.last_disk_usage = disk_usage
 
-    def reset(self, expected: float | None) -> None:
+    def reset(self):
         # autoscaler excepts model_loading_time to be populated only once, when the instance has
         # finished benchmarking and is ready to receive requests. This applies to restarted instances
         # as well: they should send model_loading_time once when they are done loading
-        if self.model_loading_time == expected:
+        self.model_loading_time = None
-            self.model_loading_time = None
 
 
 @dataclass

lib/metrics.py

@@ -180,10 +180,6 @@ class Metrics:
             return  # nothing to do
 
         for report_addr in self.report_addr:
-            # TODO: Add a Redis subscriber queue for delete_requests
-            if report_addr == "https://cloud.vast.ai/api/v0":
-                # Patch: ignore the Redis API report_addr
-                continue
             sent_success = True
             sent_failed  = True
 
@@ -204,13 +200,11 @@ class Metrics:
 
     async def __send_metrics_and_reset(self):
 
-        loadtime_snapshot = self.system_metrics.model_loading_time
-
         def compute_autoscaler_data() -> AutoScalerData:
             return AutoScalerData(
                 id=self.id,
                 version=self.version,
-                loadtime=(loadtime_snapshot or 0.0), 
+                loadtime=(self.system_metrics.model_loading_time or 0.0),
                 new_load=self.model_metrics.workload_processing,
                 cur_load=self.model_metrics.cur_load,
                 rej_load=self.model_metrics.workload_rejected,
@@ -258,15 +252,11 @@ class Metrics:
 
         self.system_metrics.update_disk_usage()
 
-        sent = False
         for report_addr in self.report_addr:
-            if await send_data(report_addr):
+            success = await send_data(report_addr)
-                sent = True
+            if success is True:
                 break
-
+        self.update_pending = False
-        if sent:
+        self.model_metrics.reset()
-            # clear the one-shot loadtime only if we actually sent *this* value
+        self.system_metrics.reset()
-            self.system_metrics.reset(expected=loadtime_snapshot)
+        self.last_metric_update = time.time()
-            self.update_pending = False
-            self.model_metrics.reset()
-            self.last_metric_update = time.time()

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="${REPORT_ADDR:-https://run.vast.ai}"
+REPORT_ADDR="${REPORT_ADDR:-https://cloud.vast.ai/api/v0,https://run.vast.ai}"
 USE_SSL="${USE_SSL:-true}"
 WORKER_PORT="${WORKER_PORT:-3000}"
 mkdir -p "$WORKSPACE_DIR"

workers/comfyui-json/client.py

@@ -98,7 +98,6 @@ 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

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

workers/openai/server.py

@@ -43,7 +43,6 @@ backend = Backend(
             for error_msg in MODEL_SERVER_ERROR_LOG_MSGS
         ],
     ],
-    max_wait_time=600
 )
 
 

workers/tgi/server.py

@@ -113,7 +113,6 @@ backend = Backend(
             for error_msg in MODEL_SERVER_ERROR_LOG_MSGS
         ],
     ],
-    max_wait_time=600
 )