api_server.py

# SPDX-License-Identifier: Apache-2.0
# SPDX-FileCopyrightText: Copyright contributors to the vLLM project
import asyncio
import hashlib
import importlib
import inspect
import json
import multiprocessing
import multiprocessing.forkserver as forkserver
import os
import secrets
import signal
import socket
import tempfile
import uuid
from argparse import Namespace
from collections.abc import AsyncIterator, Awaitable
from contextlib import asynccontextmanager
from http import HTTPStatus
from typing import Any

import model_hosting_container_standards.sagemaker as sagemaker_standards
import pydantic
import uvloop
from fastapi import APIRouter, FastAPI, HTTPException, Request
from fastapi.exceptions import RequestValidationError
from fastapi.middleware.cors import CORSMiddleware
from fastapi.responses import JSONResponse
from starlette.concurrency import iterate_in_threadpool
from starlette.datastructures import URL, Headers, MutableHeaders, State
from starlette.types import ASGIApp, Message, Receive, Scope, Send

import vllm.envs as envs
from vllm.engine.arg_utils import AsyncEngineArgs
from vllm.engine.protocol import EngineClient
from vllm.entrypoints.chat_utils import load_chat_template
from vllm.entrypoints.launcher import serve_http
from vllm.entrypoints.logger import RequestLogger
from vllm.entrypoints.openai.cli_args import make_arg_parser, validate_parsed_serve_args
from vllm.entrypoints.openai.engine.protocol import (
    ErrorInfo,
    ErrorResponse,
)
from vllm.entrypoints.openai.engine.serving import OpenAIServing
from vllm.entrypoints.openai.models.protocol import BaseModelPath
from vllm.entrypoints.openai.models.serving import (
    OpenAIServingModels,
)
from vllm.entrypoints.serve.elastic_ep.middleware import (
    ScalingMiddleware,
)
from vllm.entrypoints.serve.tokenize.serving import OpenAIServingTokenization
from vllm.entrypoints.utils import (
    cli_env_setup,
    log_non_default_args,
    log_version_and_model,
    process_lora_modules,
    sanitize_message,
)
from vllm.exceptions import VLLMValidationError
from vllm.logger import init_logger
from vllm.reasoning import ReasoningParserManager
from vllm.tasks import POOLING_TASKS, SupportedTask
from vllm.tool_parsers import ToolParserManager
from vllm.usage.usage_lib import UsageContext
from vllm.utils.argparse_utils import FlexibleArgumentParser
from vllm.utils.gc_utils import freeze_gc_heap
from vllm.utils.network_utils import is_valid_ipv6_address
from vllm.utils.system_utils import decorate_logs, set_ulimit
from vllm.version import __version__ as VLLM_VERSION

prometheus_multiproc_dir: tempfile.TemporaryDirectory

# Cannot use __name__ (https://github.com/vllm-project/vllm/pull/4765)
logger = init_logger("vllm.entrypoints.openai.api_server")


_running_tasks: set[asyncio.Task] = set()


@asynccontextmanager
async def lifespan(app: FastAPI):
    try:
        if app.state.log_stats:
            engine_client: EngineClient = app.state.engine_client

            async def _force_log():
                while True:
                    await asyncio.sleep(envs.VLLM_LOG_STATS_INTERVAL)
                    await engine_client.do_log_stats()

            task = asyncio.create_task(_force_log())
            _running_tasks.add(task)
            task.add_done_callback(_running_tasks.remove)
        else:
            task = None

        # Mark the startup heap as static so that it's ignored by GC.
        # Reduces pause times of oldest generation collections.
        freeze_gc_heap()
        try:
            yield
        finally:
            if task is not None:
                task.cancel()
    finally:
        # Ensure app state including engine ref is gc'd
        del app.state


@asynccontextmanager
async def build_async_engine_client(
    args: Namespace,
    *,
    usage_context: UsageContext = UsageContext.OPENAI_API_SERVER,
    disable_frontend_multiprocessing: bool | None = None,
    client_config: dict[str, Any] | None = None,
) -> AsyncIterator[EngineClient]:
    if os.getenv("VLLM_WORKER_MULTIPROC_METHOD") == "forkserver":
        # The executor is expected to be mp.
        # Pre-import heavy modules in the forkserver process
        logger.debug("Setup forkserver with pre-imports")
        multiprocessing.set_start_method("forkserver")
        multiprocessing.set_forkserver_preload(["vllm.v1.engine.async_llm"])
        forkserver.ensure_running()
        logger.debug("Forkserver setup complete!")

    # Context manager to handle engine_client lifecycle
    # Ensures everything is shutdown and cleaned up on error/exit
    engine_args = AsyncEngineArgs.from_cli_args(args)
    if client_config:
        engine_args._api_process_count = client_config.get("client_count", 1)
        engine_args._api_process_rank = client_config.get("client_index", 0)

    if disable_frontend_multiprocessing is None:
        disable_frontend_multiprocessing = bool(args.disable_frontend_multiprocessing)

    async with build_async_engine_client_from_engine_args(
        engine_args,
        usage_context=usage_context,
        disable_frontend_multiprocessing=disable_frontend_multiprocessing,
        client_config=client_config,
    ) as engine:
        yield engine


@asynccontextmanager
async def build_async_engine_client_from_engine_args(
    engine_args: AsyncEngineArgs,
    *,
    usage_context: UsageContext = UsageContext.OPENAI_API_SERVER,
    disable_frontend_multiprocessing: bool = False,
    client_config: dict[str, Any] | None = None,
) -> AsyncIterator[EngineClient]:
    """
    Create EngineClient, either:
        - in-process using the AsyncLLMEngine Directly
        - multiprocess using AsyncLLMEngine RPC

    Returns the Client or None if the creation failed.
    """

    # Create the EngineConfig (determines if we can use V1).
    vllm_config = engine_args.create_engine_config(usage_context=usage_context)

    if disable_frontend_multiprocessing:
        logger.warning("V1 is enabled, but got --disable-frontend-multiprocessing.")

    from vllm.v1.engine.async_llm import AsyncLLM

    async_llm: AsyncLLM | None = None

    # Don't mutate the input client_config
    client_config = dict(client_config) if client_config else {}
    client_count = client_config.pop("client_count", 1)
    client_index = client_config.pop("client_index", 0)

    try:
        async_llm = AsyncLLM.from_vllm_config(
            vllm_config=vllm_config,
            usage_context=usage_context,
            enable_log_requests=engine_args.enable_log_requests,
            aggregate_engine_logging=engine_args.aggregate_engine_logging,
            disable_log_stats=engine_args.disable_log_stats,
            client_addresses=client_config,
            client_count=client_count,
            client_index=client_index,
        )

        # Don't keep the dummy data in memory
        assert async_llm is not None
        await async_llm.reset_mm_cache()

        yield async_llm
    finally:
        if async_llm:
            async_llm.shutdown()


router = APIRouter()


def base(request: Request) -> OpenAIServing:
    # Reuse the existing instance
    return tokenization(request)


def tokenization(request: Request) -> OpenAIServingTokenization:
    return request.app.state.openai_serving_tokenization


def engine_client(request: Request) -> EngineClient:
    return request.app.state.engine_client


@router.get("/load")
async def get_server_load_metrics(request: Request):
    # This endpoint returns the current server load metrics.
    # It tracks requests utilizing the GPU from the following routes:
    # - /v1/responses
    # - /v1/responses/{response_id}
    # - /v1/responses/{response_id}/cancel
    # - /v1/messages
    # - /v1/chat/completions
    # - /v1/completions
    # - /v1/audio/transcriptions
    # - /v1/audio/translations
    # - /v1/embeddings
    # - /pooling
    # - /classify
    # - /score
    # - /v1/score
    # - /rerank
    # - /v1/rerank
    # - /v2/rerank
    return JSONResponse(content={"server_load": request.app.state.server_load_metrics})


@router.get("/version")
async def show_version():
    ver = {"version": VLLM_VERSION}
    return JSONResponse(content=ver)


def load_log_config(log_config_file: str | None) -> dict | None:
    if not log_config_file:
        return None
    try:
        with open(log_config_file) as f:
            return json.load(f)
    except Exception as e:
        logger.warning(
            "Failed to load log config from file %s: error %s", log_config_file, e
        )
        return None


def get_uvicorn_log_config(args: Namespace) -> dict | None:
    """
    Get the uvicorn log config based on the provided arguments.

    Priority:
    1. If log_config_file is specified, use it
    2. If disable_access_log_for_endpoints is specified, create a config with
       the access log filter
    3. Otherwise, return None (use uvicorn defaults)
    """
    # First, try to load from file if specified
    log_config = load_log_config(args.log_config_file)
    if log_config is not None:
        return log_config

    # If endpoints to filter are specified, create a config with the filter
    if args.disable_access_log_for_endpoints:
        from vllm.logging_utils import create_uvicorn_log_config

        # Parse comma-separated string into list
        excluded_paths = [
            p.strip()
            for p in args.disable_access_log_for_endpoints.split(",")
            if p.strip()
        ]
        return create_uvicorn_log_config(
            excluded_paths=excluded_paths,
            log_level=args.uvicorn_log_level,
        )

    return None


class AuthenticationMiddleware:
    """
    Pure ASGI middleware that authenticates each request by checking
    if the Authorization Bearer token exists and equals anyof "{api_key}".

    Notes
    -----
    There are two cases in which authentication is skipped:
        1. The HTTP method is OPTIONS.
        2. The request path doesn't start with /v1 (e.g. /health).
    """

    def __init__(self, app: ASGIApp, tokens: list[str]) -> None:
        self.app = app
        self.api_tokens = [hashlib.sha256(t.encode("utf-8")).digest() for t in tokens]

    def verify_token(self, headers: Headers) -> bool:
        authorization_header_value = headers.get("Authorization")
        if not authorization_header_value:
            return False

        scheme, _, param = authorization_header_value.partition(" ")
        if scheme.lower() != "bearer":
            return False

        param_hash = hashlib.sha256(param.encode("utf-8")).digest()

        token_match = False
        for token_hash in self.api_tokens:
            token_match |= secrets.compare_digest(param_hash, token_hash)

        return token_match

    def __call__(self, scope: Scope, receive: Receive, send: Send) -> Awaitable[None]:
        if scope["type"] not in ("http", "websocket") or scope["method"] == "OPTIONS":
            # scope["type"] can be "lifespan" or "startup" for example,
            # in which case we don't need to do anything
            return self.app(scope, receive, send)
        root_path = scope.get("root_path", "")
        url_path = URL(scope=scope).path.removeprefix(root_path)
        headers = Headers(scope=scope)
        # Type narrow to satisfy mypy.
        if url_path.startswith("/v1") and not self.verify_token(headers):
            response = JSONResponse(content={"error": "Unauthorized"}, status_code=401)
            return response(scope, receive, send)
        return self.app(scope, receive, send)


class XRequestIdMiddleware:
    """
    Middleware the set's the X-Request-Id header for each response
    to a random uuid4 (hex) value if the header isn't already
    present in the request, otherwise use the provided request id.
    """

    def __init__(self, app: ASGIApp) -> None:
        self.app = app

    def __call__(self, scope: Scope, receive: Receive, send: Send) -> Awaitable[None]:
        if scope["type"] not in ("http", "websocket"):
            return self.app(scope, receive, send)

        # Extract the request headers.
        request_headers = Headers(scope=scope)

        async def send_with_request_id(message: Message) -> None:
            """
            Custom send function to mutate the response headers
            and append X-Request-Id to it.
            """
            if message["type"] == "http.response.start":
                response_headers = MutableHeaders(raw=message["headers"])
                request_id = request_headers.get("X-Request-Id", uuid.uuid4().hex)
                response_headers.append("X-Request-Id", request_id)
            await send(message)

        return self.app(scope, receive, send_with_request_id)


def _extract_content_from_chunk(chunk_data: dict) -> str:
    """Extract content from a streaming response chunk."""
    try:
        from vllm.entrypoints.openai.chat_completion.protocol import (
            ChatCompletionStreamResponse,
        )
        from vllm.entrypoints.openai.completion.protocol import (
            CompletionStreamResponse,
        )

        # Try using Completion types for type-safe parsing
        if chunk_data.get("object") == "chat.completion.chunk":
            chat_response = ChatCompletionStreamResponse.model_validate(chunk_data)
            if chat_response.choices and chat_response.choices[0].delta.content:
                return chat_response.choices[0].delta.content
        elif chunk_data.get("object") == "text_completion":
            completion_response = CompletionStreamResponse.model_validate(chunk_data)
            if completion_response.choices and completion_response.choices[0].text:
                return completion_response.choices[0].text
    except pydantic.ValidationError:
        # Fallback to manual parsing
        if "choices" in chunk_data and chunk_data["choices"]:
            choice = chunk_data["choices"][0]
            if "delta" in choice and choice["delta"].get("content"):
                return choice["delta"]["content"]
            elif choice.get("text"):
                return choice["text"]
    return ""


class SSEDecoder:
    """Robust Server-Sent Events decoder for streaming responses."""

    def __init__(self):
        self.buffer = ""
        self.content_buffer = []

    def decode_chunk(self, chunk: bytes) -> list[dict]:
        """Decode a chunk of SSE data and return parsed events."""
        import json

        try:
            chunk_str = chunk.decode("utf-8")
        except UnicodeDecodeError:
            # Skip malformed chunks
            return []

        self.buffer += chunk_str
        events = []

        # Process complete lines
        while "\n" in self.buffer:
            line, self.buffer = self.buffer.split("\n", 1)
            line = line.rstrip("\r")  # Handle CRLF

            if line.startswith("data: "):
                data_str = line[6:].strip()
                if data_str == "[DONE]":
                    events.append({"type": "done"})
                elif data_str:
                    try:
                        event_data = json.loads(data_str)
                        events.append({"type": "data", "data": event_data})
                    except json.JSONDecodeError:
                        # Skip malformed JSON
                        continue

        return events

    def extract_content(self, event_data: dict) -> str:
        """Extract content from event data."""
        return _extract_content_from_chunk(event_data)

    def add_content(self, content: str) -> None:
        """Add content to the buffer."""
        if content:
            self.content_buffer.append(content)

    def get_complete_content(self) -> str:
        """Get the complete buffered content."""
        return "".join(self.content_buffer)


def _log_streaming_response(response, response_body: list) -> None:
    """Log streaming response with robust SSE parsing."""
    from starlette.concurrency import iterate_in_threadpool

    sse_decoder = SSEDecoder()
    chunk_count = 0

    def buffered_iterator():
        nonlocal chunk_count

        for chunk in response_body:
            chunk_count += 1
            yield chunk

            # Parse SSE events from chunk
            events = sse_decoder.decode_chunk(chunk)

            for event in events:
                if event["type"] == "data":
                    content = sse_decoder.extract_content(event["data"])
                    sse_decoder.add_content(content)
                elif event["type"] == "done":
                    # Log complete content when done
                    full_content = sse_decoder.get_complete_content()
                    if full_content:
                        # Truncate if too long
                        if len(full_content) > 2048:
                            full_content = full_content[:2048] + ""
                            "...[truncated]"
                        logger.info(
                            "response_body={streaming_complete: content=%r, chunks=%d}",
                            full_content,
                            chunk_count,
                        )
                    else:
                        logger.info(
                            "response_body={streaming_complete: no_content, chunks=%d}",
                            chunk_count,
                        )
                    return

    response.body_iterator = iterate_in_threadpool(buffered_iterator())
    logger.info("response_body={streaming_started: chunks=%d}", len(response_body))


def _log_non_streaming_response(response_body: list) -> None:
    """Log non-streaming response."""
    try:
        decoded_body = response_body[0].decode()
        logger.info("response_body={%s}", decoded_body)
    except UnicodeDecodeError:
        logger.info("response_body={<binary_data>}")


def build_app(args: Namespace, supported_tasks: tuple["SupportedTask", ...]) -> FastAPI:
    if args.disable_fastapi_docs:
        app = FastAPI(
            openapi_url=None, docs_url=None, redoc_url=None, lifespan=lifespan
        )
    elif args.enable_offline_docs:
        app = FastAPI(docs_url=None, redoc_url=None, lifespan=lifespan)
    else:
        app = FastAPI(lifespan=lifespan)
    app.state.args = args
    app.include_router(router)

    from vllm.entrypoints.serve import register_vllm_serve_api_routers

    register_vllm_serve_api_routers(app)

    from vllm.entrypoints.openai.models.api_router import (
        attach_router as register_models_api_router,
    )

    register_models_api_router(app)

    from vllm.entrypoints.sagemaker.api_router import (
        attach_router as register_sagemaker_api_router,
    )

    register_sagemaker_api_router(app, supported_tasks)

    if "generate" in supported_tasks:
        from vllm.entrypoints.openai.generate.api_router import (
            register_generate_api_routers,
        )

        register_generate_api_routers(app)

    if "transcription" in supported_tasks:
        from vllm.entrypoints.openai.translations.api_router import (
            attach_router as register_translations_api_router,
        )

        register_translations_api_router(app)

    if any(task in POOLING_TASKS for task in supported_tasks):
        from vllm.entrypoints.pooling import register_pooling_api_routers

        register_pooling_api_routers(app, supported_tasks)

    app.root_path = args.root_path
    app.add_middleware(
        CORSMiddleware,
        allow_origins=args.allowed_origins,
        allow_credentials=args.allow_credentials,
        allow_methods=args.allowed_methods,
        allow_headers=args.allowed_headers,
    )

    @app.exception_handler(HTTPException)
    async def http_exception_handler(_: Request, exc: HTTPException):
        err = ErrorResponse(
            error=ErrorInfo(
                message=sanitize_message(exc.detail),
                type=HTTPStatus(exc.status_code).phrase,
                code=exc.status_code,
            )
        )
        return JSONResponse(err.model_dump(), status_code=exc.status_code)

    @app.exception_handler(RequestValidationError)
    async def validation_exception_handler(_: Request, exc: RequestValidationError):
        param = None
        errors = exc.errors()
        for error in errors:
            if "ctx" in error and "error" in error["ctx"]:
                ctx_error = error["ctx"]["error"]
                if isinstance(ctx_error, VLLMValidationError):
                    param = ctx_error.parameter
                    break

        exc_str = str(exc)
        errors_str = str(errors)

        if errors and errors_str and errors_str != exc_str:
            message = f"{exc_str} {errors_str}"
        else:
            message = exc_str

        err = ErrorResponse(
            error=ErrorInfo(
                message=sanitize_message(message),
                type=HTTPStatus.BAD_REQUEST.phrase,
                code=HTTPStatus.BAD_REQUEST,
                param=param,
            )
        )
        return JSONResponse(err.model_dump(), status_code=HTTPStatus.BAD_REQUEST)

    # Ensure --api-key option from CLI takes precedence over VLLM_API_KEY
    if tokens := [key for key in (args.api_key or [envs.VLLM_API_KEY]) if key]:
        app.add_middleware(AuthenticationMiddleware, tokens=tokens)

    if args.enable_request_id_headers:
        app.add_middleware(XRequestIdMiddleware)

    # Add scaling middleware to check for scaling state
    app.add_middleware(ScalingMiddleware)

    if envs.VLLM_DEBUG_LOG_API_SERVER_RESPONSE:
        logger.warning(
            "CAUTION: Enabling log response in the API Server. "
            "This can include sensitive information and should be "
            "avoided in production."
        )

        @app.middleware("http")
        async def log_response(request: Request, call_next):
            response = await call_next(request)
            response_body = [section async for section in response.body_iterator]
            response.body_iterator = iterate_in_threadpool(iter(response_body))
            # Check if this is a streaming response by looking at content-type
            content_type = response.headers.get("content-type", "")
            is_streaming = content_type == "text/event-stream; charset=utf-8"

            # Log response body based on type
            if not response_body:
                logger.info("response_body={<empty>}")
            elif is_streaming:
                _log_streaming_response(response, response_body)
            else:
                _log_non_streaming_response(response_body)
            return response

    for middleware in args.middleware:
        module_path, object_name = middleware.rsplit(".", 1)
        imported = getattr(importlib.import_module(module_path), object_name)
        if inspect.isclass(imported):
            app.add_middleware(imported)  # type: ignore[arg-type]
        elif inspect.iscoroutinefunction(imported):
            app.middleware("http")(imported)
        else:
            raise ValueError(
                f"Invalid middleware {middleware}. Must be a function or a class."
            )

    app = sagemaker_standards.bootstrap(app)

    return app


async def init_app_state(
    engine_client: EngineClient,
    state: State,
    args: Namespace,
    supported_tasks: tuple["SupportedTask", ...],
) -> None:
    vllm_config = engine_client.vllm_config

    if args.served_model_name is not None:
        served_model_names = args.served_model_name
    else:
        served_model_names = [args.model]

    if args.enable_log_requests:
        request_logger = RequestLogger(max_log_len=args.max_log_len)
    else:
        request_logger = None

    base_model_paths = [
        BaseModelPath(name=name, model_path=args.model) for name in served_model_names
    ]

    state.engine_client = engine_client
    state.log_stats = not args.disable_log_stats
    state.vllm_config = vllm_config
    state.args = args
    resolved_chat_template = load_chat_template(args.chat_template)

    # Merge default_mm_loras into the static lora_modules
    default_mm_loras = (
        vllm_config.lora_config.default_mm_loras
        if vllm_config.lora_config is not None
        else {}
    )
    lora_modules = process_lora_modules(args.lora_modules, default_mm_loras)

    state.openai_serving_models = OpenAIServingModels(
        engine_client=engine_client,
        base_model_paths=base_model_paths,
        lora_modules=lora_modules,
    )
    await state.openai_serving_models.init_static_loras()
    state.openai_serving_tokenization = OpenAIServingTokenization(
        engine_client,
        state.openai_serving_models,
        request_logger=request_logger,
        chat_template=resolved_chat_template,
        chat_template_content_format=args.chat_template_content_format,
        trust_request_chat_template=args.trust_request_chat_template,
        log_error_stack=args.log_error_stack,
    )

    if "generate" in supported_tasks:
        from vllm.entrypoints.openai.generate.api_router import init_generate_state

        await init_generate_state(
            engine_client, state, args, request_logger, supported_tasks
        )

    if "transcription" in supported_tasks:
        from vllm.entrypoints.openai.translations.api_router import (
            init_transcription_state,
        )

        init_transcription_state(
            engine_client, state, args, request_logger, supported_tasks
        )

    if any(task in POOLING_TASKS for task in supported_tasks):
        from vllm.entrypoints.pooling import init_pooling_state

        init_pooling_state(engine_client, state, args, request_logger, supported_tasks)

    state.enable_server_load_tracking = args.enable_server_load_tracking
    state.server_load_metrics = 0


def create_server_socket(addr: tuple[str, int]) -> socket.socket:
    family = socket.AF_INET
    if is_valid_ipv6_address(addr[0]):
        family = socket.AF_INET6

    sock = socket.socket(family=family, type=socket.SOCK_STREAM)
    sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
    sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEPORT, 1)
    sock.bind(addr)

    return sock


def create_server_unix_socket(path: str) -> socket.socket:
    sock = socket.socket(family=socket.AF_UNIX, type=socket.SOCK_STREAM)
    sock.bind(path)
    return sock


def validate_api_server_args(args):
    valid_tool_parses = ToolParserManager.list_registered()
    if args.enable_auto_tool_choice and args.tool_call_parser not in valid_tool_parses:
        raise KeyError(
            f"invalid tool call parser: {args.tool_call_parser} "
            f"(chose from {{ {','.join(valid_tool_parses)} }})"
        )

    valid_reasoning_parsers = ReasoningParserManager.list_registered()
    if (
        reasoning_parser := args.structured_outputs_config.reasoning_parser
    ) and reasoning_parser not in valid_reasoning_parsers:
        raise KeyError(
            f"invalid reasoning parser: {reasoning_parser} "
            f"(chose from {{ {','.join(valid_reasoning_parsers)} }})"
        )


def setup_server(args):
    """Validate API server args, set up signal handler, create socket
    ready to serve."""

    log_version_and_model(logger, VLLM_VERSION, args.model)
    log_non_default_args(args)

    if args.tool_parser_plugin and len(args.tool_parser_plugin) > 3:
        ToolParserManager.import_tool_parser(args.tool_parser_plugin)

    if args.reasoning_parser_plugin and len(args.reasoning_parser_plugin) > 3:
        ReasoningParserManager.import_reasoning_parser(args.reasoning_parser_plugin)

    validate_api_server_args(args)

    # workaround to make sure that we bind the port before the engine is set up.
    # This avoids race conditions with ray.
    # see https://github.com/vllm-project/vllm/issues/8204
    if args.uds:
        sock = create_server_unix_socket(args.uds)
    else:
        sock_addr = (args.host or "", args.port)
        sock = create_server_socket(sock_addr)

    # workaround to avoid footguns where uvicorn drops requests with too
    # many concurrent requests active
    set_ulimit()

    def signal_handler(*_) -> None:
        # Interrupt server on sigterm while initializing
        raise KeyboardInterrupt("terminated")

    signal.signal(signal.SIGTERM, signal_handler)

    if args.uds:
        listen_address = f"unix:{args.uds}"
    else:
        addr, port = sock_addr
        is_ssl = args.ssl_keyfile and args.ssl_certfile
        host_part = f"[{addr}]" if is_valid_ipv6_address(addr) else addr or "0.0.0.0"
        listen_address = f"http{'s' if is_ssl else ''}://{host_part}:{port}"
    return listen_address, sock


async def run_server(args, **uvicorn_kwargs) -> None:
    """Run a single-worker API server."""

    # Add process-specific prefix to stdout and stderr.
    decorate_logs("APIServer")

    listen_address, sock = setup_server(args)
    await run_server_worker(listen_address, sock, args, **uvicorn_kwargs)


async def run_server_worker(
    listen_address, sock, args, client_config=None, **uvicorn_kwargs
) -> None:
    """Run a single API server worker."""

    if args.tool_parser_plugin and len(args.tool_parser_plugin) > 3:
        ToolParserManager.import_tool_parser(args.tool_parser_plugin)

    if args.reasoning_parser_plugin and len(args.reasoning_parser_plugin) > 3:
        ReasoningParserManager.import_reasoning_parser(args.reasoning_parser_plugin)

    # Get uvicorn log config (from file or with endpoint filter)
    log_config = get_uvicorn_log_config(args)
    if log_config is not None:
        uvicorn_kwargs["log_config"] = log_config

    async with build_async_engine_client(
        args,
        client_config=client_config,
    ) as engine_client:
        supported_tasks = await engine_client.get_supported_tasks()
        logger.info("Supported tasks: %s", supported_tasks)

        app = build_app(args, supported_tasks)
        await init_app_state(engine_client, app.state, args, supported_tasks)

        logger.info(
            "Starting vLLM API server %d on %s",
            engine_client.vllm_config.parallel_config._api_process_rank,
            listen_address,
        )
        shutdown_task = await serve_http(
            app,
            sock=sock,
            enable_ssl_refresh=args.enable_ssl_refresh,
            host=args.host,
            port=args.port,
            log_level=args.uvicorn_log_level,
            # NOTE: When the 'disable_uvicorn_access_log' value is True,
            # no access log will be output.
            access_log=not args.disable_uvicorn_access_log,
            timeout_keep_alive=envs.VLLM_HTTP_TIMEOUT_KEEP_ALIVE,
            ssl_keyfile=args.ssl_keyfile,
            ssl_certfile=args.ssl_certfile,
            ssl_ca_certs=args.ssl_ca_certs,
            ssl_cert_reqs=args.ssl_cert_reqs,
            ssl_ciphers=args.ssl_ciphers,
            h11_max_incomplete_event_size=args.h11_max_incomplete_event_size,
            h11_max_header_count=args.h11_max_header_count,
            **uvicorn_kwargs,
        )

    # NB: Await server shutdown only after the backend context is exited
    try:
        await shutdown_task
    finally:
        sock.close()


if __name__ == "__main__":
    # NOTE(simon):
    # This section should be in sync with vllm/entrypoints/cli/main.py for CLI
    # entrypoints.
    cli_env_setup()
    parser = FlexibleArgumentParser(
        description="vLLM OpenAI-Compatible RESTful API server."
    )
    parser = make_arg_parser(parser)
    args = parser.parse_args()
    validate_parsed_serve_args(args)

    uvloop.run(run_server(args))