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proc
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self
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root
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proc
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self
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root
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opt
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imh-python
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lib
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python3.9
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site-packages
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uvicorn
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lifespan
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Filename :
on.py
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from __future__ import annotations import asyncio import logging from asyncio import Queue from typing import Any, Union from uvicorn import Config from uvicorn._types import ( LifespanScope, LifespanShutdownCompleteEvent, LifespanShutdownEvent, LifespanShutdownFailedEvent, LifespanStartupCompleteEvent, LifespanStartupEvent, LifespanStartupFailedEvent, ) LifespanReceiveMessage = Union[LifespanStartupEvent, LifespanShutdownEvent] LifespanSendMessage = Union[ LifespanStartupFailedEvent, LifespanShutdownFailedEvent, LifespanStartupCompleteEvent, LifespanShutdownCompleteEvent, ] STATE_TRANSITION_ERROR = "Got invalid state transition on lifespan protocol." class LifespanOn: def __init__(self, config: Config) -> None: if not config.loaded: config.load() self.config = config self.logger = logging.getLogger("uvicorn.error") self.startup_event = asyncio.Event() self.shutdown_event = asyncio.Event() self.receive_queue: Queue[LifespanReceiveMessage] = asyncio.Queue() self.error_occured = False self.startup_failed = False self.shutdown_failed = False self.should_exit = False self.state: dict[str, Any] = {} async def startup(self) -> None: self.logger.info("Waiting for application startup.") loop = asyncio.get_event_loop() main_lifespan_task = loop.create_task(self.main()) # noqa: F841 # Keep a hard reference to prevent garbage collection # See https://github.com/encode/uvicorn/pull/972 startup_event: LifespanStartupEvent = {"type": "lifespan.startup"} await self.receive_queue.put(startup_event) await self.startup_event.wait() if self.startup_failed or (self.error_occured and self.config.lifespan == "on"): self.logger.error("Application startup failed. Exiting.") self.should_exit = True else: self.logger.info("Application startup complete.") async def shutdown(self) -> None: if self.error_occured: return self.logger.info("Waiting for application shutdown.") shutdown_event: LifespanShutdownEvent = {"type": "lifespan.shutdown"} await self.receive_queue.put(shutdown_event) await self.shutdown_event.wait() if self.shutdown_failed or (self.error_occured and self.config.lifespan == "on"): self.logger.error("Application shutdown failed. Exiting.") self.should_exit = True else: self.logger.info("Application shutdown complete.") async def main(self) -> None: try: app = self.config.loaded_app scope: LifespanScope = { "type": "lifespan", "asgi": {"version": self.config.asgi_version, "spec_version": "2.0"}, "state": self.state, } await app(scope, self.receive, self.send) except BaseException as exc: self.asgi = None self.error_occured = True if self.startup_failed or self.shutdown_failed: return if self.config.lifespan == "auto": msg = "ASGI 'lifespan' protocol appears unsupported." self.logger.info(msg) else: msg = "Exception in 'lifespan' protocol\n" self.logger.error(msg, exc_info=exc) finally: self.startup_event.set() self.shutdown_event.set() async def send(self, message: LifespanSendMessage) -> None: assert message["type"] in ( "lifespan.startup.complete", "lifespan.startup.failed", "lifespan.shutdown.complete", "lifespan.shutdown.failed", ) if message["type"] == "lifespan.startup.complete": assert not self.startup_event.is_set(), STATE_TRANSITION_ERROR assert not self.shutdown_event.is_set(), STATE_TRANSITION_ERROR self.startup_event.set() elif message["type"] == "lifespan.startup.failed": assert not self.startup_event.is_set(), STATE_TRANSITION_ERROR assert not self.shutdown_event.is_set(), STATE_TRANSITION_ERROR self.startup_event.set() self.startup_failed = True if message.get("message"): self.logger.error(message["message"]) elif message["type"] == "lifespan.shutdown.complete": assert self.startup_event.is_set(), STATE_TRANSITION_ERROR assert not self.shutdown_event.is_set(), STATE_TRANSITION_ERROR self.shutdown_event.set() elif message["type"] == "lifespan.shutdown.failed": assert self.startup_event.is_set(), STATE_TRANSITION_ERROR assert not self.shutdown_event.is_set(), STATE_TRANSITION_ERROR self.shutdown_event.set() self.shutdown_failed = True if message.get("message"): self.logger.error(message["message"]) async def receive(self) -> LifespanReceiveMessage: return await self.receive_queue.get()