✨ Feature: 重构驱动器 lifespan 方法 (#1860)

nonebot/drivers/_lifespan.py

@@ -0,0 +1,45 @@
+from typing import Any, List, Union, Callable, Awaitable, cast
+
+from nonebot.utils import run_sync, is_coroutine_callable
+
+SYNC_LIFESPAN_FUNC = Callable[[], Any]
+ASYNC_LIFESPAN_FUNC = Callable[[], Awaitable[Any]]
+LIFESPAN_FUNC = Union[SYNC_LIFESPAN_FUNC, ASYNC_LIFESPAN_FUNC]
+
+
+class Lifespan:
+    def __init__(self) -> None:
+        self._startup_funcs: List[LIFESPAN_FUNC] = []
+        self._shutdown_funcs: List[LIFESPAN_FUNC] = []
+
+    def on_startup(self, func: LIFESPAN_FUNC) -> LIFESPAN_FUNC:
+        self._startup_funcs.append(func)
+        return func
+
+    def on_shutdown(self, func: LIFESPAN_FUNC) -> LIFESPAN_FUNC:
+        self._shutdown_funcs.append(func)
+        return func
+
+    @staticmethod
+    async def _run_lifespan_func(
+        funcs: List[LIFESPAN_FUNC],
+    ) -> None:
+        for func in funcs:
+            if is_coroutine_callable(func):
+                await cast(ASYNC_LIFESPAN_FUNC, func)()
+            else:
+                await run_sync(cast(SYNC_LIFESPAN_FUNC, func))()
+
+    async def startup(self) -> None:
+        if self._startup_funcs:
+            await self._run_lifespan_func(self._startup_funcs)
+
+    async def shutdown(self) -> None:
+        if self._shutdown_funcs:
+            await self._run_lifespan_func(self._shutdown_funcs)
+
+    async def __aenter__(self) -> None:
+        await self.startup()
+
+    async def __aexit__(self, exc_type, exc_val, exc_tb) -> None:
+        await self.shutdown()

nonebot/drivers/aiohttp.py

@@ -27,7 +27,7 @@ from nonebot.drivers import HTTPVersion, ForwardMixin, ForwardDriver, combine_dr
 
 try:
     import aiohttp
-except ImportError as e:  # pragma: no cover
+except ModuleNotFoundError as e:  # pragma: no cover
     raise ImportError(
         "Please install aiohttp first to use this driver. `pip install nonebot2[aiohttp]`"
     ) from e

nonebot/drivers/fastapi.py

@@ -19,7 +19,7 @@ FrontMatter:
 import logging
 import contextlib
 from functools import wraps
-from typing import Any, Dict, List, Tuple, Union, Callable, Optional
+from typing import Any, Dict, List, Tuple, Union, Optional
 
 from pydantic import BaseSettings
 
@@ -32,12 +32,14 @@ from nonebot.drivers import Request as BaseRequest
 from nonebot.drivers import WebSocket as BaseWebSocket
 from nonebot.drivers import ReverseDriver, HTTPServerSetup, WebSocketServerSetup
 
+from ._lifespan import LIFESPAN_FUNC, Lifespan
+
 try:
     import uvicorn
     from fastapi.responses import Response
     from fastapi import FastAPI, Request, UploadFile, status
     from starlette.websockets import WebSocket, WebSocketState, WebSocketDisconnect
-except ImportError as e:  # pragma: no cover
+except ModuleNotFoundError as e:  # pragma: no cover
     raise ImportError(
         "Please install FastAPI by using `pip install nonebot2[fastapi]`"
     ) from e
@@ -92,7 +94,10 @@ class Driver(ReverseDriver):
 
         self.fastapi_config: Config = Config(**config.dict())
 
+        self._lifespan = Lifespan()
+
         self._server_app = FastAPI(
+            lifespan=self._lifespan_manager,
             openapi_url=self.fastapi_config.fastapi_openapi_url,
             docs_url=self.fastapi_config.fastapi_docs_url,
             redoc_url=self.fastapi_config.fastapi_redoc_url,
@@ -148,14 +153,20 @@ class Driver(ReverseDriver):
         )
 
     @overrides(ReverseDriver)
-    def on_startup(self, func: Callable) -> Callable:
-        """参考文档: `Events <https://fastapi.tiangolo.com/advanced/events/#startup-event>`_"""
-        return self.server_app.on_event("startup")(func)
+    def on_startup(self, func: LIFESPAN_FUNC) -> LIFESPAN_FUNC:
+        return self._lifespan.on_startup(func)
 
     @overrides(ReverseDriver)
-    def on_shutdown(self, func: Callable) -> Callable:
-        """参考文档: `Events <https://fastapi.tiangolo.com/advanced/events/#shutdown-event>`_"""
-        return self.server_app.on_event("shutdown")(func)
+    def on_shutdown(self, func: LIFESPAN_FUNC) -> LIFESPAN_FUNC:
+        return self._lifespan.on_shutdown(func)
+
+    @contextlib.asynccontextmanager
+    async def _lifespan_manager(self, app: FastAPI):
+        await self._lifespan.startup()
+        try:
+            yield
+        finally:
+            await self._lifespan.shutdown()
 
     @overrides(ReverseDriver)
     def run(

nonebot/drivers/httpx.py

@@ -31,7 +31,7 @@ from nonebot.drivers import (
 
 try:
     import httpx
-except ImportError as e:  # pragma: no cover
+except ModuleNotFoundError as e:  # pragma: no cover
     raise ImportError(
         "Please install httpx by using `pip install nonebot2[httpx]`"
     ) from e

nonebot/drivers/none.py

@@ -13,7 +13,6 @@ FrontMatter:
 import signal
 import asyncio
 import threading
-from typing import Set, Union, Callable, Awaitable, cast
 
 from nonebot.log import logger
 from nonebot.consts import WINDOWS
@@ -22,7 +21,8 @@ from nonebot.config import Env, Config
 from nonebot.drivers import Driver as BaseDriver
 from nonebot.utils import run_sync, is_coroutine_callable
 
-HOOK_FUNC = Union[Callable[[], None], Callable[[], Awaitable[None]]]
+from ._lifespan import LIFESPAN_FUNC, Lifespan
+
 HANDLED_SIGNALS = (
     signal.SIGINT,  # Unix signal 2. Sent by Ctrl+C.
     signal.SIGTERM,  # Unix signal 15. Sent by `kill <pid>`.
@@ -36,8 +36,9 @@ class Driver(BaseDriver):
 
     def __init__(self, env: Env, config: Config):
         super().__init__(env, config)
-        self.startup_funcs: Set[HOOK_FUNC] = set()
-        self.shutdown_funcs: Set[HOOK_FUNC] = set()
+
+        self._lifespan = Lifespan()
+
         self.should_exit: asyncio.Event = asyncio.Event()
         self.force_exit: bool = False
 
@@ -54,20 +55,18 @@ class Driver(BaseDriver):
         return logger
 
     @overrides(BaseDriver)
-    def on_startup(self, func: HOOK_FUNC) -> HOOK_FUNC:
+    def on_startup(self, func: LIFESPAN_FUNC) -> LIFESPAN_FUNC:
         """
         注册一个启动时执行的函数
         """
-        self.startup_funcs.add(func)
-        return func
+        return self._lifespan.on_startup(func)
 
     @overrides(BaseDriver)
-    def on_shutdown(self, func: HOOK_FUNC) -> HOOK_FUNC:
+    def on_shutdown(self, func: LIFESPAN_FUNC) -> LIFESPAN_FUNC:
         """
         注册一个停止时执行的函数
         """
-        self.shutdown_funcs.add(func)
-        return func
+        return self._lifespan.on_shutdown(func)
 
     @overrides(BaseDriver)
     def run(self, *args, **kwargs):
@@ -85,16 +84,8 @@ class Driver(BaseDriver):
         await self._shutdown()
 
     async def _startup(self):
-        # run startup
-        cors = [
-            cast(Callable[..., Awaitable[None]], startup)()
-            if is_coroutine_callable(startup)
-            else run_sync(startup)()
-            for startup in self.startup_funcs
-        ]
-        if cors:
         try:
-                await asyncio.gather(*cors)
+            await self._lifespan.startup()
         except Exception as e:
             logger.opt(colors=True, exception=e).error(
                 "<r><bg #f8bbd0>Error when running startup function. "
@@ -110,16 +101,9 @@ class Driver(BaseDriver):
         logger.info("Shutting down")
 
         logger.info("Waiting for application shutdown.")
-        # run shutdown
-        cors = [
-            cast(Callable[..., Awaitable[None]], shutdown)()
-            if is_coroutine_callable(shutdown)
-            else run_sync(shutdown)()
-            for shutdown in self.shutdown_funcs
-        ]
-        if cors:
+
         try:
-                await asyncio.gather(*cors)
+            await self._lifespan.shutdown()
         except Exception as e:
             logger.opt(colors=True, exception=e).error(
                 "<r><bg #f8bbd0>Error when running shutdown function. "

nonebot/drivers/quart.py

@@ -37,7 +37,7 @@ try:
     from quart import Quart, Request, Response
     from quart.datastructures import FileStorage
     from quart import Websocket as QuartWebSocket
-except ImportError as e:  # pragma: no cover
+except ModuleNotFoundError as e:  # pragma: no cover
     raise ImportError(
         "Please install Quart by using `pip install nonebot2[quart]`"
     ) from e

nonebot/drivers/websockets.py

@@ -30,7 +30,7 @@ from nonebot.drivers import ForwardMixin, ForwardDriver, combine_driver
 try:
     from websockets.exceptions import ConnectionClosed
     from websockets.legacy.client import Connect, WebSocketClientProtocol
-except ImportError as e:  # pragma: no cover
+except ModuleNotFoundError as e:  # pragma: no cover
     raise ImportError(
         "Please install websockets by using `pip install nonebot2[websockets]`"
     ) from e

tests/test_driver.py

@@ -12,6 +12,7 @@ from nonebot.params import Depends
 from nonebot import _resolve_combine_expr
 from nonebot.dependencies import Dependent
 from nonebot.exception import WebSocketClosed
+from nonebot.drivers._lifespan import Lifespan
 from nonebot.drivers import (
     URL,
     Driver,
@@ -36,6 +37,39 @@ def load_driver(request: pytest.FixtureRequest) -> Driver:
     return DriverClass(Env(environment=global_driver.env), global_driver.config)
 
 
+@pytest.mark.asyncio
+async def test_lifespan():
+    lifespan = Lifespan()
+
+    start_log = []
+    shutdown_log = []
+
+    @lifespan.on_startup
+    async def _startup1():
+        assert start_log == []
+        start_log.append(1)
+
+    @lifespan.on_startup
+    async def _startup2():
+        assert start_log == [1]
+        start_log.append(2)
+
+    @lifespan.on_shutdown
+    async def _shutdown1():
+        assert shutdown_log == []
+        shutdown_log.append(1)
+
+    @lifespan.on_shutdown
+    async def _shutdown2():
+        assert shutdown_log == [1]
+        shutdown_log.append(2)
+
+    async with lifespan:
+        assert start_log == [1, 2]
+
+    assert shutdown_log == [1, 2]
+
+
 @pytest.mark.asyncio
 @pytest.mark.parametrize(
     "driver",