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📝 Add note for fastapi_reload option on Windows @CherryGS (#830)

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* 添加 `fastapi_reload` 在 win 的额外影响

* 🚨 auto fix by pre-commit hooks

* Update choose-driver.md

* 🚨 auto fix by pre-commit hooks

* 调整格式

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* Update website/versioned_docs/version-2.0.0-beta.2/tutorial/choose-driver.md

Co-authored-by: Mix <32300164+mnixry@users.noreply.github.com>

* Update website/versioned_docs/version-2.0.0-beta.2/tutorial/choose-driver.md

Co-authored-by: Mix <32300164+mnixry@users.noreply.github.com>

* Update website/versioned_docs/version-2.0.0-beta.2/tutorial/choose-driver.md

Co-authored-by: Mix <32300164+mnixry@users.noreply.github.com>

* Update website/versioned_docs/version-2.0.0-beta.2/tutorial/choose-driver.md

Co-authored-by: Mix <32300164+mnixry@users.noreply.github.com>

* Update website/versioned_docs/version-2.0.0-beta.2/tutorial/choose-driver.md

Co-authored-by: Mix <32300164+mnixry@users.noreply.github.com>

* Update choose-driver.md

* Update choose-driver.md

* 📝 update reload warning

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Co-authored-by: Mix <32300164+mnixry@users.noreply.github.com>
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CherryGS
2022-02-22 23:10:18 +08:00
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website/docs/tutorial/choose-driver.md
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@@ -99,6 +99,29 @@ app = nonebot.get_asgi()
nonebot.run(app="bot:app")
```
:::warning 警告
在 Windows 平台上开启该功能有可能会造成预料之外的影响！
在 `Python>=3.8` 环境下开启该功能后，在 uvicorn 运行时（FastAPI 提供的 ASGI 底层，即 reload 功能的实际来源），asyncio 使用的事件循环会被 uvicorn 从默认的 `ProactorEventLoop` 强制切换到 `SelectorEventLoop`
> 相关信息参考 [uvicorn#529](https://github.com/encode/uvicorn/issues/529)，[uvicorn#1070](https://github.com/encode/uvicorn/pull/1070)，[uvicorn#1257](https://github.com/encode/uvicorn/pull/1257)
后者（`SelectorEventLoop`）在 Windows 平台的可使用性不如前者（`ProactorEventLoop`），包括但不限于
1. 不支持创建子进程
2. 最多只支持 512 个套接字
3. ...
> 具体信息参考 [Python 文档](https://docs.python.org/zh-cn/3/library/asyncio-platforms.html#windows)
所以，一些使用了 asyncio 的库因此可能无法正常工作，如：
1. [playwright](https://playwright.dev/python/docs/intro#incompatible-with-selectoreventloop-of-asyncio-on-windows)
如果在开启该功能后，原本**正常运行**的代码报错，且打印的异常堆栈信息和 asyncio 有关（异常一般为 `NotImplementedError`），
你可能就需要考虑相关库对事件循环的支持，以及是否启用该功能
:::
##### `fastapi_reload_dirs`
类型：`Optional[List[str]]`