似乎不支持ASGI“寿命"协议 [英] ASGI 'lifespan' protocol appears unsupported

问题描述

我有一个在fastapi&上运行的异步代码.档案我正在尝试从.json文件加载并保存我的信息，但是每次我关闭该程序时，它仅保存字典的键，并向我显示"ASGI'lifespan'协议似乎不受支持".按摩

I have an asynchronous code running on fastapi & aiofiles i'm trying to load and save my info from a .json file but every time I shut down the program, it save only the keys of the dict and showing me "ASGI 'lifespan' protocol appears unsupported" massage

这是我的打开/关闭部分:

this is my turn on/off part:

@app.on_event("startup")
async def startup_event():
    global beers
    try:
        async with aiofiles.open("data.json", mode='r+', json=True) as file:
            beers = await file.read()
    except:
        beers = {}


@app.on_event("shutdown")
async def on_exit_app():
    async with aiofiles.open("data.json", "w+") as outfile:
        await outfile.write(beers)

有什么问题吗?

推荐答案

此99％表示 on_event("shutdown"))函数中的某些内容引发了错误，而该错误并未被服务器(FastAPI/Starlette)，应用崩溃，而不是正常结束.这使uvicorn认为服务器不支持ASGI协议的有效期部分.

This 99% means that something in the on_event("shutdown") function throws an error that isn't caught by the server (FastAPI/Starlette), and the app crashes, instead of ending properly. This leads uvicorn to believe that the server doesn't support the livespan part of the ASGI protocol.

如果您运行带有附加选项-lifespan on 的 uvicorn ，则会显示该错误，您可以对其进行调试.

If you run uvicorn with additional option --lifespan on, the error will be shown and you can debug it.

请参见 Starlette错误报告.

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