pytinstrument does not track the call stack of __aenter__ and __aexit__

[Whisht]

I am using pyinstrument to track an async code with aiohttp. My purpose is that to analyze why my custom __aexit__() is not called, but there are no record about my custom code whether __aenter__() or __aexit__().

Here is my code named test_aio.py, this is the correct version where I manually call __aenter__ and __aexit__.

import asyncio, aiohttp

class AioHttpSession:
    def __init__(self) -> None:
        self._session = None

    async def __aenter__(self):
        if self._session is None:
            self._session = await aiohttp.ClientSession().__aenter__()
        return self

    async def __aexit__(self):
        if self._session is None:
            raise RuntimeError("session it not initilaized")
        await self._session.__aexit__(None, None, None)

    async def request(self, url="http://www.baidu.com"):
        if self._session is None:
            await self.__aenter__()
        async with self._session.get(url) as response:
            data = await response.text()
            print(self._session)
            return data

class MyAPP:
    def __init__(self) -> None:
        self.client = AioHttpSession()

    async def fetch(self):
        session = await self.client.__aenter__()
        try:
            resp = await session.request()
            return resp
        except Exception as e:
            if resp is not None:
                await resp.release()
            await session.__aexit__(None, None, None)
            raise

async def main():
    app = MyAPP()
    tasks = [app.fetch() for _ in range(3)]
    res = await asyncio.gather(*tasks)
    await app.client.__aexit__()

asyncio.run(main())

And I run pyinstrument with pyinstrument --show-all test_aio.py. But no called information about AioHttpSession.__aenter__() or `aexit().

[joerick]

To track time spent in awaits, you have to start the profiler inside the async task you're interested in. You can't use the command-line style.