Recommended way to run background tasks

[arlyon]

aiohttp/examples/background_tasks.py

Line 46 in 3a65252

app['redis_listener'] = app.loop.create_task(listen_to_redis(app))

The loop property on the Application class is now deprecated (#3374), but the docs still reference adding background tasks to the loop via this property. What is the recommended way to do that now?

[kxepal]

aiojobs perfectly handles this problem.

[aio-libs-bot]

GitMate.io thinks the contributors most likely able to help are @asvetlov, and @aio-libs-bot.

Possibly related issues are #2246 (What's the recommended way of passing information to middlewares), #1104 (Rewrite doc section about background tasks), #3401 (Run background task in master process?), #2375 (add a way to run an app asynchron), and #2745 (Running out of memory ).

[arlyon]

Great, should I update the docs to make mention of this, and remove the current (deprecated) method?

[kxepal]

I don't think that the current method should be removed since it's works out of the box, but it might be good to mention how aiojobs may help there and why it's better. @asvetlov, what do you think about that?

[asvetlov]

aiojobs is referenced at the begin of https://docs.aiohttp.org/en/stable/web_advanced.html

Deprecated app.loop usage should be removed from docs, sure.
The question is what is a replacement?
In Python 3.7+ there is a bare asyncio.create_task() but older pythons should use loop.create_task() with getting a loop instance by asyncio.get_event_loop().
I prefer Python 3.7 approach personally but will we confuse people?

[asvetlov]

Doc is fixed by #3529

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