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Re: asyncio - how to stop background task cleanly

From "Frank Millman" <frank@chagford.com>
Newsgroups comp.lang.python
Subject Re: asyncio - how to stop background task cleanly
Date 2016-02-07 07:27 +0200
Message-ID <mailman.60.1454822852.2317.python-list@python.org> (permalink)
References <mailman.32.1454746369.2317.python-list@python.org> <87lh6ys052.fsf@elektro.pacujo.net> <mailman.41.1454767329.2317.python-list@python.org> <87fux5svhk.fsf@elektro.pacujo.net> <8737t5shhp.fsf@elektro.pacujo.net>

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"Marko Rauhamaa"  wrote in message news:8737t5shhp.fsf@elektro.pacujo.net...
> >
> Actually, cancellation is specially supported in asyncio (<URL:
> https://docs.python.org/3/library/asyncio-task.html#asyncio.Task.cancel>)
> so this should do:
>
>     async def background_task():
>         while True:
>             await perform_task()
>             await asyncio.sleep(10)
>

That's exactly what I needed - thanks, Marko

    async def background_task()
        try:
            while True:
                await perform_task()
                await asyncio.sleep(10)
        except asyncio.CancelledError:
                await perform_cleanup()

At startup -

    task = asyncio.ensure_future(background_task())

At shutdown -

    task.cancel()
    await asyncio.wait([task])

Works perfectly - thanks again.

Frank

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Thread

asyncio - how to stop background task cleanly "Frank Millman" <frank@chagford.com> - 2016-02-06 09:55 +0200
  Re: asyncio - how to stop background task cleanly Marko Rauhamaa <marko@pacujo.net> - 2016-02-06 10:39 +0200
    Re: asyncio - how to stop background task cleanly "Frank Millman" <frank@chagford.com> - 2016-02-06 16:01 +0200
      Re: asyncio - how to stop background task cleanly Marko Rauhamaa <marko@pacujo.net> - 2016-02-06 17:34 +0200
        Re: asyncio - how to stop background task cleanly Marko Rauhamaa <marko@pacujo.net> - 2016-02-06 22:37 +0200
          Re: asyncio - how to stop background task cleanly "Frank Millman" <frank@chagford.com> - 2016-02-07 07:27 +0200
          Re: asyncio - how to stop background task cleanly "Frank Millman" <frank@chagford.com> - 2016-02-07 09:10 +0200
            Re: asyncio - how to stop background task cleanly Marko Rauhamaa <marko@pacujo.net> - 2016-02-07 09:53 +0200
              Re: asyncio - how to stop background task cleanly "Frank Millman" <frank@chagford.com> - 2016-02-07 10:55 +0200
                Re: asyncio - how to stop background task cleanly Marko Rauhamaa <marko@pacujo.net> - 2016-02-07 11:27 +0200
                Re: asyncio - how to stop background task cleanly "Frank Millman" <frank@chagford.com> - 2016-02-07 12:20 +0200

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