connection timed out after few minutes

[gencer]

I have a definition like this:

 while True:
        if not websocket.open:
            await req.close()
            return
            message = await websocket.recv()

And few minutes later if i stay idle i get this on server and disconnect user:

  File "/usr/lib/python3.5/asyncio/selector_events.py", line 662, in _read_ready
    data = self._sock.recv(self.max_size)
TimeoutError: [Errno 110] Connection timed out

How can avoid this and stay connected as long as possible?

[aaugustin]

You should wrap await websocket.recv() in a task with a timeout. asyncio provides APIs for that.

If the timeout is reached, await websocket.ping() and let while True loop resume.

I suggest using 25 seconds for the timeout as many systems close idle connections after 30 seconds.

(I'm interested in hearing whether that solution actually works. Perhaps I should document it better.)

[gencer]

@aaugustin are you talking about asyncio.timeout(timeout, *, loop=None) ? Perhaps an example for your suggestion :)

[aaugustin]

Yes, that's the easier way to achieve the desired timeout here.

I thought it was added in Python 3.5 but apparently it also exists in 3.4 (and I don't think 3.3 matters much these days).

[gencer]

My python version is 3.5 so, It won't be a problem for me. I will test this ASAP.
--Which is i cannot find any example on anywhere yet :)
Thanks!

[gencer]

I solved this issue as you suggested.

Thanks.

Case closed now.

[aaugustin]

Actually I'd like to keep this issue around to check if I can improve documentation.

[gencer]

@aaugustin: Actually i'll (and others) appreciate if you can document this subject as you stated. In fact, I fixed already but still need some document to check if i did the correct way.

[aaugustin]

This will be built-in if #449 gets merged.