On Mon, Feb 11, 2013 at 2:23 PM, Saúl Ibarra Corretgé
I think there are actually two cases: where stop() is called from the task given to run_until_complete(), or from another task. In the former case, because the exception bubbles out of the task's coroutine, the task will be marked as done (and its exception set to _StopError) -- at least I think so. In the latter case, the task will still be runnable, and it will continue to run when the event loop is started again. (Hm... maybe run_forever() should be called start(), to match stop()?)
I think your unittest only tests the former case.
Well, I think they are actually the same. In the gist I posted earlier I called loop.stop(), I didn't raise the exception inside the task, and loop.stop() will call call_soon so the actual raising will happen in the context on _run_once unless I'm mistaken.
Oh, you're right! Not my day for reading carefully. :-)
Here is an updated simple test with it's output: https://gist.github.com/saghul/4758151
I'm not sure what run_until_complete() should return in the latter case.
In fact it makes me doubt the behavior of run_until_complete() in general. Maybe it should return the Future (although that's kind of redundant)? Or an enum indicating what happened? (Cases would be result, exception, timeout, running -- and maybe cancelled?)
I think the current behavior is ok, it the user really wants to check if the future was actually completed she can check with done(), if she saved the future in a variable, that is.
My other preferred approach would be to raise an exception, since I consider this an exceptional case: I told the loop to run until this future is completed so I expect that to happen. Since it didn't, NotCompletedError (or something alike) sounds good to me.
Good. How about calling future.result(), and letting it raise InvalidStateError ? (Except if the timeout handler was called.) -- --Guido van Rossum (python.org/~guido)