Re: Canceling pending getUserMedia() call

On Mon, Apr 27, 2015 at 5:15 AM, Jan-Ivar Bruaroey <jib@mozilla.com> wrote:

>  What happened to "a more general discussion [...] about permissions and
> what APIs we should offer around them"? - We seem to have moved on to where
> to stick the API (which is irresistible, so I'll jump in).
>
> Can we sidestep the whole fetch debate with:
> navigator.mediaDevices.cancelOutstandingGumRequests() ?
>

This seems like an unwarranted piece of special casing.


Making promises cancellable is a terrible idea, because a promise can be
> passed around to several functions without granting control to any of them.
> Nevermind that any function acting on said control would affect all the
> other ones (action-at-a-distance). Control has to live upstream in the
> tree, and it's not for the recipient of a promise to break, resolve or
> reject it.
>

Without taking a position on the merits of it, it seems like cancellable
promises are likely coming, so we might as well use them.

-Ekr


> On 4/26/15 3:46 PM, Eric Rescorla wrote:
>
> Indeed. This seems to be a more complicated topic than one might wish:
>
>  https://github.com/whatwg/fetch/issues/27
>
>
>
> On Sun, Apr 26, 2015 at 8:16 AM, Harald Alvestrand <harald@alvestrand.no>
> wrote:
>
>> Den 24. april 2015 20:02, skrev Cullen Jennings (fluffy):
>> >
>> > Just popping this up to top of stack - it did not seem we have figured
>> out how to resolve this yet and I will note it has been opened as
>> >
>> > https://github.com/w3c/mediacapture-main/issues/127
>>
>>
>> It is noted.
>>
>> The conclusion from the discussion was that the common desire was for
>> cancellation not timeout, but that there was that there is no common
>> pattern defined in the W3C ecosystem for cancelling a promise yet.
>>
>> >
>> >
>> >
>> >> On Jan 27, 2015, at 3:25 PM, Iñaki Baz Castillo <ibc@aliax.net> wrote:
>> >>
>> >> Hi, let's assume that during a call/session a peer wants to add his
>> >> local video so gUM is called. But before he accepts the gUM prompt the
>> >> call/session is ended by the remote peer.
>> >>
>> >> Is there anyway to make the pending gUM prompt to disappear? I mean:
>> >> without waiting for the user to press "Accept" and then ignoring and
>> >> closing the given MediaStream.
>> >>
>> >> In that scenario and given that the user does know that the
>> >> call/session has ended, he may prefer to click on "Deny" (why to open
>> >> my webcam when the call has already ended?), which would cause the
>> >> website to get into the gUM blacklist of the browser.
>> >>
>> >> Found nothing in the spec.
>> >>
>> >> --
>> >> Iñaki Baz Castillo
>> >> <ibc@aliax.net>
>> >>
>> >>
>>
>
>