[Bug 789843] API: GstPromise - object with promise/future-like semantics

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=789843

--- Comment #12 from Matthew Waters (ystreet00) <ystreet00 at gmail.com> ---
(In reply to Sebastian Dröge (slomo) from comment #11)
> (In reply to Matthew Waters (ystreet00) from comment #10)
> > > @@ +45,3 @@
> > > +  GST_PROMISE_RESULT_INTERRUPTED,
> > > +  GST_PROMISE_RESULT_REPLIED,
> > > +  GST_PROMISE_RESULT_EXPIRED,
> > > 
> > > It might be good to also add an ERROR case here, and allow to get/pass a
> > > GError in that case. Everything can fail
> > 
> > I don't believe any of the promise functionality has the potential to fail
> > without a warn/critical.  Did you have a specific case in mind where this is
> > not the case?
> 
> Not the promise infrastructure, but an actual promise itself. It's similar
> to expired, but with a real error. Constructed example: Say you promise to
> produce some information that requires you to talk to the network, but then
> DNS resolution fails and you can't provide that information anymore. What
> would happen then? Ideally you'd like to tell the consumer that the promise
> is never going to be fulfilled anymore and that there was this specific
> error.
> 
> Note also that the promises in GIO are all fallible (GAsyncResult / GTask).

An error is still a reply so this boils down to nothing changing.

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