Add very basic PageCache support for RTCPeerConnection

[Chris Dumez]

Add very basic PageCache support for RTCPeerConnection.

[Chris Dumez]

Created attachment 379588 [details]
Patch

[Radar WebKit Bug Importer]

<rdar://problem/55723524>

[Alex Christensen]

Comment on attachment 379588 [details]
Patch

View in context: https://bugs.webkit.org/attachment.cgi?id=379588&action=review

> Source/WebCore/Modules/mediastream/RTCPeerConnection.h:190
> +        promise.whenSettled([pendingActivity = makeRefPtr(makePendingActivity(*this).ptr())] { });

Why not just make whenSettled take a WTF::Function?

[Chris Dumez]

Created attachment 379613 [details]
Patch

[Geoffrey Garen]

Comment on attachment 379613 [details]
Patch

View in context: https://bugs.webkit.org/attachment.cgi?id=379613&action=review

r=me

> Source/WebCore/Modules/mediastream/RTCPeerConnection.cpp:502
> +    // FIXME: We should do better here, it is way too easy to prevent PageCache.
>  bool RTCPeerConnection::canSuspendForDocumentSuspension() const
>  {
>      return !hasPendingActivity();

I kinda think we should be able to remove this. Pending promised will be resolved before any navigation. And events are OK to delay.

[Chris Dumez]

(In reply to Geoffrey Garen from comment #5)
> Comment on attachment 379613 [details]
> Patch
> 
> View in context:
> https://bugs.webkit.org/attachment.cgi?id=379613&action=review
> 
> r=me
> 
> > Source/WebCore/Modules/mediastream/RTCPeerConnection.cpp:502
> > +    // FIXME: We should do better here, it is way too easy to prevent PageCache.
> >  bool RTCPeerConnection::canSuspendForDocumentSuspension() const
> >  {
> >      return !hasPendingActivity();
> 
> I kinda think we should be able to remove this. Pending promised will be
> resolved before any navigation. And events are OK to delay.

Promises are guaranteed to be resolved before navigating away? What if I call a JS function that returns a promise from inside the pagehide event handler?

[Geoffrey Garen]

> Promises are guaranteed to be resolved before navigating away? What if I
> call a JS function that returns a promise from inside the pagehide event
> handler?

Maybe I misread this code. I guess this is a set of promises that will resolve when future events happen? Yeah, I guess we would need to implement an explicit way to delay them if so.

[WebKit Commit Bot]

Comment on attachment 379613 [details]
Patch

Clearing flags on attachment: 379613

Committed r250379: <https://trac.webkit.org/changeset/250379>

[WebKit Commit Bot]

All reviewed patches have been landed.  Closing bug.