4c9c75a2a6
This reverts commit d4089cae47334a4228b69d6bb23f2e49ebb7496e. Reason for revert: Breaks chromium WPT that is timing sensitive to onicegatheringstatechanges. This CL accidentally moved the MaybeStartGatheringIceCandidates to after completing the SLD call. The fix is to move it back. I'll do that in a re-land. Original change's description: > [Perfect Negotiation] Implement non-racy version of SetLocalDescription. > > BACKGROUND > > When SLD is invoked with SetSessionDescriptionObserver, the observer is > called by posting a message back to the execution thread, delaying the > call. This delay is "artificial" - it's not necessary; the operation is > already complete. It's a post from the signaling thread to the signaling > thread. The rationale for the post was to avoid the observer making > recursive calls back into the PeerConnection. The problem with this is > that by the time the observer is called, the PeerConnection could > already have executed other operations and modified its states. > > This causes the referenced bug: one can have a race where SLD is > resolved "too late" (after a pending SRD is executed) and the signaling > state observed when SLD resolves doesn't make sense. > > When implementing Unified Plan, we fixed similar issues for SRD by > adding a version that takes SetRemoteDescriptionObserverInterface as > argument instead of SetSessionDescriptionObserver. The new version did > not have the delay. The old version had to be kept around not to break > downstream projects that had dependencies both on he delay and on > allowing the PC to be destroyed midst-operation without informing its > observers. > > THIS CL > > This does the old SRD fix for SLD as well: A new observer interface is > added, SetLocalDescriptionObserverInterface, and > PeerConnection::SetLocalDescription() is overloaded. If you call it with > the old observer, you get the delay, but if you call it with the new > observer, you don't get a delay. > > - SetLocalDescriptionObserverInterface is added. > - SetLocalDescription is overloaded. > - The adapter for SetSessionDescriptionObserver that causes the delay > previously only used for SRD is updated to handle both SLD and SRD. > - FakeSetLocalDescriptionObserver is added and > MockSetRemoteDescriptionObserver is renamed "Fake...". > > Bug: chromium:1071733 > Change-Id: I920368e648bede481058ac22f5b8794752a220b3 > Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/179100 > Commit-Queue: Henrik Boström <hbos@webrtc.org> > Reviewed-by: Harald Alvestrand <hta@webrtc.org> > Cr-Commit-Position: refs/heads/master@{#31798} TBR=hbos@webrtc.org,hta@webrtc.org Change-Id: Ie1e1ecc49f3b1d7a7e230db6d36decbc4cbe8c86 No-Presubmit: true No-Tree-Checks: true No-Try: true Bug: chromium:1071733 Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/180480 Reviewed-by: Henrik Boström <hbos@webrtc.org> Commit-Queue: Henrik Boström <hbos@webrtc.org> Cr-Commit-Position: refs/heads/master@{#31802}
How to write code in the api/ directory
Mostly, just follow the regular style guide, but:
- Note that
api/code is not exempt from the “.hand.ccfiles come in pairs” rule, so if you declare something inapi/path/to/foo.h, it should be defined inapi/path/to/foo.cc. - Headers in
api/should, if possible, not#includeheaders outsideapi/. It’s not always possible to avoid this, but be aware that it adds to a small mountain of technical debt that we’re trying to shrink. .ccfiles inapi/, on the other hand, are free to#includeheaders outsideapi/.
That is, the preferred way for api/ code to access non-api/ code is to call
it from a .cc file, so that users of our API headers won’t transitively
#include non-public headers.
For headers in api/ that need to refer to non-public types, forward
declarations are often a lesser evil than including non-public header files. The
usual rules still apply, though.
.cc files in api/ should preferably be kept reasonably small. If a
substantial implementation is needed, consider putting it with our non-public
code, and just call it from the api/ .cc file.