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platform-external-webrtc/api/peer_connection_proxy.h
Henrik Boström 831ae4ef65 Reland "[Perfect Negotiation] Implement non-racy version of SetLocalDescription." 
This is a reland of d4089cae47334a4228b69d6bb23f2e49ebb7496e
with the following fix:

Invoke MaybeStartGathering as the last step of DoSetLocalDescription.
This ensures that candidates and onicegatheringstatechange does not
happen before SLD is resolved. This is important for passing
external/wpt/webrtc/RTCPeerConnection-iceGatheringState.html.

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=hta@webrtc.org

Bug: chromium:1071733
Change-Id: Ic6e8d96afa1c19604762f373716c08dbfa9d178c
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/180481
Commit-Queue: Henrik Boström <hbos@webrtc.org>
Reviewed-by: Henrik Boström <hbos@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#31804}
2020-07-29 11:27:43 +00:00

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/*
* Copyright 2012 The WebRTC project authors. All Rights Reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
#ifndef API_PEER_CONNECTION_PROXY_H_
#define API_PEER_CONNECTION_PROXY_H_
#include <memory>
#include <string>
#include <vector>
#include "api/peer_connection_interface.h"
#include "api/proxy.h"
namespace webrtc {
// TODO(deadbeef): Move this to .cc file and out of api/. What threads methods
// are called on is an implementation detail.
BEGIN_SIGNALING_PROXY_MAP(PeerConnection)
PROXY_SIGNALING_THREAD_DESTRUCTOR()
PROXY_METHOD0(rtc::scoped_refptr<StreamCollectionInterface>, local_streams)
PROXY_METHOD0(rtc::scoped_refptr<StreamCollectionInterface>, remote_streams)
PROXY_METHOD1(bool, AddStream, MediaStreamInterface*)
PROXY_METHOD1(void, RemoveStream, MediaStreamInterface*)
PROXY_METHOD2(RTCErrorOr<rtc::scoped_refptr<RtpSenderInterface>>,
AddTrack,
rtc::scoped_refptr<MediaStreamTrackInterface>,
const std::vector<std::string>&)
PROXY_METHOD1(bool, RemoveTrack, RtpSenderInterface*)
PROXY_METHOD1(RTCError, RemoveTrackNew, rtc::scoped_refptr<RtpSenderInterface>)
PROXY_METHOD1(RTCErrorOr<rtc::scoped_refptr<RtpTransceiverInterface>>,
AddTransceiver,
rtc::scoped_refptr<MediaStreamTrackInterface>)
PROXY_METHOD2(RTCErrorOr<rtc::scoped_refptr<RtpTransceiverInterface>>,
AddTransceiver,
rtc::scoped_refptr<MediaStreamTrackInterface>,
const RtpTransceiverInit&)
PROXY_METHOD1(RTCErrorOr<rtc::scoped_refptr<RtpTransceiverInterface>>,
AddTransceiver,
cricket::MediaType)
PROXY_METHOD2(RTCErrorOr<rtc::scoped_refptr<RtpTransceiverInterface>>,
AddTransceiver,
cricket::MediaType,
const RtpTransceiverInit&)
PROXY_METHOD2(rtc::scoped_refptr<RtpSenderInterface>,
CreateSender,
const std::string&,
const std::string&)
PROXY_CONSTMETHOD0(std::vector<rtc::scoped_refptr<RtpSenderInterface>>,
GetSenders)
PROXY_CONSTMETHOD0(std::vector<rtc::scoped_refptr<RtpReceiverInterface>>,
GetReceivers)
PROXY_CONSTMETHOD0(std::vector<rtc::scoped_refptr<RtpTransceiverInterface>>,
GetTransceivers)
PROXY_METHOD3(bool,
GetStats,
StatsObserver*,
MediaStreamTrackInterface*,
StatsOutputLevel)
PROXY_METHOD1(void, GetStats, RTCStatsCollectorCallback*)
PROXY_METHOD2(void,
GetStats,
rtc::scoped_refptr<RtpSenderInterface>,
rtc::scoped_refptr<RTCStatsCollectorCallback>)
PROXY_METHOD2(void,
GetStats,
rtc::scoped_refptr<RtpReceiverInterface>,
rtc::scoped_refptr<RTCStatsCollectorCallback>)
PROXY_METHOD0(void, ClearStatsCache)
PROXY_METHOD2(rtc::scoped_refptr<DataChannelInterface>,
CreateDataChannel,
const std::string&,
const DataChannelInit*)
PROXY_CONSTMETHOD0(const SessionDescriptionInterface*, local_description)
PROXY_CONSTMETHOD0(const SessionDescriptionInterface*, remote_description)
PROXY_CONSTMETHOD0(const SessionDescriptionInterface*,
current_local_description)
PROXY_CONSTMETHOD0(const SessionDescriptionInterface*,
current_remote_description)
PROXY_CONSTMETHOD0(const SessionDescriptionInterface*,
pending_local_description)
PROXY_CONSTMETHOD0(const SessionDescriptionInterface*,
pending_remote_description)
PROXY_METHOD0(void, RestartIce)
PROXY_METHOD2(void,
CreateOffer,
CreateSessionDescriptionObserver*,
const RTCOfferAnswerOptions&)
PROXY_METHOD2(void,
CreateAnswer,
CreateSessionDescriptionObserver*,
const RTCOfferAnswerOptions&)
PROXY_METHOD2(void,
SetLocalDescription,
std::unique_ptr<SessionDescriptionInterface>,
rtc::scoped_refptr<SetLocalDescriptionObserverInterface>)
PROXY_METHOD1(void,
SetLocalDescription,
rtc::scoped_refptr<SetLocalDescriptionObserverInterface>)
PROXY_METHOD2(void,
SetLocalDescription,
SetSessionDescriptionObserver*,
SessionDescriptionInterface*)
PROXY_METHOD1(void, SetLocalDescription, SetSessionDescriptionObserver*)
PROXY_METHOD2(void,
SetRemoteDescription,
std::unique_ptr<SessionDescriptionInterface>,
rtc::scoped_refptr<SetRemoteDescriptionObserverInterface>)
PROXY_METHOD2(void,
SetRemoteDescription,
SetSessionDescriptionObserver*,
SessionDescriptionInterface*)
PROXY_METHOD0(PeerConnectionInterface::RTCConfiguration, GetConfiguration)
PROXY_METHOD1(RTCError,
SetConfiguration,
const PeerConnectionInterface::RTCConfiguration&)
PROXY_METHOD1(bool, AddIceCandidate, const IceCandidateInterface*)
PROXY_METHOD2(void,
AddIceCandidate,
std::unique_ptr<IceCandidateInterface>,
std::function<void(RTCError)>)
PROXY_METHOD1(bool, RemoveIceCandidates, const std::vector<cricket::Candidate>&)
PROXY_METHOD1(RTCError, SetBitrate, const BitrateSettings&)
PROXY_METHOD1(void, SetAudioPlayout, bool)
PROXY_METHOD1(void, SetAudioRecording, bool)
PROXY_METHOD1(rtc::scoped_refptr<DtlsTransportInterface>,
LookupDtlsTransportByMid,
const std::string&)
PROXY_CONSTMETHOD0(rtc::scoped_refptr<SctpTransportInterface>, GetSctpTransport)
PROXY_METHOD0(SignalingState, signaling_state)
PROXY_METHOD0(IceConnectionState, ice_connection_state)
PROXY_METHOD0(IceConnectionState, standardized_ice_connection_state)
PROXY_METHOD0(PeerConnectionState, peer_connection_state)
PROXY_METHOD0(IceGatheringState, ice_gathering_state)
PROXY_METHOD0(absl::optional<bool>, can_trickle_ice_candidates)
PROXY_METHOD1(void, AddAdaptationResource, rtc::scoped_refptr<Resource>)
PROXY_METHOD2(bool,
StartRtcEventLog,
std::unique_ptr<RtcEventLogOutput>,
int64_t)
PROXY_METHOD1(bool, StartRtcEventLog, std::unique_ptr<RtcEventLogOutput>)
PROXY_METHOD0(void, StopRtcEventLog)
PROXY_METHOD0(void, Close)
END_PROXY_MAP()
} // namespace webrtc
#endif // API_PEER_CONNECTION_PROXY_H_
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