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Revert "Implement rollback for setRemoteDescription"

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This reverts commit 16d4c4d4fb.

Reason for revert: breaks downstream dependency. (The new enum value kRollback is not handled correctly downstream).

Original change's description:
> Implement rollback for setRemoteDescription
> 
> Bug: chromium:980875
> Change-Id: I4575e9ad1902a20937f9812f49edee2a2441f76d
> Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/153525
> Commit-Queue: Eldar Rello <elrello@microsoft.com>
> Reviewed-by: Harald Alvestrand <hta@webrtc.org>
> Reviewed-by: Henrik Boström <hbos@webrtc.org>
> Reviewed-by: Steve Anton <steveanton@webrtc.org>
> Cr-Commit-Position: refs/heads/master@{#29422}

TBR=steveanton@webrtc.org,mbonadei@webrtc.org,aleloi@webrtc.org,hbos@webrtc.org,aleloi@google.com,hta@webrtc.org,shampson@webrtc.org,elrello@microsoft.com

Change-Id: If76f6b672fdc59b7f00dfc7c150abda16614cd04
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: chromium:980875
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/156304
Reviewed-by: Alex Loiko <aleloi@webrtc.org>
Commit-Queue: Alex Loiko <aleloi@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#29427}
This commit is contained in:
Alex Loiko 2019-10-10 09:08:55 +00:00 committed by Commit Bot
parent 28214cd9bf
commit 907f1548af
13 changed files with 20 additions and 471 deletions
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5
api/jsep.cc
View file

@ -41,7 +41,6 @@ void SetSessionDescriptionObserver::OnFailure(const std::string& error) {
const char SessionDescriptionInterface::kOffer[] = "offer";
const char SessionDescriptionInterface::kPrAnswer[] = "pranswer";
const char SessionDescriptionInterface::kAnswer[] = "answer";
const char SessionDescriptionInterface::kRollback[] = "rollback";
const char* SdpTypeToString(SdpType type) {
switch (type) {
@ -51,8 +50,6 @@ const char* SdpTypeToString(SdpType type) {
return SessionDescriptionInterface::kPrAnswer;
case SdpType::kAnswer:
return SessionDescriptionInterface::kAnswer;
case SdpType::kRollback:
return SessionDescriptionInterface::kRollback;
}
return "";
}
@ -64,8 +61,6 @@ absl::optional<SdpType> SdpTypeFromString(const std::string& type_str) {
return SdpType::kPrAnswer;
} else if (type_str == SessionDescriptionInterface::kAnswer) {
return SdpType::kAnswer;
} else if (type_str == SessionDescriptionInterface::kRollback) {
return SdpType::kRollback;
} else {
return absl::nullopt;
}

8
api/jsep.h
View file

@ -103,11 +103,8 @@ enum class SdpType {
kOffer, // Description must be treated as an SDP offer.
kPrAnswer, // Description must be treated as an SDP answer, but not a final
// answer.
kAnswer, // Description must be treated as an SDP final answer, and the
// offer-answer exchange must be considered complete after
// receiving this.
kRollback // Resets any pending offers and sets signaling state back to
// stable.
kAnswer // Description must be treated as an SDP final answer, and the offer-
// answer exchange must be considered complete after receiving this.
};
// Returns the string form of the given SDP type. String forms are defined in
@ -131,7 +128,6 @@ class RTC_EXPORT SessionDescriptionInterface {
static const char kOffer[];
static const char kPrAnswer[];
static const char kAnswer[];
static const char kRollback[];
virtual ~SessionDescriptionInterface() {}

3
api/peer_connection_interface.h
View file

@ -659,9 +659,6 @@ class RTC_EXPORT PeerConnectionInterface : public rtc::RefCountInterface {
// logs with TURN server logs. It will not be added if it's an empty string.
std::string turn_logging_id;
// Added to be able to control rollout of this feature.
bool enable_implicit_rollback = false;
//
// Don't forget to update operator== if adding something.
//

2
pc/jsep_session_description.cc
View file

@ -152,11 +152,9 @@ std::unique_ptr<SessionDescriptionInterface> CreateSessionDescription(
const std::string& sdp,
SdpParseError* error_out) {
auto jsep_desc = std::make_unique<JsepSessionDescription>(type);
if (type != SdpType::kRollback) {
if (!SdpDeserialize(sdp, jsep_desc.get(), error_out)) {
return nullptr;
}
}
return std::move(jsep_desc);
}

10
pc/jsep_transport_controller.cc
View file

@ -471,16 +471,6 @@ void JsepTransportController::SetMediaTransportSettings(
use_datagram_transport_for_data_channels_receive_only;
}
void JsepTransportController::RollbackTransportForMid(const std::string& mid) {
if (!network_thread_->IsCurrent()) {
network_thread_->Invoke<void>(RTC_FROM_HERE,
[=] { RollbackTransportForMid(mid); });
return;
}
RemoveTransportForMid(mid);
MaybeDestroyJsepTransport(mid);
}
std::unique_ptr<cricket::IceTransportInternal>
JsepTransportController::CreateIceTransport(const std::string transport_name,
bool rtcp) {

4
pc/jsep_transport_controller.h
View file

@ -239,10 +239,6 @@ class JsepTransportController : public sigslot::has_slots<> {
bool use_datagram_transport_for_data_channels,
bool use_datagram_transport_for_data_channels_receive_only);
// TODO(elrello): For now the rollback only removes mid to transport mapping
// and deletes unused transport, but doesn't consider anything more complex.
void RollbackTransportForMid(const std::string& mid);
// If media transport is present enabled and supported,
// when this method is called, it creates a media transport and generates its
// offer. The new offer is then returned, and the created media transport will

108
pc/peer_connection.cc
View file

@ -782,7 +782,6 @@ bool PeerConnectionInterface::RTCConfiguration::operator==(
absl::optional<CryptoOptions> crypto_options;
bool offer_extmap_allow_mixed;
std::string turn_logging_id;
bool enable_implicit_rollback;
};
static_assert(sizeof(stuff_being_tested_for_equality) == sizeof(*this),
"Did you add something to RTCConfiguration and forget to "
@ -848,8 +847,7 @@ bool PeerConnectionInterface::RTCConfiguration::operator==(
o.use_datagram_transport_for_data_channels_receive_only &&
crypto_options == o.crypto_options &&
offer_extmap_allow_mixed == o.offer_extmap_allow_mixed &&
turn_logging_id == o.turn_logging_id &&
enable_implicit_rollback == o.enable_implicit_rollback;
turn_logging_id == o.turn_logging_id;
}
bool PeerConnectionInterface::RTCConfiguration::operator!=(
@ -2259,23 +2257,6 @@ void PeerConnection::SetLocalDescription(
return;
}
// For SLD we support only explicit rollback.
if (desc->GetType() == SdpType::kRollback) {
if (IsUnifiedPlan()) {
RTCError error = Rollback();
if (error.ok()) {
PostSetSessionDescriptionSuccess(observer);
} else {
PostSetSessionDescriptionFailure(observer, std::move(error));
}
} else {
PostSetSessionDescriptionFailure(
observer, RTCError(RTCErrorType::UNSUPPORTED_OPERATION,
"Rollback not supported in Plan B"));
}
return;
}
RTCError error = ValidateSessionDescription(desc.get(), cricket::CS_LOCAL);
if (!error.ok()) {
std::string error_message = GetSetDescriptionErrorMessage(
@ -2648,24 +2629,7 @@ void PeerConnection::SetRemoteDescription(
RTCError(RTCErrorType::INTERNAL_ERROR, std::move(error_message)));
return;
}
if (IsUnifiedPlan()) {
if (configuration_.enable_implicit_rollback) {
if (desc->GetType() == SdpType::kOffer &&
signaling_state() == kHaveLocalOffer) {
Rollback();
}
}
// Explicit rollback.
if (desc->GetType() == SdpType::kRollback) {
observer->OnSetRemoteDescriptionComplete(Rollback());
return;
}
} else if (desc->GetType() == SdpType::kRollback) {
observer->OnSetRemoteDescriptionComplete(
RTCError(RTCErrorType::UNSUPPORTED_OPERATION,
"Rollback not supported in Plan B"));
return;
}
if (desc->GetType() == SdpType::kOffer) {
// Report to UMA the format of the received offer.
ReportSdpFormatReceived(*desc);
@ -3418,12 +3382,8 @@ PeerConnection::AssociateTransceiver(cricket::ContentSource source,
transceiver = CreateAndAddTransceiver(sender, receiver);
transceiver->internal()->set_direction(
RtpTransceiverDirection::kRecvOnly);
if (type == SdpType::kOffer) {
transceiver_stable_states_by_transceivers_[transceiver] =
TransceiverStableState(RtpTransceiverDirection::kRecvOnly,
absl::nullopt, absl::nullopt, true);
}
}
// Check if the offer indicated simulcast but the answer rejected it.
// This can happen when simulcast is not supported on the remote party.
if (SimulcastIsRejected(old_local_content, *media_desc)) {
@ -3456,20 +3416,6 @@ PeerConnection::AssociateTransceiver(cricket::ContentSource source,
return std::move(error);
}
}
if (type == SdpType::kOffer) {
// Make sure we don't overwrite existing stable states and that the
// state is really going to change when adding new record to the map.
auto it = transceiver_stable_states_by_transceivers_.find(transceiver);
if (it == transceiver_stable_states_by_transceivers_.end() &&
(transceiver->internal()->mid() != content.name ||
transceiver->internal()->mline_index() != mline_index)) {
transceiver_stable_states_by_transceivers_[transceiver] =
TransceiverStableState(transceiver->internal()->direction(),
transceiver->internal()->mid(),
transceiver->internal()->mline_index(), false);
}
}
// Associate the found or created RtpTransceiver with the m= section by
// setting the value of the RtpTransceiver's mid property to the MID of the m=
// section, and establish a mapping between the transceiver and the index of
@ -5891,7 +5837,6 @@ RTCError PeerConnection::UpdateSessionState(
} else {
RTC_DCHECK(type == SdpType::kAnswer);
ChangeSignalingState(PeerConnectionInterface::kStable);
transceiver_stable_states_by_transceivers_.clear();
}
// Update internal objects according to the session description's media
@ -7605,51 +7550,4 @@ bool PeerConnection::CheckIfNegotiationIsNeeded() {
return false;
}
RTCError PeerConnection::Rollback() {
auto state = signaling_state();
if (state != PeerConnectionInterface::kHaveLocalOffer &&
state != PeerConnectionInterface::kHaveRemoteOffer) {
return RTCError(RTCErrorType::INVALID_STATE,
"Called in wrong signalingState: " +
GetSignalingStateString(signaling_state()));
}
RTC_DCHECK_RUN_ON(signaling_thread());
RTC_DCHECK(IsUnifiedPlan());
for (auto&& transceivers_stable_state_pair :
transceiver_stable_states_by_transceivers_) {
auto transceiver = transceivers_stable_state_pair.first;
auto state = transceivers_stable_state_pair.second;
RTC_DCHECK(transceiver->internal()->mid().has_value());
std::string mid = transceiver->internal()->mid().value();
transport_controller_->RollbackTransportForMid(mid);
DestroyTransceiverChannel(transceiver);
if (state.newly_created()) {
// Remove added transceivers with no added track.
if (transceiver->internal()->sender()->track()) {
transceiver->internal()->set_created_by_addtrack(true);
} else {
int remaining_transceiver_count = 0;
for (auto&& t : transceivers_) {
if (t != transceiver) {
transceivers_[remaining_transceiver_count++] = t;
}
}
transceivers_.resize(remaining_transceiver_count);
}
}
transceiver->internal()->sender_internal()->set_transport(nullptr);
transceiver->internal()->receiver_internal()->set_transport(nullptr);
transceiver->internal()->set_direction(state.direction());
transceiver->internal()->set_mid(state.mid());
transceiver->internal()->set_mline_index(state.mline_index());
}
transceiver_stable_states_by_transceivers_.clear();
pending_local_description_.reset();
pending_remote_description_.reset();
ChangeSignalingState(PeerConnectionInterface::kStable);
return RTCError::OK();
}
} // namespace webrtc

35
pc/peer_connection.h
View file

@ -391,34 +391,6 @@ class PeerConnection : public PeerConnectionInternal,
FieldTrialFlag receive_only;
};
// Captures partial state to be used for rollback. Applicable only in
// Unified Plan.
class TransceiverStableState {
public:
TransceiverStableState() {}
TransceiverStableState(RtpTransceiverDirection direction,
absl::optional<std::string> mid,
absl::optional<size_t> mline_index,
bool newly_created)
: direction_(direction),
mid_(mid),
mline_index_(mline_index),
newly_created_(newly_created) {}
RtpTransceiverDirection direction() const { return direction_; }
absl::optional<std::string> mid() const { return mid_; }
absl::optional<size_t> mline_index() const { return mline_index_; }
bool newly_created() const { return newly_created_; }
private:
RtpTransceiverDirection direction_ = RtpTransceiverDirection::kRecvOnly;
absl::optional<std::string> mid_;
absl::optional<size_t> mline_index_;
// Indicates that the transceiver was created as part of applying a
// description to track potential need for removing transceiver during
// rollback.
bool newly_created_ = false;
};
// Implements MessageHandler.
void OnMessage(rtc::Message* msg) override;
@ -1193,7 +1165,6 @@ class PeerConnection : public PeerConnectionInternal,
void UpdateNegotiationNeeded();
bool CheckIfNegotiationIsNeeded();
RTCError Rollback();
sigslot::signal1<DataChannel*> SignalDataChannelCreated_
RTC_GUARDED_BY(signaling_thread());
@ -1315,11 +1286,7 @@ class PeerConnection : public PeerConnectionInternal,
RTC_GUARDED_BY(signaling_thread()); // A pointer is passed to senders_
rtc::scoped_refptr<RTCStatsCollector> stats_collector_
RTC_GUARDED_BY(signaling_thread());
// Holds changes made to transceivers during applying descriptors for
// potential rollback. Gets cleared once signaling state goes to stable.
std::map<rtc::scoped_refptr<RtpTransceiverProxyWithInternal<RtpTransceiver>>,
TransceiverStableState>
transceiver_stable_states_by_transceivers_;
std::vector<
rtc::scoped_refptr<RtpTransceiverProxyWithInternal<RtpTransceiver>>>
transceivers_; // TODO(bugs.webrtc.org/9987): Accessed on both signaling

84
pc/peer_connection_integrationtest.cc
View file

@ -230,7 +230,7 @@ class PeerConnectionWrapper : public webrtc::PeerConnectionObserver,
// will set the whole offer/answer exchange in motion. Just need to wait for
// the signaling state to reach "stable".
void CreateAndSetAndSignalOffer() {
auto offer = CreateOfferAndWait();
auto offer = CreateOffer();
ASSERT_NE(nullptr, offer);
EXPECT_TRUE(SetLocalDescriptionAndSendSdpMessage(std::move(offer)));
}
@ -302,13 +302,6 @@ class PeerConnectionWrapper : public webrtc::PeerConnectionObserver,
return ice_candidate_pair_change_history_;
}
// Every PeerConnection signaling state in order that has been seen by the
// observer.
std::vector<PeerConnectionInterface::SignalingState>
peer_connection_signaling_state_history() const {
return peer_connection_signaling_state_history_;
}
void AddAudioVideoTracks() {
AddAudioTrack();
AddVideoTrack();
@ -584,14 +577,6 @@ class PeerConnectionWrapper : public webrtc::PeerConnectionObserver,
network_manager()->set_mdns_responder(std::move(mdns_responder));
}
// Returns null on failure.
std::unique_ptr<SessionDescriptionInterface> CreateOfferAndWait() {
rtc::scoped_refptr<MockCreateSessionDescriptionObserver> observer(
new rtc::RefCountedObject<MockCreateSessionDescriptionObserver>());
pc()->CreateOffer(observer, offer_answer_options_);
return WaitForDescriptionFromObserver(observer);
}
private:
explicit PeerConnectionWrapper(const std::string& debug_name)
: debug_name_(debug_name) {}
@ -746,6 +731,14 @@ class PeerConnectionWrapper : public webrtc::PeerConnectionObserver,
ResetRtpReceiverObservers();
}
// Returns null on failure.
std::unique_ptr<SessionDescriptionInterface> CreateOffer() {
rtc::scoped_refptr<MockCreateSessionDescriptionObserver> observer(
new rtc::RefCountedObject<MockCreateSessionDescriptionObserver>());
pc()->CreateOffer(observer, offer_answer_options_);
return WaitForDescriptionFromObserver(observer);
}
// Returns null on failure.
std::unique_ptr<SessionDescriptionInterface> CreateAnswer() {
rtc::scoped_refptr<MockCreateSessionDescriptionObserver> observer(
@ -901,7 +894,6 @@ class PeerConnectionWrapper : public webrtc::PeerConnectionObserver,
void OnSignalingChange(
webrtc::PeerConnectionInterface::SignalingState new_state) override {
EXPECT_EQ(pc()->signaling_state(), new_state);
peer_connection_signaling_state_history_.push_back(new_state);
}
void OnAddTrack(rtc::scoped_refptr<RtpReceiverInterface> receiver,
const std::vector<rtc::scoped_refptr<MediaStreamInterface>>&
@ -1045,8 +1037,7 @@ class PeerConnectionWrapper : public webrtc::PeerConnectionObserver,
ice_gathering_state_history_;
std::vector<cricket::CandidatePairChangeEvent>
ice_candidate_pair_change_history_;
std::vector<PeerConnectionInterface::SignalingState>
peer_connection_signaling_state_history_;
webrtc::FakeRtcEventLogFactory* event_log_factory_;
rtc::AsyncInvoker invoker_;
@ -6000,61 +5991,6 @@ TEST_P(PeerConnectionIntegrationTest, OnIceCandidateError) {
caller()->error_event().host_candidate.find(":"));
}
TEST_F(PeerConnectionIntegrationTestUnifiedPlan,
AudioKeepsFlowingAfterImplicitRollback) {
PeerConnectionInterface::RTCConfiguration config;
config.sdp_semantics = SdpSemantics::kUnifiedPlan;
config.enable_implicit_rollback = true;
ASSERT_TRUE(CreatePeerConnectionWrappersWithConfig(config, config));
ConnectFakeSignaling();
caller()->AddAudioTrack();
callee()->AddAudioTrack();
caller()->CreateAndSetAndSignalOffer();
ASSERT_TRUE_WAIT(SignalingStateStable(), kDefaultTimeout);
MediaExpectations media_expectations;
media_expectations.ExpectBidirectionalAudio();
ASSERT_TRUE(ExpectNewFrames(media_expectations));
SetSignalIceCandidates(false); // Workaround candidate outrace sdp.
caller()->AddVideoTrack();
callee()->AddVideoTrack();
rtc::scoped_refptr<MockSetSessionDescriptionObserver> observer(
new rtc::RefCountedObject<MockSetSessionDescriptionObserver>());
callee()->pc()->SetLocalDescription(observer,
callee()->CreateOfferAndWait().release());
EXPECT_TRUE_WAIT(observer->called(), kDefaultTimeout);
caller()->CreateAndSetAndSignalOffer(); // Implicit rollback.
ASSERT_TRUE_WAIT(SignalingStateStable(), kDefaultTimeout);
ASSERT_TRUE(ExpectNewFrames(media_expectations));
}
TEST_F(PeerConnectionIntegrationTestUnifiedPlan,
ImplicitRollbackVisitsStableState) {
RTCConfiguration config;
config.sdp_semantics = SdpSemantics::kUnifiedPlan;
config.enable_implicit_rollback = true;
ASSERT_TRUE(CreatePeerConnectionWrappersWithConfig(config, config));
rtc::scoped_refptr<MockSetSessionDescriptionObserver> sld_observer(
new rtc::RefCountedObject<MockSetSessionDescriptionObserver>());
callee()->pc()->SetLocalDescription(sld_observer,
callee()->CreateOfferAndWait().release());
EXPECT_TRUE_WAIT(sld_observer->called(), kDefaultTimeout);
EXPECT_EQ(sld_observer->error(), "");
rtc::scoped_refptr<MockSetSessionDescriptionObserver> srd_observer(
new rtc::RefCountedObject<MockSetSessionDescriptionObserver>());
callee()->pc()->SetRemoteDescription(
srd_observer, caller()->CreateOfferAndWait().release());
EXPECT_TRUE_WAIT(srd_observer->called(), kDefaultTimeout);
EXPECT_EQ(srd_observer->error(), "");
EXPECT_THAT(callee()->peer_connection_signaling_state_history(),
ElementsAre(PeerConnectionInterface::kHaveLocalOffer,
PeerConnectionInterface::kStable,
PeerConnectionInterface::kHaveRemoteOffer));
}
INSTANTIATE_TEST_SUITE_P(PeerConnectionIntegrationTest,
PeerConnectionIntegrationTest,
Values(SdpSemantics::kPlanB,

216
pc/peer_connection_jsep_unittest.cc
View file

@ -1727,220 +1727,4 @@ TEST_F(PeerConnectionJsepTest, SetLocalDescriptionFailsMissingMid) {
error);
}
TEST_F(PeerConnectionJsepTest, RollbackSupportedInUnifiedPlan) {
RTCConfiguration config;
config.sdp_semantics = SdpSemantics::kUnifiedPlan;
config.enable_implicit_rollback = true;
auto caller = CreatePeerConnection(config);
auto callee = CreatePeerConnection(config);
EXPECT_TRUE(caller->CreateOfferAndSetAsLocal());
EXPECT_TRUE(caller->SetLocalDescription(caller->CreateRollback()));
EXPECT_TRUE(caller->CreateOfferAndSetAsLocal());
EXPECT_TRUE(caller->SetRemoteDescription(caller->CreateRollback()));
EXPECT_TRUE(caller->CreateOfferAndSetAsLocal());
EXPECT_TRUE(caller->SetRemoteDescription(callee->CreateOffer()));
}
TEST_F(PeerConnectionJsepTest, RollbackNotSupportedInPlanB) {
RTCConfiguration config;
config.sdp_semantics = SdpSemantics::kPlanB;
config.enable_implicit_rollback = true;
auto caller = CreatePeerConnection(config);
auto callee = CreatePeerConnection(config);
EXPECT_TRUE(caller->CreateOfferAndSetAsLocal());
EXPECT_FALSE(caller->SetLocalDescription(caller->CreateRollback()));
EXPECT_FALSE(caller->SetRemoteDescription(caller->CreateRollback()));
EXPECT_FALSE(caller->SetRemoteDescription(callee->CreateOffer()));
}
TEST_F(PeerConnectionJsepTest, RollbackFailsInStableState) {
auto caller = CreatePeerConnection();
EXPECT_FALSE(caller->SetLocalDescription(caller->CreateRollback()));
EXPECT_FALSE(caller->SetRemoteDescription(caller->CreateRollback()));
}
TEST_F(PeerConnectionJsepTest, RollbackToStableStateAndClearLocalOffer) {
auto caller = CreatePeerConnection();
EXPECT_TRUE(caller->CreateOfferAndSetAsLocal());
EXPECT_TRUE(caller->SetLocalDescription(caller->CreateRollback()));
EXPECT_EQ(caller->signaling_state(), PeerConnectionInterface::kStable);
EXPECT_EQ(caller->pc()->pending_local_description(), nullptr);
EXPECT_TRUE(caller->CreateOfferAndSetAsLocal());
EXPECT_TRUE(caller->SetRemoteDescription(caller->CreateRollback()));
EXPECT_EQ(caller->signaling_state(), PeerConnectionInterface::kStable);
EXPECT_EQ(caller->pc()->pending_local_description(), nullptr);
}
TEST_F(PeerConnectionJsepTest, RollbackToStableStateAndClearRemoteOffer) {
auto caller = CreatePeerConnection();
auto callee = CreatePeerConnection();
EXPECT_TRUE(callee->SetRemoteDescription(caller->CreateOffer()));
EXPECT_TRUE(callee->SetRemoteDescription(caller->CreateRollback()));
EXPECT_EQ(callee->signaling_state(), PeerConnectionInterface::kStable);
EXPECT_EQ(callee->pc()->pending_remote_description(), nullptr);
EXPECT_TRUE(callee->SetRemoteDescription(caller->CreateOffer()));
EXPECT_TRUE(callee->SetLocalDescription(caller->CreateRollback()));
EXPECT_EQ(callee->signaling_state(), PeerConnectionInterface::kStable);
EXPECT_EQ(callee->pc()->pending_remote_description(), nullptr);
}
TEST_F(PeerConnectionJsepTest, RollbackLocalOfferImplicitly) {
RTCConfiguration config;
config.sdp_semantics = SdpSemantics::kUnifiedPlan;
config.enable_implicit_rollback = true;
auto caller = CreatePeerConnection(config);
auto callee = CreatePeerConnection(config);
EXPECT_TRUE(callee->CreateOfferAndSetAsLocal());
EXPECT_TRUE(callee->SetRemoteDescription(caller->CreateOffer()));
EXPECT_EQ(callee->signaling_state(),
PeerConnectionInterface::kHaveRemoteOffer);
}
TEST_F(PeerConnectionJsepTest, AttemptToRollbackLocalOfferImplicitly) {
RTCConfiguration config;
config.sdp_semantics = SdpSemantics::kUnifiedPlan;
config.enable_implicit_rollback = true;
auto caller = CreatePeerConnection(config);
auto callee = CreatePeerConnection(config);
EXPECT_TRUE(callee->CreateOfferAndSetAsLocal());
EXPECT_FALSE(callee->SetRemoteDescription(
CreateSessionDescription(SdpType::kOffer, "invalid sdp")));
EXPECT_EQ(callee->signaling_state(),
PeerConnectionInterface::kHaveLocalOffer);
}
TEST_F(PeerConnectionJsepTest, RollbackRemovesTransceiver) {
auto caller = CreatePeerConnection();
caller->AddTransceiver(cricket::MEDIA_TYPE_AUDIO);
auto callee = CreatePeerConnection();
EXPECT_TRUE(callee->SetRemoteDescription(caller->CreateOffer()));
EXPECT_EQ(callee->pc()->GetTransceivers().size(), size_t{1});
EXPECT_TRUE(callee->SetRemoteDescription(caller->CreateRollback()));
EXPECT_EQ(callee->pc()->GetTransceivers().size(), size_t{0});
}
TEST_F(PeerConnectionJsepTest, RollbackKeepsTransceiverAndClearsMid) {
auto caller = CreatePeerConnection();
caller->AddTransceiver(cricket::MEDIA_TYPE_AUDIO);
auto callee = CreatePeerConnection();
EXPECT_TRUE(callee->SetRemoteDescription(caller->CreateOffer()));
callee->AddAudioTrack("a");
EXPECT_EQ(callee->pc()->GetTransceivers().size(), size_t{1});
EXPECT_TRUE(callee->SetRemoteDescription(caller->CreateRollback()));
// Transceiver can't be removed as track was added to it.
EXPECT_EQ(callee->pc()->GetTransceivers().size(), size_t{1});
// Mid got cleared to make it reusable.
EXPECT_EQ(callee->pc()->GetTransceivers()[0]->mid(), absl::nullopt);
// Transceiver should be counted as addTrack-created after rollback.
EXPECT_TRUE(callee->SetRemoteDescription(caller->CreateOffer()));
EXPECT_EQ(callee->pc()->GetTransceivers().size(), size_t{1});
}
TEST_F(PeerConnectionJsepTest, RollbackRestoresMid) {
auto caller = CreatePeerConnection();
caller->AddTransceiver(cricket::MEDIA_TYPE_AUDIO);
auto callee = CreatePeerConnection();
callee->AddAudioTrack("a");
auto offer = callee->CreateOffer();
EXPECT_TRUE(callee->SetRemoteDescription(caller->CreateOffer()));
EXPECT_EQ(callee->pc()->GetTransceivers().size(), size_t{1});
EXPECT_NE(callee->pc()->GetTransceivers()[0]->mid(), absl::nullopt);
EXPECT_TRUE(callee->SetRemoteDescription(caller->CreateRollback()));
EXPECT_EQ(callee->pc()->GetTransceivers()[0]->mid(), absl::nullopt);
EXPECT_TRUE(callee->SetLocalDescription(std::move(offer)));
}
TEST_F(PeerConnectionJsepTest, RollbackRestoresMidAndRemovesTransceiver) {
auto callee = CreatePeerConnection();
callee->AddVideoTrack("a");
auto offer = callee->CreateOffer();
auto caller = CreatePeerConnection();
caller->AddAudioTrack("b");
caller->AddVideoTrack("c");
auto mid = callee->pc()->GetTransceivers()[0]->mid();
EXPECT_TRUE(callee->SetRemoteDescription(caller->CreateOffer()));
EXPECT_EQ(callee->pc()->GetTransceivers().size(), size_t{2});
EXPECT_TRUE(callee->SetRemoteDescription(caller->CreateRollback()));
EXPECT_EQ(callee->pc()->GetTransceivers().size(), size_t{1});
EXPECT_EQ(callee->pc()->GetTransceivers()[0]->mid(), mid);
EXPECT_EQ(callee->pc()->GetTransceivers()[0]->media_type(),
cricket::MEDIA_TYPE_VIDEO);
EXPECT_TRUE(callee->SetLocalDescription(std::move(offer)));
}
TEST_F(PeerConnectionJsepTest, ImplicitlyRollbackTransceiversWithSameMids) {
RTCConfiguration config;
config.sdp_semantics = SdpSemantics::kUnifiedPlan;
config.enable_implicit_rollback = true;
auto caller = CreatePeerConnection(config);
caller->AddTransceiver(cricket::MEDIA_TYPE_VIDEO);
auto callee = CreatePeerConnection(config);
callee->AddTransceiver(cricket::MEDIA_TYPE_VIDEO);
EXPECT_TRUE(callee->CreateOfferAndSetAsLocal());
auto initial_mid = callee->pc()->GetTransceivers()[0]->mid();
EXPECT_TRUE(callee->SetRemoteDescription(caller->CreateOfferAndSetAsLocal()));
EXPECT_EQ(callee->pc()->GetTransceivers().size(), size_t{2});
EXPECT_EQ(callee->pc()->GetTransceivers()[0]->mid(), absl::nullopt);
EXPECT_EQ(callee->pc()->GetTransceivers()[1]->mid(),
caller->pc()->GetTransceivers()[0]->mid());
EXPECT_TRUE(callee->CreateAnswerAndSetAsLocal()); // Go to stable.
EXPECT_TRUE(callee->CreateOfferAndSetAsLocal());
EXPECT_NE(callee->pc()->GetTransceivers()[0]->mid(), initial_mid);
}
TEST_F(PeerConnectionJsepTest, RollbackToNegotiatedStableState) {
RTCConfiguration config;
config.sdp_semantics = SdpSemantics::kUnifiedPlan;
config.bundle_policy = PeerConnectionInterface::kBundlePolicyMaxBundle;
auto caller = CreatePeerConnection(config);
caller->AddTransceiver(cricket::MEDIA_TYPE_AUDIO);
auto callee = CreatePeerConnection(config);
EXPECT_TRUE(callee->SetRemoteDescription(caller->CreateOfferAndSetAsLocal()));
EXPECT_TRUE(callee->CreateAnswerAndSetAsLocal());
caller->AddVideoTrack("a");
callee->AddVideoTrack("b");
EXPECT_TRUE(callee->CreateOfferAndSetAsLocal());
EXPECT_EQ(callee->pc()->GetTransceivers().size(), size_t{2});
auto audio_transport =
callee->pc()->GetTransceivers()[0]->sender()->dtls_transport();
EXPECT_EQ(callee->pc()->GetTransceivers()[0]->sender()->dtls_transport(),
callee->pc()->GetTransceivers()[1]->sender()->dtls_transport());
EXPECT_NE(callee->pc()->GetTransceivers()[1]->sender()->dtls_transport(),
nullptr);
EXPECT_TRUE(callee->SetRemoteDescription(caller->CreateRollback()));
EXPECT_EQ(callee->pc()->GetTransceivers()[0]->sender()->dtls_transport(),
audio_transport); // Audio must remain working after rollback.
EXPECT_EQ(callee->pc()->GetTransceivers()[1]->sender()->dtls_transport(),
nullptr);
EXPECT_TRUE(callee->SetRemoteDescription(caller->CreateOfferAndSetAsLocal()));
EXPECT_EQ(callee->pc()->GetTransceivers()[0]->sender()->dtls_transport(),
audio_transport); // Audio transport is still the same.
}
TEST_F(PeerConnectionJsepTest, RollbackAfterMultipleSLD) {
auto callee = CreatePeerConnection();
callee->AddTransceiver(cricket::MEDIA_TYPE_AUDIO);
EXPECT_TRUE(callee->CreateOfferAndSetAsLocal());
callee->AddTransceiver(cricket::MEDIA_TYPE_VIDEO);
EXPECT_TRUE(callee->CreateOfferAndSetAsLocal());
EXPECT_TRUE(callee->SetRemoteDescription(callee->CreateRollback()));
EXPECT_EQ(callee->pc()->GetTransceivers().size(), size_t{2});
EXPECT_EQ(callee->pc()->GetTransceivers()[0]->mid(), absl::nullopt);
EXPECT_EQ(callee->pc()->GetTransceivers()[1]->mid(), absl::nullopt);
}
TEST_F(PeerConnectionJsepTest, NoRollbackNeeded) {
auto caller = CreatePeerConnection();
caller->AddTransceiver(cricket::MEDIA_TYPE_AUDIO);
auto callee = CreatePeerConnection();
callee->AddTransceiver(cricket::MEDIA_TYPE_AUDIO);
EXPECT_TRUE(caller->CreateOfferAndSetAsLocal());
EXPECT_TRUE(caller->CreateOfferAndSetAsLocal());
EXPECT_TRUE(callee->SetRemoteDescription(caller->CreateOffer()));
EXPECT_TRUE(callee->SetRemoteDescription(caller->CreateOffer()));
}
} // namespace webrtc

5
pc/peer_connection_wrapper.cc
View file

@ -125,11 +125,6 @@ PeerConnectionWrapper::CreateAnswerAndSetAsLocal(
return answer;
}
std::unique_ptr<SessionDescriptionInterface>
PeerConnectionWrapper::CreateRollback() {
return CreateSessionDescription(SdpType::kRollback, "");
}
std::unique_ptr<SessionDescriptionInterface> PeerConnectionWrapper::CreateSdp(
rtc::FunctionView<void(CreateSessionDescriptionObserver*)> fn,
std::string* error_out) {

1
pc/peer_connection_wrapper.h
View file

@ -87,7 +87,6 @@ class PeerConnectionWrapper {
const PeerConnectionInterface::RTCOfferAnswerOptions& options);
// Calls CreateAnswerAndSetAsLocal with default options.
std::unique_ptr<SessionDescriptionInterface> CreateAnswerAndSetAsLocal();
std::unique_ptr<SessionDescriptionInterface> CreateRollback();
// Calls the underlying PeerConnection's SetLocalDescription method with the
// given session description and waits for the success/failure response.

2
pc/sdp_utils.cc
View file

@ -29,10 +29,8 @@ std::unique_ptr<SessionDescriptionInterface> CloneSessionDescriptionAsType(
SdpType type) {
RTC_DCHECK(sdesc);
auto clone = std::make_unique<JsepSessionDescription>(type);
if (sdesc->description()) {
clone->Initialize(sdesc->description()->Clone(), sdesc->session_id(),
sdesc->session_version());
}
// As of writing, our version of GCC does not allow returning a unique_ptr of
// a subclass as a unique_ptr of a base class. To get around this, we need to
// std::move the return value.