| /* |
| * Copyright 2020 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. |
| */ |
| |
| #include "pc/connection_context.h" |
| |
| #include <type_traits> |
| #include <utility> |
| #include <vector> |
| |
| #include "api/transport/field_trial_based_config.h" |
| #include "media/base/media_engine.h" |
| #include "media/sctp/sctp_transport_factory.h" |
| #include "rtc_base/helpers.h" |
| #include "rtc_base/internal/default_socket_server.h" |
| #include "rtc_base/socket_server.h" |
| #include "rtc_base/time_utils.h" |
| |
| namespace webrtc { |
| |
| namespace { |
| |
| rtc::Thread* MaybeStartNetworkThread( |
| rtc::Thread* old_thread, |
| std::unique_ptr<rtc::SocketFactory>& socket_factory_holder, |
| std::unique_ptr<rtc::Thread>& thread_holder) { |
| if (old_thread) { |
| return old_thread; |
| } |
| std::unique_ptr<rtc::SocketServer> socket_server = |
| rtc::CreateDefaultSocketServer(); |
| thread_holder = std::make_unique<rtc::Thread>(socket_server.get()); |
| socket_factory_holder = std::move(socket_server); |
| |
| thread_holder->SetName("pc_network_thread", nullptr); |
| thread_holder->Start(); |
| return thread_holder.get(); |
| } |
| |
| rtc::Thread* MaybeWrapThread(rtc::Thread* signaling_thread, |
| bool& wraps_current_thread) { |
| wraps_current_thread = false; |
| if (signaling_thread) { |
| return signaling_thread; |
| } |
| auto this_thread = rtc::Thread::Current(); |
| if (!this_thread) { |
| // If this thread isn't already wrapped by an rtc::Thread, create a |
| // wrapper and own it in this class. |
| this_thread = rtc::ThreadManager::Instance()->WrapCurrentThread(); |
| wraps_current_thread = true; |
| } |
| return this_thread; |
| } |
| |
| std::unique_ptr<SctpTransportFactoryInterface> MaybeCreateSctpFactory( |
| std::unique_ptr<SctpTransportFactoryInterface> factory, |
| rtc::Thread* network_thread, |
| const FieldTrialsView& field_trials) { |
| if (factory) { |
| return factory; |
| } |
| #ifdef WEBRTC_HAVE_SCTP |
| return std::make_unique<cricket::SctpTransportFactory>(network_thread); |
| #else |
| return nullptr; |
| #endif |
| } |
| |
| } // namespace |
| |
| // Static |
| rtc::scoped_refptr<ConnectionContext> ConnectionContext::Create( |
| PeerConnectionFactoryDependencies* dependencies) { |
| return rtc::scoped_refptr<ConnectionContext>( |
| new ConnectionContext(dependencies)); |
| } |
| |
| ConnectionContext::ConnectionContext( |
| PeerConnectionFactoryDependencies* dependencies) |
| : network_thread_(MaybeStartNetworkThread(dependencies->network_thread, |
| owned_socket_factory_, |
| owned_network_thread_)), |
| worker_thread_(dependencies->worker_thread, |
| []() { |
| auto thread_holder = rtc::Thread::Create(); |
| thread_holder->SetName("pc_worker_thread", nullptr); |
| thread_holder->Start(); |
| return thread_holder; |
| }), |
| signaling_thread_(MaybeWrapThread(dependencies->signaling_thread, |
| wraps_current_thread_)), |
| trials_(dependencies->trials ? std::move(dependencies->trials) |
| : std::make_unique<FieldTrialBasedConfig>()), |
| media_engine_(std::move(dependencies->media_engine)), |
| network_monitor_factory_( |
| std::move(dependencies->network_monitor_factory)), |
| default_network_manager_(std::move(dependencies->network_manager)), |
| call_factory_(std::move(dependencies->call_factory)), |
| default_socket_factory_(std::move(dependencies->packet_socket_factory)), |
| sctp_factory_( |
| MaybeCreateSctpFactory(std::move(dependencies->sctp_factory), |
| network_thread(), |
| *trials_.get())) { |
| RTC_DCHECK_RUN_ON(signaling_thread_); |
| RTC_DCHECK(!(default_network_manager_ && network_monitor_factory_)) |
| << "You can't set both network_manager and network_monitor_factory."; |
| |
| signaling_thread_->AllowInvokesToThread(worker_thread()); |
| signaling_thread_->AllowInvokesToThread(network_thread_); |
| worker_thread_->AllowInvokesToThread(network_thread_); |
| if (!network_thread_->IsCurrent()) { |
| // network_thread_->IsCurrent() == true means signaling_thread_ is |
| // network_thread_. In this case, no further action is required as |
| // signaling_thread_ can already invoke network_thread_. |
| network_thread_->PostTask( |
| [thread = network_thread_, worker_thread = worker_thread_.get()] { |
| thread->DisallowBlockingCalls(); |
| thread->DisallowAllInvokes(); |
| if (worker_thread == thread) { |
| // In this case, worker_thread_ == network_thread_ |
| thread->AllowInvokesToThread(thread); |
| } |
| }); |
| } |
| |
| rtc::InitRandom(rtc::Time32()); |
| |
| rtc::SocketFactory* socket_factory = dependencies->socket_factory; |
| if (socket_factory == nullptr) { |
| if (owned_socket_factory_) { |
| socket_factory = owned_socket_factory_.get(); |
| } else { |
| // TODO(bugs.webrtc.org/13145): This case should be deleted. Either |
| // require that a PacketSocketFactory and NetworkManager always are |
| // injected (with no need to construct these default objects), or require |
| // that if a network_thread is injected, an approprite rtc::SocketServer |
| // should be injected too. |
| socket_factory = network_thread()->socketserver(); |
| } |
| } |
| if (!default_network_manager_) { |
| // If network_monitor_factory_ is non-null, it will be used to create a |
| // network monitor while on the network thread. |
| default_network_manager_ = std::make_unique<rtc::BasicNetworkManager>( |
| network_monitor_factory_.get(), socket_factory, &field_trials()); |
| } |
| if (!default_socket_factory_) { |
| default_socket_factory_ = |
| std::make_unique<rtc::BasicPacketSocketFactory>(socket_factory); |
| } |
| // Set warning levels on the threads, to give warnings when response |
| // may be slower than is expected of the thread. |
| // Since some of the threads may be the same, start with the least |
| // restrictive limits and end with the least permissive ones. |
| // This will give warnings for all cases. |
| signaling_thread_->SetDispatchWarningMs(100); |
| worker_thread_->SetDispatchWarningMs(30); |
| network_thread_->SetDispatchWarningMs(10); |
| |
| if (media_engine_) { |
| // TODO(tommi): Change VoiceEngine to do ctor time initialization so that |
| // this isn't necessary. |
| worker_thread_->Invoke<void>(RTC_FROM_HERE, [&] { media_engine_->Init(); }); |
| } |
| } |
| |
| ConnectionContext::~ConnectionContext() { |
| RTC_DCHECK_RUN_ON(signaling_thread_); |
| worker_thread_->Invoke<void>(RTC_FROM_HERE, [&] { |
| RTC_DCHECK_RUN_ON(worker_thread()); |
| // While `media_engine_` is const throughout the ConnectionContext's |
| // lifetime, it requires destruction to happen on the worker thread. Instead |
| // of marking the pointer as non-const, we live with this const_cast<> in |
| // the destructor. |
| const_cast<std::unique_ptr<cricket::MediaEngineInterface>&>(media_engine_) |
| .reset(); |
| }); |
| |
| // Make sure `worker_thread()` and `signaling_thread()` outlive |
| // `default_socket_factory_` and `default_network_manager_`. |
| default_socket_factory_ = nullptr; |
| default_network_manager_ = nullptr; |
| |
| if (wraps_current_thread_) |
| rtc::ThreadManager::Instance()->UnwrapCurrentThread(); |
| } |
| |
| } // namespace webrtc |
