1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
|
/*
* 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 <memory>
#include <utility>
#include "api/environment/environment.h"
#include "api/scoped_refptr.h"
#include "api/sequence_checker.h"
#include "api/transport/sctp_transport_factory_interface.h"
#include "media/base/media_engine.h"
#include "media/sctp/sctp_transport_factory.h"
#include "p2p/base/basic_packet_socket_factory.h"
#include "pc/media_factory.h"
#include "rtc_base/checks.h"
#include "rtc_base/crypto_random.h"
#include "rtc_base/internal/default_socket_server.h"
#include "rtc_base/network.h"
#include "rtc_base/socket_factory.h"
#include "rtc_base/socket_server.h"
#include "rtc_base/thread.h"
#include "rtc_base/time_utils.h"
namespace webrtc {
namespace {
Thread* MaybeStartNetworkThread(
Thread* old_thread,
std::unique_ptr<SocketFactory>& socket_factory_holder,
std::unique_ptr<Thread>& thread_holder) {
if (old_thread) {
return old_thread;
}
std::unique_ptr<SocketServer> socket_server = CreateDefaultSocketServer();
thread_holder = std::make_unique<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();
}
Thread* MaybeWrapThread(Thread* signaling_thread, bool& wraps_current_thread) {
wraps_current_thread = false;
if (signaling_thread) {
return signaling_thread;
}
auto this_thread = Thread::Current();
if (!this_thread) {
// If this thread isn't already wrapped by an webrtc::Thread, create a
// wrapper and own it in this class.
this_thread = ThreadManager::Instance()->WrapCurrentThread();
wraps_current_thread = true;
}
return this_thread;
}
std::unique_ptr<SctpTransportFactoryInterface> MaybeCreateSctpFactory(
std::unique_ptr<SctpTransportFactoryInterface> factory,
Thread* network_thread) {
if (factory) {
return factory;
}
#ifdef WEBRTC_HAVE_SCTP
return std::make_unique<SctpTransportFactory>(network_thread);
#else
return nullptr;
#endif
}
} // namespace
// Static
scoped_refptr<ConnectionContext> ConnectionContext::Create(
const Environment& env,
PeerConnectionFactoryDependencies* dependencies) {
return scoped_refptr<ConnectionContext>(
new ConnectionContext(env, dependencies));
}
ConnectionContext::ConnectionContext(
const Environment& env,
PeerConnectionFactoryDependencies* dependencies)
: network_thread_(MaybeStartNetworkThread(dependencies->network_thread,
owned_socket_factory_,
owned_network_thread_)),
worker_thread_(dependencies->worker_thread,
[]() {
auto thread_holder = Thread::Create();
thread_holder->SetName("pc_worker_thread", nullptr);
thread_holder->Start();
return thread_holder;
}),
signaling_thread_(MaybeWrapThread(dependencies->signaling_thread,
wraps_current_thread_)),
env_(env),
media_engine_(
dependencies->media_factory != nullptr
? dependencies->media_factory->CreateMediaEngine(env_,
*dependencies)
: nullptr),
network_monitor_factory_(
std::move(dependencies->network_monitor_factory)),
default_network_manager_(std::move(dependencies->network_manager)),
call_factory_(std::move(dependencies->media_factory)),
default_socket_factory_(std::move(dependencies->packet_socket_factory)),
sctp_factory_(
MaybeCreateSctpFactory(std::move(dependencies->sctp_factory),
network_thread())),
use_rtx_(true) {
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);
}
});
}
InitRandom(Time32());
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
// webrtc::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<BasicNetworkManager>(
env, socket_factory, network_monitor_factory_.get());
}
if (!default_socket_factory_) {
default_socket_factory_ =
std::make_unique<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_->BlockingCall([&] { media_engine_->Init(); });
}
}
ConnectionContext::~ConnectionContext() {
RTC_DCHECK_RUN_ON(signaling_thread_);
// `media_engine_` requires destruction to happen on the worker thread.
worker_thread_->PostTask([media_engine = std::move(media_engine_)] {});
// 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_)
ThreadManager::Instance()->UnwrapCurrentThread();
}
} // namespace webrtc
|
