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
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
|
// NetworkSingleton.cpp
// Implements the cNetworkSingleton class representing the storage for global data pertaining to network API
// such as a list of all connections, all listening sockets and the LibEvent dispatch thread.
#include "Globals.h"
#include "NetworkSingleton.h"
#include "Network.h"
#include <event2/thread.h>
#include <event2/bufferevent.h>
#include <event2/listener.h>
cNetworkSingleton::cNetworkSingleton() :
m_HasTerminated(true)
{
}
cNetworkSingleton::~cNetworkSingleton() noexcept(false)
{
// Check that Terminate has been called already:
ASSERT(m_HasTerminated);
}
cNetworkSingleton & cNetworkSingleton::Get(void)
{
static cNetworkSingleton Instance;
return Instance;
}
void cNetworkSingleton::Initialise(void)
{
// Start the lookup thread
m_LookupThread.Start();
// Windows: initialize networking:
#ifdef _WIN32
WSADATA wsaData;
memset(&wsaData, 0, sizeof(wsaData));
int res = WSAStartup(MAKEWORD(2, 2), &wsaData);
if (res != 0)
{
int err = WSAGetLastError();
LOGWARNING("WSAStartup failed: %d, WSAGLE = %d (%s)", res, err, evutil_socket_error_to_string(err));
exit(1);
}
#endif // _WIN32
// Initialize LibEvent logging:
event_set_log_callback(LogCallback);
// Initialize threading:
#if defined(EVTHREAD_USE_WINDOWS_THREADS_IMPLEMENTED)
evthread_use_windows_threads();
#elif defined(EVTHREAD_USE_PTHREADS_IMPLEMENTED)
evthread_use_pthreads();
#else
#error No threading implemented for EVTHREAD
#endif
// Create the main event_base:
event_config * config = event_config_new();
event_config_set_flag(config, EVENT_BASE_FLAG_STARTUP_IOCP);
m_EventBase = event_base_new_with_config(config);
if (m_EventBase == nullptr)
{
LOGERROR("Failed to initialize LibEvent. The server will now terminate.");
abort();
}
event_config_free(config);
// Create the event loop thread:
m_HasTerminated = false;
m_EventLoopThread = std::thread(RunEventLoop, this);
m_StartupEvent.Wait(); // Wait for the LibEvent loop to actually start running (otherwise calling Terminate too
// soon would hang, see #3228)
}
void cNetworkSingleton::Terminate(void)
{
ASSERT(!m_HasTerminated);
// Wait for the lookup thread to stop
m_LookupThread.Stop();
// Wait for the LibEvent event loop to terminate:
event_base_loopbreak(m_EventBase);
m_EventLoopThread.join();
// Close all open connections:
{
cCSLock Lock(m_CS);
// Must take copies because Close will modify lists
auto Conns = m_Connections;
for (auto & Conn : Conns)
{
Conn->Close();
}
auto Servers = m_Servers;
for (auto & Server : Servers)
{
Server->Close();
}
// Closed handles should have removed themself
ASSERT(m_Connections.empty());
ASSERT(m_Servers.empty());
}
// Free the underlying LibEvent objects:
event_base_free(m_EventBase);
libevent_global_shutdown();
// Set the HasTerminated flag:
// (Only set the flag after everything has been removed, to avoid the random failures in the Google-test, caused by
// links terminating after this flag was set)
m_HasTerminated = true;
}
void cNetworkSingleton::LogCallback(int a_Severity, const char * a_Msg)
{
switch (a_Severity)
{
case _EVENT_LOG_DEBUG: LOGD("LibEvent: %s", a_Msg); break;
case _EVENT_LOG_MSG: LOG("LibEvent: %s", a_Msg); break;
case _EVENT_LOG_WARN: LOGWARNING("LibEvent: %s", a_Msg); break;
case _EVENT_LOG_ERR: LOGERROR("LibEvent: %s", a_Msg); break;
default:
{
LOGWARNING("LibEvent: Unknown log severity (%d): %s", a_Severity, a_Msg);
break;
}
}
}
void cNetworkSingleton::RunEventLoop(cNetworkSingleton * a_Self)
{
auto timer = evtimer_new(a_Self->m_EventBase, SignalizeStartup, a_Self);
timeval timeout {}; // Zero timeout - execute immediately
evtimer_add(timer, &timeout);
event_base_loop(a_Self->m_EventBase, EVLOOP_NO_EXIT_ON_EMPTY);
event_free(timer);
}
void cNetworkSingleton::SignalizeStartup(evutil_socket_t a_Socket, short a_Events, void * a_Self)
{
auto self = static_cast<cNetworkSingleton *>(a_Self);
ASSERT(self != nullptr);
self->m_StartupEvent.Set();
}
void cNetworkSingleton::AddLink(const cTCPLinkPtr & a_Link)
{
ASSERT(!m_HasTerminated);
cCSLock Lock(m_CS);
m_Connections.push_back(a_Link);
}
void cNetworkSingleton::RemoveLink(const cTCPLink * a_Link)
{
ASSERT(!m_HasTerminated);
cCSLock Lock(m_CS);
for (auto itr = m_Connections.begin(), end = m_Connections.end(); itr != end; ++itr)
{
if (itr->get() == a_Link)
{
m_Connections.erase(itr);
return;
}
} // for itr - m_Connections[]
}
void cNetworkSingleton::AddServer(const cServerHandlePtr & a_Server)
{
ASSERT(!m_HasTerminated);
cCSLock Lock(m_CS);
m_Servers.push_back(a_Server);
}
void cNetworkSingleton::RemoveServer(const cServerHandle * a_Server)
{
ASSERT(!m_HasTerminated);
cCSLock Lock(m_CS);
for (auto itr = m_Servers.begin(), end = m_Servers.end(); itr != end; ++itr)
{
if (itr->get() == a_Server)
{
m_Servers.erase(itr);
return;
}
} // for itr - m_Servers[]
}
|
