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// 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 "OSSupport/Network.h"
#include <event2/thread.h>
#include <event2/bufferevent.h>
#include <event2/listener.h>
cNetworkSingleton::cNetworkSingleton() :
m_HasTerminated(true)
{
}
cNetworkSingleton::~cNetworkSingleton() CAN_THROW
{
// 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:
m_EventBase = event_base_new();
if (m_EventBase == nullptr)
{
LOGERROR("Failed to initialize LibEvent. The server will now terminate.");
abort();
}
// 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(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(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[]
}
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