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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 <event2/event.h>
#include <event2/thread.h>
#include <event2/bufferevent.h>
#include <event2/dns.h>
#include <event2/listener.h>
#include "IPLookup.h"
#include "HostnameLookup.h"
cNetworkSingleton::cNetworkSingleton() :
m_HasTerminated(true)
{
}
cNetworkSingleton::~cNetworkSingleton()
{
// Check that Terminate has been called already:
ASSERT(m_HasTerminated);
}
cNetworkSingleton & cNetworkSingleton::Get(void)
{
static cNetworkSingleton Instance;
return Instance;
}
void cNetworkSingleton::Initialise(void)
{
// 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 DNS lookup helper:
m_DNSBase = evdns_base_new(m_EventBase, 1);
if (m_DNSBase == nullptr)
{
LOGERROR("Failed to initialize LibEvent's DNS subsystem. The server will now terminate.");
abort();
}
// Create the event loop thread:
m_EventLoopThread = std::thread(RunEventLoop, this);
m_HasTerminated = false;
}
void cNetworkSingleton::Terminate(void)
{
ASSERT(!m_HasTerminated);
// Wait for the LibEvent event loop to terminate:
event_base_loopbreak(m_EventBase);
m_EventLoopThread.join();
// Remove all objects:
{
cCSLock Lock(m_CS);
m_Connections.clear();
m_Servers.clear();
m_HostnameLookups.clear();
m_IPLookups.clear();
}
// Free the underlying LibEvent objects:
evdns_base_free(m_DNSBase, true);
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)
{
event_base_loop(a_Self->m_EventBase, EVLOOP_NO_EXIT_ON_EMPTY);
}
void cNetworkSingleton::AddHostnameLookup(cHostnameLookupPtr a_HostnameLookup)
{
ASSERT(!m_HasTerminated);
cCSLock Lock(m_CS);
m_HostnameLookups.push_back(a_HostnameLookup);
}
void cNetworkSingleton::RemoveHostnameLookup(const cHostnameLookup * a_HostnameLookup)
{
ASSERT(!m_HasTerminated);
cCSLock Lock(m_CS);
for (auto itr = m_HostnameLookups.begin(), end = m_HostnameLookups.end(); itr != end; ++itr)
{
if (itr->get() == a_HostnameLookup)
{
m_HostnameLookups.erase(itr);
return;
}
} // for itr - m_HostnameLookups[]
}
void cNetworkSingleton::AddIPLookup(cIPLookupPtr a_IPLookup)
{
ASSERT(!m_HasTerminated);
cCSLock Lock(m_CS);
m_IPLookups.push_back(a_IPLookup);
}
void cNetworkSingleton::RemoveIPLookup(const cIPLookup * a_IPLookup)
{
ASSERT(!m_HasTerminated);
cCSLock Lock(m_CS);
for (auto itr = m_IPLookups.begin(), end = m_IPLookups.end(); itr != end; ++itr)
{
if (itr->get() == a_IPLookup)
{
m_IPLookups.erase(itr);
return;
}
} // for itr - m_IPLookups[]
}
void cNetworkSingleton::AddLink(cTCPLinkImplPtr a_Link)
{
ASSERT(!m_HasTerminated);
cCSLock Lock(m_CS);
m_Connections.push_back(a_Link);
}
void cNetworkSingleton::RemoveLink(const cTCPLinkImpl * 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(cServerHandleImplPtr a_Server)
{
ASSERT(!m_HasTerminated);
cCSLock Lock(m_CS);
m_Servers.push_back(a_Server);
}
void cNetworkSingleton::RemoveServer(const cServerHandleImpl * 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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