path: root/Minecraft.World/Connection.cpp

#include "stdafx.h"
#include "InputOutputStream.h"
#include "Socket.h"
#include "Connection.h"
#include "ThreadName.h"
#include "compression.h"
#include "..\Minecraft.Client\PS3\PS3Extras\ShutdownManager.h"

// This should always be enabled, except for debugging use
#ifndef _DEBUG
#define CONNECTION_ENABLE_TIMEOUT_DISCONNECT 1
#endif

int Connection::readThreads = 0;
int Connection::writeThreads = 0;

int Connection::readSizes[256];
int Connection::writeSizes[256];



void Connection::_init()
{
//	printf("Con:0x%x init\n",this);
	InitializeCriticalSection(&writeLock);
	InitializeCriticalSection(&threadCounterLock);
	InitializeCriticalSection(&incoming_cs);

	running = true;
	quitting = false;
	disconnected = false;
	disconnectReason = DisconnectPacket::eDisconnect_None;
	noInputTicks = 0;
	estimatedRemaining = 0;
	fakeLag = 0;
	slowWriteDelay = 50;

	saqThreadID = 0;
	closeThreadID = 0;

	tickCount = 0;

}

// 4J Jev, need to delete the critical section.
Connection::~Connection()
{
	// 4J Stu - Just to be sure, make sure the read and write threads terminate themselves before the connection object is destroyed
	running = false;
	if( dis ) dis->close();		// The input stream needs closed before the readThread, or the readThread
								// may get stuck whilst blocking waiting on a read
	readThread->WaitForCompletion(INFINITE);
	writeThread->WaitForCompletion(INFINITE);

	DeleteCriticalSection(&writeLock);
	DeleteCriticalSection(&threadCounterLock);
	DeleteCriticalSection(&incoming_cs);

	delete m_hWakeReadThread;
	delete m_hWakeWriteThread;

	// These should all have been destroyed in close() but no harm in checking again
	delete byteArrayDos;
	byteArrayDos = NULL;
	delete baos;
	baos = NULL;
	if( bufferedDos )
	{
		bufferedDos->deleteChildStream();
		delete bufferedDos;
		bufferedDos = NULL;
	}
	delete dis;
	dis = NULL;
}

Connection::Connection(Socket *socket, const wstring& id, PacketListener *packetListener) // throws IOException
{
	_init();

	this->socket = socket;

	address = socket->getRemoteSocketAddress();

	this->packetListener = packetListener;

	//try {
	socket->setSoTimeout(30000);
	socket->setTrafficClass(IPTOS_THROUGHPUT | IPTOS_LOWDELAY);

	/* 4J JEV no catch
	} catch (SocketException e) {
	// catching this exception because it (apparently?) causes problems
	// on OSX Tiger
	System.err.println(e.getMessage());
	}*/

	dis = new DataInputStream(socket->getInputStream(packetListener->isServerPacketListener()));
		
	sos = socket->getOutputStream(packetListener->isServerPacketListener());
	bufferedDos = new DataOutputStream(new BufferedOutputStream(sos, SEND_BUFFER_SIZE));
	baos = new ByteArrayOutputStream( SEND_BUFFER_SIZE );
	byteArrayDos = new DataOutputStream(baos);

	m_hWakeReadThread = new C4JThread::Event;
	m_hWakeWriteThread = new C4JThread::Event;

	const char *szId = wstringtofilename(id);
	char readThreadName[256];
	char writeThreadName[256];
	sprintf(readThreadName,"%s read\n",szId);
	sprintf(writeThreadName,"%s write\n",szId);

	readThread = new C4JThread(runRead, (void*)this, readThreadName, READ_STACK_SIZE);
	writeThread = new C4JThread(runWrite, this, writeThreadName, WRITE_STACK_SIZE);
	readThread->SetProcessor(CPU_CORE_CONNECTIONS);
	writeThread->SetProcessor(CPU_CORE_CONNECTIONS );
#ifdef __ORBIS__
	readThread->SetPriority(THREAD_PRIORITY_BELOW_NORMAL);	// On Orbis, this core is also used for Matching 2, and that priority of that seems to be always at default no matter what we set it to. Prioritise this below Matching 2.
	writeThread->SetPriority(THREAD_PRIORITY_BELOW_NORMAL);	// On Orbis, this core is also used for Matching 2, and that priority of that seems to be always at default no matter what we set it to. Prioritise this below Matching 2.
#endif

	readThread->Run();
	writeThread->Run();


	/* 4J JEV, java:	
	new Thread(wstring(id).append(L" read thread")) {

	};

	writeThread = new Thread(id + " write thread") {
	public void run() {

	};

	readThread->start();
	writeThread->start();
	*/
}


void Connection::setListener(PacketListener *packetListener)
{
	this->packetListener = packetListener;
}

void Connection::send(shared_ptr<Packet> packet)
{
	if (quitting) 	return;

	MemSect(15);
	// 4J Jev, synchronized (&writeLock)
	EnterCriticalSection(&writeLock);

	estimatedRemaining += packet->getEstimatedSize() + 1;
	if (packet->shouldDelay) 
	{
		// 4J We have delayed it enough by putting it in the slow queue, so don't delay when we actually send it
		packet->shouldDelay = false;
		outgoing_slow.push(packet);
	}
	else
	{
		outgoing.push(packet);
	}

	// 4J Jev, end synchronized.
	LeaveCriticalSection(&writeLock);
	MemSect(0);
}


void Connection::queueSend(shared_ptr<Packet> packet)
{
	if (quitting) return;
	EnterCriticalSection(&writeLock);
	estimatedRemaining += packet->getEstimatedSize() + 1;
	outgoing_slow.push(packet);
	LeaveCriticalSection(&writeLock);
}

bool Connection::writeTick()
{
	bool didSomething = false;

	// 4J Stu - If the connection is closed and the output stream has been deleted
	if(bufferedDos==NULL || byteArrayDos==NULL)
		return didSomething;

	// try {
	if (!outgoing.empty() && (fakeLag == 0 || System::currentTimeMillis() - outgoing.front()->createTime >= fakeLag))
	{
		shared_ptr<Packet> packet;

		EnterCriticalSection(&writeLock);

		packet = outgoing.front();
		outgoing.pop();
		estimatedRemaining -= packet->getEstimatedSize() + 1;

		LeaveCriticalSection(&writeLock);

		Packet::writePacket(packet, bufferedDos);
		

#ifndef _CONTENT_PACKAGE
		// 4J Added for debugging
		int playerId = 0;
		if( !socket->isLocal() ) 
		{
			Socket *socket = getSocket();
			if( socket )
			{
				INetworkPlayer *player = socket->getPlayer();
				if( player )
				{
					playerId = player->GetSmallId();
				}
			}
			Packet::recordOutgoingPacket(packet,playerId);
		}
#endif

		// 4J Stu - Changed this so that rather than writing to the network stream through a buffered stream we want to:
		// a) Only push whole "game" packets to QNet, rather than amalgamated chunks of data that may include many packets, and partial packets
		// b) To be able to change the priority and queue of a packet if required
		//sos->writeWithFlags( baos->buf, 0, baos->size(), 0 );
		//baos->reset();

		writeSizes[packet->getId()] += packet->getEstimatedSize() + 1;
		didSomething = true;
	}

	if ((slowWriteDelay-- <= 0) && !outgoing_slow.empty() && (fakeLag == 0 || System::currentTimeMillis() - outgoing_slow.front()->createTime >= fakeLag))
	{
		shared_ptr<Packet> packet;

		//synchronized (writeLock) {

		EnterCriticalSection(&writeLock);

		packet = outgoing_slow.front();
		outgoing_slow.pop();
		estimatedRemaining -= packet->getEstimatedSize() + 1;

		LeaveCriticalSection(&writeLock);

		// If the shouldDelay flag is still set at this point then we want to write it to QNet as a single packet with priority flags
		// Otherwise just buffer the packet with other outgoing packets as the java game did
		if(packet->shouldDelay)
		{
			Packet::writePacket(packet, byteArrayDos);

			// 4J Stu - Changed this so that rather than writing to the network stream through a buffered stream we want to:
			// a) Only push whole "game" packets to QNet, rather than amalgamated chunks of data that may include many packets, and partial packets
			// b) To be able to change the priority and queue of a packet if required
#ifdef _XBOX
			int flags = QNET_SENDDATA_LOW_PRIORITY | QNET_SENDDATA_SECONDARY;
#else
			int flags = NON_QNET_SENDDATA_ACK_REQUIRED;
#endif
			sos->writeWithFlags( baos->buf, 0, baos->size(), flags  );
			baos->reset();
		}
		else
		{
			Packet::writePacket(packet, bufferedDos);
		}

#ifndef _CONTENT_PACKAGE
		// 4J Added for debugging
		if( !socket->isLocal() ) 
		{
			int playerId = 0;
			if( !socket->isLocal() ) 
			{
				Socket *socket = getSocket();
				if( socket )
				{
					INetworkPlayer *player = socket->getPlayer();
					if( player )
					{
						playerId = player->GetSmallId();
					}
				}
				Packet::recordOutgoingPacket(packet,playerId);
			}
		}
#endif	

		writeSizes[packet->getId()] += packet->getEstimatedSize() + 1;
		slowWriteDelay = 0;
		didSomething = true;
	}
	/* 4J JEV, removed try/catch
	} catch (Exception e) {
	if (!disconnected) handleException(e);
	return false;
	} */

	return didSomething;
}


void Connection::flush()
{
	// TODO 4J Stu - How to interrupt threads? Or do we need to change the multithreaded functions a bit more
	//readThread.interrupt();
	//writeThread.interrupt();
	m_hWakeReadThread->Set();
	m_hWakeWriteThread->Set();
}


bool Connection::readTick()
{
	bool didSomething = false;

	// 4J Stu - If the connection has closed and the input stream has been deleted
	if(dis==NULL)
		return didSomething;

	//try {

	shared_ptr<Packet> packet = Packet::readPacket(dis, packetListener->isServerPacketListener());

	if (packet != NULL)
	{
		readSizes[packet->getId()] += packet->getEstimatedSize() + 1;
		EnterCriticalSection(&incoming_cs);
		if(!quitting)
		{
			incoming.push(packet);
		}
		LeaveCriticalSection(&incoming_cs);
		didSomething = true;
	} 
	else
	{
//		printf("Con:0x%x readTick close EOS\n",this);

		// 4J Stu - Remove this line
		// Fix for #10410 - UI: If the player is removed from a splitscreened host�s game, the next game that player joins will produce a message stating that the host has left.
		//close(DisconnectPacket::eDisconnect_EndOfStream);
	}


	/* 4J JEV, removed try/catch
	} catch (Exception e) {
	if (!disconnected) handleException(e);
	return false;
	} */

	return didSomething;
}


/* 4J JEV, removed try/catch
void handleException(Exception e)
{
e.printStackTrace();
close("disconnect.genericReason", "Internal exception: " + e.toString());
}*/


void Connection::close(DisconnectPacket::eDisconnectReason reason, ...)
{
//	printf("Con:0x%x close\n",this);
	if (!running) return;
//	printf("Con:0x%x close doing something\n",this);
	disconnected = true;

	va_list input;
	va_start( input, reason );

	disconnectReason = reason;//va_arg( input, const wstring );

	vector<void *> objs = vector<void *>();
	void *i = NULL;
	while (i != NULL)
	{
		i = va_arg( input, void* );
		objs.push_back(i);
	}

	if( objs.size() )
	{
		disconnectReasonObjects = &objs[0];
	}
	else
	{
		disconnectReasonObjects = NULL;
	}

	//	int count = 0, sum = 0, i = first;
	//	va_list marker;
	//	
	//	va_start( marker, first );
	//	while( i != -1 )
	//	{
	//	   sum += i;
	//	   count++;
	//	   i = va_arg( marker, int);
	//	}
	//	va_end( marker );
	//	return( sum ? (sum / count) : 0 );


//	CreateThread(NULL, 0, runClose, this, 0, &closeThreadID);

	running = false;

	if( dis ) dis->close();		// The input stream needs closed before the readThread, or the readThread
						// may get stuck whilst blocking waiting on a read

	// Make sure that the read & write threads are dead before we go and kill the streams that they depend on
	readThread->WaitForCompletion(INFINITE);
	writeThread->WaitForCompletion(INFINITE);

	delete dis;
	dis = NULL;
	if( bufferedDos )
	{
		bufferedDos->close();
		bufferedDos->deleteChildStream();
		delete bufferedDos;
		bufferedDos = NULL;
	}
	if( byteArrayDos )
	{
		byteArrayDos->close();
		delete byteArrayDos;
		byteArrayDos = NULL;
	}
	if( socket )
	{
		socket->close(packetListener->isServerPacketListener());
		socket = NULL;
	}
}

void Connection::tick()
{
	if (estimatedRemaining > 1 * 1024 * 1024)
	{
		close(DisconnectPacket::eDisconnect_Overflow);
	}
	EnterCriticalSection(&incoming_cs);
	bool empty = incoming.empty();
	LeaveCriticalSection(&incoming_cs);
	if (empty)
	{
#if CONNECTION_ENABLE_TIMEOUT_DISCONNECT
		if (noInputTicks++ == MAX_TICKS_WITHOUT_INPUT)
		{
			close(DisconnectPacket::eDisconnect_TimeOut);
		}
#endif
	}
	// 4J Stu - Moved this a bit later in the function to stop the race condition of Disconnect packets not being processed when local client leaves
	//else if( socket && socket->isClosing() )
	//{
	//	close(DisconnectPacket::eDisconnect_Closed);
	//}
	else
	{
		noInputTicks = 0;

	}

	// 4J Added - Send a KeepAlivePacket every now and then to ensure that our read and write threads don't timeout
	tickCount++;
    if (tickCount % 20 == 0)
	{
        send( shared_ptr<KeepAlivePacket>( new KeepAlivePacket() ) );
    }

	// 4J Stu - 1.8.2 changed from 100 to 1000
	int max = 1000;

	// 4J-PB - NEEDS CHANGED!!!
	// If we can call connection.close from within a packet->handle, then we can lockup because the loop below has locked incoming_cs, and the connection.close will flag the read and write threads for the connection to close.
	// they are running on other threads, and will try to lock incoming_cs
	// We got this with a pre-login packet of a player who wasn't allowed to play due to parental controls, so was kicked out
	// This has been changed to use a eAppAction_ExitPlayerPreLogin which will run in the main loop, so the connection will not be ticked at that point


	EnterCriticalSection(&incoming_cs);
	// 4J Stu - If disconnected, then we shouldn't process incoming packets
	std::vector< shared_ptr<Packet> > packetsToHandle;
	while (!disconnected && !g_NetworkManager.IsLeavingGame() && g_NetworkManager.IsInSession() && !incoming.empty() && max-- >= 0)
	{
		shared_ptr<Packet> packet = incoming.front();
		packetsToHandle.push_back(packet);
		incoming.pop();
	}
	LeaveCriticalSection(&incoming_cs);

	// MGH - moved the packet handling outside of the incoming_cs block, as it was locking up sometimes when disconnecting
	for(int i=0; i<packetsToHandle.size();i++)
	{
		PIXBeginNamedEvent(0,"Handling packet %d\n",packetsToHandle[i]->getId());
		packetsToHandle[i]->handle(packetListener);
		PIXEndNamedEvent();
	}
	flush();

	// 4J Stu - Moved this a bit later in the function to stop the race condition of Disconnect packets not being processed when local client leaves
	if( socket && socket->isClosing() )
	{
		close(DisconnectPacket::eDisconnect_Closed);
	}

	// 4J - split the following condition (used to be disconnect && iscoming.empty()) so we can wrap the access in a critical section
	if (disconnected)
	{
		EnterCriticalSection(&incoming_cs);
		bool empty = incoming.empty();
		LeaveCriticalSection(&incoming_cs);
		if( empty )
		{
			packetListener->onDisconnect(disconnectReason, disconnectReasonObjects);
			disconnected = false; // 4J added - don't keep sending this every tick
		}
	}
}

SocketAddress *Connection::getRemoteAddress()
{
	return (SocketAddress *) address;
}

void Connection::sendAndQuit()
{
	if (quitting)
	{
		return;
	}
//	printf("Con:0x%x send & quit\n",this);
	flush();
	quitting = true;
	// TODO 4J Stu - How to interrupt threads? Or do we need to change the multithreaded functions a bit more
	//readThread.interrupt();

#if 1
	// 4J - this used to be in a thread but not sure why, and is causing trouble for us if we kill the connection
	// whilst the thread is still expecting to be able to send a packet a couple of seconds after starting it
	if (running)
	{
		// 4J TODO writeThread.interrupt();
		close(DisconnectPacket::eDisconnect_Closed);
	}
#else
	CreateThread(NULL, 0, runSendAndQuit, this, 0, &saqThreadID);
#endif
}

int Connection::countDelayedPackets()
{
	return (int)outgoing_slow.size();
}


int Connection::runRead(void* lpParam)
{
	ShutdownManager::HasStarted(ShutdownManager::eConnectionReadThreads);
	Connection *con = (Connection *)lpParam;

	if (con == NULL)
	{
#ifdef __PS3__
		ShutdownManager::HasFinished(ShutdownManager::eConnectionReadThreads);
#endif
		return 0;
	}

	Compression::UseDefaultThreadStorage();

	CRITICAL_SECTION *cs = &con->threadCounterLock;

	EnterCriticalSection(cs);
	con->readThreads++;
	LeaveCriticalSection(cs);

	//try {

	MemSect(19);
	while (con->running && !con->quitting && ShutdownManager::ShouldRun(ShutdownManager::eConnectionReadThreads))
	{
		while (con->readTick())
			;

		// try {
		//Sleep(100L);
		// TODO - 4J Stu - 1.8.2 changes these sleeps to 2L, but not sure whether we should do that as well
		con->m_hWakeReadThread->WaitForSignal(100L);
	}
	MemSect(0);

	/* 4J JEV, removed try/catch
	} catch (InterruptedException e) {
	}
	}
	} finally {
	synchronized (threadCounterLock) {
	readThreads--;
	}
	} */

	ShutdownManager::HasFinished(ShutdownManager::eConnectionReadThreads);
	return 0;
}

int Connection::runWrite(void* lpParam)
{
	ShutdownManager::HasStarted(ShutdownManager::eConnectionWriteThreads);
	Connection *con = dynamic_cast<Connection *>((Connection *) lpParam);

	if (con == NULL)
	{
		ShutdownManager::HasFinished(ShutdownManager::eConnectionWriteThreads);
		return 0;
	}

	Compression::UseDefaultThreadStorage();

	CRITICAL_SECTION *cs = &con->threadCounterLock;

	EnterCriticalSection(cs);
	con->writeThreads++;
	LeaveCriticalSection(cs);

	// 4J Stu - Adding this to force us to run through the writeTick at least once after the event is fired
	// Otherwise there is a race between the calling thread setting the running flag and this loop checking the condition
	DWORD waitResult = WAIT_TIMEOUT;

	while ((con->running || waitResult == WAIT_OBJECT_0 ) && ShutdownManager::ShouldRun(ShutdownManager::eConnectionWriteThreads))
	{
		while (con->writeTick())
			;

		//Sleep(100L);	
		// TODO - 4J Stu - 1.8.2 changes these sleeps to 2L, but not sure whether we should do that as well	
		waitResult = con->m_hWakeWriteThread->WaitForSignal(100L);

		if (con->bufferedDos != NULL) con->bufferedDos->flush();
		//if (con->byteArrayDos != NULL) con->byteArrayDos->flush();
	}


	// 4J was in a finally block.
	EnterCriticalSection(cs);
	con->writeThreads--;
	LeaveCriticalSection(cs);

	ShutdownManager::HasFinished(ShutdownManager::eConnectionWriteThreads);
	return 0;
}

int Connection::runClose(void* lpParam)
{
	Connection *con = dynamic_cast<Connection *>((Connection *) lpParam);

	if (con == NULL) return 0;

	//try {

	Sleep(2000);
	if (con->running)
	{
		// 4J TODO writeThread.interrupt();
		con->close(DisconnectPacket::eDisconnect_Closed);
	}

	/* 4J Jev, removed try/catch
	} catch (Exception e) {
	e.printStackTrace();
	} */

	return 1;
}

int Connection::runSendAndQuit(void* lpParam)
{
	Connection *con = dynamic_cast<Connection *>((Connection *) lpParam);
//	printf("Con:0x%x runSendAndQuit\n",con);

	if (con == NULL) return 0;

	//try {

	Sleep(2000);
	if (con->running)
	{
		// 4J TODO writeThread.interrupt();
		con->close(DisconnectPacket::eDisconnect_Closed);
//		printf("Con:0x%x runSendAndQuit close\n",con);
	}

//	printf("Con:0x%x runSendAndQuit end\n",con);
	/* 4J Jev, removed try/catch
	} catch (Exception e) {
	e.printStackTrace();
	} */

	return 0;
}