Add propper client initialization

-add client states to avoid server sending data to uninitialized clients
  -don't show uninitialized clients to other players
  -propper client disconnect handling
Minor comment fixes in server
Minor bugfixes in connection
  -improved peer id calculation
  -honor NDEBUG flag
  -improved disconnect handling
  -increased initial send window
Remove some dead code

src/CMakeLists.txt

@@ -308,6 +308,7 @@ set(common_SRCS
 	connection.cpp
 	environment.cpp
 	server.cpp
+	clientiface.cpp
 	socket.cpp
 	mapblock.cpp
 	mapsector.cpp

src/client.cpp

@@ -383,13 +383,6 @@ void Client::step(float dtime)
 		// 0ms
 		ReceiveAll();
 	}
-	
-	{
-		//TimeTaker timer("m_con_mutex + m_con.RunTimeouts()", m_device);
-		// 0ms
-		//JMutexAutoLock lock(m_con_mutex); //bulk comment-out
-		m_con.RunTimeouts(dtime);
-	}
 
 	/*
 		Packet counter
@@ -758,6 +751,7 @@ void Client::step(float dtime)
 	if (m_media_downloader && m_media_downloader->isStarted()) {
 		m_media_downloader->step(this);
 		if (m_media_downloader->isDone()) {
+			received_media();
 			delete m_media_downloader;
 			m_media_downloader = NULL;
 		}
@@ -1610,11 +1604,6 @@ void Client::ProcessData(u8 *data, u32 datasize, u16 sender_peer_id)
 		}
 
 		m_media_downloader->step(this);
-		if (m_media_downloader->isDone()) {
-			// might be done already if all media is in the cache
-			delete m_media_downloader;
-			m_media_downloader = NULL;
-		}
 	}
 	else if(command == TOCLIENT_MEDIA)
 	{
@@ -1666,11 +1655,6 @@ void Client::ProcessData(u8 *data, u32 datasize, u16 sender_peer_id)
 			m_media_downloader->conventionalTransferDone(
 					name, data, this);
 		}
-
-		if (m_media_downloader->isDone()) {
-			delete m_media_downloader;
-			m_media_downloader = NULL;
-		}
 	}
 	else if(command == TOCLIENT_TOOLDEF)
 	{

src/clientiface.cpp

@@ -0,0 +1,769 @@
+/*
+Minetest
+Copyright (C) 2010-2014 celeron55, Perttu Ahola <celeron55@gmail.com>
+
+This program is free software; you can redistribute it and/or modify
+it under the terms of the GNU Lesser General Public License as published by
+the Free Software Foundation; either version 2.1 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU Lesser General Public License for more details.
+
+You should have received a copy of the GNU Lesser General Public License along
+with this program; if not, write to the Free Software Foundation, Inc.,
+51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+*/
+
+#include "clientiface.h"
+#include "player.h"
+#include "settings.h"
+#include "mapblock.h"
+#include "connection.h"
+#include "environment.h"
+#include "map.h"
+#include "emerge.h"
+#include "serverobject.h"              // TODO this is used for cleanup of only
+
+#include "util/numeric.h"
+
+#include "main.h"                      // for g_settings
+
+void RemoteClient::GetNextBlocks(
+		ServerEnvironment *env,
+		EmergeManager * emerge,
+		float dtime,
+		std::vector<PrioritySortedBlockTransfer> &dest)
+{
+	DSTACK(__FUNCTION_NAME);
+
+
+	// Increment timers
+	m_nothing_to_send_pause_timer -= dtime;
+	m_nearest_unsent_reset_timer += dtime;
+
+	if(m_nothing_to_send_pause_timer >= 0)
+		return;
+
+	Player *player = env->getPlayer(peer_id);
+	// This can happen sometimes; clients and players are not in perfect sync.
+	if(player == NULL)
+		return;
+
+	// Won't send anything if already sending
+	if(m_blocks_sending.size() >= g_settings->getU16
+			("max_simultaneous_block_sends_per_client"))
+	{
+		//infostream<<"Not sending any blocks, Queue full."<<std::endl;
+		return;
+	}
+
+	v3f playerpos = player->getPosition();
+	v3f playerspeed = player->getSpeed();
+	v3f playerspeeddir(0,0,0);
+	if(playerspeed.getLength() > 1.0*BS)
+		playerspeeddir = playerspeed / playerspeed.getLength();
+	// Predict to next block
+	v3f playerpos_predicted = playerpos + playerspeeddir*MAP_BLOCKSIZE*BS;
+
+	v3s16 center_nodepos = floatToInt(playerpos_predicted, BS);
+
+	v3s16 center = getNodeBlockPos(center_nodepos);
+
+	// Camera position and direction
+	v3f camera_pos = player->getEyePosition();
+	v3f camera_dir = v3f(0,0,1);
+	camera_dir.rotateYZBy(player->getPitch());
+	camera_dir.rotateXZBy(player->getYaw());
+
+	/*infostream<<"camera_dir=("<<camera_dir.X<<","<<camera_dir.Y<<","
+			<<camera_dir.Z<<")"<<std::endl;*/
+
+	/*
+		Get the starting value of the block finder radius.
+	*/
+
+	if(m_last_center != center)
+	{
+		m_nearest_unsent_d = 0;
+		m_last_center = center;
+	}
+
+	/*infostream<<"m_nearest_unsent_reset_timer="
+			<<m_nearest_unsent_reset_timer<<std::endl;*/
+
+	// Reset periodically to workaround for some bugs or stuff
+	if(m_nearest_unsent_reset_timer > 20.0)
+	{
+		m_nearest_unsent_reset_timer = 0;
+		m_nearest_unsent_d = 0;
+		//infostream<<"Resetting m_nearest_unsent_d for "
+		//		<<server->getPlayerName(peer_id)<<std::endl;
+	}
+
+	//s16 last_nearest_unsent_d = m_nearest_unsent_d;
+	s16 d_start = m_nearest_unsent_d;
+
+	//infostream<<"d_start="<<d_start<<std::endl;
+
+	u16 max_simul_sends_setting = g_settings->getU16
+			("max_simultaneous_block_sends_per_client");
+	u16 max_simul_sends_usually = max_simul_sends_setting;
+
+	/*
+		Check the time from last addNode/removeNode.
+
+		Decrease send rate if player is building stuff.
+	*/
+	m_time_from_building += dtime;
+	if(m_time_from_building < g_settings->getFloat(
+				"full_block_send_enable_min_time_from_building"))
+	{
+		max_simul_sends_usually
+			= LIMITED_MAX_SIMULTANEOUS_BLOCK_SENDS;
+	}
+
+	/*
+		Number of blocks sending + number of blocks selected for sending
+	*/
+	u32 num_blocks_selected = m_blocks_sending.size();
+
+	/*
+		next time d will be continued from the d from which the nearest
+		unsent block was found this time.
+
+		This is because not necessarily any of the blocks found this
+		time are actually sent.
+	*/
+	s32 new_nearest_unsent_d = -1;
+
+	s16 d_max = g_settings->getS16("max_block_send_distance");
+	s16 d_max_gen = g_settings->getS16("max_block_generate_distance");
+
+	// Don't loop very much at a time
+	s16 max_d_increment_at_time = 2;
+	if(d_max > d_start + max_d_increment_at_time)
+		d_max = d_start + max_d_increment_at_time;
+
+	s32 nearest_emerged_d = -1;
+	s32 nearest_emergefull_d = -1;
+	s32 nearest_sent_d = -1;
+	bool queue_is_full = false;
+
+	s16 d;
+	for(d = d_start; d <= d_max; d++)
+	{
+		/*
+			Get the border/face dot coordinates of a "d-radiused"
+			box
+		*/
+		std::list<v3s16> list;
+		getFacePositions(list, d);
+
+		std::list<v3s16>::iterator li;
+		for(li=list.begin(); li!=list.end(); ++li)
+		{
+			v3s16 p = *li + center;
+
+			/*
+				Send throttling
+				- Don't allow too many simultaneous transfers
+				- EXCEPT when the blocks are very close
+
+				Also, don't send blocks that are already flying.
+			*/
+
+			// Start with the usual maximum
+			u16 max_simul_dynamic = max_simul_sends_usually;
+
+			// If block is very close, allow full maximum
+			if(d <= BLOCK_SEND_DISABLE_LIMITS_MAX_D)
+				max_simul_dynamic = max_simul_sends_setting;
+
+			// Don't select too many blocks for sending
+			if(num_blocks_selected >= max_simul_dynamic)
+			{
+				queue_is_full = true;
+				goto queue_full_break;
+			}
+
+			// Don't send blocks that are currently being transferred
+			if(m_blocks_sending.find(p) != m_blocks_sending.end())
+				continue;
+
+			/*
+				Do not go over-limit
+			*/
+			if(p.X < -MAP_GENERATION_LIMIT / MAP_BLOCKSIZE
+			|| p.X > MAP_GENERATION_LIMIT / MAP_BLOCKSIZE
+			|| p.Y < -MAP_GENERATION_LIMIT / MAP_BLOCKSIZE
+			|| p.Y > MAP_GENERATION_LIMIT / MAP_BLOCKSIZE
+			|| p.Z < -MAP_GENERATION_LIMIT / MAP_BLOCKSIZE
+			|| p.Z > MAP_GENERATION_LIMIT / MAP_BLOCKSIZE)
+				continue;
+
+			// If this is true, inexistent block will be made from scratch
+			bool generate = d <= d_max_gen;
+
+			{
+				/*// Limit the generating area vertically to 2/3
+				if(abs(p.Y - center.Y) > d_max_gen - d_max_gen / 3)
+					generate = false;*/
+
+				// Limit the send area vertically to 1/2
+				if(abs(p.Y - center.Y) > d_max / 2)
+					continue;
+			}
+
+			/*
+				Don't generate or send if not in sight
+				FIXME This only works if the client uses a small enough
+				FOV setting. The default of 72 degrees is fine.
+			*/
+
+			float camera_fov = (72.0*M_PI/180) * 4./3.;
+			if(isBlockInSight(p, camera_pos, camera_dir, camera_fov, 10000*BS) == false)
+			{
+				continue;
+			}
+
+			/*
+				Don't send already sent blocks
+			*/
+			{
+				if(m_blocks_sent.find(p) != m_blocks_sent.end())
+				{
+					continue;
+				}
+			}
+
+			/*
+				Check if map has this block
+			*/
+			MapBlock *block = env->getMap().getBlockNoCreateNoEx(p);
+
+			bool surely_not_found_on_disk = false;
+			bool block_is_invalid = false;
+			if(block != NULL)
+			{
+				// Reset usage timer, this block will be of use in the future.
+				block->resetUsageTimer();
+
+				// Block is dummy if data doesn't exist.
+				// It means it has been not found from disk and not generated
+				if(block->isDummy())
+				{
+					surely_not_found_on_disk = true;
+				}
+
+				// Block is valid if lighting is up-to-date and data exists
+				if(block->isValid() == false)
+				{
+					block_is_invalid = true;
+				}
+
+				if(block->isGenerated() == false)
+					block_is_invalid = true;
+
+				/*
+					If block is not close, don't send it unless it is near
+					ground level.
+
+					Block is near ground level if night-time mesh
+					differs from day-time mesh.
+				*/
+				if(d >= 4)
+				{
+					if(block->getDayNightDiff() == false)
+						continue;
+				}
+			}
+
+			/*
+				If block has been marked to not exist on disk (dummy)
+				and generating new ones is not wanted, skip block.
+			*/
+			if(generate == false && surely_not_found_on_disk == true)
+			{
+				// get next one.
+				continue;
+			}
+
+			/*
+				Add inexistent block to emerge queue.
+			*/
+			if(block == NULL || surely_not_found_on_disk || block_is_invalid)
+			{
+				if (emerge->enqueueBlockEmerge(peer_id, p, generate)) {
+					if (nearest_emerged_d == -1)
+						nearest_emerged_d = d;
+				} else {
+					if (nearest_emergefull_d == -1)
+						nearest_emergefull_d = d;
+					goto queue_full_break;
+				}
+
+				// get next one.
+				continue;
+			}
+
+			if(nearest_sent_d == -1)
+				nearest_sent_d = d;
+
+			/*
+				Add block to send queue
+			*/
+			PrioritySortedBlockTransfer q((float)d, p, peer_id);
+
+			dest.push_back(q);
+
+			num_blocks_selected += 1;
+		}
+	}
+queue_full_break:
+
+	// If nothing was found for sending and nothing was queued for
+	// emerging, continue next time browsing from here
+	if(nearest_emerged_d != -1){
+		new_nearest_unsent_d = nearest_emerged_d;
+	} else if(nearest_emergefull_d != -1){
+		new_nearest_unsent_d = nearest_emergefull_d;
+	} else {
+		if(d > g_settings->getS16("max_block_send_distance")){
+			new_nearest_unsent_d = 0;
+			m_nothing_to_send_pause_timer = 2.0;
+		} else {
+			if(nearest_sent_d != -1)
+				new_nearest_unsent_d = nearest_sent_d;
+			else
+				new_nearest_unsent_d = d;
+		}
+	}
+
+	if(new_nearest_unsent_d != -1)
+		m_nearest_unsent_d = new_nearest_unsent_d;
+}
+
+void RemoteClient::GotBlock(v3s16 p)
+{
+	if(m_blocks_sending.find(p) != m_blocks_sending.end())
+		m_blocks_sending.erase(p);
+	else
+	{
+		m_excess_gotblocks++;
+	}
+	m_blocks_sent.insert(p);
+}
+
+void RemoteClient::SentBlock(v3s16 p)
+{
+	if(m_blocks_sending.find(p) == m_blocks_sending.end())
+		m_blocks_sending[p] = 0.0;
+	else
+		infostream<<"RemoteClient::SentBlock(): Sent block"
+				" already in m_blocks_sending"<<std::endl;
+}
+
+void RemoteClient::SetBlockNotSent(v3s16 p)
+{
+	m_nearest_unsent_d = 0;
+
+	if(m_blocks_sending.find(p) != m_blocks_sending.end())
+		m_blocks_sending.erase(p);
+	if(m_blocks_sent.find(p) != m_blocks_sent.end())
+		m_blocks_sent.erase(p);
+}
+
+void RemoteClient::SetBlocksNotSent(std::map<v3s16, MapBlock*> &blocks)
+{
+	m_nearest_unsent_d = 0;
+
+	for(std::map<v3s16, MapBlock*>::iterator
+			i = blocks.begin();
+			i != blocks.end(); ++i)
+	{
+		v3s16 p = i->first;
+
+		if(m_blocks_sending.find(p) != m_blocks_sending.end())
+			m_blocks_sending.erase(p);
+		if(m_blocks_sent.find(p) != m_blocks_sent.end())
+			m_blocks_sent.erase(p);
+	}
+}
+
+void RemoteClient::notifyEvent(ClientStateEvent event)
+{
+	switch (m_state)
+	{
+	case Invalid:
+		assert("State update for client in invalid state" != 0);
+		break;
+
+	case Created:
+		switch(event)
+		{
+		case Init:
+			m_state = InitSent;
+			break;
+
+		case Disconnect:
+			m_state = Disconnecting;
+			break;
+
+		case SetDenied:
+			m_state = Denied;
+			break;
+
+		/* GotInit2 SetDefinitionsSent SetMediaSent */
+		default:
+			assert("Invalid client state transition!" == 0);
+		}
+		break;
+
+	case Denied:
+		/* don't do anything if in denied state */
+		break;
+
+	case InitSent:
+		switch(event)
+		{
+		case GotInit2:
+			confirmSerializationVersion();
+			m_state = InitDone;
+			break;
+
+		case Disconnect:
+			m_state = Disconnecting;
+			break;
+
+		case SetDenied:
+			m_state = Denied;
+			break;
+
+		/* Init SetDefinitionsSent SetMediaSent */
+		default:
+			assert("Invalid client state transition!" == 0);
+		}
+		break;
+
+	case InitDone:
+		switch(event)
+		{
+		case SetDefinitionsSent:
+			m_state = DefinitionsSent;
+			break;
+
+		case Disconnect:
+			m_state = Disconnecting;
+			break;
+
+		case SetDenied:
+			m_state = Denied;
+			break;
+
+		/* Init GotInit2 SetMediaSent */
+		default:
+			assert("Invalid client state transition!" == 0);
+		}
+		break;
+
+	case DefinitionsSent:
+		switch(event)
+		{
+		case SetMediaSent:
+			m_state = Active;
+			break;
+
+		case Disconnect:
+			m_state = Disconnecting;
+			break;
+
+		case SetDenied:
+			m_state = Denied;
+			break;
+
+		/* Init GotInit2 SetDefinitionsSent */
+		default:
+			assert("Invalid client state transition!" == 0);
+		}
+		break;
+
+	case Active:
+		switch(event)
+		{
+		case SetDenied:
+			m_state = Denied;
+			break;
+
+		case Disconnect:
+			m_state = Disconnecting;
+			break;
+
+		/* Init GotInit2 SetDefinitionsSent SetMediaSent SetDenied */
+		default:
+			assert("Invalid client state transition!" == 0);
+			break;
+		}
+		break;
+
+	case Disconnecting:
+		/* we are already disconnecting */
+		break;
+	}
+}
+
+ClientInterface::ClientInterface(con::Connection* con)
+:
+	m_con(con),
+	m_env(NULL),
+	m_print_info_timer(0.0)
+{
+
+}
+ClientInterface::~ClientInterface()
+{
+	/*
+		Delete clients
+	*/
+	{
+		JMutexAutoLock clientslock(m_clients_mutex);
+
+		for(std::map<u16, RemoteClient*>::iterator
+			i = m_clients.begin();
+			i != m_clients.end(); ++i)
+		{
+
+			// Delete client
+			delete i->second;
+		}
+	}
+}
+
+std::list<u16> ClientInterface::getClientIDs(ClientState min_state)
+{
+	std::list<u16> reply;
+	JMutexAutoLock clientslock(m_clients_mutex);
+
+	for(std::map<u16, RemoteClient*>::iterator
+		i = m_clients.begin();
+		i != m_clients.end(); ++i)
+	{
+		if (i->second->getState() >= min_state)
+			reply.push_back(i->second->peer_id);
+	}
+
+	return reply;
+}
+
+std::vector<std::string> ClientInterface::getPlayerNames()
+{
+	return m_clients_names;
+}
+
+
+void ClientInterface::step(float dtime)
+{
+	m_print_info_timer += dtime;
+	if(m_print_info_timer >= 30.0)
+	{
+		m_print_info_timer = 0.0;
+		UpdatePlayerList();
+	}
+}
+
+void ClientInterface::UpdatePlayerList()
+{
+	if (m_env != NULL)
+		{
+		std::list<u16> clients = getClientIDs();
+		m_clients_names.clear();
+
+
+		if(clients.size() != 0)
+			infostream<<"Players:"<<std::endl;
+		for(std::list<u16>::iterator
+			i = clients.begin();
+			i != clients.end(); ++i)
+		{
+			Player *player = m_env->getPlayer(*i);
+			if(player==NULL)
+				continue;
+			infostream<<"* "<<player->getName()<<"\t";
+
+			{
+				JMutexAutoLock clientslock(m_clients_mutex);
+				RemoteClient* client = lockedGetClientNoEx(*i);
+				if(client != NULL)
+					client->PrintInfo(infostream);
+			}
+			m_clients_names.push_back(player->getName());
+		}
+	}
+}
+
+void ClientInterface::send(u16 peer_id,u8 channelnum,
+		SharedBuffer<u8> data, bool reliable)
+{
+	m_con->Send(peer_id, channelnum, data, reliable);
+}
+
+void ClientInterface::sendToAll(u16 channelnum,
+		SharedBuffer<u8> data, bool reliable)
+{
+	JMutexAutoLock clientslock(m_clients_mutex);
+	for(std::map<u16, RemoteClient*>::iterator
+		i = m_clients.begin();
+		i != m_clients.end(); ++i)
+	{
+		RemoteClient *client = i->second;
+
+		if (client->net_proto_version != 0)
+		{
+			m_con->Send(client->peer_id, channelnum, data, reliable);
+		}
+	}
+}
+
+RemoteClient* ClientInterface::getClientNoEx(u16 peer_id, ClientState state_min)
+{
+	JMutexAutoLock clientslock(m_clients_mutex);
+	std::map<u16, RemoteClient*>::iterator n;
+	n = m_clients.find(peer_id);
+	// The client may not exist; clients are immediately removed if their
+	// access is denied, and this event occurs later then.
+	if(n == m_clients.end())
+		return NULL;
+
+	if (n->second->getState() >= state_min)
+		return n->second;
+	else
+		return NULL;
+}
+
+RemoteClient* ClientInterface::lockedGetClientNoEx(u16 peer_id, ClientState state_min)
+{
+	std::map<u16, RemoteClient*>::iterator n;
+	n = m_clients.find(peer_id);
+	// The client may not exist; clients are immediately removed if their
+	// access is denied, and this event occurs later then.
+	if(n == m_clients.end())
+		return NULL;
+
+	if (n->second->getState() >= state_min)
+		return n->second;
+	else
+		return NULL;
+}
+
+ClientState ClientInterface::getClientState(u16 peer_id)
+{
+	JMutexAutoLock clientslock(m_clients_mutex);
+	std::map<u16, RemoteClient*>::iterator n;
+	n = m_clients.find(peer_id);
+	// The client may not exist; clients are immediately removed if their
+	// access is denied, and this event occurs later then.
+	if(n == m_clients.end())
+		return Invalid;
+
+	return n->second->getState();
+}
+
+void ClientInterface::setPlayerName(u16 peer_id,std::string name)
+{
+	JMutexAutoLock clientslock(m_clients_mutex);
+	std::map<u16, RemoteClient*>::iterator n;
+	n = m_clients.find(peer_id);
+	// The client may not exist; clients are immediately removed if their
+	// access is denied, and this event occurs later then.
+	if(n != m_clients.end())
+		n->second->setName(name);
+}
+
+void ClientInterface::DeleteClient(u16 peer_id)
+{
+	JMutexAutoLock conlock(m_clients_mutex);
+
+	// Error check
+	std::map<u16, RemoteClient*>::iterator n;
+	n = m_clients.find(peer_id);
+	// The client may not exist; clients are immediately removed if their
+	// access is denied, and this event occurs later then.
+	if(n == m_clients.end())
+		return;
+
+	/*
+		Mark objects to be not known by the client
+	*/
+	//TODO this should be done by client destructor!!!
+	RemoteClient *client = n->second;
+	// Handle objects
+	for(std::set<u16>::iterator
+			i = client->m_known_objects.begin();
+			i != client->m_known_objects.end(); ++i)
+	{
+		// Get object
+		u16 id = *i;
+		ServerActiveObject* obj = m_env->getActiveObject(id);
+
+		if(obj && obj->m_known_by_count > 0)
+			obj->m_known_by_count--;
+	}
+
+	// Delete client
+	delete m_clients[peer_id];
+	m_clients.erase(peer_id);
+}
+
+void ClientInterface::CreateClient(u16 peer_id)
+{
+	JMutexAutoLock conlock(m_clients_mutex);
+
+	// Error check
+	std::map<u16, RemoteClient*>::iterator n;
+	n = m_clients.find(peer_id);
+	// The client shouldn't already exist
+	if(n != m_clients.end()) return;
+
+	// Create client
+	RemoteClient *client = new RemoteClient();
+	client->peer_id = peer_id;
+	m_clients[client->peer_id] = client;
+}
+
+void ClientInterface::event(u16 peer_id, ClientStateEvent event)
+{
+	{
+		JMutexAutoLock clientlock(m_clients_mutex);
+
+		// Error check
+		std::map<u16, RemoteClient*>::iterator n;
+		n = m_clients.find(peer_id);
+
+		// No client to deliver event
+		if (n == m_clients.end())
+			return;
+		n->second->notifyEvent(event);
+	}
+
+	if ((event == SetMediaSent) || (event == Disconnect) || (event == SetDenied))
+	{
+		UpdatePlayerList();
+	}
+}
+
+u16 ClientInterface::getProtocolVersion(u16 peer_id)
+{
+	JMutexAutoLock conlock(m_clients_mutex);
+
+	// Error check
+	std::map<u16, RemoteClient*>::iterator n;
+	n = m_clients.find(peer_id);
+
+	// No client to deliver event
+	if (n == m_clients.end())
+		return 0;
+
+	return n->second->net_proto_version;
+}

src/clientiface.h

@@ -0,0 +1,306 @@
+/*
+Minetest
+Copyright (C) 2010-2014 celeron55, Perttu Ahola <celeron55@gmail.com>
+
+This program is free software; you can redistribute it and/or modify
+it under the terms of the GNU Lesser General Public License as published by
+the Free Software Foundation; either version 2.1 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU Lesser General Public License for more details.
+
+You should have received a copy of the GNU Lesser General Public License along
+with this program; if not, write to the Free Software Foundation, Inc.,
+51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+*/
+#ifndef _CLIENTIFACE_H_
+#define _CLIENTIFACE_H_
+
+#include "irr_v3d.h"                   // for irrlicht datatypes
+
+#include "constants.h"
+#include "serialization.h"             // for SER_FMT_VER_INVALID
+#include "jthread/jmutex.h"
+
+#include <list>
+#include <vector>
+#include <map>
+#include <set>
+
+class MapBlock;
+class ServerEnvironment;
+class EmergeManager;
+
+namespace con {
+	class Connection;
+}
+
+enum ClientState
+{
+	Invalid,
+	Disconnecting,
+	Denied,
+	Created,
+	InitSent,
+	InitDone,
+	DefinitionsSent,
+	Active
+};
+
+enum ClientStateEvent
+{
+	Init,
+	GotInit2,
+	SetDenied,
+	SetDefinitionsSent,
+	SetMediaSent,
+	Disconnect
+};
+
+/*
+	Used for queueing and sorting block transfers in containers
+
+	Lower priority number means higher priority.
+*/
+struct PrioritySortedBlockTransfer
+{
+	PrioritySortedBlockTransfer(float a_priority, v3s16 a_pos, u16 a_peer_id)
+	{
+		priority = a_priority;
+		pos = a_pos;
+		peer_id = a_peer_id;
+	}
+	bool operator < (const PrioritySortedBlockTransfer &other) const
+	{
+		return priority < other.priority;
+	}
+	float priority;
+	v3s16 pos;
+	u16 peer_id;
+};
+
+class RemoteClient
+{
+public:
+	// peer_id=0 means this client has no associated peer
+	// NOTE: If client is made allowed to exist while peer doesn't,
+	//       this has to be set to 0 when there is no peer.
+	//       Also, the client must be moved to some other container.
+	u16 peer_id;
+	// The serialization version to use with the client
+	u8 serialization_version;
+	//
+	u16 net_proto_version;
+
+	RemoteClient():
+		peer_id(PEER_ID_INEXISTENT),
+		serialization_version(SER_FMT_VER_INVALID),
+		net_proto_version(0),
+		m_time_from_building(9999),
+		m_pending_serialization_version(SER_FMT_VER_INVALID),
+		m_state(Created),
+		m_nearest_unsent_d(0),
+		m_nearest_unsent_reset_timer(0.0),
+		m_excess_gotblocks(0),
+		m_nothing_to_send_counter(0),
+		m_nothing_to_send_pause_timer(0.0),
+		m_name("")
+	{
+	}
+	~RemoteClient()
+	{
+	}
+
+	/*
+		Finds block that should be sent next to the client.
+		Environment should be locked when this is called.
+		dtime is used for resetting send radius at slow interval
+	*/
+	void GetNextBlocks(ServerEnvironment *env, EmergeManager* emerge,
+			float dtime, std::vector<PrioritySortedBlockTransfer> &dest);
+
+	void GotBlock(v3s16 p);
+
+	void SentBlock(v3s16 p);
+
+	void SetBlockNotSent(v3s16 p);
+	void SetBlocksNotSent(std::map<v3s16, MapBlock*> &blocks);
+
+	s32 SendingCount()
+	{
+		return m_blocks_sending.size();
+	}
+
+	// Increments timeouts and removes timed-out blocks from list
+	// NOTE: This doesn't fix the server-not-sending-block bug
+	//       because it is related to emerging, not sending.
+	//void RunSendingTimeouts(float dtime, float timeout);
+
+	void PrintInfo(std::ostream &o)
+	{
+		o<<"RemoteClient "<<peer_id<<": "
+				<<"m_blocks_sent.size()="<<m_blocks_sent.size()
+				<<", m_blocks_sending.size()="<<m_blocks_sending.size()
+				<<", m_nearest_unsent_d="<<m_nearest_unsent_d
+				<<", m_excess_gotblocks="<<m_excess_gotblocks
+				<<std::endl;
+		m_excess_gotblocks = 0;
+	}
+
+	// Time from last placing or removing blocks
+	float m_time_from_building;
+
+	/*
+		List of active objects that the client knows of.
+		Value is dummy.
+	*/
+	std::set<u16> m_known_objects;
+
+	ClientState getState()
+		{ return m_state; }
+
+	std::string getName()
+		{ return m_name; }
+
+	void setName(std::string name)
+		{ m_name = name; }
+
+	/* update internal client state */
+	void notifyEvent(ClientStateEvent event);
+
+	/* set expected serialization version */
+	void setPendingSerializationVersion(u8 version)
+		{ m_pending_serialization_version = version; }
+
+	void confirmSerializationVersion()
+		{ serialization_version = m_pending_serialization_version; }
+
+private:
+	// Version is stored in here after INIT before INIT2
+	u8 m_pending_serialization_version;
+
+	/* current state of client */
+	ClientState m_state;
+
+	/*
+		Blocks that have been sent to client.
+		- These don't have to be sent again.
+		- A block is cleared from here when client says it has
+		  deleted it from it's memory
+
+		Key is position, value is dummy.
+		No MapBlock* is stored here because the blocks can get deleted.
+	*/
+	std::set<v3s16> m_blocks_sent;
+	s16 m_nearest_unsent_d;
+	v3s16 m_last_center;
+	float m_nearest_unsent_reset_timer;
+
+	/*
+		Blocks that are currently on the line.
+		This is used for throttling the sending of blocks.
+		- The size of this list is limited to some value
+		Block is added when it is sent with BLOCKDATA.
+		Block is removed when GOTBLOCKS is received.
+		Value is time from sending. (not used at the moment)
+	*/
+	std::map<v3s16, float> m_blocks_sending;
+
+	/*
+		Count of excess GotBlocks().
+		There is an excess amount because the client sometimes
+		gets a block so late that the server sends it again,
+		and the client then sends two GOTBLOCKs.
+		This is resetted by PrintInfo()
+	*/
+	u32 m_excess_gotblocks;
+
+	// CPU usage optimization
+	u32 m_nothing_to_send_counter;
+	float m_nothing_to_send_pause_timer;
+	std::string m_name;
+};
+
+class ClientInterface {
+public:
+
+	friend class Server;
+
+	ClientInterface(con::Connection* con);
+	~ClientInterface();
+
+	/* run sync step */
+	void step(float dtime);
+
+	/* get list of active client id's */
+	std::list<u16> getClientIDs(ClientState min_state=Active);
+
+	/* get list of client player names */
+	std::vector<std::string> getPlayerNames();
+
+	/* send message to client */
+	void send(u16 peer_id, u8 channelnum, SharedBuffer<u8> data, bool reliable);
+
+	/* send to all clients */
+	void sendToAll(u16 channelnum, SharedBuffer<u8> data, bool reliable);
+
+	/* delete a client */
+	void DeleteClient(u16 peer_id);
+
+	/* create client */
+	void CreateClient(u16 peer_id);
+
+	/* get a client by peer_id */
+	RemoteClient* getClientNoEx(u16 peer_id,  ClientState state_min=Active);
+
+	/* get client by peer_id (make sure you have list lock before!*/
+	RemoteClient* lockedGetClientNoEx(u16 peer_id,  ClientState state_min=Active);
+
+	/* get state of client by id*/
+	ClientState getClientState(u16 peer_id);
+
+	/* set client playername */
+	void setPlayerName(u16 peer_id,std::string name);
+
+	/* get protocol version of client */
+	u16 getProtocolVersion(u16 peer_id);
+
+	/* event to update client state */
+	void event(u16 peer_id, ClientStateEvent event);
+
+	/* set environment */
+	void setEnv(ServerEnvironment* env)
+	{ assert(m_env == 0); m_env = env; }
+
+protected:
+	//TODO find way to avoid this functions
+	void Lock()
+		{ m_clients_mutex.Lock(); }
+	void Unlock()
+		{ m_clients_mutex.Unlock(); }
+
+	std::map<u16, RemoteClient*>& getClientList()
+		{ return m_clients; }
+
+private:
+	/* update internal player list */
+	void UpdatePlayerList();
+
+	// Connection
+	con::Connection* m_con;
+	JMutex m_clients_mutex;
+	// Connected clients (behind the con mutex)
+	std::map<u16, RemoteClient*> m_clients;
+	std::vector<std::string> m_clients_names; //for announcing masterserver
+
+	// Environment
+	ServerEnvironment *m_env;
+	JMutex m_env_mutex;
+
+	float m_print_info_timer;
+};
+
+#endif

src/clientmedia.cpp

@@ -480,13 +480,7 @@ void ClientMediaDownloader::startConventionalTransfers(Client *client)
 {
 	assert(m_httpfetch_active == 0);
 
-	if (m_uncached_received_count == m_uncached_count) {
+	if (m_uncached_received_count != m_uncached_count) {
-		// In this case all media was found in the cache or
-		// has been downloaded from some remote server;
-		// report this fact to the server
-		client->received_media();
-	}
-	else {
 		// Some media files have not been received yet, use the
 		// conventional slow method (minetest protocol) to get them
 		std::list<std::string> file_requests;

src/connection.cpp

@@ -34,6 +34,14 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 namespace con
 {
 
+/******************************************************************************/
+/* defines used for debugging and profiling                                   */
+/******************************************************************************/
+#ifdef NDEBUG
+#define LOG(a) a
+#define PROFILE(a)
+#undef DEBUG_CONNECTION_KBPS
+#else
 /* this mutex is used to achieve log message consistency */
 JMutex log_message_mutex;
 #define LOG(a)                                                                 \
@@ -41,15 +49,10 @@ JMutex log_message_mutex;
 	JMutexAutoLock loglock(log_message_mutex);                                 \
 	a;                                                                         \
 	}
-
-/******************************************************************************/
-/* defines used for debugging and profiling                                   */
-/******************************************************************************/
 #define PROFILE(a) a
-//#define PROFILE(a)
-
 //#define DEBUG_CONNECTION_KBPS
 #undef DEBUG_CONNECTION_KBPS
+#endif
 
 
 static inline float CALC_DTIME(unsigned int lasttime, unsigned int curtime) {
@@ -960,15 +963,12 @@ void Peer::Drop()
 
 UDPPeer::UDPPeer(u16 a_id, Address a_address, Connection* connection) :
 	Peer(a_address,a_id,connection),
+	m_pending_disconnect(false),
 	resend_timeout(0.5),
 	m_legacy_peer(true)
 {
 }
 
-UDPPeer::~UDPPeer()
-{
-}
-
 bool UDPPeer::getAddress(MTProtocols type,Address& toset)
 {
 	if ((type == UDP) || (type == MINETEST_RELIABLE_UDP) || (type == PRIMARY))
@@ -980,6 +980,15 @@ bool UDPPeer::getAddress(MTProtocols type,Address& toset)
 	return false;
 }
 
+void UDPPeer::setNonLegacyPeer()
+{
+	m_legacy_peer = false;
+	for(unsigned int i=0; i< CHANNEL_COUNT; i++)
+	{
+		channels->setWindowSize(g_settings->getU16("max_packets_per_iteration"));
+	}
+}
+
 void UDPPeer::reportRTT(float rtt)
 {
 	if (rtt < 0.0) {
@@ -1014,6 +1023,9 @@ bool UDPPeer::Ping(float dtime,SharedBuffer<u8>& data)
 void UDPPeer::PutReliableSendCommand(ConnectionCommand &c,
 		unsigned int max_packet_size)
 {
+	if (m_pending_disconnect)
+		return;
+
 	if ( channels[c.channelnum].queued_commands.empty() &&
 			/* don't queue more packets then window size */
 			(channels[c.channelnum].queued_reliables.size()
@@ -1040,6 +1052,9 @@ bool UDPPeer::processReliableSendCommand(
 				ConnectionCommand &c,
 				unsigned int max_packet_size)
 {
+	if (m_pending_disconnect)
+		return true;
+
 	u32 chunksize_max = max_packet_size
 							- BASE_HEADER_SIZE
 							- RELIABLE_HEADER_SIZE;
@@ -1564,7 +1579,6 @@ void ConnectionSendThread::processReliableCommand(ConnectionCommand &c)
 	case CONNCMD_SERVE:
 	case CONNCMD_CONNECT:
 	case CONNCMD_DISCONNECT:
-	case CONNCMD_DELETE_PEER:
 	case CONCMD_ACK:
 		assert("Got command that shouldn't be reliable as reliable command" == 0);
 	default:
@@ -1606,10 +1620,6 @@ void ConnectionSendThread::processNonReliableCommand(ConnectionCommand &c)
 		LOG(dout_con<<m_connection->getDesc()<<" UDP processing CONNCMD_SEND_TO_ALL"<<std::endl);
 		sendToAll(c.channelnum, c.data);
 		return;
-	case CONNCMD_DELETE_PEER:
-		LOG(dout_con<<m_connection->getDesc()<<" UDP processing CONNCMD_DELETE_PEER"<<std::endl);
-		m_connection->deletePeer(c.peer_id, false);
-		return;
 	case CONCMD_ACK:
 		LOG(dout_con<<m_connection->getDesc()<<" UDP processing CONCMD_ACK"<<std::endl);
 		sendAsPacket(c.peer_id,c.channelnum,c.data,true);
@@ -1686,6 +1696,18 @@ void ConnectionSendThread::disconnect_peer(u16 peer_id)
 	writeU8(&data[0], TYPE_CONTROL);
 	writeU8(&data[1], CONTROLTYPE_DISCO);
 	sendAsPacket(peer_id, 0,data,false);
+
+	PeerHelper peer = m_connection->getPeerNoEx(peer_id);
+
+	if (!peer)
+		return;
+
+	if (dynamic_cast<UDPPeer*>(&peer) == 0)
+	{
+		return;
+	}
+
+	dynamic_cast<UDPPeer*>(&peer)->m_pending_disconnect = true;
 }
 
 void ConnectionSendThread::send(u16 peer_id, u8 channelnum,
@@ -1764,6 +1786,8 @@ void ConnectionSendThread::sendToAllReliable(ConnectionCommand &c)
 void ConnectionSendThread::sendPackets(float dtime)
 {
 	std::list<u16> peerIds = m_connection->getPeerIDs();
+	std::list<u16> pendingDisconnect;
+	std::map<u16,bool> pending_unreliable;
 
 	for(std::list<u16>::iterator
 			j = peerIds.begin();
@@ -1782,6 +1806,11 @@ void ConnectionSendThread::sendPackets(float dtime)
 			continue;
 		}
 
+		if (dynamic_cast<UDPPeer*>(&peer)->m_pending_disconnect)
+		{
+			pendingDisconnect.push_back(*j);
+		}
+
 		PROFILE(std::stringstream peerIdentifier);
 		PROFILE(peerIdentifier << "sendPackets[" << m_connection->getDesc() << ";" << *j << ";RELIABLE]");
 		PROFILE(ScopeProfiler peerprofiler(g_profiler, peerIdentifier.str(), SPT_AVG));
@@ -1877,6 +1906,17 @@ void ConnectionSendThread::sendPackets(float dtime)
 		}
 		else {
 			m_outgoing_queue.push_back(packet);
+			pending_unreliable[packet.peer_id] = true;
+		}
+	}
+
+	for(std::list<u16>::iterator
+				k = pendingDisconnect.begin();
+				k != pendingDisconnect.end(); ++k)
+	{
+		if (!pending_unreliable[*k])
+		{
+			m_connection->deletePeer(*k,false);
 		}
 	}
 }
@@ -1986,11 +2026,10 @@ void * ConnectionReceiveThread::Thread()
 // Receive packets from the network and buffers and create ConnectionEvents
 void ConnectionReceiveThread::receive()
 {
-	/* now reorder reliables */
+	// use IPv6 minimum allowed MTU as receive buffer size as this is
-	u32 datasize = m_max_packet_size * 2;  // Double it just to be safe
+	// theoretical reliable upper boundary of a udp packet for all IPv6 enabled
-	// TODO: We can not know how many layers of header there are.
+	// infrastructure
-	// For now, just assume there are no other than the base headers.
+	unsigned int packet_maxsize = 1500;
-	u32 packet_maxsize = datasize + BASE_HEADER_SIZE;
 	SharedBuffer<u8> packetdata(packet_maxsize);
 	
 	bool packet_queued = true;
@@ -2126,7 +2165,7 @@ void ConnectionReceiveThread::receive()
 			
 			LOG(dout_con<<m_connection->getDesc()
 					<<" ProcessPacket from peer_id: " << peer_id
-					<< ",channel: " << channelnum << ", returned "
+					<< ",channel: " << (channelnum & 0xFF) << ", returned "
 					<< resultdata.getSize() << " bytes" <<std::endl);
 			
 			ConnectionEvent e;
@@ -2262,6 +2301,10 @@ SharedBuffer<u8> ConnectionReceiveThread::processPacket(Channel *channel,
 				}
 				//put bytes for max bandwidth calculation
 				channel->UpdateBytesSent(p.data.getSize(),1);
+				if (channel->outgoing_reliables_sent.size() == 0)
+				{
+					m_connection->TriggerSend();
+				}
 			}
 			catch(NotFoundException &e){
 				LOG(derr_con<<m_connection->getDesc()
@@ -2534,7 +2577,8 @@ Connection::Connection(u32 protocol_id, u32 max_packet_size, float timeout,
 	m_info_mutex(),
 	m_bc_peerhandler(0),
 	m_bc_receive_timeout(0),
-	m_shutting_down(false)
+	m_shutting_down(false),
+	m_next_remote_peer_id(2)
 {
 	m_udpSocket.setTimeoutMs(5);
 
@@ -2554,7 +2598,8 @@ Connection::Connection(u32 protocol_id, u32 max_packet_size, float timeout,
 	m_info_mutex(),
 	m_bc_peerhandler(peerhandler),
 	m_bc_receive_timeout(0),
-	m_shutting_down(false)
+	m_shutting_down(false),
+	m_next_remote_peer_id(2)
 
 {
 	m_udpSocket.setTimeoutMs(5);
@@ -2810,11 +2855,6 @@ void Connection::Send(u16 peer_id, u8 channelnum,
 	putCommand(c);
 }
 
-void Connection::RunTimeouts(float dtime)
-{
-	// No-op
-}
-
 Address Connection::GetPeerAddress(u16 peer_id)
 {
 	PeerHelper peer = getPeerNoEx(peer_id);
@@ -2838,47 +2878,44 @@ u16 Connection::createPeer(Address& sender, MTProtocols protocol, int fd)
 	// Somebody wants to make a new connection
 
 	// Get a unique peer id (2 or higher)
-	u16 peer_id_new = 2;
+	u16 peer_id_new = m_next_remote_peer_id;
 	u16 overflow =  MAX_UDP_PEERS;
 
 	/*
 		Find an unused peer id
 	*/
-	bool out_of_ids = false;
-	for(;;)
 	{
-		// Check if exists
+	JMutexAutoLock lock(m_peers_mutex);
-		if(m_peers.find(peer_id_new) == m_peers.end())
+		bool out_of_ids = false;
-			break;
+		for(;;)
-		// Check for overflow
+		{
-		if(peer_id_new == overflow){
+			// Check if exists
-			out_of_ids = true;
+			if(m_peers.find(peer_id_new) == m_peers.end())
-			break;
+				break;
+			// Check for overflow
+			if(peer_id_new == overflow){
+				out_of_ids = true;
+				break;
+			}
+			peer_id_new++;
 		}
-		peer_id_new++;
+		if(out_of_ids){
-	}
+			errorstream<<getDesc()<<" ran out of peer ids"<<std::endl;
-	if(out_of_ids){
+			return PEER_ID_INEXISTENT;
-		errorstream<<getDesc()<<" ran out of peer ids"<<std::endl;
+		}
-		return PEER_ID_INEXISTENT;
+
+		// Create a peer
+		Peer *peer = 0;
+		peer = new UDPPeer(peer_id_new, sender, this);
+
+		m_peers[peer->id] = peer;
 	}
 
+	m_next_remote_peer_id = (peer_id_new +1) % MAX_UDP_PEERS;
+
 	LOG(dout_con<<getDesc()
 			<<"createPeer(): giving peer_id="<<peer_id_new<<std::endl);
 
-	// Create a peer
-	Peer *peer = 0;
-
-	peer = new UDPPeer(peer_id_new, sender, this);
-
-	m_peers_mutex.Lock();
-	m_peers[peer->id] = peer;
-	m_peers_mutex.Unlock();
-
-	// Create peer addition event
-	ConnectionEvent e;
-	e.peerAdded(peer_id_new, sender);
-	putEvent(e);
-
 	ConnectionCommand cmd;
 	SharedBuffer<u8> reply(4);
 	writeU8(&reply[0], TYPE_CONTROL);
@@ -2887,17 +2924,15 @@ u16 Connection::createPeer(Address& sender, MTProtocols protocol, int fd)
 	cmd.createPeer(peer_id_new,reply);
 	this->putCommand(cmd);
 
+	// Create peer addition event
+	ConnectionEvent e;
+	e.peerAdded(peer_id_new, sender);
+	putEvent(e);
+
 	// We're now talking to a valid peer_id
 	return peer_id_new;
 }
 
-void Connection::DeletePeer(u16 peer_id)
-{
-	ConnectionCommand c;
-	c.deletePeer(peer_id);
-	putCommand(c);
-}
-
 void Connection::PrintInfo(std::ostream &out)
 {
 	m_info_mutex.Lock();
@@ -2915,6 +2950,13 @@ const std::string Connection::getDesc()
 	return std::string("con(")+itos(m_udpSocket.GetHandle())+"/"+itos(m_peer_id)+")";
 }
 
+void Connection::DisconnectPeer(u16 peer_id)
+{
+	ConnectionCommand discon;
+	discon.disconnect_peer(peer_id);
+	putCommand(discon);
+}
+
 void Connection::sendAck(u16 peer_id, u8 channelnum, u16 seqnum) {
 
 	assert(channelnum < CHANNEL_COUNT);

src/connection.h

@@ -71,14 +71,6 @@ public:
 	{}
 };
 
-/*class ThrottlingException : public BaseException
-{
-public:
-	ThrottlingException(const char *s):
-		BaseException(s)
-	{}
-};*/
-
 class InvalidIncomingDataException : public BaseException
 {
 public:
@@ -406,7 +398,6 @@ enum ConnectionCommandType{
 	CONNCMD_DISCONNECT_PEER,
 	CONNCMD_SEND,
 	CONNCMD_SEND_TO_ALL,
-	CONNCMD_DELETE_PEER,
 	CONCMD_ACK,
 	CONCMD_CREATE_PEER,
 	CONCMD_DISABLE_LEGACY
@@ -460,11 +451,6 @@ struct ConnectionCommand
 		data = data_;
 		reliable = reliable_;
 	}
-	void deletePeer(u16 peer_id_)
-	{
-		type = CONNCMD_DELETE_PEER;
-		peer_id = peer_id_;
-	}
 
 	void ack(u16 peer_id_, u8 channelnum_, SharedBuffer<u8> data_)
 	{
@@ -580,16 +566,29 @@ private:
 
 class Peer;
 
+enum PeerChangeType
+{
+	PEER_ADDED,
+	PEER_REMOVED
+};
+struct PeerChange
+{
+	PeerChangeType type;
+	u16 peer_id;
+	bool timeout;
+};
+
 class PeerHandler
 {
 public:
+
 	PeerHandler()
 	{
 	}
 	virtual ~PeerHandler()
 	{
 	}
-	
+
 	/*
 		This is called after the Peer has been inserted into the
 		Connection's peer container.
@@ -771,7 +770,7 @@ public:
 	friend class ConnectionSendThread;
 
 	UDPPeer(u16 a_id, Address a_address, Connection* connection);
-	virtual ~UDPPeer();
+	virtual ~UDPPeer() {};
 
 	void PutReliableSendCommand(ConnectionCommand &c,
 							unsigned int max_packet_size);
@@ -781,8 +780,7 @@ public:
 
 	bool getAddress(MTProtocols type, Address& toset);
 
-	void setNonLegacyPeer()
+	void setNonLegacyPeer();
-	{ m_legacy_peer = false; }
 
 	bool getLegacyPeer()
 	{ return m_legacy_peer; }
@@ -793,6 +791,8 @@ public:
 	SharedBuffer<u8> addSpiltPacket(u8 channel,
 									BufferedPacket toadd,
 									bool reliable);
+
+
 protected:
 	/*
 		Calculates avg_rtt and resend_timeout.
@@ -813,6 +813,7 @@ protected:
 	bool Ping(float dtime,SharedBuffer<u8>& data);
 
 	Channel channels[CHANNEL_COUNT];
+	bool m_pending_disconnect;
 private:
 	// This is changed dynamically
 	float resend_timeout;
@@ -1002,13 +1003,12 @@ public:
 	u32 Receive(u16 &peer_id, SharedBuffer<u8> &data);
 	void SendToAll(u8 channelnum, SharedBuffer<u8> data, bool reliable);
 	void Send(u16 peer_id, u8 channelnum, SharedBuffer<u8> data, bool reliable);
-	void RunTimeouts(float dtime); // dummy
 	u16 GetPeerID(){ return m_peer_id; }
 	Address GetPeerAddress(u16 peer_id);
 	float GetPeerAvgRTT(u16 peer_id);
-	void DeletePeer(u16 peer_id);
 	const u32 GetProtocolID() const { return m_protocol_id; };
 	const std::string getDesc();
+	void DisconnectPeer(u16 peer_id);
 
 protected:
 	PeerHelper getPeer(u16 peer_id);
@@ -1033,6 +1033,8 @@ protected:
 
 	void putEvent(ConnectionEvent &e);
 
+	void TriggerSend()
+		{ m_sendThread.Trigger(); }
 private:
 	std::list<Peer*> getPeers();
 
@@ -1054,6 +1056,8 @@ private:
 	int m_bc_receive_timeout;
 
 	bool m_shutting_down;
+
+	u16 m_next_remote_peer_id;
 };
 
 } // namespace

src/emerge.cpp

@@ -592,23 +592,12 @@ void *EmergeThread::Thread() {
 		/*
 			Set sent status of modified blocks on clients
 		*/
-
-		// NOTE: Server's clients are also behind the connection mutex
-		//conlock: consistently takes 30-40ms to acquire
-		JMutexAutoLock lock(m_server->m_con_mutex);
 		// Add the originally fetched block to the modified list
 		if (block)
 			modified_blocks[p] = block;
 
-		// Set the modified blocks unsent for all the clients
+		if (modified_blocks.size() > 0) {
-		for (std::map<u16, RemoteClient*>::iterator
+			m_server->SetBlocksNotSent(modified_blocks);
-			 i = m_server->m_clients.begin();
-			 i != m_server->m_clients.end(); ++i) {
-			RemoteClient *client = i->second;
-			if (modified_blocks.size() > 0) {
-				// Remove block from sent history
-				client->SetBlocksNotSent(modified_blocks);
-			}
 		}
 	}
 	catch (VersionMismatchException &e) {

src/server.h

@@ -33,6 +33,7 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 #include "util/numeric.h"
 #include "util/thread.h"
 #include "environment.h"
+#include "clientiface.h"
 #include <string>
 #include <list>
 #include <map>
@@ -53,14 +54,19 @@ class EmergeManager;
 class GameScripting;
 class ServerEnvironment;
 struct SimpleSoundSpec;
+class ServerThread;
 
+enum ClientDeletionReason {
+	CDR_LEAVE,
+	CDR_TIMEOUT,
+	CDR_DENY
+};
 
 /*
 	Some random functions
 */
 v3f findSpawnPos(ServerMap &map);
 
-
 class MapEditEventIgnorer
 {
 public:
@@ -111,31 +117,6 @@ private:
 	VoxelArea *m_ignorevariable;
 };
 
-class Server;
-class ServerThread;
-
-/*
-	Used for queueing and sorting block transfers in containers
-
-	Lower priority number means higher priority.
-*/
-struct PrioritySortedBlockTransfer
-{
-	PrioritySortedBlockTransfer(float a_priority, v3s16 a_pos, u16 a_peer_id)
-	{
-		priority = a_priority;
-		pos = a_pos;
-		peer_id = a_peer_id;
-	}
-	bool operator < (const PrioritySortedBlockTransfer &other) const
-	{
-		return priority < other.priority;
-	}
-	float priority;
-	v3s16 pos;
-	u16 peer_id;
-};
-
 struct MediaInfo
 {
 	std::string path;
@@ -182,134 +163,6 @@ struct ServerPlayingSound
 	std::set<u16> clients; // peer ids
 };
 
-class RemoteClient
-{
-public:
-	// peer_id=0 means this client has no associated peer
-	// NOTE: If client is made allowed to exist while peer doesn't,
-	//       this has to be set to 0 when there is no peer.
-	//       Also, the client must be moved to some other container.
-	u16 peer_id;
-	// The serialization version to use with the client
-	u8 serialization_version;
-	//
-	u16 net_proto_version;
-	// Version is stored in here after INIT before INIT2
-	u8 pending_serialization_version;
-
-	bool definitions_sent;
-
-	bool denied;
-
-	RemoteClient():
-		m_time_from_building(9999),
-		m_excess_gotblocks(0)
-	{
-		peer_id = 0;
-		serialization_version = SER_FMT_VER_INVALID;
-		net_proto_version = 0;
-		pending_serialization_version = SER_FMT_VER_INVALID;
-		definitions_sent = false;
-		denied = false;
-		m_nearest_unsent_d = 0;
-		m_nearest_unsent_reset_timer = 0.0;
-		m_nothing_to_send_counter = 0;
-		m_nothing_to_send_pause_timer = 0;
-	}
-	~RemoteClient()
-	{
-	}
-
-	/*
-		Finds block that should be sent next to the client.
-		Environment should be locked when this is called.
-		dtime is used for resetting send radius at slow interval
-	*/
-	void GetNextBlocks(Server *server, float dtime,
-			std::vector<PrioritySortedBlockTransfer> &dest);
-
-	void GotBlock(v3s16 p);
-
-	void SentBlock(v3s16 p);
-
-	void SetBlockNotSent(v3s16 p);
-	void SetBlocksNotSent(std::map<v3s16, MapBlock*> &blocks);
-
-	s32 SendingCount()
-	{
-		return m_blocks_sending.size();
-	}
-
-	// Increments timeouts and removes timed-out blocks from list
-	// NOTE: This doesn't fix the server-not-sending-block bug
-	//       because it is related to emerging, not sending.
-	//void RunSendingTimeouts(float dtime, float timeout);
-
-	void PrintInfo(std::ostream &o)
-	{
-		o<<"RemoteClient "<<peer_id<<": "
-				<<"m_blocks_sent.size()="<<m_blocks_sent.size()
-				<<", m_blocks_sending.size()="<<m_blocks_sending.size()
-				<<", m_nearest_unsent_d="<<m_nearest_unsent_d
-				<<", m_excess_gotblocks="<<m_excess_gotblocks
-				<<std::endl;
-		m_excess_gotblocks = 0;
-	}
-
-	// Time from last placing or removing blocks
-	float m_time_from_building;
-
-	/*JMutex m_dig_mutex;
-	float m_dig_time_remaining;
-	// -1 = not digging
-	s16 m_dig_tool_item;
-	v3s16 m_dig_position;*/
-
-	/*
-		List of active objects that the client knows of.
-		Value is dummy.
-	*/
-	std::set<u16> m_known_objects;
-
-private:
-	/*
-		Blocks that have been sent to client.
-		- These don't have to be sent again.
-		- A block is cleared from here when client says it has
-		  deleted it from it's memory
-
-		Key is position, value is dummy.
-		No MapBlock* is stored here because the blocks can get deleted.
-	*/
-	std::set<v3s16> m_blocks_sent;
-	s16 m_nearest_unsent_d;
-	v3s16 m_last_center;
-	float m_nearest_unsent_reset_timer;
-
-	/*
-		Blocks that are currently on the line.
-		This is used for throttling the sending of blocks.
-		- The size of this list is limited to some value
-		Block is added when it is sent with BLOCKDATA.
-		Block is removed when GOTBLOCKS is received.
-		Value is time from sending. (not used at the moment)
-	*/
-	std::map<v3s16, float> m_blocks_sending;
-
-	/*
-		Count of excess GotBlocks().
-		There is an excess amount because the client sometimes
-		gets a block so late that the server sends it again,
-		and the client then sends two GOTBLOCKs.
-		This is resetted by PrintInfo()
-	*/
-	u32 m_excess_gotblocks;
-
-	// CPU usage optimization
-	u32 m_nothing_to_send_counter;
-	float m_nothing_to_send_pause_timer;
-};
-
 class Server : public con::PeerHandler, public MapEventReceiver,
 		public InventoryManager, public IGameDef
 {
@@ -337,11 +190,6 @@ public:
 	// Environment must be locked when called
 	void setTimeOfDay(u32 time);
 
-	bool getShutdownRequested()
-	{
-		return m_shutdown_requested;
-	}
-
 	/*
 		Shall be called with the environment locked.
 		This is accessed by the map, which is inside the environment,
@@ -358,17 +206,20 @@ public:
 	// Connection must be locked when called
 	std::wstring getStatusString();
 
-	void requestShutdown(void)
+	// read shutdown state
-	{
+	inline bool getShutdownRequested()
-		m_shutdown_requested = true;
+			{ return m_shutdown_requested; }
-	}
+
+	// request server to shutdown
+	inline void requestShutdown(void)
+			{ m_shutdown_requested = true; }
 
 	// Returns -1 if failed, sound handle on success
-	// Envlock + conlock
+	// Envlock
 	s32 playSound(const SimpleSoundSpec &spec, const ServerSoundParams &params);
 	void stopSound(s32 handle);
 
-	// Envlock + conlock
+	// Envlock
 	std::set<std::string> getPlayerEffectivePrivs(const std::string &name);
 	bool checkPriv(const std::string &name, const std::string &priv);
 	void reportPrivsModified(const std::string &name=""); // ""=all
@@ -378,12 +229,6 @@ public:
 	void unsetIpBanned(const std::string &ip_or_name);
 	std::string getBanDescription(const std::string &ip_or_name);
 
-	Address getPeerAddress(u16 peer_id)
-	{
-		return m_con.GetPeerAddress(peer_id);
-	}
-
-	// Envlock and conlock should be locked when calling this
 	void notifyPlayer(const char *name, const std::wstring msg, const bool prepend);
 	void notifyPlayers(const std::wstring msg);
 	void spawnParticle(const char *playername,
@@ -451,15 +296,14 @@ public:
 	const ModSpec* getModSpec(const std::string &modname);
 	void getModNames(std::list<std::string> &modlist);
 	std::string getBuiltinLuaPath();
+	inline std::string getWorldPath()
+			{ return m_path_world; }
 
-	std::string getWorldPath(){ return m_path_world; }
+	inline bool isSingleplayer()
+			{ return m_simple_singleplayer_mode; }
 
-	bool isSingleplayer(){ return m_simple_singleplayer_mode; }
+	inline void setAsyncFatalError(const std::string &error)
-
+			{ m_async_fatal_error.set(error); }
-	void setAsyncFatalError(const std::string &error)
-	{
-		m_async_fatal_error.set(error);
-	}
 
 	bool showFormspec(const char *name, const std::string &formspec, const std::string &formname);
 	Map & getMap() { return m_env->getMap(); }
@@ -473,41 +317,32 @@ public:
 	void hudSetHotbarImage(Player *player, std::string name);
 	void hudSetHotbarSelectedImage(Player *player, std::string name);
 
-private:
+	inline Address getPeerAddress(u16 peer_id)
+			{ return m_con.GetPeerAddress(peer_id); }
 
-	// con::PeerHandler implementation.
+	/* con::PeerHandler implementation. */
-	// These queue stuff to be processed by handlePeerChanges().
-	// As of now, these create and remove clients and players.
 	void peerAdded(con::Peer *peer);
 	void deletingPeer(con::Peer *peer, bool timeout);
 
-	/*
+private:
-		Static send methods
-	*/
 
-	static void SendMovement(con::Connection &con, u16 peer_id);
+	friend class EmergeThread;
-	static void SendHP(con::Connection &con, u16 peer_id, u8 hp);
+	friend class RemoteClient;
-	static void SendBreath(con::Connection &con, u16 peer_id, u16 breath);
-	static void SendAccessDenied(con::Connection &con, u16 peer_id,
-			const std::wstring &reason);
-	static void SendDeathscreen(con::Connection &con, u16 peer_id,
-			bool set_camera_point_target, v3f camera_point_target);
-	static void SendItemDef(con::Connection &con, u16 peer_id,
-			IItemDefManager *itemdef, u16 protocol_version);
-	static void SendNodeDef(con::Connection &con, u16 peer_id,
-			INodeDefManager *nodedef, u16 protocol_version);
 
-	/*
+	void SendMovement(u16 peer_id);
-		Non-static send methods.
+	void SendHP(u16 peer_id, u8 hp);
-		Conlock should be always used.
+	void SendBreath(u16 peer_id, u16 breath);
-		Envlock usage is documented badly but it's easy to figure out
+	void SendAccessDenied(u16 peer_id,const std::wstring &reason);
-		which ones access the environment.
+	void SendDeathscreen(u16 peer_id,bool set_camera_point_target, v3f camera_point_target);
-	*/
+	void SendItemDef(u16 peer_id,IItemDefManager *itemdef, u16 protocol_version);
+	void SendNodeDef(u16 peer_id,INodeDefManager *nodedef, u16 protocol_version);
+
+	/* mark blocks not sent for all clients */
+	void SetBlocksNotSent(std::map<v3s16, MapBlock *>& block);
 
 	// Envlock and conlock should be locked when calling these
 	void SendInventory(u16 peer_id);
 	void SendChatMessage(u16 peer_id, const std::wstring &message);
-	void BroadcastChatMessage(const std::wstring &message);
 	void SendTimeOfDay(u16 peer_id, u16 time, f32 time_speed);
 	void SendPlayerHP(u16 peer_id);
 	void SendPlayerBreath(u16 peer_id);
@@ -546,10 +381,9 @@ private:
 			const std::list<std::string> &tosend);
 
 	void sendDetachedInventory(const std::string &name, u16 peer_id);
-	void sendDetachedInventoryToAll(const std::string &name);
 	void sendDetachedInventories(u16 peer_id);
 
-	// Adds a ParticleSpawner on peer with peer_id
+	// Adds a ParticleSpawner on peer with peer_id (PEER_ID_INEXISTENT == all)
 	void SendAddParticleSpawner(u16 peer_id, u16 amount, float spawntime,
 		v3f minpos, v3f maxpos,
 		v3f minvel, v3f maxvel,
@@ -558,32 +392,14 @@ private:
 		float minsize, float maxsize,
 		bool collisiondetection, bool vertical, std::string texture, u32 id);
 
-	// Adds a ParticleSpawner on all peers
-	void SendAddParticleSpawnerAll(u16 amount, float spawntime,
-		v3f minpos, v3f maxpos,
-		v3f minvel, v3f maxvel,
-		v3f minacc, v3f maxacc,
-		float minexptime, float maxexptime,
-		float minsize, float maxsize,
-		bool collisiondetection, bool vertical, std::string texture, u32 id);
-
-	// Deletes ParticleSpawner on a single client
 	void SendDeleteParticleSpawner(u16 peer_id, u32 id);
 
-	// Deletes ParticleSpawner on all clients
+	// Spawns particle on peer with peer_id (PEER_ID_INEXISTENT == all)
-	void SendDeleteParticleSpawnerAll(u32 id);
-
-	// Spawns particle on single client
 	void SendSpawnParticle(u16 peer_id,
 		v3f pos, v3f velocity, v3f acceleration,
 		float expirationtime, float size,
 		bool collisiondetection, bool vertical, std::string texture);
 
-	// Spawns particle on all clients
-	void SendSpawnParticleAll(v3f pos, v3f velocity, v3f acceleration,
-		float expirationtime, float size,
-		bool collisiondetection, bool vertical, std::string texture);
-
 	/*
 		Something random
 	*/
@@ -591,19 +407,12 @@ private:
 	void DiePlayer(u16 peer_id);
 	void RespawnPlayer(u16 peer_id);
 	void DenyAccess(u16 peer_id, const std::wstring &reason);
-
-	enum ClientDeletionReason {
-		CDR_LEAVE,
-		CDR_TIMEOUT,
-		CDR_DENY
-	};
 	void DeleteClient(u16 peer_id, ClientDeletionReason reason);
-
 	void UpdateCrafting(u16 peer_id);
 
 	// When called, connection mutex should be locked
-	RemoteClient* getClient(u16 peer_id);
+	RemoteClient* getClient(u16 peer_id,ClientState state_min=Active);
-	RemoteClient* getClientNoEx(u16 peer_id);
+	RemoteClient* getClientNoEx(u16 peer_id,ClientState state_min=Active);
 
 	// When called, environment mutex should be locked
 	std::string getPlayerName(u16 peer_id);
@@ -618,9 +427,6 @@ private:
 	*/
 	PlayerSAO *emergePlayer(const char *name, u16 peer_id);
 
-	// Locks environment and connection by its own
-	struct PeerChange;
-	void handlePeerChange(PeerChange &c);
 	void handlePeerChanges();
 
 	/*
@@ -648,19 +454,12 @@ private:
 	float m_savemap_timer;
 	IntervalLimiter m_map_timer_and_unload_interval;
 
-	// NOTE: If connection and environment are both to be locked,
-	// environment shall be locked first.
-
 	// Environment
 	ServerEnvironment *m_env;
 	JMutex m_env_mutex;
 
-	// Connection
+	// server connection
 	con::Connection m_con;
-	JMutex m_con_mutex;
-	// Connected clients (behind the con mutex)
-	std::map<u16, RemoteClient*> m_clients;
-	std::vector<std::string> m_clients_names; //for announcing masterserver
 
 	// Ban checking
 	BanManager *m_banmanager;
@@ -701,6 +500,7 @@ private:
 	float m_step_dtime;
 	JMutex m_step_dtime_mutex;
 
+	// current server step lag counter
 	float m_lag;
 
 	// The server mainly operates in this thread
@@ -715,23 +515,17 @@ private:
 	// Uptime of server in seconds
 	MutexedVariable<double> m_uptime;
 
+	/*
+	 Client interface
+	 */
+	ClientInterface m_clients;
+
 	/*
 		Peer change queue.
 		Queues stuff from peerAdded() and deletingPeer() to
 		handlePeerChanges()
 	*/
-	enum PeerChangeType
+	Queue<con::PeerChange> m_peer_change_queue;
-	{
-		PEER_ADDED,
-		PEER_REMOVED
-	};
-	struct PeerChange
-	{
-		PeerChangeType type;
-		u16 peer_id;
-		bool timeout;
-	};
-	Queue<PeerChange> m_peer_change_queue;
 
 	/*
 		Random stuff
@@ -776,9 +570,7 @@ private:
 	*/
 	u16 m_ignore_map_edit_events_peer_id;
 
-	friend class EmergeThread;
+	// media files known to server
-	friend class RemoteClient;
-
 	std::map<std::string,MediaInfo> m_media;
 
 	/*