src/emerge.cpp

/*
Minetest
Copyright (C) 2010-2013 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 "server.h"
#include <iostream>
#include <queue>
#include <algorithm>
#include "network/networkprotocol.h"
#include "network/serveropcodes.h"
#include "ban.h"
#include "environment.h"
#include "map.h"
#include "threading/mutex_auto_lock.h"
#include "constants.h"
#include "voxel.h"
#include "config.h"
#include "version.h"
#include "filesys.h"
#include "mapblock.h"
#include "serverobject.h"
#include "genericobject.h"
#include "settings.h"
#include "profiler.h"
#include "log.h"
#include "scripting_server.h"
#include "nodedef.h"
#include "itemdef.h"
#include "craftdef.h"
#include "emerge.h"
#include "mapgen.h"
#include "mg_biome.h"
#include "content_mapnode.h"
#include "content_nodemeta.h"
#include "content_sao.h"
#include "mods.h"
#include "event_manager.h"
#include "serverlist.h"
#include "util/string.h"
#include "rollback.h"
#include "util/serialize.h"
#include "util/thread.h"
#include "defaultsettings.h"
#include "util/base64.h"
#include "util/sha1.h"
#include "util/hex.h"
#include "database.h"
#include "chatmessage.h"

class ClientNotFoundException : public BaseException
{
public:
	ClientNotFoundException(const char *s):
		BaseException(s)
	{}
};

class ServerThread : public Thread
{
public:

	ServerThread(Server *server):
		Thread("Server"),
		m_server(server)
	{}

	void *run();

private:
	Server *m_server;
};

void *ServerThread::run()
{
	DSTACK(FUNCTION_NAME);
	BEGIN_DEBUG_EXCEPTION_HANDLER

	m_server->AsyncRunStep(true);

	while (!stopRequested()) {
		try {
			//TimeTaker timer("AsyncRunStep() + Receive()");

			m_server->AsyncRunStep();

			m_server->Receive();

		} catch (con::NoIncomingDataException &e) {
		} catch (con::PeerNotFoundException &e) {
			infostream<<"Server: PeerNotFoundException"<<std::endl;
		} catch (ClientNotFoundException &e) {
		} catch (con::ConnectionBindFailed &e) {
			m_server->setAsyncFatalError(e.what());
		} catch (LuaError &e) {
			m_server->setAsyncFatalError(
					"ServerThread::run Lua: " + std::string(e.what()));
		}
	}

	END_DEBUG_EXCEPTION_HANDLER

	return NULL;
}

v3f ServerSoundParams::getPos(ServerEnvironment *env, bool *pos_exists) const
{
	if(pos_exists) *pos_exists = false;
	switch(type){
	case SSP_LOCAL:
		return v3f(0,0,0);
	case SSP_POSITIONAL:
		if(pos_exists) *pos_exists = true;
		return pos;
	case SSP_OBJECT: {
		if(object == 0)
			return v3f(0,0,0);
		ServerActiveObject *sao = env->getActiveObject(object);
		if(!sao)
			return v3f(0,0,0);
		if(pos_exists) *pos_exists = true;
		return sao->getBasePosition(); }
	}
	return v3f(0,0,0);
}


/*
	Server
*/

Server::Server(
		const std::string &path_world,
		const SubgameSpec &gamespec,
		bool simple_singleplayer_mode,
		bool ipv6,
		bool dedicated,
		ChatInterface *iface
	):
	m_path_world(path_world),
	m_gamespec(gamespec),
	m_simple_singleplayer_mode(simple_singleplayer_mode),
	m_dedicated(dedicated),
	m_async_fatal_error(""),
	m_con(PROTOCOL_ID,
			512,
			CONNECTION_TIMEOUT,
			ipv6,
			this),
	m_itemdef(createItemDefManager()),
	m_nodedef(createNodeDefManager()),
	m_craftdef(createCraftDefManager()),
	m_event(new EventManager()),
	m_uptime(0),
	m_clients(&m_con),
	m_admin_chat(iface)
{
	m_lag = g_settings->getFloat("dedicated_server_step");

	if(path_world == "")
		throw ServerError("Supplied empty world path");

	if(!gamespec.isValid())
		throw ServerError("Supplied invalid gamespec");

	infostream<<"Server created for gameid \""<<m_gamespec.id<<"\"";
	if(m_simple_singleplayer_mode)
		infostream<<" in simple singleplayer mode"<<std::endl;
	else
		infostream<<std::endl;
	infostream<<"- world:  "<<m_path_world<<std::endl;
	infostream<<"- game:   "<<m_gamespec.path<<std::endl;

	// Create world if it doesn't exist
	if(!loadGameConfAndInitWorld(m_path_world, m_gamespec))
		throw ServerError("Failed to initialize world");

	// Create server thread
	m_thread = new ServerThread(this);

	// Create emerge manager
	m_emerge = new EmergeManager(this);

	// Create ban manager
	std::string ban_path = m_path_world + DIR_DELIM "ipban.txt";
	m_banmanager = new BanManager(ban_path);

	ServerModConfiguration modconf(m_path_world);
	m_mods = modconf.getMods();
	std::vector<ModSpec> unsatisfied_mods = modconf.getUnsatisfiedMods();
	// complain about mods with unsatisfied dependencies
	if (!modconf.isConsistent()) {
		modconf.printUnsatisfiedModsError();
	}

	//lock environment
	MutexAutoLock envlock(m_env_mutex);

	// Create the Map (loads map_meta.txt, overriding configured mapgen params)
	ServerMap *servermap = new ServerMap(path_world, this, m_emerge);

	// Initialize scripting
	infostream<<"Server: Initializing Lua"<<std::endl;

	m_script = new ServerScripting(this);

	m_script->loadMod(getBuiltinLuaPath() + DIR_DELIM "init.lua", BUILTIN_MOD_NAME);

	// Print mods
	infostream << "Server: Loading mods: ";
	for (std::vector<ModSpec>::const_iterator i = m_mods.begin();
			i != m_mods.end(); ++i) {
		infostream << (*i).name << " ";
	}
	infostream << std::endl;
	// Load and run "mod" scripts
	for (std::vector<ModSpec>::const_iterator it = m_mods.begin();
			it != m_mods.end(); ++it) {
		const ModSpec &mod = *it;
		if (!string_allowed(mod.name, MODNAME_ALLOWED_CHARS)) {
			throw ModError("Error loading mod \"" + mod.name +
				"\": Mod name does not follow naming conventions: "
				"Only characters [a-z0-9_] are allowed.");
		}
		std::string script_path = mod.path + DIR_DELIM + "init.lua";
		infostream << "  [" << padStringRight(mod.name, 12) << "] [\""
				<< script_path << "\"]" << std::endl;
		m_script->loadMod(script_path, mod.name);
	}

	// Read Textures and calculate sha1 sums
	fillMediaCache();

	// Apply item aliases in the node definition manager
	m_nodedef->updateAliases(m_itemdef);

	// Apply texture overrides from texturepack/override.txt
	std::string texture_path = g_settings->get("texture_path");
	if (texture_path != "" && fs::IsDir(texture_path))
		m_nodedef->applyTextureOverrides(texture_path + DIR_DELIM + "override.txt");

	m_nodedef->setNodeRegistrationStatus(true);

	// Perform pending node name resolutions
	m_nodedef->runNodeResolveCallbacks();

	// unmap node names for connected nodeboxes
	m_nodedef->mapNodeboxConnections();

	// init the recipe hashes to speed up crafting
	m_craftdef->initHashes(this);

	// Initialize Environment
	m_env = new ServerEnvironment(servermap, m_script, this, m_path_world);

	m_clients.setEnv(m_env);

	if (!servermap->settings_mgr.makeMapgenParams())
		FATAL_ERROR("Couldn't create any mapgen type");

	// Initialize mapgens
	m_emerge->initMapgens(servermap->getMapgenParams());

	m_enable_rollback_recording = g_settings->getBool("enable_rollback_recording");
	if (m_enable_rollback_recording) {
		// Create rollback manager
		m_rollback = new RollbackManager(m_path_world, this);
	}

	// Give environment reference to scripting api
	m_script->initializeEnvironment(m_env);

	// Register us to receive map edit events
	servermap->addEventReceiver(this);

	// If file exists, load environment metadata
	if (fs::PathExists(m_path_world + DIR_DELIM "env_meta.txt")) {
		infostream << "Server: Loading environment metadata" << std::endl;
		m_env->loadMeta();
	} else {
		m_env->loadDefaultMeta();
	}

	m_liquid_transform_every = g_settings->getFloat("liquid_update");
	m_max_chatmessage_length = g_settings->getU16("chat_message_max_size");
	m_csm_flavour_limits = g_settings->getU64("csm_flavour_limits");
	m_csm_noderange_limit = g_settings->getU32("csm_flavour_noderange_limit");
}

Server::~Server()
{
	infostream<<"Server destructing"<<std::endl;

	// Send shutdown message
	SendChatMessage(PEER_ID_INEXISTENT, ChatMessage(CHATMESSAGE_TYPE_ANNOUNCE,
			L"*** Server shutting down"));

	{
		MutexAutoLock envlock(m_env_mutex);

		// Execute script shutdown hooks
		m_script->on_shutdown();

		infostream << "Server: Saving players" << std::endl;
		m_env->saveLoadedPlayers();

		infostream << "Server: Kicking players" << std::endl;
		std::string kick_msg;
		bool reconnect = false;
		if (getShutdownRequested()) {
			reconnect = m_shutdown_ask_reconnect;
			kick_msg = m_shutdown_msg;
		}
		if (kick_msg == "") {
			kick_msg = g_settings->get("kick_msg_shutdown");
		}
		m_env->kickAllPlayers(SERVER_ACCESSDENIED_SHUTDOWN,
			kick_msg, reconnect);

		infostream << "Server: Saving environment metadata" << std::endl;
		m_env->saveMeta();
	}

	// Stop threads
	stop();
	delete m_thread;

	// stop all emerge threads before deleting players that may have
	// requested blocks to be emerged
	m_emerge->stopThreads();

	// Delete things in the reverse order of creation
	delete m_emerge;
	delete m_env;
	delete m_rollback;
	delete m_banmanager;
	delete m_event;
	delete m_itemdef;
	delete m_nodedef;
	delete m_craftdef;

	// Deinitialize scripting
	infostream<<"Server: Deinitializing scripting"<<std::endl;
	delete m_script;

	// Delete detached inventories
	for (std::map<std::string, Inventory*>::iterator
			i = m_detached_inventories.begin();
			i != m_detached_inventories.end(); ++i) {
		delete i->second;
	}
}

void Server::start(Address bind_addr)
{
	DSTACK(FUNCTION_NAME);

	m_bind_addr = bind_addr;

	infostream<<"Starting server on "
			<< bind_addr.serializeString() <<"..."<<std::endl;

	// Stop thread if already running
	m_thread->stop();

	// Initialize connection
	m_con.SetTimeoutMs(30);
	m_con.Serve(bind_addr);

	// Start thread
	m_thread->start();

	// ASCII art for the win!
	actionstream
	<<"        .__               __                   __   "<<std::endl
	<<"  _____ |__| ____   _____/  |_  ____   _______/  |_ "<<std::endl
	<<" /     \\|  |/    \\_/ __ \\   __\\/ __ \\ /  ___/\\   __\\"<<std::endl
	<<"|  Y Y  \\  |   |  \\  ___/|  | \\  ___/ \\___ \\  |  |  "<<std::endl
	<<"|__|_|  /__|___|  /\\___  >__|  \\___  >____  > |__|  "<<std::endl
	<<"      \\/        \\/     \\/          \\/     \\/        "<<std::endl;
	actionstream<<"World at ["<<m_path_world<<"]"<<std::endl;
	actionstream<<"Server for gameid=\""<<m_gamespec.id
			<<"\" listening on "<<bind_addr.serializeString()<<":"
			<<bind_addr.getPort() << "."<<std::endl;
}

void Server::stop()
{
	DSTACK(FUNCTION_NAME);

	infostream<<"Server: Stopping and waiting threads"<<std::endl;

	// Stop threads (set run=false first so both start stopping)
	m_thread->stop();
	//m_emergethread.setRun(false);
	m_thread->wait();
	//m_emergethread.stop();

	infostream<<"Server: Threads stopped"<<std::endl;
}

void Server::step(float dtime)
{
	DSTACK(FUNCTION_NAME);
	// Limit a bit
	if (dtime > 2.0)
		dtime = 2.0;
	{
		MutexAutoLock lock(m_step_dtime_mutex);
		m_step_dtime += dtime;
	}
	// Throw if fatal error occurred in thread
	std::string async_err = m_async_fatal_error.get();
	if (!async_err.empty()) {
		if (!m_simple_singleplayer_mode) {
			m_env->kickAllPlayers(SERVER_ACCESSDENIED_CRASH,
				g_settings->get("kick_msg_crash"),
				g_settings->getBool("ask_reconnect_on_crash"));
		}
		throw ServerError("AsyncErr: " + async_err);
	}
}

void Server::AsyncRunStep(bool initial_step)
{
	DSTACK(FUNCTION_NAME);

	g_profiler->add("Server::AsyncRunStep (num)", 1);

	float dtime;
	{
		MutexAutoLock lock1(m_step_dtime_mutex);
		dtime = m_step_dtime;
	}

	{
		// Send blocks to clients
		SendBlocks(dtime);
	}

	if((dtime < 0.001) && (initial_step == false))
		return;

	g_profiler->add("Server::AsyncRunStep with dtime (num)", 1);

	//infostream<<"Server steps "<<dtime<<std::endl;
	//infostream<<"Server::AsyncRunStep(): dtime="<<dtime<<std::endl;

	{
		MutexAutoLock lock1(m_step_dtime_mutex);
		m_step_dtime -= dtime;
	}

	/*
		Update uptime
	*/
	{
		m_uptime.set(m_uptime.get() + dtime);
	}

	handlePeerChanges();

	/*
		Update time of day and overall game time
	*/
	m_env->setTimeOfDaySpeed(g_settings->getFloat("time_speed"));

	/*
		Send to clients at constant intervals
	*/

	m_time_of_day_send_timer -= dtime;
	if(m_time_of_day_send_timer < 0.0) {
		m_time_of_day_send_timer = g_settings->getFloat("time_send_interval");
		u16 time = m_env->getTimeOfDay();
		float time_speed = g_settings->getFloat("time_speed");
		SendTimeOfDay(PEER_ID_INEXISTENT, time, time_speed);
	}

	{
		MutexAutoLock lock(m_env_mutex);
		// Figure out and report maximum lag to environment
		float max_lag = m_env->getMaxLagEstimate();
		max_lag *= 0.9998; // Decrease slowly (about half per 5 minutes)
		if(dtime > max_lag){
			if(dtime > 0.1 && dtime > max_lag * 2.0)
				infostream<<"Server: Maximum lag peaked to "<<dtime
						<<" s"<<std::endl;
			max_lag = dtime;
		}
		m_env->reportMaxLagEstimate(max_lag);
		// Step environment
		ScopeProfiler sp(g_profiler, "SEnv step");
		ScopeProfiler sp2(g_profiler, "SEnv step avg", SPT_AVG);
		m_env->step(dtime);
	}

	static const float map_timer_and_unload_dtime = 2.92;
	if(m_map_timer_and_unload_interval.step(dtime, map_timer_and_unload_dtime))
	{
		MutexAutoLock lock(m_env_mutex);
		// Run Map's timers and unload unused data
		ScopeProfiler sp(g_profiler, "Server: map timer and unload");
		m_env->getMap().timerUpdate(map_timer_and_unload_dtime,
			g_settings->getFloat("server_unload_unused_data_timeout"),
			U32_MAX);
	}

	/*
		Listen to the admin chat, if available
	*/
	if (m_admin_chat) {
		if (!m_admin_chat->command_queue.empty()) {
			MutexAutoLock lock(m_env_mutex);
			while (!m_admin_chat->command_queue.empty()) {
				ChatEvent *evt = m_admin_chat->command_queue.pop_frontNoEx();
				handleChatInterfaceEvent(evt);
				delete evt;
			}
		}
		m_admin_chat->outgoing_queue.push_back(
			new ChatEventTimeInfo(m_env->getGameTime(), m_env->getTimeOfDay()));
	}

	/*
		Do background stuff
	*/

	/* Transform liquids */
	m_liquid_transform_timer += dtime;
	if(m_liquid_transform_timer >= m_liquid_transform_every)
	{
		m_liquid_transform_timer -= m_liquid_transform_every;

		MutexAutoLock lock(m_env_mutex);

		ScopeProfiler sp(g_profiler, "Server: liquid transform");

		std::map<v3s16, MapBlock*> modified_blocks;
		m_env->getMap().transformLiquids(modified_blocks, m_env);
#if 0
		/*
			Update lighting
		*/
		core::map<v3s16, MapBlock*> lighting_modified_blocks;
		ServerMap &map = ((ServerMap&)m_env->getMap());
		map.updateLighting(modified_blocks, lighting_modified_blocks);

		// Add blocks modified by lighting to modified_blocks
		for(core::map<v3s16, MapBlock*>::Iterator
				i = lighting_modified_blocks.getIterator();
				i.atEnd() == false; i++)
		{
			MapBlock *block = i.getNode()->getValue();
			modified_blocks.insert(block->getPos(), block);
		}
#endif
		/*
			Set the modified blocks unsent for all the clients
		*/
		if(!modified_blocks.empty())
		{
			SetBlocksNotSent(modified_blocks);
		}
	}
	m_clients.step(dtime);

	m_lag += (m_lag > dtime ? -1 : 1) * dtime/100;
#if USE_CURL
	// send masterserver announce
	{
		float &counter = m_masterserver_timer;
		if (!isSingleplayer() && (!counter || counter >= 300.0) &&
				g_settings->getBool("server_announce")) {
			ServerList::sendAnnounce(counter ? ServerList::AA_UPDATE :
						ServerList::AA_START,
					m_bind_addr.getPort(),
					m_clients.getPlayerNames(),
					m_uptime.get(),
					m_env->getGameTime(),
					m_lag,
					m_gamespec.id,
					Mapgen::getMapgenName(m_emerge->mgparams->mgtype),
					m_mods,
					m_dedicated);
			counter = 0.01;
		}
		counter += dtime;
	}
#endif

	/*
		Check added and deleted active objects
	*/
	{
		//infostream<<"Server: Checking added and deleted active objects"<<std::endl;
		MutexAutoLock envlock(m_env_mutex);

		m_clients.lock();
		RemoteClientMap clients = m_clients.getClientList();
		ScopeProfiler sp(g_profiler, "Server: checking added and deleted objs");

		// Radius inside which objects are active
		static thread_local const s16 radius =
			g_settings->getS16("active_object_send_range_blocks") * MAP_BLOCKSIZE;

		// Radius inside which players are active
		static thread_local const bool is_transfer_limited =
			g_settings->exists("unlimited_player_transfer_distance") &&
			!g_settings->getBool("unlimited_player_transfer_distance");
		static thread_local const s16 player_transfer_dist =
			g_settings->getS16("player_transfer_distance") * MAP_BLOCKSIZE;
		s16 player_radius = player_transfer_dist;
		if (player_radius == 0 && is_transfer_limited)
			player_radius = radius;

		for (RemoteClientMap::iterator i = clients.begin();
			i != clients.end(); ++i) {
			RemoteClient *client = i->second;

			// If definitions and textures have not been sent, don't
			// send objects either
			if (client->getState() < CS_DefinitionsSent)
				continue;

			RemotePlayer *player = m_env->getPlayer(client->peer_id);
			if (player == NULL) {
				// This can happen if the client timeouts somehow
				/*warningstream<<FUNCTION_NAME<<": Client "
						<<client->peer_id
						<<" has no associated player"<<std::endl;*/
				continue;
			}

			PlayerSAO *playersao = player->getPlayerSAO();
			if (playersao == NULL)
				continue;

			s16 my_radius = MYMIN(radius, playersao->getWantedRange() * MAP_BLOCKSIZE);
			if (my_radius <= 0) my_radius = radius;
			//infostream << "Server: Active Radius " << my_radius << std::endl;

			std::queue<u16> removed_objects;
			std::queue<u16> added_objects;
			m_env->getRemovedActiveObjects(playersao, my_radius, player_radius,
					client->m_known_objects, removed_objects);
			m_env->getAddedActiveObjects(playersao, my_radius, player_radius,
					client->m_known_objects, added_objects);

			// Ignore if nothing happened
			if (removed_objects.empty() && added_objects.empty()) {
				continue;
			}

			std::string data_buffer;

			char buf[4];

			// Handle removed objects
			writeU16((u8*)buf, removed_objects.size());
			data_buffer.append(buf, 2);
			while (!removed_objects.empty()) {
				// Get object
				u16 id = removed_objects.front();
				ServerActiveObject* obj = m_env->getActiveObject(id);

				// Add to data buffer for sending
				writeU16((u8*)buf, id);
				data_buffer.append(buf, 2);

				// Remove from known objects
				client->m_known_objects.erase(id);

				if(obj && obj->m_known_by_count > 0)
					obj->m_known_by_count--;
				removed_objects.pop();
			}

			// Handle added objects
			writeU16((u8*)buf, added_objects.size());
			data_buffer.append(buf, 2);
			while (!added_objects.empty()) {
				// Get object
				u16 id = added_objects.front();
				ServerActiveObject* obj = m_env->getActiveObject(id);

				// Get object type
				u8 type = ACTIVEOBJECT_TYPE_INVALID;
				if(obj == NULL)
					warningstream<<FUNCTION_NAME
							<<": NULL object"<<std::endl;
				else
					type = obj->getSendType();

				// Add to data buffer for sending
				writeU16((u8*)buf, id);
				data_buffer.append(buf, 2);
				writeU8((u8*)buf, type);
				data_buffer.append(buf, 1);

				if(obj)
					data_buffer.append(serializeLongString(
							obj->getClientInitializationData(client->net_proto_version)));
				else
					data_buffer.append(serializeLongString(""));

				// Add to known objects
				client->m_known_objects.insert(id);

				if(obj)
					obj->m_known_by_count++;

				added_objects.pop();
			}

			u32 pktSize = SendActiveObjectRemoveAdd(client->peer_id, data_buffer);
			verbosestream << "Server: Sent object remove/add: "
					<< removed_objects.size() << " removed, "
					<< added_objects.size() << " added, "
					<< "packet size is " << pktSize << std::endl;
		}
		m_clients.unlock();

		m_mod_storage_save_timer -= dtime;
		if (m_mod_storage_save_timer <= 0.0f) {
			infostream << "Saving registered mod storages." << std::endl;
			m_mod_storage_save_timer = g_settings->getFloat("server_map_save_interval");
			for (std::unordered_map<std::string, ModMetadata *>::const_iterator
				it = m_mod_storages.begin(); it != m_mod_storages.end(); ++it) {
				if (it->second->isModified()) {
					it->second->save(getModStoragePath());
				}
			}
		}
	}

	/*
		Send object messages
	*/
	{
		MutexAutoLock envlock(m_env_mutex);
		ScopeProfiler sp(g_profiler, "Server: sending object messages");

		// Key = object id
		// Value = data sent by object
		std::unordered_map<u16, std::vector<ActiveObjectMessage>*> buffered_messages;

		// Get active object messages from environment
		for(;;) {
			ActiveObjectMessage aom = m_env->getActiveObjectMessage();
			if (aom.id == 0)
				break;

			std::vector<ActiveObjectMessage>* message_list = NULL;
			std::unordered_map<u16, std::vector<ActiveObjectMessage>* >::iterator n;
			n = buffered_messages.find(aom.id);
			if (n == buffered_messages.end()) {
				message_list = new std::vector<ActiveObjectMessage>;
				buffered_messages[aom.id] = message_list;
			}
			else {
				message_list = n->second;
			}
			message_list->push_back(aom);
		}

		m_clients.lock();
		RemoteClientMap clients = m_clients.getClientList();
		// Route data to every client
		for (std::unordered_map<u16, RemoteClient*>::iterator i = clients.begin();
				i != clients.end(); ++i) {
			RemoteClient *client = i->second;
			std::string reliable_data;
			std::string unreliable_data;
			// Go through all objects in message buffer
			for (std::unordered_map<u16, std::vector<ActiveObjectMessage>* >::iterator
					j = buffered_messages.begin();
					j != buffered_messages.end(); ++j) {
				// If object is not known by client, skip it
				u16 id = j->first;
				if (client->m_known_objects.find(id) == client->m_known_objects.end())
					continue;

				// Get message list of object
				std::vector<ActiveObjectMessage>* list = j->second;
				// Go through every message
				for (std::vector<ActiveObjectMessage>::iterator
						k = list->begin(); k != list->end(); ++k) {
					// Compose the full new data with header
					ActiveObjectMessage aom = *k;
					std::string new_data;
					// Add object id
					char buf[2];
					writeU16((u8*)&buf[0], aom.id);
					new_data.append(buf, 2);
					// Add data
					new_data += serializeString(aom.datastring);
					// Add data to buffer
					if(aom.reliable)
						reliable_data += new_data;
					else
						unreliable_data += new_data;
				}
			}
			/*
				reliable_data and unreliable_data are now ready.
				Send them.
			*/
			if(reliable_data.size() > 0) {
				SendActiveObjectMessages(client->peer_id, reliable_data);
			}

			if(unreliable_data.size() > 0) {
				SendActiveObjectMessages(client->peer_id, unreliable_data, false);
			}
		}
		m_clients.unlock();

		// Clear buffered_messages
		for (std::unordered_map<u16, std::vector<ActiveObjectMessage>* >::iterator
				i = buffered_messages.begin();
				i != buffered_messages.end(); ++i) {
			delete i->second;
		}
	}

	/*
		Send queued-for-sending map edit events.
	*/
	{
		// We will be accessing the environment
		MutexAutoLock lock(m_env_mutex);

		// Don't send too many at a time
		//u32 count = 0;

		// Single change sending is disabled if queue size is not small
		bool disable_single_change_sending = false;
		if(m_unsent_map_edit_queue.size() >= 4)
			disable_single_change_sending = true;

		int event_count = m_unsent_map_edit_queue.size();

		// We'll log the amount of each
		Profiler prof;

		while(m_unsent_map_edit_queue.size() != 0)
		{
			MapEditEvent* event = m_unsent_map_edit_queue.front();
			m_unsent_map_edit_queue.pop();

			// Players far away from the change are stored here.
			// Instead of sending the changes, MapBlocks are set not sent
			// for them.
			std::vector<u16> far_players;

			switch (event->type) {
			case MEET_ADDNODE:
			case MEET_SWAPNODE:
				prof.add("MEET_ADDNODE", 1);
				sendAddNode(event->p, event->n, event->already_known_by_peer,
						&far_players, disable_single_change_sending ? 5 : 30,
						event->type == MEET_ADDNODE);
				break;
			case MEET_REMOVENODE:
				prof.add("MEET_REMOVENODE", 1);
				sendRemoveNode(event->p, event->already_known_by_peer,
						&far_players, disable_single_change_sending ? 5 : 30);
				break;
			case MEET_BLOCK_NODE_METADATA_CHANGED:
				infostream << "Server: MEET_BLOCK_NODE_METADATA_CHANGED" << std::endl;
						prof.add("MEET_BLOCK_NODE_METADATA_CHANGED", 1);
						setBlockNotSent(event->p);
				break;
			case MEET_OTHER:
				infostream << "Server: MEET_OTHER" << std::endl;
				prof.add("MEET_OTHER", 1);
				for(std::set<v3s16>::iterator
						i = event->modified_blocks.begin();
						i != event->modified_blocks.end(); ++i) {
					setBlockNotSent(*i);
				}
				break;
			default:
				prof.add("unknown", 1);
				warningstream << "Server: Unknown MapEditEvent "
						<< ((u32)event->type) << std::endl;
				break;
			}

			/*
				Set blocks not sent to far players
			*/
			if(!far_players.empty()) {
				// Convert list format to that wanted by SetBlocksNotSent
				std::map<v3s16, MapBlock*> modified_blocks2;
				for(std::set<v3s16>::iterator
						i = event->modified_blocks.begin();
						i != event->modified_blocks.end(); ++i) {
					modified_blocks2[*i] =
							m_env->getMap().getBlockNoCreateNoEx(*i);
				}

				// Set blocks not sent
				for(std::vector<u16>::iterator
						i = far_players.begin();
						i != far_players.end(); ++i) {
					if(RemoteClient *client = getClient(*i))
						client->SetBlocksNotSent(modified_blocks2);
				}
			}

			delete event;

			/*// Don't send too many at a time
			count++;
			if(count >= 1 && m_unsent_map_edit_queue.size() < 100)
				break;*/
		}

		if(event_count >= 5){
			infostream<<"Server: MapEditEvents:"<<std::endl;
			prof.print(infostream);
		} else if(event_count != 0){
			verbosestream<<"Server: MapEditEvents:"<<std::endl;
			prof.print(verbosestream);
		}

	}

	/*
		Trigger emergethread (it somehow gets to a non-triggered but
		bysy state sometimes)
	*/
	{
		float &counter = m_emergethread_trigger_timer;
		counter += dtime;
		if (counter >= 2.0) {
			counter = 0.0;

			m_emerge->startThreads();
		}
	}

	// Save map, players and auth stuff
	{
		float &counter = m_savemap_timer;
		counter += dtime;
		static thread_local const float save_interval =
			g_settings->getFloat("server_map_save_interval");
		if (counter >= save_interval) {
			counter = 0.0;
			MutexAutoLock lock(m_env_mutex);

			ScopeProfiler sp(g_profiler, "Server: saving stuff");

			// Save ban file
			if (m_banmanager->isModified()) {
				m_banmanager->save();
			}

			// Save changed parts of map
			m_env->getMap().save(MOD_STATE_WRITE_NEEDED);

			// Save players
			m_env->saveLoadedPlayers();

			// Save environment metadata
			m_env->saveMeta();
		}
	}

	// Timed shutdown
	static const float shutdown_msg_times[] =
	{
		1, 2, 3, 4, 5, 10, 15, 20, 25, 30, 45, 60, 120, 180, 300, 600, 1200, 1800, 3600
	};

	if (m_shutdown_timer > 0.0f) {
		// Automated messages
		if (m_shutdown_timer < shutdown_msg_times[ARRLEN(shutdown_msg_times) - 1]) {
			for (u16 i = 0; i < ARRLEN(shutdown_msg_times) - 1; i++) {
				// If shutdown timer matches an automessage, shot it
				if (m_shutdown_timer > shutdown_msg_times[i] &&
					m_shutdown_timer - dtime < shutdown_msg_times[i]) {
					std::wstringstream ws;

					ws << L"*** Server shutting down in "
						<< duration_to_string(myround(m_shutdown_timer - dtime)).c_str()
						<< ".";

					infostream << wide_to_utf8(ws.str()).c_str() << std::endl;
					SendChatMessage(PEER_ID_INEXISTENT, ws.str());
					break;
				}
			}
		}

		m_shutdown_timer -= dtime;
		if (m_shutdown_timer < 0.0f) {
			m_shutdown_timer = 0.0f;
			m_shutdown_requested = true;
		}
	}
}

void Server::Receive()
{
	DSTACK(FUNCTION_NAME);
	SharedBuffer<u8> data;
	u16 peer_id;
	try {
		NetworkPacket pkt;
		m_con.Receive(&pkt);
		peer_id = pkt.getPeerId();
		ProcessData(&pkt);
	}
	catch(con::InvalidIncomingDataException &e) {
		infostream<<"Server::Receive(): "
				"InvalidIncomingDataException: what()="
				<<e.what()<<std::endl;
	}
	catch(SerializationError &e) {
		infostream<<"Server::Receive(): "
				"SerializationError: what()="
				<<e.what()<<std::endl;
	}
	catch(ClientStateError &e) {
		errorstream << "ProcessData: peer=" << peer_id  << e.what() << std::endl;
		DenyAccess_Legacy(peer_id, L"Your client sent something server didn't expect."
				L"Try reconnecting or updating your client");
	}
	catch(con::PeerNotFoundException &e) {
		// Do nothing
	}
}

PlayerSAO* Server::StageTwoClientInit(u16 peer_id)
{
	std::string playername = "";
	PlayerSAO *playersao = NULL;
	m_clients.lock();
	try {
		RemoteClient* client = m_clients.lockedGetClientNoEx(peer_id, CS_InitDone);
		if (client != NULL) {
			playername = client->getName();
			playersao = emergePlayer(playername.c_str(), peer_id, client->net_proto_version);
		}
	} catch (std::exception &e) {
		m_clients.unlock();
		throw;
	}
	m_clients.unlock();

	RemotePlayer *player = m_env->getPlayer(playername.c_str());

	// If failed, cancel
	if ((playersao == NULL) || (player == NULL)) {
		if (player && player->peer_id != 0) {
			actionstream << "Server: Failed to emerge player \"" << playername
					<< "\" (player allocated to an another client)" << std::endl;
			DenyAccess_Legacy(peer_id, L"Another client is connected with this "
					L"name. If your client closed unexpectedly, try again in "
					L"a minute.");
		} else {
			errorstream << "Server: " << playername << ": Failed to emerge player"
					<< std::endl;
			DenyAccess_Legacy(peer_id, L"Could not allocate player.");
		}
		return NULL;
	}

	/*
		Send complete position information
	*/
	SendMovePlayer(peer_id);

	// Send privileges
	SendPlayerPrivileges(peer_id);

	// Send inventory formspec
	SendPlayerInventoryFormspec(peer_id);

	// Send inventory
	SendInventory(playersao);

	// Send HP or death screen
	if (playersao->isDead())
		SendDeathscreen(peer_id, false, v3f(0,0,0));
	else
		SendPlayerHPOrDie(playersao);

	// Send Breath
	SendPlayerBreath(playersao);

	// Note things in chat if not in simple singleplayer mode
	if (!m_simple_singleplayer_mode && g_settings->getBool("show_statusline_on_connect")) {
		// Send information about server to player in chat
		SendChatMessage(peer_id, ChatMessage(CHATMESSAGE_TYPE_SYSTEM, getStatusString()));
	}
	Address addr = getPeerAddress(player->peer_id);
	std::string ip_str = addr.serializeString();
	actionstream<<player->getName() <<" [" << ip_str << "] joins game. " << std::endl;
	/*
		Print out action
	*/
	{
		const std::vector<std::string> &names = m_clients.getPlayerNames();

		actionstream << player->getName() << " joins game. List of players: ";

		for (std::vector<std::string>::const_iterator i = names.begin();
				i != names.end(); ++i) {
			actionstream << *i << " ";
		}

		actionstream << player->getName() <<std::endl;
	}
	return playersao;
}

inline void Server::handleCommand(NetworkPacket* pkt)
{
	const ToServerCommandHandler& opHandle = toServerCommandTable[pkt->getCommand()];
	(this->*opHandle.handler)(pkt);
}

void Server::ProcessData(NetworkPacket *pkt)
{
	DSTACK(FUNCTION_NAME);
	// Environment is locked first.
	MutexAutoLock envlock(m_env_mutex);

	ScopeProfiler sp(g_profiler, "Server::ProcessData");
	u32 peer_id = pkt->getPeerId();

	try {
		Address address = getPeerAddress(peer_id);
		std::string addr_s = address.serializeString();

		if(m_banmanager->isIpBanned(addr_s)) {
			std::string ban_name = m_banmanager->getBanName(addr_s);
			infostream << "Server: A banned client tried to connect from "
					<< addr_s << "; banned name was "
					<< ban_name << std::endl;
			// This actually doesn't seem to transfer to the client
			DenyAccess_Legacy(peer_id, L"Your ip is banned. Banned name was "
					+ utf8_to_wide(ban_name));
			return;
		}
	}
	catch(con::PeerNotFoundException &e) {
		/*
		 * no peer for this packet found
		 * most common reason is peer timeout, e.g. peer didn't
		 * respond for some time, your server was overloaded or
		 * things like that.
		 */
		infostream << "Server::ProcessData(): Canceling: peer "
				<< peer_id << " not found" << std::endl;
		return;
	}

	try {
		ToServerCommand command = (ToServerCommand) pkt->getCommand();

		// Command must be handled into ToServerCommandHandler
		if (command >= TOSERVER_NUM_MSG_TYPES) {
			infostream << "Server: Ignoring unknown command "
					 << command << std::endl;
			return;
		}

		if (toServerCommandTable[command].state == TOSERVER_STATE_NOT_CONNECTED) {
			handleCommand(pkt);
			return;
		}

		u8 peer_ser_ver = getClient(peer_id, CS_InitDone)->serialization_version;

		if(peer_ser_ver == SER_FMT_VER_INVALID) {
			errorstream << "Server::ProcessData(): Cancelling: Peer"
					" serialization format invalid or not initialized."
					" Skipping incoming command=" << command << std::endl;
			return;
		}

		/* Handle commands related to client startup */
		if (toServerCommandTable[command].state == TOSERVER_STATE_STARTUP) {
			handleCommand(pkt);
			return;
		}

		if (m_clients.getClientState(peer_id) < CS_Active) {
			if (command == TOSERVER_PLAYERPOS) return;

			errorstream << "Got packet command: " << command << " for peer id "
					<< peer_id << " but client isn't active yet. Dropping packet "
					<< std::endl;
			return;
		}

		handleCommand(pkt);
	} catch (SendFailedException &e) {
		errorstream << "Server::ProcessData(): SendFailedException: "
				<< "what=" << e.what()
				<< std::endl;
	} catch (PacketError &e) {
		actionstream << "Server::ProcessData(): PacketError: "
				<< "what=" << e.what()
				<< std::endl;
	}
}

void Server::setTimeOfDay(u32 time)
{
	m_env->setTimeOfDay(time);
	m_time_of_day_send_timer = 0;
}

void Server::onMapEditEvent(MapEditEvent *event)
{
	if(m_ignore_map_edit_events)
		return;
	if(m_ignore_map_edit_events_area.contains(event->getArea()))
		return;
	MapEditEvent *e = event->clone();
	m_unsent_map_edit_queue.push(e);
}

Inventory* Server::getInventory(const InventoryLocation &loc)
{
	switch (loc.type) {
	case InventoryLocation::UNDEFINED:
	case InventoryLocation::CURRENT_PLAYER:
		break;
	case InventoryLocation::PLAYER:
	{
		RemotePlayer *player = dynamic_cast<RemotePlayer *>(m_env->getPlayer(loc.name.c_str()));
		if(!player)
			return NULL;
		PlayerSAO *playersao = player->getPlayerSAO();
		if(!playersao)
			return NULL;
		return playersao->getInventory();
	}
		break;
	case InventoryLocation::NODEMETA:
	{
		NodeMetadata *meta = m_env->getMap().getNodeMetadata(loc.p);
		if(!meta)
			return NULL;
		return meta->getInventory();
	}
		break;
	case InventoryLocation::DETACHED:
	{
		if(m_detached_inventories.count(loc.name) == 0)
			return NULL;
		return m_detached_inventories[loc.name];
	}
		break;
	default:
		sanity_check(false); // abort
		break;
	}
	return NULL;
}
void Server::setInventoryModified(const InventoryLocation &loc, bool playerSend)
{
	switch(loc.type){
	case InventoryLocation::UNDEFINED:
		break;
	case InventoryLocation::PLAYER:
	{
		if (!playerSend)
			return;

		RemotePlayer *player =
			dynamic_cast<RemotePlayer *>(m_env->getPlayer(loc.name.c_str()));

		if (!player)
			return;

		PlayerSAO *playersao = player->getPlayerSAO();
		if(!playersao)
			return;

		SendInventory(playersao);
	}
		break;
	case InventoryLocation::NODEMETA:
	{
		v3s16 blockpos = getNodeBlockPos(loc.p);

		MapBlock *block = m_env->getMap().getBlockNoCreateNoEx(blockpos);
		if(block)
			block->raiseModified(MOD_STATE_WRITE_NEEDED);

		setBlockNotSent(blockpos);
	}
		break;
	case InventoryLocation::DETACHED:
	{
		sendDetachedInventory(loc.name,PEER_ID_INEXISTENT);
	}
		break;
	default:
		sanity_check(false); // abort
		break;
	}
}

void Server::SetBlocksNotSent(std::map<v3s16, MapBlock *>& block)
{
	std::vector<u16> clients = m_clients.getClientIDs();
	m_clients.lock();
	// Set the modified blocks unsent for all the clients
	for (std::vector<u16>::iterator i = clients.begin();
		 i != clients.end(); ++i) {
			if (RemoteClient *client = m_clients.lockedGetClientNoEx(*i))
				client->SetBlocksNotSent(block);
	}
	m_clients.unlock();
}

void Server::peerAdded(con::Peer *peer)
{
	DSTACK(FUNCTION_NAME);
	verbosestream<<"Server::peerAdded(): peer->id="
			<<peer->id<<std::endl;

	con::PeerChange c;
	c.type = con::PEER_ADDED;
	c.peer_id = peer->id;
	c.timeout = false;
	m_peer_change_queue.push(c);
}

void Server::deletingPeer(con::Peer *peer, bool timeout)
{
	DSTACK(FUNCTION_NAME);
	verbosestream<<"Server::deletingPeer(): peer->id="
			<<peer->id<<", timeout="<<timeout<<std::endl;

	m_clients.event(peer->id, CSE_Disconnect);
	con::PeerChange c;
	c.type = con::PEER_REMOVED;
	c.peer_id = peer->id;
	c.timeout = timeout;
	m_peer_change_queue.push(c);
}

bool Server::getClientConInfo(u16 peer_id, con::rtt_stat_type type, float* retval)
{
	*retval = m_con.getPeerStat(peer_id,type);
	if (*retval == -1) return false;
	return true;
}

bool Server::getClientInfo(
		u16          peer_id,
		ClientState* state,
		u32*         uptime,
		u8*          ser_vers,
		u16*         prot_vers,
		u8*          major,
		u8*          minor,
		u8*          patch,
		std::string* vers_string
	)
{
	*state = m_clients.getClientState(peer_id);
	m_clients.lock();
	RemoteClient* client = m_clients.lockedGetClientNoEx(peer_id, CS_Invalid);

	if (client == NULL) {
		m_clients.unlock();
		return false;
	}

	*uptime = client->uptime();
	*ser_vers = client->serialization_version;
	*prot_vers = client->net_proto_version;

	*major = client->getMajor();
	*minor = client->getMinor();
	*patch = client->getPatch();
	*vers_string = client->getPatch();

	m_clients.unlock();

	return true;
}

void Server::handlePeerChanges()
{
	while(m_peer_change_queue.size() > 0)
	{
		con::PeerChange c = m_peer_change_queue.front();
		m_peer_change_queue.pop();

		verbosestream<<"Server: Handling peer change: "
				<<"id="<<c.peer_id<<", timeout="<<c.timeout
				<<std::endl;

		switch(c.type)
		{
		case con::PEER_ADDED:
			m_clients.CreateClient(c.peer_id);
			break;

		case con::PEER_REMOVED:
			DeleteClient(c.peer_id, c.timeout?CDR_TIMEOUT:CDR_LEAVE);
			break;

		default:
			FATAL_ERROR("Invalid peer change event received!");
			break;
		}
	}
}

void Server::printToConsoleOnly(const std::string &text)
{
	if (m_admin_chat) {
		m_admin_chat->outgoing_queue.push_back(
			new ChatEventChat("", utf8_to_wide(text)));
	} else {
		std::cout << text << std::endl;
	}
}

void Server::Send(NetworkPacket* pkt)
{
	m_clients.send(pkt->getPeerId(),
		clientCommandFactoryTable[pkt->getCommand()].channel,
		pkt,
		clientCommandFactoryTable[pkt->getCommand()].reliable);
}

void Server::SendMovement(u16 peer_id)
{
	DSTACK(FUNCTION_NAME);
	std::ostringstream os(std::ios_base::binary);

	NetworkPacket pkt(TOCLIENT_MOVEMENT, 12 * sizeof(float), peer_id);

	pkt << g_settings->getFloat("movement_acceleration_default");
	pkt << g_settings->getFloat("movement_acceleration_air");
	pkt << g_settings->getFloat("movement_acceleration_fast");
	pkt << g_settings->getFloat("movement_speed_walk");
	pkt << g_settings->getFloat("movement_speed_crouch");
	pkt << g_settings->getFloat("movement_speed_fast");
	pkt << g_settings->getFloat("movement_speed_climb");
	pkt << g_settings->getFloat("movement_speed_jump");
	pkt << g_settings->getFloat("movement_liquid_fluidity");
	pkt << g_settings->getFloat("movement_liquid_fluidity_smooth");
	pkt << g_settings->getFloat("movement_liquid_sink");
	pkt << g_settings->getFloat("movement_gravity");

	Send(&pkt);
}

void Server::SendPlayerHPOrDie(PlayerSAO *playersao)
{
	if (!g_settings->getBool("enable_damage"))
		return;

	u16 peer_id   = playersao->getPeerID();
	bool is_alive = playersao->getHP() > 0;

	if (is_alive)
		SendPlayerHP(peer_id);
	else
		DiePlayer(peer_id);
}

void Server::SendHP(u16 peer_id, u8 hp)
{
	DSTACK(FUNCTION_NAME);

	NetworkPacket pkt(TOCLIENT_HP, 1, peer_id);
	pkt << hp;
	Send(&pkt);
}

void Server::SendBreath(u16 peer_id, u16 breath)
{
	DSTACK(FUNCTION_NAME);

	NetworkPacket pkt(TOCLIENT_BREATH, 2, peer_id);
	pkt << (u16) breath;
	Send(&pkt);
}

void Server::SendAccessDenied(u16 peer_id, AccessDeniedCode reason,
		const std::string &custom_reason, bool reconnect)
{
	assert(reason < SERVER_ACCESSDENIED_MAX);

	NetworkPacket pkt(TOCLIENT_ACCESS_DENIED, 1, peer_id);
	pkt << (u8)reason;
	if (reason == SERVER_ACCESSDENIED_CUSTOM_STRING)
		pkt << custom_reason;
	else if (reason == SERVER_ACCESSDENIED_SHUTDOWN ||
			reason == SERVER_ACCESSDENIED_CRASH)
		pkt << custom_reason << (u8)reconnect;
	Send(&pkt);
}

void Server::SendAccessDenied_Legacy(u16 peer_id,const std::wstring &reason)
{
	DSTACK(FUNCTION_NAME);

	NetworkPacket pkt(TOCLIENT_ACCESS_DENIED_LEGACY, 0, peer_id);
	pkt << reason;
	Send(&pkt);
}

void Server::SendDeathscreen(u16 peer_id,bool set_camera_point_target,
		v3f camera_point_target)
{
	DSTACK(FUNCTION_NAME);

	NetworkPacket pkt(TOCLIENT_DEATHSCREEN, 1 + sizeof(v3f), peer_id);
	pkt << set_camera_point_target << camera_point_target;
	Send(&pkt);
}

void Server::SendItemDef(u16 peer_id,
		IItemDefManager *itemdef, u16 protocol_version)
{
	DSTACK(FUNCTION_NAME);

	NetworkPacket pkt(TOCLIENT_ITEMDEF, 0, peer_id);

	/*
		u16 command
		u32 length of the next item
		zlib-compressed serialized ItemDefManager
	*/
	std::ostringstream tmp_os(std::ios::binary);
	itemdef->serialize(tmp_os, protocol_version);
	std::ostringstream tmp_os2(std::ios::binary);
	compressZlib(tmp_os.str(), tmp_os2);
	pkt.putLongString(tmp_os2.str());

	// Make data buffer
	verbosestream << "Server: Sending item definitions to id(" << peer_id
			<< "): size=" << pkt.getSize() << std::endl;

	Send(&pkt);
}

void Server::SendNodeDef(u16 peer_id,
		INodeDefManager *nodedef, u16 protocol_version)
{
	DSTACK(FUNCTION_NAME);

	NetworkPacket pkt(TOCLIENT_NODEDEF, 0, peer_id);

	/*
		u16 command
		u32 length of the next item
		zlib-compressed serialized NodeDefManager
	*/
	std::ostringstream tmp_os(std::ios::binary);
	nodedef->serialize(tmp_os, protocol_version);
	std::ostringstream tmp_os2(std::ios::binary);
	compressZlib(tmp_os.str(), tmp_os2);

	pkt.putLongString(tmp_os2.str());

	// Make data buffer
	verbosestream << "Server: Sending node definitions to id(" << peer_id
			<< "): size=" << pkt.getSize() << std::endl;

	Send(&pkt);
}

/*
	Non-static send methods
*/

void Server::SendInventory(PlayerSAO* playerSAO)
{
	DSTACK(FUNCTION_NAME);

	UpdateCrafting(playerSAO->getPlayer());

	/*
		Serialize it
	*/

	NetworkPacket pkt(TOCLIENT_INVENTORY, 0, playerSAO->getPeerID());

	std::ostringstream os;
	playerSAO->getInventory()->serialize(os);

	std::string s = os.str();

	pkt.putRawString(s.c_str(), s.size());
	Send(&pkt);
}

void Server::SendChatMessage(u16 peer_id, const ChatMessage &message)
{
	DSTACK(FUNCTION_NAME);

	NetworkPacket legacypkt(TOCLIENT_CHAT_MESSAGE_OLD, 0, peer_id);
	legacypkt << message.message;

	NetworkPacket pkt(TOCLIENT_CHAT_MESSAGE, 0, peer_id);
	u8 version = 1;
	u8 type = message.type;
	pkt << version << type << std::wstring(L"") << message.message << message.timestamp;

	if (peer_id != PEER_ID_INEXISTENT) {
		RemotePlayer *player = m_env->getPlayer(peer_id);
		if (!player)
			return;

		if (player->protocol_version < 35)
			Send(&legacypkt);
		else
			Send(&pkt);
	} else {
		m_clients.sendToAllCompat(&pkt, &legacypkt, 35);
	}
}

void Server::SendShowFormspecMessage(u16 peer_id, const std::string &formspec,
                                     const std::string &formname)
{
	DSTACK(FUNCTION_NAME);

	NetworkPacket pkt(TOCLIENT_SHOW_FORMSPEC, 0 , peer_id);
	if (formspec == "" ){
		//the client should close the formspec
		pkt.putLongString("");
	} else {
		pkt.putLongString(FORMSPEC_VERSION_STRING + formspec);
	}
	pkt << formname;

	Send(&pkt);
}

// Spawns a particle on peer with peer_id
void Server::SendSpawnParticle(u16 peer_id, u16 protocol_version,
				v3f pos, v3f velocity, v3f acceleration,
				float expirationtime, float size, bool collisiondetection,
				bool collision_removal,
				bool vertical, const std::string &texture,
				const struct TileAnimationParams &animation, u8 glow)
{
	DSTACK(FUNCTION_NAME);
	static thread_local const float radius =
			g_settings->getS16("max_block_send_distance") * MAP_BLOCKSIZE * BS;

	if (peer_id == PEER_ID_INEXISTENT) {
		std::vector<u16> clients = m_clients.getClientIDs();

		for (std::vector<u16>::iterator i = clients.begin(); i != clients.end(); ++i) {
			RemotePlayer *player = m_env->getPlayer(*i);
			if (!player)
				continue;

			PlayerSAO *sao = player->getPlayerSAO();
			if (!sao)
				continue;

			// Do not send to distant clients
			if (sao->getBasePosition().getDistanceFrom(pos * BS) > radius)
				continue;

			SendSpawnParticle(*i, player->protocol_version,
					pos, velocity, acceleration,
					expirationtime, size, collisiondetection,
					collision_removal, vertical, texture, animation, glow);
		}
		return;
	}

	NetworkPacket pkt(TOCLIENT_SPAWN_PARTICLE, 0, peer_id);

	pkt << pos << velocity << acceleration << expirationtime
			<< size << collisiondetection;
	pkt.putLongString(texture);
	pkt << vertical;
	pkt << collision_removal;
	// This is horrible but required (why are there two ways to serialize pkts?)
	std::ostringstream os(std::ios_base::binary);
	animation.serialize(os, protocol_version);
	pkt.putRawString(os.str());
	pkt << glow;

	Send(&pkt);
}

// Adds a ParticleSpawner on peer with peer_id
void Server::SendAddParticleSpawner(u16 peer_id, u16 protocol_version,
	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 collision_removal,
	u16 attached_id, bool vertical, const std::string &texture, u32 id,
	const struct TileAnimationParams &animation, u8 glow)
{
	DSTACK(FUNCTION_NAME);
	if (peer_id == PEER_ID_INEXISTENT) {
		// This sucks and should be replaced:
		std::vector<u16> clients = m_clients.getClientIDs();
		for (std::vector<u16>::iterator i = clients.begin(); i != clients.end(); ++i) {
			RemotePlayer *player = m_env->getPlayer(*i);
			if (!player)
				continue;
			SendAddParticleSpawner(*i, player->protocol_version,
					amount, spawntime, minpos, maxpos,
					minvel, maxvel, minacc, maxacc, minexptime, maxexptime,
					minsize, maxsize, collisiondetection, collision_removal,
					attached_id, vertical, texture, id, animation, glow);
		}
		return;
	}

	NetworkPacket pkt(TOCLIENT_ADD_PARTICLESPAWNER, 0, peer_id);

	pkt << amount << spawntime << minpos << maxpos << minvel << maxvel
			<< minacc << maxacc << minexptime << maxexptime << minsize
			<< maxsize << collisiondetection;

	pkt.putLongString(texture);

	pkt << id << vertical;
	pkt << collision_removal;
	pkt << attached_id;
	// This is horrible but required
	std::ostringstream os(std::ios_base::binary);
	animation.serialize(os, protocol_version);
	pkt.putRawString(os.str());
	pkt << glow;

	Send(&pkt);
}

void Server::SendDeleteParticleSpawner(u16 peer_id, u32 id)
{
	DSTACK(FUNCTION_NAME);

	NetworkPacket pkt(TOCLIENT_DELETE_PARTICLESPAWNER_LEGACY, 2, peer_id);

	// Ugly error in this packet
	pkt << (u16) id;

	if (peer_id != PEER_ID_INEXISTENT) {
		Send(&pkt);
	}
	else {
		m_clients.sendToAll(&pkt);
	}

}

void Server::SendHUDAdd(u16 peer_id, u32 id, HudElement *form)
{
	NetworkPacket pkt(TOCLIENT_HUDADD, 0 , peer_id);

	pkt << id << (u8) form->type << form->pos << form->name << form->scale
			<< form->text << form->number << form->item << form->dir
			<< form->align << form->offset << form->world_pos << form->size;

	Send(&pkt);
}

void Server::SendHUDRemove(u16 peer_id, u32 id)
{
	NetworkPacket pkt(TOCLIENT_HUDRM, 4, peer_id);
	pkt << id;
	Send(&pkt);
}

void Server::SendHUDChange(u16 peer_id, u32 id, HudElementStat stat, void *value)
{
	NetworkPacket pkt(TOCLIENT_HUDCHANGE, 0, peer_id);
	pkt << id << (u8) stat;

	switch (stat) {
		case HUD_STAT_POS:
		case HUD_STAT_SCALE:
		case HUD_STAT_ALIGN:
		case HUD_STAT_OFFSET:
			pkt << *(v2f *) value;
			break;
		case HUD_STAT_NAME:
		case HUD_STAT_TEXT:
			pkt << *(std::string *) value;
			break;
		case HUD_STAT_WORLD_POS:
			pkt << *(v3f *) value;
			break;
		case HUD_STAT_SIZE:
			pkt << *(v2s32 *) value;
			break;
		case HUD_STAT_NUMBER:
		case HUD_STAT_ITEM:
		case HUD_STAT_DIR:
		default:
			pkt << *(u32 *) value;
			break;
	}

	Send(&pkt);
}

void Server::SendHUDSetFlags(u16 peer_id, u32 flags, u32 mask)
{
	NetworkPacket pkt(TOCLIENT_HUD_SET_FLAGS, 4 + 4, peer_id);

	flags &= ~(HUD_FLAG_HEALTHBAR_VISIBLE | HUD_FLAG_BREATHBAR_VISIBLE);

	pkt << flags << mask;

	Send(&pkt);
}

void Server::SendHUDSetParam(u16 peer_id, u16 param, const std::string &value)
{
	NetworkPacket pkt(TOCLIENT_HUD_SET_PARAM, 0, peer_id);
	pkt << param << value;
	Send(&pkt);
}

void Server::SendSetSky(u16 peer_id, const video::SColor &bgcolor,
		const std::string &type, const std::vector<std::string> &params,
		bool &clouds)
{
	NetworkPacket pkt(TOCLIENT_SET_SKY, 0, peer_id);
	pkt << bgcolor << type << (u16) params.size();

	for(size_t i=0; i<params.size(); i++)
		pkt << params[i];

	pkt << clouds;

	Send(&pkt);
}

void Server::SendCloudParams(u16 peer_id, float density,
		const video::SColor &color_bright,
		const video::SColor &color_ambient,
		float height,
		float thickness,
		const v2f &speed)
{
	NetworkPacket pkt(TOCLIENT_CLOUD_PARAMS, 0, peer_id);
	pkt << density << color_bright << color_ambient
			<< height << thickness << speed;

	Send(&pkt);
}

void Server::SendOverrideDayNightRatio(u16 peer_id, bool do_override,
		float ratio)
{
	NetworkPacket pkt(TOCLIENT_OVERRIDE_DAY_NIGHT_RATIO,
			1 + 2, peer_id);

	pkt << do_override << (u16) (ratio * 65535);

	Send(&pkt);
}

void Server::SendTimeOfDay(u16 peer_id, u16 time, f32 time_speed)
{
	DSTACK(FUNCTION_NAME);

	NetworkPacket pkt(TOCLIENT_TIME_OF_DAY, 0, peer_id);
	pkt << time << time_speed;

	if (peer_id == PEER_ID_INEXISTENT) {
		m_clients.sendToAll(&pkt);
	}
	else {
		Send(&pkt);
	}
}

void Server::SendPlayerHP(u16 peer_id)
{
	DSTACK(FUNCTION_NAME);
	PlayerSAO *playersao = getPlayerSAO(peer_id);
	// In some rare case if the player is disconnected
	// while Lua call l_punch, for example, this can be NULL
	if (!playersao)
		return;

	SendHP(peer_id, playersao->getHP());
	m_script->player_event(playersao,"health_changed");

	// Send to other clients
	std::string str = gob_cmd_punched(playersao->readDamage(), playersao->getHP());
	ActiveObjectMessage aom(playersao->getId(), true, str);
	playersao->m_messages_out.push(aom);
}

void Server::SendPlayerBreath(PlayerSAO *sao)
{
	DSTACK(FUNCTION_NAME);
	assert(sao);

	m_script->player_event(sao, "breath_changed");
	SendBreath(sao->getPeerID(), sao->getBreath());
}

void Server::SendMovePlayer(u16 peer_id)
{
	DSTACK(FUNCTION_NAME);
	RemotePlayer *player = m_env->getPlayer(peer_id);
	assert(player);
	PlayerSAO *sao = player->getPlayerSAO();
	assert(sao);

	NetworkPacket pkt(TOCLIENT_MOVE_PLAYER, sizeof(v3f) + sizeof(f32) * 2, peer_id);
	pkt << sao->getBasePosition() << sao->getPitch() << sao->getYaw();

	{
		v3f pos = sao->getBasePosition();
		verbosestream << "Server: Sending TOCLIENT_MOVE_PLAYER"
				<< " pos=(" << pos.X << "," << pos.Y << "," << pos.Z << ")"
				<< " pitch=" << sao->getPitch()
				<< " yaw=" << sao->getYaw()
				<< std::endl;
	}

	Send(&pkt);
}

void Server::SendLocalPlayerAnimations(u16 peer_id, v2s32 animation_frames[4], f32 animation_speed)
{
	NetworkPacket pkt(TOCLIENT_LOCAL_PLAYER_ANIMATIONS, 0,
		peer_id);

	pkt << animation_frames[0] << animation_frames[1] << animation_frames[2]
			<< animation_frames[3] << animation_speed;

	Send(&pkt);
}

void Server::SendEyeOffset(u16 peer_id, v3f first, v3f third)
{
	NetworkPacket pkt(TOCLIENT_EYE_OFFSET, 0, peer_id);
	pkt << first << third;
	Send(&pkt);
}
void Server::SendPlayerPrivileges(u16 peer_id)
{
	RemotePlayer *player = m_env->getPlayer(peer_id);
	assert(player);
	if(player->peer_id == PEER_ID_INEXISTENT)
		return;

	std::set<std::string> privs;
	m_script->getAuth(player->getName(), NULL, &privs);

	NetworkPacket pkt(TOCLIENT_PRIVILEGES, 0, peer_id);
	pkt << (u16) privs.size();

	for(std::set<std::string>::const_iterator i = privs.begin();
			i != privs.end(); ++i) {
		pkt << (*i);
	}

	Send(&pkt);
}

void Server::SendPlayerInventoryFormspec(u16 peer_id)
{
	RemotePlayer *player = m_env->getPlayer(peer_id);
	assert(player);
	if(player->peer_id == PEER_ID_INEXISTENT)
		return;

	NetworkPacket pkt(TOCLIENT_INVENTORY_FORMSPEC, 0, peer_id);
	pkt.putLongString(FORMSPEC_VERSION_STRING + player->inventory_formspec);
	Send(&pkt);
}

u32 Server::SendActiveObjectRemoveAdd(u16 peer_id, const std::string &datas)
{
	NetworkPacket pkt(TOCLIENT_ACTIVE_OBJECT_REMOVE_ADD, datas.size(), peer_id);
	pkt.putRawString(datas.c_str(), datas.size());
	Send(&pkt);
	return pkt.getSize();
}

void Server::SendActiveObjectMessages(u16 peer_id, const std::string &datas, bool reliable)
{
	NetworkPacket pkt(TOCLIENT_ACTIVE_OBJECT_MESSAGES,
			datas.size(), peer_id);

	pkt.putRawString(datas.c_str(), datas.size());

	m_clients.send(pkt.getPeerId(),
			reliable ? clientCommandFactoryTable[pkt.getCommand()].channel : 1,
			&pkt, reliable);
}

void Server::SendCSMFlavourLimits(u16 peer_id)
{
	NetworkPacket pkt(TOCLIENT_CSM_FLAVOUR_LIMITS,
		sizeof(m_csm_flavour_limits) + sizeof(m_csm_noderange_limit), peer_id);
	pkt << m_csm_flavour_limits << m_csm_noderange_limit;
	Send(&pkt);
}

s32 Server::playSound(const SimpleSoundSpec &spec,
		const ServerSoundParams &params)
{
	// Find out initial position of sound
	bool pos_exists = false;
	v3f pos = params.getPos(m_env, &pos_exists);
	// If position is not found while it should be, cancel sound
	if(pos_exists != (params.type != ServerSoundParams::SSP_LOCAL))
		return -1;

	// Filter destination clients
	std::vector<u16> dst_clients;
	if(params.to_player != "")
	{
		RemotePlayer *player = m_env->getPlayer(params.to_player.c_str());
		if(!player){
			infostream<<"Server::playSound: Player \""<<params.to_player
					<<"\" not found"<<std::endl;
			return -1;
		}
		if(player->peer_id == PEER_ID_INEXISTENT){
			infostream<<"Server::playSound: Player \""<<params.to_player
					<<"\" not connected"<<std::endl;
			return -1;
		}
		dst_clients.push_back(player->peer_id);
	}
	else {
		std::vector<u16> clients = m_clients.getClientIDs();

		for (std::vector<u16>::iterator i = clients.begin(); i != clients.end(); ++i) {
			RemotePlayer *player = m_env->getPlayer(*i);
			if (!player)
				continue;

			PlayerSAO *sao = player->getPlayerSAO();
			if (!sao)
				continue;

			if (pos_exists) {
				if(sao->getBasePosition().getDistanceFrom(pos) >
						params.max_hear_distance)
					continue;
			}
			dst_clients.push_back(*i);
		}
	}

	if(dst_clients.empty())
		return -1;

	// Create the sound
	s32 id = m_next_sound_id++;
	// The sound will exist as a reference in m_playing_sounds
	m_playing_sounds[id] = ServerPlayingSound();
	ServerPlayingSound &psound = m_playing_sounds[id];
	psound.params = params;
	psound.spec = spec;

	float gain = params.gain * spec.gain;
	NetworkPacket pkt(TOCLIENT_PLAY_SOUND, 0);
	pkt << id << spec.name << gain
			<< (u8) params.type << pos << params.object
			<< params.loop << params.fade << params.pitch;

	// Backwards compability
	bool play_sound = gain > 0;

	for (std::vector<u16>::iterator i = dst_clients.begin();
			i != dst_clients.end(); ++i) {
		if (play_sound || m_clients.getProtocolVersion(*i) >= 32) {
			psound.clients.insert(*i);
			m_clients.send(*i, 0, &pkt, true);
		}
	}
	return id;
}
void Server::stopSound(s32 handle)
{
	// Get sound reference
	std::unordered_map<s32, ServerPlayingSound>::iterator i =
		m_playing_sounds.find(handle);
	if (i == m_playing_sounds.end())
		return;
	ServerPlayingSound &psound = i->second;

	NetworkPacket pkt(TOCLIENT_STOP_SOUND, 4);
	pkt << handle;

	for (std::unordered_set<u16>::const_iterator si = psound.clients.begin();
			si != psound.clients.end(); ++si) {
		// Send as reliable
		m_clients.send(*si, 0, &pkt, true);
	}
	// Remove sound reference
	m_playing_sounds.erase(i);
}

void Server::fadeSound(s32 handle, float step, float gain)
{
	// Get sound reference
	std::unordered_map<s32, ServerPlayingSound>::iterator i =
		m_playing_sounds.find(handle);
	if (i == m_playing_sounds.end())
		return;

	ServerPlayingSound &psound = i->second;
	psound.params.gain = gain;

	NetworkPacket pkt(TOCLIENT_FADE_SOUND, 4);
	pkt << handle << step << gain;

	// Backwards compability
	bool play_sound = gain > 0;
	ServerPlayingSound compat_psound = psound;
	compat_psound.clients.clear();

	NetworkPacket compat_pkt(TOCLIENT_STOP_SOUND, 4);
	compat_pkt << handle;

	for (std::unordered_set<u16>::iterator it = psound.clients.begin();
			it != psound.clients.end();) {
		if (m_clients.getProtocolVersion(*it) >= 32) {
			// Send as reliable
			m_clients.send(*it, 0, &pkt, true);
			++it;
		} else {
			compat_psound.clients.insert(*it);
			// Stop old sound
			m_clients.send(*it, 0, &compat_pkt, true);
			psound.clients.erase(it++);
		}
	}

	// Remove sound reference
	if (!play_sound || psound.clients.size() == 0)
		m_playing_sounds.erase(i);

	if (play_sound && compat_psound.clients.size() > 0) {
		// Play new sound volume on older clients
		playSound(compat_psound.spec, compat_psound.params);
	}
}

void Server::sendRemoveNode(v3s16 p, u16 ignore_id,
	std::vector<u16> *far_players, float far_d_nodes)
{
	float maxd = far_d_nodes*BS;
	v3f p_f = intToFloat(p, BS);

	NetworkPacket pkt(TOCLIENT_REMOVENODE, 6);
	pkt << p;

	std::vector<u16> clients = m_clients.getClientIDs();
	for (std::vector<u16>::iterator i = clients.begin(); i != clients.end(); ++i) {
		if (far_players) {
			// Get player
			if (RemotePlayer *player = m_env->getPlayer(*i)) {
				PlayerSAO *sao = player->getPlayerSAO();
				if (!sao)
					continue;

				// If player is far away, only set modified blocks not sent
				v3f player_pos = sao->getBasePosition();
				if (player_pos.getDistanceFrom(p_f) > maxd) {
					far_players->push_back(*i);
					continue;
				}
			}
		}

		// Send as reliable
		m_clients.send(*i, 0, &pkt, true);
	}
}

void Server::sendAddNode(v3s16 p, MapNode n, u16 ignore_id,
		std::vector<u16> *far_players, float far_d_nodes,
		bool remove_metadata)
{
	float maxd = far_d_nodes*BS;
	v3f p_f = intToFloat(p, BS);

	std::vector<u16> clients = m_clients.getClientIDs();
	for(std::vector<u16>::iterator i = clients.begin();	i != clients.end(); ++i) {
		if (far_players) {
			// Get player
			if (RemotePlayer *player = m_env->getPlayer(*i)) {
				PlayerSAO *sao = player->getPlayerSAO();
				if (!sao)
					continue;

				// If player is far away, only set modified blocks not sent
				v3f player_pos = sao->getBasePosition();
				if(player_pos.getDistanceFrom(p_f) > maxd) {
					far_players->push_back(*i);
					continue;
				}
			}
		}

		NetworkPacket pkt(TOCLIENT_ADDNODE, 6 + 2 + 1 + 1 + 1);
		m_clients.lock();
		RemoteClient* client = m_clients.lockedGetClientNoEx(*i);
		if (client != 0) {
			pkt << p << n.param0 << n.param1 << n.param2
					<< (u8) (remove_metadata ? 0 : 1);
		}
		m_clients.unlock();

		// Send as reliable
		if (pkt.getSize() > 0)
			m_clients.send(*i, 0, &pkt, true);
	}
}

void Server::setBlockNotSent(v3s16 p)
{
	std::vector<u16> clients = m_clients.getClientIDs();
	m_clients.lock();
	for(std::vector<u16>::iterator i = clients.begin();
		i != clients.end(); ++i) {
		RemoteClient *client = m_clients.lockedGetClientNoEx(*i);
		client->SetBlockNotSent(p);
	}
	m_clients.unlock();
}

void Server::SendBlockNoLock(u16 peer_id, MapBlock *block, u8 ver, u16 net_proto_version)
{
	DSTACK(FUNCTION_NAME);

	v3s16 p = block->getPos();

	/*
		Create a packet with the block in the right format
	*/

	std::ostringstream os(std::ios_base::binary);
	block->serialize(os, ver, false);
	block->serializeNetworkSpecific(os);
	std::string s = os.str();

	NetworkPacket pkt(TOCLIENT_BLOCKDATA, 2 + 2 + 2 + 2 + s.size(), peer_id);

	pkt << p;
	pkt.putRawString(s.c_str(), s.size());
	Send(&pkt);
}

void Server::SendBlocks(float dtime)
{
	DSTACK(FUNCTION_NAME);

	MutexAutoLock envlock(m_env_mutex);
	//TODO check if one big lock could be faster then multiple small ones

	ScopeProfiler sp(g_profiler, "Server: sel and send blocks to clients");

	std::vector<PrioritySortedBlockTransfer> queue;

	s32 total_sending = 0;

	{
		ScopeProfiler sp(g_profiler, "Server: selecting blocks for sending");

		std::vector<u16> clients = m_clients.getClientIDs();

		m_clients.lock();
		for(std::vector<u16>::iterator i = clients.begin();
			i != clients.end(); ++i) {
			RemoteClient *client = m_clients.lockedGetClientNoEx(*i, CS_Active);

			if (client == NULL)
				continue;

			total_sending += client->SendingCount();
			client->GetNextBlocks(m_env,m_emerge, dtime, queue);
		}
		m_clients.unlock();
	}

	// Sort.
	// Lowest priority number comes first.
	// Lowest is most important.
	std::sort(queue.begin(), queue.end());

	m_clients.lock();
	for(u32 i=0; i<queue.size(); i++)
	{
		//TODO: Calculate limit dynamically
		if(total_sending >= g_settings->getS32
				("max_simultaneous_block_sends_server_total"))
			break;

		PrioritySortedBlockTransfer q = queue[i];

		MapBlock *block = NULL;
		try
		{
			block = m_env->getMap().getBlockNoCreate(q.pos);
		}
		catch(InvalidPositionException &e)
		{
			continue;
		}

		RemoteClient *client = m_clients.lockedGetClientNoEx(q.peer_id, CS_Active);

		if(!client)
			continue;

		SendBlockNoLock(q.peer_id, block, client->serialization_version, client->net_proto_version);

		client->SentBlock(q.pos);
		total_sending++;
	}
	m_clients.unlock();
}

void Server::fillMediaCache()
{
	DSTACK(FUNCTION_NAME);

	infostream<<"Server: Calculating media file checksums"<<std::endl;

	// Collect all media file paths
	std::vector<std::string> paths;
	for(std::vector<ModSpec>::iterator i = m_mods.begin();
			i != m_mods.end(); ++i) {
		const ModSpec &mod = *i;
		paths.push_back(mod.path + DIR_DELIM + "textures");
		paths.push_back(mod.path + DIR_DELIM + "sounds");
		paths.push_back(mod.path + DIR_DELIM + "media");
		paths.push_back(mod.path + DIR_DELIM + "models");
	}
	paths.push_back(porting::path_user + DIR_DELIM + "textures" + DIR_DELIM + "server");

	// Collect media file information from paths into cache
	for(std::vector<std::string>::iterator i = paths.begin();
			i != paths.end(); ++i) {
		std::string mediapath = *i;
		std::vector<fs::DirListNode> dirlist = fs::GetDirListing(mediapath);
		for (u32 j = 0; j < dirlist.size(); j++) {
			if (dirlist[j].dir) // Ignode dirs
				continue;
			std::string filename = dirlist[j].name;
			// If name contains illegal characters, ignore the file
			if (!string_allowed(filename, TEXTURENAME_ALLOWED_CHARS)) {
				infostream<<"Server: ignoring illegal file name: \""
						<< filename << "\"" << std::endl;
				continue;
			}
			// If name is not in a supported format, ignore it
			const char *supported_ext[] = {
				".png", ".jpg", ".bmp", ".tga",
				".pcx", ".ppm", ".psd", ".wal", ".rgb",
				".ogg",
				".x", ".b3d", ".md2", ".obj",
				NULL
			};
			if (removeStringEnd(filename, supported_ext) == ""){
				infostream << "Server: ignoring unsupported file extension: \""
						<< filename << "\"" << std::endl;
				continue;
			}
			// Ok, attempt to load the file and add to cache
			std::string filepath = mediapath + DIR_DELIM + filename;
			// Read data
			std::ifstream fis(filepath.c_str(), std::ios_base::binary);
			if (!fis.good()) {
				errorstream << "Server::fillMediaCache(): Could not open \""
						<< filename << "\" for reading" << std::endl;
				continue;
			}
			std::ostringstream tmp_os(std::ios_base::binary);
			bool bad = false;
			for(;;) {
				char buf[1024];
				fis.read(buf, 1024);
				std::streamsize len = fis.gcount();
				tmp_os.write(buf, len);
				if (fis.eof())
					break;
				if (!fis.good()) {
					bad = true;
					break;
				}
			}
			if(bad) {
				errorstream<<"Server::fillMediaCache(): Failed to read \""
						<< filename << "\"" << std::endl;
				continue;
			}
			if(tmp_os.str().length() == 0) {
				errorstream << "Server::fillMediaCache(): Empty file \""
						<< filepath << "\"" << std::endl;
				continue;
			}

			SHA1 sha1;
			sha1.addBytes(tmp_os.str().c_str(), tmp_os.str().length());

			unsigned char *digest = sha1.getDigest();
			std::string sha1_base64 = base64_encode(digest, 20);
			std::string sha1_hex = hex_encode((char*)digest, 20);
			free(digest);

			// Put in list
			m_media[filename] = MediaInfo(filepath, sha1_base64);
			verbosestream << "Server: " << sha1_hex << " is " << filename
					<< std::endl;
		}
	}
}

void Server::sendMediaAnnouncement(u16 peer_id)
{
	DSTACK(FUNCTION_NAME);

	verbosestream << "Server: Announcing files to id(" << peer_id << ")"
		<< std::endl;

	// Make packet
	std::ostringstream os(std::ios_base::binary);

	NetworkPacket pkt(TOCLIENT_ANNOUNCE_MEDIA, 0, peer_id);
	pkt << (u16) m_media.size();

	for (std::unordered_map<std::string, MediaInfo>::iterator i = m_media.begin();
			i != m_media.end(); ++i) {
		pkt << i->first << i->second.sha1_digest;
	}

	pkt << g_settings->get("remote_media");
	Send(&pkt);
}

struct SendableMedia
{
	std::string name;
	std::string path;
	std::string data;

	SendableMedia(const std::string &name_="", const std::string &path_="",
	              const std::string &data_=""):
		name(name_),
		path(path_),
		data(data_)
	{}
};

void Server::sendRequestedMedia(u16 peer_id,
		const std::vector<std::string> &tosend)
{
	DSTACK(FUNCTION_NAME);

	verbosestream<<"Server::sendRequestedMedia(): "
			<<"Sending files to client"<<std::endl;

	/* Read files */

	// Put 5kB in one bunch (this is not accurate)
	u32 bytes_per_bunch = 5000;

	std::vector< std::vector<SendableMedia> > file_bunches;
	file_bunches.push_back(std::vector<SendableMedia>());

	u32 file_size_bunch_total = 0;

	for(std::vector<std::string>::const_iterator i = tosend.begin();
			i != tosend.end(); ++i) {
		const std::string &name = *i;

		if (m_media.find(name) == m_media.end()) {
			errorstream<<"Server::sendRequestedMedia(): Client asked for "
					<<"unknown file \""<<(name)<<"\""<<std::endl;
			continue;
		}

		//TODO get path + name
		std::string tpath = m_media[name].path;

		// Read data
		std::ifstream fis(tpath.c_str(), std::ios_base::binary);
		if(fis.good() == false){
			errorstream<<"Server::sendRequestedMedia(): Could not open \""
					<<tpath<<"\" for reading"<<std::endl;
			continue;
		}
		std::ostringstream tmp_os(std::ios_base::binary);
		bool bad = false;
		for(;;) {
			char buf[1024];
			fis.read(buf, 1024);
			std::streamsize len = fis.gcount();
			tmp_os.write(buf, len);
			file_size_bunch_total += len;
			if(fis.eof())
				break;
			if(!fis.good()) {
				bad = true;
				break;
			}
		}
		if(bad) {
			errorstream<<"Server::sendRequestedMedia(): Failed to read \""
					<<name<<"\""<<std::endl;
			continue;
		}
		/*infostream<<"Server::sendRequestedMedia(): Loaded \""
				<<tname<<"\""<<std::endl;*/
		// Put in list
		file_bunches[file_bunches.size()-1].push_back(
				SendableMedia(name, tpath, tmp_os.str()));

		// Start next bunch if got enough data
		if(file_size_bunch_total >= bytes_per_bunch) {
			file_bunches.push_back(std::vector<SendableMedia>());
			file_size_bunch_total = 0;
		}

	}

	/* Create and send packets */

	u16 num_bunches = file_bunches.size();
	for(u16 i = 0; i < num_bunches; i++) {
		/*
			u16 command
			u16 total number of texture bunches
			u16 index of this bunch
			u32 number of files in this bunch
			for each file {
				u16 length of name
				string name
				u32 length of data
				data
			}
		*/

		NetworkPacket pkt(TOCLIENT_MEDIA, 4 + 0, peer_id);
		pkt << num_bunches << i << (u32) file_bunches[i].size();

		for(std::vector<SendableMedia>::iterator
				j = file_bunches[i].begin();
				j != file_bunches[i].end(); ++j) {
			pkt << j->name;
			pkt.putLongString(j->data);
		}

		verbosestream << "Server::sendRequestedMedia(): bunch "
				<< i << "/" << num_bunches
				<< " files=" << file_bunches[i].size()
				<< " size="  << pkt.getSize() << std::endl;
		Send(&pkt);
	}
}

void Server::sendDetachedInventory(const std::string &name, u16 peer_id)
{
	if(m_detached_inventories.count(name) == 0) {
		errorstream<<FUNCTION_NAME<<": \""<<name<<"\" not found"<<std::endl;
		return;
	}
	Inventory *inv = m_detached_inventories[name];
	std::ostringstream os(std::ios_base::binary);

	os << serializeString(name);
	inv->serialize(os);

	// Make data buffer
	std::string s = os.str();

	NetworkPacket pkt(TOCLIENT_DETACHED_INVENTORY, 0, peer_id);
	pkt.putRawString(s.c_str(), s.size());

	const std::string &check = m_detached_inventories_player[name];
	if (peer_id == PEER_ID_INEXISTENT) {
		if (check == "")
			return m_clients.sendToAll(&pkt);
		RemotePlayer *p = m_env->getPlayer(check.c_str());
		if (p)
			m_clients.send(p->peer_id, 0, &pkt, true);
	} else {
		if (check == "" || getPlayerName(peer_id) == check)
			Send(&pkt);
	}
}

void Server::sendDetachedInventories(u16 peer_id)
{
	DSTACK(FUNCTION_NAME);

	for(std::map<std::string, Inventory*>::iterator
			i = m_detached_inventories.begin();
			i != m_detached_inventories.end(); ++i) {
		const std::string &name = i->first;
		//Inventory *inv = i->second;
		sendDetachedInventory(name, peer_id);
	}
}

/*
	Something random
*/

void Server::DiePlayer(u16 peer_id)
{
	DSTACK(FUNCTION_NAME);
	PlayerSAO *playersao = getPlayerSAO(peer_id);
	// In some rare cases this can be NULL -- if the player is disconnected
	// when a Lua function modifies l_punch, for example
	if (!playersao)
		return;

	infostream << "Server::DiePlayer(): Player "
			<< playersao->getPlayer()->getName()
			<< " dies" << std::endl;

	playersao->setHP(0);

	// Trigger scripted stuff
	m_script->on_dieplayer(playersao);

	SendPlayerHP(peer_id);
	SendDeathscreen(peer_id, false, v3f(0,0,0));
}

void Server::RespawnPlayer(u16 peer_id)
{
	DSTACK(FUNCTION_NAME);

	PlayerSAO *playersao = getPlayerSAO(peer_id);
	assert(playersao);

	infostream << "Server::RespawnPlayer(): Player "
			<< playersao->getPlayer()->getName()
			<< " respawns" << std::endl;

	playersao->setHP(PLAYER_MAX_HP);
	playersao->setBreath(PLAYER_MAX_BREATH);

	bool repositioned = m_script->on_respawnplayer(playersao);
	if (!repositioned) {
		// setPos will send the new position to client
		playersao->setPos(findSpawnPos());
	}

	SendPlayerHP(peer_id);
}


void Server::DenySudoAccess(u16 peer_id)
{
	DSTACK(FUNCTION_NAME);

	NetworkPacket pkt(TOCLIENT_DENY_SUDO_MODE, 0, peer_id);
	Send(&pkt);
}


void Server::DenyAccessVerCompliant(u16 peer_id, u16 proto_ver, AccessDeniedCode reason,
		const std::string &str_reason, bool reconnect)
{
	if (proto_ver >= 25) {
		SendAccessDenied(peer_id, reason, str_reason, reconnect);
	} else {
		std::wstring wreason = utf8_to_wide(
			reason == SERVER_ACCESSDENIED_CUSTOM_STRING ? str_reason :
			accessDeniedStrings[(u8)reason]);
		SendAccessDenied_Legacy(peer_id, wreason);
	}

	m_clients.event(peer_id, CSE_SetDenied);
	m_con.DisconnectPeer(peer_id);
}


void Server::DenyAccess(u16 peer_id, AccessDeniedCode reason, const std::string &custom_reason)
{
	DSTACK(FUNCTION_NAME);

	SendAccessDenied(peer_id, reason, custom_reason);
	m_clients.event(peer_id, CSE_SetDenied);
	m_con.DisconnectPeer(peer_id);
}

// 13/03/15: remove this function when protocol version 25 will become
// the minimum version for MT users, maybe in 1 year
void Server::DenyAccess_Legacy(u16 peer_id, const std::wstring &reason)
{
	DSTACK(FUNCTION_NAME);

	SendAccessDenied_Legacy(peer_id, reason);
	m_clients.event(peer_id, CSE_SetDenied);
	m_con.DisconnectPeer(peer_id);
}

void Server::acceptAuth(u16 peer_id, bool forSudoMode)
{
	DSTACK(FUNCTION_NAME);

	if (!forSudoMode) {
		RemoteClient* client = getClient(peer_id, CS_Invalid);

		NetworkPacket resp_pkt(TOCLIENT_AUTH_ACCEPT, 1 + 6 + 8 + 4, peer_id);

		// Right now, the auth mechs don't change between login and sudo mode.
		u32 sudo_auth_mechs = client->allowed_auth_mechs;
		client->allowed_sudo_mechs = sudo_auth_mechs;

		resp_pkt << v3f(0,0,0) << (u64) m_env->getServerMap().getSeed()
				<< g_settings->getFloat("dedicated_server_step")
				<< sudo_auth_mechs;

		Send(&resp_pkt);
		m_clients.event(peer_id, CSE_AuthAccept);
	} else {
		NetworkPacket resp_pkt(TOCLIENT_ACCEPT_SUDO_MODE, 1 + 6 + 8 + 4, peer_id);

		// We only support SRP right now
		u32 sudo_auth_mechs = AUTH_MECHANISM_FIRST_SRP;

		resp_pkt << sudo_auth_mechs;
		Send(&resp_pkt);
		m_clients.event(peer_id, CSE_SudoSuccess);
	}
}

void Server::DeleteClient(u16 peer_id, ClientDeletionReason reason)
{
	DSTACK(FUNCTION_NAME);
	std::wstring message;
	{
		/*
			Clear references to playing sounds
		*/
		for (std::unordered_map<s32, ServerPlayingSound>::iterator
				 i = m_playing_sounds.begin(); i != m_playing_sounds.end();) {
			ServerPlayingSound &psound = i->second;
			psound.clients.erase(peer_id);
			if (psound.clients.empty())
				m_playing_sounds.erase(i++);
			else
				++i;
		}

		RemotePlayer *player = m_env->getPlayer(peer_id);

		/* Run scripts and remove from environment */
		if (player != NULL) {
			PlayerSAO *playersao = player->getPlayerSAO();
			assert(playersao);

			// inform connected clients
			NetworkPacket notice(TOCLIENT_UPDATE_PLAYER_LIST, 0, PEER_ID_INEXISTENT);
			// (u16) 1 + std::string represents a vector serialization representation
			notice << (u8) PLAYER_LIST_REMOVE  << (u16) 1 << std::string(playersao->getPlayer()->getName());
			m_clients.sendToAll(&notice);
			// run scripts
			m_script->on_leaveplayer(playersao, reason == CDR_TIMEOUT);

			playersao->disconnected();
		}

		/*
			Print out action
		*/
		{
			if(player != NULL && reason != CDR_DENY) {
				std::ostringstream os(std::ios_base::binary);
				std::vector<u16> clients = m_clients.getClientIDs();

				for(std::vector<u16>::iterator i = clients.begin();
					i != clients.end(); ++i) {
					// Get player
					RemotePlayer *player = m_env->getPlayer(*i);
					if (!player)
						continue;

					// Get name of player
					os << player->getName() << " ";
				}

				std::string name = player->getName();
				actionstream << name << " "
						<< (reason == CDR_TIMEOUT ? "times out." : "leaves game.")
						<< " List of players: " << os.str() << std::endl;
				if (m_admin_chat)
					m_admin_chat->outgoing_queue.push_back(
						new ChatEventNick(CET_NICK_REMOVE, name));
			}
		}
		{
			MutexAutoLock env_lock(m_env_mutex);
			m_clients.DeleteClient(peer_id);
		}
	}

	// Send leave chat message to all remaining clients
	if (!message.empty()) {
		SendChatMessage(PEER_ID_INEXISTENT,
				ChatMessage(CHATMESSAGE_TYPE_ANNOUNCE, message));
	}
}

void Server::UpdateCrafting(RemotePlayer *player)
{
	DSTACK(FUNCTION_NAME);

	// Get a preview for crafting
	ItemStack preview;
	InventoryLocation loc;
	loc.setPlayer(player->getName());
	std::vector<ItemStack> output_replacements;
	getCraftingResult(&player->inventory, preview, output_replacements, false, this);
	m_env->getScriptIface()->item_CraftPredict(preview, player->getPlayerSAO(),
			(&player->inventory)->getList("craft"), loc);

	// Put the new preview in
	InventoryList *plist = player->inventory.getList("craftpreview");
	sanity_check(plist);
	sanity_check(plist->getSize() >= 1);
	plist->changeItem(0, preview);
}

void Server::handleChatInterfaceEvent(ChatEvent *evt)
{
	if (evt->type == CET_NICK_ADD) {
		// The terminal informed us of its nick choice
		m_admin_nick = ((ChatEventNick *)evt)->nick;
		if (!m_script->getAuth(m_admin_nick, NULL, NULL)) {
			errorstream << "You haven't set up an account." << std::endl
				<< "Please log in using the client as '"
				<< m_admin_nick << "' with a secure password." << std::endl
				<< "Until then, you can't execute admin tasks via the console," << std::endl
				<< "and everybody can claim the user account instead of you," << std::endl
				<< "giving them full control over this server." << std::endl;
		}
	} else {
		assert(evt->type == CET_CHAT);
		handleAdminChat((ChatEventChat *)evt);
	}
}

std::wstring Server::handleChat(const std::string &name, const std::wstring &wname,
	std::wstring wmessage, bool check_shout_priv, RemotePlayer *player)
{
	// If something goes wrong, this player is to blame
	RollbackScopeActor rollback_scope(m_rollback,
		std::string("player:") + name);

	if (g_settings->getBool("strip_color_codes"))
		wmessage = unescape_enriched(wmessage);

	if (player) {
		switch (player->canSendChatMessage()) {
			case RPLAYER_CHATRESULT_FLOODING: {
				std::wstringstream ws;
				ws << L"You cannot send more messages. You are limited to "
				   << g_settings->getFloat("chat_message_limit_per_10sec")
				   << L" messages per 10 seconds.";
				return ws.str();
			}
			case RPLAYER_CHATRESULT_KICK:
				DenyAccess_Legacy(player->peer_id,
						L"You have been kicked due to message flooding.");
				return L"";
			case RPLAYER_CHATRESULT_OK:
				break;
			default:
				FATAL_ERROR("Unhandled chat filtering result found.");
		}
	}

	if (m_max_chatmessage_length > 0
			&& wmessage.length() > m_max_chatmessage_length) {
		return L"Your message exceed the maximum chat message limit set on the server. "
				L"It was refused. Send a shorter message";
	}

	// Run script hook, exit if script ate the chat message
	if (m_script->on_chat_message(name, wide_to_utf8(wmessage)))
		return L"";

	// Line to send
	std::wstring line;
	// Whether to send line to the player that sent the message, or to all players
	bool broadcast_line = true;

	if (check_shout_priv && !checkPriv(name, "shout")) {
		line += L"-!- You don't have permission to shout.";
		broadcast_line = false;
	} else {
		line += L"<";
		line += wname;
		line += L"> ";
		line += wmessage;
	}

	/*
		Tell calling method to send the message to sender
	*/
	if (!broadcast_line) {
		return line;
	} else {
		/*
			Send the message to others
		*/
		actionstream << "CHAT: " << wide_to_narrow(unescape_enriched(line)) << std::endl;

		std::vector<u16> clients = m_clients.getClientIDs();

		/*
			Send the message back to the inital sender
			if they are using protocol version >= 29
		*/

		u16 peer_id_to_avoid_sending = (player ? player->peer_id : PEER_ID_INEXISTENT);
		if (player && player->protocol_version >= 29)
			peer_id_to_avoid_sending = PEER_ID_INEXISTENT;

		for (u16 i = 0; i < clients.size(); i++) {
			u16 cid = clients[i];
			if (cid != peer_id_to_avoid_sending)
				SendChatMessage(cid, ChatMessage(line));
		}
	}
	return L"";
}

void Server::handleAdminChat(const ChatEventChat *evt)
{
	std::string name = evt->nick;
	std::wstring wname = utf8_to_wide(name);
	std::wstring wmessage = evt->evt_msg;

	std::wstring answer = handleChat(name, wname, wmessage);

	// If asked to send answer to sender
	if (!answer.empty()) {
		m_admin_chat->outgoing_queue.push_back(new ChatEventChat("", answer));
	}
}

RemoteClient* Server::getClient(u16 peer_id, ClientState state_min)
{
	RemoteClient *client = getClientNoEx(peer_id,state_min);
	if(!client)
		throw ClientNotFoundException("Client not found");

	return client;
}
RemoteClient* Server::getClientNoEx(u16 peer_id, ClientState state_min)
{
	return m_clients.getClientNoEx(peer_id, state_min);
}

std::string Server::getPlayerName(u16 peer_id)
{
	RemotePlayer *player = m_env->getPlayer(peer_id);
	if (player == NULL)
		return "[id="+itos(peer_id)+"]";
	return player->getName();
}

PlayerSAO* Server::getPlayerSAO(u16 peer_id)
{
	RemotePlayer *player = m_env->getPlayer(peer_id);
	if (player == NULL)
		return NULL;
	return player->getPlayerSAO();
}

std::wstring Server::getStatusString()
{
	std::wostringstream os(std::ios_base::binary);
	os<<L"# Server: ";
	// Version
	os<<L"version="<<narrow_to_wide(g_version_string);
	// Uptime
	os<<L", uptime="<<m_uptime.get();
	// Max lag estimate
	os<<L", max_lag="<<m_env->getMaxLagEstimate();
	// Information about clients
	bool first = true;
	os<<L", clients={";
	std::vector<u16> clients = m_clients.getClientIDs();
	for (std::vector<u16>::iterator i = clients.begin(); i != clients.end(); ++i) {
		// Get player
		RemotePlayer *player = m_env->getPlayer(*i);
		// Get name of player
		std::wstring name = L"unknown";
		if (player != NULL)
			name = narrow_to_wide(player->getName());
		// Add name to information string
		if(!first)
			os << L", ";
		else
			first = false;
		os << name;
	}
	os << L"}";
	if(((ServerMap*)(&m_env->getMap()))->isSavingEnabled() == false)
		os<<std::endl<<L"# Server: "<<" WARNING: Map saving is disabled.";
	if(g_settings->get("motd") != "")
		os<<std::endl<<L"# Server: "<<narrow_to_wide(g_settings->get("motd"));
	return os.str();
}

std::set<std::string> Server::getPlayerEffectivePrivs(const std::string &name)
{
	std::set<std::string> privs;
	m_script->getAuth(name, NULL, &privs);
	return privs;
}

bool Server::checkPriv(const std::string &name, const std::string &priv)
{
	std::set<std::string> privs = getPlayerEffectivePrivs(name);
	return (privs.count(priv) != 0);
}

void Server::reportPrivsModified(const std::string &name)
{
	if(name == "") {
		std::vector<u16> clients = m_clients.getClientIDs();
		for(std::vector<u16>::iterator i = clients.begin();
				i != clients.end(); ++i) {
			RemotePlayer *player = m_env->getPlayer(*i);
			reportPrivsModified(player->getName());
		}
	} else {
		RemotePlayer *player = m_env->getPlayer(name.c_str());
		if (!player)
			return;
		SendPlayerPrivileges(player->peer_id);
		PlayerSAO *sao = player->getPlayerSAO();
		if(!sao)
			return;
		sao->updatePrivileges(
				getPlayerEffectivePrivs(name),
				isSingleplayer());
	}
}

void Server::reportInventoryFormspecModified(const std::string &name)
{
	RemotePlayer *player = m_env->getPlayer(name.c_str());
	if (!player)
		return;
	SendPlayerInventoryFormspec(player->peer_id);
}

void Server::setIpBanned(const std::string &ip, const std::string &name)
{
	m_banmanager->add(ip, name);
}

void Server::unsetIpBanned(const std::string &ip_or_name)
{
	m_banmanager->remove(ip_or_name);
}

std::string Server::getBanDescription(const std::string &ip_or_name)
{
	return m_banmanager->getBanDescription(ip_or_name);
}

void Server::notifyPlayer(const char *name, const std::wstring &msg)
{
	// m_env will be NULL if the server is initializing
	if (!m_env)
		return;

	if (m_admin_nick == name && !m_admin_nick.empty()) {
		m_admin_chat->outgoing_queue.push_back(new ChatEventChat("", msg));
	}

	RemotePlayer *player = m_env->getPlayer(name);
	if (!player) {
		return;
	}

	if (player->peer_id == PEER_ID_INEXISTENT)
		return;

	SendChatMessage(player->peer_id, ChatMessage(msg));
}

bool Server::showFormspec(const char *playername, const std::string &formspec,
	const std::string &formname)
{
	// m_env will be NULL if the server is initializing
	if (!m_env)
		return false;

	RemotePlayer *player = m_env->getPlayer(playername);
	if (!player)
		return false;

	SendShowFormspecMessage(player->peer_id, formspec, formname);
	return true;
}

u32 Server::hudAdd(RemotePlayer *player, HudElement *form)
{
	if (!player)
		return -1;

	u32 id = player->addHud(form);

	SendHUDAdd(player->peer_id, id, form);

	return id;
}

bool Server::hudRemove(RemotePlayer *player, u32 id) {
	if (!player)
		return false;

	HudElement* todel = player->removeHud(id);

	if (!todel)
		return false;

	delete todel;

	SendHUDRemove(player->peer_id, id);
	return true;
}

bool Server::hudChange(RemotePlayer *player, u32 id, HudElementStat stat, void *data)
{
	if (!player)
		return false;

	SendHUDChange(player->peer_id, id, stat, data);
	return true;
}

bool Server::hudSetFlags(RemotePlayer *player, u32 flags, u32 mask)
{
	if (!player)
		return false;

	SendHUDSetFlags(player->peer_id, flags, mask);
	player->hud_flags &= ~mask;
	player->hud_flags |= flags;

	PlayerSAO* playersao = player->getPlayerSAO();

	if (playersao == NULL)
		return false;

	m_script->player_event(playersao, "hud_changed");
	return true;
}

bool Server::hudSetHotbarItemcount(RemotePlayer *player, s32 hotbar_itemcount)
{
	if (!player)
		return false;

	if (hotbar_itemcount <= 0 || hotbar_itemcount > HUD_HOTBAR_ITEMCOUNT_MAX)
		return false;

	player->setHotbarItemcount(hotbar_itemcount);
	std::ostringstream os(std::ios::binary);
	writeS32(os, hotbar_itemcount);
	SendHUDSetParam(player->peer_id, HUD_PARAM_HOTBAR_ITEMCOUNT, os.str());
	return true;
}

void Server::hudSetHotbarImage(RemotePlayer *player, std::string name)
{
	if (!player)
		return;

	player->setHotbarImage(name);
	SendHUDSetParam(player->peer_id, HUD_PARAM_HOTBAR_IMAGE, name);
}

std::string Server::hudGetHotbarImage(RemotePlayer *player)
{
	if (!player)
		return "";
	return player->getHotbarImage();
}

void Server::hudSetHotbarSelectedImage(RemotePlayer *player, std::string name)
{
	if (!player)
		return;

	player->setHotbarSelectedImage(name);
	SendHUDSetParam(player->peer_id, HUD_PARAM_HOTBAR_SELECTED_IMAGE, name);
}

bool Server::setLocalPlayerAnimations(RemotePlayer *player,
		v2s32 animation_frames[4], f32 frame_speed)
{
	if (!player)
		return false;

	player->setLocalAnimations(animation_frames, frame_speed);
	SendLocalPlayerAnimations(player->peer_id, animation_frames, frame_speed);
	return true;
}

bool Server::setPlayerEyeOffset(RemotePlayer *player, v3f first, v3f third)
{
	if (!player)
		return false;

	player->eye_offset_first = first;
	player->eye_offset_third = third;
	SendEyeOffset(player->peer_id, first, third);
	return true;
}

bool Server::setSky(RemotePlayer *player, const video::SColor &bgcolor,
	const std::string &type, const std::vector<std::string> &params,
	bool &clouds)
{
	if (!player)
		return false;

	player->setSky(bgcolor, type, params, clouds);
	SendSetSky(player->peer_id, bgcolor, type, params, clouds);
	return true;
}

bool Server::setClouds(RemotePlayer *player, float density,
	const video::SColor &color_bright,
	const video::SColor &color_ambient,
	float height,
	float thickness,
	const v2f &speed)
{
	if (!player)
		return false;

	SendCloudParams(player->peer_id, density,
			color_bright, color_ambient, height,
			thickness, speed);
	return true;
}

bool Server::overrideDayNightRatio(RemotePlayer *player, bool do_override,
	float ratio)
{
	if (!player)
		return false;

	player->overrideDayNightRatio(do_override, ratio);
	SendOverrideDayNightRatio(player->peer_id, do_override, ratio);
	return true;
}

void Server::notifyPlayers(const std::wstring &msg)
{
	SendChatMessage(PEER_ID_INEXISTENT, ChatMessage(msg));
}

void Server::spawnParticle(const std::string &playername, v3f pos,
	v3f velocity, v3f acceleration,
	float expirationtime, float size, bool
	collisiondetection, bool collision_removal,
	bool vertical, const std::string &texture,
	const struct TileAnimationParams &animation, u8 glow)
{
	// m_env will be NULL if the server is initializing
	if (!m_env)
		return;

	u16 peer_id = PEER_ID_INEXISTENT, proto_ver = 0;
	if (playername != "") {
		RemotePlayer *player = m_env->getPlayer(playername.c_str());
		if (!player)
			return;
		peer_id = player->peer_id;
		proto_ver = player->protocol_version;
	}

	SendSpawnParticle(peer_id, proto_ver, pos, velocity, acceleration,
			expirationtime, size, collisiondetection,
			collision_removal, vertical, texture, animation, glow);
}

u32 Server::addParticleSpawner(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 collision_removal,
	ServerActiveObject *attached, bool vertical, const std::string &texture,
	const std::string &playername, const struct TileAnimationParams &animation,
	u8 glow)
{
	// m_env will be NULL if the server is initializing
	if (!m_env)
		return -1;

	u16 peer_id = PEER_ID_INEXISTENT, proto_ver = 0;
	if (playername != "") {
		RemotePlayer *player = m_env->getPlayer(playername.c_str());
		if (!player)
			return -1;
		peer_id = player->peer_id;
		proto_ver = player->protocol_version;
	}

	u16 attached_id = attached ? attached->getId() : 0;

	u32 id;
	if (attached_id == 0)
		id = m_env->addParticleSpawner(spawntime);
	else
		id = m_env->addParticleSpawner(spawntime, attached_id);

	SendAddParticleSpawner(peer_id, proto_ver, amount, spawntime,
		minpos, maxpos, minvel, maxvel, minacc, maxacc,
		minexptime, maxexptime, minsize, maxsize,
		collisiondetection, collision_removal, attached_id, vertical,
		texture, id, animation, glow);

	return id;
}

void Server::deleteParticleSpawner(const std::string &playername, u32 id)
{
	// m_env will be NULL if the server is initializing
	if (!m_env)
		throw ServerError("Can't delete particle spawners during initialisation!");

	u16 peer_id = PEER_ID_INEXISTENT;
	if (playername != "") {
		RemotePlayer *player = m_env->getPlayer(playername.c_str());
		if (!player)
			return;
		peer_id = player->peer_id;
	}

	m_env->deleteParticleSpawner(id);
	SendDeleteParticleSpawner(peer_id, id);
}

Inventory* Server::createDetachedInventory(const std::string &name, const std::string &player)
{
	if(m_detached_inventories.count(name) > 0){
		infostream<<"Server clearing detached inventory \""<<name<<"\""<<std::endl;
		delete m_detached_inventories[name];
	} else {
		infostream<<"Server creating detached inventory \""<<name<<"\""<<std::endl;
	}
	Inventory *inv = new Inventory(m_itemdef);
	sanity_check(inv);
	m_detached_inventories[name] = inv;
	m_detached_inventories_player[name] = player;
	//TODO find a better way to do this
	sendDetachedInventory(name,PEER_ID_INEXISTENT);
	return inv;
}

// actions: time-reversed list
// Return value: success/failure
bool Server::rollbackRevertActions(const std::list<RollbackAction> &actions,
		std::list<std::string> *log)
{
	infostream<<"Server::rollbackRevertActions(len="<<actions.size()<<")"<<std::endl;
	ServerMap *map = (ServerMap*)(&m_env->getMap());

	// Fail if no actions to handle
	if(actions.empty()){
		log->push_back("Nothing to do.");
		return false;
	}

	int num_tried = 0;
	int num_failed = 0;

	for(std::list<RollbackAction>::const_iterator
			i = actions.begin();
			i != actions.end(); ++i)
	{
		const RollbackAction &action = *i;
		num_tried++;
		bool success = action.applyRevert(map, this, this);
		if(!success){
			num_failed++;
			std::ostringstream os;
			os<<"Revert of step ("<<num_tried<<") "<<action.toString()<<" failed";
			infostream<<"Map::rollbackRevertActions(): "<<os.str()<<std::endl;
			if(log)
				log->push_back(os.str());
		}else{
			std::ostringstream os;
			os<<"Successfully reverted step ("<<num_tried<<") "<<action.toString();
			infostream<<"Map::rollbackRevertActions(): "<<os.str()<<std::endl;
			if(log)
				log->push_back(os.str());
		}
	}

	infostream<<"Map::rollbackRevertActions(): "<<num_failed<<"/"<<num_tried
			<<" failed"<<std::endl;

	// Call it done if less than half failed
	return num_failed <= num_tried/2;
}

// IGameDef interface
// Under envlock
IItemDefManager *Server::getItemDefManager()
{
	return m_itemdef;
}

INodeDefManager *Server::getNodeDefManager()
{
	return m_nodedef;
}

ICraftDefManager *Server::getCraftDefManager()
{
	return m_craftdef;
}

u16 Server::allocateUnknownNodeId(const std::string &name)
{
	return m_nodedef->allocateDummy(name);
}

MtEventManager *Server::getEventManager()
{
	return m_event;
}

IWritableItemDefManager *Server::getWritableItemDefManager()
{
	return m_itemdef;
}

IWritableNodeDefManager *Server::getWritableNodeDefManager()
{
	return m_nodedef;
}

IWritableCraftDefManager *Server::getWritableCraftDefManager()
{
	return m_craftdef;
}

const ModSpec *Server::getModSpec(const std::string &modname) const
{
	std::vector<ModSpec>::const_iterator it;
	for (it = m_mods.begin(); it != m_mods.end(); ++it) {
		const ModSpec &mod = *it;
		if (mod.name == modname)
			return &mod;
	}
	return NULL;
}

void Server::getModNames(std::vector<std::string> &modlist)
{
	std::vector<ModSpec>::iterator it;
	for (it = m_mods.begin(); it != m_mods.end(); ++it)
		modlist.push_back(it->name);
}

std::string Server::getBuiltinLuaPath()
{
	return porting::path_share + DIR_DELIM + "builtin";
}

std::string Server::getModStoragePath() const
{
	return m_path_world + DIR_DELIM + "mod_storage";
}

v3f Server::findSpawnPos()
{
	ServerMap &map = m_env->getServerMap();
	v3f nodeposf;
	if (g_settings->getV3FNoEx("static_spawnpoint", nodeposf)) {
		return nodeposf * BS;
	}

	bool is_good = false;
	// Limit spawn range to mapgen edges (determined by 'mapgen_limit')
	s32 range_max = map.getMapgenParams()->getSpawnRangeMax();

	// Try to find a good place a few times
	for(s32 i = 0; i < 4000 && !is_good; i++) {
		s32 range = MYMIN(1 + i, range_max);
		// We're going to try to throw the player to this position
		v2s16 nodepos2d = v2s16(
			-range + (myrand() % (range * 2)),
			-range + (myrand() % (range * 2)));

		// Get spawn level at point
		s16 spawn_level = m_emerge->getSpawnLevelAtPoint(nodepos2d);
		// Continue if MAX_MAP_GENERATION_LIMIT was returned by
		// the mapgen to signify an unsuitable spawn position
		if (spawn_level == MAX_MAP_GENERATION_LIMIT)
			continue;

		v3s16 nodepos(nodepos2d.X, spawn_level, nodepos2d.Y);

		s32 air_count = 0;
		for (s32 i = 0; i < 10; i++) {
			v3s16 blockpos = getNodeBlockPos(nodepos);
			map.emergeBlock(blockpos, true);
			content_t c = map.getNodeNoEx(nodepos).getContent();
			if (c == CONTENT_AIR || c == CONTENT_IGNORE) {
				air_count++;
				if (air_count >= 2) {
					nodeposf = intToFloat(nodepos, BS);
					// Don't spawn the player outside map boundaries
					if (objectpos_over_limit(nodeposf))
						continue;
					is_good = true;
					break;
				}
			}
			nodepos.Y++;
		}
	}

	return nodeposf;
}

void Server::requestShutdown(const std::string &msg, bool reconnect, float delay)
{
	m_shutdown_timer = delay;
	m_shutdown_msg = msg;
	m_shutdown_ask_reconnect = reconnect;

	if (delay == 0.0f) {
	// No delay, shutdown immediately
		m_shutdown_requested = true;
		// only print to the infostream, a chat message saying
		// "Server Shutting Down" is sent when the server destructs.
		infostream << "*** Immediate Server shutdown requested." << std::endl;
	} else if (delay < 0.0f && m_shutdown_timer > 0.0f) {
	// Negative delay, cancel shutdown if requested
		m_shutdown_timer = 0.0f;
		m_shutdown_msg = "";
		m_shutdown_ask_reconnect = false;
		m_shutdown_requested = false;
		std::wstringstream ws;

		ws << L"*** Server shutdown canceled.";

		infostream << wide_to_utf8(ws.str()).c_str() << std::endl;
		SendChatMessage(PEER_ID_INEXISTENT, ws.str());
	} else if (delay > 0.0f) {
	// Positive delay, tell the clients when the server will shut down
		std::wstringstream ws;

		ws << L"*** Server shutting down in "
				<< duration_to_string(myround(m_shutdown_timer)).c_str()
				<< ".";

		infostream << wide_to_utf8(ws.str()).c_str() << std::endl;
		SendChatMessage(PEER_ID_INEXISTENT, ws.str());
	}
}

PlayerSAO* Server::emergePlayer(const char *name, u16 peer_id, u16 proto_version)
{
	/*
		Try to get an existing player
	*/
	RemotePlayer *player = m_env->getPlayer(name);

	// If player is already connected, cancel
	if (player != NULL && player->peer_id != 0) {
		infostream<<"emergePlayer(): Player already connected"<<std::endl;
		return NULL;
	}

	/*
		If player with the wanted peer_id already exists, cancel.
	*/
	if (m_env->getPlayer(peer_id) != NULL) {
		infostream<<"emergePlayer(): Player with wrong name but same"
				" peer_id already exists"<<std::endl;
		return NULL;
	}

	if (!player) {
		player = new RemotePlayer(name, idef());
	}

	bool newplayer = false;

	// Load player
	PlayerSAO *playersao = m_env->loadPlayer(player, &newplayer, peer_id, isSingleplayer());

	// Complete init with server parts
	playersao->finalize(player, getPlayerEffectivePrivs(player->getName()));
	player->protocol_version = proto_version;

	/* Run scripts */
	if (newplayer) {
		m_script->on_newplayer(playersao);
	}

	return playersao;
}

bool Server::registerModStorage(ModMetadata *storage)
{
	if (m_mod_storages.find(storage->getModName()) != m_mod_storages.end()) {
		errorstream << "Unable to register same mod storage twice. Storage name: "
				<< storage->getModName() << std::endl;
		return false;
	}

	m_mod_storages[storage->getModName()] = storage;
	return true;
}

void Server::unregisterModStorage(const std::string &name)
{
	std::unordered_map<std::string, ModMetadata *>::const_iterator it = m_mod_storages.find(name);
	if (it != m_mod_storages.end()) {
		// Save unconditionaly on unregistration
		it->second->save(getModStoragePath());
		m_mod_storages.erase(name);
	}
}

void dedicated_server_loop(Server &server, bool &kill)
{
	DSTACK(FUNCTION_NAME);

	verbosestream<<"dedicated_server_loop()"<<std::endl;

	IntervalLimiter m_profiler_interval;

	static thread_local const float steplen =
			g_settings->getFloat("dedicated_server_step");
	static thread_local const float profiler_print_interval =
			g_settings->getFloat("profiler_print_interval");

	for(;;) {
		// This is kind of a hack but can be done like this
		// because server.step() is very light
		{
			ScopeProfiler sp(g_profiler, "dedicated server sleep");
			sleep_ms((int)(steplen*1000.0));
		}
		server.step(steplen);

		if (server.getShutdownRequested() || kill)
			break;

		/*
			Profiler
		*/
		if (profiler_print_interval != 0) {
			if(m_profiler_interval.step(steplen, profiler_print_interval))
			{
				infostream<<"Profiler:"<<std::endl;
				g_profiler->print(infostream);
				g_profiler->clear();
			}
		}
	}

	infostream << "Dedicated server quitting" << std::endl;
#if USE_CURL
	if (g_settings->getBool("server_announce"))
		ServerList::sendAnnounce(ServerList::AA_DELETE,
			server.m_bind_addr.getPort());
#endif
}
	Commit message (Collapse)	Author	Age
*	Better F6 profiler (#8750)	SmallJoker	2019-08-13
\| \| \| \| \| \| \|	Update the profiler names to make more sense of what they actually represent Move the profiler code from header to its source file Use monospace font to align lines Format the statistics line to align better with surrounding values Refresh the profiler each 3 seconds (roughly)
*	Fix comments	Loic Blot	2019-03-31
\|
*	EmergeManager::initMapgens use FATAL_ERROR if and drop boolean return	Loïc Blot	2019-03-31
\| \| \| \|	We never handle the boolean return, also init twice is a coding error, not a runtime error
*	num_emerge_threads: Initialise value to cope with setting syntax error (#8396)	Paramat	2019-03-18
\|
*	getS16NoEx() returns true unless syntactical error in conf. (#8304)	sofar	2019-03-05
\| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \|	The getS16NoEx() handler will return true unless there is a `[num_emerge_threads]` line in the `minetest.conf` at which point the excption handler part is reached. Due to the fact that `defaultsettings.cpp` has a default value set for this setting, that never will happen. Because of this, the code will never check the number of threads on the system, and keep `nthreads = 0`. If that happens, the value is changed to `1` and only 1 emerge thread will be used. The default should be set to `1` instead, due to the potential unsafe consequences for the standard sqlite map files, but that should be a separate commit that also adds documentation for that setting. This commit focuses on removing this `hiding` bug instead.
*	Fix crash caused by Lua error during startup (#7473)	red-001	2018-06-22
\|
*	Generate Notifier: Clear events once after all 'on generated' functions	paramat	2018-03-03
\|
*	Move files to subdirectories (#6599)	Vitaliy	2017-11-08
\| \| \| \|	* Move files around
*	Add session_t typedef + remove unused functions (#6470)	Loïc Blot	2017-09-27
\| \| \| \| \| \|	* Add session_t typedef + remove unused functions u16 peer_id is used everywhere, to be more consistent and permit some evolutions on this type in the future (i'm working on a PoC), uniformize u16 peer_id to SessionId peer_id
*	Remove DSTACK support (#6346)	Loïc Blot	2017-08-30
\| \| \|	Debugstacks is not useful, we don't really use it, the DebugStack is not pertinent, gdb and lldb are better if we really want to debug.
*	Modernize src/c* src/d* and src/e* files (#6263)	Loïc Blot	2017-08-17
\| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \|	* Modernize src/c* src/d* and src/e* files * default operator * redundant init * delete default constructors on CraftDefinition childs (never used) * fix some missing init values * const ref fix reported by clang-tidy * ranged-based for loops * simple conditions & returns * empty stl function instead of size * emplace_back stl function instead of push_back + construct temp obj * auto for some iterators * code style fixes * c++ stl headers instead of C stl headers (stdio.h -> cstdio)
*	Move MapEditEventAreaIgnorer to emerge.cpp	Loic Blot	2017-07-25
\| \| \| \|	It's only used in emerge threads and it's a local object, don't expose it to the whole Minetest
*	C++11 patchset 9: move hardcoded init parameters to class definitions (part ↵	Loïc Blot	2017-06-16
\| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \|	1) (#5984) * C++11 patchset 9: move hardcoded init parameters to class definitions C++11 introduced the possibility to define the default values directly in class definitions, do it on current code Also remove some unused attributes * CollisionInfo::bouncy * collisionMoveResult::collides_xy * collisionMoveResult::standing_on_unloaded * Clouds::speed * More constructor cleanups + some variables removal * remove only write guiFormSpecMenu::m_old_tooltip * move header included inside defintions in genericobject.h * remove some unused since years exception classes * remove unused & empty debug_stacks_init * remove unused & empty content_nodemeta_serialize_legacy * remove forgotten useless bool (bouncy) in collision.cpp code
*	C++11 patchset 2: remove util/cpp11.h and util/cpp11_container.h (#5821)	Loïc Blot	2017-06-04
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*	Rename Scripting API files for consistency	ShadowNinja	2017-04-25
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*	Map generation limit: Rewrite	paramat	2017-03-20
\| \| \| \| \| \| \| \| \| \| \| \| \| \|	The previous implementation applied the setting to blockpos_over_limit(), objectpos_over_limit() and in createSector(), causing many bugs near the world edge. First revert the previous implementation. Rename blockpos_over_limit() to blockpos_over_max_limit() for clarity. Add a new function to mapblock.h called blockpos_over_mapgen_limit() that checks against the map_generation_limit setting, and call this only from the code that decides where mapgen stops. Use MAX_MAP_GENERATION_LIMIT in objectpos_over_limit() to reduce the chance of bugs, there is no need to use map_generation_limit here.
*	avoid crashing when accessing mapgen early (#5384)	zeuner	2017-03-17
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*	[CSM] Client side modding	Loic Blot	2017-03-13
\| \| \| \| \| \| \| \| \| \|	* rename GameScripting to ServerScripting * Make getBuiltinLuaPath static serverside * Add on_shutdown callback * Add on_receiving_chat_message & on_sending_chat_message callbacks * ScriptApiBase: use IGameDef instead of Server This permits to share common attribute between client & server * Enable mod security in client side modding without conditions
*	Added lua tracebacks to some errors where you have been blind to what… (#5043)	sapier	2017-01-15
\| \| \| \|	* Added lua tracebacks to some errors where you have been blind to what actually went wrong
*	Environment & IGameDef code refactoring (#4985)	Ner'zhul	2017-01-09
\| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \|	* Environment code refactoring * Cleanup includes & class declarations in client & server environment to improve build speed * ServerEnvironment::m_gamedef is now a pointer to Server instead of IGameDef, permitting to cleanup many casts. * Cleanup IGameDef * Move ITextureSource* IGameDef::getTextureSource() to Client only. * Also move ITextureSource IGameDef::tsrc() helper drop getShaderSource, getSceneManager, getSoundManager & getCamera abstract call * drop unused emerge() call * cleanup server unused functions (mentionned before) * Drop one unused parameter from ContentFeatures::updateTextures * move checkLocalPrivilege to Client * Remove some unnecessary casts * create_formspec_menu: remove IWritableTextureSource pointer, as client already knows it * Fix some comments * Change required IGameDef to Server/Client pointers * Previous change that game.cpp sometimes calls functions with Client + InventoryManager + IGameDef in same functions but it's the same objects * Remove duplicate Client pointer in GUIFormSpecMenu::GUIFormSpecMenu * drop ClientMap::sectorWasDrawn which is unused
*	Fix unnecessary block loading (#4847)	Dániel Juhász	2016-12-18
\| \| \| \|	This commit makes the game load blocks only if they are not in the memory.
*	Replace various std::map with UNORDERED_MAP + various cleanups	Loic Blot	2016-10-05
\| \| \| \| \| \| \| \| \| \| \| \|	This is part 2 for 5f084cd98d7b3326b51320455364337539710efd Other improvements: * Use the defined ItemGroupList when used * make Client::checkPrivilege const * inline some trivial functions * Add ActiveObjectMap typedef * Add SettingsEntries typedef
*	Add MapSettingsManager and new mapgen setting script API functions	kwolekr	2016-07-03
\| \| \| \| \| \| \| \| \| \| \| \| \| \| \|	This commit refactors the majority of the Mapgen settings system. - MapgenParams is now owned by MapSettingsManager, itself a part of ServerMap, instead of the EmergeManager. - New Script API functions added: core.get_mapgen_setting core.get_mapgen_setting_noiseparams, core.set_mapgen_setting, and core.set_mapgen_setting_noiseparams. - minetest.get/set_mapgen_params are deprecated by the above new functions. - It is now possible to view and modify any arbitrary mapgen setting from a mod, rather than the base MapgenParams structure. - MapgenSpecificParams has been removed.
*	Mapgen: Refactor mapgen creation and management	kwolekr	2016-07-03
\| \| \| \| \| \|	- Move mapgen creation logic out of EmergeManager and into Mapgen - Internally represent mapgen type as an enum value, instead of a string - Remove the need for a MapgenFactory per mapgen
*	Move biome calculation to BiomeGen	kwolekr	2016-05-27
\| \| \| \| \| \| \|	BiomeGen defines an interface that, given a set of BiomeParams, computes biomes for a given area using the algorithm implemented by that specific BiomeGen. This abstracts away the old system where each mapgen supplied the noises required for biome generation.
*	FindSpawnPos: Let mapgens decide what spawn altitude is suitable	paramat	2016-02-09
\| \| \| \| \| \| \| \| \| \| \| \|	To avoid spawn search failing in new specialised mapgens Increase spawn search range to 4000 nodes Add getSpawnLevelAtPoint() functions to EmergeManager, class Mapgen and all mapgens Remove getGroundLevelAtPoint() functions from all mapgens except mgv6 (possibly to be re-added later in the correct form to return actual ground level) Make mgvalleys flag names consistent with other mapgens Remove now unused 'vertical spawn range' setting
*	EmergeManager: Do not queue duplicate block requests	kwolekr	2016-01-19
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*	Add Valleys mapgen.	Duane Robertson	2016-01-14
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*	Mgflat: Set blank default spflags. Unhide	paramat	2016-01-10
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*	Mgfractal: Move julia set selection into formula parameter	paramat	2015-11-23
\| \| \| \| \| \|	Improve default parameters Update and improve documentation Unhide mapgen, but is still unstable
*	Mapgen: Add flat mapgen in hidden form	paramat	2015-11-11
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*	Refactor Thread class to improve readability and portability	kwolekr	2015-10-16
\| \| \| \| \| \| \| \| \|	- Fix some incompatibilities with obscure platforms (AIX and WinCE) - Clean up Thread class interface - Add m_ prefix to private member variables - Simplify platform-dependent logic, reducing preprocessor conditional clauses and improving readibility - Add Thread class documentation
*	Rename macros with two leading underscores	ShadowNinja	2015-10-14
\| \| \| \|	These names are reserved for the compiler/library implementations.
*	Always use errorstream for DEBUG_EXCEPTION_HANDLER	ShadowNinja	2015-10-14
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*	Mapgen: Add 4D fractal mapgen	paramat	2015-10-06
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*	Allow setting chunksize in core.set_mapgen_params	kwolekr	2015-10-04
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*	Hide mapgens from main menu not intended for end users	kwolekr	2015-10-04
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*	Add emerge completion callback mechanism	kwolekr	2015-10-04
\| \| \| \|	Major refactor of emerge.cpp and Map::init/finishBlockMake
*	Add /emergeblocks command and core.emerge_area() Lua API	kwolekr	2015-09-23
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*	Clean up threading	ShadowNinja	2015-08-23
\| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \|	* Rename everything. * Strip J prefix. * Change UpperCamelCase functions to lowerCamelCase. * Remove global (!) semaphore count mutex on OSX. * Remove semaphore count getter (unused, unsafe, depended on internal API functions on Windows, and used a hack on OSX). * Add `Atomic<type>`. * Make `Thread` handle thread names. * Add support for C++11 multi-threading. * Combine pthread and win32 sources. * Remove `ThreadStarted` (unused, unneeded). * Move some includes from the headers to the sources. * Move all of `Event` into its header (allows inlining with no new includes). * Make `Event` use `Semaphore` (except on Windows). * Move some porting functions into `Thread`. * Integrate logging with `Thread`. * Add threading test.
*	Prepend "Lua: " before lua exceptions	Břetislav Štec	2015-08-02
\| \| \| \| \|	src/server.cpp src/emerge.cpp
*	Revert the upper-case PROJECT_NAME nonsense that was part of #2402	sfan5	2015-04-27
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*	Move globals from main.cpp to more sane locations	Craig Robbins	2015-04-01
\| \| \| \| \| \| \| \| \| \| \| \|	Move debug streams to log.cpp\|h Move GUI-related globals to clientlauncher Move g_settings and g_settings_path to settings.cpp\|h Move g_menuclouds to clouds.cpp\|h Move g_profiler to profiler.cpp\|h
*	Clean up and tweak build system	ShadowNinja	2015-03-27
\| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \|	* Combine client and server man pages. * Update unit test options and available databases in man page. * Add `--worldname` to man page. * Fix a bunch of places where `"Minetest"` was used directly instead of `PROJECT_NAME`. * Disable server build by default on all operating systems. * Make `ENABLE_FREETYPE` not fail if FreeType isn't found. * Enable LevelDB, Redis, and FreeType detection by default. * Remove the `VERSION_PATCH_ORIG` hack. * Add option to search for and use system JSONCPP. * Remove broken LuaJIT version detection. * Rename `DISABLE_LUAJIT` to `ENABLE_LUAJIT`. * Rename `minetest_` variables in `version.{h,cpp}` to `g_`. * Clean up style of CMake files.
*	Respect game mapgen flags and save world noise params	ngosang	2015-03-07
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*	Fix map_seed not changed when creating a new world after login to another	fz72	2015-02-18
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*	Randomly generate seed if field blank for any Settings instance	kwolekr	2015-02-01
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*	Write common mapgen params to map_meta.txt on world initialization	kwolekr	2015-01-27
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*	Fix emerge thread not cleaning up emerge queue on shutdown	sapier	2015-01-07
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*	Fix some lingering code style issues	kwolekr	2014-12-29
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