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authorkwolekr <kwolekr@minetest.net>2016-06-14 00:10:55 -0400
committerkwolekr <kwolekr@minetest.net>2016-07-03 14:04:11 -0400
commit92705306bfb4994107a43514f29997cea15d48dc (patch)
treed1919cc2b5091ef6e31cdd312f5cd92ba058e76e /src/unittest/CMakeLists.txt
parent70e2c1c7d413d20757f571e3f1e02b05c95418f1 (diff)
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Mapgen: Refactor mapgen creation and management
- 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
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generated by cgit v1.2.3 (git 2.39.1) at 2024-11-09 16:30:43 +0000
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/*
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_game.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_abm.h"
#include "content_sao.h"
#include "mods.h"
#include "sound.h" // dummySoundManager
#include "event_manager.h"
#include "serverlist.h"
#include "util/string.h"
#include "util/mathconstants.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"

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("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
	):
	m_path_world(path_world),
	m_gamespec(gamespec),
	m_simple_singleplayer_mode(simple_singleplayer_mode),
	m_async_fatal_error(""),
	m_env(NULL),
	m_con(PROTOCOL_ID,
			512,
			CONNECTION_TIMEOUT,
			ipv6,
			this),
	m_banmanager(NULL),
	m_rollback(NULL),
	m_enable_rollback_recording(false),
	m_emerge(NULL),
	m_script(NULL),
	m_itemdef(createItemDefManager()),
	m_nodedef(createNodeDefManager()),
	m_craftdef(createCraftDefManager()),
	m_event(new EventManager()),
	m_thread(NULL),
	m_time_of_day_send_timer(0),
	m_uptime(0),
	m_clients(&m_con),
	m_shutdown_requested(false),
	m_shutdown_ask_reconnect(false),
	m_ignore_map_edit_events(false),
	m_ignore_map_edit_events_peer_id(0),
	m_next_sound_id(0)

{
	m_liquid_transform_timer = 0.0;
	m_liquid_transform_every = 1.0;
	m_print_info_timer = 0.0;
	m_masterserver_timer = 0.0;
	m_objectdata_timer = 0.0;
	m_emergethread_trigger_timer = 0.0;
	m_savemap_timer = 0.0;

	m_step_dtime = 0.0;
	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);

	ModConfiguration modconf(m_path_world);
	m_mods = modconf.getMods();
	std::vector<ModSpec> unsatisfied_mods = modconf.getUnsatisfiedMods();
	// complain about mods with unsatisfied dependencies
	if(!modconf.isConsistent()) {
		for(std::vector<ModSpec>::iterator it = unsatisfied_mods.begin();
			it != unsatisfied_mods.end(); ++it) {
			ModSpec mod = *it;
			errorstream << "mod \"" << mod.name << "\" has unsatisfied dependencies: ";
			for(std::set<std::string>::iterator dep_it = mod.unsatisfied_depends.begin();
				dep_it != mod.unsatisfied_depends.end(); ++dep_it)
				errorstream << " \"" << *dep_it << "\"";
			errorstream << std::endl;
		}
	}

	Settings worldmt_settings;
	std::string worldmt = m_path_world + DIR_DELIM + "world.mt";
	worldmt_settings.readConfigFile(worldmt.c_str());
	std::vector<std::string> names = worldmt_settings.getNames();
	std::set<std::string> load_mod_names;
	for(std::vector<std::string>::iterator it = names.begin();
		it != names.end(); ++it) {
		std::string name = *it;
		if(name.compare(0,9,"load_mod_")==0 && worldmt_settings.getBool(name))
			load_mod_names.insert(name.substr(9));
	}
	// complain about mods declared to be loaded, but not found
	for(std::vector<ModSpec>::iterator it = m_mods.begin();
			it != m_mods.end(); ++it)
		load_mod_names.erase((*it).name);
	for(std::vector<ModSpec>::iterator it = unsatisfied_mods.begin();
			it != unsatisfied_mods.end(); ++it)
		load_mod_names.erase((*it).name);
	if(!load_mod_names.empty()) {
		errorstream << "The following mods could not be found:";
		for(std::set<std::string>::iterator it = load_mod_names.begin();
			it != load_mod_names.end(); ++it)
			errorstream << " \"" << (*it) << "\"";
		errorstream << std::endl;
	}

	//lock environment
	MutexAutoLock envlock(m_env_mutex);

	// Load mapgen params from Settings
	m_emerge->loadMapgenParams();

	// 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 GameScripting(this);

	std::string script_path = getBuiltinLuaPath() + DIR_DELIM "init.lua";

	m_script->loadMod(script_path, BUILTIN_MOD_NAME);

	// Print mods
	infostream << "Server: Loading mods: ";
	for(std::vector<ModSpec>::iterator i = m_mods.begin();
			i != m_mods.end(); ++i) {
		const ModSpec &mod = *i;
		infostream << mod.name << " ";
	}
	infostream << std::endl;
	// Load and run "mod" scripts
	for (std::vector<ModSpec>::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 chararacters [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();

	// 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);

	// Initialize mapgens
	m_emerge->initMapgens();

	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();
	}

	// Add some test ActiveBlockModifiers to environment
	add_legacy_abms(m_env, m_nodedef);

	m_liquid_transform_every = g_settings->getFloat("liquid_update");
}

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

	// Send shutdown message
	SendChatMessage(PEER_ID_INEXISTENT, 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_env;

	// N.B. the EmergeManager should be deleted after the Environment since Map
	// depends on EmergeManager to write its current params to the map meta
	delete m_emerge;
	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(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);
	}

	/*
		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);
#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 ? "update" : "start",
					m_bind_addr.getPort(),
					m_clients.getPlayerNames(),
					m_uptime.get(),
					m_env->getGameTime(),
					m_lag,
					m_gamespec.id,
					m_emerge->params.mg_name,
					m_mods);
			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();
		std::map<u16, RemoteClient*> clients = m_clients.getClientList();
		ScopeProfiler sp(g_profiler, "Server: checking added and deleted objs");

		// Radius inside which objects are active
		s16 radius = g_settings->getS16("active_object_send_range_blocks");
		s16 player_radius = g_settings->getS16("player_transfer_distance");

		if (player_radius == 0 && g_settings->exists("unlimited_player_transfer_distance") &&
				!g_settings->getBool("unlimited_player_transfer_distance"))
			player_radius = radius;

		radius *= MAP_BLOCKSIZE;
		player_radius *= MAP_BLOCKSIZE;

		for (std::map<u16, RemoteClient*>::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;

			Player *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;
			}

			std::queue<u16> removed_objects;
			std::queue<u16> added_objects;
			m_env->getRemovedActiveObjects(player, radius, player_radius,
					client->m_known_objects, removed_objects);
			m_env->getAddedActiveObjects(player, 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();
	}

	/*
		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::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::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();
		std::map<u16, RemoteClient*> clients = m_clients.getClientList();
		// Route data to every client
		for (std::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::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::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;
		if(counter >= g_settings->getFloat("server_map_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();
		}
	}
}

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 =
		static_cast<RemotePlayer*>(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
	SendPlayerHPOrDie(playersao);

	// Send Breath
	SendPlayerBreath(peer_id);

	// Show death screen if necessary
	if(player->isDead())
		SendDeathscreen(peer_id, false, v3f(0,0,0));

	// Note things in chat if not in simple singleplayer mode
	if(!m_simple_singleplayer_mode) {
		// Send information about server to player in chat
		SendChatMessage(peer_id, getStatusString());

		// Send information about joining in chat
		{
			std::wstring name = L"unknown";
			Player *player = m_env->getPlayer(peer_id);
			if(player != NULL)
				name = narrow_to_wide(player->getName());

			std::wstring message;
			message += L"*** ";
			message += name;
			message += L" joined the game.";
			SendChatMessage(PEER_ID_INEXISTENT,message);
		}
	}
	Address addr = getPeerAddress(player->peer_id);
	std::string ip_str = addr.serializeString();
	actionstream<<player->getName() <<" [" << ip_str << "] joins game. " << std::endl;
	/*
		Print out action
	*/
	{
		std::vector<std::string> names = m_clients.getPlayerNames();

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

		for (std::vector<std::string>::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;
}

u32 Server::getTimeOfDay()
{
	return m_env->getTimeOfDay();
}

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:
	{
		Player *player = 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;

		Player *player = 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;