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[minetest.git] / src / server.cpp

/*
Minetest-c55
Copyright (C) 2010 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 General Public License as published by
the Free Software Foundation; either version 2 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 General Public License for more details.

You should have received a copy of the GNU 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 "utility.h"
#include <iostream>
#include "clientserver.h"
#include "map.h"
#include "jmutexautolock.h"
#include "main.h"
#include "constants.h"
#include "voxel.h"
#include "materials.h"
#include "mineral.h"

#define BLOCK_EMERGE_FLAG_FROMDISK (1<<0)

void * ServerThread::Thread()
{
        ThreadStarted();

        DSTACK(__FUNCTION_NAME);

        BEGIN_DEBUG_EXCEPTION_HANDLER

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

                        {
                                //TimeTaker timer("AsyncRunStep()");
                                m_server->AsyncRunStep();
                        }
                
                        //dout_server<<"Running m_server->Receive()"<<std::endl;
                        m_server->Receive();
                }
                catch(con::NoIncomingDataException &e)
                {
                }
                catch(con::PeerNotFoundException &e)
                {
                        dout_server<<"Server: PeerNotFoundException"<<std::endl;
                }
        }
        
        END_DEBUG_EXCEPTION_HANDLER

        return NULL;
}

void * EmergeThread::Thread()
{
        ThreadStarted();

        DSTACK(__FUNCTION_NAME);

        bool debug=false;
        
        BEGIN_DEBUG_EXCEPTION_HANDLER

        /*
                Get block info from queue, emerge them and send them
                to clients.

                After queue is empty, exit.
        */
        while(getRun())
        {
                QueuedBlockEmerge *qptr = m_server->m_emerge_queue.pop();
                if(qptr == NULL)
                        break;
                
                SharedPtr<QueuedBlockEmerge> q(qptr);

                v3s16 &p = q->pos;
                
                //derr_server<<"EmergeThread::Thread(): running"<<std::endl;

                //TimeTaker timer("block emerge");
                
                /*
                        Try to emerge it from somewhere.

                        If it is only wanted as optional, only loading from disk
                        will be allowed.
                */
                
                /*
                        Check if any peer wants it as non-optional. In that case it
                        will be generated.

                        Also decrement the emerge queue count in clients.
                */

                bool optional = true;

                {
                        core::map<u16, u8>::Iterator i;
                        for(i=q->peer_ids.getIterator(); i.atEnd()==false; i++)
                        {
                                //u16 peer_id = i.getNode()->getKey();

                                // Check flags
                                u8 flags = i.getNode()->getValue();
                                if((flags & BLOCK_EMERGE_FLAG_FROMDISK) == false)
                                        optional = false;
                                
                        }
                }

                /*dstream<<"EmergeThread: p="
                                <<"("<<p.X<<","<<p.Y<<","<<p.Z<<") "
                                <<"optional="<<optional<<std::endl;*/
                
                ServerMap &map = ((ServerMap&)m_server->m_env.getMap());
                        
                core::map<v3s16, MapBlock*> changed_blocks;
                core::map<v3s16, MapBlock*> lighting_invalidated_blocks;

                MapBlock *block = NULL;
                bool got_block = true;
                core::map<v3s16, MapBlock*> modified_blocks;
                
                {//envlock

                //TimeTaker envlockwaittimer("block emerge envlock wait time");
                
                // 0-50ms
                JMutexAutoLock envlock(m_server->m_env_mutex);

                //envlockwaittimer.stop();

                //TimeTaker timer("block emerge (while env locked)");
                        
                try{
                        bool only_from_disk = false;
                        
                        if(optional)
                                only_from_disk = true;
                        
                        // First check if the block already exists
                        //block = map.getBlockNoCreate(p);

                        if(block == NULL)
                        {
                                //dstream<<"Calling emergeBlock"<<std::endl;
                                block = map.emergeBlock(
                                                p,
                                                only_from_disk,
                                                changed_blocks,
                                                lighting_invalidated_blocks);

#if 0
                                /*
                                        While we're at it, generate some other blocks too
                                */
                                try
                                {
                                        map.emergeBlock(
                                                        p+v3s16(0,1,0),
                                                        only_from_disk,
                                                        changed_blocks,
                                                        lighting_invalidated_blocks);
                                        map.emergeBlock(
                                                        p+v3s16(0,-1,0),
                                                        only_from_disk,
                                                        changed_blocks,
                                                        lighting_invalidated_blocks);
                                }
                                catch(InvalidPositionException &e)
                                {
                                }
#endif
                        }

                        // If it is a dummy, block was not found on disk
                        if(block->isDummy())
                        {
                                //dstream<<"EmergeThread: Got a dummy block"<<std::endl;
                                got_block = false;

                                if(only_from_disk == false)
                                {
                                        dstream<<"EmergeThread: wanted to generate a block but got a dummy"<<std::endl;
                                        assert(0);
                                }
                        }
                }
                catch(InvalidPositionException &e)
                {
                        // Block not found.
                        // This happens when position is over limit.
                        got_block = false;
                }
                
                if(got_block)
                {
                        if(debug && changed_blocks.size() > 0)
                        {
                                dout_server<<DTIME<<"Got changed_blocks: ";
                                for(core::map<v3s16, MapBlock*>::Iterator i = changed_blocks.getIterator();
                                                i.atEnd() == false; i++)
                                {
                                        MapBlock *block = i.getNode()->getValue();
                                        v3s16 p = block->getPos();
                                        dout_server<<"("<<p.X<<","<<p.Y<<","<<p.Z<<") ";
                                }
                                dout_server<<std::endl;
                        }

                        /*
                                Collect a list of blocks that have been modified in
                                addition to the fetched one.
                        */
                        
                        if(lighting_invalidated_blocks.size() > 0)
                        {
                                /*dstream<<"lighting "<<lighting_invalidated_blocks.size()
                                                <<" blocks"<<std::endl;*/
                        
                                // 50-100ms for single block generation
                                //TimeTaker timer("** EmergeThread updateLighting");
                                
                                // Update lighting without locking the environment mutex,
                                // add modified blocks to changed blocks
                                map.updateLighting(lighting_invalidated_blocks, modified_blocks);
                        }
                                
                        // Add all from changed_blocks to modified_blocks
                        for(core::map<v3s16, MapBlock*>::Iterator i = changed_blocks.getIterator();
                                        i.atEnd() == false; i++)
                        {
                                MapBlock *block = i.getNode()->getValue();
                                modified_blocks.insert(block->getPos(), block);
                        }
                }
                // If we got no block, there should be no invalidated blocks
                else
                {
                        assert(lighting_invalidated_blocks.size() == 0);
                }

                }//envlock

                /*
                        Set sent status of modified blocks on clients
                */
        
                // NOTE: Server's clients are also behind the connection mutex
                JMutexAutoLock lock(m_server->m_con_mutex);

                /*
                        Add the originally fetched block to the modified list
                */
                if(got_block)
                {
                        modified_blocks.insert(p, block);
                }
                
                /*
                        Set the modified blocks unsent for all the clients
                */
                
                for(core::map<u16, RemoteClient*>::Iterator
                                i = m_server->m_clients.getIterator();
                                i.atEnd() == false; i++)
                {
                        RemoteClient *client = i.getNode()->getValue();
                        
                        if(modified_blocks.size() > 0)
                        {
                                // Remove block from sent history
                                client->SetBlocksNotSent(modified_blocks);
                        }
                }
                
        }

        END_DEBUG_EXCEPTION_HANDLER

        return NULL;
}

void RemoteClient::GetNextBlocks(Server *server, float dtime,
                core::array<PrioritySortedBlockTransfer> &dest)
{
        DSTACK(__FUNCTION_NAME);
        
        // Increment timers
        m_nearest_unsent_reset_timer += dtime;

        // Won't send anything if already sending
        if(m_blocks_sending.size() >= g_settings.getU16
                        ("max_simultaneous_block_sends_per_client"))
        {
                //dstream<<"Not sending any blocks, Queue full."<<std::endl;
                return;
        }

        Player *player = server->m_env.getPlayer(peer_id);

        assert(player != NULL);

        v3f playerpos = player->getPosition();
        v3f playerspeed = player->getSpeed();

        v3s16 center_nodepos = floatToInt(playerpos, BS);

        v3s16 center = getNodeBlockPos(center_nodepos);
        
        // Camera position and direction
        v3f camera_pos =
                        playerpos + v3f(0, BS+BS/2, 0);
        v3f camera_dir = v3f(0,0,1);
        camera_dir.rotateYZBy(player->getPitch());
        camera_dir.rotateXZBy(player->getYaw());

        /*
                Get the starting value of the block finder radius.
        */
        s16 last_nearest_unsent_d;
        s16 d_start;
                
        if(m_last_center != center)
        {
                m_nearest_unsent_d = 0;
                m_last_center = center;
        }

        /*dstream<<"m_nearest_unsent_reset_timer="
                        <<m_nearest_unsent_reset_timer<<std::endl;*/
        if(m_nearest_unsent_reset_timer > 5.0)
        {
                m_nearest_unsent_reset_timer = 0;
                m_nearest_unsent_d = 0;
                //dstream<<"Resetting m_nearest_unsent_d"<<std::endl;
        }

        last_nearest_unsent_d = m_nearest_unsent_d;
        
        d_start = m_nearest_unsent_d;

        u16 maximum_simultaneous_block_sends_setting = g_settings.getU16
                        ("max_simultaneous_block_sends_per_client");
        u16 maximum_simultaneous_block_sends = 
                        maximum_simultaneous_block_sends_setting;

        /*
                Check the time from last addNode/removeNode.
                
                Decrease send rate if player is building stuff.
        */
        m_time_from_building += dtime;
        if(m_time_from_building < g_settings.getFloat(
                                "full_block_send_enable_min_time_from_building"))
        {
                maximum_simultaneous_block_sends
                        = LIMITED_MAX_SIMULTANEOUS_BLOCK_SENDS;
        }
        
        u32 num_blocks_selected = m_blocks_sending.size();
        
        /*
                next time d will be continued from the d from which the nearest
                unsent block was found this time.

                This is because not necessarily any of the blocks found this
                time are actually sent.
        */
        s32 new_nearest_unsent_d = -1;

        s16 d_max = g_settings.getS16("max_block_send_distance");
        s16 d_max_gen = g_settings.getS16("max_block_generate_distance");
        
        //dstream<<"Starting from "<<d_start<<std::endl;

        for(s16 d = d_start; d <= d_max; d++)
        {
                //dstream<<"RemoteClient::SendBlocks(): d="<<d<<std::endl;
                
                /*
                        If m_nearest_unsent_d was changed by the EmergeThread
                        (it can change it to 0 through SetBlockNotSent),
                        update our d to it.
                        Else update m_nearest_unsent_d
                */
                if(m_nearest_unsent_d != last_nearest_unsent_d)
                {
                        d = m_nearest_unsent_d;
                        last_nearest_unsent_d = m_nearest_unsent_d;
                }

                /*
                        Get the border/face dot coordinates of a "d-radiused"
                        box
                */
                core::list<v3s16> list;
                getFacePositions(list, d);
                
                core::list<v3s16>::Iterator li;
                for(li=list.begin(); li!=list.end(); li++)
                {
                        v3s16 p = *li + center;
                        
                        /*
                                Send throttling
                                - Don't allow too many simultaneous transfers
                                - EXCEPT when the blocks are very close

                                Also, don't send blocks that are already flying.
                        */
                        
                        u16 maximum_simultaneous_block_sends_now =
                                        maximum_simultaneous_block_sends;
                        
                        if(d <= BLOCK_SEND_DISABLE_LIMITS_MAX_D)
                        {
                                maximum_simultaneous_block_sends_now =
                                                maximum_simultaneous_block_sends_setting;
                        }

                        // Limit is dynamically lowered when building
                        if(num_blocks_selected
                                        >= maximum_simultaneous_block_sends_now)
                        {
                                /*dstream<<"Not sending more blocks. Queue full. "
                                                <<m_blocks_sending.size()
                                                <<std::endl;*/
                                goto queue_full;
                        }

                        if(m_blocks_sending.find(p) != NULL)
                                continue;
                
                        /*
                                Do not go over-limit
                        */
                        if(p.X < -MAP_GENERATION_LIMIT / MAP_BLOCKSIZE
                        || p.X > MAP_GENERATION_LIMIT / MAP_BLOCKSIZE
                        || p.Y < -MAP_GENERATION_LIMIT / MAP_BLOCKSIZE
                        || p.Y > MAP_GENERATION_LIMIT / MAP_BLOCKSIZE
                        || p.Z < -MAP_GENERATION_LIMIT / MAP_BLOCKSIZE
                        || p.Z > MAP_GENERATION_LIMIT / MAP_BLOCKSIZE)
                                continue;
                
                        // If this is true, inexistent block will be made from scratch
                        bool generate = d <= d_max_gen;
                        
                        {
                                /*// Limit the generating area vertically to 2/3
                                if(abs(p.Y - center.Y) > d_max_gen - d_max_gen / 3)
                                        generate = false;*/

                                // Limit the send area vertically to 2/3
                                if(abs(p.Y - center.Y) > d_max_gen - d_max_gen / 3)
                                        continue;
                        }

#if 0
                        /*
                                If block is far away, don't generate it unless it is
                                near ground level

                                NOTE: We can't know the ground level this way with the
                                new generator.
                        */
                        if(d > 4)
                        {
                                v2s16 p2d(p.X, p.Z);
                                MapSector *sector = NULL;
                                try
                                {
                                        sector = server->m_env.getMap().getSectorNoGenerate(p2d);
                                }
                                catch(InvalidPositionException &e)
                                {
                                }

                                if(sector != NULL)
                                {
                                        // Get center ground height in nodes
                                        f32 gh = sector->getGroundHeight(
                                                        v2s16(MAP_BLOCKSIZE/2, MAP_BLOCKSIZE/2));
                                        // Block center y in nodes
                                        f32 y = (f32)(p.Y * MAP_BLOCKSIZE + MAP_BLOCKSIZE/2);
                                        // If differs a lot, don't generate
                                        if(fabs(gh - y) > MAP_BLOCKSIZE*2)
                                                generate = false;
                                }
                        }
#endif

                        /*
                                Don't generate or send if not in sight
                        */

                        if(isBlockInSight(p, camera_pos, camera_dir, 10000*BS) == false)
                        {
                                continue;
                        }
                        
                        /*
                                Don't send already sent blocks
                        */
                        {
                                if(m_blocks_sent.find(p) != NULL)
                                        continue;
                        }

                        /*
                                Check if map has this block
                        */
                        MapBlock *block = server->m_env.getMap().getBlockNoCreateNoEx(p);
                        
                        bool surely_not_found_on_disk = false;
                        bool block_is_invalid = false;
                        if(block != NULL)
                        {
                                if(block->isDummy())
                                {
                                        surely_not_found_on_disk = true;
                                }

                                if(block->isValid() == false)
                                {
                                        block_is_invalid = true;
                                }
                                
                                /*if(block->isFullyGenerated() == false)
                                {
                                        block_is_invalid = true;
                                }*/
                                
                                v2s16 p2d(p.X, p.Z);
                                ServerMap *map = (ServerMap*)(&server->m_env.getMap());
                                v2s16 chunkpos = map->sector_to_chunk(p2d);
                                if(map->chunkNonVolatile(chunkpos) == false)
                                        block_is_invalid = true;
                        }

                        /*
                                If block has been marked to not exist on disk (dummy)
                                and generating new ones is not wanted, skip block.
                        */
                        if(generate == false && surely_not_found_on_disk == true)
                        {
                                // get next one.
                                continue;
                        }

                        /*
                                Record the lowest d from which a a block has been
                                found being not sent and possibly to exist
                        */
                        if(new_nearest_unsent_d == -1 || d < new_nearest_unsent_d)
                        {
                                new_nearest_unsent_d = d;
                        }
                                        
                        /*
                                Add inexistent block to emerge queue.
                        */
                        if(block == NULL || surely_not_found_on_disk || block_is_invalid)
                        {
                                //TODO: Get value from somewhere
                                // Allow only one block in emerge queue
                                //if(server->m_emerge_queue.peerItemCount(peer_id) < 1)
                                if(server->m_emerge_queue.peerItemCount(peer_id) < 2)
                                {
                                        //dstream<<"Adding block to emerge queue"<<std::endl;
                                        
                                        // Add it to the emerge queue and trigger the thread
                                        
                                        u8 flags = 0;
                                        if(generate == false)
                                                flags |= BLOCK_EMERGE_FLAG_FROMDISK;
                                        
                                        server->m_emerge_queue.addBlock(peer_id, p, flags);
                                        server->m_emergethread.trigger();
                                }
                                
                                // get next one.
                                continue;
                        }

                        /*
                                Add block to send queue
                        */

                        PrioritySortedBlockTransfer q((float)d, p, peer_id);

                        dest.push_back(q);

                        num_blocks_selected += 1;
                }
        }
queue_full:

        if(new_nearest_unsent_d != -1)
        {
                m_nearest_unsent_d = new_nearest_unsent_d;
        }
}

void RemoteClient::SendObjectData(
                Server *server,
                float dtime,
                core::map<v3s16, bool> &stepped_blocks
        )
{
        DSTACK(__FUNCTION_NAME);

        // Can't send anything without knowing version
        if(serialization_version == SER_FMT_VER_INVALID)
        {
                dstream<<"RemoteClient::SendObjectData(): Not sending, no version."
                                <<std::endl;
                return;
        }

        /*
                Send a TOCLIENT_OBJECTDATA packet.
                Sent as unreliable.

                u16 command
                u16 number of player positions
                for each player:
                        v3s32 position*100
                        v3s32 speed*100
                        s32 pitch*100
                        s32 yaw*100
                u16 count of blocks
                for each block:
                        block objects
        */

        std::ostringstream os(std::ios_base::binary);
        u8 buf[12];
        
        // Write command
        writeU16(buf, TOCLIENT_OBJECTDATA);
        os.write((char*)buf, 2);
        
        /*
                Get and write player data
        */
        
        // Get connected players
        core::list<Player*> players = server->m_env.getPlayers(true);

        // Write player count
        u16 playercount = players.size();
        writeU16(buf, playercount);
        os.write((char*)buf, 2);

        core::list<Player*>::Iterator i;
        for(i = players.begin();
                        i != players.end(); i++)
        {
                Player *player = *i;

                v3f pf = player->getPosition();
                v3f sf = player->getSpeed();

                v3s32 position_i(pf.X*100, pf.Y*100, pf.Z*100);
                v3s32 speed_i   (sf.X*100, sf.Y*100, sf.Z*100);
                s32   pitch_i   (player->getPitch() * 100);
                s32   yaw_i     (player->getYaw() * 100);
                
                writeU16(buf, player->peer_id);
                os.write((char*)buf, 2);
                writeV3S32(buf, position_i);
                os.write((char*)buf, 12);
                writeV3S32(buf, speed_i);
                os.write((char*)buf, 12);
                writeS32(buf, pitch_i);
                os.write((char*)buf, 4);
                writeS32(buf, yaw_i);
                os.write((char*)buf, 4);
        }
        
        /*
                Get and write object data
        */

        /*
                Get nearby blocks.
                
                For making players to be able to build to their nearby
                environment (building is not possible on blocks that are not
                in memory):
                - Set blocks changed
                - Add blocks to emerge queue if they are not found

                SUGGESTION: These could be ignored from the backside of the player
        */

        Player *player = server->m_env.getPlayer(peer_id);

        assert(player);

        v3f playerpos = player->getPosition();
        v3f playerspeed = player->getSpeed();

        v3s16 center_nodepos = floatToInt(playerpos, BS);
        v3s16 center = getNodeBlockPos(center_nodepos);

        s16 d_max = g_settings.getS16("active_object_range");
        
        // Number of blocks whose objects were written to bos
        u16 blockcount = 0;

        std::ostringstream bos(std::ios_base::binary);

        for(s16 d = 0; d <= d_max; d++)
        {
                core::list<v3s16> list;
                getFacePositions(list, d);
                
                core::list<v3s16>::Iterator li;
                for(li=list.begin(); li!=list.end(); li++)
                {
                        v3s16 p = *li + center;

                        /*
                                Ignore blocks that haven't been sent to the client
                        */
                        {
                                if(m_blocks_sent.find(p) == NULL)
                                        continue;
                        }
                        
                        // Try stepping block and add it to a send queue
                        try
                        {

                        // Get block
                        MapBlock *block = server->m_env.getMap().getBlockNoCreate(p);

                        /*
                                Step block if not in stepped_blocks and add to stepped_blocks.
                        */
                        if(stepped_blocks.find(p) == NULL)
                        {
                                block->stepObjects(dtime, true, server->getDayNightRatio());
                                stepped_blocks.insert(p, true);
                                block->setChangedFlag();
                        }

                        // Skip block if there are no objects
                        if(block->getObjectCount() == 0)
                                continue;
                        
                        /*
                                Write objects
                        */

                        // Write blockpos
                        writeV3S16(buf, p);
                        bos.write((char*)buf, 6);

                        // Write objects
                        block->serializeObjects(bos, serialization_version);

                        blockcount++;

                        /*
                                Stop collecting objects if data is already too big
                        */
                        // Sum of player and object data sizes
                        s32 sum = (s32)os.tellp() + 2 + (s32)bos.tellp();
                        // break out if data too big
                        if(sum > MAX_OBJECTDATA_SIZE)
                        {
                                goto skip_subsequent;
                        }
                        
                        } //try
                        catch(InvalidPositionException &e)
                        {
                                // Not in memory
                                // Add it to the emerge queue and trigger the thread.
                                // Fetch the block only if it is on disk.
                                
                                // Grab and increment counter
                                /*SharedPtr<JMutexAutoLock> lock
                                                (m_num_blocks_in_emerge_queue.getLock());
                                m_num_blocks_in_emerge_queue.m_value++;*/
                                
                                // Add to queue as an anonymous fetch from disk
                                u8 flags = BLOCK_EMERGE_FLAG_FROMDISK;
                                server->m_emerge_queue.addBlock(0, p, flags);
                                server->m_emergethread.trigger();
                        }
                }
        }

skip_subsequent:

        // Write block count
        writeU16(buf, blockcount);
        os.write((char*)buf, 2);

        // Write block objects
        os<<bos.str();

        /*
                Send data
        */
        
        //dstream<<"Server: Sending object data to "<<peer_id<<std::endl;

        // Make data buffer
        std::string s = os.str();
        SharedBuffer<u8> data((u8*)s.c_str(), s.size());
        // Send as unreliable
        server->m_con.Send(peer_id, 0, data, false);
}

void RemoteClient::GotBlock(v3s16 p)
{
        if(m_blocks_sending.find(p) != NULL)
                m_blocks_sending.remove(p);
        else
        {
                /*dstream<<"RemoteClient::GotBlock(): Didn't find in"
                                " m_blocks_sending"<<std::endl;*/
                m_excess_gotblocks++;
        }
        m_blocks_sent.insert(p, true);
}

void RemoteClient::SentBlock(v3s16 p)
{
        if(m_blocks_sending.find(p) == NULL)
                m_blocks_sending.insert(p, 0.0);
        else
                dstream<<"RemoteClient::SentBlock(): Sent block"
                                " already in m_blocks_sending"<<std::endl;
}

void RemoteClient::SetBlockNotSent(v3s16 p)
{
        m_nearest_unsent_d = 0;
        
        if(m_blocks_sending.find(p) != NULL)
                m_blocks_sending.remove(p);
        if(m_blocks_sent.find(p) != NULL)
                m_blocks_sent.remove(p);
}

void RemoteClient::SetBlocksNotSent(core::map<v3s16, MapBlock*> &blocks)
{
        m_nearest_unsent_d = 0;
        
        for(core::map<v3s16, MapBlock*>::Iterator
                        i = blocks.getIterator();
                        i.atEnd()==false; i++)
        {
                v3s16 p = i.getNode()->getKey();

                if(m_blocks_sending.find(p) != NULL)
                        m_blocks_sending.remove(p);
                if(m_blocks_sent.find(p) != NULL)
                        m_blocks_sent.remove(p);
        }
}

/*
        PlayerInfo
*/

PlayerInfo::PlayerInfo()
{
        name[0] = 0;
}

void PlayerInfo::PrintLine(std::ostream *s)
{
        (*s)<<id<<": ";
        (*s)<<"\""<<name<<"\" ("
                        <<(position.X/10)<<","<<(position.Y/10)
                        <<","<<(position.Z/10)<<") ";
        address.print(s);
        (*s)<<" avg_rtt="<<avg_rtt;
        (*s)<<std::endl;
}

u32 PIChecksum(core::list<PlayerInfo> &l)
{
        core::list<PlayerInfo>::Iterator i;
        u32 checksum = 1;
        u32 a = 10;
        for(i=l.begin(); i!=l.end(); i++)
        {
                checksum += a * (i->id+1);
                checksum ^= 0x435aafcd;
                a *= 10;
        }
        return checksum;
}

/*
        Server
*/

Server::Server(
                std::string mapsavedir
        ):
        m_env(new ServerMap(mapsavedir), this),
        m_con(PROTOCOL_ID, 512, CONNECTION_TIMEOUT, this),
        m_thread(this),
        m_emergethread(this),
        m_time_of_day(9000),
        m_time_counter(0),
        m_time_of_day_send_timer(0),
        m_uptime(0),
        m_mapsavedir(mapsavedir),
        m_shutdown_requested(false),
        m_ignore_map_edit_events(false),
        m_ignore_map_edit_events_peer_id(0)
{
        m_liquid_transform_timer = 0.0;
        m_print_info_timer = 0.0;
        m_objectdata_timer = 0.0;
        m_emergethread_trigger_timer = 0.0;
        m_savemap_timer = 0.0;
        
        m_env_mutex.Init();
        m_con_mutex.Init();
        m_step_dtime_mutex.Init();
        m_step_dtime = 0.0;

        m_env.getMap().addEventReceiver(this);

        // Load players
        m_env.deSerializePlayers(m_mapsavedir);
}

Server::~Server()
{
        /*
                Send shutdown message
        */
        {
                JMutexAutoLock conlock(m_con_mutex);
                
                std::wstring line = L"*** Server shutting down";

                /*
                        Send the message to clients
                */
                for(core::map<u16, RemoteClient*>::Iterator
                        i = m_clients.getIterator();
                        i.atEnd() == false; i++)
                {
                        // Get client and check that it is valid
                        RemoteClient *client = i.getNode()->getValue();
                        assert(client->peer_id == i.getNode()->getKey());
                        if(client->serialization_version == SER_FMT_VER_INVALID)
                                continue;

                        SendChatMessage(client->peer_id, line);
                }
        }

        /*
                Save players
        */
        m_env.serializePlayers(m_mapsavedir);
        
        /*
                Stop threads
        */
        stop();
        
        /*
                Delete clients
        */
        {
                JMutexAutoLock clientslock(m_con_mutex);

                for(core::map<u16, RemoteClient*>::Iterator
                        i = m_clients.getIterator();
                        i.atEnd() == false; i++)
                {
                        /*// Delete player
                        // NOTE: These are removed by env destructor
                        {
                                u16 peer_id = i.getNode()->getKey();
                                JMutexAutoLock envlock(m_env_mutex);
                                m_env.removePlayer(peer_id);
                        }*/
                        
                        // Delete client
                        delete i.getNode()->getValue();
                }
        }
}

void Server::start(unsigned short port)
{
        DSTACK(__FUNCTION_NAME);
        // Stop thread if already running
        m_thread.stop();
        
        // Initialize connection
        m_con.setTimeoutMs(30);
        m_con.Serve(port);

        // Start thread
        m_thread.setRun(true);
        m_thread.Start();
        
        dout_server<<"Server: Started on port "<<port<<std::endl;
}

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

        // Stop threads (set run=false first so both start stopping)
        m_thread.setRun(false);
        m_emergethread.setRun(false);
        m_thread.stop();
        m_emergethread.stop();
        
        dout_server<<"Server: Threads stopped"<<std::endl;

        dout_server<<"Server: Saving players"<<std::endl;
        // Save players
        // FIXME: Apparently this does not do anything here
        //m_env.serializePlayers(m_mapsavedir);
}

void Server::step(float dtime)
{
        DSTACK(__FUNCTION_NAME);
        // Limit a bit
        if(dtime > 2.0)
                dtime = 2.0;
        {
                JMutexAutoLock lock(m_step_dtime_mutex);
                m_step_dtime += dtime;
        }
}

void Server::AsyncRunStep()
{
        DSTACK(__FUNCTION_NAME);
        
        float dtime;
        {
                JMutexAutoLock lock1(m_step_dtime_mutex);
                dtime = m_step_dtime;
        }
        
        // Send blocks to clients
        SendBlocks(dtime);
        
        if(dtime < 0.001)
                return;
        
        //dstream<<"Server steps "<<dtime<<std::endl;
        //dstream<<"Server::AsyncRunStep(): dtime="<<dtime<<std::endl;
        
        {
                JMutexAutoLock lock1(m_step_dtime_mutex);
                m_step_dtime -= dtime;
        }

        /*
                Update uptime
        */
        {
                m_uptime.set(m_uptime.get() + dtime);
        }
        
        /*
                Update m_time_of_day
        */
        {
                m_time_counter += dtime;
                f32 speed = g_settings.getFloat("time_speed") * 24000./(24.*3600);
                u32 units = (u32)(m_time_counter*speed);
                m_time_counter -= (f32)units / speed;
                m_time_of_day.set((m_time_of_day.get() + units) % 24000);
                
                //dstream<<"Server: m_time_of_day = "<<m_time_of_day.get()<<std::endl;

                /*
                        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");

                        //JMutexAutoLock envlock(m_env_mutex);
                        JMutexAutoLock conlock(m_con_mutex);

                        for(core::map<u16, RemoteClient*>::Iterator
                                i = m_clients.getIterator();
                                i.atEnd() == false; i++)
                        {
                                RemoteClient *client = i.getNode()->getValue();
                                //Player *player = m_env.getPlayer(client->peer_id);
                                
                                SharedBuffer<u8> data = makePacket_TOCLIENT_TIME_OF_DAY(
                                                m_time_of_day.get());
                                // Send as reliable
                                m_con.Send(client->peer_id, 0, data, true);
                        }
                }
        }

        {
                // Process connection's timeouts
                JMutexAutoLock lock2(m_con_mutex);
                m_con.RunTimeouts(dtime);
        }
        
        {
                // This has to be called so that the client list gets synced
                // with the peer list of the connection
                handlePeerChanges();
        }

        {
                // Step environment
                // This also runs Map's timers
                JMutexAutoLock lock(m_env_mutex);
                m_env.step(dtime);
        }
        
        /*
                Do background stuff
        */
        
        /*
                Transform liquids
        */
        m_liquid_transform_timer += dtime;
        if(m_liquid_transform_timer >= 1.00)
        {
                m_liquid_transform_timer -= 1.00;
                
                JMutexAutoLock lock(m_env_mutex);
                
                core::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
                */
                
                JMutexAutoLock lock2(m_con_mutex);

                for(core::map<u16, RemoteClient*>::Iterator
                                i = m_clients.getIterator();
                                i.atEnd() == false; i++)
                {
                        RemoteClient *client = i.getNode()->getValue();
                        
                        if(modified_blocks.size() > 0)
                        {
                                // Remove block from sent history
                                client->SetBlocksNotSent(modified_blocks);
                        }
                }
        }

        // Periodically print some info
        {
                float &counter = m_print_info_timer;
                counter += dtime;
                if(counter >= 30.0)
                {
                        counter = 0.0;

                        JMutexAutoLock lock2(m_con_mutex);

                        for(core::map<u16, RemoteClient*>::Iterator
                                i = m_clients.getIterator();
                                i.atEnd() == false; i++)
                        {
                                //u16 peer_id = i.getNode()->getKey();
                                RemoteClient *client = i.getNode()->getValue();
                                Player *player = m_env.getPlayer(client->peer_id);
                                std::cout<<player->getName()<<" ";
                                client->PrintInfo(std::cout);
                        }
                }
        }

        if(g_settings.getBool("enable_experimental"))
        {

        /*
                Check added and deleted active objects
        */
        {
                JMutexAutoLock envlock(m_env_mutex);
                JMutexAutoLock conlock(m_con_mutex);
                
                // Radius inside which objects are active
                s16 radius = 32;

                for(core::map<u16, RemoteClient*>::Iterator
                        i = m_clients.getIterator();
                        i.atEnd() == false; i++)
                {
                        RemoteClient *client = i.getNode()->getValue();
                        Player *player = m_env.getPlayer(client->peer_id);
                        if(player==NULL)
                                continue;
                        v3s16 pos = floatToInt(player->getPosition(), BS);

                        core::map<u16, bool> removed_objects;
                        core::map<u16, bool> added_objects;
                        m_env.getRemovedActiveObjects(pos, radius,
                                        client->m_known_objects, removed_objects);
                        m_env.getAddedActiveObjects(pos, radius,
                                        client->m_known_objects, added_objects);
                        
                        // Ignore if nothing happened
                        if(removed_objects.size() == 0 && added_objects.size() == 0)
                                continue;
                        
                        std::string data_buffer;

                        char buf[4];
                        
                        // Handle removed objects
                        writeU16((u8*)buf, removed_objects.size());
                        data_buffer.append(buf, 2);
                        for(core::map<u16, bool>::Iterator
                                        i = removed_objects.getIterator();
                                        i.atEnd()==false; i++)
                        {
                                // Get object
                                u16 id = i.getNode()->getKey();
                                ServerActiveObject* obj = m_env.getActiveObject(id);

                                // Add to data buffer for sending
                                writeU16((u8*)buf, i.getNode()->getKey());
                                data_buffer.append(buf, 2);
                                
                                // Remove from known objects
                                client->m_known_objects.remove(i.getNode()->getKey());

                                if(obj && obj->m_known_by_count > 0)
                                        obj->m_known_by_count--;
                        }

                        // Handle added objects
                        writeU16((u8*)buf, added_objects.size());
                        data_buffer.append(buf, 2);
                        for(core::map<u16, bool>::Iterator
                                        i = added_objects.getIterator();
                                        i.atEnd()==false; i++)
                        {
                                // Get object
                                u16 id = i.getNode()->getKey();
                                ServerActiveObject* obj = m_env.getActiveObject(id);
                                
                                // Get object type
                                u8 type = ACTIVEOBJECT_TYPE_INVALID;
                                if(obj == NULL)
                                        dstream<<"WARNING: "<<__FUNCTION_NAME
                                                        <<": NULL object"<<std::endl;
                                else
                                        type = obj->getType();

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

                                data_buffer.append(serializeLongString(
                                                obj->getClientInitializationData()));

                                // Add to known objects
                                client->m_known_objects.insert(i.getNode()->getKey(), false);

                                if(obj)
                                        obj->m_known_by_count++;
                        }

                        // Send packet
                        SharedBuffer<u8> reply(2 + data_buffer.size());
                        writeU16(&reply[0], TOCLIENT_ACTIVE_OBJECT_REMOVE_ADD);
                        memcpy((char*)&reply[2], data_buffer.c_str(),
                                        data_buffer.size());
                        // Send as reliable
                        m_con.Send(client->peer_id, 0, reply, true);

                        dstream<<"INFO: Server: Sent object remove/add: "
                                        <<removed_objects.size()<<" removed, "
                                        <<added_objects.size()<<" added, "
                                        <<"packet size is "<<reply.getSize()<<std::endl;
                }
        }

        /*
                Send object messages
        */
        {
                JMutexAutoLock envlock(m_env_mutex);
                JMutexAutoLock conlock(m_con_mutex);

                // Key = object id
                // Value = data sent by object
                core::map<u16, core::list<ActiveObjectMessage>* > buffered_messages;

                // Get active object messages from environment
                for(;;)
                {
                        ActiveObjectMessage aom = m_env.getActiveObjectMessage();
                        if(aom.id == 0)
                                break;
                        
                        core::list<ActiveObjectMessage>* message_list = NULL;
                        core::map<u16, core::list<ActiveObjectMessage>* >::Node *n;
                        n = buffered_messages.find(aom.id);
                        if(n == NULL)
                        {
                                message_list = new core::list<ActiveObjectMessage>;
                                buffered_messages.insert(aom.id, message_list);
                        }
                        else
                        {
                                message_list = n->getValue();
                        }
                        message_list->push_back(aom);
                }
                
                // Route data to every client
                for(core::map<u16, RemoteClient*>::Iterator
                        i = m_clients.getIterator();
                        i.atEnd()==false; i++)
                {
                        RemoteClient *client = i.getNode()->getValue();
                        std::string reliable_data;
                        std::string unreliable_data;
                        // Go through all objects in message buffer
                        for(core::map<u16, core::list<ActiveObjectMessage>* >::Iterator
                                        j = buffered_messages.getIterator();
                                        j.atEnd()==false; j++)
                        {
                                // If object is not known by client, skip it
                                u16 id = j.getNode()->getKey();
                                if(client->m_known_objects.find(id) == NULL)
                                        continue;
                                // Get message list of object
                                core::list<ActiveObjectMessage>* list = j.getNode()->getValue();
                                // Go through every message
                                for(core::list<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)
                        {
                                SharedBuffer<u8> reply(2 + reliable_data.size());
                                writeU16(&reply[0], TOCLIENT_ACTIVE_OBJECT_MESSAGES);
                                memcpy((char*)&reply[2], reliable_data.c_str(),
                                                reliable_data.size());
                                // Send as reliable
                                m_con.Send(client->peer_id, 0, reply, true);
                        }
                        if(unreliable_data.size() > 0)
                        {
                                SharedBuffer<u8> reply(2 + unreliable_data.size());
                                writeU16(&reply[0], TOCLIENT_ACTIVE_OBJECT_MESSAGES);
                                memcpy((char*)&reply[2], unreliable_data.c_str(),
                                                unreliable_data.size());
                                // Send as unreliable
                                m_con.Send(client->peer_id, 0, reply, false);
                        }

                        /*if(reliable_data.size() > 0 || unreliable_data.size() > 0)
                        {
                                dstream<<"INFO: Server: Size of object message data: "
                                                <<"reliable: "<<reliable_data.size()
                                                <<", unreliable: "<<unreliable_data.size()
                                                <<std::endl;
                        }*/
                }

                // Clear buffered_messages
                for(core::map<u16, core::list<ActiveObjectMessage>* >::Iterator
                                i = buffered_messages.getIterator();
                                i.atEnd()==false; i++)
                {
                        delete i.getNode()->getValue();
                }
        }

        } // enable_experimental

        /*
                Send queued-for-sending map edit events.
        */
        {
                while(m_unsent_map_edit_queue.size() != 0)
                {
                        MapEditEvent* event = m_unsent_map_edit_queue.pop_front();

                        if(event->type == MEET_ADDNODE)
                        {
                                dstream<<"Server: MEET_ADDNODE"<<std::endl;
                                sendAddNode(event->p, event->n, event->already_known_by_peer);
                        }
                        else if(event->type == MEET_REMOVENODE)
                        {
                                dstream<<"Server: MEET_REMOVENODE"<<std::endl;
                                sendRemoveNode(event->p, event->already_known_by_peer);
                        }
                        else if(event->type == MEET_OTHER)
                        {
                                dstream<<"WARNING: Server: MEET_OTHER not implemented"
                                                <<std::endl;
                        }
                        else
                        {
                                dstream<<"WARNING: Server: Unknown MapEditEvent "
                                                <<((u32)event->type)<<std::endl;
                        }

                        delete event;
                }
        }

        /*
                Send object positions
                TODO: Get rid of MapBlockObjects
        */
        {
                float &counter = m_objectdata_timer;
                counter += dtime;
                if(counter >= g_settings.getFloat("objectdata_interval"))
                {
                        JMutexAutoLock lock1(m_env_mutex);
                        JMutexAutoLock lock2(m_con_mutex);
                        SendObjectData(counter);

                        counter = 0.0;
                }
        }
        
        /*
                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_emergethread.trigger();
                }
        }

        // Save map
        {
                float &counter = m_savemap_timer;
                counter += dtime;
                if(counter >= g_settings.getFloat("server_map_save_interval"))
                {
                        counter = 0.0;

                        JMutexAutoLock lock(m_env_mutex);

                        if(((ServerMap*)(&m_env.getMap()))->isSavingEnabled() == true)
                        {
                                // Save only changed parts
                                m_env.getMap().save(true);

                                // Delete unused sectors
                                u32 deleted_count = m_env.getMap().deleteUnusedSectors(
                                                g_settings.getFloat("server_unload_unused_sectors_timeout"));
                                if(deleted_count > 0)
                                {
                                        dout_server<<"Server: Unloaded "<<deleted_count
                                                        <<" sectors from memory"<<std::endl;
                                }

                                // Save players
                                m_env.serializePlayers(m_mapsavedir);
                        }
                }
        }
}

void Server::Receive()
{
        DSTACK(__FUNCTION_NAME);
        u32 data_maxsize = 10000;
        Buffer<u8> data(data_maxsize);
        u16 peer_id;
        u32 datasize;
        try{
                {
                        JMutexAutoLock conlock(m_con_mutex);
                        datasize = m_con.Receive(peer_id, *data, data_maxsize);
                }

                // This has to be called so that the client list gets synced
                // with the peer list of the connection
                handlePeerChanges();

                ProcessData(*data, datasize, peer_id);
        }
        catch(con::InvalidIncomingDataException &e)
        {
                derr_server<<"Server::Receive(): "
                                "InvalidIncomingDataException: what()="
                                <<e.what()<<std::endl;
        }
        catch(con::PeerNotFoundException &e)
        {
                //NOTE: This is not needed anymore
                
                // The peer has been disconnected.
                // Find the associated player and remove it.

                /*JMutexAutoLock envlock(m_env_mutex);

                dout_server<<"ServerThread: peer_id="<<peer_id
                                <<" has apparently closed connection. "
                                <<"Removing player."<<std::endl;

                m_env.removePlayer(peer_id);*/
        }
}

void Server::ProcessData(u8 *data, u32 datasize, u16 peer_id)
{
        DSTACK(__FUNCTION_NAME);
        // Environment is locked first.
        JMutexAutoLock envlock(m_env_mutex);
        JMutexAutoLock conlock(m_con_mutex);
        
        con::Peer *peer;
        try{
                peer = m_con.GetPeer(peer_id);
        }
        catch(con::PeerNotFoundException &e)
        {
                derr_server<<DTIME<<"Server::ProcessData(): Cancelling: peer "
                                <<peer_id<<" not found"<<std::endl;
                return;
        }
        
        u8 peer_ser_ver = getClient(peer->id)->serialization_version;

        try
        {

        if(datasize < 2)
                return;

        ToServerCommand command = (ToServerCommand)readU16(&data[0]);
        
        if(command == TOSERVER_INIT)
        {
                // [0] u16 TOSERVER_INIT
                // [2] u8 SER_FMT_VER_HIGHEST
                // [3] u8[20] player_name

                if(datasize < 3)
                        return;

                derr_server<<DTIME<<"Server: Got TOSERVER_INIT from "
                                <<peer->id<<std::endl;

                // First byte after command is maximum supported
                // serialization version
                u8 client_max = data[2];
                u8 our_max = SER_FMT_VER_HIGHEST;
                // Use the highest version supported by both
                u8 deployed = core::min_(client_max, our_max);
                // If it's lower than the lowest supported, give up.
                if(deployed < SER_FMT_VER_LOWEST)
                        deployed = SER_FMT_VER_INVALID;

                //peer->serialization_version = deployed;
                getClient(peer->id)->pending_serialization_version = deployed;

                if(deployed == SER_FMT_VER_INVALID)
                {
                        derr_server<<DTIME<<"Server: Cannot negotiate "
                                        "serialization version with peer "
                                        <<peer_id<<std::endl;
                        return;
                }

                /*
                        Set up player
                */
                
                // Get player name
                const u32 playername_size = 20;
                char playername[playername_size];
                for(u32 i=0; i<playername_size-1; i++)
                {
                        playername[i] = data[3+i];
                }
                playername[playername_size-1] = 0;
                
                // Get player
                Player *player = emergePlayer(playername, "", peer_id);
                //Player *player = m_env.getPlayer(peer_id);

                /*{
                        // DEBUG: Test serialization
                        std::ostringstream test_os;
                        player->serialize(test_os);
                        dstream<<"Player serialization test: \""<<test_os.str()
                                        <<"\""<<std::endl;
                        std::istringstream test_is(test_os.str());
                        player->deSerialize(test_is);
                }*/

                // If failed, cancel
                if(player == NULL)
                {
                        derr_server<<DTIME<<"Server: peer_id="<<peer_id
                                        <<": failed to emerge player"<<std::endl;
                        return;
                }

                /*
                // If a client is already connected to the player, cancel
                if(player->peer_id != 0)
                {
                        derr_server<<DTIME<<"Server: peer_id="<<peer_id
                                        <<" tried to connect to "
                                        "an already connected player (peer_id="
                                        <<player->peer_id<<")"<<std::endl;
                        return;
                }
                // Set client of player
                player->peer_id = peer_id;
                */

                // Check if player doesn't exist
                if(player == NULL)
                        throw con::InvalidIncomingDataException
                                ("Server::ProcessData(): INIT: Player doesn't exist");

                /*// update name if it was supplied
                if(datasize >= 20+3)
                {
                        data[20+3-1] = 0;
                        player->updateName((const char*)&data[3]);
                }*/

                // Now answer with a TOCLIENT_INIT
                
                SharedBuffer<u8> reply(2+1+6+8);
                writeU16(&reply[0], TOCLIENT_INIT);
                writeU8(&reply[2], deployed);
                writeV3S16(&reply[2+1], floatToInt(player->getPosition()+v3f(0,BS/2,0), BS));
                //writeU64(&reply[2+1+6], m_env.getServerMap().getSeed());
                
                // Send as reliable
                m_con.Send(peer_id, 0, reply, true);

                return;
        }
        if(command == TOSERVER_INIT2)
        {
                derr_server<<DTIME<<"Server: Got TOSERVER_INIT2 from "
                                <<peer->id<<std::endl;


                getClient(peer->id)->serialization_version
                                = getClient(peer->id)->pending_serialization_version;

                /*
                        Send some initialization data
                */
                
                // Send player info to all players
                SendPlayerInfos();

                // Send inventory to player
                SendInventory(peer->id);
                
                // Send time of day
                {
                        SharedBuffer<u8> data = makePacket_TOCLIENT_TIME_OF_DAY(
                                        m_time_of_day.get());
                        m_con.Send(peer->id, 0, data, true);
                }
                
                // 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 game";
                        BroadcastChatMessage(message);
                }

                return;
        }

        if(peer_ser_ver == SER_FMT_VER_INVALID)
        {
                derr_server<<DTIME<<"Server::ProcessData(): Cancelling: Peer"
                                " serialization format invalid or not initialized."
                                " Skipping incoming command="<<command<<std::endl;
                return;
        }
        
        Player *player = m_env.getPlayer(peer_id);

        if(player == NULL){
                derr_server<<"Server::ProcessData(): Cancelling: "
                                "No player for peer_id="<<peer_id
                                <<std::endl;
                return;
        }
        if(command == TOSERVER_PLAYERPOS)
        {
                if(datasize < 2+12+12+4+4)
                        return;
        
                u32 start = 0;
                v3s32 ps = readV3S32(&data[start+2]);
                v3s32 ss = readV3S32(&data[start+2+12]);
                f32 pitch = (f32)readS32(&data[2+12+12]) / 100.0;
                f32 yaw = (f32)readS32(&data[2+12+12+4]) / 100.0;
                v3f position((f32)ps.X/100., (f32)ps.Y/100., (f32)ps.Z/100.);
                v3f speed((f32)ss.X/100., (f32)ss.Y/100., (f32)ss.Z/100.);
                pitch = wrapDegrees(pitch);
                yaw = wrapDegrees(yaw);
                player->setPosition(position);
                player->setSpeed(speed);
                player->setPitch(pitch);
                player->setYaw(yaw);
                
                /*dout_server<<"Server::ProcessData(): Moved player "<<peer_id<<" to "
                                <<"("<<position.X<<","<<position.Y<<","<<position.Z<<")"
                                <<" pitch="<<pitch<<" yaw="<<yaw<<std::endl;*/
        }
        else if(command == TOSERVER_GOTBLOCKS)
        {
                if(datasize < 2+1)
                        return;
                
                /*
                        [0] u16 command
                        [2] u8 count
                        [3] v3s16 pos_0
                        [3+6] v3s16 pos_1
                        ...
                */

                u16 count = data[2];
                for(u16 i=0; i<count; i++)
                {
                        if((s16)datasize < 2+1+(i+1)*6)
                                throw con::InvalidIncomingDataException
                                        ("GOTBLOCKS length is too short");
                        v3s16 p = readV3S16(&data[2+1+i*6]);
                        /*dstream<<"Server: GOTBLOCKS ("
                                        <<p.X<<","<<p.Y<<","<<p.Z<<")"<<std::endl;*/
                        RemoteClient *client = getClient(peer_id);
                        client->GotBlock(p);
                }
        }
        else if(command == TOSERVER_DELETEDBLOCKS)
        {
                if(datasize < 2+1)
                        return;
                
                /*
                        [0] u16 command
                        [2] u8 count
                        [3] v3s16 pos_0
                        [3+6] v3s16 pos_1
                        ...
                */

                u16 count = data[2];
                for(u16 i=0; i<count; i++)
                {
                        if((s16)datasize < 2+1+(i+1)*6)
                                throw con::InvalidIncomingDataException
                                        ("DELETEDBLOCKS length is too short");
                        v3s16 p = readV3S16(&data[2+1+i*6]);
                        /*dstream<<"Server: DELETEDBLOCKS ("
                                        <<p.X<<","<<p.Y<<","<<p.Z<<")"<<std::endl;*/
                        RemoteClient *client = getClient(peer_id);
                        client->SetBlockNotSent(p);
                }
        }
        else if(command == TOSERVER_CLICK_OBJECT)
        {
                if(datasize < 13)
                        return;

                /*
                        [0] u16 command
                        [2] u8 button (0=left, 1=right)
                        [3] v3s16 block
                        [9] s16 id
                        [11] u16 item
                */
                u8 button = readU8(&data[2]);
                v3s16 p;
                p.X = readS16(&data[3]);
                p.Y = readS16(&data[5]);
                p.Z = readS16(&data[7]);
                s16 id = readS16(&data[9]);
                //u16 item_i = readU16(&data[11]);

                MapBlock *block = NULL;
                try
                {
                        block = m_env.getMap().getBlockNoCreate(p);
                }
                catch(InvalidPositionException &e)
                {
                        derr_server<<"CLICK_OBJECT block not found"<<std::endl;
                        return;
                }

                MapBlockObject *obj = block->getObject(id);

                if(obj == NULL)
                {
                        derr_server<<"CLICK_OBJECT object not found"<<std::endl;
                        return;
                }

                //TODO: Check that object is reasonably close
                
                // Left click
                if(button == 0)
                {
                        InventoryList *ilist = player->inventory.getList("main");
                        if(g_settings.getBool("creative_mode") == false && ilist != NULL)
                        {
                        
                                // Skip if inventory has no free space
                                if(ilist->getUsedSlots() == ilist->getSize())
                                {
                                        dout_server<<"Player inventory has no free space"<<std::endl;
                                        return;
                                }
                                
                                /*
                                        Create the inventory item
                                */
                                InventoryItem *item = NULL;
                                // If it is an item-object, take the item from it
                                if(obj->getTypeId() == MAPBLOCKOBJECT_TYPE_ITEM)
                                {
                                        item = ((ItemObject*)obj)->createInventoryItem();
                                }
                                // Else create an item of the object
                                else
                                {
                                        item = new MapBlockObjectItem
                                                        (obj->getInventoryString());
                                }
                                
                                // Add to inventory and send inventory
                                ilist->addItem(item);
                                SendInventory(player->peer_id);
                        }

                        // Remove from block
                        block->removeObject(id);
                }
        }
        else if(command == TOSERVER_GROUND_ACTION)
        {
                if(datasize < 17)
                        return;
                /*
                        length: 17
                        [0] u16 command
                        [2] u8 action
                        [3] v3s16 nodepos_undersurface
                        [9] v3s16 nodepos_abovesurface
                        [15] u16 item
                        actions:
                        0: start digging
                        1: place block
                        2: stop digging (all parameters ignored)
                        3: digging completed
                */
                u8 action = readU8(&data[2]);
                v3s16 p_under;
                p_under.X = readS16(&data[3]);
                p_under.Y = readS16(&data[5]);
                p_under.Z = readS16(&data[7]);
                v3s16 p_over;
                p_over.X = readS16(&data[9]);
                p_over.Y = readS16(&data[11]);
                p_over.Z = readS16(&data[13]);
                u16 item_i = readU16(&data[15]);

                //TODO: Check that target is reasonably close
                
                /*
                        0: start digging
                */
                if(action == 0)
                {
                        /*
                                NOTE: This can be used in the future to check if
                                somebody is cheating, by checking the timing.
                        */
                } // action == 0

                /*
                        2: stop digging
                */
                else if(action == 2)
                {
#if 0
                        RemoteClient *client = getClient(peer->id);
                        JMutexAutoLock digmutex(client->m_dig_mutex);
                        client->m_dig_tool_item = -1;
#endif
                }

                /*
                        3: Digging completed
                */
                else if(action == 3)
                {
                        // Mandatory parameter; actually used for nothing
                        core::map<v3s16, MapBlock*> modified_blocks;

                        u8 material;
                        u8 mineral = MINERAL_NONE;

                        try
                        {
                                MapNode n = m_env.getMap().getNode(p_under);
                                // Get material at position
                                material = n.d;
                                // If it's not diggable, do nothing
                                if(content_diggable(material) == false)
                                {
                                        derr_server<<"Server: Not finishing digging: Node not diggable"
                                                        <<std::endl;

                                        // Client probably has wrong data.
                                        // Set block not sent, so that client will get
                                        // a valid one.
                                        dstream<<"Client "<<peer_id<<" tried to dig "
                                                        <<"node from invalid position; setting"
                                                        <<" MapBlock not sent."<<std::endl;
                                        RemoteClient *client = getClient(peer_id);
                                        v3s16 blockpos = getNodeBlockPos(p_under);
                                        client->SetBlockNotSent(blockpos);
                                                
                                        return;
                                }
                                // Get mineral
                                mineral = n.getMineral();
                        }
                        catch(InvalidPositionException &e)
                        {
                                derr_server<<"Server: Not finishing digging: Node not found."
                                                <<" Adding block to emerge queue."
                                                <<std::endl;
                                m_emerge_queue.addBlock(peer_id,
                                                getNodeBlockPos(p_over), BLOCK_EMERGE_FLAG_FROMDISK);
                                return;
                        }
                        
                        /*
                                Send the removal to all other clients
                        */
                        sendRemoveNode(p_under, peer_id);
                        
                        /*
                                Update and send inventory
                        */

                        if(g_settings.getBool("creative_mode") == false)
                        {
                                /*
                                        Wear out tool
                                */
                                InventoryList *mlist = player->inventory.getList("main");
                                if(mlist != NULL)
                                {
                                        InventoryItem *item = mlist->getItem(item_i);
                                        if(item && (std::string)item->getName() == "ToolItem")
                                        {
                                                ToolItem *titem = (ToolItem*)item;
                                                std::string toolname = titem->getToolName();

                                                // Get digging properties for material and tool
                                                DiggingProperties prop =
                                                                getDiggingProperties(material, toolname);

                                                if(prop.diggable == false)
                                                {
                                                        derr_server<<"Server: WARNING: Player digged"
                                                                        <<" with impossible material + tool"
                                                                        <<" combination"<<std::endl;
                                                }
                                                
                                                bool weared_out = titem->addWear(prop.wear);

                                                if(weared_out)
                                                {
                                                        mlist->deleteItem(item_i);
                                                }
                                        }
                                }

                                /*
                                        Add dug item to inventory
                                */

                                InventoryItem *item = NULL;

                                if(mineral != MINERAL_NONE)
                                        item = getDiggedMineralItem(mineral);
                                
                                // If not mineral
                                if(item == NULL)
                                {
                                        std::string &dug_s = content_features(material).dug_item;
                                        if(dug_s != "")
                                        {
                                                std::istringstream is(dug_s, std::ios::binary);
                                                item = InventoryItem::deSerialize(is);
                                        }
                                }
                                
                                if(item != NULL)
                                {
                                        // Add a item to inventory
                                        player->inventory.addItem("main", item);

                                        // Send inventory
                                        SendInventory(player->peer_id);
                                }
                        }

                        /*
                                Remove the node
                                (this takes some time so it is done after the quick stuff)
                        */
                        m_ignore_map_edit_events = true;
                        m_env.getMap().removeNodeAndUpdate(p_under, modified_blocks);
                        m_ignore_map_edit_events = false;
                }
                
                /*
                        1: place block
                */
                else if(action == 1)
                {

                        InventoryList *ilist = player->inventory.getList("main");
                        if(ilist == NULL)
                                return;

                        // Get item
                        InventoryItem *item = ilist->getItem(item_i);
                        
                        // If there is no item, it is not possible to add it anywhere
                        if(item == NULL)
                                return;
                        
                        /*
                                Handle material items
                        */
                        if(std::string("MaterialItem") == item->getName())
                        {
                                try{
                                        // Don't add a node if this is not a free space
                                        MapNode n2 = m_env.getMap().getNode(p_over);
                                        if(content_buildable_to(n2.d) == false)
                                        {
                                                // Client probably has wrong data.
                                                // Set block not sent, so that client will get
                                                // a valid one.
                                                dstream<<"Client "<<peer_id<<" tried to place"
                                                                <<" node in invalid position; setting"
                                                                <<" MapBlock not sent."<<std::endl;
                                                RemoteClient *client = getClient(peer_id);
                                                v3s16 blockpos = getNodeBlockPos(p_over);
                                                client->SetBlockNotSent(blockpos);
                                                return;
                                        }
                                }
                                catch(InvalidPositionException &e)
                                {
                                        derr_server<<"Server: Ignoring ADDNODE: Node not found"
                                                        <<" Adding block to emerge queue."
                                                        <<std::endl;
                                        m_emerge_queue.addBlock(peer_id,
                                                        getNodeBlockPos(p_over), BLOCK_EMERGE_FLAG_FROMDISK);
                                        return;
                                }

                                // Reset build time counter
                                getClient(peer->id)->m_time_from_building = 0.0;
                                
                                // Create node data
                                MaterialItem *mitem = (MaterialItem*)item;
                                MapNode n;
                                n.d = mitem->getMaterial();
                                if(content_features(n.d).wall_mounted)
                                        n.dir = packDir(p_under - p_over);
                                
                                /*
                                        Send to all players
                                */
                                sendAddNode(p_over, n, 0);
                                
                                /*
                                        Handle inventory
                                */
                                InventoryList *ilist = player->inventory.getList("main");
                                if(g_settings.getBool("creative_mode") == false && ilist)
                                {
                                        // Remove from inventory and send inventory
                                        if(mitem->getCount() == 1)
                                                ilist->deleteItem(item_i);
                                        else
                                                mitem->remove(1);
                                        // Send inventory
                                        SendInventory(peer_id);
                                }
                                
                                /*
                                        Add node.

                                        This takes some time so it is done after the quick stuff
                                */
                                core::map<v3s16, MapBlock*> modified_blocks;
                                m_ignore_map_edit_events = true;
                                m_env.getMap().addNodeAndUpdate(p_over, n, modified_blocks);
                                m_ignore_map_edit_events = false;
                                
                                /*
                                        Calculate special events
                                */
                                
                                /*if(n.d == CONTENT_MESE)
                                {
                                        u32 count = 0;
                                        for(s16 z=-1; z<=1; z++)
                                        for(s16 y=-1; y<=1; y++)
                                        for(s16 x=-1; x<=1; x++)
                                        {
                                                
                                        }
                                }*/
                        }
                        /*
                                Handle other items
                        */
                        else
                        {
                                v3s16 blockpos = getNodeBlockPos(p_over);

                                MapBlock *block = NULL;
                                try
                                {
                                        block = m_env.getMap().getBlockNoCreate(blockpos);
                                }
                                catch(InvalidPositionException &e)
                                {
                                        derr_server<<"Error while placing object: "
                                                        "block not found"<<std::endl;
                                        return;
                                }

                                v3s16 block_pos_i_on_map = block->getPosRelative();
                                v3f block_pos_f_on_map = intToFloat(block_pos_i_on_map, BS);

                                v3f pos = intToFloat(p_over, BS);
                                pos -= block_pos_f_on_map;
                                
                                /*dout_server<<"pos="
                                                <<"("<<pos.X<<","<<pos.Y<<","<<pos.Z<<")"
                                                <<std::endl;*/

                                MapBlockObject *obj = NULL;

                                /*
                                        Handle block object items
                                */
                                if(std::string("MBOItem") == item->getName())
                                {
                                        MapBlockObjectItem *oitem = (MapBlockObjectItem*)item;

                                        /*dout_server<<"Trying to place a MapBlockObjectItem: "
                                                        "inventorystring=\""
                                                        <<oitem->getInventoryString()
                                                        <<"\""<<std::endl;*/
                                                        
                                        obj = oitem->createObject
                                                        (pos, player->getYaw(), player->getPitch());
                                }
                                /*
                                        Handle other items
                                */
                                else
                                {
                                        dout_server<<"Placing a miscellaneous item on map"
                                                        <<std::endl;
                                        /*
                                                Create an ItemObject that contains the item.
                                        */
                                        ItemObject *iobj = new ItemObject(NULL, -1, pos);
                                        std::ostringstream os(std::ios_base::binary);
                                        item->serialize(os);
                                        dout_server<<"Item string is \""<<os.str()<<"\""<<std::endl;
                                        iobj->setItemString(os.str());
                                        obj = iobj;
                                }

                                if(obj == NULL)
                                {
                                        derr_server<<"WARNING: item resulted in NULL object, "
                                                        <<"not placing onto map"
                                                        <<std::endl;
                                }
                                else
                                {
                                        block->addObject(obj);

                                        dout_server<<"Placed object"<<std::endl;

                                        InventoryList *ilist = player->inventory.getList("main");
                                        if(g_settings.getBool("creative_mode") == false && ilist)
                                        {
                                                // Remove from inventory and send inventory
                                                ilist->deleteItem(item_i);
                                                // Send inventory
                                                SendInventory(peer_id);
                                        }
                                }
                        }

                } // action == 1

                /*
                        Catch invalid actions
                */
                else
                {
                        derr_server<<"WARNING: Server: Invalid action "
                                        <<action<<std::endl;
                }
        }
#if 0
        else if(command == TOSERVER_RELEASE)
        {
                if(datasize < 3)
                        return;
                /*
                        length: 3
                        [0] u16 command
                        [2] u8 button
                */
                dstream<<"TOSERVER_RELEASE ignored"<<std::endl;
        }
#endif
        else if(command == TOSERVER_SIGNTEXT)
        {
                /*
                        u16 command
                        v3s16 blockpos
                        s16 id
                        u16 textlen
                        textdata
                */
                std::string datastring((char*)&data[2], datasize-2);
                std::istringstream is(datastring, std::ios_base::binary);
                u8 buf[6];
                // Read stuff
                is.read((char*)buf, 6);
                v3s16 blockpos = readV3S16(buf);
                is.read((char*)buf, 2);
                s16 id = readS16(buf);
                is.read((char*)buf, 2);
                u16 textlen = readU16(buf);
                std::string text;
                for(u16 i=0; i<textlen; i++)
                {
                        is.read((char*)buf, 1);
                        text += (char)buf[0];
                }

                MapBlock *block = NULL;
                try
                {
                        block = m_env.getMap().getBlockNoCreate(blockpos);
                }
                catch(InvalidPositionException &e)
                {
                        derr_server<<"Error while setting sign text: "
                                        "block not found"<<std::endl;
                        return;
                }

                MapBlockObject *obj = block->getObject(id);
                if(obj == NULL)
                {
                        derr_server<<"Error while setting sign text: "
                                        "object not found"<<std::endl;
                        return;
                }
                
                if(obj->getTypeId() != MAPBLOCKOBJECT_TYPE_SIGN)
                {
                        derr_server<<"Error while setting sign text: "
                                        "object is not a sign"<<std::endl;
                        return;
                }

                ((SignObject*)obj)->setText(text);

                obj->getBlock()->setChangedFlag();
        }
        else if(command == TOSERVER_SIGNNODETEXT)
        {
                /*
                        u16 command
                        v3s16 p
                        u16 textlen
                        textdata
                */
                std::string datastring((char*)&data[2], datasize-2);
                std::istringstream is(datastring, std::ios_base::binary);
                u8 buf[6];
                // Read stuff
                is.read((char*)buf, 6);
                v3s16 p = readV3S16(buf);
                is.read((char*)buf, 2);
                u16 textlen = readU16(buf);
                std::string text;
                for(u16 i=0; i<textlen; i++)
                {
                        is.read((char*)buf, 1);
                        text += (char)buf[0];
                }

                NodeMetadata *meta = m_env.getMap().getNodeMetadata(p);
                if(!meta)
                        return;
                if(meta->typeId() != CONTENT_SIGN_WALL)
                        return;
                SignNodeMetadata *signmeta = (SignNodeMetadata*)meta;
                signmeta->setText(text);
                
                v3s16 blockpos = getNodeBlockPos(p);
                MapBlock *block = m_env.getMap().getBlockNoCreateNoEx(blockpos);
                if(block)
                {
                        block->setChangedFlag();
                }

                for(core::map<u16, RemoteClient*>::Iterator
                        i = m_clients.getIterator();
                        i.atEnd()==false; i++)
                {
                        RemoteClient *client = i.getNode()->getValue();
                        client->SetBlockNotSent(blockpos);
                }
        }
        else if(command == TOSERVER_INVENTORY_ACTION)
        {
                /*// Ignore inventory changes if in creative mode
                if(g_settings.getBool("creative_mode") == true)
                {
                        dstream<<"TOSERVER_INVENTORY_ACTION: ignoring in creative mode"
                                        <<std::endl;
                        return;
                }*/
                // Strip command and create a stream
                std::string datastring((char*)&data[2], datasize-2);
                dstream<<"TOSERVER_INVENTORY_ACTION: data="<<datastring<<std::endl;
                std::istringstream is(datastring, std::ios_base::binary);
                // Create an action
                InventoryAction *a = InventoryAction::deSerialize(is);
                if(a != NULL)
                {
                        // Create context
                        InventoryContext c;
                        c.current_player = player;

                        /*
                                Handle craftresult specially if not in creative mode
                        */
                        bool disable_action = false;
                        if(a->getType() == IACTION_MOVE
                                        && g_settings.getBool("creative_mode") == false)
                        {
                                IMoveAction *ma = (IMoveAction*)a;
                                if(ma->to_inv == "current_player" &&
                                                ma->from_inv == "current_player")
                                {
                                        // Don't allow moving anything to craftresult
                                        if(ma->to_list == "craftresult")
                                        {
                                                // Do nothing
                                                disable_action = true;
                                        }
                                        // When something is removed from craftresult
                                        if(ma->from_list == "craftresult")
                                        {
                                                disable_action = true;
                                                // Remove stuff from craft
                                                InventoryList *clist = player->inventory.getList("craft");
                                                if(clist)
                                                {
                                                        u16 count = ma->count;
                                                        if(count == 0)
                                                                count = 1;
                                                        clist->decrementMaterials(count);
                                                }
                                                // Do action
                                                // Feed action to player inventory
                                                //a->apply(&player->inventory);
                                                a->apply(&c, this);
                                                // Eat it
                                                delete a;
                                                // If something appeared in craftresult, throw it
                                                // in the main list
                                                InventoryList *rlist = player->inventory.getList("craftresult");
                                                InventoryList *mlist = player->inventory.getList("main");
                                                if(rlist && mlist && rlist->getUsedSlots() == 1)
                                                {
                                                        InventoryItem *item1 = rlist->changeItem(0, NULL);
                                                        mlist->addItem(item1);
                                                }
                                        }
                                }
                        }
                        
                        if(disable_action == false)
                        {
                                // Feed action to player inventory
                                //a->apply(&player->inventory);
                                a->apply(&c, this);
                                // Eat the action
                                delete a;
                        }
                        else
                        {
                                // Send inventory
                                SendInventory(player->peer_id);
                        }
                }
                else
                {
                        dstream<<"TOSERVER_INVENTORY_ACTION: "
                                        <<"InventoryAction::deSerialize() returned NULL"
                                        <<std::endl;
                }
        }
        else if(command == TOSERVER_CHAT_MESSAGE)
        {
                /*
                        u16 command
                        u16 length
                        wstring message
                */
                u8 buf[6];
                std::string datastring((char*)&data[2], datasize-2);
                std::istringstream is(datastring, std::ios_base::binary);
                
                // Read stuff
                is.read((char*)buf, 2);
                u16 len = readU16(buf);
                
                std::wstring message;
                for(u16 i=0; i<len; i++)
                {
                        is.read((char*)buf, 2);
                        message += (wchar_t)readU16(buf);
                }

                // Get player name of this client
                std::wstring name = narrow_to_wide(player->getName());
                
                // Line to send to players
                std::wstring line;
                // Whether to send to the player that sent the line
                bool send_to_sender = false;
                // Whether to send to other players
                bool send_to_others = false;
                
                // Parse commands
                std::wstring commandprefix = L"/#";
                if(message.substr(0, commandprefix.size()) == commandprefix)
                {
                        line += L"Server: ";

                        message = message.substr(commandprefix.size());
                        // Get player name as narrow string
                        std::string name_s = player->getName();
                        // Convert message to narrow string
                        std::string message_s = wide_to_narrow(message);
                        // Operator is the single name defined in config.
                        std::string operator_name = g_settings.get("name");
                        bool is_operator = (operator_name != "" &&
                                        wide_to_narrow(name) == operator_name);
                        bool valid_command = false;
                        if(message_s == "help")
                        {
                                line += L"-!- Available commands: ";
                                line += L"status ";
                                if(is_operator)
                                {
                                        line += L"shutdown setting ";
                                }
                                else
                                {
                                }
                                send_to_sender = true;
                                valid_command = true;
                        }
                        else if(message_s == "status")
                        {
                                line = getStatusString();
                                send_to_sender = true;
                                valid_command = true;
                        }
                        else if(is_operator)
                        {
                                if(message_s == "shutdown")
                                {
                                        dstream<<DTIME<<" Server: Operator requested shutdown."
                                                        <<std::endl;
                                        m_shutdown_requested.set(true);
                                        
                                        line += L"*** Server shutting down (operator request)";
                                        send_to_sender = true;
                                        valid_command = true;
                                }
                                else if(message_s.substr(0,8) == "setting ")
                                {
                                        std::string confline = message_s.substr(8);
                                        g_settings.parseConfigLine(confline);
                                        line += L"-!- Setting changed.";
                                        send_to_sender = true;
                                        valid_command = true;
                                }
                        }
                        
                        if(valid_command == false)
                        {
                                line += L"-!- Invalid command: " + message;
                                send_to_sender = true;
                        }
                }
                else
                {
                        line += L"<";
                        /*if(is_operator)
                                line += L"@";*/
                        line += name;
                        line += L"> ";
                        line += message;
                        send_to_others = true;
                }
                
                if(line != L"")
                {
                        dstream<<"CHAT: "<<wide_to_narrow(line)<<std::endl;

                        /*
                                Send the message to clients
                        */
                        for(core::map<u16, RemoteClient*>::Iterator
                                i = m_clients.getIterator();
                                i.atEnd() == false; i++)
                        {
                                // Get client and check that it is valid
                                RemoteClient *client = i.getNode()->getValue();
                                assert(client->peer_id == i.getNode()->getKey());
                                if(client->serialization_version == SER_FMT_VER_INVALID)
                                        continue;

                                // Filter recipient
                                bool sender_selected = (peer_id == client->peer_id);
                                if(sender_selected == true && send_to_sender == false)
                                        continue;
                                if(sender_selected == false && send_to_others == false)
                                        continue;

                                SendChatMessage(client->peer_id, line);
                        }
                }
        }
        else
        {
                derr_server<<"WARNING: Server::ProcessData(): Ignoring "
                                "unknown command "<<command<<std::endl;
        }
        
        } //try
        catch(SendFailedException &e)
        {
                derr_server<<"Server::ProcessData(): SendFailedException: "
                                <<"what="<<e.what()
                                <<std::endl;
        }
}

void Server::onMapEditEvent(MapEditEvent *event)
{
        dstream<<"Server::onMapEditEvent()"<<std::endl;
        if(m_ignore_map_edit_events)
                return;
        MapEditEvent *e = event->clone();
        m_unsent_map_edit_queue.push_back(e);
}

Inventory* Server::getInventory(InventoryContext *c, std::string id)
{
        if(id == "current_player")
        {
                assert(c->current_player);
                return &(c->current_player->inventory);
        }
        
        Strfnd fn(id);
        std::string id0 = fn.next(":");

        if(id0 == "nodemeta")
        {
                v3s16 p;
                p.X = stoi(fn.next(","));
                p.Y = stoi(fn.next(","));
                p.Z = stoi(fn.next(","));
                NodeMetadata *meta = m_env.getMap().getNodeMetadata(p);
                if(meta)
                        return meta->getInventory();
                dstream<<"nodemeta at ("<<p.X<<","<<p.Y<<","<<p.Z<<"): "
                                <<"no metadata found"<<std::endl;
                return NULL;
        }

        dstream<<__FUNCTION_NAME<<": unknown id "<<id<<std::endl;
        return NULL;
}
void Server::inventoryModified(InventoryContext *c, std::string id)
{
        if(id == "current_player")
        {
                assert(c->current_player);
                // Send inventory
                SendInventory(c->current_player->peer_id);
                return;
        }
        
        Strfnd fn(id);
        std::string id0 = fn.next(":");

        if(id0 == "nodemeta")
        {
                v3s16 p;
                p.X = stoi(fn.next(","));
                p.Y = stoi(fn.next(","));
                p.Z = stoi(fn.next(","));
                assert(c->current_player);
                RemoteClient *client = getClient(c->current_player->peer_id);
                v3s16 blockpos = getNodeBlockPos(p);
                client->SetBlockNotSent(blockpos);
                return;
        }

        dstream<<__FUNCTION_NAME<<": unknown id "<<id<<std::endl;
}

core::list<PlayerInfo> Server::getPlayerInfo()
{
        DSTACK(__FUNCTION_NAME);
        JMutexAutoLock envlock(m_env_mutex);
        JMutexAutoLock conlock(m_con_mutex);
        
        core::list<PlayerInfo> list;

        core::list<Player*> players = m_env.getPlayers();
        
        core::list<Player*>::Iterator i;
        for(i = players.begin();
                        i != players.end(); i++)
        {
                PlayerInfo info;

                Player *player = *i;

                try{
                        con::Peer *peer = m_con.GetPeer(player->peer_id);
                        // Copy info from peer to info struct
                        info.id = peer->id;
                        info.address = peer->address;
                        info.avg_rtt = peer->avg_rtt;
                }
                catch(con::PeerNotFoundException &e)
                {
                        // Set dummy peer info
                        info.id = 0;
                        info.address = Address(0,0,0,0,0);
                        info.avg_rtt = 0.0;
                }

                snprintf(info.name, PLAYERNAME_SIZE, "%s", player->getName());
                info.position = player->getPosition();

                list.push_back(info);
        }

        return list;
}


void Server::peerAdded(con::Peer *peer)
{
        DSTACK(__FUNCTION_NAME);
        dout_server<<"Server::peerAdded(): peer->id="
                        <<peer->id<<std::endl;
        
        PeerChange c;
        c.type = PEER_ADDED;
        c.peer_id = peer->id;
        c.timeout = false;
        m_peer_change_queue.push_back(c);
}

void Server::deletingPeer(con::Peer *peer, bool timeout)
{
        DSTACK(__FUNCTION_NAME);
        dout_server<<"Server::deletingPeer(): peer->id="
                        <<peer->id<<", timeout="<<timeout<<std::endl;
        
        PeerChange c;
        c.type = PEER_REMOVED;
        c.peer_id = peer->id;
        c.timeout = timeout;
        m_peer_change_queue.push_back(c);
}

void Server::SendObjectData(float dtime)
{
        DSTACK(__FUNCTION_NAME);

        core::map<v3s16, bool> stepped_blocks;
        
        for(core::map<u16, RemoteClient*>::Iterator
                i = m_clients.getIterator();
                i.atEnd() == false; i++)
        {
                u16 peer_id = i.getNode()->getKey();
                RemoteClient *client = i.getNode()->getValue();
                assert(client->peer_id == peer_id);
                
                if(client->serialization_version == SER_FMT_VER_INVALID)
                        continue;
                
                client->SendObjectData(this, dtime, stepped_blocks);
        }
}

void Server::SendPlayerInfos()
{
        DSTACK(__FUNCTION_NAME);

        //JMutexAutoLock envlock(m_env_mutex);
        
        // Get connected players
        core::list<Player*> players = m_env.getPlayers(true);
        
        u32 player_count = players.getSize();
        u32 datasize = 2+(2+PLAYERNAME_SIZE)*player_count;

        SharedBuffer<u8> data(datasize);
        writeU16(&data[0], TOCLIENT_PLAYERINFO);
        
        u32 start = 2;
        core::list<Player*>::Iterator i;
        for(i = players.begin();
                        i != players.end(); i++)
        {
                Player *player = *i;

                /*dstream<<"Server sending player info for player with "
                                "peer_id="<<player->peer_id<<std::endl;*/
                
                writeU16(&data[start], player->peer_id);
                memset((char*)&data[start+2], 0, PLAYERNAME_SIZE);
                snprintf((char*)&data[start+2], PLAYERNAME_SIZE, "%s", player->getName());
                start += 2+PLAYERNAME_SIZE;
        }

        //JMutexAutoLock conlock(m_con_mutex);

        // Send as reliable
        m_con.SendToAll(0, data, true);
}

/*
        Craft checking system
*/

enum ItemSpecType
{
        ITEM_NONE,
        ITEM_MATERIAL,
        ITEM_CRAFT,
        ITEM_TOOL,
        ITEM_MBO
};

struct ItemSpec
{
        ItemSpec():
                type(ITEM_NONE)
        {
        }
        ItemSpec(enum ItemSpecType a_type, std::string a_name):
                type(a_type),
                name(a_name),
                num(65535)
        {
        }
        ItemSpec(enum ItemSpecType a_type, u16 a_num):
                type(a_type),
                name(""),
                num(a_num)
        {
        }
        enum ItemSpecType type;
        // Only other one of these is used
        std::string name;
        u16 num;
};

/*
        items: a pointer to an array of 9 pointers to items
        specs: a pointer to an array of 9 ItemSpecs
*/
bool checkItemCombination(InventoryItem **items, ItemSpec *specs)
{
        u16 items_min_x = 100;
        u16 items_max_x = 100;
        u16 items_min_y = 100;
        u16 items_max_y = 100;
        for(u16 y=0; y<3; y++)
        for(u16 x=0; x<3; x++)
        {
                if(items[y*3 + x] == NULL)
                        continue;
                if(items_min_x == 100 || x < items_min_x)
                        items_min_x = x;
                if(items_min_y == 100 || y < items_min_y)
                        items_min_y = y;
                if(items_max_x == 100 || x > items_max_x)
                        items_max_x = x;
                if(items_max_y == 100 || y > items_max_y)
                        items_max_y = y;
        }
        // No items at all, just return false
        if(items_min_x == 100)
                return false;
        
        u16 items_w = items_max_x - items_min_x + 1;
        u16 items_h = items_max_y - items_min_y + 1;

        u16 specs_min_x = 100;
        u16 specs_max_x = 100;
        u16 specs_min_y = 100;
        u16 specs_max_y = 100;
        for(u16 y=0; y<3; y++)
        for(u16 x=0; x<3; x++)
        {
                if(specs[y*3 + x].type == ITEM_NONE)
                        continue;
                if(specs_min_x == 100 || x < specs_min_x)
                        specs_min_x = x;
                if(specs_min_y == 100 || y < specs_min_y)
                        specs_min_y = y;
                if(specs_max_x == 100 || x > specs_max_x)
                        specs_max_x = x;
                if(specs_max_y == 100 || y > specs_max_y)
                        specs_max_y = y;
        }
        // No specs at all, just return false
        if(specs_min_x == 100)
                return false;

        u16 specs_w = specs_max_x - specs_min_x + 1;
        u16 specs_h = specs_max_y - specs_min_y + 1;

        // Different sizes
        if(items_w != specs_w || items_h != specs_h)
                return false;

        for(u16 y=0; y<specs_h; y++)
        for(u16 x=0; x<specs_w; x++)
        {
                u16 items_x = items_min_x + x;
                u16 items_y = items_min_y + y;
                u16 specs_x = specs_min_x + x;
                u16 specs_y = specs_min_y + y;
                InventoryItem *item = items[items_y * 3 + items_x];
                ItemSpec &spec = specs[specs_y * 3 + specs_x];
                
                if(spec.type == ITEM_NONE)
                {
                        // Has to be no item
                        if(item != NULL)
                                return false;
                        continue;
                }
                
                // There should be an item
                if(item == NULL)
                        return false;

                std::string itemname = item->getName();

                if(spec.type == ITEM_MATERIAL)
                {
                        if(itemname != "MaterialItem")
                                return false;
                        MaterialItem *mitem = (MaterialItem*)item;
                        if(mitem->getMaterial() != spec.num)
                                return false;
                }
                else if(spec.type == ITEM_CRAFT)
                {
                        if(itemname != "CraftItem")
                                return false;
                        CraftItem *mitem = (CraftItem*)item;
                        if(mitem->getSubName() != spec.name)
                                return false;
                }
                else if(spec.type == ITEM_TOOL)
                {
                        // Not supported yet
                        assert(0);
                }
                else if(spec.type == ITEM_MBO)
                {
                        // Not supported yet
                        assert(0);
                }
                else
                {
                        // Not supported yet
                        assert(0);
                }
        }

        return true;
}

void Server::SendInventory(u16 peer_id)
{
        DSTACK(__FUNCTION_NAME);
        
        Player* player = m_env.getPlayer(peer_id);

        /*
                Calculate crafting stuff
        */
        if(g_settings.getBool("creative_mode") == false)
        {
                InventoryList *clist = player->inventory.getList("craft");
                InventoryList *rlist = player->inventory.getList("craftresult");
                if(rlist)
                {
                        rlist->clearItems();
                }
                if(clist && rlist)
                {
                        InventoryItem *items[9];
                        for(u16 i=0; i<9; i++)
                        {
                                items[i] = clist->getItem(i);
                        }
                        
                        bool found = false;

                        // Wood
                        if(!found)
                        {
                                ItemSpec specs[9];
                                specs[0] = ItemSpec(ITEM_MATERIAL, CONTENT_TREE);
                                if(checkItemCombination(items, specs))
                                {
                                        rlist->addItem(new MaterialItem(CONTENT_WOOD, 4));
                                        found = true;
                                }
                        }

                        // Stick
                        if(!found)
                        {
                                ItemSpec specs[9];
                                specs[0] = ItemSpec(ITEM_MATERIAL, CONTENT_WOOD);
                                if(checkItemCombination(items, specs))
                                {
                                        rlist->addItem(new CraftItem("Stick", 4));
                                        found = true;
                                }
                        }

                        // Sign
                        if(!found)
                        {
                                ItemSpec specs[9];
                                specs[0] = ItemSpec(ITEM_MATERIAL, CONTENT_WOOD);
                                specs[1] = ItemSpec(ITEM_MATERIAL, CONTENT_WOOD);
                                specs[2] = ItemSpec(ITEM_MATERIAL, CONTENT_WOOD);
                                specs[3] = ItemSpec(ITEM_MATERIAL, CONTENT_WOOD);
                                specs[4] = ItemSpec(ITEM_MATERIAL, CONTENT_WOOD);
                                specs[5] = ItemSpec(ITEM_MATERIAL, CONTENT_WOOD);
                                specs[7] = ItemSpec(ITEM_CRAFT, "Stick");
                                if(checkItemCombination(items, specs))
                                {
                                        //rlist->addItem(new MapBlockObjectItem("Sign"));
                                        rlist->addItem(new MaterialItem(CONTENT_SIGN_WALL, 1));
                                        found = true;
                                }
                        }

                        // Torch
                        if(!found)
                        {
                                ItemSpec specs[9];
                                specs[0] = ItemSpec(ITEM_CRAFT, "lump_of_coal");
                                specs[3] = ItemSpec(ITEM_CRAFT, "Stick");
                                if(checkItemCombination(items, specs))
                                {
                                        rlist->addItem(new MaterialItem(CONTENT_TORCH, 4));
                                        found = true;
                                }
                        }

                        // Wooden pick
                        if(!found)
                        {
                                ItemSpec specs[9];
                                specs[0] = ItemSpec(ITEM_MATERIAL, CONTENT_WOOD);
                                specs[1] = ItemSpec(ITEM_MATERIAL, CONTENT_WOOD);
                                specs[2] = ItemSpec(ITEM_MATERIAL, CONTENT_WOOD);
                                specs[4] = ItemSpec(ITEM_CRAFT, "Stick");
                                specs[7] = ItemSpec(ITEM_CRAFT, "Stick");
                                if(checkItemCombination(items, specs))
                                {
                                        rlist->addItem(new ToolItem("WPick", 0));
                                        found = true;
                                }
                        }

                        // Stone pick
                        if(!found)
                        {
                                ItemSpec specs[9];
                                specs[0] = ItemSpec(ITEM_MATERIAL, CONTENT_STONE);
                                specs[1] = ItemSpec(ITEM_MATERIAL, CONTENT_STONE);
                                specs[2] = ItemSpec(ITEM_MATERIAL, CONTENT_STONE);
                                specs[4] = ItemSpec(ITEM_CRAFT, "Stick");
                                specs[7] = ItemSpec(ITEM_CRAFT, "Stick");
                                if(checkItemCombination(items, specs))
                                {
                                        rlist->addItem(new ToolItem("STPick", 0));
                                        found = true;
                                }
                        }

                        // Mese pick
                        if(!found)
                        {
                                ItemSpec specs[9];
                                specs[0] = ItemSpec(ITEM_MATERIAL, CONTENT_MESE);
                                specs[1] = ItemSpec(ITEM_MATERIAL, CONTENT_MESE);
                                specs[2] = ItemSpec(ITEM_MATERIAL, CONTENT_MESE);
                                specs[4] = ItemSpec(ITEM_CRAFT, "Stick");
                                specs[7] = ItemSpec(ITEM_CRAFT, "Stick");
                                if(checkItemCombination(items, specs))
                                {
                                        rlist->addItem(new ToolItem("MesePick", 0));
                                        found = true;
                                }
                        }

                        // Chest1
                        if(!found)
                        {
                                ItemSpec specs[9];
                                specs[0] = ItemSpec(ITEM_MATERIAL, CONTENT_WOOD);
                                specs[1] = ItemSpec(ITEM_MATERIAL, CONTENT_WOOD);
                                specs[2] = ItemSpec(ITEM_MATERIAL, CONTENT_WOOD);
                                specs[3] = ItemSpec(ITEM_MATERIAL, CONTENT_WOOD);
                                specs[5] = ItemSpec(ITEM_MATERIAL, CONTENT_WOOD);
                                specs[6] = ItemSpec(ITEM_MATERIAL, CONTENT_WOOD);
                                specs[7] = ItemSpec(ITEM_MATERIAL, CONTENT_WOOD);
                                specs[8] = ItemSpec(ITEM_MATERIAL, CONTENT_WOOD);
                                if(checkItemCombination(items, specs))
                                {
                                        rlist->addItem(new MaterialItem(CONTENT_CHEST, 1));
                                        found = true;
                                }
                        }

                }
        } // if creative_mode == false

        /*
                Serialize it
        */

        std::ostringstream os;
        //os.imbue(std::locale("C"));

        player->inventory.serialize(os);

        std::string s = os.str();
        
        SharedBuffer<u8> data(s.size()+2);
        writeU16(&data[0], TOCLIENT_INVENTORY);
        memcpy(&data[2], s.c_str(), s.size());
        
        // Send as reliable
        m_con.Send(peer_id, 0, data, true);
}

void Server::SendChatMessage(u16 peer_id, const std::wstring &message)
{
        DSTACK(__FUNCTION_NAME);
        
        std::ostringstream os(std::ios_base::binary);
        u8 buf[12];
        
        // Write command
        writeU16(buf, TOCLIENT_CHAT_MESSAGE);
        os.write((char*)buf, 2);
        
        // Write length
        writeU16(buf, message.size());
        os.write((char*)buf, 2);
        
        // Write string
        for(u32 i=0; i<message.size(); i++)
        {
                u16 w = message[i];
                writeU16(buf, w);
                os.write((char*)buf, 2);
        }
        
        // Make data buffer
        std::string s = os.str();
        SharedBuffer<u8> data((u8*)s.c_str(), s.size());
        // Send as reliable
        m_con.Send(peer_id, 0, data, true);
}

void Server::BroadcastChatMessage(const std::wstring &message)
{
        for(core::map<u16, RemoteClient*>::Iterator
                i = m_clients.getIterator();
                i.atEnd() == false; i++)
        {
                // Get client and check that it is valid
                RemoteClient *client = i.getNode()->getValue();
                assert(client->peer_id == i.getNode()->getKey());
                if(client->serialization_version == SER_FMT_VER_INVALID)
                        continue;

                SendChatMessage(client->peer_id, message);
        }
}

void Server::sendRemoveNode(v3s16 p, u16 ignore_id)
{
        // Create packet
        u32 replysize = 8;
        SharedBuffer<u8> reply(replysize);
        writeU16(&reply[0], TOCLIENT_REMOVENODE);
        writeS16(&reply[2], p.X);
        writeS16(&reply[4], p.Y);
        writeS16(&reply[6], p.Z);

        for(core::map<u16, RemoteClient*>::Iterator
                i = m_clients.getIterator();
                i.atEnd() == false; i++)
        {
                // Get client and check that it is valid
                RemoteClient *client = i.getNode()->getValue();
                assert(client->peer_id == i.getNode()->getKey());
                if(client->serialization_version == SER_FMT_VER_INVALID)
                        continue;

                // Don't send if it's the same one
                if(client->peer_id == ignore_id)
                        continue;

                // Send as reliable
                m_con.Send(client->peer_id, 0, reply, true);
        }
}

void Server::sendAddNode(v3s16 p, MapNode n, u16 ignore_id)
{
        for(core::map<u16, RemoteClient*>::Iterator
                i = m_clients.getIterator();
                i.atEnd() == false; i++)
        {
                // Get client and check that it is valid
                RemoteClient *client = i.getNode()->getValue();
                assert(client->peer_id == i.getNode()->getKey());
                if(client->serialization_version == SER_FMT_VER_INVALID)
                        continue;

                // Don't send if it's the same one
                if(client->peer_id == ignore_id)
                        continue;

                // Create packet
                u32 replysize = 8 + MapNode::serializedLength(client->serialization_version);
                SharedBuffer<u8> reply(replysize);
                writeU16(&reply[0], TOCLIENT_ADDNODE);
                writeS16(&reply[2], p.X);
                writeS16(&reply[4], p.Y);
                writeS16(&reply[6], p.Z);
                n.serialize(&reply[8], client->serialization_version);

                // Send as reliable
                m_con.Send(client->peer_id, 0, reply, true);
        }
}

void Server::SendBlockNoLock(u16 peer_id, MapBlock *block, u8 ver)
{
        DSTACK(__FUNCTION_NAME);
        /*
                Create a packet with the block in the right format
        */
        
        std::ostringstream os(std::ios_base::binary);
        block->serialize(os, ver);
        std::string s = os.str();
        SharedBuffer<u8> blockdata((u8*)s.c_str(), s.size());

        u32 replysize = 8 + blockdata.getSize();
        SharedBuffer<u8> reply(replysize);
        v3s16 p = block->getPos();
        writeU16(&reply[0], TOCLIENT_BLOCKDATA);
        writeS16(&reply[2], p.X);
        writeS16(&reply[4], p.Y);
        writeS16(&reply[6], p.Z);
        memcpy(&reply[8], *blockdata, blockdata.getSize());

        /*dstream<<"Sending block ("<<p.X<<","<<p.Y<<","<<p.Z<<")"
                        <<":  \tpacket size: "<<replysize<<std::endl;*/
        
        /*
                Send packet
        */
        m_con.Send(peer_id, 1, reply, true);
}

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

        JMutexAutoLock envlock(m_env_mutex);
        JMutexAutoLock conlock(m_con_mutex);

        //TimeTaker timer("Server::SendBlocks");

        core::array<PrioritySortedBlockTransfer> queue;

        s32 total_sending = 0;

        for(core::map<u16, RemoteClient*>::Iterator
                i = m_clients.getIterator();
                i.atEnd() == false; i++)
        {
                RemoteClient *client = i.getNode()->getValue();
                assert(client->peer_id == i.getNode()->getKey());

                total_sending += client->SendingCount();
                
                if(client->serialization_version == SER_FMT_VER_INVALID)
                        continue;
                
                client->GetNextBlocks(this, dtime, queue);
        }

        // Sort.
        // Lowest priority number comes first.
        // Lowest is most important.
        queue.sort();

        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 = getClient(q.peer_id);

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

                client->SentBlock(q.pos);

                total_sending++;
        }
}


RemoteClient* Server::getClient(u16 peer_id)
{
        DSTACK(__FUNCTION_NAME);
        //JMutexAutoLock lock(m_con_mutex);
        core::map<u16, RemoteClient*>::Node *n;
        n = m_clients.find(peer_id);
        // A client should exist for all peers
        assert(n != NULL);
        return n->getValue();
}

std::wstring Server::getStatusString()
{
        std::wostringstream os(std::ios_base::binary);
        os<<L"# Server: ";
        // Uptime
        os<<L"uptime="<<m_uptime.get();
        // Information about clients
        os<<L", clients={";
        for(core::map<u16, RemoteClient*>::Iterator
                i = m_clients.getIterator();
                i.atEnd() == false; i++)
        {
                // Get client and check that it is valid
                RemoteClient *client = i.getNode()->getValue();
                assert(client->peer_id == i.getNode()->getKey());
                if(client->serialization_version == SER_FMT_VER_INVALID)
                        continue;
                // Get player
                Player *player = m_env.getPlayer(client->peer_id);
                // Get name of player
                std::wstring name = L"unknown";
                if(player != NULL)
                        name = narrow_to_wide(player->getName());
                // Add name to information string
                os<<name<<L",";
        }
        os<<L"}";
        if(((ServerMap*)(&m_env.getMap()))->isSavingEnabled() == false)
                os<<" WARNING: Map saving is disabled."<<std::endl;
        return os.str();
}


void setCreativeInventory(Player *player)
{
        player->resetInventory();
        
        // Give some good picks
        {
                InventoryItem *item = new ToolItem("STPick", 0);
                void* r = player->inventory.addItem("main", item);
                assert(r == NULL);
        }
        {
                InventoryItem *item = new ToolItem("MesePick", 0);
                void* r = player->inventory.addItem("main", item);
                assert(r == NULL);
        }

        /*
                Give materials
        */
        
        // CONTENT_IGNORE-terminated list
        u8 material_items[] = {
                CONTENT_TORCH,
                CONTENT_MUD,
                CONTENT_STONE,
                CONTENT_SAND,
                CONTENT_TREE,
                CONTENT_LEAVES,
                CONTENT_MESE,
                CONTENT_WATERSOURCE,
                CONTENT_CLOUD,
                CONTENT_CHEST,
                CONTENT_FURNACE,
                CONTENT_SIGN_WALL,
                CONTENT_IGNORE
        };
        
        u8 *mip = material_items;
        for(u16 i=0; i<PLAYER_INVENTORY_SIZE; i++)
        {
                if(*mip == CONTENT_IGNORE)
                        break;

                InventoryItem *item = new MaterialItem(*mip, 1);
                player->inventory.addItem("main", item);

                mip++;
        }

#if 0
        assert(USEFUL_CONTENT_COUNT <= PLAYER_INVENTORY_SIZE);
        
        // add torch first
        InventoryItem *item = new MaterialItem(CONTENT_TORCH, 1);
        player->inventory.addItem("main", item);
        
        // Then others
        for(u16 i=0; i<USEFUL_CONTENT_COUNT; i++)
        {
                // Skip some materials
                if(i == CONTENT_WATER || i == CONTENT_TORCH
                        || i == CONTENT_COALSTONE)
                        continue;

                InventoryItem *item = new MaterialItem(i, 1);
                player->inventory.addItem("main", item);
        }
#endif

        /*// Sign
        {
                InventoryItem *item = new MapBlockObjectItem("Sign Example text");
                void* r = player->inventory.addItem("main", item);
                assert(r == NULL);
        }*/
}

Player *Server::emergePlayer(const char *name, const char *password,
                u16 peer_id)
{
        /*
                Try to get an existing player
        */
        Player *player = m_env.getPlayer(name);
        if(player != NULL)
        {
                // If player is already connected, cancel
                if(player->peer_id != 0)
                {
                        dstream<<"emergePlayer(): Player already connected"<<std::endl;
                        return NULL;
                }

                // Got one.
                player->peer_id = peer_id;
                
                // Reset inventory to creative if in creative mode
                if(g_settings.getBool("creative_mode"))
                {
                        setCreativeInventory(player);
                }

                return player;
        }

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

                /*
                        Set player position
                */
                
                dstream<<"Server: Finding spawn place for player \""
                                <<player->getName()<<"\""<<std::endl;

                v2s16 nodepos;
#if 0
                player->setPosition(intToFloat(v3s16(
                                0,
                                45, //64,
                                0
                ), BS));
#endif
#if 1
                s16 groundheight = 0;
#if 1
                // Try to find a good place a few times
                for(s32 i=0; i<1000; i++)
                {
                        s32 range = 1 + i;
                        // We're going to try to throw the player to this position
                        nodepos = v2s16(-range + (myrand()%(range*2)),
                                        -range + (myrand()%(range*2)));
                        v2s16 sectorpos = getNodeSectorPos(nodepos);
                        // Get sector (NOTE: Don't get because it's slow)
                        //m_env.getMap().emergeSector(sectorpos);
                        // Get ground height at point (fallbacks to heightmap function)
                        groundheight = m_env.getServerMap().findGroundLevel(nodepos);
                        // Don't go underwater
                        if(groundheight < WATER_LEVEL)
                        {
                                //dstream<<"-> Underwater"<<std::endl;
                                continue;
                        }
                        // Don't go to high places
                        if(groundheight > WATER_LEVEL + 4)
                        {
                                //dstream<<"-> Underwater"<<std::endl;
                                continue;
                        }

#if 0
// Doesn't work, generating blocks is a bit too complicated for doing here
                        // Get block at point
                        v3s16 nodepos3d;
                        nodepos3d = v3s16(nodepos.X, groundheight+1, nodepos.Y);
                        v3s16 blockpos = getNodeBlockPos(nodepos3d);
                        ((ServerMap*)(&m_env.getMap()))->emergeBlock(blockpos);
                        // Don't go inside ground
                        try{
                                /*v3s16 footpos(nodepos.X, groundheight+1, nodepos.Y);
                                v3s16 headpos(nodepos.X, groundheight+2, nodepos.Y);*/
                                v3s16 footpos = nodepos3d + v3s16(0,0,0);
                                v3s16 headpos = nodepos3d + v3s16(0,1,0);
                                if(m_env.getMap().getNode(footpos).d != CONTENT_AIR
                                        || m_env.getMap().getNode(headpos).d != CONTENT_AIR)
                                {
                                        dstream<<"-> Inside ground"<<std::endl;
                                        // In ground
                                        continue;
                                }
                        }catch(InvalidPositionException &e)
                        {
                                dstream<<"-> Invalid position"<<std::endl;
                                // Ignore invalid position
                                continue;
                        }
#endif

                        // Found a good place
                        dstream<<"Searched through "<<i<<" places."<<std::endl;
                        break;
                }
#endif
                
                // If no suitable place was not found, go above water at least.
                if(groundheight < WATER_LEVEL)
                        groundheight = WATER_LEVEL;

                player->setPosition(intToFloat(v3s16(
                                nodepos.X,
                                groundheight + 5, // Accomodate mud
                                nodepos.Y
                ), BS));
#endif

                /*
                        Add player to environment
                */

                m_env.addPlayer(player);

                /*
                        Add stuff to inventory
                */
                
                if(g_settings.getBool("creative_mode"))
                {
                        setCreativeInventory(player);
                }
                else
                {
                        /*{
                                InventoryItem *item = new ToolItem("WPick", 32000);
                                void* r = player->inventory.addItem("main", item);
                                assert(r == NULL);
                        }*/
                        /*{
                                InventoryItem *item = new MaterialItem(CONTENT_MESE, 6);
                                void* r = player->inventory.addItem("main", item);
                                assert(r == NULL);
                        }
                        {
                                InventoryItem *item = new MaterialItem(CONTENT_COALSTONE, 6);
                                void* r = player->inventory.addItem("main", item);
                                assert(r == NULL);
                        }
                        {
                                InventoryItem *item = new MaterialItem(CONTENT_WOOD, 6);
                                void* r = player->inventory.addItem("main", item);
                                assert(r == NULL);
                        }
                        {
                                InventoryItem *item = new CraftItem("Stick", 4);
                                void* r = player->inventory.addItem("main", item);
                                assert(r == NULL);
                        }
                        {
                                InventoryItem *item = new ToolItem("WPick", 32000);
                                void* r = player->inventory.addItem("main", item);
                                assert(r == NULL);
                        }
                        {
                                InventoryItem *item = new ToolItem("STPick", 32000);
                                void* r = player->inventory.addItem("main", item);
                                assert(r == NULL);
                        }*/
                        /*// Give some lights
                        {
                                InventoryItem *item = new MaterialItem(CONTENT_TORCH, 999);
                                bool r = player->inventory.addItem("main", item);
                                assert(r == true);
                        }
                        // and some signs
                        for(u16 i=0; i<4; i++)
                        {
                                InventoryItem *item = new MapBlockObjectItem("Sign Example text");
                                bool r = player->inventory.addItem("main", item);
                                assert(r == true);
                        }*/
                        /*// Give some other stuff
                        {
                                InventoryItem *item = new MaterialItem(CONTENT_TREE, 999);
                                bool r = player->inventory.addItem("main", item);
                                assert(r == true);
                        }*/
                }

                return player;
                
        } // create new player
}

#if 0
void Server::UpdateBlockWaterPressure(MapBlock *block,
                        core::map<v3s16, MapBlock*> &modified_blocks)
{
        MapVoxelManipulator v(&m_env.getMap());
        v.m_disable_water_climb =
                        g_settings.getBool("disable_water_climb");
        
        VoxelArea area(block->getPosRelative(),
                        block->getPosRelative() + v3s16(1,1,1)*(MAP_BLOCKSIZE-1));

        try
        {
                v.updateAreaWaterPressure(area, m_flow_active_nodes);
        }
        catch(ProcessingLimitException &e)
        {
                dstream<<"Processing limit reached (1)"<<std::endl;
        }
        
        v.blitBack(modified_blocks);
}
#endif

void Server::handlePeerChange(PeerChange &c)
{
        JMutexAutoLock envlock(m_env_mutex);
        JMutexAutoLock conlock(m_con_mutex);
        
        if(c.type == PEER_ADDED)
        {
                /*
                        Add
                */

                // Error check
                core::map<u16, RemoteClient*>::Node *n;
                n = m_clients.find(c.peer_id);
                // The client shouldn't already exist
                assert(n == NULL);

                // Create client
                RemoteClient *client = new RemoteClient();
                client->peer_id = c.peer_id;
                m_clients.insert(client->peer_id, client);

        } // PEER_ADDED
        else if(c.type == PEER_REMOVED)
        {
                /*
                        Delete
                */

                // Error check
                core::map<u16, RemoteClient*>::Node *n;
                n = m_clients.find(c.peer_id);
                // The client should exist
                assert(n != NULL);
                
                // Collect information about leaving in chat
                std::wstring message;
                {
                        std::wstring name = L"unknown";
                        Player *player = m_env.getPlayer(c.peer_id);
                        if(player != NULL)
                                name = narrow_to_wide(player->getName());
                        
                        message += L"*** ";
                        message += name;
                        message += L" left game";
                        if(c.timeout)
                                message += L" (timed out)";
                }

                /*// Delete player
                {
                        m_env.removePlayer(c.peer_id);
                }*/

                // Set player client disconnected
                {
                        Player *player = m_env.getPlayer(c.peer_id);
                        if(player != NULL)
                                player->peer_id = 0;
                }
                
                // Delete client
                delete m_clients[c.peer_id];
                m_clients.remove(c.peer_id);

                // Send player info to all remaining clients
                SendPlayerInfos();
                
                // Send leave chat message to all remaining clients
                BroadcastChatMessage(message);
                
        } // PEER_REMOVED
        else
        {
                assert(0);
        }
}

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

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

                handlePeerChange(c);
        }
}

void dedicated_server_loop(Server &server, bool &kill)
{
        DSTACK(__FUNCTION_NAME);
        
        std::cout<<DTIME<<std::endl;
        std::cout<<"========================"<<std::endl;
        std::cout<<"Running dedicated server"<<std::endl;
        std::cout<<"========================"<<std::endl;
        std::cout<<std::endl;

        for(;;)
        {
                // This is kind of a hack but can be done like this
                // because server.step() is very light
                sleep_ms(30);
                server.step(0.030);

                if(server.getShutdownRequested() || kill)
                {
                        std::cout<<DTIME<<" dedicated_server_loop(): Quitting."<<std::endl;
                        break;
                }

                static int counter = 0;
                counter--;
                if(counter <= 0)
                {
                        counter = 10;

                        core::list<PlayerInfo> list = server.getPlayerInfo();
                        core::list<PlayerInfo>::Iterator i;
                        static u32 sum_old = 0;
                        u32 sum = PIChecksum(list);
                        if(sum != sum_old)
                        {
                                std::cout<<DTIME<<"Player info:"<<std::endl;
                                for(i=list.begin(); i!=list.end(); i++)
                                {
                                        i->PrintLine(&std::cout);
                                }
                        }
                        sum_old = sum;
                }
        }
}