[oweals/minetest.git] / src / server.cpp

/*
Minetest-c55
Copyright (C) 2010-2011 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"
#include "config.h"
#include "servercommand.h"
#include "filesys.h"
#include "content_mapnode.h"
#include "content_craft.h"
#include "content_nodemeta.h"
#include "mapblock.h"
#include "serverobject.h"
#include "settings.h"
#include "profiler.h"
#include "log.h"
#include "script.h"
#include "scriptapi.h"
#include "nodedef.h"
#include "tooldef.h"
#include "craftdef.h"

#define PP(x) "("<<(x).X<<","<<(x).Y<<","<<(x).Z<<")"

#define BLOCK_EMERGE_FLAG_FROMDISK (1<<0)

class MapEditEventIgnorer
{
public:
        MapEditEventIgnorer(bool *flag):
                m_flag(flag)
        {
                if(*m_flag == false)
                        *m_flag = true;
                else
                        m_flag = NULL;
        }

        ~MapEditEventIgnorer()
        {
                if(m_flag)
                {
                        assert(*m_flag);
                        *m_flag = false;
                }
        }
        
private:
        bool *m_flag;
};

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

        log_register_thread("ServerThread");

        DSTACK(__FUNCTION_NAME);

        BEGIN_DEBUG_EXCEPTION_HANDLER

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

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

        return NULL;
}

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

        log_register_thread("EmergeThread");

        DSTACK(__FUNCTION_NAME);

        BEGIN_DEBUG_EXCEPTION_HANDLER

        bool enable_mapgen_debug_info = g_settings->getBool("enable_mapgen_debug_info");
        
        /*
                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;
                v2s16 p2d(p.X,p.Z);

                /*
                        Do not generate 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;
                        
                //infostream<<"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 only_from_disk = 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)
                                        only_from_disk = false;
                                
                        }
                }
                
                if(enable_mapgen_debug_info)
                        infostream<<"EmergeThread: p="
                                        <<"("<<p.X<<","<<p.Y<<","<<p.Z<<") "
                                        <<"only_from_disk="<<only_from_disk<<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;
                
                /*
                        Fetch block from map or generate a single block
                */
                {
                        JMutexAutoLock envlock(m_server->m_env_mutex);
                        
                        // Load sector if it isn't loaded
                        if(map.getSectorNoGenerateNoEx(p2d) == NULL)
                                //map.loadSectorFull(p2d);
                                map.loadSectorMeta(p2d);

                        block = map.getBlockNoCreateNoEx(p);
                        if(!block || block->isDummy() || !block->isGenerated())
                        {
                                if(enable_mapgen_debug_info)
                                        infostream<<"EmergeThread: not in memory, loading"<<std::endl;

                                // Get, load or create sector
                                /*ServerMapSector *sector =
                                                (ServerMapSector*)map.createSector(p2d);*/

                                // Load/generate block

                                /*block = map.emergeBlock(p, sector, changed_blocks,
                                                lighting_invalidated_blocks);*/

                                block = map.loadBlock(p);
                                
                                if(only_from_disk == false)
                                {
                                        if(block == NULL || block->isGenerated() == false)
                                        {
                                                if(enable_mapgen_debug_info)
                                                        infostream<<"EmergeThread: generating"<<std::endl;
                                                block = map.generateBlock(p, modified_blocks);
                                        }
                                }

                                if(enable_mapgen_debug_info)
                                        infostream<<"EmergeThread: ended up with: "
                                                        <<analyze_block(block)<<std::endl;

                                if(block == NULL)
                                {
                                        got_block = false;
                                }
                                else
                                {
                                        /*
                                                Ignore map edit events, they will not need to be
                                                sent to anybody because the block hasn't been sent
                                                to anybody
                                        */
                                        MapEditEventIgnorer ign(&m_server->m_ignore_map_edit_events);
                                        
                                        // Activate objects and stuff
                                        m_server->m_env->activateBlock(block, 3600);
                                }
                        }
                        else
                        {
                                /*if(block->getLightingExpired()){
                                        lighting_invalidated_blocks[block->getPos()] = block;
                                }*/
                        }

                        // TODO: Some additional checking and lighting updating,
                        //       see emergeBlock
                }

                {//envlock
                JMutexAutoLock envlock(m_server->m_env_mutex);
                
                if(got_block)
                {
                        /*
                                Collect a list of blocks that have been modified in
                                addition to the fetched one.
                        */

#if 0
                        if(lighting_invalidated_blocks.size() > 0)
                        {
                                /*infostream<<"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);
                        }
#endif
                }
                // 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(errorstream)

        return NULL;
}

void RemoteClient::GetNextBlocks(Server *server, float dtime,
                core::array<PrioritySortedBlockTransfer> &dest)
{
        DSTACK(__FUNCTION_NAME);
        
        /*u32 timer_result;
        TimeTaker timer("RemoteClient::GetNextBlocks", &timer_result);*/
        
        // Increment timers
        m_nothing_to_send_pause_timer -= dtime;
        m_nearest_unsent_reset_timer += dtime;
        
        if(m_nothing_to_send_pause_timer >= 0)
        {
                return;
        }

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

        //TimeTaker timer("RemoteClient::GetNextBlocks");
        
        Player *player = server->m_env->getPlayer(peer_id);

        assert(player != NULL);

        v3f playerpos = player->getPosition();
        v3f playerspeed = player->getSpeed();
        v3f playerspeeddir(0,0,0);
        if(playerspeed.getLength() > 1.0*BS)
                playerspeeddir = playerspeed / playerspeed.getLength();
        // Predict to next block
        v3f playerpos_predicted = playerpos + playerspeeddir*MAP_BLOCKSIZE*BS;

        v3s16 center_nodepos = floatToInt(playerpos_predicted, BS);

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

        /*infostream<<"camera_dir=("<<camera_dir.X<<","<<camera_dir.Y<<","
                        <<camera_dir.Z<<")"<<std::endl;*/

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

        /*infostream<<"m_nearest_unsent_reset_timer="
                        <<m_nearest_unsent_reset_timer<<std::endl;*/
                        
        // Reset periodically to workaround for some bugs or stuff
        if(m_nearest_unsent_reset_timer > 20.0)
        {
                m_nearest_unsent_reset_timer = 0;
                m_nearest_unsent_d = 0;
                //infostream<<"Resetting m_nearest_unsent_d for "
                //              <<server->getPlayerName(peer_id)<<std::endl;
        }

        //s16 last_nearest_unsent_d = m_nearest_unsent_d;
        s16 d_start = m_nearest_unsent_d;

        //infostream<<"d_start="<<d_start<<std::endl;

        u16 max_simul_sends_setting = g_settings->getU16
                        ("max_simultaneous_block_sends_per_client");
        u16 max_simul_sends_usually = max_simul_sends_setting;

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

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

        s16 d_max = g_settings->getS16("max_block_send_distance");
        s16 d_max_gen = g_settings->getS16("max_block_generate_distance");
        
        // Don't loop very much at a time
        s16 max_d_increment_at_time = 2;
        if(d_max > d_start + max_d_increment_at_time)
                d_max = d_start + max_d_increment_at_time;
        /*if(d_max_gen > d_start+2)
                d_max_gen = d_start+2;*/
        
        //infostream<<"Starting from "<<d_start<<std::endl;

        s32 nearest_emerged_d = -1;
        s32 nearest_emergefull_d = -1;
        s32 nearest_sent_d = -1;
        bool queue_is_full = false;
        
        s16 d;
        for(d = d_start; d <= d_max; d++)
        {
                /*errorstream<<"checking d="<<d<<" for "
                                <<server->getPlayerName(peer_id)<<std::endl;*/
                //infostream<<"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.
                        */
                        
                        // Start with the usual maximum
                        u16 max_simul_dynamic = max_simul_sends_usually;
                        
                        // If block is very close, allow full maximum
                        if(d <= BLOCK_SEND_DISABLE_LIMITS_MAX_D)
                                max_simul_dynamic = max_simul_sends_setting;

                        // Don't select too many blocks for sending
                        if(num_blocks_selected >= max_simul_dynamic)
                        {
                                queue_is_full = true;
                                goto queue_full_break;
                        }
                        
                        // Don't send blocks that are currently being transferred
                        if(m_blocks_sending.find(p) != 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 1/2
                                if(abs(p.Y - center.Y) > d_max / 2)
                                        continue;
                        }

#if 0
                        /*
                                If block is far away, don't generate it unless it is
                                near ground level.
                        */
                        if(d >= 4)
                        {
        #if 1
                                // Block center y in nodes
                                f32 y = (f32)(p.Y * MAP_BLOCKSIZE + MAP_BLOCKSIZE/2);
                                // Don't generate if it's very high or very low
                                if(y < -64 || y > 64)
                                        generate = false;
        #endif
        #if 0
                                v2s16 p2d_nodes_center(
                                        MAP_BLOCKSIZE*p.X,
                                        MAP_BLOCKSIZE*p.Z);
                                
                                // Get ground height in nodes
                                s16 gh = server->m_env->getServerMap().findGroundLevel(
                                                p2d_nodes_center);

                                // If differs a lot, don't generate
                                if(fabs(gh - y) > MAP_BLOCKSIZE*2)
                                        generate = false;
                                        // Actually, don't even send it
                                        //continue;
        #endif
                        }
#endif

                        //infostream<<"d="<<d<<std::endl;
#if 1
                        /*
                                Don't generate or send if not in sight
                                FIXME This only works if the client uses a small enough
                                FOV setting. The default of 72 degrees is fine.
                        */

                        float camera_fov = (72.0*PI/180) * 4./3.;
                        if(isBlockInSight(p, camera_pos, camera_dir, camera_fov, 10000*BS) == false)
                        {
                                continue;
                        }
#endif
                        /*
                                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)
                        {
                                // Reset usage timer, this block will be of use in the future.
                                block->resetUsageTimer();

                                // Block is dummy if data doesn't exist.
                                // It means it has been not found from disk and not generated
                                if(block->isDummy())
                                {
                                        surely_not_found_on_disk = true;
                                }
                                
                                // Block is valid if lighting is up-to-date and data exists
                                if(block->isValid() == false)
                                {
                                        block_is_invalid = true;
                                }
                                
                                /*if(block->isFullyGenerated() == false)
                                {
                                        block_is_invalid = true;
                                }*/

#if 0
                                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;
#endif
                                if(block->isGenerated() == false)
                                        block_is_invalid = true;
#if 1
                                /*
                                        If block is not close, don't send it unless it is near
                                        ground level.

                                        Block is near ground level if night-time mesh
                                        differs from day-time mesh.
                                */
                                if(d >= 4)
                                {
                                        if(block->dayNightDiffed() == false)
                                                continue;
                                }
#endif
                        }

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

                        /*
                                Add inexistent block to emerge queue.
                        */
                        if(block == NULL || surely_not_found_on_disk || block_is_invalid)
                        {
                                //TODO: Get value from somewhere
                                // Allow only one block in emerge queue
                                //if(server->m_emerge_queue.peerItemCount(peer_id) < 1)
                                // Allow two blocks in queue per client
                                //if(server->m_emerge_queue.peerItemCount(peer_id) < 2)
                                s32 max_emerge = 25;
                                // Make it more responsive when needing to generate stuff
                                if(surely_not_found_on_disk)
                                        max_emerge = 5;
                                if(server->m_emerge_queue.peerItemCount(peer_id) < max_emerge)
                                {
                                        //infostream<<"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();

                                        if(nearest_emerged_d == -1)
                                                nearest_emerged_d = d;
                                } else {
                                        if(nearest_emergefull_d == -1)
                                                nearest_emergefull_d = d;
                                }
                                
                                // get next one.
                                continue;
                        }

                        if(nearest_sent_d == -1)
                                nearest_sent_d = d;

                        /*
                                Add block to send queue
                        */

                        /*errorstream<<"sending from d="<<d<<" to "
                                        <<server->getPlayerName(peer_id)<<std::endl;*/

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

                        dest.push_back(q);

                        num_blocks_selected += 1;
                }
        }
queue_full_break:

        //infostream<<"Stopped at "<<d<<std::endl;
        
        // If nothing was found for sending and nothing was queued for
        // emerging, continue next time browsing from here
        if(nearest_emerged_d != -1){
                new_nearest_unsent_d = nearest_emerged_d;
        } else if(nearest_emergefull_d != -1){
                new_nearest_unsent_d = nearest_emergefull_d;
        } else {
                if(d > g_settings->getS16("max_block_send_distance")){
                        new_nearest_unsent_d = 0;
                        m_nothing_to_send_pause_timer = 2.0;
                        /*infostream<<"GetNextBlocks(): d wrapped around for "
                                        <<server->getPlayerName(peer_id)
                                        <<"; setting to 0 and pausing"<<std::endl;*/
                } else {
                        if(nearest_sent_d != -1)
                                new_nearest_unsent_d = nearest_sent_d;
                        else
                                new_nearest_unsent_d = d;
                }
        }

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

        /*timer_result = timer.stop(true);
        if(timer_result != 0)
                infostream<<"GetNextBlocks duration: "<<timer_result<<" (!=0)"<<std::endl;*/
}

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)
        {
                infostream<<"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:
                        u16 peer_id
                        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 (dummy, for compatibility)
        */

        // Write block count
        writeU16(buf, 0);
        os.write((char*)buf, 2);

        /*
                Send data
        */
        
        //infostream<<"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
        {
                /*infostream<<"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
                infostream<<"RemoteClient::SentBlock(): Sent block"
                                " already in m_blocks_sending"<<std::endl;
}

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

struct ModSpec
{
        std::string name;
        std::string path;

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

static core::list<ModSpec> getMods(core::list<std::string> &modspaths)
{
        core::list<ModSpec> mods;
        for(core::list<std::string>::Iterator i = modspaths.begin();
                        i != modspaths.end(); i++){
                std::string modspath = *i;
                std::vector<fs::DirListNode> dirlist = fs::GetDirListing(modspath);
                for(u32 j=0; j<dirlist.size(); j++){
                        if(!dirlist[j].dir)
                                continue;
                        std::string modname = dirlist[j].name;
                        std::string modpath = modspath + DIR_DELIM + modname;
                        mods.push_back(ModSpec(modname, modpath));
                }
        }
        return mods;
}

/*
        Server
*/

Server::Server(
                std::string mapsavedir,
                std::string configpath
        ):
        m_env(NULL),
        m_con(PROTOCOL_ID, 512, CONNECTION_TIMEOUT, this),
        m_authmanager(mapsavedir+DIR_DELIM+"auth.txt"),
        m_banmanager(mapsavedir+DIR_DELIM+"ipban.txt"),
        m_lua(NULL),
        m_toolmgr(createToolDefManager()),
        m_nodedef(createNodeDefManager()),
        m_craftdef(createCraftDefManager()),
        m_thread(this),
        m_emergethread(this),
        m_time_counter(0),
        m_time_of_day_send_timer(0),
        m_uptime(0),
        m_mapsavedir(mapsavedir),
        m_configpath(configpath),
        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;

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

        infostream<<"m_nodedef="<<m_nodedef<<std::endl;
        
        // Initialize default node definitions
        content_mapnode_init(m_nodedef);
        
        // Add default global mod path
        m_modspaths.push_back(porting::path_data + DIR_DELIM + "mods");

        // Initialize scripting
        
        infostream<<"Server: Initializing scripting"<<std::endl;
        m_lua = script_init();
        assert(m_lua);
        // Export API
        scriptapi_export(m_lua, this);
        // Load and run scripts
        core::list<ModSpec> mods = getMods(m_modspaths);
        for(core::list<ModSpec>::Iterator i = mods.begin();
                        i != mods.end(); i++){
                ModSpec mod = *i;
                infostream<<"Server: Loading mod \""<<mod.name<<"\""<<std::endl;
                std::string scriptpath = mod.path + DIR_DELIM + "init.lua";
                bool success = script_load(m_lua, scriptpath.c_str());
                if(!success){
                        errorstream<<"Server: Failed to load and run "
                                        <<scriptpath<<std::endl;
                        assert(0);
                }
        }
        
        // Initialize Environment
        
        m_env = new ServerEnvironment(new ServerMap(mapsavedir, this), m_lua, this);

        // Give environment reference to scripting api
        scriptapi_add_environment(m_lua, m_env);
        
        // Register us to receive map edit events
        m_env->getMap().addEventReceiver(this);

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

        // Load players
        infostream<<"Server: Loading players"<<std::endl;
        m_env->deSerializePlayers(m_mapsavedir);
}

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

        /*
                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;

                        try{
                                SendChatMessage(client->peer_id, line);
                        }
                        catch(con::PeerNotFoundException &e)
                        {}
                }
        }
        
        {
                JMutexAutoLock envlock(m_env_mutex);

                /*
                        Save players
                */
                infostream<<"Server: Saving players"<<std::endl;
                m_env->serializePlayers(m_mapsavedir);

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

        // Delete Environment
        delete m_env;

        delete m_toolmgr;
        delete m_nodedef;
        
        // Deinitialize scripting
        infostream<<"Server: Deinitializing scripting"<<std::endl;
        script_deinit(m_lua);
}

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();
        
        infostream<<"Server: Started on port "<<port<<std::endl;
}

void Server::stop()
{
        DSTACK(__FUNCTION_NAME);
        
        infostream<<"Server: Stopping and waiting threads"<<std::endl;

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

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

void Server::AsyncRunStep()
{
        DSTACK(__FUNCTION_NAME);
        
        g_profiler->add("Server::AsyncRunStep (num)", 1);
        
        float dtime;
        {
                JMutexAutoLock lock1(m_step_dtime_mutex);
                dtime = m_step_dtime;
        }
        
        {
                ScopeProfiler sp(g_profiler, "Server: sel and send blocks to clients");
                // Send blocks to clients
                SendBlocks(dtime);
        }
        
        if(dtime < 0.001)
                return;
        
        g_profiler->add("Server::AsyncRunStep with dtime (num)", 1);

        //infostream<<"Server steps "<<dtime<<std::endl;
        //infostream<<"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);
        }
        
        {
                // Process connection's timeouts
                JMutexAutoLock lock2(m_con_mutex);
                ScopeProfiler sp(g_profiler, "Server: connection timeout processing");
                m_con.RunTimeouts(dtime);
        }
        
        {
                // This has to be called so that the client list gets synced
                // with the peer list of the connection
                handlePeerChanges();
        }

        /*
                Update m_time_of_day and overall game time
        */
        {
                JMutexAutoLock envlock(m_env_mutex);

                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_env->setTimeOfDay((m_env->getTimeOfDay() + units) % 24000);
                
                //infostream<<"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_env->getTimeOfDay());
                                // Send as reliable
                                m_con.Send(client->peer_id, 0, data, true);
                        }
                }
        }

        {
                JMutexAutoLock lock(m_env_mutex);
                // Step environment
                ScopeProfiler sp(g_profiler, "SEnv step");
                ScopeProfiler sp2(g_profiler, "SEnv step avg", SPT_AVG);
                m_env->step(dtime);
        }
                
        const float map_timer_and_unload_dtime = 2.92;
        if(m_map_timer_and_unload_interval.step(dtime, map_timer_and_unload_dtime))
        {
                JMutexAutoLock lock(m_env_mutex);
                // Run Map's timers and unload unused data
                ScopeProfiler sp(g_profiler, "Server: map timer and unload");
                m_env->getMap().timerUpdate(map_timer_and_unload_dtime,
                                g_settings->getFloat("server_unload_unused_data_timeout"));
        }
        
        /*
                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);

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

                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);
                        
                        if(m_clients.size() != 0)
                                infostream<<"Players:"<<std::endl;
                        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);
                                if(player==NULL)
                                        continue;
                                infostream<<"* "<<player->getName()<<"\t";
                                client->PrintInfo(infostream);
                        }
                }
        }

        //if(g_settings->getBool("enable_experimental"))
        {

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

                ScopeProfiler sp(g_profiler, "Server: checking added and deleted objs");

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

                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)
                        {
                                // This can happen if the client timeouts somehow
                                /*infostream<<"WARNING: "<<__FUNCTION_NAME<<": Client "
                                                <<client->peer_id
                                                <<" has no associated player"<<std::endl;*/
                                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)
                        {
                                //infostream<<"active objects: none changed"<<std::endl;
                                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)
                                        infostream<<"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);
                                
                                if(obj)
                                        data_buffer.append(serializeLongString(
                                                        obj->getClientInitializationData()));
                                else
                                        data_buffer.append(serializeLongString(""));

                                // 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);

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

#if 0
                /*
                        Collect a list of all the objects known by the clients
                        and report it back to the environment.
                */

                core::map<u16, bool> all_known_objects;

                for(core::map<u16, RemoteClient*>::Iterator
                        i = m_clients.getIterator();
                        i.atEnd() == false; i++)
                {
                        RemoteClient *client = i.getNode()->getValue();
                        // Go through all known objects of client
                        for(core::map<u16, bool>::Iterator
                                        i = client->m_known_objects.getIterator();
                                        i.atEnd()==false; i++)
                        {
                                u16 id = i.getNode()->getKey();
                                all_known_objects[id] = true;
                        }
                }
                
                m_env->setKnownActiveObjects(whatever);
#endif

        }

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

                //ScopeProfiler sp(g_profiler, "Server: sending object messages");

                // 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)
                        {
                                infostream<<"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.
        */
        {
                // Don't send too many at a time
                //u32 count = 0;

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

                bool got_any_events = false;

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

                while(m_unsent_map_edit_queue.size() != 0)
                {
                        got_any_events = true;

                        MapEditEvent* event = m_unsent_map_edit_queue.pop_front();
                        
                        // Players far away from the change are stored here.
                        // Instead of sending the changes, MapBlocks are set not sent
                        // for them.
                        core::list<u16> far_players;

                        if(event->type == MEET_ADDNODE)
                        {
                                //infostream<<"Server: MEET_ADDNODE"<<std::endl;
                                prof.add("MEET_ADDNODE", 1);
                                if(disable_single_change_sending)
                                        sendAddNode(event->p, event->n, event->already_known_by_peer,
                                                        &far_players, 5);
                                else
                                        sendAddNode(event->p, event->n, event->already_known_by_peer,
                                                        &far_players, 30);
                        }
                        else if(event->type == MEET_REMOVENODE)
                        {
                                //infostream<<"Server: MEET_REMOVENODE"<<std::endl;
                                prof.add("MEET_REMOVENODE", 1);
                                if(disable_single_change_sending)
                                        sendRemoveNode(event->p, event->already_known_by_peer,
                                                        &far_players, 5);
                                else
                                        sendRemoveNode(event->p, event->already_known_by_peer,
                                                        &far_players, 30);
                        }
                        else if(event->type == MEET_BLOCK_NODE_METADATA_CHANGED)
                        {
                                infostream<<"Server: MEET_BLOCK_NODE_METADATA_CHANGED"<<std::endl;
                                prof.add("MEET_BLOCK_NODE_METADATA_CHANGED", 1);
                                setBlockNotSent(event->p);
                        }
                        else if(event->type == MEET_OTHER)
                        {
                                infostream<<"Server: MEET_OTHER"<<std::endl;
                                prof.add("MEET_OTHER", 1);
                                for(core::map<v3s16, bool>::Iterator
                                                i = event->modified_blocks.getIterator();
                                                i.atEnd()==false; i++)
                                {
                                        v3s16 p = i.getNode()->getKey();
                                        setBlockNotSent(p);
                                }
                        }
                        else
                        {
                                prof.add("unknown", 1);
                                infostream<<"WARNING: Server: Unknown MapEditEvent "
                                                <<((u32)event->type)<<std::endl;
                        }
                        
                        /*
                                Set blocks not sent to far players
                        */
                        if(far_players.size() > 0)
                        {
                                // Convert list format to that wanted by SetBlocksNotSent
                                core::map<v3s16, MapBlock*> modified_blocks2;
                                for(core::map<v3s16, bool>::Iterator
                                                i = event->modified_blocks.getIterator();
                                                i.atEnd()==false; i++)
                                {
                                        v3s16 p = i.getNode()->getKey();
                                        modified_blocks2.insert(p,
                                                        m_env->getMap().getBlockNoCreateNoEx(p));
                                }
                                // Set blocks not sent
                                for(core::list<u16>::Iterator
                                                i = far_players.begin();
                                                i != far_players.end(); i++)
                                {
                                        u16 peer_id = *i;
                                        RemoteClient *client = getClient(peer_id);
                                        if(client==NULL)
                                                continue;
                                        client->SetBlocksNotSent(modified_blocks2);
                                }
                        }

                        delete event;

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

                if(got_any_events)
                {
                        infostream<<"Server: MapEditEvents:"<<std::endl;
                        prof.print(infostream);
                }
                
        }

        /*
                Send object positions
        */
        {
                float &counter = m_objectdata_timer;
                counter += dtime;
                if(counter >= g_settings->getFloat("objectdata_interval"))
                {
                        JMutexAutoLock lock1(m_env_mutex);
                        JMutexAutoLock lock2(m_con_mutex);

                        //ScopeProfiler sp(g_profiler, "Server: sending player positions");

                        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, players and auth stuff
        {
                float &counter = m_savemap_timer;
                counter += dtime;
                if(counter >= g_settings->getFloat("server_map_save_interval"))
                {
                        counter = 0.0;

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

                        // Auth stuff
                        if(m_authmanager.isModified())
                                m_authmanager.save();

                        //Bann stuff
                        if(m_banmanager.isModified())
                                m_banmanager.save();
                        
                        // Map
                        JMutexAutoLock lock(m_env_mutex);

                        /*// Unload unused data (delete from memory)
                        m_env->getMap().unloadUnusedData(
                                        g_settings->getFloat("server_unload_unused_sectors_timeout"));
                                        */
                        /*u32 deleted_count = m_env->getMap().unloadUnusedData(
                                        g_settings->getFloat("server_unload_unused_sectors_timeout"));
                                        */

                        // Save only changed parts
                        m_env->getMap().save(true);

                        /*if(deleted_count > 0)
                        {
                                infostream<<"Server: Unloaded "<<deleted_count
                                                <<" blocks from memory"<<std::endl;
                        }*/

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

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

                // 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)
        {
                infostream<<"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);

                infostream<<"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);
        
        try{
                Address address = m_con.GetPeerAddress(peer_id);

                // drop player if is ip is banned
                if(m_banmanager.isIpBanned(address.serializeString())){
                        SendAccessDenied(m_con, peer_id,
                                        L"Your ip is banned. Banned name was "
                                        +narrow_to_wide(m_banmanager.getBanName(
                                                address.serializeString())));
                        m_con.DeletePeer(peer_id);
                        return;
                }
        }
        catch(con::PeerNotFoundException &e)
        {
                infostream<<"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
                // [23] u8[28] password <--- can be sent without this, from old versions

                if(datasize < 2+1+PLAYERNAME_SIZE)
                        return;

                infostream<<"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)
                {
                        infostream<<"Server: Cannot negotiate "
                                        "serialization version with peer "
                                        <<peer_id<<std::endl;
                        SendAccessDenied(m_con, peer_id,
                                        L"Your client is too old (map format)");
                        return;
                }
                
                /*
                        Read and check network protocol version
                */

                u16 net_proto_version = 0;
                if(datasize >= 2+1+PLAYERNAME_SIZE+PASSWORD_SIZE+2)
                {
                        net_proto_version = readU16(&data[2+1+PLAYERNAME_SIZE+PASSWORD_SIZE]);
                }

                getClient(peer_id)->net_proto_version = net_proto_version;

                if(net_proto_version == 0)
                {
                        SendAccessDenied(m_con, peer_id,
                                        L"Your client is too old. Please upgrade.");
                        return;
                }
                
                /* Uhh... this should actually be a warning but let's do it like this */
                if(g_settings->getBool("strict_protocol_version_checking"))
                {
                        if(net_proto_version < PROTOCOL_VERSION)
                        {
                                SendAccessDenied(m_con, peer_id,
                                                L"Your client is too old. Please upgrade.");
                                return;
                        }
                }

                /*
                        Set up player
                */
                
                // Get player name
                char playername[PLAYERNAME_SIZE];
                for(u32 i=0; i<PLAYERNAME_SIZE-1; i++)
                {
                        playername[i] = data[3+i];
                }
                playername[PLAYERNAME_SIZE-1] = 0;
                
                if(playername[0]=='\0')
                {
                        infostream<<"Server: Player has empty name"<<std::endl;
                        SendAccessDenied(m_con, peer_id,
                                        L"Empty name");
                        return;
                }

                if(string_allowed(playername, PLAYERNAME_ALLOWED_CHARS)==false)
                {
                        infostream<<"Server: Player has invalid name"<<std::endl;
                        SendAccessDenied(m_con, peer_id,
                                        L"Name contains unallowed characters");
                        return;
                }

                // Get password
                char password[PASSWORD_SIZE];
                if(datasize < 2+1+PLAYERNAME_SIZE+PASSWORD_SIZE)
                {
                        // old version - assume blank password
                        password[0] = 0;
                }
                else
                {
                                for(u32 i=0; i<PASSWORD_SIZE-1; i++)
                                {
                                        password[i] = data[23+i];
                                }
                                password[PASSWORD_SIZE-1] = 0;
                }
                
                std::string checkpwd;
                if(m_authmanager.exists(playername))
                {
                        checkpwd = m_authmanager.getPassword(playername);
                }
                else
                {
                        checkpwd = g_settings->get("default_password");
                }
                
                /*infostream<<"Server: Client gave password '"<<password
                                <<"', the correct one is '"<<checkpwd<<"'"<<std::endl;*/
                
                if(password != checkpwd && m_authmanager.exists(playername))
                {
                        infostream<<"Server: peer_id="<<peer_id
                                        <<": supplied invalid password for "
                                        <<playername<<std::endl;
                        SendAccessDenied(m_con, peer_id, L"Invalid password");
                        return;
                }
                
                // Add player to auth manager
                if(m_authmanager.exists(playername) == false)
                {
                        infostream<<"Server: adding player "<<playername
                                        <<" to auth manager"<<std::endl;
                        m_authmanager.add(playername);
                        m_authmanager.setPassword(playername, checkpwd);
                        m_authmanager.setPrivs(playername,
                                        stringToPrivs(g_settings->get("default_privs")));
                        m_authmanager.save();
                }
                
                // Enforce user limit.
                // Don't enforce for users that have some admin right
                if(m_clients.size() >= g_settings->getU16("max_users") &&
                                (m_authmanager.getPrivs(playername)
                                        & (PRIV_SERVER|PRIV_BAN|PRIV_PRIVS)) == 0 &&
                                playername != g_settings->get("name"))
                {
                        SendAccessDenied(m_con, peer_id, L"Too many users.");
                        return;
                }

                // Get player
                Player *player = emergePlayer(playername, password, peer_id);

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

                /*
                        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);
                }

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

                return;
        }

        if(command == TOSERVER_INIT2)
        {
                infostream<<"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 tool definitions
                SendToolDef(m_con, peer_id, m_toolmgr);
                
                // Send node definitions
                SendNodeDef(m_con, peer_id, m_nodedef);
                
                // Send textures
                SendTextures(peer_id);
                
                // Send player info to all players
                SendPlayerInfos();

                // Send inventory to player
                UpdateCrafting(peer_id);
                SendInventory(peer_id);

                // Send player items to all players
                SendPlayerItems();

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

                // Send HP
                SendPlayerHP(player);
                
                // Send time of day
                {
                        SharedBuffer<u8> data = makePacket_TOCLIENT_TIME_OF_DAY(
                                        m_env->getTimeOfDay());
                        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);
                }
                
                // Warnings about protocol version can be issued here
                if(getClient(peer_id)->net_proto_version < PROTOCOL_VERSION)
                {
                        SendChatMessage(peer_id, L"# Server: WARNING: YOUR CLIENT IS OLD AND MAY WORK PROPERLY WITH THIS SERVER");
                }

                /*
                        Check HP, respawn if necessary
                */
                HandlePlayerHP(player, 0);

                /*
                        Print out action
                */
                {
                        std::ostringstream os(std::ios_base::binary);
                        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());
                                if(client->serialization_version == SER_FMT_VER_INVALID)
                                        continue;
                                // Get player
                                Player *player = m_env->getPlayer(client->peer_id);
                                if(!player)
                                        continue;
                                // Get name of player
                                os<<player->getName()<<" ";
                        }

                        actionstream<<player->getName()<<" joins game. List of players: "
                                        <<os.str()<<std::endl;
                }

                return;
        }

        if(peer_ser_ver == SER_FMT_VER_INVALID)
        {
                infostream<<"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){
                infostream<<"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);
                
                /*infostream<<"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]);
                        /*infostream<<"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]);
                        /*infostream<<"Server: DELETEDBLOCKS ("
                                        <<p.X<<","<<p.Y<<","<<p.Z<<")"<<std::endl;*/
                        RemoteClient *client = getClient(peer_id);
                        client->SetBlockNotSent(p);
                }
        }
        else if(command == TOSERVER_CLICK_OBJECT)
        {
                infostream<<"Server: CLICK_OBJECT not supported anymore"<<std::endl;
                return;
        }
        else if(command == TOSERVER_CLICK_ACTIVEOBJECT)
        {
                if(datasize < 7)
                        return;

                if((getPlayerPrivs(player) & PRIV_BUILD) == 0)
                        return;

                /*
                        length: 7
                        [0] u16 command
                        [2] u8 button (0=left, 1=right)
                        [3] u16 id
                        [5] u16 item
                */
                u8 button = readU8(&data[2]);
                u16 id = readS16(&data[3]);
                u16 item_i = readU16(&data[5]);
        
                ServerActiveObject *obj = m_env->getActiveObject(id);

                if(obj == NULL)
                {
                        infostream<<"Server: CLICK_ACTIVEOBJECT: object not found"
                                        <<std::endl;
                        return;
                }

                // Skip if object has been removed
                if(obj->m_removed)
                        return;
                
                //TODO: Check that object is reasonably close
        
                // Get ServerRemotePlayer
                ServerRemotePlayer *srp = (ServerRemotePlayer*)player;

                // Update wielded item
                srp->wieldItem(item_i);
                
                // Left click, pick/punch
                if(button == 0)
                {
                        actionstream<<player->getName()<<" punches object "
                                        <<obj->getId()<<std::endl;
                        
                        // Do stuff
                        obj->punch(srp);
                        
#if 0
                        /*
                                Try creating inventory item
                        */
                        InventoryItem *item = obj->createPickedUpItem();
                        
                        if(item)
                        {
                                InventoryList *ilist = player->inventory.getList("main");
                                if(ilist != NULL)
                                {
                                        actionstream<<player->getName()<<" picked up "
                                                        <<item->getName()<<std::endl;
                                        if(g_settings->getBool("creative_mode") == false)
                                        {
                                                // Skip if inventory has no free space
                                                if(ilist->roomForItem(item) == false)
                                                {
                                                        infostream<<"Player inventory has no free space"<<std::endl;
                                                        return;
                                                }

                                                // Add to inventory and send inventory
                                                ilist->addItem(item);
                                                UpdateCrafting(player->peer_id);
                                                SendInventory(player->peer_id);
                                        }

                                        // Remove object from environment
                                        obj->m_removed = true;
                                }
                        }
                        else
                        {
                                /*
                                        Item cannot be picked up. Punch it instead.
                                */

                                actionstream<<player->getName()<<" punches object "
                                                <<obj->getId()<<std::endl;

                                ToolItem *titem = NULL;
                                std::string toolname = "";

                                InventoryList *mlist = player->inventory.getList("main");
                                if(mlist != NULL)
                                {
                                        InventoryItem *item = mlist->getItem(item_i);
                                        if(item && (std::string)item->getName() == "ToolItem")
                                        {
                                                titem = (ToolItem*)item;
                                                toolname = titem->getToolName();
                                        }
                                }

                                v3f playerpos = player->getPosition();
                                v3f objpos = obj->getBasePosition();
                                v3f dir = (objpos - playerpos).normalize();
                                
                                u16 wear = obj->punch(toolname, dir, player->getName());
                                
                                if(titem)
                                {
                                        bool weared_out = titem->addWear(wear);
                                        if(weared_out)
                                                mlist->deleteItem(item_i);
                                        SendInventory(player->peer_id);
                                }
                        }
#endif
                }
                // Right click, do something with object
                if(button == 1)
                {
                        actionstream<<player->getName()<<" right clicks object "
                                        <<obj->getId()<<std::endl;

                        // Do stuff
                        obj->rightClick(srp);
                }

                /*
                        Update player state to client
                */
                SendPlayerHP(player);
                UpdateCrafting(player->peer_id);
                SendInventory(player->peer_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.
                        */
                        bool cannot_punch_node = false;

                        MapNode n(CONTENT_IGNORE);

                        try
                        {
                                n = m_env->getMap().getNode(p_under);
                        }
                        catch(InvalidPositionException &e)
                        {
                                infostream<<"Server: Not punching: Node not found."
                                                <<" Adding block to emerge queue."
                                                <<std::endl;
                                m_emerge_queue.addBlock(peer_id,
                                                getNodeBlockPos(p_over), BLOCK_EMERGE_FLAG_FROMDISK);
                                cannot_punch_node = true;
                        }

                        if(cannot_punch_node)
                                return;

                        /*
                                Run script hook
                        */
                        scriptapi_environment_on_punchnode(m_lua, p_under, n);

                } // 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;

                        content_t material = CONTENT_IGNORE;
                        u8 mineral = MINERAL_NONE;

                        bool cannot_remove_node = false;
                        
                        MapNode n(CONTENT_IGNORE);
                        try
                        {
                                n = m_env->getMap().getNode(p_under);
                                // Get mineral
                                mineral = n.getMineral(m_nodedef);
                                // Get material at position
                                material = n.getContent();
                                // If not yet cancelled
                                if(cannot_remove_node == false)
                                {
                                        // If it's not diggable, do nothing
                                        if(m_nodedef->get(material).diggable == false)
                                        {
                                                infostream<<"Server: Not finishing digging: "
                                                                <<"Node not diggable"
                                                                <<std::endl;
                                                cannot_remove_node = true;
                                        }
                                }
                                // If not yet cancelled
                                if(cannot_remove_node == false)
                                {
                                        // Get node metadata
                                        NodeMetadata *meta = m_env->getMap().getNodeMetadata(p_under);
                                        if(meta && meta->nodeRemovalDisabled() == true)
                                        {
                                                infostream<<"Server: Not finishing digging: "
                                                                <<"Node metadata disables removal"
                                                                <<std::endl;
                                                cannot_remove_node = true;
                                        }
                                }
                        }
                        catch(InvalidPositionException &e)
                        {
                                infostream<<"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);
                                cannot_remove_node = true;
                        }

                        // Make sure the player is allowed to do it
                        if((getPlayerPrivs(player) & PRIV_BUILD) == 0)
                        {
                                infostream<<"Player "<<player->getName()<<" cannot remove node"
                                                <<" because privileges are "<<getPlayerPrivs(player)
                                                <<std::endl;
                                cannot_remove_node = true;
                        }

                        /*
                                If node can't be removed, set block to be re-sent to
                                client and quit.
                        */
                        if(cannot_remove_node)
                        {
                                infostream<<"Server: Not finishing digging."<<std::endl;

                                // Client probably has wrong data.
                                // Set block not sent, so that client will get
                                // a valid one.
                                infostream<<"Client "<<peer_id<<" tried to dig "
                                                <<"node; but node cannot be removed."
                                                <<" setting MapBlock not sent."<<std::endl;
                                RemoteClient *client = getClient(peer_id);
                                v3s16 blockpos = getNodeBlockPos(p_under);
                                client->SetBlockNotSent(blockpos);
                                        
                                return;
                        }
                        
                        actionstream<<player->getName()<<" digs "<<PP(p_under)
                                        <<", gets material "<<(int)material<<", mineral "
                                        <<(int)mineral<<std::endl;
                        
                        /*
                                Send the removal to all close-by players.
                                - If other player is close, send REMOVENODE
                                - Otherwise set blocks not sent
                        */
                        core::list<u16> far_players;
                        sendRemoveNode(p_under, peer_id, &far_players, 30);
                        
                        /*
                                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
                                                ToolDiggingProperties tp =
                                                                m_toolmgr->getDiggingProperties(toolname);
                                                DiggingProperties prop =
                                                                getDiggingProperties(material, &tp, m_nodedef);

                                                if(prop.diggable == false)
                                                {
                                                        infostream<<"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, this);
                                
                                // If not mineral
                                if(item == NULL)
                                {
                                        const std::string &dug_s = m_nodedef->get(material).dug_item;
                                        if(dug_s != "")
                                        {
                                                std::istringstream is(dug_s, std::ios::binary);
                                                item = InventoryItem::deSerialize(is, this);
                                        }
                                }
                                
                                if(item != NULL)
                                {
                                        // Add a item to inventory
                                        player->inventory.addItem("main", item);

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

                                item = NULL;

                                if(mineral != MINERAL_NONE)
                                  item = getDiggedMineralItem(mineral, this);
                        
                                // If not mineral
                                if(item == NULL)
                                {
                                        const std::string &extra_dug_s = m_nodedef->get(material).extra_dug_item;
                                        s32 extra_rarity = m_nodedef->get(material).extra_dug_item_rarity;
                                        if(extra_dug_s != "" && extra_rarity != 0
                                           && myrand() % extra_rarity == 0)
                                        {
                                                std::istringstream is(extra_dug_s, std::ios::binary);
                                                item = InventoryItem::deSerialize(is, this);
                                        }
                                }
                        
                                if(item != NULL)
                                {
                                        // Add a item to inventory
                                        player->inventory.addItem("main", item);

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

                        /*
                                Remove the node
                                (this takes some time so it is done after the quick stuff)
                        */
                        {
                                MapEditEventIgnorer ign(&m_ignore_map_edit_events);

                                m_env->getMap().removeNodeAndUpdate(p_under, modified_blocks);
                        }
                        /*
                                Set blocks not sent to far players
                        */
                        for(core::list<u16>::Iterator
                                        i = far_players.begin();
                                        i != far_players.end(); i++)
                        {
                                u16 peer_id = *i;
                                RemoteClient *client = getClient(peer_id);
                                if(client==NULL)
                                        continue;
                                client->SetBlocksNotSent(modified_blocks);
                        }

                        /*
                                Run script hook
                        */
                        scriptapi_environment_on_dignode(m_lua, p_under, n);
                }
                
                /*
                        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);
                                        bool no_enough_privs =
                                                        ((getPlayerPrivs(player) & PRIV_BUILD)==0);
                                        if(no_enough_privs)
                                                infostream<<"Player "<<player->getName()<<" cannot add node"
                                                        <<" because privileges are "<<getPlayerPrivs(player)
                                                        <<std::endl;

                                        if(m_nodedef->get(n2).buildable_to == false
                                                || no_enough_privs)
                                        {
                                                // Client probably has wrong data.
                                                // Set block not sent, so that client will get
                                                // a valid one.
                                                infostream<<"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)
                                {
                                        infostream<<"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.setContent(mitem->getMaterial());

                                actionstream<<player->getName()<<" places material "
                                                <<(int)mitem->getMaterial()
                                                <<" at "<<PP(p_under)<<std::endl;
                        
                                // Calculate direction for wall mounted stuff
                                if(m_nodedef->get(n).wall_mounted)
                                        n.param2 = packDir(p_under - p_over);

                                // Calculate the direction for furnaces and chests and stuff
                                if(m_nodedef->get(n).param_type == CPT_FACEDIR_SIMPLE)
                                {
                                        v3f playerpos = player->getPosition();
                                        v3f blockpos = intToFloat(p_over, BS) - playerpos;
                                        blockpos = blockpos.normalize();
                                        n.param1 = 0;
                                        if (fabs(blockpos.X) > fabs(blockpos.Z)) {
                                                if (blockpos.X < 0)
                                                        n.param1 = 3;
                                                else
                                                        n.param1 = 1;
                                        } else {
                                                if (blockpos.Z < 0)
                                                        n.param1 = 2;
                                                else
                                                        n.param1 = 0;
                                        }
                                }

                                /*
                                        Send to all close-by players
                                */
                                core::list<u16> far_players;
                                sendAddNode(p_over, n, 0, &far_players, 30);
                                
                                /*
                                        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
                                        UpdateCrafting(peer_id);
                                        SendInventory(peer_id);
                                }
                                
                                /*
                                        Add node.

                                        This takes some time so it is done after the quick stuff
                                */
                                core::map<v3s16, MapBlock*> modified_blocks;
                                {
                                        MapEditEventIgnorer ign(&m_ignore_map_edit_events);

                                        std::string p_name = std::string(player->getName());
                                        m_env->getMap().addNodeAndUpdate(p_over, n, modified_blocks, p_name);
                                }
                                /*
                                        Set blocks not sent to far players
                                */
                                for(core::list<u16>::Iterator
                                                i = far_players.begin();
                                                i != far_players.end(); i++)
                                {
                                        u16 peer_id = *i;
                                        RemoteClient *client = getClient(peer_id);
                                        if(client==NULL)
                                                continue;
                                        client->SetBlocksNotSent(modified_blocks);
                                }

                                /*
                                        Run script hook
                                */
                                scriptapi_environment_on_placenode(m_lua, p_over, n);

                                /*
                                        Calculate special events
                                */
                                
                                /*if(n.d == LEGN(m_nodedef, "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++)
                                        {
                                                
                                        }
                                }*/
                        }
                        /*
                                Place other item (not a block)
                        */
                        else
                        {
                                v3s16 blockpos = getNodeBlockPos(p_over);
                                
                                /*
                                        Check that the block is loaded so that the item
                                        can properly be added to the static list too
                                */
                                MapBlock *block = m_env->getMap().getBlockNoCreateNoEx(blockpos);
                                if(block==NULL)
                                {
                                        infostream<<"Error while placing object: "
                                                        "block not found"<<std::endl;
                                        return;
                                }

                                /*
                                        If in creative mode, item dropping is disabled unless
                                        player has build privileges
                                */
                                if(g_settings->getBool("creative_mode") &&
                                        (getPlayerPrivs(player) & PRIV_BUILD) == 0)
                                {
                                        infostream<<"Not allowing player to drop item: "
                                                        "creative mode and no build privs"<<std::endl;
                                        return;
                                }

                                // Calculate a position for it
                                v3f pos = intToFloat(p_over, BS);
                                //pos.Y -= BS*0.45;
                                /*pos.Y -= BS*0.25; // let it drop a bit
                                // Randomize a bit
                                pos.X += BS*0.2*(float)myrand_range(-1000,1000)/1000.0;
                                pos.Z += BS*0.2*(float)myrand_range(-1000,1000)/1000.0;*/

                                /*
                                        Create the object
                                */
                                ServerActiveObject *obj = item->createSAO(m_env, 0, pos);

                                if(obj == NULL)
                                {
                                        infostream<<"WARNING: item resulted in NULL object, "
                                                        <<"not placing onto map"
                                                        <<std::endl;
                                }
                                else
                                {
                                        actionstream<<player->getName()<<" places "<<item->getName()
                                                        <<" at "<<PP(p_over)<<std::endl;
                                
                                        // Add the object to the environment
                                        m_env->addActiveObject(obj);
                                        
                                        infostream<<"Placed object"<<std::endl;

                                        if(g_settings->getBool("creative_mode") == false)
                                        {
                                                // Delete the right amount of items from the slot
                                                u16 dropcount = item->getDropCount();
                                                
                                                // Delete item if all gone
                                                if(item->getCount() <= dropcount)
                                                {
                                                        if(item->getCount() < dropcount)
                                                                infostream<<"WARNING: Server: dropped more items"
                                                                                <<" than the slot contains"<<std::endl;
                                                        
                                                        InventoryList *ilist = player->inventory.getList("main");
                                                        if(ilist)
                                                                // Remove from inventory and send inventory
                                                                ilist->deleteItem(item_i);
                                                }
                                                // Else decrement it
                                                else
                                                        item->remove(dropcount);
                                                
                                                // Send inventory
                                                UpdateCrafting(peer_id);
                                                SendInventory(peer_id);
                                        }
                                }
                        }

                } // action == 1

                /*
                        Catch invalid actions
                */
                else
                {
                        infostream<<"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
                */
                infostream<<"TOSERVER_RELEASE ignored"<<std::endl;
        }
#endif
        else if(command == TOSERVER_SIGNTEXT)
        {
                infostream<<"Server: TOSERVER_SIGNTEXT not supported anymore"
                                <<std::endl;
                return;
        }
        else if(command == TOSERVER_SIGNNODETEXT)
        {
                if((getPlayerPrivs(player) & PRIV_BUILD) == 0)
                        return;
                /*
                        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() != LEGN(m_nodedef, "CONTENT_SIGN_WALL"))
                        return;
                SignNodeMetadata *signmeta = (SignNodeMetadata*)meta;
                signmeta->setText(text);
                
                actionstream<<player->getName()<<" writes \""<<text<<"\" to sign "
                                <<" at "<<PP(p)<<std::endl;
                                
                v3s16 blockpos = getNodeBlockPos(p);
                MapBlock *block = m_env->getMap().getBlockNoCreateNoEx(blockpos);
                if(block)
                {
                        block->raiseModified(MOD_STATE_WRITE_NEEDED,
                                        "sign node text");
                }

                setBlockNotSent(blockpos);
        }
        else if(command == TOSERVER_INVENTORY_ACTION)
        {
                /*// Ignore inventory changes if in creative mode
                if(g_settings->getBool("creative_mode") == true)
                {
                        infostream<<"TOSERVER_INVENTORY_ACTION: ignoring in creative mode"
                                        <<std::endl;
                        return;
                }*/
                // Strip command and create a stream
                std::string datastring((char*)&data[2], datasize-2);
                infostream<<"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")
                                {
                                        InventoryList *rlist = player->inventory.getList("craftresult");
                                        assert(rlist);
                                        InventoryList *clist = player->inventory.getList("craft");
                                        assert(clist);
                                        InventoryList *mlist = player->inventory.getList("main");
                                        assert(mlist);
                                        /*
                                                Craftresult is no longer preview if something
                                                is moved into it
                                        */
                                        if(ma->to_list == "craftresult"
                                                        && ma->from_list != "craftresult")
                                        {
                                                // If it currently is a preview, remove
                                                // its contents
                                                if(player->craftresult_is_preview)
                                                {
                                                        rlist->deleteItem(0);
                                                }
                                                player->craftresult_is_preview = false;
                                        }
                                        /*
                                                Crafting takes place if this condition is true.
                                        */
                                        if(player->craftresult_is_preview &&
                                                        ma->from_list == "craftresult")
                                        {
                                                player->craftresult_is_preview = false;
                                                clist->decrementMaterials(1);
                                                
                                                /* Print out action */
                                                InventoryList *list =
                                                                player->inventory.getList("craftresult");
                                                assert(list);
                                                InventoryItem *item = list->getItem(0);
                                                std::string itemname = "NULL";
                                                if(item)
                                                        itemname = item->getName();
                                                actionstream<<player->getName()<<" crafts "
                                                                <<itemname<<std::endl;
                                        }
                                        /*
                                                If the craftresult is placed on itself, move it to
                                                main inventory instead of doing the action
                                        */
                                        if(ma->to_list == "craftresult"
                                                        && ma->from_list == "craftresult")
                                        {
                                                disable_action = true;
                                                
                                                InventoryItem *item1 = rlist->changeItem(0, NULL);
                                                mlist->addItem(item1);
                                        }
                                }
                                // Disallow moving items if not allowed to build
                                else if((getPlayerPrivs(player) & PRIV_BUILD) == 0)
                                {
                                        return;
                                }
                                // if it's a locking chest, only allow the owner or server admins to move items
                                else if (ma->from_inv != "current_player" && (getPlayerPrivs(player) & PRIV_SERVER) == 0)
                                {
                                        Strfnd fn(ma->from_inv);
                                        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 && meta->typeId() == LEGN(m_nodedef, "CONTENT_LOCKABLE_CHEST")) {
                                                        LockingChestNodeMetadata *lcm = (LockingChestNodeMetadata*)meta;
                                                        if (lcm->getOwner() != player->getName())
                                                                return;
                                                }
                                        }
                                }
                                else if (ma->to_inv != "current_player" && (getPlayerPrivs(player) & PRIV_SERVER) == 0)
                                {
                                        Strfnd fn(ma->to_inv);
                                        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 && meta->typeId() == LEGN(m_nodedef, "CONTENT_LOCKABLE_CHEST")) {
                                                        LockingChestNodeMetadata *lcm = (LockingChestNodeMetadata*)meta;
                                                        if (lcm->getOwner() != player->getName())
                                                                return;
                                                }
                                        }
                                }
                        }
                        
                        if(disable_action == false)
                        {
                                // Feed action to player inventory
                                a->apply(&c, this);
                                // Eat the action
                                delete a;
                        }
                        else
                        {
                                // Send inventory
                                UpdateCrafting(player->peer_id);
                                SendInventory(player->peer_id);
                        }
                }
                else
                {
                        infostream<<"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;
                
                // Local player gets all privileges regardless of
                // what's set on their account.
                u64 privs = getPlayerPrivs(player);

                // Parse commands
                if(message[0] == L'/')
                {
                        size_t strip_size = 1;
                        if (message[1] == L'#') // support old-style commans
                                ++strip_size;
                        message = message.substr(strip_size);

                        WStrfnd f1(message);
                        f1.next(L" "); // Skip over /#whatever
                        std::wstring paramstring = f1.next(L"");

                        ServerCommandContext *ctx = new ServerCommandContext(
                                str_split(message, L' '),
                                paramstring,
                                this,
                                m_env,
                                player,
                                privs);

                        std::wstring reply(processServerCommand(ctx));
                        send_to_sender = ctx->flags & SEND_TO_SENDER;
                        send_to_others = ctx->flags & SEND_TO_OTHERS;

                        if (ctx->flags & SEND_NO_PREFIX)
                                line += reply;
                        else
                                line += L"Server: " + reply;

                        delete ctx;

                }
                else
                {
                        if(privs & PRIV_SHOUT)
                        {
                                line += L"<";
                                line += name;
                                line += L"> ";
                                line += message;
                                send_to_others = true;
                        }
                        else
                        {
                                line += L"Server: You are not allowed to shout";
                                send_to_sender = true;
                        }
                }
                
                if(line != L"")
                {
                        if(send_to_others)
                                actionstream<<"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 if(command == TOSERVER_DAMAGE)
        {
                std::string datastring((char*)&data[2], datasize-2);
                std::istringstream is(datastring, std::ios_base::binary);
                u8 damage = readU8(is);

                if(g_settings->getBool("enable_damage"))
                {
                        actionstream<<player->getName()<<" damaged by "
                                        <<(int)damage<<" hp at "<<PP(player->getPosition()/BS)
                                        <<std::endl;
                                
                        HandlePlayerHP(player, damage);
                }
                else
                {
                        SendPlayerHP(player);
                }
        }
        else if(command == TOSERVER_PASSWORD)
        {
                /*
                        [0] u16 TOSERVER_PASSWORD
                        [2] u8[28] old password
                        [30] u8[28] new password
                */

                if(datasize != 2+PASSWORD_SIZE*2)
                        return;
                /*char password[PASSWORD_SIZE];
                for(u32 i=0; i<PASSWORD_SIZE-1; i++)
                        password[i] = data[2+i];
                password[PASSWORD_SIZE-1] = 0;*/
                std::string oldpwd;
                for(u32 i=0; i<PASSWORD_SIZE-1; i++)
                {
                        char c = data[2+i];
                        if(c == 0)
                                break;
                        oldpwd += c;
                }
                std::string newpwd;
                for(u32 i=0; i<PASSWORD_SIZE-1; i++)
                {
                        char c = data[2+PASSWORD_SIZE+i];
                        if(c == 0)
                                break;
                        newpwd += c;
                }

                infostream<<"Server: Client requests a password change from "
                                <<"'"<<oldpwd<<"' to '"<<newpwd<<"'"<<std::endl;

                std::string playername = player->getName();

                if(m_authmanager.exists(playername) == false)
                {
                        infostream<<"Server: playername not found in authmanager"<<std::endl;
                        // Wrong old password supplied!!
                        SendChatMessage(peer_id, L"playername not found in authmanager");
                        return;
                }

                std::string checkpwd = m_authmanager.getPassword(playername);

                if(oldpwd != checkpwd)
                {
                        infostream<<"Server: invalid old password"<<std::endl;
                        // Wrong old password supplied!!
                        SendChatMessage(peer_id, L"Invalid old password supplied. Password NOT changed.");
                        return;
                }

                actionstream<<player->getName()<<" changes password"<<std::endl;

                m_authmanager.setPassword(playername, newpwd);
                
                infostream<<"Server: password change successful for "<<playername
                                <<std::endl;
                SendChatMessage(peer_id, L"Password change successful");
        }
        else if(command == TOSERVER_PLAYERITEM)
        {
                if (datasize < 2+2)
                        return;

                u16 item = readU16(&data[2]);
                player->wieldItem(item);
                SendWieldedItem(player);
        }
        else if(command == TOSERVER_RESPAWN)
        {
                if(player->hp != 0)
                        return;
                
                RespawnPlayer(player);
                
                actionstream<<player->getName()<<" respawns at "
                                <<PP(player->getPosition()/BS)<<std::endl;
        }
        else
        {
                infostream<<"Server::ProcessData(): Ignoring "
                                "unknown command "<<command<<std::endl;
        }
        
        } //try
        catch(SendFailedException &e)
        {
                errorstream<<"Server::ProcessData(): SendFailedException: "
                                <<"what="<<e.what()
                                <<std::endl;
        }
}

void Server::onMapEditEvent(MapEditEvent *event)
{
        //infostream<<"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();
                infostream<<"nodemeta at ("<<p.X<<","<<p.Y<<","<<p.Z<<"): "
                                <<"no metadata found"<<std::endl;
                return NULL;
        }

        infostream<<__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
                UpdateCrafting(c->current_player->peer_id);
                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(","));
                v3s16 blockpos = getNodeBlockPos(p);

                NodeMetadata *meta = m_env->getMap().getNodeMetadata(p);
                if(meta)
                        meta->inventoryModified();
                
                MapBlock *block = m_env->getMap().getBlockNoCreateNoEx(blockpos);
                if(block)
                        block->raiseModified(MOD_STATE_WRITE_NEEDED);
                
                setBlockNotSent(blockpos);

                return;
        }

        infostream<<__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{
                        // Copy info from connection to info struct
                        info.id = player->peer_id;
                        info.address = m_con.GetPeerAddress(player->peer_id);
                        info.avg_rtt = m_con.GetPeerAvgRTT(player->peer_id);
                }
                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);
        infostream<<"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);
        infostream<<"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);
}

/*
        Static send methods
*/

void Server::SendHP(con::Connection &con, u16 peer_id, u8 hp)
{
        DSTACK(__FUNCTION_NAME);
        std::ostringstream os(std::ios_base::binary);

        writeU16(os, TOCLIENT_HP);
        writeU8(os, hp);

        // Make data buffer
        std::string s = os.str();
        SharedBuffer<u8> data((u8*)s.c_str(), s.size());
        // Send as reliable
        con.Send(peer_id, 0, data, true);
}

void Server::SendAccessDenied(con::Connection &con, u16 peer_id,
                const std::wstring &reason)
{
        DSTACK(__FUNCTION_NAME);
        std::ostringstream os(std::ios_base::binary);

        writeU16(os, TOCLIENT_ACCESS_DENIED);
        os<<serializeWideString(reason);

        // Make data buffer
        std::string s = os.str();
        SharedBuffer<u8> data((u8*)s.c_str(), s.size());
        // Send as reliable
        con.Send(peer_id, 0, data, true);
}

void Server::SendDeathscreen(con::Connection &con, u16 peer_id,
                bool set_camera_point_target, v3f camera_point_target)
{
        DSTACK(__FUNCTION_NAME);
        std::ostringstream os(std::ios_base::binary);

        writeU16(os, TOCLIENT_DEATHSCREEN);
        writeU8(os, set_camera_point_target);
        writeV3F1000(os, camera_point_target);

        // Make data buffer
        std::string s = os.str();
        SharedBuffer<u8> data((u8*)s.c_str(), s.size());
        // Send as reliable
        con.Send(peer_id, 0, data, true);
}

void Server::SendToolDef(con::Connection &con, u16 peer_id,
                IToolDefManager *tooldef)
{
        DSTACK(__FUNCTION_NAME);
        std::ostringstream os(std::ios_base::binary);

        /*
                u16 command
                u32 length of the next item
                serialized ToolDefManager
        */
        writeU16(os, TOCLIENT_TOOLDEF);
        std::ostringstream tmp_os(std::ios::binary);
        tooldef->serialize(tmp_os);
        os<<serializeLongString(tmp_os.str());

        // Make data buffer
        std::string s = os.str();
        infostream<<"Server::SendToolDef(): Sending tool definitions: size="
                        <<s.size()<<std::endl;
        SharedBuffer<u8> data((u8*)s.c_str(), s.size());
        // Send as reliable
        con.Send(peer_id, 0, data, true);
}

void Server::SendNodeDef(con::Connection &con, u16 peer_id,
                INodeDefManager *nodedef)
{
        DSTACK(__FUNCTION_NAME);
        std::ostringstream os(std::ios_base::binary);

        /*
                u16 command
                u32 length of the next item
                serialized NodeDefManager
        */
        writeU16(os, TOCLIENT_NODEDEF);
        std::ostringstream tmp_os(std::ios::binary);
        nodedef->serialize(tmp_os);
        os<<serializeLongString(tmp_os.str());

        // Make data buffer
        std::string s = os.str();
        infostream<<"Server::SendNodeDef(): Sending node definitions: size="
                        <<s.size()<<std::endl;
        SharedBuffer<u8> data((u8*)s.c_str(), s.size());
        // Send as reliable
        con.Send(peer_id, 0, data, true);
}

/*
        Non-static send methods
*/

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;

                /*infostream<<"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);
}

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

        /*
                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);
}

std::string getWieldedItemString(const Player *player)
{
        const InventoryItem *item = player->getWieldItem();
        if (item == NULL)
                return std::string("");
        std::ostringstream os(std::ios_base::binary);
        item->serialize(os);
        return os.str();
}

void Server::SendWieldedItem(const Player* player)
{
        DSTACK(__FUNCTION_NAME);

        assert(player);

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

        writeU16(os, TOCLIENT_PLAYERITEM);
        writeU16(os, 1);
        writeU16(os, player->peer_id);
        os<<serializeString(getWieldedItemString(player));

        // Make data buffer
        std::string s = os.str();
        SharedBuffer<u8> data((u8*)s.c_str(), s.size());

        m_con.SendToAll(0, data, true);
}

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

        std::ostringstream os(std::ios_base::binary);
        core::list<Player *> players = m_env->getPlayers(true);

        writeU16(os, TOCLIENT_PLAYERITEM);
        writeU16(os, players.size());
        core::list<Player *>::Iterator i;
        for(i = players.begin(); i != players.end(); ++i)
        {
                Player *p = *i;
                writeU16(os, p->peer_id);
                os<<serializeString(getWieldedItemString(p));
        }

        // Make data buffer
        std::string s = os.str();
        SharedBuffer<u8> data((u8*)s.c_str(), s.size());

        m_con.SendToAll(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::SendPlayerHP(Player *player)
{
        SendHP(m_con, player->peer_id, player->hp);
}

void Server::SendMovePlayer(Player *player)
{
        DSTACK(__FUNCTION_NAME);
        std::ostringstream os(std::ios_base::binary);

        writeU16(os, TOCLIENT_MOVE_PLAYER);
        writeV3F1000(os, player->getPosition());
        writeF1000(os, player->getPitch());
        writeF1000(os, player->getYaw());
        
        {
                v3f pos = player->getPosition();
                f32 pitch = player->getPitch();
                f32 yaw = player->getYaw();
                infostream<<"Server sending TOCLIENT_MOVE_PLAYER"
                                <<" pos=("<<pos.X<<","<<pos.Y<<","<<pos.Z<<")"
                                <<" pitch="<<pitch
                                <<" yaw="<<yaw
                                <<std::endl;
        }

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

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

        // 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;
                
                if(far_players)
                {
                        // Get player
                        Player *player = m_env->getPlayer(client->peer_id);
                        if(player)
                        {
                                // If player is far away, only set modified blocks not sent
                                v3f player_pos = player->getPosition();
                                if(player_pos.getDistanceFrom(p_f) > maxd)
                                {
                                        far_players->push_back(client->peer_id);
                                        continue;
                                }
                        }
                }

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

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

        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;

                if(far_players)
                {
                        // Get player
                        Player *player = m_env->getPlayer(client->peer_id);
                        if(player)
                        {
                                // If player is far away, only set modified blocks not sent
                                v3f player_pos = player->getPosition();
                                if(player_pos.getDistanceFrom(p_f) > maxd)
                                {
                                        far_players->push_back(client->peer_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::setBlockNotSent(v3s16 p)
{
        for(core::map<u16, RemoteClient*>::Iterator
                i = m_clients.getIterator();
                i.atEnd()==false; i++)
        {
                RemoteClient *client = i.getNode()->getValue();
                client->SetBlockNotSent(p);
        }
}

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

        v3s16 p = block->getPos();
        
#if 0
        // Analyze it a bit
        bool completely_air = true;
        for(s16 z0=0; z0<MAP_BLOCKSIZE; z0++)
        for(s16 x0=0; x0<MAP_BLOCKSIZE; x0++)
        for(s16 y0=0; y0<MAP_BLOCKSIZE; y0++)
        {
                if(block->getNodeNoEx(v3s16(x0,y0,z0)).d != CONTENT_AIR)
                {
                        completely_air = false;
                        x0 = y0 = z0 = MAP_BLOCKSIZE; // Break out
                }
        }

        // Print result
        infostream<<"Server: Sending block ("<<p.X<<","<<p.Y<<","<<p.Z<<"): ";
        if(completely_air)
                infostream<<"[completely air] ";
        infostream<<std::endl;
#endif

        /*
                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);
        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());

        /*infostream<<"Server: 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;
        
        {
                ScopeProfiler sp(g_profiler, "Server: selecting blocks for sending");

                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++;
        }
}

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

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

void Server::SendTextures(u16 peer_id)
{
        DSTACK(__FUNCTION_NAME);

        infostream<<"Server::SendTextures(): Sending textures to client"<<std::endl;
        
        /* Read textures */
        
        // Put 5kB in one bunch (this is not accurate)
        u32 bytes_per_bunch = 5000;
        
        core::array< core::list<SendableTexture> > texture_bunches;
        texture_bunches.push_back(core::list<SendableTexture>());
        
        u32 texture_size_bunch_total = 0;
        core::list<ModSpec> mods = getMods(m_modspaths);
        for(core::list<ModSpec>::Iterator i = mods.begin();
                        i != mods.end(); i++){
                ModSpec mod = *i;
                std::string texturepath = mod.path + DIR_DELIM + "textures";
                std::vector<fs::DirListNode> dirlist = fs::GetDirListing(texturepath);
                for(u32 j=0; j<dirlist.size(); j++){
                        if(dirlist[j].dir) // Ignode dirs
                                continue;
                        std::string tname = dirlist[j].name;
                        std::string tpath = texturepath + DIR_DELIM + tname;
                        // Read data
                        std::ifstream fis(tpath.c_str(), std::ios_base::binary);
                        if(fis.good() == false){
                                errorstream<<"Server::SendTextures(): Could not open \""
                                                <<tname<<"\" for reading"<<std::endl;
                                continue;
                        }
                        std::ostringstream tmp_os(std::ios_base::binary);
                        bool bad = false;
                        for(;;){
                                char buf[1024];
                                fis.read(buf, 1024);
                                std::streamsize len = fis.gcount();
                                tmp_os.write(buf, len);
                                texture_size_bunch_total += len;
                                if(fis.eof())
                                        break;
                                if(!fis.good()){
                                        bad = true;
                                        break;
                                }
                        }
                        if(bad){
                                errorstream<<"Server::SendTextures(): Failed to read \""
                                                <<tname<<"\""<<std::endl;
                                continue;
                        }
                        /*infostream<<"Server::SendTextures(): Loaded \""
                                        <<tname<<"\""<<std::endl;*/
                        // Put in list
                        texture_bunches[texture_bunches.size()-1].push_back(
                                        SendableTexture(tname, tpath, tmp_os.str()));
                        
                        // Start next bunch if got enough data
                        if(texture_size_bunch_total >= bytes_per_bunch){
                                texture_bunches.push_back(core::list<SendableTexture>());
                                texture_size_bunch_total = 0;
                        }
                }
        }

        /* Create and send packets */
        
        u32 num_bunches = texture_bunches.size();
        for(u32 i=0; i<num_bunches; i++)
        {
                /*
                        u16 command
                        u16 total number of texture bunches
                        u16 index of this bunch
                        u32 number of textures in this bunch
                        for each texture {
                                u16 length of name
                                string name
                                u32 length of data
                                data
                        }
                */
                std::ostringstream os(std::ios_base::binary);

                writeU16(os, TOCLIENT_TEXTURES);
                writeU16(os, num_bunches);
                writeU16(os, i);
                writeU32(os, texture_bunches[i].size());
                
                for(core::list<SendableTexture>::Iterator
                                j = texture_bunches[i].begin();
                                j != texture_bunches[i].end(); j++){
                        os<<serializeString(j->name);
                        os<<serializeLongString(j->data);
                }
                
                // Make data buffer
                std::string s = os.str();
                infostream<<"Server::SendTextures(): bunch "<<i<<"/"<<num_bunches
                                <<" textures="<<texture_bunches[i].size()
                                <<" size=" <<s.size()<<std::endl;
                SharedBuffer<u8> data((u8*)s.c_str(), s.size());
                // Send as reliable
                m_con.Send(peer_id, 0, data, true);
        }
}

/*
        Something random
*/

void Server::HandlePlayerHP(Player *player, s16 damage)
{
        if(player->hp > damage)
        {
                player->hp -= damage;
                SendPlayerHP(player);
        }
        else
        {
                infostream<<"Server::HandlePlayerHP(): Player "
                                <<player->getName()<<" dies"<<std::endl;
                
                player->hp = 0;
                
                //TODO: Throw items around
                
                // Handle players that are not connected
                if(player->peer_id == PEER_ID_INEXISTENT){
                        RespawnPlayer(player);
                        return;
                }

                SendPlayerHP(player);
                
                RemoteClient *client = getClient(player->peer_id);
                if(client->net_proto_version >= 3)
                {
                        SendDeathscreen(m_con, player->peer_id, false, v3f(0,0,0));
                }
                else
                {
                        RespawnPlayer(player);
                }
        }
}

void Server::RespawnPlayer(Player *player)
{
        v3f pos = findSpawnPos(m_env->getServerMap());
        player->setPosition(pos);
        player->hp = 20;
        SendMovePlayer(player);
        SendPlayerHP(player);
}

void Server::UpdateCrafting(u16 peer_id)
{
        DSTACK(__FUNCTION_NAME);
        
        Player* player = m_env->getPlayer(peer_id);
        assert(player);

        /*
                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->getUsedSlots() == 0)
                        player->craftresult_is_preview = true;

                if(rlist && player->craftresult_is_preview)
                {
                        rlist->clearItems();
                }
                if(clist && rlist && player->craftresult_is_preview)
                {
                        // Get result of crafting grid
                        
                        std::vector<InventoryItem*> items;
                        for(u16 i=0; i<9; i++){
                                if(clist->getItem(i) == NULL)
                                        items.push_back(NULL);
                                else
                                        items.push_back(clist->getItem(i)->clone());
                        }
                        CraftPointerInput cpi(3, items);
                        
                        InventoryItem *result = m_craftdef->getCraftResult(cpi, this);
                        //InventoryItem *result = craft_get_result(items, this);
                        if(result)
                                rlist->addItem(result);
                }
        
        } // if creative_mode == false
}

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: ";
        // Version
        os<<L"version="<<narrow_to_wide(VERSION_STRING);
        // 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<<std::endl<<L"# Server: "<<" WARNING: Map saving is disabled.";
        if(g_settings->get("motd") != "")
                os<<std::endl<<L"# Server: "<<narrow_to_wide(g_settings->get("motd"));
        return os.str();
}

// Saves g_settings to configpath given at initialization
void Server::saveConfig()
{
        if(m_configpath != "")
                g_settings->updateConfigFile(m_configpath.c_str());
}

void Server::notifyPlayer(const char *name, const std::wstring msg)
{
        Player *player = m_env->getPlayer(name);
        if(!player)
                return;
        SendChatMessage(player->peer_id, std::wstring(L"Server: -!- ")+msg);
}

void Server::notifyPlayers(const std::wstring msg)
{
        BroadcastChatMessage(msg);
}

// IGameDef interface
// Under envlock
IToolDefManager* Server::getToolDefManager()
{
        return m_toolmgr;
}
INodeDefManager* Server::getNodeDefManager()
{
        return m_nodedef;
}
ICraftDefManager* Server::getCraftDefManager()
{
        return m_craftdef;
}
ITextureSource* Server::getTextureSource()
{
        return NULL;
}
u16 Server::allocateUnknownNodeId(const std::string &name)
{
        return m_nodedef->allocateDummy(name);
}

IWritableToolDefManager* Server::getWritableToolDefManager()
{
        return m_toolmgr;
}
IWritableNodeDefManager* Server::getWritableNodeDefManager()
{
        return m_nodedef;
}
IWritableCraftDefManager* Server::getWritableCraftDefManager()
{
        return m_craftdef;
}

v3f findSpawnPos(ServerMap &map)
{
        //return v3f(50,50,50)*BS;

        v3s16 nodepos;
        
#if 0
        nodepos = v2s16(0,0);
        groundheight = 20;
#endif

#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
                v2s16 nodepos2d = v2s16(-range + (myrand()%(range*2)),
                                -range + (myrand()%(range*2)));
                //v2s16 sectorpos = getNodeSectorPos(nodepos2d);
                // Get ground height at point (fallbacks to heightmap function)
                s16 groundheight = map.findGroundLevel(nodepos2d);
                // Don't go underwater
                if(groundheight < WATER_LEVEL)
                {
                        //infostream<<"-> Underwater"<<std::endl;
                        continue;
                }
                // Don't go to high places
                if(groundheight > WATER_LEVEL + 4)
                {
                        //infostream<<"-> Underwater"<<std::endl;
                        continue;
                }
                
                nodepos = v3s16(nodepos2d.X, groundheight-2, nodepos2d.Y);
                bool is_good = false;
                s32 air_count = 0;
                for(s32 i=0; i<10; i++){
                        v3s16 blockpos = getNodeBlockPos(nodepos);
                        map.emergeBlock(blockpos, true);
                        MapNode n = map.getNodeNoEx(nodepos);
                        if(n.getContent() == CONTENT_AIR){
                                air_count++;
                                if(air_count >= 2){
                                        is_good = true;
                                        nodepos.Y -= 1;
                                        break;
                                }
                        }
                        nodepos.Y++;
                }
                if(is_good){
                        // Found a good place
                        //infostream<<"Searched through "<<i<<" places."<<std::endl;
                        break;
                }
        }
#endif
        
        return intToFloat(nodepos, BS);
}

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)
                {
                        infostream<<"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"))
                {
                        // Warning: double code below
                        // Backup actual inventory
                        player->inventory_backup = new Inventory();
                        *(player->inventory_backup) = player->inventory;
                        // Set creative inventory
                        craft_set_creative_inventory(player, this);
                }

                return player;
        }

        /*
                If player with the wanted peer_id already exists, cancel.
        */
        if(m_env->getPlayer(peer_id) != NULL)
        {
                infostream<<"emergePlayer(): Player with wrong name but same"
                                " peer_id already exists"<<std::endl;
                return NULL;
        }
        
        /*
                Create a new player
        */
        {
                // Add authentication stuff
                m_authmanager.add(name);
                m_authmanager.setPassword(name, password);
                m_authmanager.setPrivs(name,
                                stringToPrivs(g_settings->get("default_privs")));

                /*
                        Set player position
                */
                
                infostream<<"Server: Finding spawn place for player \""
                                <<name<<"\""<<std::endl;

                v3f pos = findSpawnPos(m_env->getServerMap());

                player = new ServerRemotePlayer(m_env, pos, peer_id, name);

                /*
                        Add player to environment
                */

                m_env->addPlayer(player);

                /*
                        Add stuff to inventory
                */
                
                if(g_settings->getBool("creative_mode"))
                {
                        // Warning: double code above
                        // Backup actual inventory
                        player->inventory_backup = new Inventory();
                        *(player->inventory_backup) = player->inventory;
                        // Set creative inventory
                        craft_set_creative_inventory(player, this);
                }
                else if(g_settings->getBool("give_initial_stuff"))
                {
                        craft_give_initial_stuff(player, this);
                }

                return player;
                
        } // create new player
}

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);
                
                /*
                        Mark objects to be not known by the client
                */
                RemoteClient *client = n->getValue();
                // Handle objects
                for(core::map<u16, bool>::Iterator
                                i = client->m_known_objects.getIterator();
                                i.atEnd()==false; i++)
                {
                        // Get object
                        u16 id = i.getNode()->getKey();
                        ServerActiveObject* obj = m_env->getActiveObject(id);
                        
                        if(obj && obj->m_known_by_count > 0)
                                obj->m_known_by_count--;
                }

                // Collect information about leaving in chat
                std::wstring message;
                {
                        Player *player = m_env->getPlayer(c.peer_id);
                        if(player != NULL)
                        {
                                std::wstring 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;
                        
                        /*
                                Print out action
                        */
                        if(player != NULL)
                        {
                                std::ostringstream os(std::ios_base::binary);
                                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());
                                        if(client->serialization_version == SER_FMT_VER_INVALID)
                                                continue;
                                        // Get player
                                        Player *player = m_env->getPlayer(client->peer_id);
                                        if(!player)
                                                continue;
                                        // Get name of player
                                        os<<player->getName()<<" ";
                                }

                                actionstream<<player->getName()<<" "
                                                <<(c.timeout?"times out.":"leaves game.")
                                                <<" List of players: "
                                                <<os.str()<<std::endl;
                        }
                }
                
                // 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();

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

                handlePeerChange(c);
        }
}

u64 Server::getPlayerPrivs(Player *player)
{
        if(player==NULL)
                return 0;
        std::string playername = player->getName();
        // Local player gets all privileges regardless of
        // what's set on their account.
        if(g_settings->get("name") == playername)
        {
                return PRIV_ALL;
        }
        else
        {
                return getPlayerAuthPrivs(playername);
        }
}

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

        IntervalLimiter m_profiler_interval;

        for(;;)
        {
                // This is kind of a hack but can be done like this
                // because server.step() is very light
                {
                        ScopeProfiler sp(g_profiler, "dedicated server sleep");
                        sleep_ms(30);
                }
                server.step(0.030);

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

                /*
                        Profiler
                */
                float profiler_print_interval =
                                g_settings->getFloat("profiler_print_interval");
                if(profiler_print_interval != 0)
                {
                        if(m_profiler_interval.step(0.030, profiler_print_interval))
                        {
                                infostream<<"Profiler:"<<std::endl;
                                g_profiler->print(infostream);
                                g_profiler->clear();
                        }
                }
                
                /*
                        Player info
                */
                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)
                        {
                                infostream<<DTIME<<"Player info:"<<std::endl;
                                for(i=list.begin(); i!=list.end(); i++)
                                {
                                        i->PrintLine(&infostream);
                                }
                        }
                        sum_old = sum;
                }
        }
}