src/map.cpp

   1 /*
   2 Minetest
   3 Copyright (C) 2010-2013 celeron55, Perttu Ahola <celeron55@gmail.com>
   4
   5 This program is free software; you can redistribute it and/or modify
   6 it under the terms of the GNU Lesser General Public License as published by
   7 the Free Software Foundation; either version 2.1 of the License, or
   8 (at your option) any later version.
   9
  10 This program is distributed in the hope that it will be useful,
  11 but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 GNU Lesser General Public License for more details.
  14
  15 You should have received a copy of the GNU Lesser General Public License along
  16 with this program; if not, write to the Free Software Foundation, Inc.,
  17 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  18 */
  19
  20 #include "map.h"
  21 #include "mapsector.h"
  22 #include "mapblock.h"
  23 #include "filesys.h"
  24 #include "voxel.h"
  25 #include "voxelalgorithms.h"
  26 #include "porting.h"
  27 #include "serialization.h"
  28 #include "nodemetadata.h"
  29 #include "settings.h"
  30 #include "log.h"
  31 #include "profiler.h"
  32 #include "nodedef.h"
  33 #include "gamedef.h"
  34 #include "util/directiontables.h"
  35 #include "util/basic_macros.h"
  36 #include "rollback_interface.h"
  37 #include "environment.h"
  38 #include "reflowscan.h"
  39 #include "emerge.h"
  40 #include "mapgen/mapgen_v6.h"
  41 #include "mapgen/mg_biome.h"
  42 #include "config.h"
  43 #include "server.h"
  44 #include "database/database.h"
  45 #include "database/database-dummy.h"
  46 #include "database/database-sqlite3.h"
  47 #include "script/scripting_server.h"
  48 #include <deque>
  49 #include <queue>
  50 #if USE_LEVELDB
  51 #include "database/database-leveldb.h"
  52 #endif
  53 #if USE_REDIS
  54 #include "database/database-redis.h"
  55 #endif
  56 #if USE_POSTGRESQL
  57 #include "database/database-postgresql.h"
  58 #endif
  59
  60
  61 /*
  62         Map
  63 */
  64
  65 Map::Map(std::ostream &dout, IGameDef *gamedef):
  66         m_dout(dout),
  67         m_gamedef(gamedef),
  68         m_nodedef(gamedef->ndef())
  69 {
  70 }
  71
  72 Map::~Map()
  73 {
  74         /*
  75                 Free all MapSectors
  76         */
  77         for (auto &sector : m_sectors) {
  78                 delete sector.second;
  79         }
  80 }
  81
  82 void Map::addEventReceiver(MapEventReceiver *event_receiver)
  83 {
  84         m_event_receivers.insert(event_receiver);
  85 }
  86
  87 void Map::removeEventReceiver(MapEventReceiver *event_receiver)
  88 {
  89         m_event_receivers.erase(event_receiver);
  90 }
  91
  92 void Map::dispatchEvent(MapEditEvent *event)
  93 {
  94         for (MapEventReceiver *event_receiver : m_event_receivers) {
  95                 event_receiver->onMapEditEvent(event);
  96         }
  97 }
  98
  99 MapSector * Map::getSectorNoGenerateNoLock(v2s16 p)
 100 {
 101         if(m_sector_cache != NULL && p == m_sector_cache_p){
 102                 MapSector * sector = m_sector_cache;
 103                 return sector;
 104         }
 105
 106         std::map<v2s16, MapSector*>::iterator n = m_sectors.find(p);
 107
 108         if (n == m_sectors.end())
 109                 return NULL;
 110
 111         MapSector *sector = n->second;
 112
 113         // Cache the last result
 114         m_sector_cache_p = p;
 115         m_sector_cache = sector;
 116
 117         return sector;
 118 }
 119
 120 MapSector * Map::getSectorNoGenerate(v2s16 p)
 121 {
 122         return getSectorNoGenerateNoLock(p);
 123 }
 124
 125 MapBlock * Map::getBlockNoCreateNoEx(v3s16 p3d)
 126 {
 127         v2s16 p2d(p3d.X, p3d.Z);
 128         MapSector * sector = getSectorNoGenerate(p2d);
 129         if(sector == NULL)
 130                 return NULL;
 131         MapBlock *block = sector->getBlockNoCreateNoEx(p3d.Y);
 132         return block;
 133 }
 134
 135 MapBlock * Map::getBlockNoCreate(v3s16 p3d)
 136 {
 137         MapBlock *block = getBlockNoCreateNoEx(p3d);
 138         if(block == NULL)
 139                 throw InvalidPositionException();
 140         return block;
 141 }
 142
 143 bool Map::isNodeUnderground(v3s16 p)
 144 {
 145         v3s16 blockpos = getNodeBlockPos(p);
 146         MapBlock *block = getBlockNoCreateNoEx(blockpos);
 147         return block && block->getIsUnderground();
 148 }
 149
 150 bool Map::isValidPosition(v3s16 p)
 151 {
 152         v3s16 blockpos = getNodeBlockPos(p);
 153         MapBlock *block = getBlockNoCreateNoEx(blockpos);
 154         return (block != NULL);
 155 }
 156
 157 // Returns a CONTENT_IGNORE node if not found
 158 MapNode Map::getNode(v3s16 p, bool *is_valid_position)
 159 {
 160         v3s16 blockpos = getNodeBlockPos(p);
 161         MapBlock *block = getBlockNoCreateNoEx(blockpos);
 162         if (block == NULL) {
 163                 if (is_valid_position != NULL)
 164                         *is_valid_position = false;
 165                 return {CONTENT_IGNORE};
 166         }
 167
 168         v3s16 relpos = p - blockpos*MAP_BLOCKSIZE;
 169         bool is_valid_p;
 170         MapNode node = block->getNodeNoCheck(relpos, &is_valid_p);
 171         if (is_valid_position != NULL)
 172                 *is_valid_position = is_valid_p;
 173         return node;
 174 }
 175
 176 // throws InvalidPositionException if not found
 177 void Map::setNode(v3s16 p, MapNode & n)
 178 {
 179         v3s16 blockpos = getNodeBlockPos(p);
 180         MapBlock *block = getBlockNoCreate(blockpos);
 181         v3s16 relpos = p - blockpos*MAP_BLOCKSIZE;
 182         // Never allow placing CONTENT_IGNORE, it fucks up stuff
 183         if(n.getContent() == CONTENT_IGNORE){
 184                 bool temp_bool;
 185                 errorstream<<"Map::setNode(): Not allowing to place CONTENT_IGNORE"
 186                                 <<" while trying to replace \""
 187                                 <<m_nodedef->get(block->getNodeNoCheck(relpos, &temp_bool)).name
 188                                 <<"\" at "<<PP(p)<<" (block "<<PP(blockpos)<<")"<<std::endl;
 189                 return;
 190         }
 191         block->setNodeNoCheck(relpos, n);
 192 }
 193
 194 void Map::addNodeAndUpdate(v3s16 p, MapNode n,
 195                 std::map<v3s16, MapBlock*> &modified_blocks,
 196                 bool remove_metadata)
 197 {
 198         // Collect old node for rollback
 199         RollbackNode rollback_oldnode(this, p, m_gamedef);
 200
 201         // This is needed for updating the lighting
 202         MapNode oldnode = getNode(p);
 203
 204         // Remove node metadata
 205         if (remove_metadata) {
 206                 removeNodeMetadata(p);
 207         }
 208
 209         // Set the node on the map
 210         // Ignore light (because calling voxalgo::update_lighting_nodes)
 211         n.setLight(LIGHTBANK_DAY, 0, m_nodedef);
 212         n.setLight(LIGHTBANK_NIGHT, 0, m_nodedef);
 213         setNode(p, n);
 214
 215         // Update lighting
 216         std::vector<std::pair<v3s16, MapNode> > oldnodes;
 217         oldnodes.emplace_back(p, oldnode);
 218         voxalgo::update_lighting_nodes(this, oldnodes, modified_blocks);
 219
 220         for (auto &modified_block : modified_blocks) {
 221                 modified_block.second->expireDayNightDiff();
 222         }
 223
 224         // Report for rollback
 225         if(m_gamedef->rollback())
 226         {
 227                 RollbackNode rollback_newnode(this, p, m_gamedef);
 228                 RollbackAction action;
 229                 action.setSetNode(p, rollback_oldnode, rollback_newnode);
 230                 m_gamedef->rollback()->reportAction(action);
 231         }
 232
 233         /*
 234                 Add neighboring liquid nodes and this node to transform queue.
 235                 (it's vital for the node itself to get updated last, if it was removed.)
 236          */
 237
 238         for (const v3s16 &dir : g_7dirs) {
 239                 v3s16 p2 = p + dir;
 240
 241                 bool is_valid_position;
 242                 MapNode n2 = getNode(p2, &is_valid_position);
 243                 if(is_valid_position &&
 244                                 (m_nodedef->get(n2).isLiquid() ||
 245                                 n2.getContent() == CONTENT_AIR))
 246                         m_transforming_liquid.push_back(p2);
 247         }
 248 }
 249
 250 void Map::removeNodeAndUpdate(v3s16 p,
 251                 std::map<v3s16, MapBlock*> &modified_blocks)
 252 {
 253         addNodeAndUpdate(p, MapNode(CONTENT_AIR), modified_blocks, true);
 254 }
 255
 256 bool Map::addNodeWithEvent(v3s16 p, MapNode n, bool remove_metadata)
 257 {
 258         MapEditEvent event;
 259         event.type = remove_metadata ? MEET_ADDNODE : MEET_SWAPNODE;
 260         event.p = p;
 261         event.n = n;
 262
 263         bool succeeded = true;
 264         try{
 265                 std::map<v3s16, MapBlock*> modified_blocks;
 266                 addNodeAndUpdate(p, n, modified_blocks, remove_metadata);
 267
 268                 // Copy modified_blocks to event
 269                 for (auto &modified_block : modified_blocks) {
 270                         event.modified_blocks.insert(modified_block.first);
 271                 }
 272         }
 273         catch(InvalidPositionException &e){
 274                 succeeded = false;
 275         }
 276
 277         dispatchEvent(&event);
 278
 279         return succeeded;
 280 }
 281
 282 bool Map::removeNodeWithEvent(v3s16 p)
 283 {
 284         MapEditEvent event;
 285         event.type = MEET_REMOVENODE;
 286         event.p = p;
 287
 288         bool succeeded = true;
 289         try{
 290                 std::map<v3s16, MapBlock*> modified_blocks;
 291                 removeNodeAndUpdate(p, modified_blocks);
 292
 293                 // Copy modified_blocks to event
 294                 for (auto &modified_block : modified_blocks) {
 295                         event.modified_blocks.insert(modified_block.first);
 296                 }
 297         }
 298         catch(InvalidPositionException &e){
 299                 succeeded = false;
 300         }
 301
 302         dispatchEvent(&event);
 303
 304         return succeeded;
 305 }
 306
 307 struct TimeOrderedMapBlock {
 308         MapSector *sect;
 309         MapBlock *block;
 310
 311         TimeOrderedMapBlock(MapSector *sect, MapBlock *block) :
 312                 sect(sect),
 313                 block(block)
 314         {}
 315
 316         bool operator<(const TimeOrderedMapBlock &b) const
 317         {
 318                 return block->getUsageTimer() < b.block->getUsageTimer();
 319         };
 320 };
 321
 322 /*
 323         Updates usage timers
 324 */
 325 void Map::timerUpdate(float dtime, float unload_timeout, u32 max_loaded_blocks,
 326                 std::vector<v3s16> *unloaded_blocks)
 327 {
 328         bool save_before_unloading = (mapType() == MAPTYPE_SERVER);
 329
 330         // Profile modified reasons
 331         Profiler modprofiler;
 332
 333         std::vector<v2s16> sector_deletion_queue;
 334         u32 deleted_blocks_count = 0;
 335         u32 saved_blocks_count = 0;
 336         u32 block_count_all = 0;
 337
 338         beginSave();
 339
 340         // If there is no practical limit, we spare creation of mapblock_queue
 341         if (max_loaded_blocks == U32_MAX) {
 342                 for (auto &sector_it : m_sectors) {
 343                         MapSector *sector = sector_it.second;
 344
 345                         bool all_blocks_deleted = true;
 346
 347                         MapBlockVect blocks;
 348                         sector->getBlocks(blocks);
 349
 350                         for (MapBlock *block : blocks) {
 351                                 block->incrementUsageTimer(dtime);
 352
 353                                 if (block->refGet() == 0
 354                                                 && block->getUsageTimer() > unload_timeout) {
 355                                         v3s16 p = block->getPos();
 356
 357                                         // Save if modified
 358                                         if (block->getModified() != MOD_STATE_CLEAN
 359                                                         && save_before_unloading) {
 360                                                 modprofiler.add(block->getModifiedReasonString(), 1);
 361                                                 if (!saveBlock(block))
 362                                                         continue;
 363                                                 saved_blocks_count++;
 364                                         }
 365
 366                                         // Delete from memory
 367                                         sector->deleteBlock(block);
 368
 369                                         if (unloaded_blocks)
 370                                                 unloaded_blocks->push_back(p);
 371
 372                                         deleted_blocks_count++;
 373                                 } else {
 374                                         all_blocks_deleted = false;
 375                                         block_count_all++;
 376                                 }
 377                         }
 378
 379                         if (all_blocks_deleted) {
 380                                 sector_deletion_queue.push_back(sector_it.first);
 381                         }
 382                 }
 383         } else {
 384                 std::priority_queue<TimeOrderedMapBlock> mapblock_queue;
 385                 for (auto &sector_it : m_sectors) {
 386                         MapSector *sector = sector_it.second;
 387
 388                         MapBlockVect blocks;
 389                         sector->getBlocks(blocks);
 390
 391                         for (MapBlock *block : blocks) {
 392                                 block->incrementUsageTimer(dtime);
 393                                 mapblock_queue.push(TimeOrderedMapBlock(sector, block));
 394                         }
 395                 }
 396                 block_count_all = mapblock_queue.size();
 397                 // Delete old blocks, and blocks over the limit from the memory
 398                 while (!mapblock_queue.empty() && (mapblock_queue.size() > max_loaded_blocks
 399                                 || mapblock_queue.top().block->getUsageTimer() > unload_timeout)) {
 400                         TimeOrderedMapBlock b = mapblock_queue.top();
 401                         mapblock_queue.pop();
 402
 403                         MapBlock *block = b.block;
 404
 405                         if (block->refGet() != 0)
 406                                 continue;
 407
 408                         v3s16 p = block->getPos();
 409
 410                         // Save if modified
 411                         if (block->getModified() != MOD_STATE_CLEAN && save_before_unloading) {
 412                                 modprofiler.add(block->getModifiedReasonString(), 1);
 413                                 if (!saveBlock(block))
 414                                         continue;
 415                                 saved_blocks_count++;
 416                         }
 417
 418                         // Delete from memory
 419                         b.sect->deleteBlock(block);
 420
 421                         if (unloaded_blocks)
 422                                 unloaded_blocks->push_back(p);
 423
 424                         deleted_blocks_count++;
 425                         block_count_all--;
 426                 }
 427                 // Delete empty sectors
 428                 for (auto &sector_it : m_sectors) {
 429                         if (sector_it.second->empty()) {
 430                                 sector_deletion_queue.push_back(sector_it.first);
 431                         }
 432                 }
 433         }
 434         endSave();
 435
 436         // Finally delete the empty sectors
 437         deleteSectors(sector_deletion_queue);
 438
 439         if(deleted_blocks_count != 0)
 440         {
 441                 PrintInfo(infostream); // ServerMap/ClientMap:
 442                 infostream<<"Unloaded "<<deleted_blocks_count
 443                                 <<" blocks from memory";
 444                 if(save_before_unloading)
 445                         infostream<<", of which "<<saved_blocks_count<<" were written";
 446                 infostream<<", "<<block_count_all<<" blocks in memory";
 447                 infostream<<"."<<std::endl;
 448                 if(saved_blocks_count != 0){
 449                         PrintInfo(infostream); // ServerMap/ClientMap:
 450                         infostream<<"Blocks modified by: "<<std::endl;
 451                         modprofiler.print(infostream);
 452                 }
 453         }
 454 }
 455
 456 void Map::unloadUnreferencedBlocks(std::vector<v3s16> *unloaded_blocks)
 457 {
 458         timerUpdate(0.0, -1.0, 0, unloaded_blocks);
 459 }
 460
 461 void Map::deleteSectors(std::vector<v2s16> &sectorList)
 462 {
 463         for (v2s16 j : sectorList) {
 464                 MapSector *sector = m_sectors[j];
 465                 // If sector is in sector cache, remove it from there
 466                 if(m_sector_cache == sector)
 467                         m_sector_cache = NULL;
 468                 // Remove from map and delete
 469                 m_sectors.erase(j);
 470                 delete sector;
 471         }
 472 }
 473
 474 void Map::PrintInfo(std::ostream &out)
 475 {
 476         out<<"Map: ";
 477 }
 478
 479 #define WATER_DROP_BOOST 4
 480
 481 enum NeighborType : u8 {
 482         NEIGHBOR_UPPER,
 483         NEIGHBOR_SAME_LEVEL,
 484         NEIGHBOR_LOWER
 485 };
 486
 487 struct NodeNeighbor {
 488         MapNode n;
 489         NeighborType t;
 490         v3s16 p;
 491
 492         NodeNeighbor()
 493                 : n(CONTENT_AIR), t(NEIGHBOR_SAME_LEVEL)
 494         { }
 495
 496         NodeNeighbor(const MapNode &node, NeighborType n_type, const v3s16 &pos)
 497                 : n(node),
 498                   t(n_type),
 499                   p(pos)
 500         { }
 501 };
 502
 503 void Map::transforming_liquid_add(v3s16 p) {
 504         m_transforming_liquid.push_back(p);
 505 }
 506
 507 void Map::transformLiquids(std::map<v3s16, MapBlock*> &modified_blocks,
 508                 ServerEnvironment *env)
 509 {
 510         u32 loopcount = 0;
 511         u32 initial_size = m_transforming_liquid.size();
 512
 513         /*if(initial_size != 0)
 514                 infostream<<"transformLiquids(): initial_size="<<initial_size<<std::endl;*/
 515
 516         // list of nodes that due to viscosity have not reached their max level height
 517         std::deque<v3s16> must_reflow;
 518
 519         std::vector<std::pair<v3s16, MapNode> > changed_nodes;
 520
 521         u32 liquid_loop_max = g_settings->getS32("liquid_loop_max");
 522         u32 loop_max = liquid_loop_max;
 523
 524 #if 0
 525
 526         /* If liquid_loop_max is not keeping up with the queue size increase
 527          * loop_max up to a maximum of liquid_loop_max * dedicated_server_step.
 528          */
 529         if (m_transforming_liquid.size() > loop_max * 2) {
 530                 // "Burst" mode
 531                 float server_step = g_settings->getFloat("dedicated_server_step");
 532                 if (m_transforming_liquid_loop_count_multiplier - 1.0 < server_step)
 533                         m_transforming_liquid_loop_count_multiplier *= 1.0 + server_step / 10;
 534         } else {
 535                 m_transforming_liquid_loop_count_multiplier = 1.0;
 536         }
 537
 538         loop_max *= m_transforming_liquid_loop_count_multiplier;
 539 #endif
 540
 541         while (m_transforming_liquid.size() != 0)
 542         {
 543                 // This should be done here so that it is done when continue is used
 544                 if (loopcount >= initial_size || loopcount >= loop_max)
 545                         break;
 546                 loopcount++;
 547
 548                 /*
 549                         Get a queued transforming liquid node
 550                 */
 551                 v3s16 p0 = m_transforming_liquid.front();
 552                 m_transforming_liquid.pop_front();
 553
 554                 MapNode n0 = getNode(p0);
 555
 556                 /*
 557                         Collect information about current node
 558                  */
 559                 s8 liquid_level = -1;
 560                 // The liquid node which will be placed there if
 561                 // the liquid flows into this node.
 562                 content_t liquid_kind = CONTENT_IGNORE;
 563                 // The node which will be placed there if liquid
 564                 // can't flow into this node.
 565                 content_t floodable_node = CONTENT_AIR;
 566                 const ContentFeatures &cf = m_nodedef->get(n0);
 567                 LiquidType liquid_type = cf.liquid_type;
 568                 switch (liquid_type) {
 569                         case LIQUID_SOURCE:
 570                                 liquid_level = LIQUID_LEVEL_SOURCE;
 571                                 liquid_kind = m_nodedef->getId(cf.liquid_alternative_flowing);
 572                                 break;
 573                         case LIQUID_FLOWING:
 574                                 liquid_level = (n0.param2 & LIQUID_LEVEL_MASK);
 575                                 liquid_kind = n0.getContent();
 576                                 break;
 577                         case LIQUID_NONE:
 578                                 // if this node is 'floodable', it *could* be transformed
 579                                 // into a liquid, otherwise, continue with the next node.
 580                                 if (!cf.floodable)
 581                                         continue;
 582                                 floodable_node = n0.getContent();
 583                                 liquid_kind = CONTENT_AIR;
 584                                 break;
 585                 }
 586
 587                 /*
 588                         Collect information about the environment
 589                  */
 590                 const v3s16 *dirs = g_6dirs;
 591                 NodeNeighbor sources[6]; // surrounding sources
 592                 int num_sources = 0;
 593                 NodeNeighbor flows[6]; // surrounding flowing liquid nodes
 594                 int num_flows = 0;
 595                 NodeNeighbor airs[6]; // surrounding air
 596                 int num_airs = 0;
 597                 NodeNeighbor neutrals[6]; // nodes that are solid or another kind of liquid
 598                 int num_neutrals = 0;
 599                 bool flowing_down = false;
 600                 bool ignored_sources = false;
 601                 for (u16 i = 0; i < 6; i++) {
 602                         NeighborType nt = NEIGHBOR_SAME_LEVEL;
 603                         switch (i) {
 604                                 case 1:
 605                                         nt = NEIGHBOR_UPPER;
 606                                         break;
 607                                 case 4:
 608                                         nt = NEIGHBOR_LOWER;
 609                                         break;
 610                                 default:
 611                                         break;
 612                         }
 613                         v3s16 npos = p0 + dirs[i];
 614                         NodeNeighbor nb(getNode(npos), nt, npos);
 615                         const ContentFeatures &cfnb = m_nodedef->get(nb.n);
 616                         switch (m_nodedef->get(nb.n.getContent()).liquid_type) {
 617                                 case LIQUID_NONE:
 618                                         if (cfnb.floodable) {
 619                                                 airs[num_airs++] = nb;
 620                                                 // if the current node is a water source the neighbor
 621                                                 // should be enqueded for transformation regardless of whether the
 622                                                 // current node changes or not.
 623                                                 if (nb.t != NEIGHBOR_UPPER && liquid_type != LIQUID_NONE)
 624                                                         m_transforming_liquid.push_back(npos);
 625                                                 // if the current node happens to be a flowing node, it will start to flow down here.
 626                                                 if (nb.t == NEIGHBOR_LOWER)
 627                                                         flowing_down = true;
 628                                         } else {
 629                                                 neutrals[num_neutrals++] = nb;
 630                                                 if (nb.n.getContent() == CONTENT_IGNORE) {
 631                                                         // If node below is ignore prevent water from
 632                                                         // spreading outwards and otherwise prevent from
 633                                                         // flowing away as ignore node might be the source
 634                                                         if (nb.t == NEIGHBOR_LOWER)
 635                                                                 flowing_down = true;
 636                                                         else
 637                                                                 ignored_sources = true;
 638                                                 }
 639                                         }
 640                                         break;
 641                                 case LIQUID_SOURCE:
 642                                         // if this node is not (yet) of a liquid type, choose the first liquid type we encounter
 643                                         if (liquid_kind == CONTENT_AIR)
 644                                                 liquid_kind = m_nodedef->getId(cfnb.liquid_alternative_flowing);
 645                                         if (m_nodedef->getId(cfnb.liquid_alternative_flowing) != liquid_kind) {
 646                                                 neutrals[num_neutrals++] = nb;
 647                                         } else {
 648                                                 // Do not count bottom source, it will screw things up
 649                                                 if(dirs[i].Y != -1)
 650                                                         sources[num_sources++] = nb;
 651                                         }
 652                                         break;
 653                                 case LIQUID_FLOWING:
 654                                         // if this node is not (yet) of a liquid type, choose the first liquid type we encounter
 655                                         if (liquid_kind == CONTENT_AIR)
 656                                                 liquid_kind = m_nodedef->getId(cfnb.liquid_alternative_flowing);
 657                                         if (m_nodedef->getId(cfnb.liquid_alternative_flowing) != liquid_kind) {
 658                                                 neutrals[num_neutrals++] = nb;
 659                                         } else {
 660                                                 flows[num_flows++] = nb;
 661                                                 if (nb.t == NEIGHBOR_LOWER)
 662                                                         flowing_down = true;
 663                                         }
 664                                         break;
 665                         }
 666                 }
 667
 668                 /*
 669                         decide on the type (and possibly level) of the current node
 670                  */
 671                 content_t new_node_content;
 672                 s8 new_node_level = -1;
 673                 s8 max_node_level = -1;
 674
 675                 u8 range = m_nodedef->get(liquid_kind).liquid_range;
 676                 if (range > LIQUID_LEVEL_MAX + 1)
 677                         range = LIQUID_LEVEL_MAX + 1;
 678
 679                 if ((num_sources >= 2 && m_nodedef->get(liquid_kind).liquid_renewable) || liquid_type == LIQUID_SOURCE) {
 680                         // liquid_kind will be set to either the flowing alternative of the node (if it's a liquid)
 681                         // or the flowing alternative of the first of the surrounding sources (if it's air), so
 682                         // it's perfectly safe to use liquid_kind here to determine the new node content.
 683                         new_node_content = m_nodedef->getId(m_nodedef->get(liquid_kind).liquid_alternative_source);
 684                 } else if (num_sources >= 1 && sources[0].t != NEIGHBOR_LOWER) {
 685                         // liquid_kind is set properly, see above
 686                         max_node_level = new_node_level = LIQUID_LEVEL_MAX;
 687                         if (new_node_level >= (LIQUID_LEVEL_MAX + 1 - range))
 688                                 new_node_content = liquid_kind;
 689                         else
 690                                 new_node_content = floodable_node;
 691                 } else if (ignored_sources && liquid_level >= 0) {
 692                         // Maybe there are neighbouring sources that aren't loaded yet
 693                         // so prevent flowing away.
 694                         new_node_level = liquid_level;
 695                         new_node_content = liquid_kind;
 696                 } else {
 697                         // no surrounding sources, so get the maximum level that can flow into this node
 698                         for (u16 i = 0; i < num_flows; i++) {
 699                                 u8 nb_liquid_level = (flows[i].n.param2 & LIQUID_LEVEL_MASK);
 700                                 switch (flows[i].t) {
 701                                         case NEIGHBOR_UPPER:
 702                                                 if (nb_liquid_level + WATER_DROP_BOOST > max_node_level) {
 703                                                         max_node_level = LIQUID_LEVEL_MAX;
 704                                                         if (nb_liquid_level + WATER_DROP_BOOST < LIQUID_LEVEL_MAX)
 705                                                                 max_node_level = nb_liquid_level + WATER_DROP_BOOST;
 706                                                 } else if (nb_liquid_level > max_node_level) {
 707                                                         max_node_level = nb_liquid_level;
 708                                                 }
 709                                                 break;
 710                                         case NEIGHBOR_LOWER:
 711                                                 break;
 712                                         case NEIGHBOR_SAME_LEVEL:
 713                                                 if ((flows[i].n.param2 & LIQUID_FLOW_DOWN_MASK) != LIQUID_FLOW_DOWN_MASK &&
 714                                                                 nb_liquid_level > 0 && nb_liquid_level - 1 > max_node_level)
 715                                                         max_node_level = nb_liquid_level - 1;
 716                                                 break;
 717                                 }
 718                         }
 719
 720                         u8 viscosity = m_nodedef->get(liquid_kind).liquid_viscosity;
 721                         if (viscosity > 1 && max_node_level != liquid_level) {
 722                                 // amount to gain, limited by viscosity
 723                                 // must be at least 1 in absolute value
 724                                 s8 level_inc = max_node_level - liquid_level;
 725                                 if (level_inc < -viscosity || level_inc > viscosity)
 726                                         new_node_level = liquid_level + level_inc/viscosity;
 727                                 else if (level_inc < 0)
 728                                         new_node_level = liquid_level - 1;
 729                                 else if (level_inc > 0)
 730                                         new_node_level = liquid_level + 1;
 731                                 if (new_node_level != max_node_level)
 732                                         must_reflow.push_back(p0);
 733                         } else {
 734                                 new_node_level = max_node_level;
 735                         }
 736
 737                         if (max_node_level >= (LIQUID_LEVEL_MAX + 1 - range))
 738                                 new_node_content = liquid_kind;
 739                         else
 740                                 new_node_content = floodable_node;
 741
 742                 }
 743
 744                 /*
 745                         check if anything has changed. if not, just continue with the next node.
 746                  */
 747                 if (new_node_content == n0.getContent() &&
 748                                 (m_nodedef->get(n0.getContent()).liquid_type != LIQUID_FLOWING ||
 749                                 ((n0.param2 & LIQUID_LEVEL_MASK) == (u8)new_node_level &&
 750                                 ((n0.param2 & LIQUID_FLOW_DOWN_MASK) == LIQUID_FLOW_DOWN_MASK)
 751                                 == flowing_down)))
 752                         continue;
 753
 754
 755                 /*
 756                         update the current node
 757                  */
 758                 MapNode n00 = n0;
 759                 //bool flow_down_enabled = (flowing_down && ((n0.param2 & LIQUID_FLOW_DOWN_MASK) != LIQUID_FLOW_DOWN_MASK));
 760                 if (m_nodedef->get(new_node_content).liquid_type == LIQUID_FLOWING) {
 761                         // set level to last 3 bits, flowing down bit to 4th bit
 762                         n0.param2 = (flowing_down ? LIQUID_FLOW_DOWN_MASK : 0x00) | (new_node_level & LIQUID_LEVEL_MASK);
 763                 } else {
 764                         // set the liquid level and flow bit to 0
 765                         n0.param2 = ~(LIQUID_LEVEL_MASK | LIQUID_FLOW_DOWN_MASK);
 766                 }
 767
 768                 // change the node.
 769                 n0.setContent(new_node_content);
 770
 771                 // on_flood() the node
 772                 if (floodable_node != CONTENT_AIR) {
 773                         if (env->getScriptIface()->node_on_flood(p0, n00, n0))
 774                                 continue;
 775                 }
 776
 777                 // Ignore light (because calling voxalgo::update_lighting_nodes)
 778                 n0.setLight(LIGHTBANK_DAY, 0, m_nodedef);
 779                 n0.setLight(LIGHTBANK_NIGHT, 0, m_nodedef);
 780
 781                 // Find out whether there is a suspect for this action
 782                 std::string suspect;
 783                 if (m_gamedef->rollback())
 784                         suspect = m_gamedef->rollback()->getSuspect(p0, 83, 1);
 785
 786                 if (m_gamedef->rollback() && !suspect.empty()) {
 787                         // Blame suspect
 788                         RollbackScopeActor rollback_scope(m_gamedef->rollback(), suspect, true);
 789                         // Get old node for rollback
 790                         RollbackNode rollback_oldnode(this, p0, m_gamedef);
 791                         // Set node
 792                         setNode(p0, n0);
 793                         // Report
 794                         RollbackNode rollback_newnode(this, p0, m_gamedef);
 795                         RollbackAction action;
 796                         action.setSetNode(p0, rollback_oldnode, rollback_newnode);
 797                         m_gamedef->rollback()->reportAction(action);
 798                 } else {
 799                         // Set node
 800                         setNode(p0, n0);
 801                 }
 802
 803                 v3s16 blockpos = getNodeBlockPos(p0);
 804                 MapBlock *block = getBlockNoCreateNoEx(blockpos);
 805                 if (block != NULL) {
 806                         modified_blocks[blockpos] =  block;
 807                         changed_nodes.emplace_back(p0, n00);
 808                 }
 809
 810                 /*
 811                         enqueue neighbors for update if neccessary
 812                  */
 813                 switch (m_nodedef->get(n0.getContent()).liquid_type) {
 814                         case LIQUID_SOURCE:
 815                         case LIQUID_FLOWING:
 816                                 // make sure source flows into all neighboring nodes
 817                                 for (u16 i = 0; i < num_flows; i++)
 818                                         if (flows[i].t != NEIGHBOR_UPPER)
 819                                                 m_transforming_liquid.push_back(flows[i].p);
 820                                 for (u16 i = 0; i < num_airs; i++)
 821                                         if (airs[i].t != NEIGHBOR_UPPER)
 822                                                 m_transforming_liquid.push_back(airs[i].p);
 823                                 break;
 824                         case LIQUID_NONE:
 825                                 // this flow has turned to air; neighboring flows might need to do the same
 826                                 for (u16 i = 0; i < num_flows; i++)
 827                                         m_transforming_liquid.push_back(flows[i].p);
 828                                 break;
 829                 }
 830         }
 831         //infostream<<"Map::transformLiquids(): loopcount="<<loopcount<<std::endl;
 832
 833         for (auto &iter : must_reflow)
 834                 m_transforming_liquid.push_back(iter);
 835
 836         voxalgo::update_lighting_nodes(this, changed_nodes, modified_blocks);
 837
 838
 839         /* ----------------------------------------------------------------------
 840          * Manage the queue so that it does not grow indefinately
 841          */
 842         u16 time_until_purge = g_settings->getU16("liquid_queue_purge_time");
 843
 844         if (time_until_purge == 0)
 845                 return; // Feature disabled
 846
 847         time_until_purge *= 1000;       // seconds -> milliseconds
 848
 849         u64 curr_time = porting::getTimeMs();
 850         u32 prev_unprocessed = m_unprocessed_count;
 851         m_unprocessed_count = m_transforming_liquid.size();
 852
 853         // if unprocessed block count is decreasing or stable
 854         if (m_unprocessed_count <= prev_unprocessed) {
 855                 m_queue_size_timer_started = false;
 856         } else {
 857                 if (!m_queue_size_timer_started)
 858                         m_inc_trending_up_start_time = curr_time;
 859                 m_queue_size_timer_started = true;
 860         }
 861
 862         // Account for curr_time overflowing
 863         if (m_queue_size_timer_started && m_inc_trending_up_start_time > curr_time)
 864                 m_queue_size_timer_started = false;
 865
 866         /* If the queue has been growing for more than liquid_queue_purge_time seconds
 867          * and the number of unprocessed blocks is still > liquid_loop_max then we
 868          * cannot keep up; dump the oldest blocks from the queue so that the queue
 869          * has liquid_loop_max items in it
 870          */
 871         if (m_queue_size_timer_started
 872                         && curr_time - m_inc_trending_up_start_time > time_until_purge
 873                         && m_unprocessed_count > liquid_loop_max) {
 874
 875                 size_t dump_qty = m_unprocessed_count - liquid_loop_max;
 876
 877                 infostream << "transformLiquids(): DUMPING " << dump_qty
 878                            << " blocks from the queue" << std::endl;
 879
 880                 while (dump_qty--)
 881                         m_transforming_liquid.pop_front();
 882
 883                 m_queue_size_timer_started = false; // optimistically assume we can keep up now
 884                 m_unprocessed_count = m_transforming_liquid.size();
 885         }
 886 }
 887
 888 std::vector<v3s16> Map::findNodesWithMetadata(v3s16 p1, v3s16 p2)
 889 {
 890         std::vector<v3s16> positions_with_meta;
 891
 892         sortBoxVerticies(p1, p2);
 893         v3s16 bpmin = getNodeBlockPos(p1);
 894         v3s16 bpmax = getNodeBlockPos(p2);
 895
 896         VoxelArea area(p1, p2);
 897
 898         for (s16 z = bpmin.Z; z <= bpmax.Z; z++)
 899         for (s16 y = bpmin.Y; y <= bpmax.Y; y++)
 900         for (s16 x = bpmin.X; x <= bpmax.X; x++) {
 901                 v3s16 blockpos(x, y, z);
 902
 903                 MapBlock *block = getBlockNoCreateNoEx(blockpos);
 904                 if (!block) {
 905                         verbosestream << "Map::getNodeMetadata(): Need to emerge "
 906                                 << PP(blockpos) << std::endl;
 907                         block = emergeBlock(blockpos, false);
 908                 }
 909                 if (!block) {
 910                         infostream << "WARNING: Map::getNodeMetadata(): Block not found"
 911                                 << std::endl;
 912                         continue;
 913                 }
 914
 915                 v3s16 p_base = blockpos * MAP_BLOCKSIZE;
 916                 std::vector<v3s16> keys = block->m_node_metadata.getAllKeys();
 917                 for (size_t i = 0; i != keys.size(); i++) {
 918                         v3s16 p(keys[i] + p_base);
 919                         if (!area.contains(p))
 920                                 continue;
 921
 922                         positions_with_meta.push_back(p);
 923                 }
 924         }
 925
 926         return positions_with_meta;
 927 }
 928
 929 NodeMetadata *Map::getNodeMetadata(v3s16 p)
 930 {
 931         v3s16 blockpos = getNodeBlockPos(p);
 932         v3s16 p_rel = p - blockpos*MAP_BLOCKSIZE;
 933         MapBlock *block = getBlockNoCreateNoEx(blockpos);
 934         if(!block){
 935                 infostream<<"Map::getNodeMetadata(): Need to emerge "
 936                                 <<PP(blockpos)<<std::endl;
 937                 block = emergeBlock(blockpos, false);
 938         }
 939         if(!block){
 940                 warningstream<<"Map::getNodeMetadata(): Block not found"
 941                                 <<std::endl;
 942                 return NULL;
 943         }
 944         NodeMetadata *meta = block->m_node_metadata.get(p_rel);
 945         return meta;
 946 }
 947
 948 bool Map::setNodeMetadata(v3s16 p, NodeMetadata *meta)
 949 {
 950         v3s16 blockpos = getNodeBlockPos(p);
 951         v3s16 p_rel = p - blockpos*MAP_BLOCKSIZE;
 952         MapBlock *block = getBlockNoCreateNoEx(blockpos);
 953         if(!block){
 954                 infostream<<"Map::setNodeMetadata(): Need to emerge "
 955                                 <<PP(blockpos)<<std::endl;
 956                 block = emergeBlock(blockpos, false);
 957         }
 958         if(!block){
 959                 warningstream<<"Map::setNodeMetadata(): Block not found"
 960                                 <<std::endl;
 961                 return false;
 962         }
 963         block->m_node_metadata.set(p_rel, meta);
 964         return true;
 965 }
 966
 967 void Map::removeNodeMetadata(v3s16 p)
 968 {
 969         v3s16 blockpos = getNodeBlockPos(p);
 970         v3s16 p_rel = p - blockpos*MAP_BLOCKSIZE;
 971         MapBlock *block = getBlockNoCreateNoEx(blockpos);
 972         if(block == NULL)
 973         {
 974                 warningstream<<"Map::removeNodeMetadata(): Block not found"
 975                                 <<std::endl;
 976                 return;
 977         }
 978         block->m_node_metadata.remove(p_rel);
 979 }
 980
 981 NodeTimer Map::getNodeTimer(v3s16 p)
 982 {
 983         v3s16 blockpos = getNodeBlockPos(p);
 984         v3s16 p_rel = p - blockpos*MAP_BLOCKSIZE;
 985         MapBlock *block = getBlockNoCreateNoEx(blockpos);
 986         if(!block){
 987                 infostream<<"Map::getNodeTimer(): Need to emerge "
 988                                 <<PP(blockpos)<<std::endl;
 989                 block = emergeBlock(blockpos, false);
 990         }
 991         if(!block){
 992                 warningstream<<"Map::getNodeTimer(): Block not found"
 993                                 <<std::endl;
 994                 return NodeTimer();
 995         }
 996         NodeTimer t = block->m_node_timers.get(p_rel);
 997         NodeTimer nt(t.timeout, t.elapsed, p);
 998         return nt;
 999 }
1000
1001 void Map::setNodeTimer(const NodeTimer &t)
1002 {
1003         v3s16 p = t.position;
1004         v3s16 blockpos = getNodeBlockPos(p);
1005         v3s16 p_rel = p - blockpos*MAP_BLOCKSIZE;
1006         MapBlock *block = getBlockNoCreateNoEx(blockpos);
1007         if(!block){
1008                 infostream<<"Map::setNodeTimer(): Need to emerge "
1009                                 <<PP(blockpos)<<std::endl;
1010                 block = emergeBlock(blockpos, false);
1011         }
1012         if(!block){
1013                 warningstream<<"Map::setNodeTimer(): Block not found"
1014                                 <<std::endl;
1015                 return;
1016         }
1017         NodeTimer nt(t.timeout, t.elapsed, p_rel);
1018         block->m_node_timers.set(nt);
1019 }
1020
1021 void Map::removeNodeTimer(v3s16 p)
1022 {
1023         v3s16 blockpos = getNodeBlockPos(p);
1024         v3s16 p_rel = p - blockpos*MAP_BLOCKSIZE;
1025         MapBlock *block = getBlockNoCreateNoEx(blockpos);
1026         if(block == NULL)
1027         {
1028                 warningstream<<"Map::removeNodeTimer(): Block not found"
1029                                 <<std::endl;
1030                 return;
1031         }
1032         block->m_node_timers.remove(p_rel);
1033 }
1034
1035 bool Map::isOccluded(const v3s16 &pos_camera, const v3s16 &pos_target,
1036         float step, float stepfac, float offset, float end_offset, u32 needed_count)
1037 {
1038         v3f direction = intToFloat(pos_target - pos_camera, BS);
1039         float distance = direction.getLength();
1040
1041         // Normalize direction vector
1042         if (distance > 0.0f)
1043                 direction /= distance;
1044
1045         v3f pos_origin_f = intToFloat(pos_camera, BS);
1046         u32 count = 0;
1047         bool is_valid_position;
1048
1049         for (; offset < distance + end_offset; offset += step) {
1050                 v3f pos_node_f = pos_origin_f + direction * offset;
1051                 v3s16 pos_node = floatToInt(pos_node_f, BS);
1052
1053                 MapNode node = getNode(pos_node, &is_valid_position);
1054
1055                 if (is_valid_position &&
1056                                 !m_nodedef->get(node).light_propagates) {
1057                         // Cannot see through light-blocking nodes --> occluded
1058                         count++;
1059                         if (count >= needed_count)
1060                                 return true;
1061                 }
1062                 step *= stepfac;
1063         }
1064         return false;
1065 }
1066
1067 bool Map::isBlockOccluded(MapBlock *block, v3s16 cam_pos_nodes)
1068 {
1069         // Check occlusion for center and all 8 corners of the mapblock
1070         // Overshoot a little for less flickering
1071         static const s16 bs2 = MAP_BLOCKSIZE / 2 + 1;
1072         static const v3s16 dir9[9] = {
1073                 v3s16( 0,  0,  0),
1074                 v3s16( 1,  1,  1) * bs2,
1075                 v3s16( 1,  1, -1) * bs2,
1076                 v3s16( 1, -1,  1) * bs2,
1077                 v3s16( 1, -1, -1) * bs2,
1078                 v3s16(-1,  1,  1) * bs2,
1079                 v3s16(-1,  1, -1) * bs2,
1080                 v3s16(-1, -1,  1) * bs2,
1081                 v3s16(-1, -1, -1) * bs2,
1082         };
1083
1084         v3s16 pos_blockcenter = block->getPosRelative() + (MAP_BLOCKSIZE / 2);
1085
1086         // Starting step size, value between 1m and sqrt(3)m
1087         float step = BS * 1.2f;
1088         // Multiply step by each iteraction by 'stepfac' to reduce checks in distance
1089         float stepfac = 1.05f;
1090
1091         float start_offset = BS * 1.0f;
1092
1093         // The occlusion search of 'isOccluded()' must stop short of the target
1094         // point by distance 'end_offset' to not enter the target mapblock.
1095         // For the 8 mapblock corners 'end_offset' must therefore be the maximum
1096         // diagonal of a mapblock, because we must consider all view angles.
1097         // sqrt(1^2 + 1^2 + 1^2) = 1.732
1098         float end_offset = -BS * MAP_BLOCKSIZE * 1.732f;
1099
1100         // to reduce the likelihood of falsely occluded blocks
1101         // require at least two solid blocks
1102         // this is a HACK, we should think of a more precise algorithm
1103         u32 needed_count = 2;
1104
1105         for (const v3s16 &dir : dir9) {
1106                 if (!isOccluded(cam_pos_nodes, pos_blockcenter + dir, step, stepfac,
1107                                 start_offset, end_offset, needed_count))
1108                         return false;
1109         }
1110         return true;
1111 }
1112
1113 /*
1114         ServerMap
1115 */
1116 ServerMap::ServerMap(const std::string &savedir, IGameDef *gamedef,
1117                 EmergeManager *emerge):
1118         Map(dout_server, gamedef),
1119         settings_mgr(g_settings, savedir + DIR_DELIM + "map_meta.txt"),
1120         m_emerge(emerge)
1121 {
1122         verbosestream<<FUNCTION_NAME<<std::endl;
1123
1124         // Tell the EmergeManager about our MapSettingsManager
1125         emerge->map_settings_mgr = &settings_mgr;
1126
1127         /*
1128                 Try to load map; if not found, create a new one.
1129         */
1130
1131         // Determine which database backend to use
1132         std::string conf_path = savedir + DIR_DELIM + "world.mt";
1133         Settings conf;
1134         bool succeeded = conf.readConfigFile(conf_path.c_str());
1135         if (!succeeded || !conf.exists("backend")) {
1136                 // fall back to sqlite3
1137                 conf.set("backend", "sqlite3");
1138         }
1139         std::string backend = conf.get("backend");
1140         dbase = createDatabase(backend, savedir, conf);
1141         if (conf.exists("readonly_backend")) {
1142                 std::string readonly_dir = savedir + DIR_DELIM + "readonly";
1143                 dbase_ro = createDatabase(conf.get("readonly_backend"), readonly_dir, conf);
1144         }
1145         if (!conf.updateConfigFile(conf_path.c_str()))
1146                 errorstream << "ServerMap::ServerMap(): Failed to update world.mt!" << std::endl;
1147
1148         m_savedir = savedir;
1149         m_map_saving_enabled = false;
1150
1151         try {
1152                 // If directory exists, check contents and load if possible
1153                 if (fs::PathExists(m_savedir)) {
1154                         // If directory is empty, it is safe to save into it.
1155                         if (fs::GetDirListing(m_savedir).empty()) {
1156                                 infostream<<"ServerMap: Empty save directory is valid."
1157                                                 <<std::endl;
1158                                 m_map_saving_enabled = true;
1159                         }
1160                         else
1161                         {
1162
1163                                 if (settings_mgr.loadMapMeta()) {
1164                                         infostream << "ServerMap: Metadata loaded from "
1165                                                 << savedir << std::endl;
1166                                 } else {
1167                                         infostream << "ServerMap: Metadata could not be loaded "
1168                                                 "from " << savedir << ", assuming valid save "
1169                                                 "directory." << std::endl;
1170                                 }
1171
1172                                 m_map_saving_enabled = true;
1173                                 // Map loaded, not creating new one
1174                                 return;
1175                         }
1176                 }
1177                 // If directory doesn't exist, it is safe to save to it
1178                 else{
1179                         m_map_saving_enabled = true;
1180                 }
1181         }
1182         catch(std::exception &e)
1183         {
1184                 warningstream<<"ServerMap: Failed to load map from "<<savedir
1185                                 <<", exception: "<<e.what()<<std::endl;
1186                 infostream<<"Please remove the map or fix it."<<std::endl;
1187                 warningstream<<"Map saving will be disabled."<<std::endl;
1188         }
1189 }
1190
1191 ServerMap::~ServerMap()
1192 {
1193         verbosestream<<FUNCTION_NAME<<std::endl;
1194
1195         try
1196         {
1197                 if (m_map_saving_enabled) {
1198                         // Save only changed parts
1199                         save(MOD_STATE_WRITE_AT_UNLOAD);
1200                         infostream << "ServerMap: Saved map to " << m_savedir << std::endl;
1201                 } else {
1202                         infostream << "ServerMap: Map not saved" << std::endl;
1203                 }
1204         }
1205         catch(std::exception &e)
1206         {
1207                 infostream<<"ServerMap: Failed to save map to "<<m_savedir
1208                                 <<", exception: "<<e.what()<<std::endl;
1209         }
1210
1211         /*
1212                 Close database if it was opened
1213         */
1214         delete dbase;
1215         if (dbase_ro)
1216                 delete dbase_ro;
1217
1218 #if 0
1219         /*
1220                 Free all MapChunks
1221         */
1222         core::map<v2s16, MapChunk*>::Iterator i = m_chunks.getIterator();
1223         for(; i.atEnd() == false; i++)
1224         {
1225                 MapChunk *chunk = i.getNode()->getValue();
1226                 delete chunk;
1227         }
1228 #endif
1229 }
1230
1231 MapgenParams *ServerMap::getMapgenParams()
1232 {
1233         // getMapgenParams() should only ever be called after Server is initialized
1234         assert(settings_mgr.mapgen_params != NULL);
1235         return settings_mgr.mapgen_params;
1236 }
1237
1238 u64 ServerMap::getSeed()
1239 {
1240         return getMapgenParams()->seed;
1241 }
1242
1243 s16 ServerMap::getWaterLevel()
1244 {
1245         return getMapgenParams()->water_level;
1246 }
1247
1248 bool ServerMap::blockpos_over_mapgen_limit(v3s16 p)
1249 {
1250         const s16 mapgen_limit_bp = rangelim(
1251                 getMapgenParams()->mapgen_limit, 0, MAX_MAP_GENERATION_LIMIT) /
1252                 MAP_BLOCKSIZE;
1253         return p.X < -mapgen_limit_bp ||
1254                 p.X >  mapgen_limit_bp ||
1255                 p.Y < -mapgen_limit_bp ||
1256                 p.Y >  mapgen_limit_bp ||
1257                 p.Z < -mapgen_limit_bp ||
1258                 p.Z >  mapgen_limit_bp;
1259 }
1260
1261 bool ServerMap::initBlockMake(v3s16 blockpos, BlockMakeData *data)
1262 {
1263         s16 csize = getMapgenParams()->chunksize;
1264         v3s16 bpmin = EmergeManager::getContainingChunk(blockpos, csize);
1265         v3s16 bpmax = bpmin + v3s16(1, 1, 1) * (csize - 1);
1266
1267         bool enable_mapgen_debug_info = m_emerge->enable_mapgen_debug_info;
1268         EMERGE_DBG_OUT("initBlockMake(): " PP(bpmin) " - " PP(bpmax));
1269
1270         v3s16 extra_borders(1, 1, 1);
1271         v3s16 full_bpmin = bpmin - extra_borders;
1272         v3s16 full_bpmax = bpmax + extra_borders;
1273
1274         // Do nothing if not inside mapgen limits (+-1 because of neighbors)
1275         if (blockpos_over_mapgen_limit(full_bpmin) ||
1276                         blockpos_over_mapgen_limit(full_bpmax))
1277                 return false;
1278
1279         data->seed = getSeed();
1280         data->blockpos_min = bpmin;
1281         data->blockpos_max = bpmax;
1282         data->blockpos_requested = blockpos;
1283         data->nodedef = m_nodedef;
1284
1285         /*
1286                 Create the whole area of this and the neighboring blocks
1287         */
1288         for (s16 x = full_bpmin.X; x <= full_bpmax.X; x++)
1289         for (s16 z = full_bpmin.Z; z <= full_bpmax.Z; z++) {
1290                 v2s16 sectorpos(x, z);
1291                 // Sector metadata is loaded from disk if not already loaded.
1292                 MapSector *sector = createSector(sectorpos);
1293                 FATAL_ERROR_IF(sector == NULL, "createSector() failed");
1294
1295                 for (s16 y = full_bpmin.Y; y <= full_bpmax.Y; y++) {
1296                         v3s16 p(x, y, z);
1297
1298                         MapBlock *block = emergeBlock(p, false);
1299                         if (block == NULL) {
1300                                 block = createBlock(p);
1301
1302                                 // Block gets sunlight if this is true.
1303                                 // Refer to the map generator heuristics.
1304                                 bool ug = m_emerge->isBlockUnderground(p);
1305                                 block->setIsUnderground(ug);
1306                         }
1307                 }
1308         }
1309
1310         /*
1311                 Now we have a big empty area.
1312
1313                 Make a ManualMapVoxelManipulator that contains this and the
1314                 neighboring blocks
1315         */
1316
1317         data->vmanip = new MMVManip(this);
1318         data->vmanip->initialEmerge(full_bpmin, full_bpmax);
1319
1320         // Note: we may need this again at some point.
1321 #if 0
1322         // Ensure none of the blocks to be generated were marked as
1323         // containing CONTENT_IGNORE
1324         for (s16 z = blockpos_min.Z; z <= blockpos_max.Z; z++) {
1325                 for (s16 y = blockpos_min.Y; y <= blockpos_max.Y; y++) {
1326                         for (s16 x = blockpos_min.X; x <= blockpos_max.X; x++) {
1327                                 core::map<v3s16, u8>::Node *n;
1328                                 n = data->vmanip->m_loaded_blocks.find(v3s16(x, y, z));
1329                                 if (n == NULL)
1330                                         continue;
1331                                 u8 flags = n->getValue();
1332                                 flags &= ~VMANIP_BLOCK_CONTAINS_CIGNORE;
1333                                 n->setValue(flags);
1334                         }
1335                 }
1336         }
1337 #endif
1338
1339         // Data is ready now.
1340         return true;
1341 }
1342
1343 void ServerMap::finishBlockMake(BlockMakeData *data,
1344         std::map<v3s16, MapBlock*> *changed_blocks)
1345 {
1346         v3s16 bpmin = data->blockpos_min;
1347         v3s16 bpmax = data->blockpos_max;
1348
1349         v3s16 extra_borders(1, 1, 1);
1350
1351         bool enable_mapgen_debug_info = m_emerge->enable_mapgen_debug_info;
1352         EMERGE_DBG_OUT("finishBlockMake(): " PP(bpmin) " - " PP(bpmax));
1353
1354         /*
1355                 Blit generated stuff to map
1356                 NOTE: blitBackAll adds nearly everything to changed_blocks
1357         */
1358         data->vmanip->blitBackAll(changed_blocks);
1359
1360         EMERGE_DBG_OUT("finishBlockMake: changed_blocks.size()="
1361                 << changed_blocks->size());
1362
1363         /*
1364                 Copy transforming liquid information
1365         */
1366         while (data->transforming_liquid.size()) {
1367                 m_transforming_liquid.push_back(data->transforming_liquid.front());
1368                 data->transforming_liquid.pop_front();
1369         }
1370
1371         for (auto &changed_block : *changed_blocks) {
1372                 MapBlock *block = changed_block.second;
1373                 if (!block)
1374                         continue;
1375                 /*
1376                         Update day/night difference cache of the MapBlocks
1377                 */
1378                 block->expireDayNightDiff();
1379                 /*
1380                         Set block as modified
1381                 */
1382                 block->raiseModified(MOD_STATE_WRITE_NEEDED,
1383                         MOD_REASON_EXPIRE_DAYNIGHTDIFF);
1384         }
1385
1386         /*
1387                 Set central blocks as generated
1388         */
1389         for (s16 x = bpmin.X; x <= bpmax.X; x++)
1390         for (s16 z = bpmin.Z; z <= bpmax.Z; z++)
1391         for (s16 y = bpmin.Y; y <= bpmax.Y; y++) {
1392                 MapBlock *block = getBlockNoCreateNoEx(v3s16(x, y, z));
1393                 if (!block)
1394                         continue;
1395
1396                 block->setGenerated(true);
1397         }
1398
1399         /*
1400                 Save changed parts of map
1401                 NOTE: Will be saved later.
1402         */
1403         //save(MOD_STATE_WRITE_AT_UNLOAD);
1404 }
1405
1406 MapSector *ServerMap::createSector(v2s16 p2d)
1407 {
1408         /*
1409                 Check if it exists already in memory
1410         */
1411         MapSector *sector = getSectorNoGenerate(p2d);
1412         if (sector)
1413                 return sector;
1414
1415         /*
1416                 Do not create over max mapgen limit
1417         */
1418         const s16 max_limit_bp = MAX_MAP_GENERATION_LIMIT / MAP_BLOCKSIZE;
1419         if (p2d.X < -max_limit_bp ||
1420                         p2d.X >  max_limit_bp ||
1421                         p2d.Y < -max_limit_bp ||
1422                         p2d.Y >  max_limit_bp)
1423                 throw InvalidPositionException("createSector(): pos. over max mapgen limit");
1424
1425         /*
1426                 Generate blank sector
1427         */
1428
1429         sector = new MapSector(this, p2d, m_gamedef);
1430
1431         // Sector position on map in nodes
1432         //v2s16 nodepos2d = p2d * MAP_BLOCKSIZE;
1433
1434         /*
1435                 Insert to container
1436         */
1437         m_sectors[p2d] = sector;
1438
1439         return sector;
1440 }
1441
1442 #if 0
1443 /*
1444         This is a quick-hand function for calling makeBlock().
1445 */
1446 MapBlock * ServerMap::generateBlock(
1447                 v3s16 p,
1448                 std::map<v3s16, MapBlock*> &modified_blocks
1449 )
1450 {
1451         bool enable_mapgen_debug_info = g_settings->getBool("enable_mapgen_debug_info");
1452
1453         TimeTaker timer("generateBlock");
1454
1455         //MapBlock *block = original_dummy;
1456
1457         v2s16 p2d(p.X, p.Z);
1458         v2s16 p2d_nodes = p2d * MAP_BLOCKSIZE;
1459
1460         /*
1461                 Do not generate over-limit
1462         */
1463         if(blockpos_over_limit(p))
1464         {
1465                 infostream<<FUNCTION_NAME<<": Block position over limit"<<std::endl;
1466                 throw InvalidPositionException("generateBlock(): pos. over limit");
1467         }
1468
1469         /*
1470                 Create block make data
1471         */
1472         BlockMakeData data;
1473         initBlockMake(&data, p);
1474
1475         /*
1476                 Generate block
1477         */
1478         {
1479                 TimeTaker t("mapgen::make_block()");
1480                 mapgen->makeChunk(&data);
1481                 //mapgen::make_block(&data);
1482
1483                 if(enable_mapgen_debug_info == false)
1484                         t.stop(true); // Hide output
1485         }
1486
1487         /*
1488                 Blit data back on map, update lighting, add mobs and whatever this does
1489         */
1490         finishBlockMake(&data, modified_blocks);
1491
1492         /*
1493                 Get central block
1494         */
1495         MapBlock *block = getBlockNoCreateNoEx(p);
1496
1497 #if 0
1498         /*
1499                 Check result
1500         */
1501         if(block)
1502         {
1503                 bool erroneus_content = false;
1504                 for(s16 z0=0; z0<MAP_BLOCKSIZE; z0++)
1505                 for(s16 y0=0; y0<MAP_BLOCKSIZE; y0++)
1506                 for(s16 x0=0; x0<MAP_BLOCKSIZE; x0++)
1507                 {
1508                         v3s16 p(x0,y0,z0);
1509                         MapNode n = block->getNode(p);
1510                         if(n.getContent() == CONTENT_IGNORE)
1511                         {
1512                                 infostream<<"CONTENT_IGNORE at "
1513                                                 <<"("<<p.X<<","<<p.Y<<","<<p.Z<<")"
1514                                                 <<std::endl;
1515                                 erroneus_content = true;
1516                                 assert(0);
1517                         }
1518                 }
1519                 if(erroneus_content)
1520                 {
1521                         assert(0);
1522                 }
1523         }
1524 #endif
1525
1526 #if 0
1527         /*
1528                 Generate a completely empty block
1529         */
1530         if(block)
1531         {
1532                 for(s16 z0=0; z0<MAP_BLOCKSIZE; z0++)
1533                 for(s16 x0=0; x0<MAP_BLOCKSIZE; x0++)
1534                 {
1535                         for(s16 y0=0; y0<MAP_BLOCKSIZE; y0++)
1536                         {
1537                                 MapNode n;
1538                                 n.setContent(CONTENT_AIR);
1539                                 block->setNode(v3s16(x0,y0,z0), n);
1540                         }
1541                 }
1542         }
1543 #endif
1544
1545         if(enable_mapgen_debug_info == false)
1546                 timer.stop(true); // Hide output
1547
1548         return block;
1549 }
1550 #endif
1551
1552 MapBlock * ServerMap::createBlock(v3s16 p)
1553 {
1554         /*
1555                 Do not create over max mapgen limit
1556         */
1557         if (blockpos_over_max_limit(p))
1558                 throw InvalidPositionException("createBlock(): pos. over max mapgen limit");
1559
1560         v2s16 p2d(p.X, p.Z);
1561         s16 block_y = p.Y;
1562         /*
1563                 This will create or load a sector if not found in memory.
1564                 If block exists on disk, it will be loaded.
1565
1566                 NOTE: On old save formats, this will be slow, as it generates
1567                       lighting on blocks for them.
1568         */
1569         MapSector *sector;
1570         try {
1571                 sector = createSector(p2d);
1572         } catch (InvalidPositionException &e) {
1573                 infostream<<"createBlock: createSector() failed"<<std::endl;
1574                 throw e;
1575         }
1576
1577         /*
1578                 Try to get a block from the sector
1579         */
1580
1581         MapBlock *block = sector->getBlockNoCreateNoEx(block_y);
1582         if (block) {
1583                 if(block->isDummy())
1584                         block->unDummify();
1585                 return block;
1586         }
1587         // Create blank
1588         block = sector->createBlankBlock(block_y);
1589
1590         return block;
1591 }
1592
1593 MapBlock * ServerMap::emergeBlock(v3s16 p, bool create_blank)
1594 {
1595         {
1596                 MapBlock *block = getBlockNoCreateNoEx(p);
1597                 if (block && !block->isDummy())
1598                         return block;
1599         }
1600
1601         {
1602                 MapBlock *block = loadBlock(p);
1603                 if(block)
1604                         return block;
1605         }
1606
1607         if (create_blank) {
1608                 MapSector *sector = createSector(v2s16(p.X, p.Z));
1609                 MapBlock *block = sector->createBlankBlock(p.Y);
1610
1611                 return block;
1612         }
1613
1614         return NULL;
1615 }
1616
1617 MapBlock *ServerMap::getBlockOrEmerge(v3s16 p3d)
1618 {
1619         MapBlock *block = getBlockNoCreateNoEx(p3d);
1620         if (block == NULL)
1621                 m_emerge->enqueueBlockEmerge(PEER_ID_INEXISTENT, p3d, false);
1622
1623         return block;
1624 }
1625
1626 // N.B.  This requires no synchronization, since data will not be modified unless
1627 // the VoxelManipulator being updated belongs to the same thread.
1628 void ServerMap::updateVManip(v3s16 pos)
1629 {
1630         Mapgen *mg = m_emerge->getCurrentMapgen();
1631         if (!mg)
1632                 return;
1633
1634         MMVManip *vm = mg->vm;
1635         if (!vm)
1636                 return;
1637
1638         if (!vm->m_area.contains(pos))
1639                 return;
1640
1641         s32 idx = vm->m_area.index(pos);
1642         vm->m_data[idx] = getNode(pos);
1643         vm->m_flags[idx] &= ~VOXELFLAG_NO_DATA;
1644
1645         vm->m_is_dirty = true;
1646 }
1647
1648 s16 ServerMap::findGroundLevel(v2s16 p2d)
1649 {
1650 #if 0
1651         /*
1652                 Uh, just do something random...
1653         */
1654         // Find existing map from top to down
1655         s16 max=63;
1656         s16 min=-64;
1657         v3s16 p(p2d.X, max, p2d.Y);
1658         for(; p.Y>min; p.Y--)
1659         {
1660                 MapNode n = getNodeNoEx(p);
1661                 if(n.getContent() != CONTENT_IGNORE)
1662                         break;
1663         }
1664         if(p.Y == min)
1665                 goto plan_b;
1666         // If this node is not air, go to plan b
1667         if(getNodeNoEx(p).getContent() != CONTENT_AIR)
1668                 goto plan_b;
1669         // Search existing walkable and return it
1670         for(; p.Y>min; p.Y--)
1671         {
1672                 MapNode n = getNodeNoEx(p);
1673                 if(content_walkable(n.d) && n.getContent() != CONTENT_IGNORE)
1674                         return p.Y;
1675         }
1676
1677         // Move to plan b
1678 plan_b:
1679 #endif
1680
1681         /*
1682                 Determine from map generator noise functions
1683         */
1684
1685         s16 level = m_emerge->getGroundLevelAtPoint(p2d);
1686         return level;
1687
1688         //double level = base_rock_level_2d(m_seed, p2d) + AVERAGE_MUD_AMOUNT;
1689         //return (s16)level;
1690 }
1691
1692 bool ServerMap::loadFromFolders() {
1693         if (!dbase->initialized() &&
1694                         !fs::PathExists(m_savedir + DIR_DELIM + "map.sqlite"))
1695                 return true;
1696         return false;
1697 }
1698
1699 void ServerMap::createDirs(const std::string &path)
1700 {
1701         if (!fs::CreateAllDirs(path)) {
1702                 m_dout<<"ServerMap: Failed to create directory "
1703                                 <<"\""<<path<<"\""<<std::endl;
1704                 throw BaseException("ServerMap failed to create directory");
1705         }
1706 }
1707
1708 std::string ServerMap::getSectorDir(v2s16 pos, int layout)
1709 {
1710         char cc[9];
1711         switch(layout)
1712         {
1713                 case 1:
1714                         porting::mt_snprintf(cc, sizeof(cc), "%.4x%.4x",
1715                                 (unsigned int) pos.X & 0xffff,
1716                                 (unsigned int) pos.Y & 0xffff);
1717
1718                         return m_savedir + DIR_DELIM + "sectors" + DIR_DELIM + cc;
1719                 case 2:
1720                         porting::mt_snprintf(cc, sizeof(cc), (std::string("%.3x") + DIR_DELIM + "%.3x").c_str(),
1721                                 (unsigned int) pos.X & 0xfff,
1722                                 (unsigned int) pos.Y & 0xfff);
1723
1724                         return m_savedir + DIR_DELIM + "sectors2" + DIR_DELIM + cc;
1725                 default:
1726                         assert(false);
1727                         return "";
1728         }
1729 }
1730
1731 v2s16 ServerMap::getSectorPos(const std::string &dirname)
1732 {
1733         unsigned int x = 0, y = 0;
1734         int r;
1735         std::string component;
1736         fs::RemoveLastPathComponent(dirname, &component, 1);
1737         if(component.size() == 8)
1738         {
1739                 // Old layout
1740                 r = sscanf(component.c_str(), "%4x%4x", &x, &y);
1741         }
1742         else if(component.size() == 3)
1743         {
1744                 // New layout
1745                 fs::RemoveLastPathComponent(dirname, &component, 2);
1746                 r = sscanf(component.c_str(), (std::string("%3x") + DIR_DELIM + "%3x").c_str(), &x, &y);
1747                 // Sign-extend the 12 bit values up to 16 bits...
1748                 if(x & 0x800) x |= 0xF000;
1749                 if(y & 0x800) y |= 0xF000;
1750         }
1751         else
1752         {
1753                 r = -1;
1754         }
1755
1756         FATAL_ERROR_IF(r != 2, "getSectorPos()");
1757         v2s16 pos((s16)x, (s16)y);
1758         return pos;
1759 }
1760
1761 v3s16 ServerMap::getBlockPos(const std::string &sectordir, const std::string &blockfile)
1762 {
1763         v2s16 p2d = getSectorPos(sectordir);
1764
1765         if(blockfile.size() != 4){
1766                 throw InvalidFilenameException("Invalid block filename");
1767         }
1768         unsigned int y;
1769         int r = sscanf(blockfile.c_str(), "%4x", &y);
1770         if(r != 1)
1771                 throw InvalidFilenameException("Invalid block filename");
1772         return v3s16(p2d.X, y, p2d.Y);
1773 }
1774
1775 std::string ServerMap::getBlockFilename(v3s16 p)
1776 {
1777         char cc[5];
1778         porting::mt_snprintf(cc, sizeof(cc), "%.4x", (unsigned int)p.Y&0xffff);
1779         return cc;
1780 }
1781
1782 void ServerMap::save(ModifiedState save_level)
1783 {
1784         if (!m_map_saving_enabled) {
1785                 warningstream<<"Not saving map, saving disabled."<<std::endl;
1786                 return;
1787         }
1788
1789         if(save_level == MOD_STATE_CLEAN)
1790                 infostream<<"ServerMap: Saving whole map, this can take time."
1791                                 <<std::endl;
1792
1793         if (m_map_metadata_changed || save_level == MOD_STATE_CLEAN) {
1794                 if (settings_mgr.saveMapMeta())
1795                         m_map_metadata_changed = false;
1796         }
1797
1798         // Profile modified reasons
1799         Profiler modprofiler;
1800
1801         u32 block_count = 0;
1802         u32 block_count_all = 0; // Number of blocks in memory
1803
1804         // Don't do anything with sqlite unless something is really saved
1805         bool save_started = false;
1806
1807         for (auto &sector_it : m_sectors) {
1808                 MapSector *sector = sector_it.second;
1809
1810                 MapBlockVect blocks;
1811                 sector->getBlocks(blocks);
1812
1813                 for (MapBlock *block : blocks) {
1814                         block_count_all++;
1815
1816                         if(block->getModified() >= (u32)save_level) {
1817                                 // Lazy beginSave()
1818                                 if(!save_started) {
1819                                         beginSave();
1820                                         save_started = true;
1821                                 }
1822
1823                                 modprofiler.add(block->getModifiedReasonString(), 1);
1824
1825                                 saveBlock(block);
1826                                 block_count++;
1827                         }
1828                 }
1829         }
1830
1831         if(save_started)
1832                 endSave();
1833
1834         /*
1835                 Only print if something happened or saved whole map
1836         */
1837         if(save_level == MOD_STATE_CLEAN
1838                         || block_count != 0) {
1839                 infostream<<"ServerMap: Written: "
1840                                 <<block_count<<" block files"
1841                                 <<", "<<block_count_all<<" blocks in memory."
1842                                 <<std::endl;
1843                 PrintInfo(infostream); // ServerMap/ClientMap:
1844                 infostream<<"Blocks modified by: "<<std::endl;
1845                 modprofiler.print(infostream);
1846         }
1847 }
1848
1849 void ServerMap::listAllLoadableBlocks(std::vector<v3s16> &dst)
1850 {
1851         if (loadFromFolders()) {
1852                 errorstream << "Map::listAllLoadableBlocks(): Result will be missing "
1853                                 << "all blocks that are stored in flat files." << std::endl;
1854         }
1855         dbase->listAllLoadableBlocks(dst);
1856         if (dbase_ro)
1857                 dbase_ro->listAllLoadableBlocks(dst);
1858 }
1859
1860 void ServerMap::listAllLoadedBlocks(std::vector<v3s16> &dst)
1861 {
1862         for (auto &sector_it : m_sectors) {
1863                 MapSector *sector = sector_it.second;
1864
1865                 MapBlockVect blocks;
1866                 sector->getBlocks(blocks);
1867
1868                 for (MapBlock *block : blocks) {
1869                         v3s16 p = block->getPos();
1870                         dst.push_back(p);
1871                 }
1872         }
1873 }
1874
1875 MapDatabase *ServerMap::createDatabase(
1876         const std::string &name,
1877         const std::string &savedir,
1878         Settings &conf)
1879 {
1880         if (name == "sqlite3")
1881                 return new MapDatabaseSQLite3(savedir);
1882         if (name == "dummy")
1883                 return new Database_Dummy();
1884         #if USE_LEVELDB
1885         if (name == "leveldb")
1886                 return new Database_LevelDB(savedir);
1887         #endif
1888         #if USE_REDIS
1889         if (name == "redis")
1890                 return new Database_Redis(conf);
1891         #endif
1892         #if USE_POSTGRESQL
1893         if (name == "postgresql") {
1894                 std::string connect_string;
1895                 conf.getNoEx("pgsql_connection", connect_string);
1896                 return new MapDatabasePostgreSQL(connect_string);
1897         }
1898         #endif
1899
1900         throw BaseException(std::string("Database backend ") + name + " not supported.");
1901 }
1902
1903 void ServerMap::beginSave()
1904 {
1905         dbase->beginSave();
1906 }
1907
1908 void ServerMap::endSave()
1909 {
1910         dbase->endSave();
1911 }
1912
1913 bool ServerMap::saveBlock(MapBlock *block)
1914 {
1915         return saveBlock(block, dbase);
1916 }
1917
1918 bool ServerMap::saveBlock(MapBlock *block, MapDatabase *db)
1919 {
1920         v3s16 p3d = block->getPos();
1921
1922         // Dummy blocks are not written
1923         if (block->isDummy()) {
1924                 warningstream << "saveBlock: Not writing dummy block "
1925                         << PP(p3d) << std::endl;
1926                 return true;
1927         }
1928
1929         // Format used for writing
1930         u8 version = SER_FMT_VER_HIGHEST_WRITE;
1931
1932         /*
1933                 [0] u8 serialization version
1934                 [1] data
1935         */
1936         std::ostringstream o(std::ios_base::binary);
1937         o.write((char*) &version, 1);
1938         block->serialize(o, version, true);
1939
1940         bool ret = db->saveBlock(p3d, o.str());
1941         if (ret) {
1942                 // We just wrote it to the disk so clear modified flag
1943                 block->resetModified();
1944         }
1945         return ret;
1946 }
1947
1948 void ServerMap::loadBlock(const std::string &sectordir, const std::string &blockfile,
1949                 MapSector *sector, bool save_after_load)
1950 {
1951         std::string fullpath = sectordir + DIR_DELIM + blockfile;
1952         try {
1953                 std::ifstream is(fullpath.c_str(), std::ios_base::binary);
1954                 if (!is.good())
1955                         throw FileNotGoodException("Cannot open block file");
1956
1957                 v3s16 p3d = getBlockPos(sectordir, blockfile);
1958                 v2s16 p2d(p3d.X, p3d.Z);
1959
1960                 assert(sector->getPos() == p2d);
1961
1962                 u8 version = SER_FMT_VER_INVALID;
1963                 is.read((char*)&version, 1);
1964
1965                 if(is.fail())
1966                         throw SerializationError("ServerMap::loadBlock(): Failed"
1967                                         " to read MapBlock version");
1968
1969                 /*u32 block_size = MapBlock::serializedLength(version);
1970                 SharedBuffer<u8> data(block_size);
1971                 is.read((char*)*data, block_size);*/
1972
1973                 // This will always return a sector because we're the server
1974                 //MapSector *sector = emergeSector(p2d);
1975
1976                 MapBlock *block = NULL;
1977                 bool created_new = false;
1978                 block = sector->getBlockNoCreateNoEx(p3d.Y);
1979                 if(block == NULL)
1980                 {
1981                         block = sector->createBlankBlockNoInsert(p3d.Y);
1982                         created_new = true;
1983                 }
1984
1985                 // Read basic data
1986                 block->deSerialize(is, version, true);
1987
1988                 // If it's a new block, insert it to the map
1989                 if (created_new) {
1990                         sector->insertBlock(block);
1991                         ReflowScan scanner(this, m_emerge->ndef);
1992                         scanner.scan(block, &m_transforming_liquid);
1993                 }
1994
1995                 /*
1996                         Save blocks loaded in old format in new format
1997                 */
1998
1999                 if(version < SER_FMT_VER_HIGHEST_WRITE || save_after_load)
2000                 {
2001                         saveBlock(block);
2002
2003                         // Should be in database now, so delete the old file
2004                         fs::RecursiveDelete(fullpath);
2005                 }
2006
2007                 // We just loaded it from the disk, so it's up-to-date.
2008                 block->resetModified();
2009
2010         }
2011         catch(SerializationError &e)
2012         {
2013                 warningstream<<"Invalid block data on disk "
2014                                 <<"fullpath="<<fullpath
2015                                 <<" (SerializationError). "
2016                                 <<"what()="<<e.what()
2017                                 <<std::endl;
2018                                 // Ignoring. A new one will be generated.
2019                 abort();
2020
2021                 // TODO: Backup file; name is in fullpath.
2022         }
2023 }
2024
2025 void ServerMap::loadBlock(std::string *blob, v3s16 p3d, MapSector *sector, bool save_after_load)
2026 {
2027         try {
2028                 std::istringstream is(*blob, std::ios_base::binary);
2029
2030                 u8 version = SER_FMT_VER_INVALID;
2031                 is.read((char*)&version, 1);
2032
2033                 if(is.fail())
2034                         throw SerializationError("ServerMap::loadBlock(): Failed"
2035                                         " to read MapBlock version");
2036
2037                 MapBlock *block = NULL;
2038                 bool created_new = false;
2039                 block = sector->getBlockNoCreateNoEx(p3d.Y);
2040                 if(block == NULL)
2041                 {
2042                         block = sector->createBlankBlockNoInsert(p3d.Y);
2043                         created_new = true;
2044                 }
2045
2046                 // Read basic data
2047                 block->deSerialize(is, version, true);
2048
2049                 // If it's a new block, insert it to the map
2050                 if (created_new) {
2051                         sector->insertBlock(block);
2052                         ReflowScan scanner(this, m_emerge->ndef);
2053                         scanner.scan(block, &m_transforming_liquid);
2054                 }
2055
2056                 /*
2057                         Save blocks loaded in old format in new format
2058                 */
2059
2060                 //if(version < SER_FMT_VER_HIGHEST_READ || save_after_load)
2061                 // Only save if asked to; no need to update version
2062                 if(save_after_load)
2063                         saveBlock(block);
2064
2065                 // We just loaded it from, so it's up-to-date.
2066                 block->resetModified();
2067         }
2068         catch(SerializationError &e)
2069         {
2070                 errorstream<<"Invalid block data in database"
2071                                 <<" ("<<p3d.X<<","<<p3d.Y<<","<<p3d.Z<<")"
2072                                 <<" (SerializationError): "<<e.what()<<std::endl;
2073
2074                 // TODO: Block should be marked as invalid in memory so that it is
2075                 // not touched but the game can run
2076
2077                 if(g_settings->getBool("ignore_world_load_errors")){
2078                         errorstream<<"Ignoring block load error. Duck and cover! "
2079                                         <<"(ignore_world_load_errors)"<<std::endl;
2080                 } else {
2081                         throw SerializationError("Invalid block data in database");
2082                 }
2083         }
2084 }
2085
2086 MapBlock* ServerMap::loadBlock(v3s16 blockpos)
2087 {
2088         bool created_new = (getBlockNoCreateNoEx(blockpos) == NULL);
2089
2090         v2s16 p2d(blockpos.X, blockpos.Z);
2091
2092         std::string ret;
2093         dbase->loadBlock(blockpos, &ret);
2094         if (!ret.empty()) {
2095                 loadBlock(&ret, blockpos, createSector(p2d), false);
2096         } else if (dbase_ro) {
2097                 dbase_ro->loadBlock(blockpos, &ret);
2098                 if (!ret.empty()) {
2099                         loadBlock(&ret, blockpos, createSector(p2d), false);
2100                 }
2101         } else {
2102                 // Not found in database, try the files
2103
2104                 // The directory layout we're going to load from.
2105                 //  1 - original sectors/xxxxzzzz/
2106                 //  2 - new sectors2/xxx/zzz/
2107                 //  If we load from anything but the latest structure, we will
2108                 //  immediately save to the new one, and remove the old.
2109                 std::string sectordir1 = getSectorDir(p2d, 1);
2110                 std::string sectordir;
2111                 if (fs::PathExists(sectordir1)) {
2112                         sectordir = sectordir1;
2113                 } else {
2114                         sectordir = getSectorDir(p2d, 2);
2115                 }
2116
2117                 /*
2118                 Make sure sector is loaded
2119                  */
2120
2121                 MapSector *sector = getSectorNoGenerate(p2d);
2122
2123                 /*
2124                 Make sure file exists
2125                  */
2126
2127                 std::string blockfilename = getBlockFilename(blockpos);
2128                 if (!fs::PathExists(sectordir + DIR_DELIM + blockfilename))
2129                         return NULL;
2130
2131                 /*
2132                 Load block and save it to the database
2133                  */
2134                 loadBlock(sectordir, blockfilename, sector, true);
2135         }
2136
2137         MapBlock *block = getBlockNoCreateNoEx(blockpos);
2138         if (created_new && (block != NULL)) {
2139                 std::map<v3s16, MapBlock*> modified_blocks;
2140                 // Fix lighting if necessary
2141                 voxalgo::update_block_border_lighting(this, block, modified_blocks);
2142                 if (!modified_blocks.empty()) {
2143                         //Modified lighting, send event
2144                         MapEditEvent event;
2145                         event.type = MEET_OTHER;
2146                         std::map<v3s16, MapBlock *>::iterator it;
2147                         for (it = modified_blocks.begin();
2148                                         it != modified_blocks.end(); ++it)
2149                                 event.modified_blocks.insert(it->first);
2150                         dispatchEvent(&event);
2151                 }
2152         }
2153         return block;
2154 }
2155
2156 bool ServerMap::deleteBlock(v3s16 blockpos)
2157 {
2158         if (!dbase->deleteBlock(blockpos))
2159                 return false;
2160
2161         MapBlock *block = getBlockNoCreateNoEx(blockpos);
2162         if (block) {
2163                 v2s16 p2d(blockpos.X, blockpos.Z);
2164                 MapSector *sector = getSectorNoGenerate(p2d);
2165                 if (!sector)
2166                         return false;
2167                 sector->deleteBlock(block);
2168         }
2169
2170         return true;
2171 }
2172
2173 void ServerMap::PrintInfo(std::ostream &out)
2174 {
2175         out<<"ServerMap: ";
2176 }
2177
2178 bool ServerMap::repairBlockLight(v3s16 blockpos,
2179         std::map<v3s16, MapBlock *> *modified_blocks)
2180 {
2181         MapBlock *block = emergeBlock(blockpos, false);
2182         if (!block || !block->isGenerated())
2183                 return false;
2184         voxalgo::repair_block_light(this, block, modified_blocks);
2185         return true;
2186 }
2187
2188 MMVManip::MMVManip(Map *map):
2189                 VoxelManipulator(),
2190                 m_map(map)
2191 {
2192 }
2193
2194 void MMVManip::initialEmerge(v3s16 blockpos_min, v3s16 blockpos_max,
2195         bool load_if_inexistent)
2196 {
2197         TimeTaker timer1("initialEmerge", &emerge_time);
2198
2199         // Units of these are MapBlocks
2200         v3s16 p_min = blockpos_min;
2201         v3s16 p_max = blockpos_max;
2202
2203         VoxelArea block_area_nodes
2204                         (p_min*MAP_BLOCKSIZE, (p_max+1)*MAP_BLOCKSIZE-v3s16(1,1,1));
2205
2206         u32 size_MB = block_area_nodes.getVolume()*4/1000000;
2207         if(size_MB >= 1)
2208         {
2209                 infostream<<"initialEmerge: area: ";
2210                 block_area_nodes.print(infostream);
2211                 infostream<<" ("<<size_MB<<"MB)";
2212                 infostream<<std::endl;
2213         }
2214
2215         addArea(block_area_nodes);
2216
2217         for(s32 z=p_min.Z; z<=p_max.Z; z++)
2218         for(s32 y=p_min.Y; y<=p_max.Y; y++)
2219         for(s32 x=p_min.X; x<=p_max.X; x++)
2220         {
2221                 u8 flags = 0;
2222                 MapBlock *block;
2223                 v3s16 p(x,y,z);
2224                 std::map<v3s16, u8>::iterator n;
2225                 n = m_loaded_blocks.find(p);
2226                 if(n != m_loaded_blocks.end())
2227                         continue;
2228
2229                 bool block_data_inexistent = false;
2230                 {
2231                         TimeTaker timer2("emerge load", &emerge_load_time);
2232
2233                         block = m_map->getBlockNoCreateNoEx(p);
2234                         if (!block || block->isDummy())
2235                                 block_data_inexistent = true;
2236                         else
2237                                 block->copyTo(*this);
2238                 }
2239
2240                 if(block_data_inexistent)
2241                 {
2242
2243                         if (load_if_inexistent && !blockpos_over_max_limit(p)) {
2244                                 ServerMap *svrmap = (ServerMap *)m_map;
2245                                 block = svrmap->emergeBlock(p, false);
2246                                 if (block == NULL)
2247                                         block = svrmap->createBlock(p);
2248                                 block->copyTo(*this);
2249                         } else {
2250                                 flags |= VMANIP_BLOCK_DATA_INEXIST;
2251
2252                                 /*
2253                                         Mark area inexistent
2254                                 */
2255                                 VoxelArea a(p*MAP_BLOCKSIZE, (p+1)*MAP_BLOCKSIZE-v3s16(1,1,1));
2256                                 // Fill with VOXELFLAG_NO_DATA
2257                                 for(s32 z=a.MinEdge.Z; z<=a.MaxEdge.Z; z++)
2258                                 for(s32 y=a.MinEdge.Y; y<=a.MaxEdge.Y; y++)
2259                                 {
2260                                         s32 i = m_area.index(a.MinEdge.X,y,z);
2261                                         memset(&m_flags[i], VOXELFLAG_NO_DATA, MAP_BLOCKSIZE);
2262                                 }
2263                         }
2264                 }
2265                 /*else if (block->getNode(0, 0, 0).getContent() == CONTENT_IGNORE)
2266                 {
2267                         // Mark that block was loaded as blank
2268                         flags |= VMANIP_BLOCK_CONTAINS_CIGNORE;
2269                 }*/
2270
2271                 m_loaded_blocks[p] = flags;
2272         }
2273
2274         m_is_dirty = false;
2275 }
2276
2277 void MMVManip::blitBackAll(std::map<v3s16, MapBlock*> *modified_blocks,
2278         bool overwrite_generated)
2279 {
2280         if(m_area.getExtent() == v3s16(0,0,0))
2281                 return;
2282
2283         /*
2284                 Copy data of all blocks
2285         */
2286         for (auto &loaded_block : m_loaded_blocks) {
2287                 v3s16 p = loaded_block.first;
2288                 MapBlock *block = m_map->getBlockNoCreateNoEx(p);
2289                 bool existed = !(loaded_block.second & VMANIP_BLOCK_DATA_INEXIST);
2290                 if (!existed || (block == NULL) ||
2291                         (!overwrite_generated && block->isGenerated()))
2292                         continue;
2293
2294                 block->copyFrom(*this);
2295                 block->raiseModified(MOD_STATE_WRITE_NEEDED, MOD_REASON_VMANIP);
2296
2297                 if(modified_blocks)
2298                         (*modified_blocks)[p] = block;
2299         }
2300 }
2301
2302 //END