src/database-dummy.cpp

   1 /*
   2 Minetest
   3 Copyright (C) 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 /*
  21 Dummy "database" class
  22 */
  23
  24
  25 #include "database-dummy.h"
  26
  27 #include "map.h"
  28 #include "mapsector.h"
  29 #include "mapblock.h"
  30 #include "serialization.h"
  31 #include "main.h"
  32 #include "settings.h"
  33 #include "log.h"
  34
  35 Database_Dummy::Database_Dummy(ServerMap *map)
  36 {
  37         srvmap = map;
  38 }
  39
  40 int Database_Dummy::Initialized(void)
  41 {
  42         return 1;
  43 }
  44
  45 void Database_Dummy::beginSave() {}
  46 void Database_Dummy::endSave() {}
  47
  48 void Database_Dummy::saveBlock(MapBlock *block)
  49 {
  50         DSTACK(__FUNCTION_NAME);
  51         /*
  52                 Dummy blocks are not written
  53         */
  54         if(block->isDummy())
  55         {
  56                 return;
  57         }
  58
  59         // Format used for writing
  60         u8 version = SER_FMT_VER_HIGHEST_WRITE;
  61         // Get destination
  62         v3s16 p3d = block->getPos();
  63
  64         /*
  65                 [0] u8 serialization version
  66                 [1] data
  67         */
  68
  69         std::ostringstream o(std::ios_base::binary);
  70         o.write((char*)&version, 1);
  71         // Write basic data
  72         block->serialize(o, version, true);
  73         // Write block to database
  74         std::string tmp = o.str();
  75
  76         m_database[getBlockAsInteger(p3d)] = tmp;
  77         // We just wrote it to the disk so clear modified flag
  78         block->resetModified();
  79 }
  80
  81 MapBlock* Database_Dummy::loadBlock(v3s16 blockpos)
  82 {
  83         v2s16 p2d(blockpos.X, blockpos.Z);
  84
  85         if(m_database.count(getBlockAsInteger(blockpos))) {
  86                 /*
  87                         Make sure sector is loaded
  88                 */
  89                 MapSector *sector = srvmap->createSector(p2d);
  90                 /*
  91                         Load block
  92                 */
  93                 std::string datastr = m_database[getBlockAsInteger(blockpos)];
  94 //                srvmap->loadBlock(&datastr, blockpos, sector, false);
  95
  96                 try {
  97                         std::istringstream is(datastr, std::ios_base::binary);
  98                         u8 version = SER_FMT_VER_INVALID;
  99                         is.read((char*)&version, 1);
 100
 101                         if(is.fail())
 102                                 throw SerializationError("ServerMap::loadBlock(): Failed"
 103                                                      " to read MapBlock version");
 104
 105                         MapBlock *block = NULL;
 106                         bool created_new = false;
 107                         block = sector->getBlockNoCreateNoEx(blockpos.Y);
 108                         if(block == NULL)
 109                         {
 110                                 block = sector->createBlankBlockNoInsert(blockpos.Y);
 111                                 created_new = true;
 112                         }
 113                         // Read basic data
 114                         block->deSerialize(is, version, true);
 115                         // If it's a new block, insert it to the map
 116                         if(created_new)
 117                                 sector->insertBlock(block);
 118                         /*
 119                                 Save blocks loaded in old format in new format
 120                         */
 121
 122                         //if(version < SER_FMT_VER_HIGHEST || save_after_load)
 123                         // Only save if asked to; no need to update version
 124                         //if(save_after_load)
 125                         //      saveBlock(block);
 126                         // We just loaded it from, so it's up-to-date.
 127                         block->resetModified();
 128
 129                 }
 130                 catch(SerializationError &e)
 131                 {
 132                         errorstream<<"Invalid block data in database"
 133                                      <<" ("<<blockpos.X<<","<<blockpos.Y<<","<<blockpos.Z<<")"
 134                                      <<" (SerializationError): "<<e.what()<<std::endl;
 135                      // TODO: Block should be marked as invalid in memory so that it is
 136                      // not touched but the game can run
 137
 138                         if(g_settings->getBool("ignore_world_load_errors")){
 139                              errorstream<<"Ignoring block load error. Duck and cover! "
 140                                              <<"(ignore_world_load_errors)"<<std::endl;
 141                         } else {
 142                              throw SerializationError("Invalid block data in database");
 143                              //assert(0);
 144                         }
 145                 }
 146
 147                 return srvmap->getBlockNoCreateNoEx(blockpos);  // should not be using this here
 148         }
 149         return(NULL);
 150 }
 151
 152 void Database_Dummy::listAllLoadableBlocks(std::list<v3s16> &dst)
 153 {
 154         for(std::map<u64, std::string>::iterator x = m_database.begin(); x != m_database.end(); ++x)
 155         {
 156                 v3s16 p = getIntegerAsBlock(x->first);
 157                 //dstream<<"block_i="<<block_i<<" p="<<PP(p)<<std::endl;
 158                 dst.push_back(p);
 159         }
 160 }
 161
 162 Database_Dummy::~Database_Dummy()
 163 {
 164         m_database.clear();
 165 }