forked from Mirrorlandia_minetest/minetest
239 lines
7.1 KiB
C++
239 lines
7.1 KiB
C++
/*
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Minetest
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Copyright (C) 2013 celeron55, Perttu Ahola <celeron55@gmail.com>
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License along
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with this program; if not, write to the Free Software Foundation, Inc.,
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51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include "rollback_interface.h"
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#include <sstream>
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#include "util/serialize.h"
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#include "util/string.h"
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#include "util/numeric.h"
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#include "util/basic_macros.h"
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#include "map.h"
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#include "gamedef.h"
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#include "nodedef.h"
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#include "nodemetadata.h"
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#include "exceptions.h"
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#include "log.h"
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#include "inventorymanager.h"
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#include "inventory.h"
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#include "mapblock.h"
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RollbackNode::RollbackNode(Map *map, v3s16 p, IGameDef *gamedef)
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{
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INodeDefManager *ndef = gamedef->ndef();
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MapNode n = map->getNodeNoEx(p);
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name = ndef->get(n).name;
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param1 = n.param1;
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param2 = n.param2;
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NodeMetadata *metap = map->getNodeMetadata(p);
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if (metap) {
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std::ostringstream os(std::ios::binary);
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metap->serialize(os, 1); // FIXME: version bump??
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meta = os.str();
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}
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}
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std::string RollbackAction::toString() const
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{
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std::ostringstream os(std::ios::binary);
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switch (type) {
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case TYPE_SET_NODE:
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os << "set_node " << PP(p);
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os << ": (" << serializeJsonString(n_old.name);
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os << ", " << itos(n_old.param1);
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os << ", " << itos(n_old.param2);
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os << ", " << serializeJsonString(n_old.meta);
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os << ") -> (" << serializeJsonString(n_new.name);
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os << ", " << itos(n_new.param1);
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os << ", " << itos(n_new.param2);
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os << ", " << serializeJsonString(n_new.meta);
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os << ')';
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case TYPE_MODIFY_INVENTORY_STACK:
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os << "modify_inventory_stack (";
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os << serializeJsonString(inventory_location);
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os << ", " << serializeJsonString(inventory_list);
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os << ", " << inventory_index;
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os << ", " << (inventory_add ? "add" : "remove");
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os << ", " << serializeJsonString(inventory_stack.getItemString());
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os << ')';
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default:
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return "<unknown action>";
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}
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return os.str();
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}
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bool RollbackAction::isImportant(IGameDef *gamedef) const
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{
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if (type != TYPE_SET_NODE)
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return true;
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// If names differ, action is always important
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if(n_old.name != n_new.name)
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return true;
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// If metadata differs, action is always important
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if(n_old.meta != n_new.meta)
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return true;
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INodeDefManager *ndef = gamedef->ndef();
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// Both are of the same name, so a single definition is needed
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const ContentFeatures &def = ndef->get(n_old.name);
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// If the type is flowing liquid, action is not important
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if (def.liquid_type == LIQUID_FLOWING)
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return false;
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// Otherwise action is important
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return true;
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}
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bool RollbackAction::getPosition(v3s16 *dst) const
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{
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switch (type) {
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case TYPE_SET_NODE:
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if (dst) *dst = p;
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return true;
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case TYPE_MODIFY_INVENTORY_STACK: {
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InventoryLocation loc;
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loc.deSerialize(inventory_location);
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if (loc.type != InventoryLocation::NODEMETA) {
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return false;
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}
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if (dst) *dst = loc.p;
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return true; }
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default:
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return false;
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}
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}
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bool RollbackAction::applyRevert(Map *map, InventoryManager *imgr, IGameDef *gamedef) const
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{
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try {
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switch (type) {
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case TYPE_NOTHING:
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return true;
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case TYPE_SET_NODE: {
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INodeDefManager *ndef = gamedef->ndef();
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// Make sure position is loaded from disk
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map->emergeBlock(getContainerPos(p, MAP_BLOCKSIZE), false);
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// Check current node
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MapNode current_node = map->getNodeNoEx(p);
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std::string current_name = ndef->get(current_node).name;
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// If current node not the new node, it's bad
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if (current_name != n_new.name) {
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return false;
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}
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// Create rollback node
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MapNode n(ndef, n_old.name, n_old.param1, n_old.param2);
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// Set rollback node
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try {
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if (!map->addNodeWithEvent(p, n)) {
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infostream << "RollbackAction::applyRevert(): "
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<< "AddNodeWithEvent failed at "
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<< PP(p) << " for " << n_old.name
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<< std::endl;
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return false;
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}
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if (n_old.meta.empty()) {
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map->removeNodeMetadata(p);
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} else {
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NodeMetadata *meta = map->getNodeMetadata(p);
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if (!meta) {
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meta = new NodeMetadata(gamedef->idef());
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if (!map->setNodeMetadata(p, meta)) {
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delete meta;
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infostream << "RollbackAction::applyRevert(): "
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<< "setNodeMetadata failed at "
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<< PP(p) << " for " << n_old.name
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<< std::endl;
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return false;
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}
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}
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std::istringstream is(n_old.meta, std::ios::binary);
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meta->deSerialize(is, 1); // FIXME: version bump??
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}
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// Inform other things that the meta data has changed
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v3s16 blockpos = getContainerPos(p, MAP_BLOCKSIZE);
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MapEditEvent event;
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event.type = MEET_BLOCK_NODE_METADATA_CHANGED;
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event.p = blockpos;
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map->dispatchEvent(&event);
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// Set the block to be saved
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MapBlock *block = map->getBlockNoCreateNoEx(blockpos);
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if (block) {
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block->raiseModified(MOD_STATE_WRITE_NEEDED,
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MOD_REASON_REPORT_META_CHANGE);
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}
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} catch (InvalidPositionException &e) {
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infostream << "RollbackAction::applyRevert(): "
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<< "InvalidPositionException: " << e.what()
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<< std::endl;
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return false;
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}
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// Success
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return true; }
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case TYPE_MODIFY_INVENTORY_STACK: {
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InventoryLocation loc;
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loc.deSerialize(inventory_location);
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Inventory *inv = imgr->getInventory(loc);
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if (!inv) {
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infostream << "RollbackAction::applyRevert(): Could not get "
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"inventory at " << inventory_location << std::endl;
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return false;
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}
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InventoryList *list = inv->getList(inventory_list);
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if (!list) {
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infostream << "RollbackAction::applyRevert(): Could not get "
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"inventory list \"" << inventory_list << "\" in "
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<< inventory_location << std::endl;
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return false;
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}
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if (list->getSize() <= inventory_index) {
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infostream << "RollbackAction::applyRevert(): List index "
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<< inventory_index << " too large in "
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<< "inventory list \"" << inventory_list << "\" in "
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<< inventory_location << std::endl;
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return false;
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}
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// If item was added, take away item, otherwise add removed item
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if (inventory_add) {
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// Silently ignore different current item
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if (list->getItem(inventory_index).name !=
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gamedef->idef()->getAlias(inventory_stack.name))
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return false;
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list->takeItem(inventory_index, inventory_stack.count);
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} else {
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list->addItem(inventory_index, inventory_stack);
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}
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// Inventory was modified; send to clients
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imgr->setInventoryModified(loc);
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return true; }
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default:
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errorstream << "RollbackAction::applyRevert(): type not handled"
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<< std::endl;
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return false;
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}
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} catch(SerializationError &e) {
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errorstream << "RollbackAction::applyRevert(): n_old.name=" << n_old.name
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<< ", SerializationError: " << e.what() << std::endl;
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}
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return false;
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}
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