minetest/src/rollback_interface.cpp

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/*
Minetest-c55
Copyright (C) 2012 celeron55, Perttu Ahola <celeron55@gmail.com>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License along
with this program; if not, write to the Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "rollback_interface.h"
#include <sstream>
#include "util/serialize.h"
#include "util/string.h"
#include "util/numeric.h"
#include "map.h"
#include "gamedef.h"
#include "nodedef.h"
#include "nodemetadata.h"
#include "exceptions.h"
#include "log.h"
#include "inventorymanager.h"
#include "inventory.h"
#include "mapblock.h"
#define PP(x) "("<<(x).X<<","<<(x).Y<<","<<(x).Z<<")"
RollbackNode::RollbackNode(Map *map, v3s16 p, IGameDef *gamedef)
{
INodeDefManager *ndef = gamedef->ndef();
MapNode n = map->getNodeNoEx(p);
name = ndef->get(n).name;
param1 = n.param1;
param2 = n.param2;
NodeMetadata *metap = map->getNodeMetadata(p);
if(metap){
std::ostringstream os(std::ios::binary);
metap->serialize(os);
meta = os.str();
}
}
std::string RollbackAction::toString() const
{
switch(type){
case TYPE_SET_NODE: {
std::ostringstream os(std::ios::binary);
os<<"[set_node";
os<<" ";
os<<"("<<itos(p.X)<<","<<itos(p.Y)<<","<<itos(p.Z)<<")";
os<<" ";
os<<serializeJsonString(n_old.name);
os<<" ";
os<<itos(n_old.param1);
os<<" ";
os<<itos(n_old.param2);
os<<" ";
os<<serializeJsonString(n_old.meta);
os<<" ";
os<<serializeJsonString(n_new.name);
os<<" ";
os<<itos(n_new.param1);
os<<" ";
os<<itos(n_new.param2);
os<<" ";
os<<serializeJsonString(n_new.meta);
os<<"]";
return os.str(); }
case TYPE_MODIFY_INVENTORY_STACK: {
std::ostringstream os(std::ios::binary);
os<<"[modify_inventory_stack";
os<<" ";
os<<serializeJsonString(inventory_location);
os<<" ";
os<<serializeJsonString(inventory_list);
os<<" ";
os<<inventory_index;
os<<" ";
os<<(inventory_add?"add":"remove");
os<<" ";
os<<serializeJsonString(inventory_stack);
os<<"]";
return os.str(); }
default:
return "none";
}
}
void RollbackAction::fromStream(std::istream &is) throw(SerializationError)
{
int c = is.get();
if(c != '['){
is.putback(c);
throw SerializationError("RollbackAction: starting [ not found");
}
std::string id;
std::getline(is, id, ' ');
if(id == "set_node")
{
c = is.get();
if(c != '('){
is.putback(c);
throw SerializationError("RollbackAction: starting ( not found");
}
// Position
std::string px_raw;
std::string py_raw;
std::string pz_raw;
std::getline(is, px_raw, ',');
std::getline(is, py_raw, ',');
std::getline(is, pz_raw, ')');
c = is.get();
if(c != ' '){
is.putback(c);
throw SerializationError("RollbackAction: after-p ' ' not found");
}
v3s16 loaded_p(stoi(px_raw), stoi(py_raw), stoi(pz_raw));
// Old node
std::string old_name;
try{
old_name = deSerializeJsonString(is);
}catch(SerializationError &e){
errorstream<<"Serialization error in RollbackAction::fromStream(): "
<<"old_name: "<<e.what()<<std::endl;
throw e;
}
c = is.get();
if(c != ' '){
is.putback(c);
throw SerializationError("RollbackAction: after-old_name ' ' not found");
}
std::string old_p1_raw;
std::string old_p2_raw;
std::getline(is, old_p1_raw, ' ');
std::getline(is, old_p2_raw, ' ');
int old_p1 = stoi(old_p1_raw);
int old_p2 = stoi(old_p2_raw);
std::string old_meta;
try{
old_meta = deSerializeJsonString(is);
}catch(SerializationError &e){
errorstream<<"Serialization error in RollbackAction::fromStream(): "
<<"old_meta: "<<e.what()<<std::endl;
throw e;
}
c = is.get();
if(c != ' '){
is.putback(c);
throw SerializationError("RollbackAction: after-old_meta ' ' not found");
}
// New node
std::string new_name;
try{
new_name = deSerializeJsonString(is);
}catch(SerializationError &e){
errorstream<<"Serialization error in RollbackAction::fromStream(): "
<<"new_name: "<<e.what()<<std::endl;
throw e;
}
c = is.get();
if(c != ' '){
is.putback(c);
throw SerializationError("RollbackAction: after-new_name ' ' not found");
}
std::string new_p1_raw;
std::string new_p2_raw;
std::getline(is, new_p1_raw, ' ');
std::getline(is, new_p2_raw, ' ');
int new_p1 = stoi(new_p1_raw);
int new_p2 = stoi(new_p2_raw);
std::string new_meta;
try{
new_meta = deSerializeJsonString(is);
}catch(SerializationError &e){
errorstream<<"Serialization error in RollbackAction::fromStream(): "
<<"new_meta: "<<e.what()<<std::endl;
throw e;
}
c = is.get();
if(c != ']'){
is.putback(c);
throw SerializationError("RollbackAction: after-new_meta ] not found");
}
// Set values
type = TYPE_SET_NODE;
p = loaded_p;
n_old.name = old_name;
n_old.param1 = old_p1;
n_old.param2 = old_p2;
n_old.meta = old_meta;
n_new.name = new_name;
n_new.param1 = new_p1;
n_new.param2 = new_p2;
n_new.meta = new_meta;
}
else if(id == "modify_inventory_stack")
{
// Location
std::string location;
try{
location = deSerializeJsonString(is);
}catch(SerializationError &e){
errorstream<<"Serialization error in RollbackAction::fromStream(): "
<<"location: "<<e.what()<<std::endl;
throw e;
}
c = is.get();
if(c != ' '){
is.putback(c);
throw SerializationError("RollbackAction: after-loc ' ' not found");
}
// List
std::string listname;
try{
listname = deSerializeJsonString(is);
}catch(SerializationError &e){
errorstream<<"Serialization error in RollbackAction::fromStream(): "
<<"listname: "<<e.what()<<std::endl;
throw e;
}
c = is.get();
if(c != ' '){
is.putback(c);
throw SerializationError("RollbackAction: after-list ' ' not found");
}
// Index
std::string index_raw;
std::getline(is, index_raw, ' ');
// add/remove
std::string addremove;
std::getline(is, addremove, ' ');
if(addremove != "add" && addremove != "remove"){
throw SerializationError("RollbackAction: addremove is not add or remove");
}
// Itemstring
std::string stack;
try{
stack = deSerializeJsonString(is);
}catch(SerializationError &e){
errorstream<<"Serialization error in RollbackAction::fromStream(): "
<<"stack: "<<e.what()<<std::endl;
throw e;
}
// Set values
type = TYPE_MODIFY_INVENTORY_STACK;
inventory_location = location;
inventory_list = listname;
inventory_index = stoi(index_raw);
inventory_add = (addremove == "add");
inventory_stack = stack;
}
else
{
throw SerializationError("RollbackAction: Unknown id");
}
}
bool RollbackAction::isImportant(IGameDef *gamedef) const
{
switch(type){
case TYPE_SET_NODE: {
// If names differ, action is always important
if(n_old.name != n_new.name)
return true;
// If metadata differs, action is always important
if(n_old.meta != n_new.meta)
return true;
INodeDefManager *ndef = gamedef->ndef();
// Both are of the same name, so a single definition is needed
const ContentFeatures &def = ndef->get(n_old.name);
// If the type is flowing liquid, action is not important
if(def.liquid_type == LIQUID_FLOWING)
return false;
// Otherwise action is important
return true; }
default:
return true;
}
}
bool RollbackAction::getPosition(v3s16 *dst) const
{
switch(type){
case RollbackAction::TYPE_SET_NODE:
if(dst) *dst = p;
return true;
case RollbackAction::TYPE_MODIFY_INVENTORY_STACK: {
InventoryLocation loc;
loc.deSerialize(inventory_location);
if(loc.type != InventoryLocation::NODEMETA)
return false;
if(dst) *dst = loc.p;
return true; }
default:
return false;
}
}
bool RollbackAction::applyRevert(Map *map, InventoryManager *imgr, IGameDef *gamedef) const
{
try{
switch(type){
case TYPE_NOTHING:
return true;
case TYPE_SET_NODE: {
INodeDefManager *ndef = gamedef->ndef();
// Make sure position is loaded from disk
map->emergeBlock(getContainerPos(p, MAP_BLOCKSIZE), false);
// Check current node
MapNode current_node = map->getNodeNoEx(p);
std::string current_name = ndef->get(current_node).name;
// If current node not the new node, it's bad
if(current_name != n_new.name)
return false;
/*// If current node not the new node and not ignore, it's bad
if(current_name != n_new.name && current_name != "ignore")
return false;*/
// Create rollback node
MapNode n(ndef, n_old.name, n_old.param1, n_old.param2);
// Set rollback node
try{
if(!map->addNodeWithEvent(p, n)){
infostream<<"RollbackAction::applyRevert(): "
<<"AddNodeWithEvent failed at "
<<PP(p)<<" for "<<n_old.name<<std::endl;
return false;
}
NodeMetadata *meta = map->getNodeMetadata(p);
if(n_old.meta != ""){
if(!meta){
meta = new NodeMetadata(gamedef);
map->setNodeMetadata(p, meta);
}
std::istringstream is(n_old.meta, std::ios::binary);
meta->deSerialize(is);
} else {
map->removeNodeMetadata(p);
}
// NOTE: This same code is in scriptapi.cpp
// Inform other things that the metadata has changed
v3s16 blockpos = getContainerPos(p, MAP_BLOCKSIZE);
MapEditEvent event;
event.type = MEET_BLOCK_NODE_METADATA_CHANGED;
event.p = blockpos;
map->dispatchEvent(&event);
// Set the block to be saved
MapBlock *block = map->getBlockNoCreateNoEx(blockpos);
if(block)
block->raiseModified(MOD_STATE_WRITE_NEEDED,
"NodeMetaRef::reportMetadataChange");
}catch(InvalidPositionException &e){
infostream<<"RollbackAction::applyRevert(): "
<<"InvalidPositionException: "<<e.what()<<std::endl;
return false;
}
// Success
return true; }
case TYPE_MODIFY_INVENTORY_STACK: {
InventoryLocation loc;
loc.deSerialize(inventory_location);
ItemStack stack;
stack.deSerialize(inventory_stack, gamedef->idef());
Inventory *inv = imgr->getInventory(loc);
if(!inv){
infostream<<"RollbackAction::applyRevert(): Could not get "
"inventory at "<<inventory_location<<std::endl;
return false;
}
InventoryList *list = inv->getList(inventory_list);
if(!list){
infostream<<"RollbackAction::applyRevert(): Could not get "
"inventory list \""<<inventory_list<<"\" in "
<<inventory_location<<std::endl;
return false;
}
if(list->getSize() <= inventory_index){
infostream<<"RollbackAction::applyRevert(): List index "
<<inventory_index<<" too large in "
<<"inventory list \""<<inventory_list<<"\" in "
<<inventory_location<<std::endl;
}
// If item was added, take away item, otherwise add removed item
if(inventory_add){
// Silently ignore different current item
if(list->getItem(inventory_index).name != stack.name)
return false;
list->takeItem(inventory_index, stack.count);
} else {
list->addItem(inventory_index, stack);
}
// Inventory was modified; send to clients
imgr->setInventoryModified(loc);
return true; }
default:
errorstream<<"RollbackAction::applyRevert(): type not handled"
<<std::endl;
return false;
}
}catch(SerializationError &e){
errorstream<<"RollbackAction::applyRevert(): n_old.name="<<n_old.name
<<", SerializationError: "<<e.what()<<std::endl;
}
return false;
}