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-rw-r--r--builtin/chatcommands.lua72
-rw-r--r--builtin/privileges.lua2
-rw-r--r--doc/lua_api.txt8
-rw-r--r--src/CMakeLists.txt2
-rw-r--r--src/content_abm.cpp1
-rw-r--r--src/content_cao.cpp1
-rw-r--r--src/content_cso.cpp1
-rw-r--r--src/environment.cpp11
-rw-r--r--src/environment.h11
-rw-r--r--src/gamedef.h6
-rw-r--r--src/inventorymanager.cpp73
-rw-r--r--src/map.cpp87
-rw-r--r--src/map.h5
-rw-r--r--src/rollback.cpp293
-rw-r--r--src/rollback.h51
-rw-r--r--src/rollback_interface.cpp398
-rw-r--r--src/rollback_interface.h145
-rw-r--r--src/scriptapi.cpp53
-rw-r--r--src/server.cpp108
-rw-r--r--src/server.h15
20 files changed, 1316 insertions, 27 deletions
diff --git a/builtin/chatcommands.lua b/builtin/chatcommands.lua
index da9e6c78c..49ae8c633 100644
--- a/builtin/chatcommands.lua
+++ b/builtin/chatcommands.lua
@@ -496,3 +496,75 @@ minetest.register_chatcommand("pulverize", {
end,
})
+-- Key = player name
+minetest.rollback_punch_callbacks = {}
+
+minetest.register_on_punchnode(function(pos, node, puncher)
+ local name = puncher:get_player_name()
+ if minetest.rollback_punch_callbacks[name] then
+ minetest.rollback_punch_callbacks[name](pos, node, puncher)
+ minetest.rollback_punch_callbacks[name] = nil
+ end
+end)
+
+minetest.register_chatcommand("rollback_check", {
+ params = "[<range>] [<seconds>]",
+ description = "check who has last touched a node or near it, "..
+ "max. <seconds> ago (default range=0, seconds=86400=24h)",
+ privs = {rollback=true},
+ func = function(name, param)
+ local range, seconds = string.match(param, "(%d+) *(%d*)")
+ range = tonumber(range) or 0
+ seconds = tonumber(seconds) or 86400
+ minetest.chat_send_player(name, "Punch a node (limits set: range="..
+ dump(range).." seconds="..dump(seconds).."s)")
+ minetest.rollback_punch_callbacks[name] = function(pos, node, puncher)
+ local name = puncher:get_player_name()
+ local actor, act_p, act_seconds =
+ minetest.rollback_get_last_node_actor(pos, range, seconds)
+ if actor == "" then
+ minetest.chat_send_player(name, "Nobody has touched the "..
+ "specified location in "..dump(seconds).." seconds")
+ return
+ end
+ local nodedesc = "this node"
+ if act_p.x ~= pos.x or act_p.y ~= pos.y or act_p.z ~= pos.z then
+ nodedesc = minetest.pos_to_string(act_p)
+ end
+ minetest.chat_send_player(name, "Last actor on "..nodedesc.." was "..
+ actor..", "..dump(act_seconds).."s ago")
+ end
+ end,
+})
+
+minetest.register_chatcommand("rollback", {
+ params = "<player name> [<seconds>] | :liquid [<seconds>]",
+ description = "revert actions of a player; default for <seconds> is 60",
+ privs = {rollback=true},
+ func = function(name, param)
+ local target_name, seconds = string.match(param, ":([^ ]+) *(%d*)")
+ if not target_name then
+ local player_name = nil;
+ player_name, seconds = string.match(param, "([^ ]+) *(%d*)")
+ if not player_name then
+ minetest.chat_send_player(name, "Invalid parameters. See /help rollback and /help rollback_check")
+ return
+ end
+ target_name = "player:"..player_name
+ end
+ seconds = tonumber(seconds) or 60
+ minetest.chat_send_player(name, "Reverting actions of "..
+ dump(target_name).." since "..dump(seconds).." seconds.")
+ local success, log = minetest.rollback_revert_actions_by(
+ target_name, seconds)
+ for _,line in ipairs(log) do
+ minetest.chat_send_player(name, line)
+ end
+ if success then
+ minetest.chat_send_player(name, "Reverting actions succeeded.")
+ else
+ minetest.chat_send_player(name, "Reverting actions FAILED.")
+ end
+ end,
+})
+
diff --git a/builtin/privileges.lua b/builtin/privileges.lua
index 6cb42c103..9ec09d7f6 100644
--- a/builtin/privileges.lua
+++ b/builtin/privileges.lua
@@ -44,5 +44,5 @@ minetest.register_privilege("fast", {
description = "Can walk fast using the fast_move mode",
give_to_singleplayer = false,
})
-
+minetest.register_privilege("rollback", "Can use the rollback functionality")
diff --git a/doc/lua_api.txt b/doc/lua_api.txt
index d47281b2d..46ea3a86e 100644
--- a/doc/lua_api.txt
+++ b/doc/lua_api.txt
@@ -889,6 +889,14 @@ minetest.get_craft_recipe(output) -> input
stack 5, stack 6, stack 7, stack 8, stack 9 }
^ input.items = nil if no recipe found
+Rollbacks:
+minetest.rollback_get_last_node_actor(p, range, seconds) -> actor, p, seconds
+^ Find who has done something to a node, or near a node
+^ actor: "player:<name>", also "liquid".
+minetest.rollback_revert_actions_by(actor, seconds) -> bool, log messages
+^ Revert latest actions of someone
+^ actor: "player:<name>", also "liquid".
+
Defaults for the on_* item definition functions:
(These return the leftover itemstack)
minetest.item_place_node(itemstack, placer, pointed_thing)
diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index e369b9623..43d7f241a 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -153,6 +153,8 @@ configure_file(
)
set(common_SRCS
+ rollback_interface.cpp
+ rollback.cpp
genericobject.cpp
voxelalgorithms.cpp
sound.cpp
diff --git a/src/content_abm.cpp b/src/content_abm.cpp
index edadfe99e..12dbeea8e 100644
--- a/src/content_abm.cpp
+++ b/src/content_abm.cpp
@@ -26,6 +26,7 @@ with this program; if not, write to the Free Software Foundation, Inc.,
#include "settings.h"
#include "mapblock.h" // For getNodeBlockPos
#include "mapgen.h" // For mapgen::make_tree
+#include "map.h"
#define PP(x) "("<<(x).X<<","<<(x).Y<<","<<(x).Z<<")"
diff --git a/src/content_cao.cpp b/src/content_cao.cpp
index 58ff130f2..aa5c2d674 100644
--- a/src/content_cao.cpp
+++ b/src/content_cao.cpp
@@ -39,6 +39,7 @@ with this program; if not, write to the Free Software Foundation, Inc.,
#include "util/numeric.h" // For IntervalLimiter
#include "util/serialize.h"
#include "util/mathconstants.h"
+#include "map.h"
class Settings;
struct ToolCapabilities;
diff --git a/src/content_cso.cpp b/src/content_cso.cpp
index 6f7ecbe50..666f17734 100644
--- a/src/content_cso.cpp
+++ b/src/content_cso.cpp
@@ -23,6 +23,7 @@ with this program; if not, write to the Free Software Foundation, Inc.,
#include "environment.h"
#include "gamedef.h"
#include "log.h"
+#include "map.h"
static void setBillboardTextureMatrix(scene::IBillboardSceneNode *bill,
float txs, float tys, int col, int row)
diff --git a/src/environment.cpp b/src/environment.cpp
index 02ca1f71b..9390101e7 100644
--- a/src/environment.cpp
+++ b/src/environment.cpp
@@ -349,6 +349,17 @@ ServerEnvironment::~ServerEnvironment()
}
}
+Map & ServerEnvironment::getMap()
+{
+ return *m_map;
+}
+
+ServerMap & ServerEnvironment::getServerMap()
+{
+ return *m_map;
+}
+
+
void ServerEnvironment::serializePlayers(const std::string &savedir)
{
std::string players_path = savedir + "/players";
diff --git a/src/environment.h b/src/environment.h
index 0e4b85e06..6c52b003d 100644
--- a/src/environment.h
+++ b/src/environment.h
@@ -33,11 +33,12 @@ with this program; if not, write to the Free Software Foundation, Inc.,
#include <set>
#include "irrlichttypes_extrabloated.h"
#include "player.h"
-#include "map.h"
#include <ostream>
#include "activeobject.h"
#include "util/container.h"
#include "util/numeric.h"
+#include "mapnode.h"
+#include "mapblock.h"
class Server;
class ServerEnvironment;
@@ -46,6 +47,8 @@ class ServerActiveObject;
typedef struct lua_State lua_State;
class ITextureSource;
class IGameDef;
+class Map;
+class ServerMap;
class ClientMap;
class Environment
@@ -191,11 +194,9 @@ public:
IBackgroundBlockEmerger *emerger);
~ServerEnvironment();
- Map & getMap()
- { return *m_map; }
+ Map & getMap();
- ServerMap & getServerMap()
- { return *m_map; }
+ ServerMap & getServerMap();
lua_State* getLua()
{ return m_lua; }
diff --git a/src/gamedef.h b/src/gamedef.h
index 88c15be78..87918d726 100644
--- a/src/gamedef.h
+++ b/src/gamedef.h
@@ -29,6 +29,7 @@ class ICraftDefManager;
class ITextureSource;
class ISoundManager;
class MtEventManager;
+class IRollbackReportSink;
/*
An interface for fetching game-global definitions like tool and
@@ -54,6 +55,10 @@ public:
// Only usable on the client
virtual ISoundManager* getSoundManager()=0;
virtual MtEventManager* getEventManager()=0;
+
+ // Only usable on the server, and NOT thread-safe. It is usable from the
+ // environment thread.
+ virtual IRollbackReportSink* getRollbackReportSink(){return NULL;}
// Used on the client
virtual bool checkLocalPrivilege(const std::string &priv)
@@ -66,6 +71,7 @@ public:
ITextureSource* tsrc(){return getTextureSource();}
ISoundManager* sound(){return getSoundManager();}
MtEventManager* event(){return getEventManager();}
+ IRollbackReportSink* rollback(){return getRollbackReportSink();}
};
#endif
diff --git a/src/inventorymanager.cpp b/src/inventorymanager.cpp
index 06978fbb9..85668d645 100644
--- a/src/inventorymanager.cpp
+++ b/src/inventorymanager.cpp
@@ -25,6 +25,7 @@ with this program; if not, write to the Free Software Foundation, Inc.,
#include "main.h" // for g_settings
#include "settings.h"
#include "craftdef.h"
+#include "rollback_interface.h"
#define PP(x) "("<<(x).X<<","<<(x).Y<<","<<(x).Z<<")"
@@ -200,6 +201,14 @@ void IMoveAction::apply(InventoryManager *mgr, ServerActiveObject *player, IGame
}
/*
+ Do not handle rollback if both inventories are that of the same player
+ */
+ bool ignore_rollback = (
+ from_inv.type == InventoryLocation::PLAYER &&
+ to_inv.type == InventoryLocation::PLAYER &&
+ from_inv.name == to_inv.name);
+
+ /*
Collect information of endpoints
*/
@@ -344,6 +353,41 @@ void IMoveAction::apply(InventoryManager *mgr, ServerActiveObject *player, IGame
<<std::endl;
/*
+ Record rollback information
+ */
+ if(!ignore_rollback)
+ {
+ IRollbackReportSink *rollback = gamedef->rollback();
+
+ // If source is not infinite, record item take
+ if(!src_can_take_count != -1){
+ RollbackAction action;
+ std::string loc;
+ {
+ std::ostringstream os(std::ios::binary);
+ from_inv.serialize(os);
+ loc = os.str();
+ }
+ action.setModifyInventoryStack(loc, from_list, from_i, false,
+ src_item.getItemString());
+ rollback->reportAction(action);
+ }
+ // If destination is not infinite, record item put
+ if(!dst_can_put_count != -1){
+ RollbackAction action;
+ std::string loc;
+ {
+ std::ostringstream os(std::ios::binary);
+ to_inv.serialize(os);
+ loc = os.str();
+ }
+ action.setModifyInventoryStack(loc, to_list, to_i, true,
+ src_item.getItemString());
+ rollback->reportAction(action);
+ }
+ }
+
+ /*
Report move to endpoints
*/
@@ -405,7 +449,7 @@ void IMoveAction::apply(InventoryManager *mgr, ServerActiveObject *player, IGame
L, from_inv.p, from_list, from_i, src_item, player);
}
}
-
+
mgr->setInventoryModified(from_inv);
if(inv_from != inv_to)
mgr->setInventoryModified(to_inv);
@@ -489,6 +533,11 @@ void IDropAction::apply(InventoryManager *mgr, ServerActiveObject *player, IGame
}
/*
+ Do not handle rollback if inventory is player's
+ */
+ bool ignore_src_rollback = (from_inv.type == InventoryLocation::PLAYER);
+
+ /*
Collect information of endpoints
*/
@@ -575,6 +624,28 @@ void IDropAction::apply(InventoryManager *mgr, ServerActiveObject *player, IGame
scriptapi_nodemeta_inventory_on_take(
L, from_inv.p, from_list, from_i, src_item, player);
}
+
+ /*
+ Record rollback information
+ */
+ if(!ignore_src_rollback)
+ {
+ IRollbackReportSink *rollback = gamedef->rollback();
+
+ // If source is not infinite, record item take
+ if(!src_can_take_count != -1){
+ RollbackAction action;
+ std::string loc;
+ {
+ std::ostringstream os(std::ios::binary);
+ from_inv.serialize(os);
+ loc = os.str();
+ }
+ action.setModifyInventoryStack(loc, from_list, from_i,
+ false, src_item.getItemString());
+ rollback->reportAction(action);
+ }
+ }
}
void IDropAction::clientApply(InventoryManager *mgr, IGameDef *gamedef)
diff --git a/src/map.cpp b/src/map.cpp
index dc1f45068..734122105 100644
--- a/src/map.cpp
+++ b/src/map.cpp
@@ -32,6 +32,7 @@ with this program; if not, write to the Free Software Foundation, Inc.,
#include "nodedef.h"
#include "gamedef.h"
#include "util/directiontables.h"
+#include "rollback_interface.h"
#define PP(x) "("<<(x).X<<","<<(x).Y<<","<<(x).Z<<")"
@@ -932,12 +933,12 @@ void Map::updateLighting(core::map<v3s16, MapBlock*> & a_blocks,
void Map::addNodeAndUpdate(v3s16 p, MapNode n,
core::map<v3s16, MapBlock*> &modified_blocks)
{
- INodeDefManager *nodemgr = m_gamedef->ndef();
+ INodeDefManager *ndef = m_gamedef->ndef();
/*PrintInfo(m_dout);
m_dout<<DTIME<<"Map::addNodeAndUpdate(): p=("
<<p.X<<","<<p.Y<<","<<p.Z<<")"<<std::endl;*/
-
+
/*
From this node to nodes underneath:
If lighting is sunlight (1.0), unlight neighbours and
@@ -950,6 +951,11 @@ void Map::addNodeAndUpdate(v3s16 p, MapNode n,
bool node_under_sunlight = true;
core::map<v3s16, bool> light_sources;
+
+ /*
+ Collect old node for rollback
+ */
+ RollbackNode rollback_oldnode(this, p, m_gamedef);
/*
If there is a node at top and it doesn't have sunlight,
@@ -960,7 +966,7 @@ void Map::addNodeAndUpdate(v3s16 p, MapNode n,
try{
MapNode topnode = getNode(toppos);
- if(topnode.getLight(LIGHTBANK_DAY, nodemgr) != LIGHT_SUN)
+ if(topnode.getLight(LIGHTBANK_DAY, ndef) != LIGHT_SUN)
node_under_sunlight = false;
}
catch(InvalidPositionException &e)
@@ -980,7 +986,7 @@ void Map::addNodeAndUpdate(v3s16 p, MapNode n,
{
enum LightBank bank = banks[i];
- u8 lightwas = getNode(p).getLight(bank, nodemgr);
+ u8 lightwas = getNode(p).getLight(bank, ndef);
// Add the block of the added node to modified_blocks
v3s16 blockpos = getNodeBlockPos(p);
@@ -997,16 +1003,16 @@ void Map::addNodeAndUpdate(v3s16 p, MapNode n,
// light again into this.
unLightNeighbors(bank, p, lightwas, light_sources, modified_blocks);
- n.setLight(bank, 0, nodemgr);
+ n.setLight(bank, 0, ndef);
}
/*
If node lets sunlight through and is under sunlight, it has
sunlight too.
*/
- if(node_under_sunlight && nodemgr->get(n).sunlight_propagates)
+ if(node_under_sunlight && ndef->get(n).sunlight_propagates)
{
- n.setLight(LIGHTBANK_DAY, LIGHT_SUN, nodemgr);
+ n.setLight(LIGHTBANK_DAY, LIGHT_SUN, ndef);
}
/*
@@ -1028,7 +1034,7 @@ void Map::addNodeAndUpdate(v3s16 p, MapNode n,
TODO: This could be optimized by mass-unlighting instead
of looping
*/
- if(node_under_sunlight && !nodemgr->get(n).sunlight_propagates)
+ if(node_under_sunlight && !ndef->get(n).sunlight_propagates)
{
s16 y = p.Y - 1;
for(;; y--){
@@ -1044,12 +1050,12 @@ void Map::addNodeAndUpdate(v3s16 p, MapNode n,
break;
}
- if(n2.getLight(LIGHTBANK_DAY, nodemgr) == LIGHT_SUN)
+ if(n2.getLight(LIGHTBANK_DAY, ndef) == LIGHT_SUN)
{
unLightNeighbors(LIGHTBANK_DAY,
- n2pos, n2.getLight(LIGHTBANK_DAY, nodemgr),
+ n2pos, n2.getLight(LIGHTBANK_DAY, ndef),
light_sources, modified_blocks);
- n2.setLight(LIGHTBANK_DAY, 0, nodemgr);
+ n2.setLight(LIGHTBANK_DAY, 0, ndef);
setNode(n2pos, n2);
}
else
@@ -1079,6 +1085,17 @@ void Map::addNodeAndUpdate(v3s16 p, MapNode n,
}
/*
+ Report for rollback
+ */
+ if(m_gamedef->rollback())
+ {
+ RollbackNode rollback_newnode(this, p, m_gamedef);
+ RollbackAction action;
+ action.setSetNode(p, rollback_oldnode, rollback_newnode);
+ m_gamedef->rollback()->reportAction(action);
+ }
+
+ /*
Add neighboring liquid nodes and the node itself if it is
liquid (=water node was added) to transform queue.
*/
@@ -1099,7 +1116,7 @@ void Map::addNodeAndUpdate(v3s16 p, MapNode n,
v3s16 p2 = p + dirs[i];
MapNode n2 = getNode(p2);
- if(nodemgr->get(n2).isLiquid() || n2.getContent() == CONTENT_AIR)
+ if(ndef->get(n2).isLiquid() || n2.getContent() == CONTENT_AIR)
{
m_transforming_liquid.push_back(p2);
}
@@ -1115,7 +1132,7 @@ void Map::addNodeAndUpdate(v3s16 p, MapNode n,
void Map::removeNodeAndUpdate(v3s16 p,
core::map<v3s16, MapBlock*> &modified_blocks)
{
- INodeDefManager *nodemgr = m_gamedef->ndef();
+ INodeDefManager *ndef = m_gamedef->ndef();
/*PrintInfo(m_dout);
m_dout<<DTIME<<"Map::removeNodeAndUpdate(): p=("
@@ -1129,13 +1146,18 @@ void Map::removeNodeAndUpdate(v3s16 p,
content_t replace_material = CONTENT_AIR;
/*
+ Collect old node for rollback
+ */
+ RollbackNode rollback_oldnode(this, p, m_gamedef);
+
+ /*
If there is a node at top and it doesn't have sunlight,
there will be no sunlight going down.
*/
try{
MapNode topnode = getNode(toppos);
- if(topnode.getLight(LIGHTBANK_DAY, nodemgr) != LIGHT_SUN)
+ if(topnode.getLight(LIGHTBANK_DAY, ndef) != LIGHT_SUN)
node_under_sunlight = false;
}
catch(InvalidPositionException &e)
@@ -1157,7 +1179,7 @@ void Map::removeNodeAndUpdate(v3s16 p,
Unlight neighbors (in case the node is a light source)
*/
unLightNeighbors(bank, p,
- getNode(p).getLight(bank, nodemgr),
+ getNode(p).getLight(bank, ndef),
light_sources, modified_blocks);
}
@@ -1219,7 +1241,7 @@ void Map::removeNodeAndUpdate(v3s16 p,
// TODO: Is this needed? Lighting is cleared up there already.
try{
MapNode n = getNode(p);
- n.setLight(LIGHTBANK_DAY, 0, nodemgr);
+ n.setLight(LIGHTBANK_DAY, 0, ndef);
setNode(p, n);
}
catch(InvalidPositionException &e)
@@ -1255,6 +1277,17 @@ void Map::removeNodeAndUpdate(v3s16 p,
}
/*
+ Report for rollback
+ */
+ if(m_gamedef->rollback())
+ {
+ RollbackNode rollback_newnode(this, p, m_gamedef);
+ RollbackAction action;
+ action.setSetNode(p, rollback_oldnode, rollback_newnode);
+ m_gamedef->rollback()->reportAction(action);
+ }
+
+ /*
Add neighboring liquid nodes and this node to transform queue.
(it's vital for the node itself to get updated last.)
*/
@@ -1275,7 +1308,7 @@ void Map::removeNodeAndUpdate(v3s16 p,
v3s16 p2 = p + dirs[i];
MapNode n2 = getNode(p2);
- if(nodemgr->get(n2).isLiquid() || n2.getContent() == CONTENT_AIR)
+ if(ndef->get(n2).isLiquid() || n2.getContent() == CONTENT_AIR)
{
m_transforming_liquid.push_back(p2);
}
@@ -1588,6 +1621,11 @@ void Map::transformLiquids(core::map<v3s16, MapBlock*> & modified_blocks)
DSTACK(__FUNCTION_NAME);
//TimeTaker timer("transformLiquids()");
+ /*
+ If something goes wrong, liquids are to blame
+ */
+ RollbackScopeActor rollback_scope(m_gamedef->rollback(), "liquid");
+
u32 loopcount = 0;
u32 initial_size = m_transforming_liquid.size();
@@ -1791,7 +1829,22 @@ void Map::transformLiquids(core::map<v3s16, MapBlock*> & modified_blocks)
n0.param2 = ~(LIQUID_LEVEL_MASK | LIQUID_FLOW_DOWN_MASK);
}
n0.setContent(new_node_content);
+
+ // Get old node for rollback
+ RollbackNode rollback_oldnode(this, p0, m_gamedef);
+
+ // Set node
setNode(p0, n0);
+
+ // Report for rollback
+ if(m_gamedef->rollback())
+ {
+ RollbackNode rollback_newnode(this, p0, m_gamedef);
+ RollbackAction action;
+ action.setSetNode(p0, rollback_oldnode, rollback_newnode);
+ m_gamedef->rollback()->reportAction(action);
+ }
+
v3s16 blockpos = getNodeBlockPos(p0);
MapBlock *block = getBlockNoCreateNoEx(blockpos);
if(block != NULL) {
diff --git a/src/map.h b/src/map.h
index b561e5e72..30cf626bb 100644
--- a/src/map.h
+++ b/src/map.h
@@ -44,6 +44,7 @@ class ServerMapSector;
class MapBlock;
class NodeMetadata;
class IGameDef;
+class IRollbackReportSink;
namespace mapgen{
struct BlockMakeData;
@@ -169,7 +170,7 @@ public:
void removeEventReceiver(MapEventReceiver *event_receiver);
// event shall be deleted by caller after the call.
void dispatchEvent(MapEditEvent *event);
-
+
// On failure returns NULL
MapSector * getSectorNoGenerateNoExNoLock(v2s16 p2d);
// Same as the above (there exists no lock anymore)
@@ -336,7 +337,7 @@ protected:
IGameDef *m_gamedef;
core::map<MapEventReceiver*, bool> m_event_receivers;
-
+
core::map<v2s16, MapSector*> m_sectors;
// Be sure to set this to NULL when the cached sector is deleted
diff --git a/src/rollback.cpp b/src/rollback.cpp
new file mode 100644
index 000000000..3fe791050
--- /dev/null
+++ b/src/rollback.cpp
@@ -0,0 +1,293 @@
+/*
+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.h"
+#include <fstream>
+#include <list>
+#include <sstream>
+#include "log.h"
+#include "mapnode.h"
+#include "gamedef.h"
+#include "nodedef.h"
+#include "util/serialize.h"
+#include "util/string.h"
+#include "strfnd.h"
+#include "inventorymanager.h" // deserializing InventoryLocations
+
+#define PP(x) "("<<(x).X<<","<<(x).Y<<","<<(x).Z<<")"
+
+class RollbackManager: public IRollbackManager
+{
+public:
+ // IRollbackManager interface
+
+ void reportAction(const RollbackAction &action_)
+ {
+ // Ignore if not important
+ if(!action_.isImportant(m_gamedef))
+ return;
+ RollbackAction action = action_;
+ action.unix_time = time(0);
+ action.actor = m_current_actor;
+ infostream<<"RollbackManager::reportAction():"
+ <<" time="<<action.unix_time
+ <<" actor=\""<<action.actor<<"\""
+ <<" action="<<action.toString()
+ <<std::endl;
+ addAction(action);
+ }
+ std::string getActor()
+ {
+ return m_current_actor;
+ }
+ void setActor(const std::string &actor)
+ {
+ m_current_actor = actor;
+ }
+ void flush()
+ {
+ infostream<<"RollbackManager::flush()"<<std::endl;
+ std::ofstream of(m_filepath.c_str(), std::ios::app);
+ if(!of.good()){
+ errorstream<<"RollbackManager::flush(): Could not open file "
+ <<"for appending: \""<<m_filepath<<"\""<<std::endl;
+ return;
+ }
+ for(std::list<RollbackAction>::const_iterator
+ i = m_action_todisk_buffer.begin();
+ i != m_action_todisk_buffer.end(); i++)
+ {
+ // Do not save stuff that does not have an actor
+ if(i->actor == "")
+ continue;
+ of<<i->unix_time;
+ of<<" ";
+ of<<serializeJsonString(i->actor);
+ of<<" ";
+ std::string action_s = i->toString();
+ of<<action_s<<std::endl;
+ }
+ m_action_todisk_buffer.clear();
+ }
+
+ // Other
+
+ RollbackManager(const std::string &filepath, IGameDef *gamedef):
+ m_filepath(filepath),
+ m_gamedef(gamedef)
+ {
+ infostream<<"RollbackManager::RollbackManager("<<filepath<<")"
+ <<std::endl;
+ }
+ ~RollbackManager()
+ {
+ infostream<<"RollbackManager::~RollbackManager()"<<std::endl;
+ flush();
+ }
+
+ void addAction(const RollbackAction &action)
+ {
+ m_action_todisk_buffer.push_back(action);
+ m_action_latest_buffer.push_back(action);
+
+ // Flush to disk sometimes
+ if(m_action_todisk_buffer.size() >= 100)
+ flush();
+ }
+
+ bool readFile(std::list<RollbackAction> &dst)
+ {
+ // Load whole file to memory
+ std::ifstream f(m_filepath.c_str(), std::ios::in);
+ if(!f.good()){
+ errorstream<<"RollbackManager::readFile(): Could not open "
+ <<"file for reading: \""<<m_filepath<<"\""<<std::endl;
+ return false;
+ }
+ for(;;){
+ if(f.eof() || !f.good())
+ break;
+ std::string line;
+ std::getline(f, line);
+ line = trim(line);
+ if(line == "")
+ continue;
+ std::istringstream is(line);
+
+ try{
+ std::string action_time_raw;
+ std::getline(is, action_time_raw, ' ');
+ std::string action_actor;
+ try{
+ action_actor = deSerializeJsonString(is);
+ }catch(SerializationError &e){
+ errorstream<<"RollbackManager: Error deserializing actor: "
+ <<e.what()<<std::endl;
+ throw e;
+ }
+ RollbackAction action;
+ action.unix_time = stoi(action_time_raw);
+ action.actor = action_actor;
+ int c = is.get();
+ if(c != ' '){
+ is.putback(c);
+ throw SerializationError("readFile(): second ' ' not found");
+ }
+ action.fromStream(is);
+ /*infostream<<"RollbackManager::readFile(): Action from disk: "
+ <<action.toString()<<std::endl;*/
+ dst.push_back(action);
+ }
+ catch(SerializationError &e){
+ errorstream<<"RollbackManager: Error on line: "<<line<<std::endl;
+ errorstream<<"RollbackManager: ^ error: "<<e.what()<<std::endl;
+ }
+ }
+ return true;
+ }
+
+ std::list<RollbackAction> getEntriesSince(int first_time)
+ {
+ infostream<<"RollbackManager::getEntriesSince("<<first_time<<")"<<std::endl;
+ // Collect enough data to this buffer
+ std::list<RollbackAction> action_buffer;
+ // Use the latest buffer if it is long enough
+ if(!m_action_latest_buffer.empty() &&
+ m_action_latest_buffer.begin()->unix_time <= first_time){
+ action_buffer = m_action_latest_buffer;
+ }
+ else
+ {
+ // Save all remaining stuff
+ flush();
+ // Load whole file to memory
+ bool good = readFile(action_buffer);
+ if(!good){
+ errorstream<<"RollbackManager::getEntriesSince(): Failed to"
+ <<" open file; using data in memory."<<std::endl;
+ action_buffer = m_action_latest_buffer;
+ }
+ }
+ return action_buffer;
+ }
+
+ std::string getLastNodeActor(v3s16 p, int range, int seconds,
+ v3s16 *act_p, int *act_seconds)
+ {
+ infostream<<"RollbackManager::getLastNodeActor("<<PP(p)
+ <<", "<<seconds<<")"<<std::endl;
+ // Figure out time
+ int cur_time = time(0);
+ int first_time = cur_time - seconds;
+
+ std::list<RollbackAction> action_buffer = getEntriesSince(first_time);
+
+ std::list<RollbackAction> result;
+
+ for(std::list<RollbackAction>::const_reverse_iterator
+ i = action_buffer.rbegin();
+ i != action_buffer.rend(); i++)
+ {
+ if(i->unix_time < first_time)
+ break;
+
+ // Find position of action or continue
+ v3s16 action_p;
+
+ if(i->type == RollbackAction::TYPE_SET_NODE)
+ {
+ action_p = i->p;
+ }
+ else if(i->type == RollbackAction::TYPE_MODIFY_INVENTORY_STACK)
+ {
+ InventoryLocation loc;
+ loc.deSerialize(i->inventory_location);
+ if(loc.type != InventoryLocation::NODEMETA)
+ continue;
+ action_p = loc.p;
+ }
+ else
+ continue;
+
+ if(range == 0){
+ if(action_p != p)
+ continue;
+ } else {
+ if(abs(action_p.X - p.X) > range ||
+ abs(action_p.Y - p.Y) > range ||
+ abs(action_p.Z - p.Z) > range)
+ continue;
+ }
+
+ if(act_p)
+ *act_p = action_p;
+ if(act_seconds)
+ *act_seconds = cur_time - i->unix_time;
+ return i->actor;
+ }
+ return "";
+ }
+
+ std::list<RollbackAction> getRevertActions(const std::string &actor_filter,
+ int seconds)
+ {
+ infostream<<"RollbackManager::getRevertActions("<<actor_filter
+ <<", "<<seconds<<")"<<std::endl;
+ // Figure out time
+ int cur_time = time(0);
+ int first_time = cur_time - seconds;
+
+ std::list<RollbackAction> action_buffer = getEntriesSince(first_time);
+
+ std::list<RollbackAction> result;
+
+ for(std::list<RollbackAction>::const_reverse_iterator
+ i = action_buffer.rbegin();
+ i != action_buffer.rend(); i++)
+ {
+ if(i->unix_time < first_time)
+ break;
+ if(i->actor != actor_filter)
+ continue;
+ const RollbackAction &action = *i;
+ /*infostream<<"RollbackManager::revertAction(): Should revert"
+ <<" time="<<action.unix_time
+ <<" actor=\""<<action.actor<<"\""
+ <<" action="<<action.toString()
+ <<std::endl;*/
+ result.push_back(action);
+ }
+
+ return result;
+ }
+
+private:
+ std::string m_filepath;
+ IGameDef *m_gamedef;
+ std::string m_current_actor;
+ std::list<RollbackAction> m_action_todisk_buffer;
+ std::list<RollbackAction> m_action_latest_buffer;
+};
+
+IRollbackManager *createRollbackManager(const std::string &filepath, IGameDef *gamedef)
+{
+ return new RollbackManager(filepath, gamedef);
+}
+
+
diff --git a/src/rollback.h b/src/rollback.h
new file mode 100644
index 000000000..b5428c451
--- /dev/null
+++ b/src/rollback.h
@@ -0,0 +1,51 @@
+/*
+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.
+*/
+
+#ifndef ROLLBACK_HEADER
+#define ROLLBACK_HEADER
+
+#include <string>
+#include "irr_v3d.h"
+#include "rollback_interface.h"
+#include <list>
+
+class IGameDef;
+
+class IRollbackManager: public IRollbackReportSink
+{
+public:
+ // IRollbackReportManager
+ virtual void reportAction(const RollbackAction &action) = 0;
+ virtual std::string getActor() = 0;
+ virtual void setActor(const std::string &actor) = 0;
+
+ virtual ~IRollbackManager(){}
+ virtual void flush() = 0;
+ // Get last actor that did something to position p, but not further than
+ // <seconds> in history
+ virtual std::string getLastNodeActor(v3s16 p, int range, int seconds,
+ v3s16 *act_p, int *act_seconds) = 0;
+ // Get actions to revert <seconds> of history made by <actor>
+ virtual std::list<RollbackAction> getRevertActions(const std::string &actor,
+ int seconds) = 0;
+};
+
+IRollbackManager *createRollbackManager(const std::string &filepath, IGameDef *gamedef);
+
+#endif
diff --git a/src/rollback_interface.cpp b/src/rollback_interface.cpp
new file mode 100644
index 000000000..e15fe3da3
--- /dev/null
+++ b/src/rollback_interface.cpp
@@ -0,0 +1,398 @@
+/*
+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::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;
+}
+
diff --git a/src/rollback_interface.h b/src/rollback_interface.h
new file mode 100644
index 000000000..0f0a11885
--- /dev/null
+++ b/src/rollback_interface.h
@@ -0,0 +1,145 @@
+/*
+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.
+*/
+
+#ifndef ROLLBACK_INTERFACE_HEADER
+#define ROLLBACK_INTERFACE_HEADER
+
+#include "irr_v3d.h"
+#include <string>
+#include <iostream>
+#include "exceptions.h"
+
+class Map;
+class IGameDef;
+struct MapNode;
+class InventoryManager;
+
+struct RollbackNode
+{
+ std::string name;
+ int param1;
+ int param2;
+ std::string meta;
+
+ bool operator==(const RollbackNode &other)
+ {
+ return (name == other.name && param1 == other.param1 &&
+ param2 == other.param2 && meta == other.meta);
+ }
+ bool operator!=(const RollbackNode &other)
+ {
+ return !(*this == other);
+ }
+
+ RollbackNode():
+ param1(0),
+ param2(0)
+ {}
+
+ RollbackNode(Map *map, v3s16 p, IGameDef *gamedef);
+};
+
+struct RollbackAction
+{
+ enum Type{
+ TYPE_NOTHING,
+ TYPE_SET_NODE,
+ TYPE_MODIFY_INVENTORY_STACK,
+ } type;
+
+ int unix_time;
+ std::string actor;
+
+ v3s16 p;
+ RollbackNode n_old;
+ RollbackNode n_new;
+
+ std::string inventory_location;
+ std::string inventory_list;
+ u32 inventory_index;
+ bool inventory_add;
+ std::string inventory_stack;
+
+ RollbackAction():
+ type(TYPE_NOTHING)
+ {}
+
+ void setSetNode(v3s16 p_, const RollbackNode &n_old_,
+ const RollbackNode &n_new_)
+ {
+ type = TYPE_SET_NODE;
+ p = p_;
+ n_old = n_old_;
+ n_new = n_new_;
+ }
+
+ void setModifyInventoryStack(const std::string &inventory_location_,
+ const std::string &inventory_list_, int index_,
+ bool add_, const std::string &inventory_stack_)
+ {
+ type = TYPE_MODIFY_INVENTORY_STACK;
+ inventory_location = inventory_location_;
+ inventory_list = inventory_list_;
+ inventory_index = index_;
+ inventory_add = add_;
+ inventory_stack = inventory_stack_;
+ }
+
+ // String should not contain newlines or nulls
+ std::string toString() const;
+ void fromStream(std::istream &is) throw(SerializationError);
+
+ // Eg. flowing water level changes are not important
+ bool isImportant(IGameDef *gamedef) const;
+
+ bool applyRevert(Map *map, InventoryManager *imgr, IGameDef *gamedef) const;
+};
+
+class IRollbackReportSink
+{
+public:
+ virtual ~IRollbackReportSink(){}
+ virtual void reportAction(const RollbackAction &action) = 0;
+ virtual std::string getActor() = 0;
+ virtual void setActor(const std::string &actor) = 0;
+};
+
+class RollbackScopeActor
+{
+public:
+ RollbackScopeActor(IRollbackReportSink *sink, const std::string &actor):
+ m_sink(sink)
+ {
+ if(m_sink){
+ m_actor_was = m_sink->getActor();
+ m_sink->setActor(actor);
+ }
+ }
+ ~RollbackScopeActor()
+ {
+ if(m_sink){
+ m_sink->setActor(m_actor_was);
+ }
+ }
+private:
+ IRollbackReportSink *m_sink;
+ std::string m_actor_was;
+};
+
+#endif
diff --git a/src/scriptapi.cpp b/src/scriptapi.cpp
index e1d918542..61488abb4 100644
--- a/src/scriptapi.cpp
+++ b/src/scriptapi.cpp
@@ -47,6 +47,7 @@ extern "C" {
#include "daynightratio.h"
#include "noise.h" // PseudoRandom for LuaPseudoRandom
#include "util/pointedthing.h"
+#include "rollback.h"
static void stackDump(lua_State *L, std::ostream &o)
{
@@ -2106,6 +2107,7 @@ private:
static void reportMetadataChange(NodeMetaRef *ref)
{
+ // NOTE: This same code is in rollback_interface.cpp
// Inform other things that the metadata has changed
v3s16 blockpos = getNodeBlockPos(ref->m_p);
MapEditEvent event;
@@ -4853,6 +4855,55 @@ static int l_get_craft_recipe(lua_State *L)
return 1;
}
+// rollback_get_last_node_actor(p, range, seconds) -> actor, p, seconds
+static int l_rollback_get_last_node_actor(lua_State *L)
+{
+ v3s16 p = read_v3s16(L, 1);
+ int range = luaL_checknumber(L, 2);
+ int seconds = luaL_checknumber(L, 3);
+ Server *server = get_server(L);
+ IRollbackManager *rollback = server->getRollbackManager();
+ v3s16 act_p;
+ int act_seconds = 0;
+ std::string actor = rollback->getLastNodeActor(p, range, seconds, &act_p, &act_seconds);
+ lua_pushstring(L, actor.c_str());
+ push_v3s16(L, act_p);
+ lua_pushnumber(L, act_seconds);
+ return 3;
+}
+
+// rollback_revert_actions_by(actor, seconds) -> bool, log messages
+static int l_rollback_revert_actions_by(lua_State *L)
+{
+ std::string actor = luaL_checkstring(L, 1);
+ int seconds = luaL_checknumber(L, 2);
+ Server *server = get_server(L);
+ IRollbackManager *rollback = server->getRollbackManager();
+ std::list<RollbackAction> actions = rollback->getRevertActions(actor, seconds);
+ std::list<std::string> log;
+ bool success = server->rollbackRevertActions(actions, &log);
+ // Push boolean result
+ lua_pushboolean(L, success);
+ // Get the table insert function and push the log table
+ lua_getglobal(L, "table");
+ lua_getfield(L, -1, "insert");
+ int table_insert = lua_gettop(L);
+ lua_newtable(L);
+ int table = lua_gettop(L);
+ for(std::list<std::string>::const_iterator i = log.begin();
+ i != log.end(); i++)
+ {
+ lua_pushvalue(L, table_insert);
+ lua_pushvalue(L, table);
+ lua_pushstring(L, i->c_str());
+ if(lua_pcall(L, 2, 0, 0))
+ script_error(L, "error: %s", lua_tostring(L, -1));
+ }
+ lua_remove(L, -2); // Remove table
+ lua_remove(L, -2); // Remove insert
+ return 2;
+}
+
static const struct luaL_Reg minetest_f [] = {
{"debug", l_debug},
{"log", l_log},
@@ -4880,6 +4931,8 @@ static const struct luaL_Reg minetest_f [] = {
{"notify_authentication_modified", l_notify_authentication_modified},
{"get_craft_result", l_get_craft_result},
{"get_craft_recipe", l_get_craft_recipe},
+ {"rollback_get_last_node_actor", l_rollback_get_last_node_actor},
+ {"rollback_revert_actions_by", l_rollback_revert_actions_by},
{NULL, NULL}
};
diff --git a/src/server.cpp b/src/server.cpp
index 21c936e69..a868a0425 100644
--- a/src/server.cpp
+++ b/src/server.cpp
@@ -54,6 +54,7 @@ with this program; if not, write to the Free Software Foundation, Inc.,
#include "util/string.h"
#include "util/pointedthing.h"
#include "util/mathconstants.h"
+#include "rollback.h"
#define PP(x) "("<<(x).X<<","<<(x).Y<<","<<(x).Z<<")"
@@ -934,6 +935,8 @@ Server::Server(
m_env(NULL),
m_con(PROTOCOL_ID, 512, CONNECTION_TIMEOUT, this),
m_banmanager(path_world+DIR_DELIM+"ipban.txt"),
+ m_rollback(NULL),
+ m_rollback_sink_enabled(true),
m_lua(NULL),
m_itemdef(createItemDefManager()),
m_nodedef(createNodeDefManager()),
@@ -973,6 +976,10 @@ Server::Server(
infostream<<"- config: "<<m_path_config<<std::endl;
infostream<<"- game: "<<m_gamespec.path<<std::endl;
+ // Create rollback manager
+ std::string rollback_path = m_path_world+DIR_DELIM+"rollback.txt";
+ m_rollback = createRollbackManager(rollback_path, this);
+
// Add world mod search path
m_modspaths.push_front(m_path_world + DIR_DELIM + "worldmods");
// Add addon mod search path
@@ -1049,7 +1056,7 @@ Server::Server(
m_env = new ServerEnvironment(new ServerMap(path_world, this), m_lua,
this, this);
-
+
// Give environment reference to scripting api
scriptapi_add_environment(m_lua, m_env);
@@ -1152,6 +1159,7 @@ Server::~Server()
// Delete things in the reverse order of creation
delete m_env;
+ delete m_rollback;
delete m_event;
delete m_itemdef;
delete m_nodedef;
@@ -2481,6 +2489,10 @@ void Server::ProcessData(u8 *data, u32 datasize, u16 peer_id)
return;
}
+ // If something goes wrong, this player is to blame
+ RollbackScopeActor rollback_scope(m_rollback,
+ std::string("player:")+player->getName());
+
/*
Note: Always set inventory not sent, to repair cases
where the client made a bad prediction.
@@ -2950,6 +2962,12 @@ void Server::ProcessData(u8 *data, u32 datasize, u16 peer_id)
}
/*
+ If something goes wrong, this player is to blame
+ */
+ RollbackScopeActor rollback_scope(m_rollback,
+ std::string("player:")+player->getName());
+
+ /*
0: start digging or punch object
*/
if(action == 0)
@@ -3204,8 +3222,23 @@ void Server::ProcessData(u8 *data, u32 datasize, u16 peer_id)
fields[fieldname] = fieldvalue;
}
+ // If something goes wrong, this player is to blame
+ RollbackScopeActor rollback_scope(m_rollback,
+ std::string("player:")+player->getName());
+
+ // Check the target node for rollback data; leave others unnoticed
+ RollbackNode rn_old(&m_env->getMap(), p, this);
+
scriptapi_node_on_receive_fields(m_lua, p, formname, fields,
playersao);
+
+ // Report rollback data
+ RollbackNode rn_new(&m_env->getMap(), p, this);
+ if(rollback() && rn_new != rn_old){
+ RollbackAction action;
+ action.setSetNode(p, rn_old, rn_new);
+ rollback()->reportAction(action);
+ }
}
else if(command == TOSERVER_INVENTORY_FIELDS)
{
@@ -4522,6 +4555,73 @@ Inventory* Server::createDetachedInventory(const std::string &name)
return inv;
}
+class BoolScopeSet
+{
+public:
+ BoolScopeSet(bool *dst, bool val):
+ m_dst(dst)
+ {
+ m_orig_state = *m_dst;
+ *m_dst = val;
+ }
+ ~BoolScopeSet()
+ {
+ *m_dst = m_orig_state;
+ }
+private:
+ bool *m_dst;
+ bool m_orig_state;
+};
+
+// actions: time-reversed list
+// Return value: success/failure
+bool Server::rollbackRevertActions(const std::list<RollbackAction> &actions,
+ std::list<std::string> *log)
+{
+ infostream<<"Server::rollbackRevertActions(len="<<actions.size()<<")"<<std::endl;
+ ServerMap *map = (ServerMap*)(&m_env->getMap());
+ // Disable rollback report sink while reverting
+ BoolScopeSet rollback_scope_disable(&m_rollback_sink_enabled, false);
+
+ // Fail if no actions to handle
+ if(actions.empty()){
+ log->push_back("Nothing to do.");
+ return false;
+ }
+
+ int num_tried = 0;
+ int num_failed = 0;
+
+ for(std::list<RollbackAction>::const_iterator
+ i = actions.begin();
+ i != actions.end(); i++)
+ {
+ const RollbackAction &action = *i;
+ num_tried++;
+ bool success = action.applyRevert(map, this, this);
+ if(!success){
+ num_failed++;
+ std::ostringstream os;
+ os<<"Revert of step ("<<num_tried<<") "<<action.toString()<<" failed";
+ infostream<<"Map::rollbackRevertActions(): "<<os.str()<<std::endl;
+ if(log)
+ log->push_back(os.str());
+ }else{
+ std::ostringstream os;
+ os<<"Succesfully reverted step ("<<num_tried<<") "<<action.toString();
+ infostream<<"Map::rollbackRevertActions(): "<<os.str()<<std::endl;
+ if(log)
+ log->push_back(os.str());
+ }
+ }
+
+ infostream<<"Map::rollbackRevertActions(): "<<num_failed<<"/"<<num_tried
+ <<" failed"<<std::endl;
+
+ // Call it done if less than half failed
+ return num_failed <= num_tried/2;
+}
+
// IGameDef interface
// Under envlock
IItemDefManager* Server::getItemDefManager()
@@ -4552,6 +4652,12 @@ MtEventManager* Server::getEventManager()
{
return m_event;
}
+IRollbackReportSink* Server::getRollbackReportSink()
+{
+ if(!m_rollback_sink_enabled)
+ return NULL;
+ return m_rollback;
+}
IWritableItemDefManager* Server::getWritableItemDefManager()
{
diff --git a/src/server.h b/src/server.h
index 4316bc21f..668d42416 100644
--- a/src/server.h
+++ b/src/server.h
@@ -36,6 +36,8 @@ with this program; if not, write to the Free Software Foundation, Inc.,
#include "sound.h"
#include "util/thread.h"
#include "util/string.h"
+#include "rollback_interface.h" // Needed for rollbackRevertActions()
+#include <list> // Needed for rollbackRevertActions()
struct LuaState;
typedef struct lua_State lua_State;
@@ -44,6 +46,7 @@ class IWritableNodeDefManager;
class IWritableCraftDefManager;
class EventManager;
class PlayerSAO;
+class IRollbackManager;
class ServerError : public std::exception
{
@@ -543,6 +546,13 @@ public:
// Envlock and conlock should be locked when using Lua
lua_State *getLua(){ return m_lua; }
+
+ // Envlock should be locked when using the rollback manager
+ IRollbackManager *getRollbackManager(){ return m_rollback; }
+ // actions: time-reversed list
+ // Return value: success/failure
+ bool rollbackRevertActions(const std::list<RollbackAction> &actions,
+ std::list<std::string> *log);
// IGameDef interface
// Under envlock
@@ -553,6 +563,7 @@ public:
virtual u16 allocateUnknownNodeId(const std::string &name);
virtual ISoundManager* getSoundManager();
virtual MtEventManager* getEventManager();
+ virtual IRollbackReportSink* getRollbackReportSink();
IWritableItemDefManager* getWritableItemDefManager();
IWritableNodeDefManager* getWritableNodeDefManager();
@@ -720,6 +731,10 @@ private:
// Bann checking
BanManager m_banmanager;
+ // Rollback manager (behind m_env_mutex)
+ IRollbackManager *m_rollback;
+ bool m_rollback_sink_enabled;
+
// Scripting
// Envlock and conlock should be locked when using Lua
lua_State *m_lua;
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-25 06:54:16 +0000