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-rw-r--r--doc/lua_api.txt8
-rw-r--r--src/craftdef.cpp90
-rw-r--r--src/craftdef.h4
-rw-r--r--src/script/lua_api/l_craft.cpp76
-rw-r--r--src/script/lua_api/l_craft.h1
5 files changed, 178 insertions, 1 deletions
diff --git a/doc/lua_api.txt b/doc/lua_api.txt
index 297566068..a59a9c0f2 100644
--- a/doc/lua_api.txt
+++ b/doc/lua_api.txt
@@ -1847,6 +1847,14 @@ Call these functions only at load time!
* `minetest.register_craftitem(name, item definition)`
* `minetest.register_alias(name, convert_to)`
* `minetest.register_craft(recipe)`
+ * Check recipe table syntax for different types below.
+* `minetest.clear_craft(recipe)`
+ * Will erase existing craft based either on output item or on input recipe.
+ * Specify either output or input only. If you specify both, input will be ignored. For input use the same recipe table
+ syntax as for `minetest.register_craft(recipe)`. For output specify only the item, without a quantity.
+ * If no erase candidate could be found, Lua exception will be thrown.
+ * Warning! The type field ("shaped","cooking" or any other) will be ignored if the recipe
+ contains output. Erasing is then done independently from the crafting method.
* `minetest.register_ore(ore definition)`
* `minetest.register_decoration(decoration definition)`
* `minetest.override_item(name, redefinition)`
diff --git a/src/craftdef.cpp b/src/craftdef.cpp
index d3f1edaf9..45d3018a7 100644
--- a/src/craftdef.cpp
+++ b/src/craftdef.cpp
@@ -960,6 +960,96 @@ public:
return recipes;
}
+
+ virtual bool clearCraftRecipesByOutput(const CraftOutput &output, IGameDef *gamedef)
+ {
+ std::map<std::string, std::vector<CraftDefinition*> >::iterator vec_iter =
+ m_output_craft_definitions.find(output.item);
+
+ if (vec_iter == m_output_craft_definitions.end())
+ return false;
+
+ std::vector<CraftDefinition*> &vec = vec_iter->second;
+ for (std::vector<CraftDefinition*>::iterator i = vec.begin();
+ i != vec.end(); ++i) {
+ CraftDefinition *def = *i;
+ // Recipes are not yet hashed at this point
+ std::vector<CraftDefinition*> &unhashed_inputs_vec = m_craft_defs[(int) CRAFT_HASH_TYPE_UNHASHED][0];
+ std::vector<CraftDefinition*> new_vec_by_input;
+ /* We will preallocate necessary memory addresses, so we don't need to reallocate them later.
+ This would save us some performance. */
+ new_vec_by_input.reserve(unhashed_inputs_vec.size());
+ for (std::vector<CraftDefinition*>::iterator i2 = unhashed_inputs_vec.begin();
+ i2 != unhashed_inputs_vec.end(); ++i2) {
+ if (def != *i2) {
+ new_vec_by_input.push_back(*i2);
+ }
+ }
+ m_craft_defs[(int) CRAFT_HASH_TYPE_UNHASHED][0].swap(new_vec_by_input);
+ }
+ m_output_craft_definitions.erase(output.item);
+ return true;
+ }
+
+ virtual bool clearCraftRecipesByInput(CraftMethod craft_method, unsigned int craft_grid_width,
+ const std::vector<std::string> &recipe, IGameDef *gamedef)
+ {
+ bool all_empty = true;
+ for (std::vector<std::string>::size_type i = 0;
+ i < recipe.size(); i++) {
+ if (!recipe[i].empty()) {
+ all_empty = false;
+ break;
+ }
+ }
+ if (all_empty)
+ return false;
+
+ CraftInput input(craft_method, craft_grid_width, craftGetItems(recipe, gamedef));
+ // Recipes are not yet hashed at this point
+ std::vector<CraftDefinition*> &unhashed_inputs_vec = m_craft_defs[(int) CRAFT_HASH_TYPE_UNHASHED][0];
+ std::vector<CraftDefinition*> new_vec_by_input;
+ bool got_hit = false;
+ for (std::vector<CraftDefinition*>::size_type
+ i = unhashed_inputs_vec.size(); i > 0; i--) {
+ CraftDefinition *def = unhashed_inputs_vec[i - 1];
+ /* If the input doesn't match the recipe definition, this recipe definition later
+ will be added back in source map. */
+ if (!def->check(input, gamedef)) {
+ new_vec_by_input.push_back(def);
+ continue;
+ }
+ CraftOutput output = def->getOutput(input, gamedef);
+ got_hit = true;
+ std::map<std::string, std::vector<CraftDefinition*> >::iterator
+ vec_iter = m_output_craft_definitions.find(output.item);
+ if (vec_iter == m_output_craft_definitions.end())
+ continue;
+ std::vector<CraftDefinition*> &vec = vec_iter->second;
+ std::vector<CraftDefinition*> new_vec_by_output;
+ /* We will preallocate necessary memory addresses, so we don't need
+ to reallocate them later. This would save us some performance. */
+ new_vec_by_output.reserve(vec.size());
+ for (std::vector<CraftDefinition*>::iterator i = vec.begin();
+ i != vec.end(); ++i) {
+ /* If pointers from map by input and output are not same,
+ we will add 'CraftDefinition*' to a new vector. */
+ if (def != *i) {
+ /* Adding dereferenced iterator value (which are
+ 'CraftDefinition' reference) to a new vector. */
+ new_vec_by_output.push_back(*i);
+ }
+ }
+ // Swaps assigned to current key value with new vector for output map.
+ m_output_craft_definitions[output.item].swap(new_vec_by_output);
+ }
+ if (got_hit)
+ // Swaps value with new vector for input map.
+ m_craft_defs[(int) CRAFT_HASH_TYPE_UNHASHED][0].swap(new_vec_by_input);
+
+ return got_hit;
+ }
+
virtual std::string dump() const
{
std::ostringstream os(std::ios::binary);
diff --git a/src/craftdef.h b/src/craftdef.h
index cebb2d7ae..695ee0c2c 100644
--- a/src/craftdef.h
+++ b/src/craftdef.h
@@ -426,6 +426,10 @@ public:
virtual std::vector<CraftDefinition*> getCraftRecipes(CraftOutput &output,
IGameDef *gamedef, unsigned limit=0) const=0;
+ virtual bool clearCraftRecipesByOutput(const CraftOutput &output, IGameDef *gamedef) = 0;
+ virtual bool clearCraftRecipesByInput(CraftMethod craft_method,
+ unsigned int craft_grid_width, const std::vector<std::string> &recipe, IGameDef *gamedef) = 0;
+
// Print crafting recipes for debugging
virtual std::string dump() const=0;
diff --git a/src/script/lua_api/l_craft.cpp b/src/script/lua_api/l_craft.cpp
index 391a0133d..d135c689f 100644
--- a/src/script/lua_api/l_craft.cpp
+++ b/src/script/lua_api/l_craft.cpp
@@ -34,7 +34,6 @@ struct EnumString ModApiCraft::es_CraftMethod[] =
{0, NULL},
};
-
// helper for register_craft
bool ModApiCraft::readCraftRecipeShaped(lua_State *L, int index,
int &width, std::vector<std::string> &recipe)
@@ -281,6 +280,80 @@ int ModApiCraft::l_register_craft(lua_State *L)
return 0; /* number of results */
}
+// clear_craft({[output=item], [recipe={{item00,item10},{item01,item11}}])
+int ModApiCraft::l_clear_craft(lua_State *L)
+{
+ NO_MAP_LOCK_REQUIRED;
+ luaL_checktype(L, 1, LUA_TTABLE);
+ int table = 1;
+
+ // Get the writable craft definition manager from the server
+ IWritableCraftDefManager *craftdef =
+ getServer(L)->getWritableCraftDefManager();
+
+ std::string output = getstringfield_default(L, table, "output", "");
+ std::string type = getstringfield_default(L, table, "type", "shaped");
+ CraftOutput c_output(output, 0);
+ if (output != "") {
+ if (craftdef->clearCraftRecipesByOutput(c_output, getServer(L)))
+ return 0;
+ else
+ throw LuaError("No craft recipe known for output"
+ " (output=\"" + output + "\")");
+ }
+ std::vector<std::string> recipe;
+ int width = 0;
+ CraftMethod method = CRAFT_METHOD_NORMAL;
+ /*
+ CraftDefinitionShaped
+ */
+ if (type == "shaped") {
+ lua_getfield(L, table, "recipe");
+ if (lua_isnil(L, -1))
+ throw LuaError("Either output or recipe has to be defined");
+ if (!readCraftRecipeShaped(L, -1, width, recipe))
+ throw LuaError("Invalid crafting recipe");
+ }
+ /*
+ CraftDefinitionShapeless
+ */
+ else if (type == "shapeless") {
+ lua_getfield(L, table, "recipe");
+ if (lua_isnil(L, -1))
+ throw LuaError("Either output or recipe has to be defined");
+ if (!readCraftRecipeShapeless(L, -1, recipe))
+ throw LuaError("Invalid crafting recipe");
+ }
+ /*
+ CraftDefinitionCooking
+ */
+ else if (type == "cooking") {
+ method = CRAFT_METHOD_COOKING;
+ std::string rec = getstringfield_default(L, table, "recipe", "");
+ if (rec == "")
+ throw LuaError("Crafting definition (cooking)"
+ " is missing a recipe");
+ recipe.push_back(rec);
+ }
+ /*
+ CraftDefinitionFuel
+ */
+ else if (type == "fuel") {
+ method = CRAFT_METHOD_FUEL;
+ std::string rec = getstringfield_default(L, table, "recipe", "");
+ if (rec == "")
+ throw LuaError("Crafting definition (fuel)"
+ " is missing a recipe");
+ recipe.push_back(rec);
+ } else {
+ throw LuaError("Unknown crafting definition type: \"" + type + "\"");
+ }
+ if (!craftdef->clearCraftRecipesByInput(method, width, recipe, getServer(L)))
+ throw LuaError("No crafting specified for input");
+ lua_pop(L, 1);
+ return 0;
+}
+
// get_craft_result(input)
int ModApiCraft::l_get_craft_result(lua_State *L)
{
@@ -431,4 +504,5 @@ void ModApiCraft::Initialize(lua_State *L, int top)
API_FCT(get_craft_recipe);
API_FCT(get_craft_result);
API_FCT(register_craft);
+ API_FCT(clear_craft);
}
diff --git a/src/script/lua_api/l_craft.h b/src/script/lua_api/l_craft.h
index 548608776..eb2bce706 100644
--- a/src/script/lua_api/l_craft.h
+++ b/src/script/lua_api/l_craft.h
@@ -33,6 +33,7 @@ private:
static int l_get_craft_recipe(lua_State *L);
static int l_get_all_craft_recipes(lua_State *L);
static int l_get_craft_result(lua_State *L);
+ static int l_clear_craft(lua_State *L);
static bool readCraftReplacements(lua_State *L, int index,
CraftReplacements &replacements);
generated by cgit v1.2.3 (git 2.25.1) at 2024-10-05 19:12:34 +0000
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/*
Minetest
Copyright (C) 2013 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 "util/numeric.h"
#include "inventorymanager.h" // deserializing InventoryLocations
#include "sqlite3.h"
#include "filesys.h"

#define POINTS_PER_NODE (16.0)

#define SQLRES(f, good) \
	if ((f) != (good)) {\
		throw FileNotGoodException(std::string("RollbackManager: " \
			"SQLite3 error (" __FILE__ ":" TOSTRING(__LINE__) \
			"): ") + sqlite3_errmsg(db)); \
	}
#define SQLOK(f) SQLRES(f, SQLITE_OK)

#define SQLOK_ERRSTREAM(s, m)                             \
	if ((s) != SQLITE_OK) {                               \
		errorstream << "RollbackManager: " << (m) << ": " \
			<< sqlite3_errmsg(db) << std::endl;           \
	}

#define FINALIZE_STATEMENT(statement) \
	SQLOK_ERRSTREAM(sqlite3_finalize(statement), "Failed to finalize " #statement)

class ItemStackRow : public ItemStack {
public:
	ItemStackRow & operator = (const ItemStack & other)
	{
		*static_cast<ItemStack *>(this) = other;
		return *this;
	}

	int id;
};

struct ActionRow {
	int          id;
	int          actor;
	time_t       timestamp;
	int          type;
	std::string  location, list;
	int          index, add;
	ItemStackRow stack;
	int          nodeMeta;
	int          x, y, z;
	int          oldNode;
	int          oldParam1, oldParam2;
	std::string  oldMeta;
	int          newNode;
	int          newParam1, newParam2;
	std::string  newMeta;
	int          guessed;
};


struct Entity {
	int         id;
	std::string name;
};



RollbackManager::RollbackManager(const std::string & world_path,
		IGameDef * gamedef_) :
	gamedef(gamedef_)
{
	verbosestream << "RollbackManager::RollbackManager(" << world_path
		<< ")" << std::endl;

	std::string txt_filename = world_path + DIR_DELIM "rollback.txt";
	std::string migrating_flag = txt_filename + ".migrating";
	database_path = world_path + DIR_DELIM "rollback.sqlite";

	bool created = initDatabase();

	if (fs::PathExists(txt_filename) && (created ||
			fs::PathExists(migrating_flag))) {
		std::ofstream of(migrating_flag.c_str());
		of.close();
		migrate(txt_filename);
		fs::DeleteSingleFileOrEmptyDirectory(migrating_flag);
	}
}


RollbackManager::~RollbackManager()
{
	flush();

	FINALIZE_STATEMENT(stmt_insert);
	FINALIZE_STATEMENT(stmt_replace);
	FINALIZE_STATEMENT(stmt_select);
	FINALIZE_STATEMENT(stmt_select_range);
	FINALIZE_STATEMENT(stmt_select_withActor);
	FINALIZE_STATEMENT(stmt_knownActor_select);
	FINALIZE_STATEMENT(stmt_knownActor_insert);
	FINALIZE_STATEMENT(stmt_knownNode_select);
	FINALIZE_STATEMENT(stmt_knownNode_insert);

	SQLOK_ERRSTREAM(sqlite3_close(db), "Could not close db");
}


void RollbackManager::registerNewActor(const int id, const std::string &name)
{
	Entity actor = {id, name};
	knownActors.push_back(actor);
}


void RollbackManager::registerNewNode(const int id, const std::string &name)
{
	Entity node = {id, name};
	knownNodes.push_back(node);
}


int RollbackManager::getActorId(const std::string &name)
{
	for (std::vector<Entity>::const_iterator iter = knownActors.begin();
			iter != knownActors.end(); ++iter) {
		if (iter->name == name) {
			return iter->id;
		}
	}

	SQLOK(sqlite3_bind_text(stmt_knownActor_insert, 1, name.c_str(), name.size(), NULL));
	SQLRES(sqlite3_step(stmt_knownActor_insert), SQLITE_DONE);
	SQLOK(sqlite3_reset(stmt_knownActor_insert));

	int id = sqlite3_last_insert_rowid(db);
	registerNewActor(id, name);

	return id;
}


int RollbackManager::getNodeId(const std::string &name)
{
	for (std::vector<Entity>::const_iterator iter = knownNodes.begin();
			iter != knownNodes.end(); ++iter) {
		if (iter->name == name) {
			return iter->id;
		}
	}

	SQLOK(sqlite3_bind_text(stmt_knownNode_insert, 1, name.c_str(), name.size(), NULL));
	SQLRES(sqlite3_step(stmt_knownNode_insert), SQLITE_DONE);
	SQLOK(sqlite3_reset(stmt_knownNode_insert));

	int id = sqlite3_last_insert_rowid(db);
	registerNewNode(id, name);

	return id;
}


const char * RollbackManager::getActorName(const int id)
{
	for (std::vector<Entity>::const_iterator iter = knownActors.begin();
			iter != knownActors.end(); ++iter) {
		if (iter->id == id) {
			return iter->name.c_str();
		}
	}

	return "";
}


const char * RollbackManager::getNodeName(const int id)
{
	for (std::vector<Entity>::const_iterator iter = knownNodes.begin();
			iter != knownNodes.end(); ++iter) {
		if (iter->id == id) {
			return iter->name.c_str();
		}
	}

	return "";
}


bool RollbackManager::createTables()
{
	SQLOK(sqlite3_exec(db,
		"CREATE TABLE IF NOT EXISTS `actor` (\n"
		"	`id` INTEGER PRIMARY KEY AUTOINCREMENT NOT NULL,\n"
		"	`name` TEXT NOT NULL\n"
		");\n"
		"CREATE TABLE IF NOT EXISTS `node` (\n"
		"	`id` INTEGER PRIMARY KEY AUTOINCREMENT NOT NULL,\n"
		"	`name` TEXT NOT NULL\n"
		");\n"
		"CREATE TABLE IF NOT EXISTS `action` (\n"
		"	`id` INTEGER PRIMARY KEY AUTOINCREMENT,\n"
		"	`actor` INTEGER NOT NULL,\n"
		"	`timestamp` TIMESTAMP NOT NULL,\n"
		"	`type` INTEGER NOT NULL,\n"
		"	`list` TEXT,\n"
		"	`index` INTEGER,\n"
		"	`add` INTEGER,\n"
		"	`stackNode` INTEGER,\n"
		"	`stackQuantity` INTEGER,\n"
		"	`nodeMeta` INTEGER,\n"
		"	`x` INT,\n"
		"	`y` INT,\n"
		"	`z` INT,\n"
		"	`oldNode` INTEGER,\n"
		"	`oldParam1` INTEGER,\n"
		"	`oldParam2` INTEGER,\n"
		"	`oldMeta` TEXT,\n"
		"	`newNode` INTEGER,\n"
		"	`newParam1` INTEGER,\n"
		"	`newParam2` INTEGER,\n"
		"	`newMeta` TEXT,\n"
		"	`guessedActor` INTEGER,\n"
		"	FOREIGN KEY (`actor`) REFERENCES `actor`(`id`),\n"
		"	FOREIGN KEY (`stackNode`) REFERENCES `node`(`id`),\n"
		"	FOREIGN KEY (`oldNode`)   REFERENCES `node`(`id`),\n"
		"	FOREIGN KEY (`newNode`)   REFERENCES `node`(`id`)\n"
		");\n"
		"CREATE INDEX IF NOT EXISTS `actionIndex` ON `action`(`x`,`y`,`z`,`timestamp`,`actor`);\n",
		NULL, NULL, NULL));
	verbosestream << "SQL Rollback: SQLite3 database structure was created" << std::endl;

	return true;
}


bool RollbackManager::initDatabase()
{
	verbosestream << "RollbackManager: Database connection setup" << std::endl;

	bool needs_create = !fs::PathExists(database_path);
	SQLOK(sqlite3_open_v2(database_path.c_str(), &db,
			SQLITE_OPEN_READWRITE | SQLITE_OPEN_CREATE, NULL));

	if (needs_create) {
		createTables();
	}

	SQLOK(sqlite3_prepare_v2(db,
		"INSERT INTO `action` (\n"
		"	`actor`, `timestamp`, `type`,\n"
		"	`list`, `index`, `add`, `stackNode`, `stackQuantity`, `nodeMeta`,\n"
		"	`x`, `y`, `z`,\n"
		"	`oldNode`, `oldParam1`, `oldParam2`, `oldMeta`,\n"
		"	`newNode`, `newParam1`, `newParam2`, `newMeta`,\n"
		"	`guessedActor`\n"
		") VALUES (\n"
		"	?, ?, ?,\n"
		"	?, ?, ?, ?, ?, ?,\n"
		"	?, ?, ?,\n"
		"	?, ?, ?, ?,\n"
		"	?, ?, ?, ?,\n"
		"	?"
		");",
		-1, &stmt_insert, NULL));

	SQLOK(sqlite3_prepare_v2(db,
		"REPLACE INTO `action` (\n"
		"	`actor`, `timestamp`, `type`,\n"
		"	`list`, `index`, `add`, `stackNode`, `stackQuantity`, `nodeMeta`,\n"
		"	`x`, `y`, `z`,\n"
		"	`oldNode`, `oldParam1`, `oldParam2`, `oldMeta`,\n"
		"	`newNode`, `newParam1`, `newParam2`, `newMeta`,\n"
		"	`guessedActor`, `id`\n"
		") VALUES (\n"
		"	?, ?, ?,\n"
		"	?, ?, ?, ?, ?, ?,\n"
		"	?, ?, ?,\n"
		"	?, ?, ?, ?,\n"
		"	?, ?, ?, ?,\n"
		"	?, ?\n"
		");",
		-1, &stmt_replace, NULL));

	SQLOK(sqlite3_prepare_v2(db,
		"SELECT\n"
		"	`actor`, `timestamp`, `type`,\n"
		"	`list`, `index`, `add`, `stackNode`, `stackQuantity`, `nodemeta`,\n"
		"	`x`, `y`, `z`,\n"
		"	`oldNode`, `oldParam1`, `oldParam2`, `oldMeta`,\n"
		"	`newNode`, `newParam1`, `newParam2`, `newMeta`,\n"
		"	`guessedActor`\n"
		" FROM `action`\n"
		" WHERE `timestamp` >= ?\n"
		" ORDER BY `timestamp` DESC, `id` DESC",
		-1, &stmt_select, NULL));

	SQLOK(sqlite3_prepare_v2(db,
		"SELECT\n"
		"	`actor`, `timestamp`, `type`,\n"
		"	`list`, `index`, `add`, `stackNode`, `stackQuantity`, `nodemeta`,\n"
		"	`x`, `y`, `z`,\n"
		"	`oldNode`, `oldParam1`, `oldParam2`, `oldMeta`,\n"
		"	`newNode`, `newParam1`, `newParam2`, `newMeta`,\n"
		"	`guessedActor`\n"
		"FROM `action`\n"
		"WHERE `timestamp` >= ?\n"
		"	AND `x` IS NOT NULL\n"
		"	AND `y` IS NOT NULL\n"
		"	AND `z` IS NOT NULL\n"
		"	AND `x` BETWEEN ? AND ?\n"
		"	AND `y` BETWEEN ? AND ?\n"
		"	AND `z` BETWEEN ? AND ?\n"
		"ORDER BY `timestamp` DESC, `id` DESC\n"
		"LIMIT 0,?",
		-1, &stmt_select_range, NULL));

	SQLOK(sqlite3_prepare_v2(db,
		"SELECT\n"
		"	`actor`, `timestamp`, `type`,\n"
		"	`list`, `index`, `add`, `stackNode`, `stackQuantity`, `nodemeta`,\n"
		"	`x`, `y`, `z`,\n"
		"	`oldNode`, `oldParam1`, `oldParam2`, `oldMeta`,\n"
		"	`newNode`, `newParam1`, `newParam2`, `newMeta`,\n"
		"	`guessedActor`\n"
		"FROM `action`\n"
		"WHERE `timestamp` >= ?\n"
		"	AND `actor` = ?\n"
		"ORDER BY `timestamp` DESC, `id` DESC\n",
		-1, &stmt_select_withActor, NULL));

	SQLOK(sqlite3_prepare_v2(db, "SELECT `id`, `name` FROM `actor`",
			-1, &stmt_knownActor_select, NULL));

	SQLOK(sqlite3_prepare_v2(db, "INSERT INTO `actor` (`name`) VALUES (?)",
			-1, &stmt_knownActor_insert, NULL));

	SQLOK(sqlite3_prepare_v2(db, "SELECT `id`, `name` FROM `node`",
			-1, &stmt_knownNode_select, NULL));

	SQLOK(sqlite3_prepare_v2(db, "INSERT INTO `node` (`name`) VALUES (?)",
			-1, &stmt_knownNode_insert, NULL));

	verbosestream << "SQL prepared statements setup correctly" << std::endl;

	while (sqlite3_step(stmt_knownActor_select) == SQLITE_ROW) {
		registerNewActor(
		        sqlite3_column_int(stmt_knownActor_select, 0),
		        reinterpret_cast<const char *>(sqlite3_column_text(stmt_knownActor_select, 1))
		);
	}
	SQLOK(sqlite3_reset(stmt_knownActor_select));

	while (sqlite3_step(stmt_knownNode_select) == SQLITE_ROW) {
		registerNewNode(
		        sqlite3_column_int(stmt_knownNode_select, 0),
		        reinterpret_cast<const char *>(sqlite3_column_text(stmt_knownNode_select, 1))
		);
	}
	SQLOK(sqlite3_reset(stmt_knownNode_select));

	return needs_create;
}


bool RollbackManager::registerRow(const ActionRow & row)
{
	sqlite3_stmt * stmt_do = (row.id) ? stmt_replace : stmt_insert;

	bool nodeMeta = false;

	SQLOK(sqlite3_bind_int  (stmt_do, 1, row.actor));
	SQLOK(sqlite3_bind_int64(stmt_do, 2, row.timestamp));
	SQLOK(sqlite3_bind_int  (stmt_do, 3, row.type));

	if (row.type == RollbackAction::TYPE_MODIFY_INVENTORY_STACK) {
		const std::string & loc = row.location;
		nodeMeta = (loc.substr(0, 9) == "nodemeta:");

		SQLOK(sqlite3_bind_text(stmt_do, 4, row.list.c_str(), row.list.size(), NULL));
		SQLOK(sqlite3_bind_int (stmt_do, 5, row.index));
		SQLOK(sqlite3_bind_int (stmt_do, 6, row.add));
		SQLOK(sqlite3_bind_int (stmt_do, 7, row.stack.id));
		SQLOK(sqlite3_bind_int (stmt_do, 8, row.stack.count));
		SQLOK(sqlite3_bind_int (stmt_do, 9, (int) nodeMeta));

		if (nodeMeta) {
			std::string::size_type p1, p2;
			p1 = loc.find(':') + 1;
			p2 = loc.find(',');
			std::string x = loc.substr(p1, p2 - p1);
			p1 = p2 + 1;
			p2 = loc.find(',', p1);
			std::string y = loc.substr(p1, p2 - p1);
			std::string z = loc.substr(p2 + 1);
			SQLOK(sqlite3_bind_int(stmt_do, 10, atoi(x.c_str())));
			SQLOK(sqlite3_bind_int(stmt_do, 11, atoi(y.c_str())));
			SQLOK(sqlite3_bind_int(stmt_do, 12, atoi(z.c_str())));
		}
	} else {
		SQLOK(sqlite3_bind_null(stmt_do, 4));
		SQLOK(sqlite3_bind_null(stmt_do, 5));
		SQLOK(sqlite3_bind_null(stmt_do, 6));
		SQLOK(sqlite3_bind_null(stmt_do, 7));
		SQLOK(sqlite3_bind_null(stmt_do, 8));
		SQLOK(sqlite3_bind_null(stmt_do, 9));
	}

	if (row.type == RollbackAction::TYPE_SET_NODE) {
		SQLOK(sqlite3_bind_int (stmt_do, 10, row.x));
		SQLOK(sqlite3_bind_int (stmt_do, 11, row.y));