rollback.h

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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.
*/
 
#pragma once
 
#include <string>
#include "irr_v3d.h"
#include "rollback_interface.h"
#include <list>
#include <vector>
#include "sqlite3.h"
 
class IGameDef;
 
struct ActionRow;
struct Entity;
 
class RollbackManager: public IRollbackManager
{
public:
    RollbackManager(const std::string & world_path, IGameDef * gamedef);
    ~RollbackManager();
 
    void reportAction(const RollbackAction & action_);
    std::string getActor();
    bool isActorGuess();
    void setActor(const std::string & actor, bool is_guess);
    std::string getSuspect(v3s16 p, float nearness_shortcut,
            float min_nearness);
    void flush();
 
    void addAction(const RollbackAction & action);
    std::list<RollbackAction> getEntriesSince(time_t first_time);
    std::list<RollbackAction> getNodeActors(v3s16 pos, int range,
            time_t seconds, int limit);
    std::list<RollbackAction> getRevertActions(
            const std::string & actor_filter, time_t seconds);
 
private:
    void registerNewActor(const int id, const std::string & name);
    void registerNewNode(const int id, const std::string & name);
    int getActorId(const std::string & name);
    int getNodeId(const std::string & name);
    const char * getActorName(const int id);
    const char * getNodeName(const int id);
    bool createTables();
    bool initDatabase();
    bool registerRow(const ActionRow & row);
    const std::list<ActionRow> actionRowsFromSelect(sqlite3_stmt * stmt);
    ActionRow actionRowFromRollbackAction(const RollbackAction & action);
    const std::list<RollbackAction> rollbackActionsFromActionRows(
            const std::list<ActionRow> & rows);
    const std::list<ActionRow> getRowsSince(time_t firstTime,
            const std::string & actor);
    const std::list<ActionRow> getRowsSince_range(time_t firstTime, v3s16 p,
            int range, int limit);
    const std::list<RollbackAction> getActionsSince_range(time_t firstTime, v3s16 p,
            int range, int limit);
    const std::list<RollbackAction> getActionsSince(time_t firstTime,
            const std::string & actor = "");
    void migrate(const std::string & filepath);
    static float getSuspectNearness(bool is_guess, v3s16 suspect_p,
        time_t suspect_t, v3s16 action_p, time_t action_t);
 
 
    IGameDef *gamedef = nullptr;
 
    std::string current_actor;
    bool current_actor_is_guess = false;
 
    std::list<RollbackAction> action_todisk_buffer;
    std::list<RollbackAction> action_latest_buffer;
 
    std::string database_path;
    sqlite3 * db;
    sqlite3_stmt * stmt_insert;
    sqlite3_stmt * stmt_replace;
    sqlite3_stmt * stmt_select;
    sqlite3_stmt * stmt_select_range;
    sqlite3_stmt * stmt_select_withActor;
    sqlite3_stmt * stmt_knownActor_select;
    sqlite3_stmt * stmt_knownActor_insert;
    sqlite3_stmt * stmt_knownNode_select;
    sqlite3_stmt * stmt_knownNode_insert;
 
    std::vector<Entity> knownActors;
    std::vector<Entity> knownNodes;
};