src/rollback_interface.h

   1 /*
   2 Minetest-c55
   3 Copyright (C) 2012 celeron55, Perttu Ahola <celeron55@gmail.com>
   4
   5 This program is free software; you can redistribute it and/or modify
   6 it under the terms of the GNU Lesser General Public License as published by
   7 the Free Software Foundation; either version 2.1 of the License, or
   8 (at your option) any later version.
   9
  10 This program is distributed in the hope that it will be useful,
  11 but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 GNU Lesser General Public License for more details.
  14
  15 You should have received a copy of the GNU Lesser General Public License along
  16 with this program; if not, write to the Free Software Foundation, Inc.,
  17 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  18 */
  19
  20 #ifndef ROLLBACK_INTERFACE_HEADER
  21 #define ROLLBACK_INTERFACE_HEADER
  22
  23 #include "irr_v3d.h"
  24 #include <string>
  25 #include <iostream>
  26 #include "exceptions.h"
  27
  28 class Map;
  29 class IGameDef;
  30 struct MapNode;
  31 class InventoryManager;
  32
  33 struct RollbackNode
  34 {
  35         std::string name;
  36         int param1;
  37         int param2;
  38         std::string meta;
  39
  40         bool operator==(const RollbackNode &other)
  41         {
  42                 return (name == other.name && param1 == other.param1 &&
  43                                 param2 == other.param2 && meta == other.meta);
  44         }
  45         bool operator!=(const RollbackNode &other)
  46         {
  47                 return !(*this == other);
  48         }
  49
  50         RollbackNode():
  51                 param1(0),
  52                 param2(0)
  53         {}
  54
  55         RollbackNode(Map *map, v3s16 p, IGameDef *gamedef);
  56 };
  57
  58 struct RollbackAction
  59 {
  60         enum Type{
  61                 TYPE_NOTHING,
  62                 TYPE_SET_NODE,
  63                 TYPE_MODIFY_INVENTORY_STACK,
  64         } type;
  65
  66         int unix_time;
  67         std::string actor;
  68         bool actor_is_guess;
  69
  70         v3s16 p;
  71         RollbackNode n_old;
  72         RollbackNode n_new;
  73
  74         std::string inventory_location;
  75         std::string inventory_list;
  76         u32 inventory_index;
  77         bool inventory_add;
  78         std::string inventory_stack;
  79
  80         RollbackAction():
  81                 type(TYPE_NOTHING),
  82                 unix_time(0),
  83                 actor_is_guess(false)
  84         {}
  85
  86         void setSetNode(v3s16 p_, const RollbackNode &n_old_,
  87                         const RollbackNode &n_new_)
  88         {
  89                 type = TYPE_SET_NODE;
  90                 p = p_;
  91                 n_old = n_old_;
  92                 n_new = n_new_;
  93         }
  94
  95         void setModifyInventoryStack(const std::string &inventory_location_,
  96                         const std::string &inventory_list_, int index_,
  97                         bool add_, const std::string &inventory_stack_)
  98         {
  99                 type = TYPE_MODIFY_INVENTORY_STACK;
 100                 inventory_location = inventory_location_;
 101                 inventory_list = inventory_list_;
 102                 inventory_index = index_;
 103                 inventory_add = add_;
 104                 inventory_stack = inventory_stack_;
 105         }
 106
 107         // String should not contain newlines or nulls
 108         std::string toString() const;
 109         void fromStream(std::istream &is) throw(SerializationError);
 110
 111         // Eg. flowing water level changes are not important
 112         bool isImportant(IGameDef *gamedef) const;
 113
 114         bool getPosition(v3s16 *dst) const;
 115
 116         bool applyRevert(Map *map, InventoryManager *imgr, IGameDef *gamedef) const;
 117 };
 118
 119 class IRollbackReportSink
 120 {
 121 public:
 122         virtual ~IRollbackReportSink(){}
 123         virtual void reportAction(const RollbackAction &action) = 0;
 124         virtual std::string getActor() = 0;
 125         virtual bool isActorGuess() = 0;
 126         virtual void setActor(const std::string &actor, bool is_guess) = 0;
 127         // nearness_shortcut: 100 = same second, same node; 90 = 10s or 10 nodes
 128         virtual std::string getSuspect(v3s16 p, int max_time, float nearness_shortcut=98) = 0;
 129 };
 130
 131 class RollbackScopeActor
 132 {
 133 public:
 134         RollbackScopeActor(IRollbackReportSink *sink, const std::string &actor,
 135                         bool is_guess=false):
 136                 m_sink(sink)
 137         {
 138                 if(m_sink){
 139                         m_actor_was = m_sink->getActor();
 140                         m_actor_was_guess = m_sink->isActorGuess();
 141                         m_sink->setActor(actor, is_guess);
 142                 }
 143         }
 144         ~RollbackScopeActor()
 145         {
 146                 if(m_sink){
 147                         m_sink->setActor(m_actor_was, m_actor_was_guess);
 148                 }
 149         }
 150 private:
 151         IRollbackReportSink *m_sink;
 152         std::string m_actor_was;
 153         bool m_actor_was_guess;
 154 };
 155
 156 #endif