server/models/Game.js

   1 var db = require("../utils/database");
   2
   3 /*
   4  * Structure table Games:
   5  *   id: game id (int)
   6  *   vid: integer (variant id)
   7  *   fenStart: varchar (initial position)
   8  *   fen: varchar (current position)
   9  *   timeControl: string
  10  *   score: varchar (result)
  11  *   created: datetime
  12  *
  13  * Structure table Players:
  14  *   gid: ref game id
  15  *   uid: ref user id
  16  *   color: character
  17  *
  18  * Structure table Moves:
  19  *   gid: ref game id
  20  *   squares: varchar (description)
  21  *   message: text
  22  *   played: datetime
  23  *   idx: integer
  24  */
  25
  26 const GameModel =
  27 {
  28     create: function(vid, fen, timeControl, players, cb)
  29     {
  30         db.serialize(function() {
  31             let query =
  32                 "INSERT INTO Games (vid, fenStart, fen, score, timeControl, created)"
  33         + " VALUES (" + vid + ",'" + fen + "','" + fen + "','*','"
  34         + timeControl + "'," + Date.now() + ")";
  35       db.run(query, function(err) {
  36         if (!!err)
  37           return cb(err);
  38         players.forEach((p,idx) => {
  39           const color = (idx==0 ? "w" : "b");
  40           query =
  41             "INSERT INTO Players VALUES " +
  42             "(" + this.lastID + "," + p.id + ",'" + color + "')";
  43           db.run(query);
  44         });
  45         cb(null, {gid: this.lastID});
  46             });
  47         });
  48     },
  49
  50     // TODO: queries here could be async, and wait for all to complete
  51     getOne: function(id, cb)
  52     {
  53         db.serialize(function() {
  54       // TODO: optimize queries?
  55             let query =
  56                 "SELECT g.id, g.vid, g.fen, g.fenStart, g.timeControl, g.score, " +
  57           "v.name AS vname " +
  58                 "FROM Games g " +
  59         "JOIN Variants v " +
  60         "  ON g.vid = v.id " +
  61                 "WHERE g.id = " + id;
  62             db.get(query, (err,gameInfo) => {
  63                 if (!!err)
  64                     return cb(err);
  65                 query =
  66                     "SELECT p.uid, p.color, u.name " +
  67                     "FROM Players p " +
  68           "JOIN Users u " +
  69           "  ON p.uid = u.id " +
  70                     "WHERE p.gid = " + id;
  71                 db.all(query, (err2,players) => {
  72                     if (!!err2)
  73                         return cb(err2);
  74                     query =
  75                         "SELECT squares, message, played, idx " +
  76                         "FROM Moves " +
  77                         "WHERE gid = " + id;
  78                     db.all(query, (err3,moves) => {
  79                         if (!!err3)
  80                             return cb(err3);
  81                         const game = Object.assign({},
  82               gameInfo,
  83                           {
  84                               players: players,
  85                               moves: moves
  86               }
  87             );
  88                         return cb(null, game);
  89                     });
  90                 });
  91             });
  92         });
  93     },
  94
  95     getByUser: function(uid, excluded, cb)
  96     {
  97         db.serialize(function() {
  98             // Next query is fine because a player appear at most once in a game
  99             const query =
 100                 "SELECT gid " +
 101                 "FROM Players " +
 102                 "WHERE uid " + (excluded ? "<>" : "=") + " " + uid;
 103             db.all(query, (err,gameIds) => {
 104                 if (!!err)
 105                     return cb(err);
 106         gameIds = gameIds || []; //might be empty
 107                 let gameArray = [];
 108                 for (let i=0; i<gameIds.length; i++)
 109                 {
 110                     GameModel.getOne(gameIds[i]["gid"], (err2,game) => {
 111                         if (!!err2)
 112                             return cb(err2);
 113                         gameArray.push(game);
 114                         // Call callback function only when gameArray is complete:
 115                         if (i == gameIds.length - 1)
 116                             return cb(null, gameArray);
 117                     });
 118                 }
 119             });
 120         });
 121     },
 122
 123   getPlayers: function(id, cb)
 124   {
 125     db.serialize(function() {
 126       const query =
 127         "SELECT id " +
 128         "FROM Players " +
 129         "WHERE gid = " + id;
 130       db.all(query, (err,players) => {
 131         return cb(err, players);
 132       });
 133     });
 134   },
 135
 136   // obj can have fields move, fen and/or score
 137   update: function(id, obj)
 138   {
 139         db.parallelize(function() {
 140       let query =
 141         "UPDATE Games " +
 142         "SET ";
 143       if (!!obj.fen)
 144         query += "fen = '" + obj.fen + "',";
 145       if (!!obj.score)
 146         query += "score = '" + obj.score + "',";
 147       query = query.slice(0,-1); //remove last comma
 148       query += " WHERE id = " + id;
 149       db.run(query);
 150       if (!!obj.move)
 151       {
 152         const m = obj.move;
 153         query =
 154           "INSERT INTO Moves (gid, squares, message, played, idx) VALUES " +
 155           "(" + id + ",'" + JSON.stringify(m.squares) + "','" + m.message +
 156             "'," + m.played + "," + m.idx + ")";
 157         db.run(query);
 158       }
 159     });
 160   },
 161
 162     remove: function(id)
 163     {
 164         db.parallelize(function() {
 165             let query =
 166                 "DELETE FROM Games " +
 167                 "WHERE id = " + id;
 168             db.run(query);
 169             query =
 170                 "DELETE FROM Players " +
 171                 "WHERE gid = " + id;
 172             db.run(query);
 173             query =
 174                 "DELETE FROM Moves " +
 175                 "WHERE gid = " + id;
 176             db.run(query);
 177         });
 178     },
 179
 180   cleanGamesDb: function()
 181   {
 182     const tsNow = Date.now();
 183     // 86400000 = 24 hours in milliseconds
 184     const day = 86400000;
 185     db.serialize(function() {
 186       let query =
 187         "SELECT id,score " +
 188         "FROM Games ";
 189       db.all(query, (err,games) => {
 190         games.forEach(g => {
 191           query =
 192             "SELECT max(played) AS lastMaj " +
 193             "FROM Moves " +
 194             "WHERE gid = " + g.id;
 195           db.get(query, (err2,updated) {
 196             if (!updated && tsNow - g.created > 7*day)
 197               return GameModel.remove(g.id);
 198             const lastMaj = updated.lastMaj;
 199             if (g.score != "*" && tsNow - lastMaj > 7*day ||
 200               g.score == "*" && tsNow - lastMaj > 91*day)
 201             {
 202               GameModel.remove(g.id);
 203             }
 204           });
 205         });
 206       });
 207     });
 208   },
 209 }
 210
 211 module.exports = GameModel;