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