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  *   color: character
  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) VALUES " +
  33         "(" + vid + ",'" + fen + "','" + fen + "','*','" + timeControl + "')";
  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, color " +
  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.run(query, (err,gameIds) => {
 103                 if (!!err)
 104                     return cb(err);
 105         gameIds = gameIds || []; //might be empty
 106                 let gameArray = [];
 107                 gameIds.forEach(gidRow => {
 108                     GameModel.getOne(gidRow["gid"], (err2,game) => {
 109                         if (!!err2)
 110                             return cb(err2);
 111                         gameArray.push(game);
 112                     });
 113                 });
 114                 return cb(null, gameArray);
 115             });
 116         });
 117     },
 118
 119   getPlayers: function(id, cb)
 120   {
 121     db.serialize(function() {
 122       const query =
 123         "SELECT id " +
 124         "FROM Players " +
 125         "WHERE gid = " + id;
 126       db.all(query, (err,players) => {
 127         return cb(err, players);
 128       });
 129     });
 130   },
 131
 132   // obj can have fields move, fen and/or score
 133   update: function(id, obj)
 134   {
 135         db.parallelize(function() {
 136       let query =
 137         "UPDATE Games " +
 138         "SET ";
 139       if (!!obj.fen)
 140         query += "fen = '" + obj.fen + "',";
 141       if (!!obj.score)
 142         query += "score = '" + obj.score + "',";
 143       query = query.slice(0,-1); //remove last comma
 144       query += " WHERE id = " + id;
 145       db.run(query);
 146       if (!!obj.move)
 147       {
 148         const m = obj.move;
 149         query =
 150           "INSERT INTO Moves (gid,squares,message,played,idx,color) VALUES " +
 151           "(" + id + ",'" + JSON.stringify(m.squares) + "','" + m.message +
 152             "'," + m.played + "," + m.idx + ",'" + m.color + "')";
 153         db.run(query);
 154       }
 155     });
 156   },
 157
 158     remove: function(id)
 159     {
 160         db.parallelize(function() {
 161             let query =
 162                 "DELETE FROM Games " +
 163                 "WHERE id = " + id;
 164             db.run(query);
 165             query =
 166                 "DELETE FROM Players " +
 167                 "WHERE gid = " + id;
 168             db.run(query);
 169             query =
 170                 "DELETE FROM Moves " +
 171                 "WHERE gid = " + id;
 172             db.run(query);
 173         });
 174     },
 175 }
 176
 177 module.exports = GameModel;