client/src/utils/gameStorage.js

   1 // Game object: {
   2 //   // Static informations:
   3 //   id: string
   4 //   vname: string,
   5 //   fenStart: string,
   6 //   players: array of sid+id+name,
   7 //   timeControl: string,
   8 //   increment: integer (seconds),
   9 //   mode: string ("live" or "corr")
  10 //   imported: boolean (optional, default false)
  11 //   // Game (dynamic) state:
  12 //   fen: string,
  13 //   moves: array of Move objects,
  14 //   clocks: array of integers,
  15 //   initime: array of integers (when clock start running),
  16 //   score: string (several options; '*' == running),
  17 // }
  18
  19 import { ajax } from "@/utils/ajax";
  20
  21 function dbOperation(callback)
  22 {
  23   let db = null;
  24   let DBOpenRequest = window.indexedDB.open("vchess", 4);
  25
  26   DBOpenRequest.onerror = function(event) {
  27     alert("Database error: " + event.target.errorCode);
  28   };
  29
  30   DBOpenRequest.onsuccess = function(event) {
  31     db = DBOpenRequest.result;
  32     callback(db);
  33     db.close();
  34   };
  35
  36   DBOpenRequest.onupgradeneeded = function(event) {
  37     let db = event.target.result;
  38     db.onerror = function(event) {
  39       alert("Error while loading database: " + event.target.errorCode);
  40     };
  41     // Create objectStore for vchess->games
  42     let objectStore = db.createObjectStore("games", { keyPath: "id" });
  43     objectStore.createIndex("score", "score"); //to search by game result
  44   }
  45 }
  46
  47 export const GameStorage =
  48 {
  49   // Optional callback to get error status
  50   // TODO: this func called from Hall seems to not work now...
  51   add: function(game, callback)
  52   {
  53     dbOperation((db) => {
  54       let transaction = db.transaction("games", "readwrite");
  55       if (callback)
  56       {
  57         transaction.oncomplete = function() {
  58           callback({}); //everything's fine
  59         }
  60         transaction.onerror = function() {
  61           callback({errmsg: "addGame failed: " + transaction.error});
  62         };
  63       }
  64       let objectStore = transaction.objectStore("games");
  65       objectStore.add(game);
  66     });
  67   },
  68
  69   // TODO: also option to takeback a move ?
  70   update: function(gameId, obj) //chat, move, fen, clocks, score, initime, ...
  71   {
  72     if (Number.isInteger(gameId) || !isNaN(parseInt(gameId)))
  73     {
  74       // corr: only move, fen and score
  75       ajax(
  76         "/games",
  77         "PUT",
  78         {
  79           gid: gameId,
  80           newObj:
  81           {
  82             chat: obj.chat,
  83             move: obj.move, //may be undefined...
  84             fen: obj.fen,
  85             score: obj.score,
  86             drawOffer: obj.drawOffer,
  87           }
  88         }
  89       );
  90     }
  91     else
  92     {
  93       // live
  94       dbOperation((db) => {
  95         let objectStore = db.transaction("games", "readwrite").objectStore("games");
  96         objectStore.get(gameId).onsuccess = function(event) {
  97           const game = event.target.result;
  98           Object.keys(obj).forEach(k => {
  99             if (k == "move")
 100               game.moves.push(obj[k]);
 101             else
 102               game[k] = obj[k];
 103           });
 104           objectStore.put(game); //save updated data
 105         }
 106       });
 107     }
 108   },
 109
 110   // Retrieve all local games (running, completed, imported...)
 111   getAll: function(callback)
 112   {
 113     dbOperation((db) => {
 114       let objectStore = db.transaction('games').objectStore('games');
 115       let games = [];
 116       objectStore.openCursor().onsuccess = function(event) {
 117         let cursor = event.target.result;
 118         // if there is still another cursor to go, keep running this code
 119         if (cursor)
 120         {
 121           games.push(cursor.value);
 122           cursor.continue();
 123         }
 124         else
 125           callback(games);
 126       }
 127     });
 128   },
 129
 130   // Retrieve any game from its identifiers (locally or on server)
 131   // NOTE: need callback because result is obtained asynchronously
 132   get: function(gameId, callback)
 133   {
 134     // corr games identifiers are integers
 135     if (Number.isInteger(gameId) || !isNaN(parseInt(gameId)))
 136     {
 137       ajax("/games", "GET", {gid:gameId}, res => {
 138         let game = res.game;
 139         game.moves.forEach(m => {
 140           m.squares = JSON.parse(m.squares);
 141         });
 142         callback(game);
 143       });
 144     }
 145     else //local game
 146     {
 147       dbOperation((db) => {
 148         let objectStore = db.transaction('games').objectStore('games');
 149         objectStore.get(gameId).onsuccess = function(event) {
 150           callback(event.target.result);
 151         }
 152       });
 153     }
 154   },
 155
 156   getCurrent: function(callback)
 157   {
 158     dbOperation((db) => {
 159       let objectStore = db.transaction('games').objectStore('games');
 160       objectStore.get("*").onsuccess = function(event) {
 161         callback(event.target.result);
 162       };
 163     });
 164   },
 165
 166   // Delete a game in indexedDB
 167   remove: function(gameId, callback)
 168   {
 169     dbOperation((db) => {
 170       let transaction = db.transaction(["games"], "readwrite");
 171       if (callback)
 172       {
 173         transaction.oncomplete = function() {
 174           callback({}); //everything's fine
 175         }
 176         transaction.onerror = function() {
 177           callback({errmsg: "removeGame failed: " + transaction.error});
 178         };
 179       }
 180       transaction.objectStore("games").delete(gameId);
 181     });
 182   },
 183 };