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 import { store } from "@/store";
  21
  22 function dbOperation(callback)
  23 {
  24   let db = null;
  25   let DBOpenRequest = window.indexedDB.open("vchess", 4);
  26
  27   DBOpenRequest.onerror = function(event) {
  28     alert(store.state.tr["Database error:"] + " " + event.target.errorCode);
  29   };
  30
  31   DBOpenRequest.onsuccess = function(event) {
  32     db = DBOpenRequest.result;
  33     callback(db);
  34     db.close();
  35   };
  36
  37   DBOpenRequest.onupgradeneeded = function(event) {
  38     let db = event.target.result;
  39     db.onerror = function(event) {
  40       alert(store.state.tr["Error while loading database:"] + " " + event.target.errorCode);
  41     };
  42     // Create objectStore for vchess->games
  43     let objectStore = db.createObjectStore("games", { keyPath: "id" });
  44     objectStore.createIndex("score", "score"); //to search by game result
  45   }
  46 }
  47
  48 export const GameStorage =
  49 {
  50   // Optional callback to get error status
  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: store.state.tr["Game retrieval 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   // obj: chat, move, fen, clocks, score[Msg], initime, ...
  71   update: function(gameId, obj)
  72   {
  73     if (Number.isInteger(gameId) || !isNaN(parseInt(gameId)))
  74     {
  75       // corr: only move, fen and score
  76       ajax(
  77         "/games",
  78         "PUT",
  79         {
  80           gid: gameId,
  81           newObj:
  82           {
  83             // Some fields may be undefined:
  84             chat: obj.chat,
  85             move: obj.move,
  86             fen: obj.fen,
  87             score: obj.score,
  88             scoreMsg: obj.scoreMsg,
  89             drawOffer: obj.drawOffer,
  90           }
  91         }
  92       );
  93     }
  94     else
  95     {
  96       // live
  97       dbOperation((db) => {
  98         let objectStore = db.transaction("games", "readwrite").objectStore("games");
  99         objectStore.get(gameId).onsuccess = function(event) {
 100           const game = event.target.result;
 101           Object.keys(obj).forEach(k => {
 102             if (k == "move")
 103               game.moves.push(obj[k]);
 104             else
 105               game[k] = obj[k];
 106           });
 107           objectStore.put(game); //save updated data
 108         }
 109       });
 110     }
 111   },
 112
 113   // Retrieve all local games (running, completed, imported...)
 114   getAll: function(callback)
 115   {
 116     dbOperation((db) => {
 117       let objectStore = db.transaction('games').objectStore('games');
 118       let games = [];
 119       objectStore.openCursor().onsuccess = function(event) {
 120         let cursor = event.target.result;
 121         // if there is still another cursor to go, keep running this code
 122         if (cursor)
 123         {
 124           games.push(cursor.value);
 125           cursor.continue();
 126         }
 127         else
 128           callback(games);
 129       }
 130     });
 131   },
 132
 133   // Retrieve any game from its identifiers (locally or on server)
 134   // NOTE: need callback because result is obtained asynchronously
 135   get: function(gameId, callback)
 136   {
 137     // corr games identifiers are integers
 138     if (Number.isInteger(gameId) || !isNaN(parseInt(gameId)))
 139     {
 140       ajax("/games", "GET", {gid:gameId}, res => {
 141         let game = res.game;
 142         game.moves.forEach(m => {
 143           m.squares = JSON.parse(m.squares);
 144         });
 145         callback(game);
 146       });
 147     }
 148     else //local game
 149     {
 150       dbOperation((db) => {
 151         let objectStore = db.transaction('games').objectStore('games');
 152         objectStore.get(gameId).onsuccess = function(event) {
 153           callback(event.target.result);
 154         }
 155       });
 156     }
 157   },
 158
 159   getCurrent: function(callback)
 160   {
 161     dbOperation((db) => {
 162       let objectStore = db.transaction('games').objectStore('games');
 163       objectStore.get("*").onsuccess = function(event) {
 164         callback(event.target.result);
 165       };
 166     });
 167   },
 168
 169   // Delete a game in indexedDB
 170   remove: function(gameId, callback)
 171   {
 172     dbOperation((db) => {
 173       let transaction = db.transaction(["games"], "readwrite");
 174       if (callback)
 175       {
 176         transaction.oncomplete = function() {
 177           callback({}); //everything's fine
 178         }
 179         transaction.onerror = function() {
 180           callback({errmsg: store.state.tr["Game removal failed:"] + " " + transaction.error});
 181         };
 182       }
 183       transaction.objectStore("games").delete(gameId);
 184     });
 185   },
 186 };