client/src/utils/gameStorage.js

   1 // Game object: {
   2 //   // Static informations:
   3 //   gameId: 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: "gameId" });
  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   // NOTE: for live games only (all on server for corr)
  71   update: function(gameId, obj) //colorIdx, nextIdx, move, fen, addTime, score
  72   {
  73     dbOperation((db) => {
  74       let objectStore = db.transaction("games", "readwrite").objectStore("games");
  75       objectStore.get(gameId).onsuccess = function(event) {
  76         const game = event.target.result;
  77         if (!!obj.move)
  78         {
  79           game.moves.push(obj.move);
  80           game.fen = obj.fen;
  81           game.clocks[obj.colorIdx] += obj.addTime;
  82           game.initime[obj.nextIdx] = Date.now();
  83         }
  84         if (!!obj.score)
  85           game.score = obj.score;
  86         objectStore.put(game); //save updated data
  87       }
  88     });
  89   },
  90
  91   // Retrieve all local games (running, completed, imported...)
  92   getAll: function(callback)
  93   {
  94     dbOperation((db) => {
  95       let objectStore = db.transaction('games').objectStore('games');
  96       let games = [];
  97       objectStore.openCursor().onsuccess = function(event) {
  98         let cursor = event.target.result;
  99         // if there is still another cursor to go, keep running this code
 100         if (cursor)
 101         {
 102           games.push(cursor.value);
 103           cursor.continue();
 104         }
 105         else
 106           callback(games);
 107       }
 108     });
 109   },
 110
 111   // Retrieve any game from its identifiers (locally or on server)
 112   // NOTE: need callback because result is obtained asynchronously
 113   get: function(gameId, callback)
 114   {
 115     // corr games identifiers are integers
 116     if (Number.isInteger(gameId) || !isNaN(parseInt(gameId)))
 117     {
 118       ajax("/games", "GET", {gid:gameId}, res => {
 119         callback(res.game);
 120       });
 121     }
 122     else //local game
 123     {
 124       dbOperation((db) => {
 125         let objectStore = db.transaction('games').objectStore('games');
 126         objectStore.get(gameId).onsuccess = function(event) {
 127           callback(event.target.result);
 128         }
 129       });
 130     }
 131   },
 132
 133   getCurrent: function(callback)
 134   {
 135     dbOperation((db) => {
 136       let objectStore = db.transaction('games').objectStore('games');
 137       objectStore.get("*").onsuccess = function(event) {
 138         callback(event.target.result);
 139       };
 140     });
 141   },
 142
 143   // Delete a game in indexedDB
 144   remove: function(gameId, callback)
 145   {
 146     dbOperation((db) => {
 147       let transaction = db.transaction(["games"], "readwrite");
 148       if (callback)
 149       {
 150         transaction.oncomplete = function() {
 151           callback({}); //everything's fine
 152         }
 153         transaction.onerror = function() {
 154           callback({errmsg: "removeGame failed: " + transaction.error});
 155         };
 156       }
 157       transaction.objectStore("games").delete(gameId);
 158     });
 159   },
 160 };