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   update: function(gameId, obj) //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             move: obj.move, //may be undefined...
  83             fen: obj.fen,
  84             score: obj.score,
  85           }
  86         }
  87       );
  88     }
  89     else
  90     {
  91       // live
  92       dbOperation((db) => {
  93         let objectStore = db.transaction("games", "readwrite").objectStore("games");
  94         objectStore.get(gameId).onsuccess = function(event) {
  95           const game = event.target.result;
  96           Object.keys(obj).forEach(k => {
  97             if (k == "move")
  98               game.moves.push(obj[k]);
  99             else
 100               game[k] = obj[k];
 101           });
 102           objectStore.put(game); //save updated data
 103         }
 104       });
 105     }
 106   },
 107
 108   // Retrieve all local games (running, completed, imported...)
 109   getAll: function(callback)
 110   {
 111     dbOperation((db) => {
 112       let objectStore = db.transaction('games').objectStore('games');
 113       let games = [];
 114       objectStore.openCursor().onsuccess = function(event) {
 115         let cursor = event.target.result;
 116         // if there is still another cursor to go, keep running this code
 117         if (cursor)
 118         {
 119           games.push(cursor.value);
 120           cursor.continue();
 121         }
 122         else
 123           callback(games);
 124       }
 125     });
 126   },
 127
 128   // Retrieve any game from its identifiers (locally or on server)
 129   // NOTE: need callback because result is obtained asynchronously
 130   get: function(gameId, callback)
 131   {
 132     // corr games identifiers are integers
 133     if (Number.isInteger(gameId) || !isNaN(parseInt(gameId)))
 134     {
 135       ajax("/games", "GET", {gid:gameId}, res => {
 136         callback(res.game);
 137       });
 138     }
 139     else //local game
 140     {
 141       dbOperation((db) => {
 142         let objectStore = db.transaction('games').objectStore('games');
 143         objectStore.get(gameId).onsuccess = function(event) {
 144           callback(event.target.result);
 145         }
 146       });
 147     }
 148   },
 149
 150   getCurrent: function(callback)
 151   {
 152     dbOperation((db) => {
 153       let objectStore = db.transaction('games').objectStore('games');
 154       objectStore.get("*").onsuccess = function(event) {
 155         callback(event.target.result);
 156       };
 157     });
 158   },
 159
 160   // Delete a game in indexedDB
 161   remove: function(gameId, callback)
 162   {
 163     dbOperation((db) => {
 164       let transaction = db.transaction(["games"], "readwrite");
 165       if (callback)
 166       {
 167         transaction.oncomplete = function() {
 168           callback({}); //everything's fine
 169         }
 170         transaction.onerror = function() {
 171           callback({errmsg: "removeGame failed: " + transaction.error});
 172         };
 173       }
 174       transaction.objectStore("games").delete(gameId);
 175     });
 176   },
 177 };