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             // TODO: I think stringify isn't requuired here (see ajax() )
  83             move: JSON.stringify(obj.move), //may be undefined...
  84             fen: obj.fen,
  85             score: obj.score,
  86           }
  87         }
  88       );
  89     }
  90     else
  91     {
  92       // live
  93       dbOperation((db) => {
  94         let objectStore = db.transaction("games", "readwrite").objectStore("games");
  95         objectStore.get(gameId).onsuccess = function(event) {
  96           const game = event.target.result;
  97           Object.keys(obj).forEach(k => {
  98             if (k == "move")
  99               game.moves.push(obj[k]);
 100             else
 101               game[k] = obj[k];
 102           });
 103           objectStore.put(game); //save updated data
 104         }
 105       });
 106     }
 107   },
 108
 109   // Retrieve all local games (running, completed, imported...)
 110   getAll: function(callback)
 111   {
 112     dbOperation((db) => {
 113       let objectStore = db.transaction('games').objectStore('games');
 114       let games = [];
 115       objectStore.openCursor().onsuccess = function(event) {
 116         let cursor = event.target.result;
 117         // if there is still another cursor to go, keep running this code
 118         if (cursor)
 119         {
 120           games.push(cursor.value);
 121           cursor.continue();
 122         }
 123         else
 124           callback(games);
 125       }
 126     });
 127   },
 128
 129   // Retrieve any game from its identifiers (locally or on server)
 130   // NOTE: need callback because result is obtained asynchronously
 131   get: function(gameId, callback)
 132   {
 133     // corr games identifiers are integers
 134     if (Number.isInteger(gameId) || !isNaN(parseInt(gameId)))
 135     {
 136       ajax("/games", "GET", {gid:gameId}, res => {
 137         callback(res.game);
 138       });
 139     }
 140     else //local game
 141     {
 142       dbOperation((db) => {
 143         let objectStore = db.transaction('games').objectStore('games');
 144         objectStore.get(gameId).onsuccess = function(event) {
 145           callback(event.target.result);
 146         }
 147       });
 148     }
 149   },
 150
 151   getCurrent: function(callback)
 152   {
 153     dbOperation((db) => {
 154       let objectStore = db.transaction('games').objectStore('games');
 155       objectStore.get("*").onsuccess = function(event) {
 156         callback(event.target.result);
 157       };
 158     });
 159   },
 160
 161   // Delete a game in indexedDB
 162   remove: function(gameId, callback)
 163   {
 164     dbOperation((db) => {
 165       let transaction = db.transaction(["games"], "readwrite");
 166       if (callback)
 167       {
 168         transaction.oncomplete = function() {
 169           callback({}); //everything's fine
 170         }
 171         transaction.onerror = function() {
 172           callback({errmsg: "removeGame failed: " + transaction.error});
 173         };
 174       }
 175       transaction.objectStore("games").delete(gameId);
 176     });
 177   },
 178 };