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