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 //   cadence: string,
   8 //   increment: integer (seconds),
   9 //   type: string ("live" or "corr")
  10 //   // Game (dynamic) state:
  11 //   fen: string,
  12 //   moves: array of Move objects,
  13 //   clocks: array of integers,
  14 //   initime: array of integers (when clock start running),
  15 //   score: string (several options; '*' == running),
  16 // }
  17
  18 import { ajax } from "@/utils/ajax";
  19 import { store } from "@/store";
  20
  21 function dbOperation(callback) {
  22   let db = null;
  23   let DBOpenRequest = window.indexedDB.open("vchess", 4);
  24
  25   DBOpenRequest.onerror = function(event) {
  26     alert(store.state.tr["Database error: stop private browsing, or update your browser"]);
  27     callback("error",null);
  28   };
  29
  30   DBOpenRequest.onsuccess = function() {
  31     db = DBOpenRequest.result;
  32     callback(null,db);
  33     db.close();
  34   };
  35
  36   DBOpenRequest.onupgradeneeded = function(event) {
  37     let db = event.target.result;
  38     let objectStore = db.createObjectStore("games", { keyPath: "id" });
  39     objectStore.createIndex("score", "score"); //to search by game result
  40   };
  41 }
  42
  43 export const GameStorage = {
  44   // Optional callback to get error status
  45   add: function(game, callback) {
  46     dbOperation((err,db) => {
  47       if (err) {
  48         callback("error");
  49         return;
  50       }
  51       let transaction = db.transaction("games", "readwrite");
  52       transaction.oncomplete = function() {
  53         callback(); //everything's fine
  54       };
  55       let objectStore = transaction.objectStore("games");
  56       objectStore.add(game);
  57     });
  58   },
  59
  60   // TODO: also option to takeback a move ?
  61   // obj: chat, move, fen, clocks, score[Msg], initime, ...
  62   update: function(gameId, obj) {
  63     if (Number.isInteger(gameId) || !isNaN(parseInt(gameId))) {
  64       // corr: only move, fen and score
  65       ajax("/games", "PUT", {
  66         gid: gameId,
  67         newObj: {
  68           // Some fields may be undefined:
  69           chat: obj.chat,
  70           move: obj.move,
  71           fen: obj.fen,
  72           score: obj.score,
  73           scoreMsg: obj.scoreMsg,
  74           drawOffer: obj.drawOffer
  75         }
  76       });
  77     } else {
  78       // live
  79       dbOperation((err,db) => {
  80         let objectStore = db
  81           .transaction("games", "readwrite")
  82           .objectStore("games");
  83         objectStore.get(gameId).onsuccess = function(event) {
  84           // Ignoring error silently: shouldn't happen now. TODO?
  85           if (event.target.result) {
  86             const game = event.target.result;
  87             Object.keys(obj).forEach(k => {
  88               if (k == "move") game.moves.push(obj[k]);
  89               else game[k] = obj[k];
  90             });
  91             objectStore.put(game); //save updated data
  92           }
  93         };
  94       });
  95     }
  96   },
  97
  98   // Retrieve all local games (running, completed, imported...)
  99   getAll: function(callback) {
 100     dbOperation((err,db) => {
 101       let objectStore = db.transaction("games").objectStore("games");
 102       let games = [];
 103       objectStore.openCursor().onsuccess = function(event) {
 104         let cursor = event.target.result;
 105         // if there is still another cursor to go, keep running this code
 106         if (cursor) {
 107           games.push(cursor.value);
 108           cursor.continue();
 109         } else callback(games);
 110       };
 111     });
 112   },
 113
 114   // Retrieve any game from its identifiers (locally or on server)
 115   // NOTE: need callback because result is obtained asynchronously
 116   get: function(gameId, callback) {
 117     // corr games identifiers are integers
 118     if (Number.isInteger(gameId) || !isNaN(parseInt(gameId))) {
 119       ajax("/games", "GET", { gid: gameId }, res => {
 120         let game = res.game;
 121         game.moves.forEach(m => {
 122           m.squares = JSON.parse(m.squares);
 123         });
 124         callback(game);
 125       });
 126     }
 127     else {
 128       // Local game
 129       dbOperation((err,db) => {
 130         let objectStore = db.transaction("games").objectStore("games");
 131         objectStore.get(gameId).onsuccess = function(event) {
 132           if (event.target.result)
 133             callback(event.target.result);
 134         };
 135       });
 136     }
 137   },
 138
 139   // Delete a game in indexedDB
 140   remove: function(gameId, callback) {
 141     dbOperation((err,db) => {
 142       if (!err) {
 143         let transaction = db.transaction(["games"], "readwrite");
 144         transaction.oncomplete = function() {
 145           callback({}); //everything's fine
 146         };
 147         transaction.objectStore("games").delete(gameId);
 148       }
 149     });
 150   }
 151 };