client/src/utils/compgameStorage.js

   1 // (Comp)Game object: {
   2 //   // Static informations:
   3 //   vname: string (this is the ID)
   4 //   fenStart: string,
   5 //   mycolor: "w" or "b"
   6 //   // Game (dynamic) state:
   7 //   fen: string,
   8 //   moves: array of Move objects,
   9 // }
  10
  11 import { store } from "@/store";
  12
  13 function dbOperation(callback) {
  14   let db = null;
  15   let DBOpenRequest = window.indexedDB.open("vchess_comp", 4);
  16
  17   DBOpenRequest.onerror = function(event) {
  18     alert(store.state.tr["Database error: stop private browsing, or update your browser"]);
  19     callback("error", null);
  20   };
  21
  22   DBOpenRequest.onsuccess = function(event) {
  23     db = DBOpenRequest.result;
  24     callback(null, db);
  25     db.close();
  26   };
  27
  28   DBOpenRequest.onupgradeneeded = function(event) {
  29     let db = event.target.result;
  30     db.createObjectStore("compgames", { keyPath: "vname" });
  31   };
  32 }
  33
  34 export const CompgameStorage = {
  35   add: function(game) {
  36     dbOperation((err,db) => {
  37       if (err) return;
  38       let objectStore = db
  39         .transaction("compgames", "readwrite")
  40         .objectStore("compgames");
  41       objectStore.add(game);
  42     });
  43   },
  44
  45   // obj: move and/or fen
  46   update: function(gameId, obj) {
  47     dbOperation((err,db) => {
  48       let objectStore = db
  49         .transaction("compgames", "readwrite")
  50         .objectStore("compgames");
  51       objectStore.get(gameId).onsuccess = function(event) {
  52         // Ignoring error silently: shouldn't happen now. TODO?
  53         if (event.target.result) {
  54           const game = event.target.result;
  55           Object.keys(obj).forEach(k => {
  56             if (k == "move") game.moves.push(obj[k]);
  57             else game[k] = obj[k];
  58           });
  59           objectStore.put(game); //save updated data
  60         }
  61       };
  62     });
  63   },
  64
  65   // Retrieve any game from its identifier (variant name)
  66   // NOTE: need callback because result is obtained asynchronously
  67   get: function(gameId, callback) {
  68     dbOperation((err,db) => {
  69       let objectStore = db
  70         .transaction("compgames", "readonly")
  71         .objectStore("compgames");
  72       objectStore.get(gameId).onsuccess = function(event) {
  73         callback(event.target.result);
  74       };
  75     });
  76   },
  77
  78   // Delete a game in indexedDB
  79   remove: function(gameId) {
  80     dbOperation((err,db) => {
  81       if (!err) {
  82         db.transaction("compgames", "readwrite")
  83           .objectStore("compgames")
  84           .delete(gameId);
  85       }
  86     });
  87   }
  88 };