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     let upgradeTransaction = event.target.transaction;
  31     if (!db.objectStoreNames.contains("compgames"))
  32       db.createObjectStore("compgames", { keyPath: "vname" });
  33     else
  34       upgradeTransaction.objectStore("compgames");
  35   };
  36 }
  37
  38 export const CompgameStorage = {
  39   add: function(game) {
  40     dbOperation((err,db) => {
  41       if (err) return;
  42       let objectStore = db
  43         .transaction("compgames", "readwrite")
  44         .objectStore("compgames");
  45       objectStore.add(game);
  46     });
  47   },
  48
  49   // obj: move and/or fen
  50   update: function(gameId, obj) {
  51     dbOperation((err,db) => {
  52       let objectStore = db
  53         .transaction("compgames", "readwrite")
  54         .objectStore("compgames");
  55       objectStore.get(gameId).onsuccess = function(event) {
  56         // Ignoring error silently: shouldn't happen now. TODO?
  57         if (event.target.result) {
  58           const game = event.target.result;
  59           Object.keys(obj).forEach(k => {
  60             if (k == "move") game.moves.push(obj[k]);
  61             else game[k] = obj[k];
  62           });
  63           objectStore.put(game); //save updated data
  64         }
  65       };
  66     });
  67   },
  68
  69   // Retrieve any game from its identifier (variant name)
  70   // NOTE: need callback because result is obtained asynchronously
  71   get: function(gameId, callback) {
  72     dbOperation((err,db) => {
  73       let objectStore = db
  74         .transaction("compgames", "readonly")
  75         .objectStore("compgames");
  76       objectStore.get(gameId).onsuccess = function(event) {
  77         callback(event.target.result);
  78       };
  79     });
  80   },
  81
  82   // Delete a game in indexedDB
  83   remove: function(gameId) {
  84     dbOperation((err,db) => {
  85       if (!err) {
  86         db.transaction("compgames", "readwrite")
  87           .objectStore("compgames")
  88           .delete(gameId);
  89       }
  90     });
  91   }
  92 };