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[
  19       "Database error: stop private browsing, or update your browser"]);
  20     callback("error", null);
  21   };
  22
  23   DBOpenRequest.onsuccess = function(event) {
  24     db = DBOpenRequest.result;
  25     callback(null, db);
  26     db.close();
  27   };
  28
  29   DBOpenRequest.onupgradeneeded = function(event) {
  30     let db = event.target.result;
  31     let upgradeTransaction = event.target.transaction;
  32     if (!db.objectStoreNames.contains("compgames"))
  33       db.createObjectStore("compgames", { keyPath: "vname" });
  34     else
  35       upgradeTransaction.objectStore("compgames");
  36   };
  37 }
  38
  39 export const CompgameStorage = {
  40
  41   add: function(game) {
  42     dbOperation((err, db) => {
  43       if (err) return;
  44       let objectStore = db
  45         .transaction("compgames", "readwrite")
  46         .objectStore("compgames");
  47       objectStore.add(game);
  48     });
  49   },
  50
  51   // obj: move and/or fen
  52   update: function(gameId, obj) {
  53     dbOperation((err, db) => {
  54       let objectStore = db
  55         .transaction("compgames", "readwrite")
  56         .objectStore("compgames");
  57       objectStore.get(gameId).onsuccess = function(event) {
  58         // Ignoring error silently: shouldn't happen now. TODO?
  59         if (!!event.target.result) {
  60           const game = event.target.result;
  61           Object.keys(obj).forEach(k => {
  62             if (k == "move") game.moves.push(obj[k]);
  63             else game[k] = obj[k];
  64           });
  65           objectStore.put(game); //save updated data
  66         }
  67       };
  68     });
  69   },
  70
  71   // Retrieve any game from its identifier (variant name)
  72   // NOTE: need callback because result is obtained asynchronously
  73   get: function(gameId, callback) {
  74     dbOperation((err, db) => {
  75       let objectStore = db
  76         .transaction("compgames", "readonly")
  77         .objectStore("compgames");
  78       objectStore.get(gameId).onsuccess = function(event) {
  79         callback(event.target.result);
  80       };
  81     });
  82   },
  83
  84   // Delete a game in indexedDB
  85   remove: function(gameId) {
  86     dbOperation((err, db) => {
  87       if (!err) {
  88         db.transaction("compgames", "readwrite")
  89           .objectStore("compgames")
  90           .delete(gameId);
  91       }
  92     });
  93   }
  94
  95 };