node-haxball/examples/libraries/localStorage.js

The most powerful and lightweight API that allows you to develop your original Haxball(www.haxball.com) host, client, and standalone applications both on node.js and browser environments and also includes every possible hack and functionality that you can

module.exports = function(API){
  const { OperationType, VariableType, ConnectionState, AllowFlags, Direction, CollisionFlags, CameraFollow, BackgroundType, GamePlayState, BanEntryType, Callback, Utils, Room, Replay, Query, Library, RoomConfig, Plugin, Renderer, Errors, Language, EventFactory, Impl } = API;

  Object.setPrototypeOf(this, Library.prototype);
  Library.call(this, "localStorage", { // "localStorage" is library's name. Every library should have a unique name.
    version: 0.1,
    author: "abc",
    description: `This is a library that implements the "default storage interface"(?) using the browser's localStorage object. This library would not directly work in node.js.`
  });

  this.defineVariable({
    name: "active",
    description: "Storage is active?",
    type: VariableType.Boolean,
    value: true
  });

  this.defineVariable({
    name: "mainKey",
    description: "The main key that will contain all inner keys in browser's local storage.",
    type: VariableType.String,
    value: "localStorageLib_main"
  });

  var thisLibrary = this, memoryObj = null;

  this.initialize = function(){
    try{
      memoryObj = JSON.parse(window.localStorage.getItem(thisLibrary.mainKey)) || {};
    }catch(e){
      memoryObj = {};
    }
  };

  this.finalize = function(){
    memoryObj = null;
  };

  this.get = function(key){
    return memoryObj[key];
  };

  this.set = function(key, value){
    if (!thisLibrary.active)
      return;
    memoryObj[key] = value;
    window.localStorage.setItem(thisLibrary.mainKey, JSON.stringify(memoryObj));
  };
};