[localStorage 4 node] localStorage for node.js & io.js #nodejs #microlibrary

localStorage.js

/******************************************
 * localStorage API for Node.js and io.js *
 ******************************************
 * An implementation of the localStorage API for Node.JS and io.js. Currently untested.
 ******************************
 * Written by Starbeamrainbowlabs <https://starbeamrainbowlabs.com/>
 * I also wrote (and am upgrading!) Pepperminty Wiki: https://github.com/sbrl/pepperminty-wiki
 * 
 * Gist link: https://gist.github.com/sbrl/ad69f6b22c36a1d5bcfe
 * Posted to /r/tinycode here: (not posted yet!)
 */

function localStorage(filename)
{
	// Get a reference to the file system
	this.fs = require("fs");
	// Create an object to hold the localStorage
	this.data = {};
	
	// If there is already a file with the name provided to us then we should load & parse it
	if(this.fs.existsSync(filename))
		this.data = JSON.parse(this.fs.readFileSync(filename, "utf-8"));
	
	// Create a getter that returns the number of items that are currently in storage
	this.__defineGetter__("length", function() {
		return Object.keys(this.data).length;
	});
	
	// Save the filename for future reference
	this.filename = filename;
	// Whether we should automagically save changes made to the file system or not
	this.autoSave = true;
	
	// Gets an item from the localStorage
	this.getItem = function(key) {
		if(this.data.hasOwnProperty(key))
			return this.data[key];
		else
			return null;
	};
	// Saves an item to the localStorage
	this.setItem = function(key, value) {
		this.data[key] = value;
		if(this.autoSave) this.saveData();
	};
	// Removes the item stored at a given key from the localStorage
	this.removeItem = function(key) {
		var returnStatus = delete this.data[key];
		if(this.autoSave) this.saveData();
		return returnStatus;
	};
	// Clears the localStorage and deletes the associated 
	this.clear = function() {
		this.data = {};
		this.fs.unlink(this.filename);
	};
	// Whether we are curently saving to disk
	this.isSaving = false;
	// Saves the localStorage to disk
	this.saveData = function(key) {
		return new Promise((function(resolve, reject) {
			this.isSaving = true;
			this.fs.writeFileSync(this.filename, JSON.stringify(this.data), "utf-8", function(error) {
				this.isSaving = false;
				if(error) reject(error);
				
				resolve();
			});
		}).bind(this));
	};
}

localStorage.min.js

function localStorage(t){this.fs=require("fs"),this.data={},this.fs.existsSync(t)&&(this.data=JSON.parse(this.fs.readFileSync(t,"utf-8"))),this.__defineGetter__("length",function(){return Object.keys(this.data).length}),this.filename=t,this.autoSave=!0,this.getItem=function(t){return this.data.hasOwnProperty(t)?this.data[t]:null},this.setItem=function(t,i){this.data[t]=i,this.autoSave&&this.saveData()},this.removeItem=function(t){var i=delete this.data[t];return this.autoSave&&this.saveData(),i},this.clear=function(){this.data={},this.fs.unlink(this.filename)},this.isSaving=!1,this.saveData=function(){return new Promise(function(t,i){this.isSaving=!0,this.fs.writeFileSync(this.filename,JSON.stringify(this.data),"utf-8",function(s){this.isSaving=!1,s&&i(s),t()})}.bind(this))}}