SMUI - Simple Memory Usage Info

smui.js

/**

	SMUI:
		- Simple Memory Usage Info
	
	Dependencies:
		- pidusage (npm install pidusage --save )
		- eventemitter3 (npm install eventemitter3 --save)
		
	Thanks:
		- Primus & Soyuka @ GitHub
		- Bytes Formatting @ http://stackoverflow.com/a/18650828

**/

const SMUI = {};

SMUI.modules = {};

SMUI.modules.pidusage = require('pidusage');

SMUI.modules.EventEmitter = require('eventemitter3');

SMUI.formatBytes = function (bytes,decimals) {
	if(bytes == 0) return '0 Bytes';
	var k = 1000,
	dm = decimals + 1 || 3,
	sizes = ['Bytes', 'KB', 'MB', 'GB', 'TB', 'PB', 'EB', 'ZB', 'YB'],
	i = Math.floor(Math.log(bytes) / Math.log(k));
	return parseFloat((bytes / Math.pow(k, i)).toFixed(dm)) + ' ' + sizes[i];
};

SMUI.eventEmitter = new SMUI.modules.EventEmitter();

SMUI.startMonitoring = function(interval){
	var self = this;
	this.timer = setInterval(function(){
		self.modules.pidusage.stat(process.pid, function(err, stat){
			self.eventEmitter.emit('update', {
				raw: stat.memory,
				formatted: self.formatBytes(stat.memory, 1)
			});
		});
	}, interval);
};

SMUI.stopMonitoring = function(){
	clearInterval(this.timer);
	this.modules.pidusage.unmonitor(process.pid);
};

/** USAGE **/
SMUI.startMonitoring(500);

SMUI.eventEmitter.on('update', function (usage) {
	console.log(usage);
});

setTimeout(function(){
	SMUI.stopMonitoring();
}, 2000);