Menubar load monitor using AnyBar and node

cpu_monitor.js

console.log('Starting...');

var dgram = require('dgram');
var os = require('os');

// Create UDP client
var client = dgram.createSocket('udp4');

// Colors to use
var good = new Buffer('green');
var warn = new Buffer('yellow');
var bad = new Buffer('red');

// Interval to check load (in ms)
var checkInterval = 5000;

// Get the number of CPUs
// Assume hyperthreading so divide by 2 for actual number of CPUs
var cpuCount = os.cpus().length / 2;

console.log('CPU Count: %d', cpuCount);

// Calculate load limits
var loadGood = cpuCount * 0.8;
// Warns when load is greater than loadGood but less than this number
var loadWarn = cpuCount;

var checkLoad = function () {
  var load = os.loadavg();
  var color;

  console.log('Load: %s', load[0]);

  if (load[0] < loadGood) {
    color = good;
  } else if (load[0] < loadWarn) {
    color = warn;
  } else {
    color = bad;
  }
  // Send the color to AnyBar
  client.send(color, 0, color.length, 1738, 'localhost', function(err) {
    setTimeout(checkLoad, checkInterval);
  });
};

checkLoad();