Simple Metrics Server for Node-Measure

metricsServer.js

var config = require('../config/config');
var http  = require('http');
var Measured = require('measured');

module.exports = (function(){
  var metricsServer = {

    // Create default collection of collections
    collections : {
      gauges: new Measured.createCollection('gauges'),
      counters: new Measured.createCollection('counters'),
      histograms: new Measured.createCollection('histograms'),
      meters: new Measured.createCollection('meters'),
      timers: new Measured.createCollection('timers'),

      // Helper method to get back json from this collection
      toJSON: function(){
        var res = {};
        for (var prop in this){
          if(this.hasOwnProperty(prop) && typeof(this[prop]) !== 'function'){
            res[prop] = this[prop].toJSON()[prop];
          }
        }
        return res;
      }
    },

    // Create a server for metrics
    server : http.createServer(function(req, res) {
      res.writeHead(200, {"Content-Type": "application/json"});
      res.end(JSON.stringify(metricsServer.collections.toJSON()));
    }).listen(config.metrics.port || 9091),

    // Helper method to make adding metrics to parent collections easy
    addToCollection: function(collectionName, metricName, metric){
      if(!this.collections[collectionName]){
        throw new Error('No Collection Regestered to that name');
      }
      return this.collections[collectionName].register(metricName, metric);
    }
  };

  // return metricsServer object;
  return metricsServer;
})();