server/stats.js

   1 module.exports = {
   2     incr: function incr(stat_name, data) {
   3         global.modules.emit('stat counter', {name: stat_name, data: data});
   4     },
   5
   6     gauge: function gauge(stat_name, value) {
   7         global.modules.emit('stat gauge', {name: stat_name, value: value});
   8     },
   9
  10
  11     /**
  12      * Send a timer value to the stats
  13      *
  14      * Usage:
  15      *     var timer = Stats.startTimer('stat_name', {some_data: 'value'});
  16      *     // Do stuff
  17      *     timer.stop({other_data: 'value'});
  18      *
  19      * The object passed into .startTimer() and .stop(); are optional. If
  20      * given they will be shallow merged with .stop() overridding .startTimer()
  21      */
  22     startTimer: function statsTimer(stat_name, data_start) {
  23         var timer_started = new Date();
  24
  25         var timerStop = function timerStop(data_end) {
  26             var time = (new Date()) - timer_started;
  27             var data = shallowMergeObjects(data_start, data_end);
  28
  29             global.modules.emit('stat timer', {name: stat_name, time: time, data: data});
  30         };
  31
  32         return {
  33             stop: timerStop
  34         };
  35     }
  36 };
  37
  38
  39
  40 function shallowMergeObjects(/** argn, ... **/) {
  41     var arg_idx, arg,
  42         data = {};
  43
  44     for(arg_idx=0; arg_idx<arguments.length; arg_idx++) {
  45         arg = arguments[arg_idx];
  46
  47         if (!arg) {
  48             continue;
  49         }
  50
  51         for(var prop in arg) {
  52             if (arg.hasOwnProperty(prop)) {
  53                 data[prop] = arg[prop];
  54             }
  55         }
  56     }
  57
  58     return data;
  59 }