Simple EventSource factory object for angular.js

event_source_factory.js

!function(factories){
  factories.factory('$eventSource', ['$window', function($window){
    var EventSource = $window.EventSource;

    function parse(obj){
      try { var json = JSON.parse(obj); }
      catch(e) { json = {}; }
      finally { return json; }
    }

    return function(url){
      var esrc = new EventSource(url);

      return {
        on:function(type, callback){
          esrc.addEventListener(type, function(ev){
            callback(parse(ev.data));
          });
        }
      };
    }
  }]);
}(angular.module('gp.Factories'));