file watching in nodejs

nodefilewatch.js

'use strict';
var request = require('request');
var fs = require('fs');
var Inotify = require('inotify').Inotify;
var inotify = new Inotify();
var return_watch_dir = function (dir_path) {
  var return_data, headers, data_string;
  return_data = {
    path: dir_path,
    watch_for: Inotify.IN_CLOSE_WRITE,
    callback: function (event) {
      var request_url, mask, file_loc, r, str;
      request_url = 'http://example.com/usefile';
      mask = event.mask;
      file_loc = dir_path + '/' + event.name;
      if (mask & Inotify.IN_CLOSE_WRITE) {
        r = request.put({url : request_url + '?file_name=' + event.name});
        fs.createReadStream(file_loc).pipe(r);
        str = '';
        r.on('data', function (chunk) {
          str += chunk;
        });
        r.on('end', function () {
          console.log(str);
        });
      }
    }
  };
  return return_data;
};
//test watcher
inotify.addWatch(return_watch_dir('/home/user/test'));