CallbacksFn.js

'use strict'; var fs = require('fs'); var FilesizeWatcher = function(path) { var self = this; self.callbacks = {}; if (/^\//.test(path) === false) { self.callbacks['error']('Path does not start with a slash'); return; } fs.stat(path, function(err, stats) { self.lastfilesize = stats.size; }); self.interval = setInterval( function() { fs.stat(path, function(err, stats) { if (stats.size > self.lastfilesize) { self.callbacks['grew'](stats.size - self.lastfilesize); self.lastfilesize = stats.size; } if (stats.size < self.lastfilesize) { self.callbacks['shrank'](self.lastfilesize - stats.size); self.lastfilesize = stats.size; } }, 1000); }); }; FilesizeWatcher.prototype.on = function(eventType, callback) { this.callbacks[eventType] = callback; }; FilesizeWatcher.prototype.stop = function() { clearInterval(this.interval); }; module.exports = FilesizeWatcher;