formidableGridFs.js

var IncomingForm = require('formidable');
var util = require('util');
var EventEmitter = require('events').EventEmitter;
var GridStore = require('mongodb').GridStore;
var pauseStream = require('pause-stream');
var ObjectID = require('mongodb').ObjectID;

function IncomingFormGridFS(options) {
  if(!(this instanceof IncomingFormGridFS)) return new IncomingFormGridFS(options);

  EventEmitter.call(this);

  // provide defaults for all options
  var defaults = {
    mongodbConnection: 'mongodb://localhost:27017/mylocation',
    error: false,
    ended: false,
    maxFields: 1000,
    maxFieldsSize: 2 * 1024 * 1024,
    keepExtensions: false,
    uploadDir: '/tmp',
    encoding: 'utf-8',
    headers: null,
    type: null,
    hash false
    bytesReceived: null,
    bytesExpected: null,
    _parser: null,
    _flushing: 0,
    _fieldsSize: 0,
    openedFiles: []
  };

  options = options || {};

  // extend "this" with options and
  // overwrite defaults with provided options 
  for (var val in defaults) {
    this[val] = options[val] || defaults[val];
  }


  return this;
}

util.inherits(IncomingFormGridFS, IncomingForm);


IncomingFormGridFS.prototype.handlePart = function(part) {
  var self=this;
  if(!part.filename) return self.handlePart(part);

  var pStream = pauseStream();
  part.pipe(pStream.pause());

  var fileMeta = {
    name: part.filename,
    path: 'void', // TODO
    type: part.mime
  };
  self.openedFiles.push(fileMeta);
  self.emit('fileBegin', part.name, fileMeta);

  new GridStore(self.mongodbConnection, new ObjectID(), fileMeta.name , 'w', {
    metadata: {
      filename: fileMeta.name
    },
    content_type: part.mime
  }).open(function(err, gridFile) {

    self._flushing++;

    pStream.on('data', function(buffer) {
      pStream.pause();
      gridFile.write(buffer, function(err) {
        if(err) console.error(err);
        pStream.resume();
      });
    });

    pStream.on('end', function() {
      gridFile.close(function(err, fileData) {
        fileMeta.hash = fileData.md5;
        fileMeta.length = fileData.length;
        fileMeta._id = fileData._id;
        fileMeta.uploadDate = fileData.uploadDate;
        self._flushing--;
        self.emit('file', part.name, fileMeta);
        self._maybeEnd();
      });
    });

    pStream.resume();
  });
};

IncomingFormGridFS.prototype._error = function(err) {
  if(this.error || this.ended) {
    return;
  }

  console.log('gridfs incfrm _ERROR ');

  this.error = err;
  this.pause();
  this.emit('error', err);

  // no need to delete files, GridFS kicks it when we dont close the stream probably
};

module.exports = IncomingFormGridFS;

Versteh nicht ganz was das soll EventEmitter.call(this);.
(https://gist.github.com/jorin-vogel/6410640#file-formidablegridfs-js-L11)
Kannste mich aufklären?

return this würde ich auch weglassen.
(https://gist.github.com/jorin-vogel/6410640#file-formidablegridfs-js-L43)

mongodbConnection: 'mongodb://localhost:27017/mylocation',
Ist falsch, GridStore braucht ja direkt ne connection-resource und nicht die URI

die anderen zwei sachen waren copy-paste von Formidable