Can't connect to the storage server in the Google Compute Engine Tutorial for Node.js - node.js

Question

I'm following Google's tutorial to integrate cloud storage with Node.js. I'm having problems connecting to the Cloud storage server.
In the tutorial, you create the server using
$ gsutil mb gs://<your-project-id>
$ gsutil defacl set public-read gs://<your-project-id>
Afterwards, you configure the config.js file in the sample project to use the created storage server. Then, the following function (in the image.js file) is used as a request preprocessor to upload files to the cloud storage.
function processUploads(req, resp, next) {
var numFiles = Object.keys(req.files).length;
if (!numFiles) return next();
function checkNext(err) {
numFiles--;
if (numFiles === 0) next();
}
Object.keys(req.files).forEach(function(key) {
var uploadedFile = req.files[key];
var file = bucket.file(uploadedFile.name);
var stream = file.createWriteStream();
stream.on('error', function(err) {
uploadedFile.cloudStorageError = err;
checkNext();
});
stream.on('complete', function() {
uploadedFile.cloudStorageObject = uploadedFile.name;
uploadedFile.cloudStoragePublicUrl = getPublicUrl(uploadedFile.name);
file.makePublic(checkNext);
});
stream.end(uploadedFile.buffer);
});
}
The problem is that, when you upload a file in the form, neither the complete nor the error callbacks are called when you upload a file. It seems the storage server is simply not responding.
Can anyone help me make it work?

Answer 1

After fiddling around a little more, I found out the files were actually being stored in the cloud. I was able to use the browse function in the Storage server session of the Google Compute Engine Console in order to see the files I uploaded.
But my callbacks weren't being called. After reading the source code, it appears that the sample code is outdated. One I replaced the event from complete to finish, as shown down below, everything started working perfectly.
function processUploads(req, resp, next) {
var numFiles = Object.keys(req.files).length;
if (!numFiles) return next();
function checkNext(err) {
numFiles--;
if (numFiles === 0) next();
}
Object.keys(req.files).forEach(function(key) {
var uploadedFile = req.files[key];
var file = bucket.file(uploadedFile.name);
var stream = file.createWriteStream();
stream.on('error', function(err) {
uploadedFile.cloudStorageError = err;
checkNext();
});
stream.on('finish', function() {
uploadedFile.cloudStorageObject = uploadedFile.name;
uploadedFile.cloudStoragePublicUrl = getPublicUrl(uploadedFile.name);
file.makePublic(checkNext);
});
stream.write(uploadedFile.buffer);
stream.end();
});
}
I've also found a gcloud package issue that shows there was a breaking change, but the documentation is outdated as it tells you to use complete rather than finish at the time of this writing.