I'm using the nodejs API for cloud storage
https://github.com/GoogleCloudPlatform/gcloud-node
I struggle in find a way to load a file as a string using the createReadStream().
There is an example on how to pipe the file and write in the local environment, but I'd prefer to just load it into a variable.
For future reference, This how I solved it. Fetching data from the buffer continuously.
var gcloud = require("gcloud")({ /* credentials. */ });
var cloudstorage = gcloud.storage();
var myTextFile = cloudstorage.file('your-file.txt');
var fileContents = new Buffer('');
myTextFile.createReadStream()
  .on('data', function(chunk) {
    fileContents = Buffer.concat([fileContents, chunk]);
  })
  .on('end', function() {
    // `fileContents` is ready
  });
The gCloud 3rd party libraries team generously agree in adding a new methods for simplify the request:
https://github.com/GoogleCloudPlatform/gcloud-node/pull/381
Update:
The function is now available in the gcloud library.
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