Google cloud storage directory size

Question

I'm trying to find out how to calculate the size of a directory inside a google-cloud-storage bucket.

I've found two ways so far:

• Using gsutils (which I can't really, because it won't be available in the machine I need to do this from)
• Using the getMetadata method from the nodejs library.

The problem is that the getMetatada method only works on files, and not directories (or prefixes as they're called).

I could list all the files and ask them all for their size but getMetadata doesn't allow for query batching and I would probably be making people angry at @google.

Do you guys know of any way to do that properly in a respectful manner?

Sincerely

Answer 1

If you were able to use gsutil, you could use du, like this:

gsutil du -sh YOUR_BUCKET/YOUR_DIRECTORY

The -s flag will give you only the size of the directory, if you remove it you will also see the size of the files inside. The -h flag returns the size in a human-readable format (KiB,MiB, etc). If not present, it will display the size in bytes.

But, since you mention you can't do it like that, you will have to use, as mentioned, getMetadata.

This simple script will show the size in the console, in bytes, of all of your files in the folder you wish. You can later modify it to add up those sizes.

var http = require("http");
http.createServer(function (request, response) {
   const Storage = require('@google-cloud/storage');
   const projectId = "PROJECT-ID";
   const bucketName = "BUCKET-NAME";
   const storage = Storage({
       projectId: projectId,
   });
  const options = {
    prefix: "FOLDER-IN-BUCKET/"
  }
  storage
    .bucket(bucketName)
    .getFiles(options)
    .then(results => {
        const files = results[0];
        files.forEach(file => {
          storage.
            bucket(bucketName)
            .file(file.name)
            .getMetadata()
            .then(metadata_results => {
                const metadata = metadata_results[0];
                console.log(metadata.size);
                console.log(metadata.name);
          }).catch(metadata_err => {
            console.error(metadata_err);
          });
        });
     }).catch(err => {
        console.error(err);
    });
   response.writeHead(200, {'Content-Type': 'text/plain'});
   response.end('Hello World\n');
}).listen(8080);
console.log("Hello World");

Don't forget to add the dependency for Cloud Storage in your package.json.

You can follow this suggestion, use daily storage logs, and read said logs from Node