Fog - Get size of object in S3

Question

How can I get the size of an s3 object in fog without downloading it?

For example:

connection.get_object(dir.key, latest_backup.key).body.size

requires I download the object first.

How can I find out the size before downloading?

Answer 1

To find the size of the file do this:

connection.head_object(bucket_name, object_name, options = {})

And look for this in the object that comes back:

Content-Length

This will also give you other good information like the checksum in ETag and other things like that.

Reference: http://rubydoc.info/gems/fog/Fog/Storage/AWS/Real#head_object-instance_method

Answer 2

remote_file.content_length does the trick for me (Fog 1.21.0)

where remote_file is gotten from the remote directory, like so:

def connection
  Fog::Storage.new(fog_config)
end

def directory
  connection.directories.get(bucket)
end

def remote_file
  remote_files = directory.files.last
end

Answer 3

module S3
  def self.directory
    connection.directories.new(key: ENV['AWS_BUCKET'])
  end

  def self.connection
    Fog::Storage.new(
      provider: 'AWS',
      aws_access_key_id: ENV['AWS_ACCESS_KEY_ID'],
      aws_secret_access_key: ENV['AWS_SECRET_ACCESS_KEY'],
      region: ENV['AWS_REGION']
    )
  end

  def self.file(key)
    directory.files.head(key)
  end
end

file = S3.file(key)
file.content_length