You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: enum_s3.rb
    path of file: ./repos/metasploit-framework/modules/auxiliary/cloud/aws
    
    the code of the file until where you have to start completion: ##
# This module requires Metasploit: https://metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##

require 'aws-sdk-s3'

class MetasploitModule < Msf::Auxiliary
  def initialize(info = {})
    super(
      update_info(
        info,
        'Name'        => 'Amazon Web Services S3 instance enumeration',
        'Description' => %q(
                          Provided
    
  def run
    region = datastore['REGION']

    @s3 = Aws::S3::Client.new(
      region: "us-west-2",      # This doesn't actually filter anything, but
                                #   it's still required.  Thanks AWS.  :-(
      access_key_id: datastore['ACCESS_KEY_ID'],
      secret_access_key: datastore['SECRET_ACCESS_KEY']
    )

    buckets = @s3.list_buckets.buckets
    unless buckets.length > 0
      print_status 'No buckets found.'
      return
    end

    print_good "Found #{buckets.count} buckets."
    if region.nil?
      buckets.each do |i|
        describe_s3_bucket(i)
      end
    else
      print_good "Listing buckets that match REGION '#{datastore['REGION']}':"
      buckets.each do |i|
        if @s3.get_bucket_location(bucket: i.name).location_constraint.starts_with? region
          describe_s3_bucket(i)
        end
      end