Heroku -> S3 Backup rake task

cron.rake

desc "This task is called by the Heroku cron add-on"
task :cron => :environment do
  Rake::Task['heroku:backup'].invoke
end

heroku.rake

require 'heroku/command'
require 'aws/s3'

namespace :heroku do
  desc "create a pg_dump and send to S3"
  task :backup => :environment do
    APP_NAME = ENV['HEROKU_APP_NAME']

    Rails.logger.info("Backup started @ #{Time.now}")
    Heroku::Auth.credentials = [ ENV['HEROKU_USERNAME'], ENV['HEROKU_API_KEY'] ]

    Rails.logger.info('Capturing new pg_dump')

    Heroku::Command.load
    pg_backup = Heroku::Command::Pgbackups.new([], { :app => APP_NAME, :expire => true })
    pg_backup.capture

    Rails.logger.info('Opening S3 connection')
    config = YAML.load(File.open("#{Rails.root}/config/amazon_s3.yml"))[Rails.env]
    AWS::S3::Base.establish_connection!(
      :access_key_id => config['access_key_id'],
      :secret_access_key => config['secret_access_key']
    )
    BACKUP_BUCKET_NAME = config['backup_bucket_name']

    begin
      AWS::S3::Bucket.find(BACKUP_BUCKET_NAME)
    rescue AWS::S3::NoSuchBucket
      AWS::S3::Bucket.create(BACKUP_BUCKET_NAME)
    end

    Rails.logger.info('Opening new pg_dump')
    pg_backup_client = pg_backup.send(:pgbackup_client) # protected
    local_pg_dump = open(pg_backup_client.get_latest_backup['public_url'])
    Rails.logger.info('Finished opening new pg_dump')

    Rails.logger.info('Uploading to S3 bucket')
    AWS::S3::S3Object.store(Time.now.to_s(:number), local_pg_dump, BACKUP_BUCKET_NAME)

    Rails.logger.info("Backup completed @ #{Time.now}")
  end
end