What I came up with for rack-attack

randy_store.rb

class RandyStore
  def initialize(options={})
    @data = if options.is_a?(Redis)
      options
    else
      Redis.new options
    end
  end
  attr_reader :data

  def increment(name, amount = 1, options = {})
    expires = options.delete(:expires_in)
    value = data.incrby name, amount
    data.expire( name, expires ) if expires && value == amount
    value
  end
end