caching client-side responses

caching.rb

require 'rest_client'
require 'active_support/cache'

class MyService

  def self.find(id)
    return unless id.present?
    cache("my-service:#{id}", :ttl => 1.day) do
      RestClient.get("http://myservice.com/foo/#{id}")
    end
  end
  
  private

  def self.cache(key, opts={}, &block)
    @cache ||= ActiveSupport::Cache.lookup_store(:memory_store)
    value = @cache.read(key)
    if value.nil? && block_given?
      value = block.call
      opts[:expires_in] = 1.day unless opts[:expires_in]
      @cache.write(key, value, opts)
    end
    value
  end

end