Simple memcached helper for Sinatra.

sinatra-memcacher.rb

require 'sinatra/base'
require 'memcached'

module Sinatra
  module Memcacher
    module Helpers
      def cache(key, &block)
        return block.call unless options.memcacher_enabled
                  
        begin
          output = memcached.get(key)
        rescue Memcached::NotFound
          output = block.call
          memcached.set(key, output, options.memcacher_expiry)
        end
        output
      end
      
      def expire(key)
        begin
          memcached.delete key
          true
        rescue Memcached::NotFound
          false
        end
      end
  
      private
  
      def memcached
        options.memcacher_client ||= Memcached.new(options.memcacher_server)
      end
    end
    
    def self.registered(app)
      app.helpers Memcacher::Helpers
      
      app.set :memcacher_client, nil
      app.set :memcacher_enabled, false
      app.set :memcacher_server, "127.0.0.1:11211"
      app.set :memcacher_expiry, 3600
    end
  end
  
  register Memcacher
end

Simple memcached module, derived from gioext/sinatra-memcache, updated to use the 'memcached' gem.

Compatible with Sinatra 1.2

Usage

Activate in a modular Sinatra app:

  register Sinatra::Memcacher
  set :memcacher_enabled, true
  set :memcacher_expiry, 86400 

Cache an action:

  get '/' do
    cache "index" do 
      @articles = Article.public.all(order: 'posted_at DESC', limit: 10)
      erb :index
    end
  end

One word - Beautiful :)