Simple session persistence with Redis and Sinatra

app.rb

require 'sinatra/base'
require 'httparty'
require 'redis'
require 'json'

class SessionApp < Sinatra::Base

  set :sessions, true

  get "/" do
    session_id = session[:session_id]

    redis = Redis.new
    tweet_hash = JSON.parse(redis.get(session_id) || '[]')

    tweet = HTTParty.get('http://search.twitter.com/search.json?q=twitter&rpp=1').parsed_response['results'].first
    tweet_hash << tweet

    redis.set session_id, tweet_hash.to_json
    
    tweet_hash.inspect
  end
end

config.ru

require './app'
run SessionApp.new

Gemfile

source :rubygems

gem 'sinatra'
gem 'redis'
gem 'httparty'