mongoid stored rack session Rack::Session::RackAndMongo

rack-and-mongo.rb

# inspired by https://github.com/biilmann/mongo_sessions
require 'rack/session/abstract/id'
class Session
	include Mongoid::Document
	field :sid
	field :data
	field :ts, type: Integer
	index :sid, unique: true #dont forget Session.create_indexes
	def Session.find_by_sid(sid)
		Session.first(conditions: {sid: sid})
	end
end
module RackAndMongoAreAwesome
	def destroy(env)
		if sid = current_session_id(env)
			s = Session.find_by_sid(sid)
			s.destroy if s
		end
	end

	private
	def get_session(env, sid)
		sid ||= generate_sid
		s = Session.find_by_sid(sid)
		[sid, s ? unpack(s.data) : {}]
	end
	def set_session(env, sid, session_data, options = {})
		sid ||= generate_sid
		s = Session.find_or_create_by(sid: sid)
		s.ts = Time.now.to_i
		s.data = pack(session_data)
		s.save
		sid
	end

	def pack(data)
		[Marshal.dump(data)].pack("m*")
	end

	def unpack(packed)
		return nil unless packed
		Marshal.load(packed.unpack("m*").first)
	end
end

module Rack
	module Session
		class RackAndMongo < Rack::Session::Abstract::ID
			include RackAndMongoAreAwesome
		end
	end
end
__END__
#app.rb:
Mongoid.configure { |config| config.master = Mongo::Connection.new.db("ultra-awesome-site") }

#config.ru:
require './app.rb' #sinatra
require './rack-and-mongo.rb'
use Rack::Session::RackAndMongo, key: 'rack.session', domain: '.example.com', path: '/', secret: 'change_me',expire_after: 2592000
run App

#thin:
thin start -s1 --socket /tmp/thin.sock

#nginx.conf:
http {
	...
	upstream  backend {
		server	unix:/tmp/thin.0.sock;
	}
	...
	location / {
                proxy_set_header Host $host;
                proxy_pass http://backend;
        }
}

#############
# or using int inside sinatra::base

require './rack-and-mongo.rb'
class App < Sinatra::Base
  use Rack::Session::RackAndMongo, key: 'rack.session', domain: '.example.com', path: '/', secret: 'change_me',expire_after: 2592000