Using redis for session store in a Hanami application

To be able to list logged in users in my Hanami application I’ve switched from cookies to redis for session store. The setup is quite brief thanks to the redis-rack gem.

1. Gemfile

Add the gem to the Gemfile:

gem 'redis-rack'

2. application.rb

Require redis:

require 'rack/session/redis'

Switch from cookies to redis:

#sessions :cookie, secret: ENV['WEB_SESSIONS_SECRET']
sessions :redis, secret: ENV['WEB_SESSIONS_SECRET']

3. Admin panel controller action

In my simple example below the code returns an array of logged-in user IDs to then query from the DB.

def call(params)
  store = Redis::Store.new
  session_keys = store.keys
  
  users = []
  
  session_keys.each do |s_key| 
    s_value = store.get(s_key)
    users << s_value["current_user"]
  end
end

The s_key returns the rack session ID and the s_value returns the everything stored in the session:

s_key: rack:session:1sdrf724945701f13d0a5hju8ffb0078572fser42137948sdfr0d1fhju89bae4a
s_value: {"_csrf_token"=>"9sfg5461cfsdgh7285e16616c974we45t0db5c73dcfc1312b3c9ab91937b809c2", "LOCK"=>"Off", "current_user_class"=>Teacher, "session_start_time"=>2019-07-25 17:26:19 +0200, "__last_request_id"=>"sde458c7454745tg6d8a964b223456f2", "current_user"=>1}

Credits

Thanks to Luca Guidi, the creator of the Hanami framework and the redis-store.

---

Post a comment:

Name

E-mail (optional)

Message (kramdown markup allowed)

Comments will appear after moderation.