This project is related to r509 and r509-ca-http, allowing us to save certificate validity status to a Redis backend via Rack Middleware, so the CA itself doesn't need to know anything about Redis. This is done so that you can run a CA without saving validity status, if you want to do that.
Make sure you have a Redis server running on localhost. The standard configuration should work. You also need to gem install redis.
Ruby will connect to it using Redis.new.
require 'r509/middleware/validity'
use R509::Middleware::Validity
run R509::CertificateAuthority::Http::Server
Now all the issue/revoke/unrevoke events will be saved in your Redis database.