16 minutes into the video on grains code base. I'm through introductions, the main package, server and whitelist configs. 30 more minutes of footage to scrub through. Containing blacklist configs, the config package, the server package, the database package, and the frontend.  

 What is grains? 

 My relay implementation. Highly configurable more many use cases. 
https://github.com/0ceanslim/grain