Rate Limiting from Scratch

Episode #406 by Teacher's Avatar David Kimura

Summary

Ever wonder how some companies implement rate limiting based on the plan that you've signed up for? In this episode, we'll use Docker Hub as a case study and implement this feature within our Rails application. We'll do this by creating a custom Rack Middleware to track and throttle the requests.
rails middleware request 22:00

Chapters

  • Introduction (0:00)
  • Generate User Migration (2:57)
  • Setting up the Rate Period (3:32)
  • Using Redis (4:53)
  • Redis Rate Limiter Instance (5:44)
  • Creating the Middleware (6:35)
  • Scoping the. Rate LImiting Routes (10:03)
  • Fetching the user in the Middleware (10:53)
  • Checking if Rate LImit exceeded (12:02)
  • Tracking the current rate (14:26)
  • Quick Recap (15:45)
  • Enabling the Rate Limiter Middleware (16:24)
  • Debugging the Rate LImiter (17:09)
  • Demo (17:51)
  • Checking the Rails console (18:43)
  • Final thoughts (20:15)
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