rate_limiter's Introduction
Problem Statement: Design and implement a rate-limiter to protect an API endpoint from abuse. The desired behavior is that each client should be able to make at most 600 req/min. When this limit is exceeded, the API should return HTTP status 429. For the current state of the code Rspec tests rely on a running redis server (redis-server --loglevel warning) Calling Example: def index return head(:too_many_requests) rate_limiter.over_limit? ... end private def rate_limiter RateLimiter.new end Which controller action to limit is hard coded. The Redis server uses default params => runs locally It turns out that there are existing ruby gems which might provide a better starting place for future enhancements of this work. Ex: https://github.com/rkotov93/rails_rate_limiter For future versions: 1) Changes to calling conventions Below kludge can be removed once a Ruby Macro is in place in ApplicationController private def rate_limiter RateLimiter.new end Later the controller APIs should look more like this: ratelimiter :index, :create ... 2) Redis would be stubbed for the tests so a real version of redis would not be needed The actual time period (60 seconds) could be used instead of the 1 second time period used by tests 3) A small rails API can be created for further exploration and testing 4) Reference URLs How to Build an API With Ruby on Rails https://medium.com/swlh/how-to-build-an-api-with-ruby-on-rails-28e27d47455a Reference info https://guides.rubyonrails.org/api_app.html#changing-an-existing-application A Redis Playground https://try.redis.io/ How to return status codes from rails api controllers https://api.rubyonrails.org/classes/ActionController/Head.html HTTP status code 429 - :too_many_requests http://www.railsstatuscodes.com/too_many_requests.html
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