Raterr allows you to enforce rate limiting restrictions based on ip address.

Add this line to your application's Gemfile:

gem 'raterr'

And then execute:

$ bundle

Or install it yourself as:

$ gem install raterr

For Ruby based application you need to tell Raterr what store to use. Currently it supports a simple hash, or Redis It is best to load the store in an initializer of any other kind of file that is loaded initially.

# Use either
Raterr.store = Hash.new
# Or
Raterr.store = Redis.new

To enforce rate limiting use:

Raterr.enforce(request, period: :minute, max: 200, code: 429)

request might be any data type that has an ip method. For Rails applications that would be the request method.

The result of Raterr.enforce is always a pseudo status. In case the rate limit has not been reached you will get a pseudo 200 status + the number of attempts made. This allows you to do additional checks (say a warning if you are about to reach the threshhold). If it has been reached you will get whatever status you configured, or the default one, which is 429 + a text message.

An example usage in a Rails application would be:

class MyController < Base::ApplicationController
  before_action :rate_limit, only: :index

  def index
    # Do something cool
  end

  private

  def rate_limit
    result = Raterr.enforce(request, period: :minute, max: 10)
    if result[:status] == 429
      # Do whatever you want to do when the rate limit is reached
      render plain: result[:text], status: result[:status] and return
    else
      puts "Number of attempts: #{result[:attempts]}"
    end
  end
end

If you want to add limiting to the whole app you would put it in an application controller and so on...

You can configure the period error code and the max attempts. The allowed periods are: :minute, :hour, :day. The default error code is 429. The default max attempts is 100.

After checking out the repo, run bin/setup to install dependencies. Then, run rake spec to run the tests. You can also run bin/console for an interactive prompt that will allow you to experiment.

To install this gem onto your local machine, run bundle exec rake install. To release a new version, update the version number in version.rb, and then run bundle exec rake release, which will create a git tag for the version, push git commits and tags, and push the .gem file to rubygems.org.

Bug reports and pull requests are welcome on GitHub at https://github.com/wizardone/raterr. This project is intended to be a safe, welcoming space for collaboration, and contributors are expected to adhere to the Contributor Covenant code of conduct.

The gem is available as open source under the terms of the MIT License.