docbrown/app/labor/rate_limit_checker.rb

class RateLimitChecker
  attr_accessor :user
  def initialize(user = nil)
    @user = user
  end

  def limit_by_situation(situation)
    result = case situation
             when "comment_creation"
               user.comments.where("created_at > ?", 30.seconds.ago).size > 9
             when "published_article_creation"
               user.articles.
                 where(published: true).
                 where("created_at > ?", 30.seconds.ago).size > 9
             else
               false
             end
    ping_admins if result == true
    result
  end

  def limit_by_email_recipient_address(address)
    # This is related to the recipient, not the "user" initiator, like in situation.
    EmailMessage.where(to: address).
      where("sent_at > ?", 2.minutes.ago).size > 5
  end

  def ping_admins
    return unless user && Rails.env.production?

    SlackBot.ping(
      "Rate limit exceeded. https://dev.to#{user.path}",
        channel: "abuse-reports",
        username: "rate_limit",
        icon_emoji: ":hand:",
      )
  end
  handle_asynchronously :ping_admins
end