worker.rb

require 'httparty'

class UsersWorker
  include Sidekiq::Worker

  HOSTNAME = 'https://interview-api-app.herokuapp.com/users'

  def perform(options={})
    page_size = options[:page_size] || 10
    page = options[:page] || 1
    max_pages = options[:max_pages] || Float::INFINITY

    while(true) do
      users = fetch_users(page, page_size)

      users.each do |user_hsh|
        user = User.find_or_initialize_by(id: user_hsh['id'])
        user.update_attributes(user_hsh)
      end

      page += 1
      break if users.blank? || page > max_pages
    end

  end

  private
  
  def query_params(page, page_size)
    {
      offset: (page-1)*page_size,
      limit: page_size
    }.to_query
  end
  
  def fetch_users(page, page_size)
    url = "#{HOSTNAME}?#{query_params(page, page_size)}"
    headers = {
      "Authorization": ENV['AUTHORIZATION_KEY'],
    }

    response = HTTParty.get(url, headers: headers)
    users = JSON.parse(response.body)
  end
end