Rack middleware to travel in time your rails application

time_machine.rb

class Dummy::TimeMachine
  def initialize(app)
    @app = app
  end

  def call(env)
    Rails.logger.info("[TimeMachine] Starting time travel.")
    Timecop.return
    request = Rack::Request.new(env)
    params = request.params
  
    # Do whatever you need. A simple exapmle by passing time in params
  
    if params["simulate_time"].present?
      my_time = get_date_from_params(params)
      Timecop.travel(my_time)
      Rails.logger.info("[TimeMachine] Traveling to: #{my_time}")
    end

    status, headers, response = @app.call(env)
    Timecop.return
    Rails.logger.info("[TimeMachine] Ending time travel. Ensure reseting time.")
    [status, headers, response]
  end
  
  def get_date_from_params(params)
    time = params["simulate_time"]
    Time.new(time["year"], time["month"], time["day"], time["hour"], time["minute"], time["second"])
  end

end