Ruby version of a simple monitoring web app

monitor.rb

require 'sinatra'

get '/hello' do
  # Update the 'last modified' time of a specific file to the current time
  FileUtils.touch('status')

  "Hello to you too!"
end

get '/check/:minutes' do |minutes|
  # Get the last modified time of a specific file in seconds
  last_modified = File.mtime('status')

  # Get the current time in seconds
  now = Time.now

  # Calculate how much time has passed
  difference = now - last_modified

  # Convert the minutes into seconds
  seconds = minutes.to_i * 60

  # Firstly we check if there has been a hello in the last X minutes.
  # If there hasn't we check if the last hello was in the last 2*X minutes,
  # if so, we can send a Telegram message saying that something has gone wrong.
  # If the last hello was more than 2*x minutes ago, then it is still offline.
  if difference < seconds
    "It has said hello recently"
  elsif difference < seconds * 2
    "Offline and I should send a Telegram message"
  else
     "Still offline. Should I send a message?"
  end
end