Monitor a URL for downtime

check_url

#!/usr/bin/env ruby

require 'rubygems'
require 'term/ansicolor'
require 'net/ping'

String.send(:include, Term::ANSIColor)

url = ARGV[0]

raise "No url provided" if url.nil?

url = 'http://' + url unless url =~ /http(s)?:\/\//

pinger = Net::Ping::HTTP.new(url)

puts "Checking #{url} - pausing for 1 second between requests..."

last_status = nil
interrupted = false
trap('INT') { interrupted = true }
loop do
  current_status = pinger.ping
  if current_status != last_status
    if current_status
      # up
      puts "\nUP #{Time.now}".green
    else
      # down
      puts "\nDOWN #{Time.now}".red
    end
  end
  print '.'
  $stdout.flush
  last_status = current_status
  sleep 1
  if interrupted
    puts "\nEXIT #{Time.now}".yellow
    break
  end
end