Long-running task which periodically checks the internet connection by pinging Google's DNS server and reporting outages

connection_test.rb

require 'net/ping'

HOST = '8.8.4.4'
start = Time.now
puts "#{start} Starting connection check. Pinging #{HOST}"

icmp = Net::Ping::ICMP.new(HOST)
@down = false
total = 0

begin
  while true
    success = false
    begin
      success = icmp.ping
    rescue StandardError
      success = false
    end
    if success && @down
      down_for = Time.now - @dropped
      puts "#{Time.now} Connection back up (down for #{down_for.round}s)"
      total += down_for
      @dropped = nil
    elsif !success && !@down
      @dropped = Time.now
      puts "#{@dropped} Connection is down"
    end
    @down = !success
    sleep 5
  end
rescue SystemExit, Interrupt
  finish = Time.now
  total += (finish - @dropped) if @dropped # incase Ctrl-C while down
  puts "#{finish} finishing. Ran for #{(finish - start).round}s. Down for a total of #{total.round}s"
end