simple script for checking network stabilty by using curl http requests

check_net.rb

#!/usr/bin/env ruby

# simple script for checking network stabilty

# cron me like:
# */15 * * * * ruby /home/user/check_net.rb URL >> /home/user/check_net.log
# set URL to https://... to check dns resolution, tls handshake and http request at once

# output
# <public-ip-of-checking-host>/<reverse-ip-lookup-of-checking-host>/<time>/status

# sample output 
# 1.2.3.4/hostname.of.ip/Mon May 20 20:15:01 +0200 2019: .t.....t..................................t.............E...................E...........E...........
# return values: 94x 0 | 3x 6 | 3x 28


LOOPS = 100
check_url = ARGV.first
ip = `curl --silent ifconfig.me`
host = `curl --silent ifconfig.me/host`

return_values = []
time = Time.now
print "#{ip}/#{host}/#{time}: "
cmd = "curl --silent '#{check_url}' \
  -H 'check_net.rb'  \
  -H 'DNT: 1' --compressed  \
  --connect-timeout 2 --max-time 5"

LOOPS.times do |_|
  `#{cmd}`
  return_values << $?.exitstatus
  print case $?.exitstatus
          when 0
            '.' # success
          when 28
            't' # Timeout
          else
            'E' # other error
  end
  sleep 0.5
end

statstring = return_values.uniq.sort.map do |return_value|
  "#{return_values.count(return_value)}x #{return_value}"
end
puts "\nreturn values: #{statstring.join(" | ")}"