Simple site pinging script in ruby

pinger.rb

URL = "http://www.lumosity.com"
MATCH_STRING = "Start Training"
INTERVAL = 30
DEBUG = false

def log(msg)
  puts "[#{Time.now}] #{msg}"
end

def log_response(response)
  puts "----------------------------"
  puts response
  puts "----------------------------"
end

def debug(msg)
  log(msg) if DEBUG
end

def ping(cmd)
  resp= `#{cmd}`
  status_line = resp.split("\n").grep(/Status: \d{3}/)
  status = resp.match(/Status: \d{3}/)[0].split(" ").last.to_i

  @@counts[status] = (@@counts[status] || 0) + 1
  
  if status == 200
    debug "200 OK received :)"
  elsif (300..399).include?(status)
    log "ERROR: 30x  code received!"
    log_response(resp)
  elsif (400..499).include?(status)
    log "ERROR: 40x  code received!"
    log_response(resp)
  elsif (500..599).include?(status)
    log "ERROR: 50x  code received!"
    log_response(resp)
  else
    log "ERROR: no status code received"
  end
rescue StandardError => ex
    log "ERROR: exception while parsing response: #{ex.inspect}"
end

cmd = 'curl -0v -H "Cache-Control: no-cache, max-age=0" -H "User-Agent: LumosLabsPinger/1.0 (1)" -H "X-Newrelic-Ignore: true" ' + URL + ' 2>&1'
debug cmd
@@counts = {}

start = Time.now
log "Starting up pinger for URL #{URL} with interval #{INTERVAL} seconds"
while true do
  begin
    ping(cmd)
    sleep(INTERVAL)
  rescue SystemExit, Interrupt
    puts "Exiting after #{(Time.now - start).ceil} seconds..."
    puts @@counts.inspect
    exit
  end
end