parse nagios.debug log and print start and finished times for host and service checks

nagios-debug-log-introspector.rb

#!/usr/bin/env ruby                                                                                                                                                                                                        

require 'time'
STDOUT.sync = true
def time(stuff)
  Time.at(stuff.to_f).strftime("%H:%M:%S")
end

while line = $stdin.readline
  if line =~ /\A\[(.*?)\] \[.*?\] \[.*?\] Attempting to run scheduled check of service '([^']+)' on host '([^']+)'/
    puts "scheduled_at=#{time($1)} host=#{$3} service='#{$2}'"
  elsif line =~ /\A\[(.*?)\] \[.*?\] \[.*?\] Attempting to run scheduled check of host '([^']+)'/
    puts "scheduled_at=#{time($1)} host=#{$2}"
  end
  if line =~ /\A\[(.*?)\] \[.*?\] \[.*?\]\s+HOST: (.*?), SERVICE: (.*?),.*RETURN CODE: (\d)/
    puts "finished_at=#{time($1)} host=#{$2} service=#{$3} return_code=#{$4}"
  elsif line =~ /\A\[(.*?)\] \[.*?\] \[.*?\]\s+HOST: (.*?), ATTEMPT=(.*?),.*?, NEW STATE=(\d)/
    puts "finished_at=#{time($1)} host=#{$2} attempt=#{$3} new_state=#{$4}"
  end
end