#! /usr/local/bin/ruby

#  Copyright (c) 2006 Frédéric Senault.  All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
# 1. Redistributions of source code must retain the above copyright
#    notice, this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright
#    notice, this list of conditions and the following disclaimer in the
#    documentation and/or other materials provided with the distribution.
# 3. Neither the name of the author or any contributors may be used to
#    endorse or promote products derived from this software without
#    specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
# SUCH DAMAGE.

# This collecter can be used instead of Nagios - just launch ntest from
# the crontab, and you're set.
#
# It may operate with three kind of data collecting programs :
# - those who are to be launched at every iteratop,
# - those who open for append and immediately close the data files
# - those who can receive a signal to rotate the files themselves
#
# The following config keys are read from ngraph.conf (lists are
#   space delimited) :
# - gfc_pids : a list of pid files of processes to be signalled ;
#     optionnaly a signal (in the uppercase named form - i.e. SIGUSR)
#     may be added in parentheses after the filename ; by default a
#     SIGHUP is fired.
# - gfc_run : a list of processes to launch ; they are simply
#     shelled, without care for any return status or output.
# - gfc_files : the list of files to read line by line.
# - gfc_sleep : the time to wait once all the processes are launched
#     and / or signalled ; default is two seconds.
#
# The performance data read from the files is based on Nagios
#   perfdata files :
#
# unix_time||host||address||service||result||perfdata||command
#
# Of those, only the time and the perfdata are really mandatory ; host
#   is used too, buy may be overriden.

class GenericFileCollecter < Collecter
	def initialize()
		if($conf.has_key?(:gfc_pids)) then
			$conf[:gfc_pids].scan(/([a-zA-Z0-9._\/-]+)(?:\(([A-Z0-9]+)\))?/) do |pidf, sig|
				sig ||= 'HUP'
				begin
					pid = IO.read(pidf)
					Process.kill(sig, pid.to_i) if(pid)
				rescue Exception
				end
			end
		end
		if($conf.has_key?(:gfc_run)) then
			$conf[:gfc_run].scan(/([^ ]+)/) do |cmd|
				begin
					`#{cmd}`
					puts "#{cmd} : #{$?.exitcode}" if($?.exitcode != 0)
				rescue Exception
				end
			end
		end
		sleep(($conf.has_key?(:gfc_sleep) ? $conf[:gfc_sleep] : 2))
	end
	def each()
		return unless($conf.has_key?(:gfc_files))
		$conf[:gfc_files].split(/ /).each do |f|
			if(File.exists? f) then
				File.rename(f, f + '.old')
				File.open(f + '.old') do |h|
					h.each do |l|
						l.chomp!
						yield(GenericServiceData.new(l)) unless(l == '')
					end
				end
			end
		end
	end
end

class GenericServiceData < NGraphData
	attr_reader :address, :service, :result, :command
	def initialize(lgn)
		(@time, @host, @address, @service, @result, @perfdata, @command) = \
			lgn.split(/\|\|/)
		@time = @time.to_i
	end
	def short()
		@host + '/' + @service
	end
end