A watchdog for ahn v0.1

watchdog.rb

#!/usr/bin/env ruby

require 'rubygems'
require 'mail' # gem install mail
require 'fileutils' # for 1.8

BASE_PATH = '' # Place your path here for ahn
DEAMON    = '' # Place the deamon path and name here

def send_email
  ip   = get_ip # You should create this code yourself
  mail = Mail.new
  mail.to       ''  # Write who should get the email
  mail.from     ''  # who sent it ?
  mail.subject  'Server crash - restarted it'
  mail.body     'The server %s had ahn crashed.' % ip
  mail.add_file "#{BASE_PATH}/log/adhearsion.log"

  # configure your email settings here
  mail.delivery_method.settings = {:address => '', 
                                   :authentication => nil,
                                   :enable_starttls_auto => true, 
                                   :domain => ip, :port => 25,
                                   :password => nil, :user_name => nil }
  mail.deliver
rescue
end

begin
  pid = File.open("#{BASE_PATH}/adhearsion.pid").read.chomp # if file not exists, it will raise an exception ...
  Process.kill 0, pid.to_i
rescue => e
  send_email
  FileUtils.mv("#{BASE_PATH}/log/adhearsion.log", 
               "#{BASE_PATH}/log/adhearsion.log.#{Time.now.strftime('%d%m%Y%H%M%S')}")
  system("#{DEAMON} restart")
end