ruby script to create rsyslog discarding terms based on graylog2 blacklist terms

graylog2-blacklist-2-rsyslog.rb

require 'rubygems'
require 'mongo'

@conn = Mongo::Connection.new
@db = @conn['graylog2']
@db.authenticate('grayloguser','grayloguser-mongo-passwd')
@coll = @db['blacklists']
@conf_file = '/etc/rsyslog_disgarding.conf'
@conf_content = ""
@file = File.open(@conf_file,'r')
@conf_content = @file.read
@file.close
@new_config = ''
@coll.find.each do |b| 
  b['blacklisted_terms'].find.each do |t|
    @new_config = @new_config + ":msg, contains, \"#{t['term']}\" ~\n"
  end
end

if @conf_content != @new_config
  @file = File.open(@conf_file,'w')
  @file.write(@new_config)
  @file.close
  system '/etc/init.d/rsyslogforwarder restart'
end