Sensu code for checking an upcoming date

gistfile1.rb

#!/usr/bin/ruby
#
# DESCRIPTION:
#    Given a date will notify if within X days of the date.
#    Defaults
#         Warning:  30 days before date
#         Critical: 15 days before date
#
# DEPENDENCIES:
#   sensu-plugin 
#   chronic
#
#The MIT License (MIT)
#
#Copyright (c) 2015 Patrick Bailey
#
#Permission is hereby granted, free of charge, to any person obtaining a copy
#of this software and associated documentation files (the "Software"), to deal
#in the Software without restriction, including without limitation the rights
#to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
#copies of the Software, and to permit persons to whom the Software is
#furnished to do so, subject to the following conditions:
#
#       The above copyright notice and this permission notice shall be included in all
#copies or substantial portions of the Software.
#
#       THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
#IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
#FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
#AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
#LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
#       OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
#SOFTWARE.
#
#

require 'rubygems' if RUBY_VERSION < '1.9.0'
require 'sensu-plugin/check/cli'
require 'chronic'

class CheckDate < Sensu::Plugin::Check::CLI

  option :date,
         :description => "date to check agains",
         :short => '-d DATE',
         :long => '--date DATE',
         :required => true

  option :days_warn_before,
         :description => "If set will issue a warning if within X number of days of given date",
         :short => '-w DAYS_WARN_BEFORE',
         :long => '--warn DAYS_WARN_BEFORE',
         :default => 30,
         :required => true

  option :days_alarm_before,
         :description => "If set will issue an alarm if within X number of days of given date",
         :short => '-a DAYS_ALARM_BEFORE',
         :long => '--alarm DAYS_ALARM_BEFORE',
         :default => 15,
         :required => true

  option :message,
         :description => "Message to send",
         :short => '-m MESSAGE',
         :long => '--message MESSAGE',
         :required => true

  def initilize
    super
  end

  def run
    date = Chronic.parse(config[:date])

    #Confirm the date given is valid see https://github.com/mojombo/chronic#usage
    if date.nil?
      critical("Invalid date format '" + config[:date] + "', An example of a valid forma is '12/3/2014'")
    end

    if (date - config[:days_alarm_before].to_i*24*3600) < Time.now
      critical(config[:message])
    elsif (date - config[:days_warn_before].to_i*24*3600) < Time.now
      warning(config[:message])
    else
      ok("No need to issue alarm or warning for date '" + date.to_s)
    end
  end
end