sensu4u.rb

require 'net/http'
require 'uri'
require 'json'

# get the current status DB
begin
  data = File.read('/tmp/sensudata')
  data = JSON.parse(data)
rescue
  data = {}
end

# what time is it?
time = Time.now.to_i

# get the list of checks from sensu
uri = URI('http://sensu:4567/checks')
res = Net::HTTP.get_response(uri)
checks = JSON.parse(res.body)

# now enumerate the checks
checks.each do |c|
  name = c['name']
  interval = c['interval']
  last = data[name].to_i
  puts "#{name} --> #{time} - #{last}  = #{time - last} >= #{interval}?\n"
  if time - last >= interval
    puts "I should check #{name}"
    data[name] = time # set the data for this check to now

    #### ATROCITY ALERT ###
    # Even though I have a post URI, and even though Net:HTTP can parse it
    # as demonstrated by get_response, I still have to instantitate an
    # http object with the host and port? Really? Thanks Ruby.
    # php4life -- REL
    req = Net::HTTP::Post.new('http://sensu:4567/request', initheader = {'Content-Type' =>'application/json'})
    req.body = {check: name}.to_json
    res = Net::HTTP.start('sensu', 4567) do |http|
      http.request(req)
    end
  end
end

File.write('/tmp/sensudata', JSON.generate(data))