memcached-graphite.rb

#!/usr/bin/env ruby
#
# Push Memcached stats into graphite
#
# Dependencies
# -----------
# - Ruby gem `memcached`
#
# ===
#
# TODO: HitRatio percent and per second calculations
#
# Copyright 2012 Pete Shima <me@peteshima.com>
#
# Released under the same terms as Sensu (the MIT license); see LICENSE
# for details.

require 'rubygems' if RUBY_VERSION < '1.9.0'
require 'sensu-plugin/metric/cli'
require 'memcached'
require 'socket'

class MemcachedGraphite < Sensu::Plugin::Metric::CLI::Graphite

  option :host,
         :short       => "-h HOST",
         :long        => "--host HOST",
         :description => "Memcached Host to connect to",
         :default     => 'localhost'

  option :port,
         :short       => "-p PORT",
         :long        => "--port PORT",
         :description => "Memcached Port to connect to",
         :proc        => proc { |p| p.to_i },
         :default     => 11211

  option :scheme,
         :description => "Metric naming scheme, text to prepend to metric",
         :short       => "-s SCHEME",
         :long        => "--scheme SCHEME",
         :default     => "#{::Socket.gethostname}.memcached"

  def run
    cache = Memcached.new("#{config[:host]}:#{config[:port]}")

    cache.stats.each do |k, v|
      output "#{config[:scheme]}.#{k}", v
    end

    ok
  end

end