munin plugin to monitor unicorn connection queue

unicorn__connections_.rb

#!/usr/bin/env ruby
#  Copyright: 2011 Opscode, Inc.
#  Author: Bryan McLellan <btm@loftninjas.org>
#          Solomon White <rubysolo@gmail.com>
#
#   Licensed under the Apache License, Version 2.0 (the "License");
#   you may not use this file except in compliance with the License.
#   You may obtain a copy of the License at
#
#       http://www.apache.org/licenses/LICENSE-2.0
#
#   Unless required by applicable law or agreed to in writing, software
#   distributed under the License is distributed on an "AS IS" BASIS,
#   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
#   See the License for the specific language governing permissions and
#   limitations under the License.
 
require 'rubygems'
require 'raindrops'
 
def collect(type, target)
  stats = case type
  when 'tcp'
    collect_tcp(target)
  when 'socket'
    collect_socket(target)
  end
 
  puts "active.value #{ stats.active }"
  puts "queued.value #{ stats.queued }"
end

def collect_tcp(port)
  addr = [ "0.0.0.0:#{ port }" ]
  stats = Raindrops::Linux.tcp_listener_stats(addr)
  stats[addr[0]]
end

def collect_socket(sock)
  sockets = [ "/tmp/#{ sock }" ]
  stats = Raindrops::Linux.unix_listener_stats(sockets)
  stats[sockets[0]]
end
 
if ARGV[0] == "config"
  puts "graph_title Unicorn - connections"
  puts "graph_args -l 0"
  puts "graph_printf %6.0lf"
  puts "graph_vlabel connections"
  puts "graph_category Unicorn"
  puts "active.label active"
  puts "queued.label queued"
  exit 0
end
 
type, target = *$0.scan(/unicorn_(tcp|socket)_connections_?(.*)/).first
target = ARGV[0] if target.empty? && ARGV.size > 0

if target.empty?
  usage = "Usage: unicorn_(tcp|socket)_connections (port|socket)"
  abort usage
end
 
collect(type, target)