Class: Drone::Interfaces::Collectd

Inherits:
Base
  • Object
show all
Defined in:
lib/drone_collectd/collectd.rb

Overview

Send data to collectd periodically, this interface except a specific format for the metric names which is:

plugin/type the simplest form being: plugin/type

Constant Summary collapse

NAME_FORMAT =

1.9 only … NAME_FORMAT = %r(?<plugin>w+)(:(?<plugin_instance>w+))?/(?<type>w+)(:(?<type_instance>w+))?

%r{(\w+)(?::(\w+))?/(\w+)(?::(\w+))?}

Instance Method Summary collapse

Constructor Details

#initialize(period, args = {}) ⇒ Collectd

Instantiate a collectd interface

Parameters:

  • period (Numeric) —

    the period passed to the Base class

  • hostname (String) —

    the hostname to use for collectd

  • address (String) —

    the address where the collectd daemon is listening

  • port (Numeric) —

    The collectd daemon port



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# File 'lib/drone_collectd/collectd.rb', line 29

def initialize(period, args = {})        
  super(period)
  @hostname = args.delete(:hostname)
  @address = args.delete(:address) || '127.0.0.1'
  @port = args.delete(:port) || 25826
  @reported_percentiles = args.delete(:percentiles)
  @socket = EM::open_datagram_socket('0.0.0.0', nil)
  
  unless args.empty?
    raise ArgumentError, "unknown keys: #{args.keys}"
  end
end

Instance Method Details

#output ⇒ Object 



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# File 'lib/drone_collectd/collectd.rb', line 42

def output
  
  Drone::each_metric do |m|
    # parse the name
    if NAME_FORMAT.match(m.name)
      # build the packet
      data = DroneCollectd::CollectdPacket.new
      data.host = @hostname
      data.time = Time.now.to_i
      data.interval = @period
      data.plugin = $1.to_s
      data.plugin_instance = $2.to_s
      data.type = $3.to_s
      data.type_instance = $4.to_s
      
      case m
      when Metrics::Counter
        data.add_value(:counter, m.value )
        
      when Metrics::Gauge
        data.add_value(:gauge, m.value )
        
      when Metrics::Meter
        # mean:GAUGE:U:U, rate1:GAUGE:U:U, rate5:GAUGE:U:U, rate15:GAUGE:U:U
        data.add_value(:gauge, m.mean_rate )
        data.add_value(:gauge, m.one_minute_rate )
        data.add_value(:gauge, m.five_minutes_rate )
        data.add_value(:gauge, m.fifteen_minutes_rate )
      
      when Metrics::Timer, Metrics::Histogram
        # min:GAUGE:0:U,  max:GAUGE:0:U,  mean:GAUGE:0:U, stddev:GAUGE:U:U, median:GAUGE:0:U, p75:GAUGE:0:U, p95:GAUGE:0:U
        data.add_value(:gauge, m.min )
        data.add_value(:gauge, m.max )
        data.add_value(:gauge, m.mean )
        data.add_value(:gauge, m.stdDev )
        
        percs = m.percentiles( *@reported_percentiles )
        percs.each do |p|
          data.add_value(:gauge, p )
        end
      
      end
      
      # and send it
      @socket.send_datagram(data.build_packet, @address, @port)
    else
      puts "Metric with incorrect name ignored: #{m.name}"
    end
  end
  
end