Top Level Namespace

Includes:
Librato::Metrics

Defined Under Namespace

Modules: Librato

Instance Method Summary collapse

Instance Method Details

#err(msg) ⇒ Object 



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# File 'bin/librato-metrics-tap-jmxbeans', line 8

def err(msg)
  $stderr.puts msg
  exit 1
end

#get_beans(bean_name) ⇒ Object 



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# File 'bin/librato-metrics-tap-jmxbeans', line 13

def get_beans(bean_name)
  beans = Taps::JMX::match_beans(bean_name)
  unless beans && beans.length > 0
    err "No beans match: #{bean_name}"
  end
  beans
end

#load_yaml(filename) ⇒ Object 



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# File 'bin/librato-metrics-tap-jmxbeans', line 45

def load_yaml(filename)
  begin
    yaml_file= File.open(filename, "r")
  rescue => err
    puts "Failed to open yaml file #{filename}: #{err.message}"
    exit 1
  end

  begin
    yaml = YAML::load(yaml_file)
  rescue => err
    puts "Failed to parse yaml #{filename}: #{err.message}"
    exit 1
  end
  yaml_file.close
  return yaml
end

#match_beans(opts) ⇒ Object 



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# File 'bin/librato-metrics-tap-jmxbeans', line 21

def match_beans(opts)
  ret = Taps::JMX::connect!(opts[:jmx_host], opts[:jmx_port])
  unless ret
    err "Failed to connect to JMX endpoint"
  end

  unless opts[:bean_name]
    err "Must specify --bean-name when matching bean names"
  end

  beans = get_beans(opts[:bean_name])
  puts beans.join("\n")
end

#publish_beans(publisher, beans, opts) ⇒ Object 



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# File 'bin/librato-metrics-tap-jmxbeans', line 35

def publish_beans(publisher, beans, opts)
  (counters, gauges) = Taps::JMX::retrieve(beans, opts[:ignore_missing])

  r = publisher.post(counters, gauges, opts)
  unless r
    $stderr.puts "ERROR: Failed to publish metrics!"
  end
  return r
end

#publish_loop(opts, publisher, interval, beans) ⇒ Object 



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# File 'bin/librato-metrics-tap-jmxbeans', line 63

def publish_loop(opts, publisher, interval, beans)
  # If --interval or --interval-file has been specified,
  # broadcast every interval seconds. We wait for
  # interval seconds each time to ensure we broadcast
  # on the interval
  #
  # We use a random stagger to ensure that we are measuring and
  # publishing our metrics at a random point within the period. This
  # ensures that multiple entities are not measuring and reporting
  # at the same exact points in time.

  stagger = rand(interval)
  begin
    t = Time.now.tv_sec

    # Floor the time to the current interval
    t2 = (t / interval) * interval

    # Offset by the stagger
    t2 += stagger

    # If our stagger is < interval/2, it is possible that we
    # went back in time. In that case, simply skip another interval
    #
    if t2 <= t
      t2 += interval
    end

    sleep (t2 - t)
    t = Time.now

    # We report our measure time as the nearest interval
    tsecs = ((t.tv_sec + (interval / 2)) / interval) * interval

    publish_beans(publisher, beans, opts.merge(:measure_time => tsecs))
  end while true
end