Class: MetriksdReporter::Reporter

Inherits:
Object
  • Object
show all
Defined in:
lib/metriksd_reporter/reporter.rb

Instance Method Summary collapse

Constructor Details

#initialize(options = {}) ⇒ Reporter

Returns a new instance of Reporter.



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# File 'lib/metriksd_reporter/reporter.rb', line 6

def initialize(options = {})
  missing_keys = %w(port host) - options.keys.map(&:to_s)
  unless missing_keys.empty?
    raise ArgumentError, "Missing required options: #{missing_keys * ', '}"
  end

  @port = options[:port]
  @host = options[:host]

  @client_id       = options[:client_id] || "#{Socket.gethostname}:#{$$}"
  @extras          = options[:extras] || {}
  @registry        = options[:registry] || Metriks::Registry.default

  @max_packet_size = options[:max_packet_size] || 1000
  @interval        = options[:interval] || 60
  @interval_offset = options[:interval_offset] || 0
  @flush_delay     = options[:flush_delay] || 0.6

  @on_error        = options[:on_error] || proc { |ex| }
end

Instance Method Details

#append_to_packet(data) ⇒ Object 



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# File 'lib/metriksd_reporter/reporter.rb', line 114

def append_to_packet(data)
  @packet ||= ''
  @packet << data.to_msgpack
  flush_packet_if_full
end

#extract_from_metric(metric, *keys) ⇒ Object 



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# File 'lib/metriksd_reporter/reporter.rb', line 148

def extract_from_metric(metric, *keys)
  h = {}

  keys.flatten.collect do |key|
    name = key.to_s.gsub(/^get_/, '')
    h[name] = metric.send(key)
  end
  
  h
end

#flush ⇒ Object 



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# File 'lib/metriksd_reporter/reporter.rb', line 68

def flush
  write
end

#flush_packet ⇒ Object 



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# File 'lib/metriksd_reporter/reporter.rb', line 127

def flush_packet
  if @packet && @packet.length > 0
    compressed = Snappy.deflate(@packet)

    # Calculate the compression ratio
    @compression_ratio = @packet.length / compressed.length

    # Send the packet
    @socket.send(compressed, 0, @host, @port)
    @packet = ''
  end
end

#flush_packet_if_full ⇒ Object 



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# File 'lib/metriksd_reporter/reporter.rb', line 120

def flush_packet_if_full
  if @packet && @packet.length > 0 && @packet.length > max_packet_size_with_compression_ratio
    flush_packet
    sleep_for_up_to(0.6)
  end
end

#join ⇒ Object 



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# File 'lib/metriksd_reporter/reporter.rb', line 57

def join
  if @thread
    @thread.join
  end
end

#max_packet_size_with_compression_ratio ⇒ Object 



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# File 'lib/metriksd_reporter/reporter.rb', line 140

def max_packet_size_with_compression_ratio
  if @compression_ratio
    @max_packet_size * @compression_ratio * 0.9
  else
    @max_packet_size
  end
end

#restart ⇒ Object 



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# File 'lib/metriksd_reporter/reporter.rb', line 63

def restart
  stop
  start
end

#sleep_for_up_to(duration) ⇒ Object 



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# File 'lib/metriksd_reporter/reporter.rb', line 190

def sleep_for_up_to(duration)
  duration *= rand
  if duration > 0
    sleep(duration)
  end
end

#sleep_until_deadline ⇒ Object 



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# File 'lib/metriksd_reporter/reporter.rb', line 177

def sleep_until_deadline
  # Ensure we round up when we should
  now = Time.now.to_f + @interval_offset

  rounded      = now - (now % @interval)
  next_rounded = rounded + @interval - @interval_offset
  sleep_time   = next_rounded - Time.now.to_f

  if sleep_time > 0
    sleep(sleep_time)
  end
end

#start ⇒ Object 



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# File 'lib/metriksd_reporter/reporter.rb', line 27

def start
  @socket ||= UDPSocket.new

  @thread ||= Thread.new do
    loop do
      sleep_until_deadline

      begin
        write
      rescue Exception => ex
        @on_error[ex] rescue nil
      end
    end
  end
end

#stop ⇒ Object 



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# File 'lib/metriksd_reporter/reporter.rb', line 43

def stop
  if @thread
    @thread.exit
    @thread = nil
  end

  flush

  if @socket
    @socket.close
    @socket = nil
  end
end

#write ⇒ Object 



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# File 'lib/metriksd_reporter/reporter.rb', line 72

def write
  @registry.each do |name, metric|
    case metric
    when Metriks::Meter
      write_metric name, 'meter', metric, [
        :count, :one_minute_rate, :five_minute_rate,
        :fifteen_minute_rate, :mean_rate
      ]
    when Metriks::Counter
      write_metric name, 'counter', metric, [
        :count
      ]
    when Metriks::UtilizationTimer
      write_metric name, 'utilization_timer', metric, [
        :count, :one_minute_rate, :five_minute_rate,
        :fifteen_minute_rate, :mean_rate,
        :min, :max, :mean, :stddev,
        :one_minute_utilization, :five_minute_utilization,
        :fifteen_minute_utilization, :mean_utilization,
      ], [
        :median, :get_95th_percentile
      ]
    when Metriks::Timer
      write_metric name, 'timer', metric, [
        :count, :one_minute_rate, :five_minute_rate,
        :fifteen_minute_rate, :mean_rate,
        :min, :max, :mean, :stddev
      ], [
        :median, :get_95th_percentile
      ]
    when Metriks::Histogram
      write_metric name, 'histogram', metric, [
        :count, :min, :max, :mean, :stddev
      ], [
        :median, :get_95th_percentile
      ]
    end
  end

  flush_packet
end

#write_metric(name, type, metric, keys, snapshot_keys = []) ⇒ Object 



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# File 'lib/metriksd_reporter/reporter.rb', line 159

def write_metric(name, type, metric, keys, snapshot_keys = [])
  message = @extras.merge(
    :client_id => @client_id,
    :time => Time.now.to_i,
    :name => name,
    :type => type
  )

  message.merge!(extract_from_metric(metric, keys))

  unless snapshot_keys.empty?
    snapshot = metric.snapshot
    message.merge!(extract_from_metric(snapshot, snapshot_keys))
  end

  append_to_packet(message)
end