Class: LogStash::Codecs::Graphite

Inherits:
Base
  • Object
show all
Defined in:
lib/logstash/codecs/graphite.rb

Overview

This codec will encode and decode Graphite formated lines.

Constant Summary collapse

EXCLUDE_ALWAYS = 
[ "@timestamp", "@version" ]
DEFAULT_METRICS_FORMAT = 
"*"
METRIC_PLACEHOLDER = 
"*"

Instance Method Summary collapse

Constructor Details

#initialize(params = {}) ⇒ Graphite

Returns a new instance of Graphite.



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# File 'lib/logstash/codecs/graphite.rb', line 46

def initialize(params={})
  super(params)
  @lines = LogStash::Codecs::Line.new
end

Instance Method Details

#decode(data) ⇒ Object 



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# File 'lib/logstash/codecs/graphite.rb', line 52

def decode(data)
  @lines.decode(data) do |event|
    name, value, time = event.get("message").split(" ")
    yield LogStash::Event.new(name => value.to_f, LogStash::Event::TIMESTAMP => LogStash::Timestamp.at(time.to_i))
  end # @lines.decode
end

#encode(event) ⇒ Object 



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# File 'lib/logstash/codecs/graphite.rb', line 69

def encode(event)
  # Graphite message format: metric value timestamp\n

  messages = []
  timestamp = event.sprintf("%{+%s}")
  @metrics_format = event.sprintf(@metrics_format)

  if @fields_are_metrics
    @logger.debug("got metrics event", :metrics => event.to_hash)
    event.to_hash.each do |metric,value|
      next if EXCLUDE_ALWAYS.include?(metric)
      next unless @include_metrics.empty? || @include_metrics.any? { |regexp| metric.match(regexp) }
      next if @exclude_metrics.any? {|regexp| metric.match(regexp)}
      messages << "#{construct_metric_name(metric)} #{event.sprintf(value.to_s).to_f} #{timestamp}"
    end # data.to_hash.each
  else
    @metrics.each do |metric, value|
      @logger.debug("processing", :metric => metric, :value => value)
      metric = event.sprintf(metric)
      next unless @include_metrics.any? {|regexp| metric.match(regexp)}
      next if @exclude_metrics.any? {|regexp| metric.match(regexp)}
      messages << "#{construct_metric_name(event.sprintf(metric))} #{event.sprintf(value).to_f} #{timestamp}"
    end # @metrics.each
  end # if @fields_are_metrics

  if messages.empty?
    @logger.debug("Message is empty, not emiting anything.", :messages => messages)
  else
    message = messages.join(NL) + NL
    @logger.debug("Emiting carbon messages", :messages => messages)

    @on_event.call(event, message)
  end # if messages.empty?
end