Class: Fluent::BufferedMetricsOutput

Inherits:
BufferedOutput
  • Object
show all
Defined in:
lib/fluent/plugin/out_buffered_metrics.rb

Instance Method Summary collapse

Constructor Details

#initialize ⇒ BufferedMetricsOutput

Returns a new instance of BufferedMetricsOutput.



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# File 'lib/fluent/plugin/out_buffered_metrics.rb', line 27

def initialize
  super
  require 'fluent/metrics_backends'
end

Instance Method Details

#configure(conf) ⇒ Object 



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# File 'lib/fluent/plugin/out_buffered_metrics.rb', line 32

def configure(conf)
  super(conf) {
    @url = conf.delete('url')
    @http_headers = conf.delete('http_headers')
    @metrics_backend = conf.delete('metrics_backend')
    @prefix = conf.delete('prefix')
    @sum_maps = conf.delete('sum_maps')
    @sum_defaults = conf.delete('sum_defaults')
    @metric_maps = conf.delete('metric_maps')
    @metric_defaults = conf.delete('metric_defaults')
  }

  @base_entry = {}

  unless @prefix.nil?

    begin
      @prefix = eval(@prefix)
    rescue Exception
      @prefix = eval('"'+@prefix+'"')
    end

    @base_entry['prefix'] = @prefix unless @prefix.empty?

  end

  @sum_maps.each do |k,v|
    @sum_maps[k] = [ v ] unless v.is_a?(Array)
  end

  @metric_maps.each do |k,v|
    @metric_maps[k] = [ v ] unless v.is_a?(Array)
  end

  begin
    backend_name = @metrics_backend
    @metrics_backend = Object.const_get(
      sprintf('Fluent::MetricsBackend%s',backend_name.capitalize)
    ).new(@url,@http_headers)

  rescue => e
    log.error "Error initializing metrics backend #{backend_name}"
    raise e
  end

end

#derive_metrics(chunk) ⇒ Object 



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# File 'lib/fluent/plugin/out_buffered_metrics.rb', line 83

def derive_metrics(chunk)
  # The default timestamp really needs to set from the chunk
  # metadata.  However, there is no way to do this prior to
  # v0.14.  Putting the the VERSION conditional settitng, but
  # I don't really have a way to test it, at the moment.

  if chunk.methods.include?(/metadata/)
    # This should work for v0.14 and above and is preferable.
    timestamp = chunk.metadata.timekey.to_f
  else
    timestamp = Time.now.to_f
  end

  sum_data = {}
  metric_data = {}

  chunk.msgpack_each do |event|
    @sum_maps.each do |k,v|

      begin
        incr = eval(k)
        if incr.is_a?(Numeric)
          v.each do |e|
            begin
              name = eval(e)
            rescue Exception
              name = eval('"'+e+'"')
            end
            sum_data[name] ||= 0
            sum_data[name] += incr
          end
        end
      rescue Exception => e
        log.error "Failed to process sum_map (#{k},#{v}) for event: #{event}: #{e.trace}"
      end

    end

    @metric_maps.each do |k,v|

      begin
        if eval(k)
          v.each do |e|
            val = eval(e)
            if val.is_a?(Hash) and not val.empty?
              @metrics_backend.buffer_append_entry(
                @base_entry.merge(val),
                event['time']
              )
            end
          end
        end
      rescue Exception => e
        log.error "Failed to process metric_map (#{k},#{v}) for event: #{event}: #{e.trace}"
      end

    end

  end

  @sum_defaults.each do |e|
    sum_data[e['name']] = e['value'] unless sum_data.key?(e['name'])
  end

  @metrics_backend.buffer_append_array_of_hashes(
    sum_data.map {|name,value|
      @base_entry.merge({ 'name' => name, 'value' => value, 'time' => timestamp })
    }
  )

  @metrics_backend.buffer_append_array_of_hashes(
     @metric_defaults.map {|e|
       @base_entry.merge(e).merge({'time' => timestamp}) unless metric_data.key?(e['name'])
     }
  )

end

#format(tag, time, record) ⇒ Object 



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# File 'lib/fluent/plugin/out_buffered_metrics.rb', line 79

def format(tag, time, record)
  { 'tag' => tag, 'time' => time, 'record' => record }.to_msgpack
end

#write(chunk) ⇒ Object 



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# File 'lib/fluent/plugin/out_buffered_metrics.rb', line 161

def write(chunk)

  # The superclass BufferedOutput provides the retry logic.  If the
  # buffer already has content this must be a retry after a failed
  # flush, so don't re-scan the chunk for the metrics.
  derive_metrics(chunk) unless @metrics_backend.buffer?
  @metrics_backend.buffer_flush if @metrics_backend.buffer?

end