Class: Metriks::Reporter::Logger

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

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(options = {}) ⇒ Logger

Returns a new instance of Logger.



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# File 'lib/metriks/reporter/logger.rb', line 8

def initialize(options = {})
  @logger    = options[:logger]    || ::Logger.new(STDOUT)
  @log_level = options[:log_level] || ::Logger::INFO
  @prefix    = options[:prefix]    || 'metriks:'

  @registry     = options[:registry] || Metriks::Registry.default
  @time_tracker = Metriks::TimeTracker.new(options[:interval] || 60)
  @on_error     = options[:on_error] || proc { |ex| }
end

Instance Attribute Details

#log_level ⇒ Object

Returns the value of attribute log_level.



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# File 'lib/metriks/reporter/logger.rb', line 6

def log_level
  @log_level
end

#logger ⇒ Object

Returns the value of attribute logger.



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# File 'lib/metriks/reporter/logger.rb', line 6

def logger
  @logger
end

#prefix ⇒ Object

Returns the value of attribute prefix.



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# File 'lib/metriks/reporter/logger.rb', line 6

def prefix
  @prefix
end

Instance Method Details

#extract_from_metric(metric, *keys) ⇒ Object 



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# File 'lib/metriks/reporter/logger.rb', line 94

def extract_from_metric(metric, *keys)
  keys.flatten.collect do |key|
    name = key.to_s.gsub(/^get_/, '')
    [ { name => metric.send(key) } ]
  end
end

#flush ⇒ Object 



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# File 'lib/metriks/reporter/logger.rb', line 42

def flush
  if !@last_write || @last_write.min != Time.now.min
    write
  end
end

#format_message(args) ⇒ Object 



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# File 'lib/metriks/reporter/logger.rb', line 119

def format_message(args)
  args.map do |arg|
    case arg
    when Hash then arg.map { |name, value| "#{name}=#{format_message([value])}" }
    when Array then format_message(arg)
    else arg
    end
  end.join(' ')
end

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



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# File 'lib/metriks/reporter/logger.rb', line 101

def log_metric(name, type, metric, keys, snapshot_keys = [])
  message = []

  message << @prefix if @prefix
  message << { :time => Time.now.to_i }

  message << { :name => name }
  message << { :type => type }
  message += extract_from_metric(metric, keys)

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

  @logger.add(@log_level, format_message(message))
end

#restart ⇒ Object 



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# File 'lib/metriks/reporter/logger.rb', line 37

def restart
  stop
  start
end

#start ⇒ Object 



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# File 'lib/metriks/reporter/logger.rb', line 18

def start
  @thread ||= Thread.new do
    loop do
      @time_tracker.sleep

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

#stop ⇒ Object 



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# File 'lib/metriks/reporter/logger.rb', line 32

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

#write ⇒ Object 



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# File 'lib/metriks/reporter/logger.rb', line 48

def write
  @last_write = Time.now

  @registry.each do |name, metric|
    case metric
    when Metriks::Meter
      log_metric name, 'meter', metric, [
        :count, :one_minute_rate, :five_minute_rate,
        :fifteen_minute_rate, :mean_rate
      ]
    when Metriks::Counter
      log_metric name, 'counter', metric, [
        :count
      ]
    when Metriks::Gauge
      log_metric name, 'gauge', metric, [
        :value
      ]
    when Metriks::UtilizationTimer
      log_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
      log_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
      log_metric name, 'histogram', metric, [
        :count, :min, :max, :mean, :stddev
      ], [
        :median, :get_95th_percentile
      ]
    end
  end
end