Class: Metriks::Reporter::LibratoMetrics

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

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(email, token, options = {}) ⇒ LibratoMetrics

Returns a new instance of LibratoMetrics.



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

def initialize(email, token, options = {})
  @email = email
  @token = token

  @prefix = options[:prefix]
  @source = options[:source]

  @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

#prefix ⇒ Object

Returns the value of attribute prefix.



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

def prefix
  @prefix
end

#source ⇒ Object

Returns the value of attribute source.



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

def source
  @source
end

Instance Method Details

#form_data(metrics) ⇒ Object 



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# File 'lib/metriks/reporter/librato_metrics.rb', line 118

def form_data(metrics)
  data = {}

  metrics.each_with_index do |gauge, idx|
    gauge.each do |key, value|
      if value
        data["gauges[#{idx}][#{key}]"] = value.to_s
      end
    end
  end

  data
end

#prepare_metric(base_name, metric, keys, snapshot_keys = []) ⇒ Object 



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# File 'lib/metriks/reporter/librato_metrics.rb', line 132

def prepare_metric(base_name, metric, keys, snapshot_keys = [])
  results = []
  time = @time_tracker.now_floored

  base_name = base_name.to_s.gsub(/ +/, '_')
  if @prefix
    base_name = "#{@prefix}.#{base_name}"
  end

  keys.flatten.each do |key|
    name = key.to_s.gsub(/^get_/, '')
    value = metric.send(key)

    results << {
      :type => "gauge",
      :name => "#{base_name}.#{name}",
      :source => @source,
      :measure_time => time,
      :value => value
    }
  end

  unless snapshot_keys.empty?
    snapshot = metric.snapshot
    snapshot_keys.flatten.each do |key|
      name = key.to_s.gsub(/^get_/, '')
      value = snapshot.send(key)

      results << {
        :type => "gauge",
        :name => "#{base_name}.#{name}",
        :source => @source,
        :measure_time => time,
        :value => value
      }
    end
  end

  results
end

#restart ⇒ Object 



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# File 'lib/metriks/reporter/librato_metrics.rb', line 41

def restart
  stop
  start
end

#start ⇒ Object 



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# File 'lib/metriks/reporter/librato_metrics.rb', line 20

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

      Thread.new do
        begin
          write
        rescue Exception => ex
          @on_error[ex] rescue nil
        end
      end
    end
  end
end

#stop ⇒ Object 



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# File 'lib/metriks/reporter/librato_metrics.rb', line 36

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

#submit(data) ⇒ Object 



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# File 'lib/metriks/reporter/librato_metrics.rb', line 97

def submit(data)
  url = URI.parse('https://metrics-api.librato.com/v1/metrics')
  req = Net::HTTP::Post.new(url.path)
  req.basic_auth(@email, @token)
  req.set_form_data(data)

  http = Net::HTTP.new(url.host, url.port)
  http.verify_mode = OpenSSL::SSL::VERIFY_PEER
  http.use_ssl = true
  store = OpenSSL::X509::Store.new
  store.set_default_paths
  http.cert_store = store

  case res = http.start { |http| http.request(req) }
  when Net::HTTPSuccess, Net::HTTPRedirection
    # OK
  else
    res.error!
  end
end

#write ⇒ Object 



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# File 'lib/metriks/reporter/librato_metrics.rb', line 46

def write
  gauges = []
  @registry.each do |name, metric|
    gauges << case metric
    when Metriks::Meter
      prepare_metric name, metric, [
        :count, :one_minute_rate, :five_minute_rate,
        :fifteen_minute_rate, :mean_rate
      ]
    when Metriks::Counter
      prepare_metric name, metric, [
        :count
      ]
    when Metriks::Gauge
      prepare_metric name, metric, [
        :value
      ]
    when Metriks::UtilizationTimer
      prepare_metric name, 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
      prepare_metric name, metric, [
        :count, :one_minute_rate, :five_minute_rate,
        :fifteen_minute_rate, :mean_rate,
        :min, :max, :mean, :stddev
      ], [
        :median, :get_95th_percentile
      ]
    when Metriks::Histogram
      prepare_metric name, metric, [
        :count, :min, :max, :mean, :stddev
      ], [
        :median, :get_95th_percentile
      ]
    end
  end

  gauges.flatten!

  unless gauges.empty?
    submit(form_data(gauges.flatten))
  end
end