Class: Takwimu::Instruments::PassengerStats

Inherits:
Object
  • Object
show all
Defined in:
lib/takwimu/instruments/passenger_stats.rb

Constant Summary collapse

PROCESS_ELEMENTS = 
%w(concurrency sessions busyness processed rss pss private_dirty swap real_memory cpu vmsize)

Instance Method Summary collapse

Constructor Details

#initialize(sample_rate = nil) ⇒ PassengerStats

Returns a new instance of PassengerStats.



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# File 'lib/takwimu/instruments/passenger_stats.rb', line 9

def initialize(sample_rate=nil)
end

Instance Method Details

#instrument!(state, counters, gauges, timers) ⇒ Object 



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# File 'lib/takwimu/instruments/passenger_stats.rb', line 54

def instrument!(state, counters, gauges, timers)
  Takwimu.config.logger.debug "Takwimu.PassengerStats.instrument!" if Takwimu.config.logger
  stats = self.json_stats

  Takwimu.config.logger.debug "Takwimu.PassengerStats.instrument! Stats - #{stats.inspect}" if Takwimu.config.logger

  return if stats.empty?

  gauges[:"passenger.process_count"] = stats[:process_count]
  gauges[:"passenger.max_pool_size"] = stats[:max_pool_size]
  gauges[:"passenger.capacity_used"] = stats[:capacity_used]
  gauges[:"passenger.top_level_queue"] = stats[:top_level_queue]

  stats[:processes].each_with_index do |process, i|
    PROCESS_ELEMENTS.each do |element|
      gauges[:"passenger.process.#{i}.#{element}"]  = process[element.to_sym]
    end
  end

end

#json_stats ⇒ Object 



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# File 'lib/takwimu/instruments/passenger_stats.rb', line 21

def json_stats
  doc = Nokogiri::XML(`sudo /usr/sbin/passenger-status --show=xml`)
  Takwimu.config.logger.error "Takwimu.json_stats - doc.blank? = #{doc.blank?}" if Takwimu.config.logger
  return {} if doc.blank?

  stats = {
      process_count: doc.xpath('//process_count').children[0].to_s,
      max_pool_size: doc.xpath('//max').children[0].to_s,
      capacity_used: doc.xpath('//capacity_used').children[0].to_s,
      top_level_queue: doc.xpath('//get_wait_list_size').children[0].to_s,
      processes: []
  }

  doc.xpath('//supergroups')[0].xpath('./supergroup').each do |supergroup|
    supergroup.xpath('./group/processes/process').each_with_index do |process, i|

      process_element = {}
      PROCESS_ELEMENTS.each do |element|
        process_element[element.to_sym] = process.xpath("./#{element}").children[0].to_s
      end
      stats[:processes][i] = process_element
    end
  end

  return stats
rescue StandardError => e
  #raise e unless e.message =~ /nil/
  #raise e unless e.message =~ /stats/
  Takwimu.config.logger.error "Takwimu.PassengerStats #{e.message}" if Takwimu.config.logger
  Takwimu.config.logger.error "Takwimu.PassengerStats #{e.backtrace.inspect}" if Takwimu.config.logger
  return {}
end

#start!(state) ⇒ Object 



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# File 'lib/takwimu/instruments/passenger_stats.rb', line 16

def start!(state)
  require 'nokogiri'
  require 'open-uri'
end

#valid? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/takwimu/instruments/passenger_stats.rb', line 12

def valid?
  defined?(PhusionPassenger)
end