Module: LanGrove::LogMonitor::Sampler

Defined in:
lib/langrove/ext/log_monitor.rb

Class Method Summary collapse

Class Method Details

.init(root) ⇒ Object 



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# File 'lib/langrove/ext/log_monitor.rb', line 9

def init( root )

  return if @initialized

  @root = root

  @root.logger.debug "#{self}.init( #{root} )"

  @root.metrix.register_sampler( 

    :type => :handler, 
    :sampler => self,
    :accumulator => proc { |component_type, component, state_doc|

      #
      # The component will only be sampled 
      # if it is a LogMonitor
      #

      self.sample_accumulate( 

        component_type, component, state_doc 

      ) if component.respond_to?( :log_monitor_event )

    }

  )

  @initialized = true

  reset

  return self

end

.reset ⇒ Object 



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# File 'lib/langrove/ext/log_monitor.rb', line 174

def reset

  #
  # This may be quite nasty to the garbage collector...
  # 

  @counters = {

    :count => 0,

    #
    # current state
    #
    :current_success => 0,
    :current_fail  => 0,

    #
    # ever succeeded
    #
    :success_ever => 0,
    :success_never => 0,

    #
    # age in seconds of each success
    #
    :success_age => [],
    :last_run_age => [],

    #
    # known errors 
    #
    :known_errors => {},
    :known_errors_instance => 0,
    :known_errors_total => 0,    # includes repeat count

    #
    # unknown errors
    #
    :unknown_errors => {},
    :unknown_errors_instance => 0,
    :unknown_errors_total => 0


  }

end

.sample_accumulate(component_type, component, state_doc) ⇒ Object 



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# File 'lib/langrove/ext/log_monitor.rb', line 46

def sample_accumulate( component_type, component, state_doc )

  #@root.logger.debug "#{self}.sample_accumulate( #{component_type}, #{component}, #{state_doc} )"

  @name = component.class.to_s.split(' ')[0]
  
  @counters[:count] += 1

  if component_type == :handler

    if component.capsule['success']

      @counters[:current_success] += 1

    else 

      @counters[:current_fail] += 1

    end

    now = Time.now.to_i

    if component.capsule['success_at']

      @counters[:success_ever] += 1

      at = component.capsule['success_at'].strftime( '%s' )

      @counters[:success_age] << now - at.to_i

    else 

      @counters[:success_never] += 1

    end

    if component.capsule['last_ran_at']

      at = component.capsule['last_ran_at'].strftime( '%s' )

      @counters[:last_run_age] << now - at.to_i

    end

    if component.capsule['known_errors']

      component.capsule['known_errors'].each do |k,v|

        if @counters[:known_errors][k].nil?

          @counters[:known_errors][k] = 1

        else 

          @counters[:known_errors][k] += 1

        end

        @counters[:known_errors_instance] += 1
        @counters[:known_errors_total] += v

      end

    end

    if component.capsule['unknown_errors']

      component.capsule['unknown_errors'].each do |k,v|

        if @counters[:unknown_errors][k].nil?

          @counters[:unknown_errors][k] = 1

        else 

          @counters[:unknown_errors][k] += 1

        end

        @counters[:unknown_errors_instance] += 1
        @counters[:unknown_errors_total] += v

      end

    end

  end

end

.sample_collate(component_type, state_doc) ⇒ Object 



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# File 'lib/langrove/ext/log_monitor.rb', line 136

def sample_collate( component_type, state_doc )

  #@root.logger.debug "#{self}.sample_collate( #{component_type}, #{state_doc} )"

  success_age = 0.0
  @counters[:success_age].each { |v| success_age += v }

  last_run_age = 0.0
  @counters[:last_run_age].each { |v| last_run_age += v }

  state_doc[ @name ] = {

    :count => @counters[:count],

    :current_success => @counters[:current_success],
    :current_fail => @counters[:current_fail],

    :success_ever => @counters[:success_ever],
    :success_never => @counters[:success_never],

    :avg_success_age => success_age  / @counters[:success_age].length,
    :age_last_run_age => last_run_age  / @counters[:last_run_age].length,

    :known_errors_instance => @counters[:known_errors_instance],
    :known_errors_total => @counters[:known_errors_total],

    :unknown_errors_instance => @counters[:unknown_errors_instance],
    :unknown_errors_total => @counters[:unknown_errors_total],

    :known_errors => @counters[:known_errors],
    :unknown_errors => @counters[:unknown_errors],

  }

  reset 

end