Module: AsCombinedMetrics::Cli::Stats

Defined in:
lib/as-combined-metrics/stats.rb

Instance Method Summary collapse

Instance Method Details

#aggregate_instances_per_as_group(metric) ⇒ Object 



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# File 'lib/as-combined-metrics/stats.rb', line 39

def aggregate_instances_per_as_group(metric)
  logger.progname = "#{Module.nesting.first.to_s} #{__method__}"
  logger.info { set_color "Aggregating metrics accross instances for autoscale group: #{@config[:autoscale_group_name]}" , :white}
  begin

    instances =  @as.describe_auto_scaling_groups({auto_scaling_group_names: [@config[:autoscale_group_name]], max_records: 1}).auto_scaling_groups.first.instances.collect {|i| i[:instance_id]}

    logger.info { set_color "Found #{instances.size} Instances for autoscale group: #{@config['autoscale_group_name']}", :magenta }
    
    instances_aggregated_data = []
    
    metric[:dimensions] = [{name: "InstanceId"}]

    instances.each do |instance_id|
      metric[:dimensions][0][:value] = instance_id

      logger.info {"aggregated metric: #{metric}"}
      metric_result = fetch_metric(metric)

      logger.info { set_color "Metric result: #{metric_result}", :bold }

      if metric_result == -1
        instances_aggregated_data << metric_result
        break
        return # check removal of break
      else
        instances_aggregated_data << metric_result
      end
    end

    logger.info { "Instances_aggregated_data: #{instances_aggregated_data}"  }
    
    if !instances_aggregated_data.empty?
      case metric[:statistics][0].downcase
      when 'maximum'
        logger.info { set_color "Instances_aggregated_data [Maximum]: #{instances_aggregated_data.max}", :yellow }
        instances_aggregated_data.max
      when 'minimum'
        logger.info { set_color "Instances_aggregated_data [Minimum]: #{instances_aggregated_data.min}", :yellow }
        instances_aggregated_data.min
      else
        avg_array(instances_aggregated_data)
      end
    else
      # Do not scale down - we don't have all the metric data to scale down
    end
  rescue Exception => e
    logger.info { set_color "Error aggregating metrics #{e.message}", :red }
  end
end

#avg_array(data) ⇒ Object 



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# File 'lib/as-combined-metrics/stats.rb', line 90

def avg_array(data)
  logger.progname = "#{Module.nesting.first.to_s} #{__method__}"

  avg = (data.inject {|sum, i| sum + i }) / data.size
  self.logger.info { set_color "Instances_aggregated_data [Average]: #{avg.round}", :white }
  avg.round 
end

#check_combined_metrics(mode) ⇒ Object 



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# File 'lib/as-combined-metrics/stats.rb', line 2

def check_combined_metrics(mode)
  logger.progname = "#{Module.nesting.first.to_s} #{__method__}"

  logger.info { set_color "Checking combined metrics for #{mode}:", :white }
  
  # prepare an array to hold a true / false result for each metric
  results_array = []
  
  # checking each metric by its comparison operator for true / flase
  @combined_metrics.each do |name, values|
    # The line below checks => measure comparison operator value (a <= b) without the use of eval! (it turn the string into evalutation)
    # measure.method(b['comparison_operator']).(threshold)
    if values[:measure] == -1
      evaluation = false
    else
      evaluation = values[:measure].method(values[:comparison_operator]).(values[:threshold])
    end
    results_array << evaluation
    logger.info { set_color "Results for combined metrics for #{name} with #{values}: #{results_array.last}", :magenta }
  end

  # a short hand if statement =>  if all array elements true set combined_metric_value to 1 else to 0
  case mode 
  when :ScaleIn then
    results_array.all? ?  combined_metric_value = 1 :  combined_metric_value  = 0
  when :ScaleOut then
    results_array.any? ?  combined_metric_value = 1 :  combined_metric_value  = 0
  else
    logger.fatal { set_color "Could not find mode #{mode} - check the config file, exiting now...", :red }
    exit
  end
    
  logger.info { set_color "Combined results of #{results_array} for #{mode} is: #{combined_metric_value}", :magenta }

  return combined_metric_value
end