Module: AsCombinedMetrics::Cli::CloudWatch

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

Instance Method Summary collapse

Instance Method Details

#fetch_metric(metric) ⇒ Object 



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# File 'lib/as-combined-metrics/cloudwatch.rb', line 12

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

  # Read from CloudWatch  
  data = {
      :start_time => (Time.now.utc - options[:period]).iso8601,
      :end_time   => (Time.now.utc).iso8601,
      :period     => options[:period]
  }

  # # removing the keys that are not used in fetch metric 
  metric = metric.merge(data).reject { |k,v| [:comparison_operator, :threshold, :aggregate_as_group].include? k }
  
  logger.info { set_color "Polling data for metric: #{metric[:metric_name]}", :white }
  logger.info { "Metric info: #{metric}" }
  
  begin
    result = @cw.get_metric_statistics(metric).to_hash
  rescue Exception => e
    logger.error { set_color "An error occured #{e}, SDK will retry", :red }
  end

  if result[:datapoints].empty?
    logger.info { set_color "No datapoints found for #{metric[:metric_name]} - Will publish a value of 0 (Don't DownScale) to CloudWatch", :red }
    logger.info { "Result: #{result}" }
    return -1
  else
    datapoint = result[:datapoints][0][metric[:statistics][0].downcase.to_sym]
    logger.info { set_color "Result: #{datapoint} #{result[:datapoints][0][:unit]}", :white }
    datapoint
  end
end

#publish_metric(mode, asg, combined_metric_value) ⇒ Object 



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# File 'lib/as-combined-metrics/cloudwatch.rb', line 45

def publish_metric(mode, asg, combined_metric_value)
  logger.progname = "#{Module.nesting.first.to_s} #{__method__}"

  cw_options = {
    namespace: 'combined_metrics',
    metric_data: [
      metric_name: combined_metrics_name(mode),
       dimensions: [{
        name: 'AutoScalingGroupName',
        value: asg
      }],
      value: combined_metric_value,
      unit: 'None'
    ]
  }
  logger.info { set_color "Options to be sent to cloudwatch: #{cw_options}", :white }
  
  begin
    if options[:dryrun]
      logger.info { set_color "DryRun! Not Publishing Combined Metrics to CloudWatch...", :white }
    else
      logger.info { set_color "Publishing Combined Metrics to CloudWatch...", :white }
      @cw.put_metric_data(cw_options)
    end
  rescue Exception => e
    logger.error { set_color "An error occured #{e}, SDK will retry up to 3 times", :red }
  end
end

#set_default_options(hash, member) ⇒ Object 



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# File 'lib/as-combined-metrics/cloudwatch.rb', line 3

def set_default_options(hash, member)
  logger.progname = "#{Module.nesting.first.to_s} #{__method__}"
  if hash[member] && !hash[member].nil?
    default = hash[member]
  else
    default =  self.config["default_options"][member.to_s.gsub("_", "-")] if !self.config["default_options"][member.to_s.gsub("_", "-")].nil?
  end
end