Class: CfnGuardian::Tagger

Inherits:
Object
  • Object
show all
Includes:
Logging
Defined in:
lib/cfnguardian/tagger.rb

Instance Method Summary collapse

Methods included from Logging

colors, included, logger, #logger, logger=

Constructor Details

#initialize ⇒ Tagger

Returns a new instance of Tagger.



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# File 'lib/cfnguardian/tagger.rb', line 9

def initialize()
  @client = Aws::CloudWatch::Client.new(max_attempts: 5)
end

Instance Method Details

#get_alarm_tags(alarm_arn) ⇒ Object 



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# File 'lib/cfnguardian/tagger.rb', line 58

def get_alarm_tags(alarm_arn)
  resp = @client.list_tags_for_resource({
    resource_arn: alarm_arn
  })
  return resp.tags
end

#get_tags(alarm, global_tags) ⇒ Object 



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# File 'lib/cfnguardian/tagger.rb', line 46

def get_tags(alarm, global_tags)
  defaults = {
    'guardian:resource:id' => alarm.resource_id,
    'guardian:resource:group' => alarm.group,
    'guardian:alarm:name' => alarm.name,
    'guardian:alarm:metric' => alarm.metric_name,
    'guardian:alarm:severity' => alarm.alarm_action
  }
  tags = global_tags.merge(defaults)
  return alarm.tags.merge(tags)
end

#get_tags_to_delete(current_tags, new_tags) ⇒ Object 



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# File 'lib/cfnguardian/tagger.rb', line 65

def get_tags_to_delete(current_tags, new_tags)
  return current_tags.select {|tag| !new_tags.has_key?(tag.key) && !tag.key.start_with?('aws:') }.map { |tag| tag.key }
end

#tag_alarm(alarm, global_tags = {}) ⇒ Object 



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# File 'lib/cfnguardian/tagger.rb', line 13

def tag_alarm(alarm, global_tags={})
  alarm_arn = CfnGuardian::CloudWatch.get_alarm_arn(alarm)
  
  new_tags = get_tags(alarm, global_tags)
  current_tags = get_alarm_tags(alarm_arn)
  tags_to_delete = get_tags_to_delete(current_tags, new_tags)

  if tags_to_delete.any?
    logger.debug "Removing tags #{tags_to_delete} from alarm #{alarm_arn}"
    @client.untag_resource({
      resource_arn: alarm_arn,
      tag_keys: tags_to_delete
    })
  end

  if tags_changed?(current_tags, new_tags)
    logger.debug "Updating tags on alarm #{alarm_arn}"
    new_tags.delete_if {|key, value| value.include?('?')}
    begin
      alarm_severity = new_tags["guardian:alarm:severity"]
      if alarm_severity.is_a?(Array)
        new_tags["guardian:alarm:severity"] = new_tags["guardian:alarm:severity"].join("/")
      end
        @client.tag_resource({
        resource_arn: alarm_arn,
        tags: new_tags.map {|key,value| {key: key, value: value}}
      })
    rescue Aws::CloudWatch::Errors::InvalidParameterValue => e
      logger.debug "Failed due to invalid character in tags for: #{alarm_arn}"
    end
  end
end

#tags_changed?(current_tags, new_tags) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/cfnguardian/tagger.rb', line 69

def tags_changed?(current_tags, new_tags)
  return tags_to_hash(current_tags) != new_tags
end

#tags_to_hash(tags) ⇒ Object 



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# File 'lib/cfnguardian/tagger.rb', line 73

def tags_to_hash(tags)
  return tags.map {|tag| {tag.key => tag.value} }.reduce(Hash.new, :merge)
end