Class: Chef::Provider::AwsCloudwatchAlarm

Inherits:
Chef::Provisioning::AWSDriver::AWSProvider show all
Defined in:
lib/chef/provider/aws_cloudwatch_alarm.rb

Constant Summary

Constants inherited from Chef::Provisioning::AWSDriver::AWSProvider

Chef::Provisioning::AWSDriver::AWSProvider::AWSResource

Instance Attribute Summary

Attributes inherited from Chef::Provisioning::AWSDriver::AWSProvider

#purging

Instance Method Summary collapse

Methods inherited from Chef::Provisioning::AWSDriver::AWSProvider

#action_handler, #converge_by, #region, #whyrun_supported?

Instance Method Details

#create_aws_object ⇒ Object 



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# File 'lib/chef/provider/aws_cloudwatch_alarm.rb', line 6

def create_aws_object
  converge_by "creating cloudwatch alarm #{new_resource.name} in #{region}" do
    new_resource.driver.cloudwatch_client.put_metric_alarm(desired_options)
  end
end

#desired_options ⇒ Object 



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# File 'lib/chef/provider/aws_cloudwatch_alarm.rb', line 26

def desired_options
  @desired_options ||= begin
    # Because an update is a PUT, we must ensure that any properties not specified
    # on the resource that are already present on the object stay the same
    aws_object = new_resource.aws_object
    opts = { alarm_name: new_resource.name }
    %i{namespace metric_name comparison_operator
       evaluation_periods period statistic threshold
       actions_enabled alarm_description unit}.each do |opt|
      if !new_resource.public_send(opt).nil?
        opts[opt] = new_resource.public_send(opt)
      elsif aws_object && !aws_object.public_send(opt).nil?
        opts[opt] = aws_object.public_send(opt)
      end
    end
    if !new_resource.dimensions.nil?
      opts[:dimensions] = new_resource.dimensions
    elsif aws_object && !aws_object.dimensions.nil?
      opts[:dimensions] = aws_object.dimensions.map!(&:to_h)
    end
    # Normally we would just use `lookup_options` here but because these parameters
    # don't necessarily sound like sns topics we manually do it
    %i{insufficient_data_actions ok_actions alarm_actions}.each do |opt|
      if !new_resource.public_send(opt).nil?
        opts[opt] = new_resource.public_send(opt)
        opts[opt].map! do |action|
          if action.is_a?(String) && action !~ /^arn:/
            aws_object = Chef::Resource::AwsSnsTopic.get_aws_object(action, resource: new_resource)
            action = aws_object.attributes["TopicArn"] if aws_object
          end
          action
        end
      elsif aws_object && !aws_object.public_send(opt).nil?
        opts[opt] = aws_object.public_send(opt)
      end
    end
    opts
  end
end

#destroy_aws_object(alarm) ⇒ Object 



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# File 'lib/chef/provider/aws_cloudwatch_alarm.rb', line 20

def destroy_aws_object(alarm)
  converge_by "destroying cloudwatch alarm #{new_resource.name} in #{region}" do
    alarm.delete
  end
end

#update_aws_object(alarm) ⇒ Object 



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# File 'lib/chef/provider/aws_cloudwatch_alarm.rb', line 12

def update_aws_object(alarm)
  if update_required?(alarm)
    converge_by "updating cloudwatch alarm #{new_resource.name} in #{region}" do
      new_resource.driver.cloudwatch_client.put_metric_alarm(desired_options)
    end
  end
end

#update_required?(alarm) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/chef/provider/aws_cloudwatch_alarm.rb', line 66

def update_required?(alarm)
  %i{namespace metric_name comparison_operator
     evaluation_periods period statistic threshold
     actions_enabled alarm_description unit}.each do |opt|
    return true if alarm.public_send(opt) != desired_options[opt]
  end
  unless (Set.new(alarm.dimensions.map(&:to_h)) ^ Set.new(desired_options[:dimensions])).empty?
    return true
  end
  %i{insufficient_data_actions ok_actions alarm_actions}.each do |opt|
    unless (Set.new(alarm.public_send(opt)) ^ Set.new(desired_options[opt])).empty?
      return true
    end
  end
  false
end