Class: Chef::Provisioning::AWSDriver::AWSTagger

Inherits:
Object
  • Object
show all
Extended by:
Forwardable
Defined in:
lib/chef/provisioning/aws_driver/aws_tagger.rb

Overview

itself. Fill in the hook methods so it knows how to tag itself.

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(tagging_strategy, action_handler) ⇒ AWSTagger

Returns a new instance of AWSTagger.



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# File 'lib/chef/provisioning/aws_driver/aws_tagger.rb', line 11

def initialize(tagging_strategy, action_handler)
  @tagging_strategy = tagging_strategy
  @action_handler = action_handler
end

Instance Attribute Details

#action_handler ⇒ Object (readonly)

Returns the value of attribute action_handler.



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# File 'lib/chef/provisioning/aws_driver/aws_tagger.rb', line 9

def action_handler
  @action_handler
end

Instance Method Details

#converge_tags ⇒ Object 



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# File 'lib/chef/provisioning/aws_driver/aws_tagger.rb', line 18

def converge_tags
  if desired_tags.nil?
    Chef::Log.debug "aws_tags not provided, nothing to converge"
    return
  end

  # Duplication and normalization
  # ::Aws::EC2::Errors::InvalidParameterValue: Tag value cannot be null. Use empty string instead.
  n_desired_tags = Hash[desired_tags.map {|k,v| [k.to_s, v.to_s]}]
  n_current_tags = Hash[current_tags.map {|k,v| [k.to_s, v.to_s]}]

  tags_to_set = n_desired_tags.reject {|k,v| n_current_tags[k] && n_current_tags[k] == v}
  tags_to_delete = n_current_tags.keys - n_desired_tags.keys
  # We don't want to delete `Name`, just all other tags
  # Tag keys and values are case sensitive - `Name` is special because it
  # shows as the name in the console
  tags_to_delete.delete('Name')

  # Tagging frequently fails so we retry with an exponential backoff, a maximum of 10 seconds
  Retryable.retryable(
    :tries => 20,
    :sleep => lambda { |n| [2**n, 10].min },
    :on => [AWS::Errors::Base, Aws::Errors::ServiceError,]
  ) do |retries, exception|
    if retries > 0
      Chef::Log.info "Retrying the tagging, previous try failed with #{exception.inspect}"
    end
    unless tags_to_set.empty?
      action_handler.perform_action "creating tags #{tags_to_set}" do
        set_tags(tags_to_set)
      end
      tags_to_set = []
    end
    unless tags_to_delete.empty?
      action_handler.perform_action "deleting tags #{tags_to_delete}" do
        delete_tags(tags_to_delete)
      end
      tags_to_delete = []
    end
  end
end