Class: CloudFormationConverger

Inherits:
Object
  • Object
show all
Defined in:
lib/cloudformation_converger.rb

Instance Method Summary collapse

Instance Method Details

#chain_converge(cloudformation_stacks:, input_bindings: nil, strip_extras: false) ⇒ Object 



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# File 'lib/cloudformation_converger.rb', line 6

def chain_converge(cloudformation_stacks:,
                   input_bindings: nil,
                   strip_extras: false)

  all_output_bindings = []
  previous_output_bindings = input_bindings
  cloudformation_stacks.each do |cloudformation_stack|
    previous_output_bindings = converge stack_name: cloudformation_stack[:stack_name],
                                        stack_path: cloudformation_stack[:path_to_stack],
                                        bindings: previous_output_bindings,
                                        strip_extras: strip_extras
    all_output_bindings << previous_output_bindings
  end
  all_output_bindings.inject({}) do |merged_output_bindings, per_stack_output_binding|
    merged_output_bindings.merge(per_stack_output_binding) do |key, oldval, newval|
      STDERR.puts "duplicate value for #{key}: #{oldval} and #{newval}"
    end
  end
end

#converge(stack_name:, stack_path:, bindings: nil, strip_extras: false) ⇒ Object 



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# File 'lib/cloudformation_converger.rb', line 26

def converge(stack_name:,
             stack_path:,
             bindings: nil,
             strip_extras: false)

  cloudformation_client = Aws::CloudFormation::Client.new

  validate_template_response = cloudformation_client.validate_template(template_body: IO.read(stack_path))
  legal_parameters = validate_template_response.parameters.map { | parameter| parameter.parameter_key }

  parameters = []
  unless bindings.nil?
    parameters = convert_hash_to_parameters bindings, legal_parameters, strip_extras
  end

  resource = Aws::CloudFormation::Resource.new(client: cloudformation_client)
  if resource.stacks.find {|stack| stack.name == stack_name }
    stack = resource.stack(stack_name)
    begin
      stack.update(template_body: IO.read(stack_path),
                   capabilities: %w(CAPABILITY_IAM),
                   parameters: parameters)
    rescue Exception => error
      if error.to_s =~ /No updates are to be performed/
        STDERR.puts 'no updates necessary'
        return stack_outputs_hash(stack) if stack.stack_status =~ /COMPLETE/
      else
        raise error
      end
    end

  else
    stack = resource.create_stack(stack_name: stack_name,
                                  template_body: IO.read(stack_path),
                                  capabilities: %w(CAPABILITY_IAM),
                                  parameters: parameters)
  end

  stack.wait_until(max_attempts:360, delay:15) do |stack|
    stack.stack_status =~ /COMPLETE/ or stack.stack_status =~ /FAILED/
  end

  if stack.stack_status =~ /FAILED/ or stack.stack_status =~ /ROLLBACK_COMPLETE/
    raise "#{stack_name} failed to converge: #{stack.stack_status}"
  end

  stack_outputs_hash(stack)
end