Module: CfnDsl::Types

Included in:
AWS::Types, OS::Types
Defined in:
lib/cfndsl/types.rb

Overview

rubocop:disable Metrics/ModuleLength

Class Method Summary collapse

Class Method Details

.included(type_def) ⇒ Object

rubocop:disable Metrics/MethodLength, Metrics/AbcSize, Metrics/PerceivedComplexity, Metrics/CyclomaticComplexity



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# File 'lib/cfndsl/types.rb', line 11

def self.included(type_def)
  types_list = YAML.load(File.open("#{File.dirname(__FILE__)}/#{type_def::TYPE_PREFIX}/types.yaml"))
  type_def.const_set('Types_Internal', types_list)

  # Do a little sanity checking - all of the types referenced in Resources
  # should be represented in Types
  types_list['Resources'].keys.each do |resource_name|
    resource = types_list['Resources'][resource_name]
    resource.values.each do |thing|
      thing.values.each do |type|
        if type.is_a?(Array)
          type.each do |inner_type|
            puts "unknown type #{inner_type}" unless types_list['Types'].key?(inner_type)
          end
        else
          puts "unknown type #{type}" unless types_list['Types'].key?(type)
        end
      end
    end
  end

  # All of the type values should also be references
  types_list['Types'].values do |type|
    if type.respond_to?(:values)
      type.values.each do |tv|
        puts "unknown type #{tv}" unless types_list['Types'].key?(tv)
      end
    end
  end

  classes = {}

  # Go through and declare all of the types first
  types_list['Types'].each_key do |typename|
    if !type_def.const_defined?(typename)
      klass = type_def.const_set(typename, Class.new(type_def::Type))
      classes[typename] = klass
    else
      classes[typename] = type_def.const_get(typename)
    end
  end

  # Now go through them again and define attribute setter methods
  classes.each_pair do |typename, type|
    typeval = types_list['Types'][typename]
    next unless typeval.respond_to?(:each_pair)
    typeval.each_pair do |attr_name, attr_type|
      if attr_type.is_a?(Array)
        klass = type_def.const_get(attr_type[0])
        variable = "@#{attr_name}".to_sym

        method = CfnDsl::Plurals.singularize(attr_name)
        methods = attr_name
        all_methods = CfnDsl.method_names(method) + CfnDsl.method_names(methods)
        type.class_eval do
          all_methods.each do |method_name|
            define_method(method_name) do |value = nil, *rest, &block|
              existing = instance_variable_get(variable)
              # For no-op invocations, get out now
              return existing if value.nil? && rest.empty? && !block

              # We are going to modify the value in some
              # way, make sure that we have an array to mess
              # with if we start with nothing
              existing = instance_variable_set(variable, []) unless existing

              # special case for just a block, no args
              if value.nil? && rest.empty? && block
                val = klass.new
                existing.push val
                value.instance_eval(&block(val))
                return existing
              end

              # Glue all of our parameters together into
              # a giant array - flattening one level deep, if needed
              array_params = []
              if value.is_a?(Array)
                value.each { |x| array_params.push x }
              else
                array_params.push value
              end
              unless rest.empty?
                rest.each do |v|
                  if v.is_a?(Array)
                    array_params += rest
                  else
                    array_params.push v
                  end
                end
              end

              # Here, if we were given multiple arguments either
              # as method [a,b,c], method(a,b,c), or even
              # method( a, [b], c) we end up with
              # array_params = [a,b,c]
              #
              # array_params will have at least one item
              # unless the user did something like pass in
              # a bunch of empty arrays.
              if block
                array_params.each do |array_params_value|
                  value = klass.new
                  existing.push value
                  value.instance_eval(&block(array_params_value)) if block
                end
              else
                # List of parameters with no block -
                # hope that the user knows what he is
                # doing and stuff them into our existing
                # array
                array_params.each do |_|
                  existing.push value
                end
              end
              return existing
            end
          end
        end
      else
        klass = type_def.const_get(attr_type)
        variable = "@#{attr_name}".to_sym

        type.class_eval do
          CfnDsl.method_names(attr_name) do |inner_method|
            define_method(inner_method) do |value = nil, *_rest, &block|
              value ||= klass.new
              instance_variable_set(variable, value)
              value.instance_eval(&block) if block
              value
            end
          end
        end
      end
    end
  end
end