recipe_definition_dsl_core.rb

#
# Author:: Adam Jacob (<[email protected]>)
# Author:: Christopher Walters (<[email protected]>)
# Copyright:: Copyright (c) 2008, 2009 Opscode, Inc.
# License:: Apache License, Version 2.0
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
# 
#     http://www.apache.org/licenses/LICENSE-2.0
# 
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#

require 'chef/recipe'
require 'chef/resource'
require 'chef/mixin/convert_to_class_name'

class Chef
  module Mixin
    module RecipeDefinitionDSLCore
      
      include Chef::Mixin::ConvertToClassName
      
      def method_missing(method_symbol, *args, &block)
        # If we have a definition that matches, we want to use that instead.  This should
        # let you do some really crazy over-riding of "native" types, if you really want
        # to. 
        if @definitions.has_key?(method_symbol)
          # This dupes the high level object, but we still need to dup the params
          new_def = @definitions[method_symbol].dup
          new_def.params = new_def.params.dup
          new_def.node = @node
          # This sets up the parameter overrides
          new_def.instance_eval(&block) if block
          new_recipe = Chef::Recipe.new(@cookbook_name, @recipe_name, @node, @collection, @definitions, @cookbook_loader)
          new_recipe.params = new_def.params
          new_recipe.params[:name] = args[0]
          new_recipe.instance_eval(&new_def.recipe)
        else
          # Otherwise, we're rocking the regular resource call route.
          method_name = method_symbol.to_s
          rname = convert_to_class_name(method_name)
          
          # If we have a resource like this one, we want to steal its state
          resource = begin
                       args << @collection
                       args << @node
                       Chef::Resource.const_get(rname).new(*args)
                     rescue NameError => e
                       if e.to_s =~ /Chef::Resource/
                         raise NameError, "Cannot find #{rname} for #{method_name}\nOriginal exception: #{e.class}: #{e.message}"
                       else
                         raise e
                       end
                     end
          resource.load_prior_resource
          resource.cookbook_name = @cookbook_name
          resource.recipe_name = @recipe_name
          resource.params = @params
          # Determine whether this resource is being created in the context of an enclosing Provider
          resource.enclosing_provider = self.is_a?(Chef::Provider) ? self : nil
          resource.instance_eval(&block) if block

          @collection.insert(resource)
          resource
        end
      end
      
    end
  end
end