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#
# Author:: Adam Jacob (<adam@opscode.com>)
# Author:: Christopher Walters (<cw@opscode.com>)
# Author:: Daniel DeLeo (<dan@opscode.com>)
# Copyright:: Copyright (c) 2008-2012 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/resource'
class Chef
class Resource
# == Chef::Resource::LWRPBase
# Base class for LWRP resources. Adds DSL sugar on top of Chef::Resource,
# so attributes, default action, etc. can be defined with pleasing syntax.
class LWRPBase < Resource
NULL_ARG = Object.new
extend Chef::Mixin::ConvertToClassName
extend Chef::Mixin::FromFile
# Evaluates the LWRP resource file and instantiates a new Resource class.
def self.build_from_file(cookbook_name, filename, run_context)
rname = filename_to_qualified_string(cookbook_name, filename)
# Add log entry if we override an existing light-weight resource.
class_name = convert_to_class_name(rname)
if Resource.const_defined?(class_name, false)
old_class = Resource.send(:remove_const, class_name)
# CHEF-3432 -- Chef::Resource keeps a list of subclasses; need to
# remove old ones from the list when replacing.
resource_classes.delete(old_class)
Chef::Log.info("#{class_name} light-weight resource already initialized -- overriding!")
end
resource_class = Class.new(self)
resource_class.resource_name = rname
resource_class.run_context = run_context
resource_class.class_from_file(filename)
Chef::Resource.const_set(class_name, resource_class)
Chef::Log.debug("Loaded contents of #{filename} into a resource named #{rname} defined in Chef::Resource::#{class_name}")
resource_class
end
# Set the resource snake_case name. Should only be called via
# build_from_file.
def self.resource_name=(resource_name)
@resource_name = resource_name
end
# Returns the resource snake_case name
def self.resource_name
@resource_name
end
# Define an attribute on this resource, including optional validation
# parameters.
def self.attribute(attr_name, validation_opts={})
# Ruby 1.8 doesn't support default arguments to blocks, but we have to
# use define_method with a block to capture +validation_opts+.
# Workaround this by defining two methods :(
class_eval(<<-SHIM, __FILE__, __LINE__)
def #{attr_name}(arg=nil)
_set_or_return_#{attr_name}(arg)
end
SHIM
define_method("_set_or_return_#{attr_name.to_s}".to_sym) do |arg|
set_or_return(attr_name.to_sym, arg, validation_opts)
end
end
# Sets the default action
def self.default_action(action_name=NULL_ARG)
unless action_name.equal?(NULL_ARG)
valid_actions.push(action_name)
@default_action = action_name
end
@default_action
end
# Adds +action_names+ to the list of valid actions for this resource.
def self.actions(*action_names)
valid_actions.push(*action_names)
end
def self.valid_actions
@valid_actions ||= []
end
# Set the run context on the class. Used to provide access to the node
# during class definition.
def self.run_context=(run_context)
@run_context = run_context
end
def self.run_context
@run_context
end
def self.node
run_context.node
end
# Default initializer. Sets the default action and allowed actions.
def initialize(name, run_context=nil)
super(name, run_context)
@resource_name = self.class.resource_name.to_sym
@action = self.class.default_action
allowed_actions.push(self.class.valid_actions).flatten!
end
end
end
end
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