diff options
Diffstat (limited to 'lib/chef')
| -rw-r--r-- | lib/chef/constants.rb | 27 | ||||
| -rw-r--r-- | lib/chef/delayed_evaluator.rb | 21 | ||||
| -rw-r--r-- | lib/chef/exceptions.rb | 1 | ||||
| -rw-r--r-- | lib/chef/mixin/params_validate.rb | 192 | ||||
| -rw-r--r-- | lib/chef/property.rb | 539 | ||||
| -rw-r--r-- | lib/chef/resource.rb | 371 |
6 files changed, 967 insertions, 184 deletions
diff --git a/lib/chef/constants.rb b/lib/chef/constants.rb new file mode 100644 index 0000000000..d39ce4c68d --- /dev/null +++ b/lib/chef/constants.rb @@ -0,0 +1,27 @@ +# +# Author:: John Keiser <jkeiser@chef.io> +# Copyright:: Copyright (c) 2015 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. + +class Chef + NOT_PASSED = Object.new + def NOT_PASSED.to_s + "NOT_PASSED" + end + def NOT_PASSED.inspect + to_s + end + NOT_PASSED.freeze +end diff --git a/lib/chef/delayed_evaluator.rb b/lib/chef/delayed_evaluator.rb new file mode 100644 index 0000000000..9f18a53445 --- /dev/null +++ b/lib/chef/delayed_evaluator.rb @@ -0,0 +1,21 @@ +# +# Author:: John Keiser <jkeiser@chef.io> +# Copyright:: Copyright (c) 2015 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. + +class Chef + class DelayedEvaluator < Proc + end +end diff --git a/lib/chef/exceptions.rb b/lib/chef/exceptions.rb index e7da6fc110..d5c4c4832b 100644 --- a/lib/chef/exceptions.rb +++ b/lib/chef/exceptions.rb @@ -103,6 +103,7 @@ class Chef class ProviderNotFound < RuntimeError; end NoProviderAvailable = ProviderNotFound class VerificationNotFound < RuntimeError; end + class MultipleIdentityError < RuntimeError; end # Can't find a Resource of this type that is valid on this platform. class NoSuchResourceType < NameError diff --git a/lib/chef/mixin/params_validate.rb b/lib/chef/mixin/params_validate.rb index 4ab016249f..322caea474 100644 --- a/lib/chef/mixin/params_validate.rb +++ b/lib/chef/mixin/params_validate.rb @@ -15,11 +15,11 @@ # See the License for the specific language governing permissions and # limitations under the License. -class Chef - NOT_PASSED = Object.new +require 'chef/constants' +require 'chef/property' +require 'chef/delayed_evaluator' - class DelayedEvaluator < Proc - end +class Chef module Mixin module ParamsValidate @@ -34,20 +34,55 @@ class Chef # Would raise an exception if the value of :one above is not a kind_of? string. Valid # map options are: # - # :default:: Sets the default value for this parameter. - # :callbacks:: Takes a hash of Procs, which should return true if the argument is valid. - # The key will be inserted into the error message if the Proc does not return true: - # "Option #{key}'s value #{value} #{message}!" - # :kind_of:: Ensure that the value is a kind_of?(Whatever). If passed an array, it will ensure - # that the value is one of those types. - # :respond_to:: Ensure that the value has a given method. Takes one method name or an array of - # method names. - # :required:: Raise an exception if this parameter is missing. Valid values are true or false, - # by default, options are not required. - # :regex:: Match the value of the parameter against a regular expression. - # :equal_to:: Match the value of the parameter with ==. An array means it can be equal to any - # of the values. + # @param opts [Hash<Symbol,Object>] Validation opts. + # @option opts [Object,Array] :is An object, or list of + # objects, that must match the value using Ruby's `===` operator + # (`opts[:is].any? { |v| v === value }`). (See #_pv_is.) + # @option opts [Object,Array] :equal_to An object, or list + # of objects, that must be equal to the value using Ruby's `==` + # operator (`opts[:is].any? { |v| v == value }`) (See #_pv_equal_to.) + # @option opts [Regexp,Array<Regexp>] :regex An object, or + # list of objects, that must match the value with `regex.match(value)`. + # (See #_pv_regex) + # @option opts [Class,Array<Class>] :kind_of A class, or + # list of classes, that the value must be an instance of. (See + # #_pv_kind_of.) + # @option opts [Hash<String,Proc>] :callbacks A hash of + # messages -> procs, all of which match the value. The proc must + # return a truthy or falsey value (true means it matches). (See + # #_pv_callbacks.) + # @option opts [Symbol,Array<Symbol>] :respond_to A method + # name, or list of method names, the value must respond to. (See + # #_pv_respond_to.) + # @option opts [Symbol,Array<Symbol>] :cannot_be A property, + # or a list of properties, that the value cannot have (such as `:nil` or + # `:empty`). The method with a questionmark at the end is called on the + # value (e.g. `value.empty?`). If the value does not have this method, + # it is considered valid (i.e. if you don't respond to `empty?` we + # assume you are not empty). (See #_pv_cannot_be.) + # @option opts [Proc] :coerce A proc which will be called to + # transform the user input to canonical form. The value is passed in, + # and the transformed value returned as output. Lazy values will *not* + # be passed to this method until after they are evaluated. Called in the + # context of the resource (meaning you can access other properties). + # (See #_pv_coerce.) (See #_pv_coerce.) + # @option opts [Boolean] :required `true` if this property + # must be present and not `nil`; `false` otherwise. This is checked + # after the resource is fully initialized. (See #_pv_required.) + # @option opts [Boolean] :name_property `true` if this + # property defaults to the same value as `name`. Equivalent to + # `default: lazy { name }`, except that #property_is_set? will + # return `true` if the property is set *or* if `name` is set. (See + # #_pv_name_property.) + # @option opts [Boolean] :name_attribute Same as `name_property`. + # @option opts [Object] :default The value this property + # will return if the user does not set one. If this is `lazy`, it will + # be run in the context of the instance (and able to access other + # properties). (See #_pv_default.) + # def validate(opts, map) + map = map.validation_options if map.is_a?(Property) + #-- # validate works by taking the keys in the validation map, assuming it's a hash, and # looking for _pv_:symbol as methods. Assuming it find them, it calls the right @@ -84,91 +119,8 @@ class Chef end def set_or_return(symbol, value, validation) - symbol = symbol.to_sym - iv_symbol = :"@#{symbol}" - - # Steal default, coerce, name_property and required from validation - # so that we can handle the order in which they are applied - validation = validation.dup - if validation.has_key?(:default) - default = validation.delete(:default) - elsif validation.has_key?('default') - default = validation.delete('default') - else - default = NOT_PASSED - end - coerce = validation.delete(:coerce) - coerce ||= validation.delete('coerce') - name_property = validation.delete(:name_property) - name_property ||= validation.delete('name_property') - name_property ||= validation.delete(:name_attribute) - name_property ||= validation.delete('name_attribute') - required = validation.delete(:required) - required ||= validation.delete('required') - - opts = {} - # If the user passed NOT_PASSED, or passed nil, then this is a get. - if value == NOT_PASSED || (value.nil? && !explicitly_allows_nil?(symbol, validation)) - - # Get the value if there is one - if self.instance_variable_defined?(iv_symbol) - opts[symbol] = self.instance_variable_get(iv_symbol) - - # Handle lazy values - if opts[symbol].is_a?(DelayedEvaluator) - if opts[symbol].arity >= 1 - opts[symbol] = opts[symbol].call(self) - else - opts[symbol] = opts[symbol].call - end - - # Coerce and validate the default value - _pv_required(opts, symbol, required, explicitly_allows_nil?(symbol, validation)) if required - _pv_coerce(opts, symbol, coerce) if coerce - validate(opts, { symbol => validation }) - end - - # Get the default value - else - _pv_default(opts, symbol, default) unless default == NOT_PASSED - _pv_name_property(opts, symbol, name_property) - _pv_required(opts, symbol, required, explicitly_allows_nil?(symbol, validation)) if required - - if opts.has_key?(symbol) - # Handle lazy defaults. - if opts[symbol].is_a?(DelayedEvaluator) - if opts[symbol].arity >= 1 - opts[symbol] = opts[symbol].call(self) - else - opts[symbol] = instance_eval(&opts[symbol]) - end - end - - # Coerce and validate the default value - _pv_required(opts, symbol, required, explicitly_allows_nil?(symbol, validation)) if required - _pv_coerce(opts, symbol, coerce) if coerce - # We presently do not validate defaults, for backwards compatibility. -# validate(opts, { symbol => validation }) - - # Defaults are presently "stickily" set on the instance - self.instance_variable_set(iv_symbol, opts[symbol]) - end - end - - # Set the value - else - opts[symbol] = value - unless opts[symbol].is_a?(DelayedEvaluator) - # Coerce and validate the value - _pv_required(opts, symbol, required, explicitly_allows_nil?(symbol, validation)) if required - _pv_coerce(opts, symbol, coerce) if coerce - validate(opts, { symbol => validation }) - end - - self.instance_variable_set(iv_symbol, opts[symbol]) - end - - opts[symbol] + property = SetOrReturnProperty.new(name: symbol, **validation) + property.call(self, value) end private @@ -193,8 +145,9 @@ class Chef if is_required return true if opts.has_key?(key.to_s) && (explicitly_allows_nil || !opts[key.to_s].nil?) return true if opts.has_key?(key.to_sym) && (explicitly_allows_nil || !opts[key.to_sym].nil?) - raise Exceptions::ValidationFailed, "Required argument #{key} is missing!" + raise Exceptions::ValidationFailed, "Required argument #{key.inspect} is missing!" end + true end # @@ -425,9 +378,9 @@ class Chef # x 1 #=> invalid # ``` # - # @example PropertyType + # @example Property # ```ruby - # type = PropertyType.new(is: String) + # type = Property.new(is: String) # property :x, type # x 'foo' #=> valid # x 1 #=> invalid @@ -448,8 +401,12 @@ class Chef value = _pv_opts_lookup(opts, key) to_be = [ to_be ].flatten(1) to_be.each do |tb| - if tb.is_a?(Proc) + case tb + when Proc return true if instance_exec(value, &tb) + when Property + validate(opts, { key => tb.validation_options }) + return true else return true if tb === value end @@ -484,6 +441,29 @@ class Chef opts[key.to_sym] = instance_exec(opts[key], &coercer) end end + + # Used by #set_or_return to avoid emitting a deprecation warning for + # "value nil" and to keep default stickiness working exactly the same + # @api private + class SetOrReturnProperty < Chef::Property + def get(resource) + value = super + # All values are sticky, frozen or not + if !is_set?(resource) + set_value(resource, value) + end + value + end + + def call(resource, value=NOT_PASSED) + # setting to nil does a get + if value.nil? && !explicitly_accepts_nil?(resource) + get(resource) + else + super + end + end + end end end end diff --git a/lib/chef/property.rb b/lib/chef/property.rb new file mode 100644 index 0000000000..408090d37b --- /dev/null +++ b/lib/chef/property.rb @@ -0,0 +1,539 @@ +# +# Author:: John Keiser <jkeiser@chef.io> +# Copyright:: Copyright (c) 2015 John Keiser. +# 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/exceptions' +require 'chef/delayed_evaluator' + +class Chef + # + # Type and validation information for a property on a resource. + # + # A property named "x" manipulates the "@x" instance variable on a + # resource. The *presence* of the variable (`instance_variable_defined?(@x)`) + # tells whether the variable is defined; it may have any actual value, + # constrained only by validation. + # + # Properties may have validation, defaults, and coercion, and have full + # support for lazy values. + # + # @see Chef::Resource.property + # @see Chef::DelayedEvaluator + # + class Property + # + # Create a reusable property type that can be used in multiple properties + # in different resources. + # + # @param options [Hash<Symbol,Object>] Validation options. See Chef::Resource.property for + # the list of options. + # + # @example + # Property.derive(default: 'hi') + # + def self.derive(**options) + new(**options) + end + + # + # Create a new property. + # + # @param options [Hash<Symbol,Object>] Property options, including + # control options here, as well as validation options (see + # Chef::Mixin::ParamsValidate#validate for a description of validation + # options). + # @option options [Symbol] :name The name of this property. + # @option options [Class] :declared_in The class this property comes from. + # @option options [Symbol] :instance_variable_name The instance variable + # tied to this property. Must include a leading `@`. Defaults to `@<name>`. + # `nil` means the property is opaque and not tied to a specific instance + # variable. + # @option options [Boolean] :desired_state `true` if this property is part of desired + # state. Defaults to `true`. + # @option options [Boolean] :identity `true` if this property is part of object + # identity. Defaults to `false`. + # @option options [Boolean] :name_property `true` if this + # property defaults to the same value as `name`. Equivalent to + # `default: lazy { name }`, except that #property_is_set? will + # return `true` if the property is set *or* if `name` is set. + # @option options [Object] :default The value this property + # will return if the user does not set one. If this is `lazy`, it will + # be run in the context of the instance (and able to access other + # properties) and cached. If not, the value will be frozen with Object#freeze + # to prevent users from modifying it in an instance. + # @option options [Proc] :coerce A proc which will be called to + # transform the user input to canonical form. The value is passed in, + # and the transformed value returned as output. Lazy values will *not* + # be passed to this method until after they are evaluated. Called in the + # context of the resource (meaning you can access other properties). + # @option options [Boolean] :required `true` if this property + # must be present; `false` otherwise. This is checked after the resource + # is fully initialized. + # + def initialize(**options) + options.each { |k,v| options[k.to_sym] = v if k.is_a?(String) } + options[:name_property] = options.delete(:name_attribute) unless options.has_key?(:name_property) + @options = options + + if options.has_key?(:default) + options[:default] = options[:default].freeze + end + options[:name] = options[:name].to_sym if options[:name] + options[:instance_variable_name] = options[:instance_variable_name].to_sym if options[:instance_variable_name] + end + + # + # The name of this property. + # + # @return [String] + # + def name + options[:name] + end + + # + # The class this property was defined in. + # + # @return [Class] + # + def declared_in + options[:declared_in] + end + + # + # The instance variable associated with this property. + # + # Defaults to `@<name>` + # + # @return [Symbol] + # + def instance_variable_name + if options.has_key?(:instance_variable_name) + options[:instance_variable_name] + elsif name + :"@#{name}" + end + end + + # + # The raw default value for this resource. + # + # Does not coerce or validate the default. Does not evaluate lazy values. + # + # Defaults to `lazy { name }` if name_property is true; otherwise defaults to + # `nil` + # + def default + return options[:default] if options.has_key?(:default) + return Chef::DelayedEvaluator.new { name } if name_property? + nil + end + + # + # Whether this is part of the resource's natural identity or not. + # + # @return [Boolean] + # + def identity? + options[:identity] + end + + # + # Whether this is part of desired state or not. + # + # Defaults to true. + # + # @return [Boolean] + # + def desired_state? + return true if !options.has_key?(:desired_state) + options[:desired_state] + end + + # + # Whether this is name_property or not. + # + # @return [Boolean] + # + def name_property? + options[:name_property] + end + + # + # Whether this property has a default value. + # + # @return [Boolean] + # + def has_default? + options.has_key?(:default) || name_property? + end + + # + # Whether this property is required or not. + # + # @return [Boolean] + # + def required? + options[:required] + end + + # + # Validation options. (See Chef::Mixin::ParamsValidate#validate.) + # + # @return [Hash<Symbol,Object>] + # + def validation_options + @validation_options ||= options.reject { |k,v| + [:declared_in,:name,:instance_variable_name,:desired_state,:identity,:default,:name_property,:coerce,:required].include?(k) + } + end + + # + # Handle the property being called. + # + # The base implementation does the property get-or-set: + # + # ```ruby + # resource.myprop # get + # resource.myprop value # set + # ``` + # + # Subclasses may implement this with any arguments they want, as long as + # the corresponding DSL calls it correctly. + # + # @param resource [Chef::Resource] The resource to get the property from. + # @param value The value to set (or NOT_PASSED if it is a get). + # + # @return The current value of the property. If it is a `set`, lazy values + # will be returned without running, validating or coercing. If it is a + # `get`, the non-lazy, coerced, validated value will always be returned. + # + def call(resource, value=NOT_PASSED) + if value == NOT_PASSED + return get(resource) + end + + # myprop nil is sometimes a get (backcompat) + if value.nil? && !explicitly_accepts_nil?(resource) + # If you say "my_property nil" and the property explicitly accepts + # nil values, we consider this a get. + Chef::Log.deprecation("#{name} nil currently does not overwrite the value of #{name}. This will change in Chef 13, and the value will be set to nil instead. Please change your code to explicitly accept nil using \"property :#{name}, [MyType, nil]\", or stop setting this value to nil.") + return get(resource) + end + + # Anything else (myprop value) is a set + set(resource, value) + end + + # + # Get the property value from the resource, handling lazy values, + # defaults, and validation. + # + # - If the property's value is lazy, it is evaluated, coerced and validated. + # - If the property has no value, and is required, raises ValidationFailed. + # - If the property has no value, but has a lazy default, it is evaluated, + # coerced and validated. If the evaluated value is frozen, the resulting + # - If the property has no value, but has a default, the default value + # will be returned and frozen. If the default value is lazy, it will be + # evaluated, coerced and validated, and the result stored in the property. + # - If the property has no value, but is name_property, `resource.name` + # is retrieved, coerced, validated and stored in the property. + # - Otherwise, `nil` is returned. + # + # @param resource [Chef::Resource] The resource to get the property from. + # + # @return The value of the property. + # + # @raise Chef::Exceptions::ValidationFailed If the value is invalid for + # this property, or if the value is required and not set. + # + def get(resource) + if is_set?(resource) + value = get_value(resource) + if value.is_a?(DelayedEvaluator) + value = exec_in_resource(resource, value) + value = coerce(resource, value) + validate(resource, value) + end + value + + else + if has_default? + value = default + if value.is_a?(DelayedEvaluator) + value = exec_in_resource(resource, value) + end + + value = coerce(resource, value) + + # We don't validate defaults + + # If the value is mutable (non-frozen), we set it on the instance + # so that people can mutate it. (All constant default values are + # frozen.) + if !value.frozen? + set_value(resource, value) + end + + value + + elsif required? + raise Chef::Exceptions::ValidationFailed, "#{name} is required" + end + end + end + + # + # Set the value of this property in the given resource. + # + # Non-lazy values are coerced and validated before being set. Coercion + # and validation of lazy values is delayed until they are first retrieved. + # + # @param resource [Chef::Resource] The resource to set this property in. + # @param value The value to set. + # + # @return The value that was set, after coercion (if lazy, still returns + # the lazy value) + # + # @raise Chef::Exceptions::ValidationFailed If the value is invalid for + # this property. + # + def set(resource, value) + unless value.is_a?(DelayedEvaluator) + value = coerce(resource, value) + validate(resource, value) + end + set_value(resource, value) + end + + # + # Find out whether this property has been set. + # + # This will be true if: + # - The user explicitly set the value + # - The property has a default, and the value was retrieved. + # + # From this point of view, it is worth looking at this as "what does the + # user think this value should be." In order words, if the user grabbed + # the value, even if it was a default, they probably based calculations on + # it. If they based calculations on it and the value changes, the rest of + # the world gets inconsistent. + # + # @param resource [Chef::Resource] The resource to get the property from. + # + # @return [Boolean] + # + def is_set?(resource) + value_is_set?(resource) + end + + # + # Reset the value of this property so that is_set? will return false and the + # default will be returned in the future. + # + # @param resource [Chef::Resource] The resource to get the property from. + # + def reset(resource) + reset_value(resource) + end + + # + # Coerce an input value into canonical form for the property. + # + # After coercion, the value is suitable for storage in the resource. + # You must validate values after coercion, however. + # + # Does no special handling for lazy values. + # + # @param resource [Chef::Resource] The resource we're coercing against + # (to provide context for the coerce). + # @param value The value to coerce. + # + # @return The coerced value. + # + # @raise Chef::Exceptions::ValidationFailed If the value is invalid for + # this property. + # + def coerce(resource, value) + if options.has_key?(:coerce) + value = exec_in_resource(resource, options[:coerce], value) + end + value + end + + # + # Validate a value. + # + # Calls Chef::Mixin::ParamsValidate#validate with #validation_options as + # options. + # + # @param resource [Chef::Resource] The resource we're validating against + # (to provide context for the validate). + # @param value The value to validate. + # + # @raise Chef::Exceptions::ValidationFailed If the value is invalid for + # this property. + # + def validate(resource, value) + resource.validate({ name => value }, { name => validation_options }) + end + + # + # Derive a new Property that is just like this one, except with some added or + # changed options. + # + # @param options [Hash<Symbol,Object>] List of options that would be passed + # to #initialize. + # + # @return [Property] The new property type. + # + def derive(**modified_options) + Property.new(**options.merge(**modified_options)) + end + + # + # Emit the DSL for this property into the resource class (`declared_in`). + # + # Creates a getter and setter for the property. + # + def emit_dsl + # We don't create the getter/setter if it's a custom property; we will + # be using the existing getter/setter to manipulate it instead. + return if !instance_variable_name + + # We prefer this form because the property name won't show up in the + # stack trace if you use `define_method`. + declared_in.class_eval <<-EOM, __FILE__, __LINE__+1 + def #{name}(value=NOT_PASSED) + self.class.properties[#{name.inspect}].call(self, value) + end + def #{name}=(value) + self.class.properties[#{name.inspect}].set(self, value) + end + EOM + rescue SyntaxError + # If the name is not a valid ruby name, we use define_method. + resource_class.define_method(name) do |value=NOT_PASSED| + self.class.properties[name].call(self, value) + end + resource_class.define_method("#{name}=") do |value| + self.class.properties[name].set(self, value) + end + end + + protected + + # + # The options this Property will use for get/set behavior and validation. + # + # @see #initialize for a list of valid options. + # + attr_reader :options + + # + # Find out whether this type accepts nil explicitly. + # + # A type accepts nil explicitly if "is" allows nil, it validates as nil, *and* is not simply + # an empty type. + # + # These examples accept nil explicitly: + # ```ruby + # property :a, [ String, nil ] + # property :a, [ String, NilClass ] + # property :a, [ String, proc { |v| v.nil? } ] + # ``` + # + # This does not (because the "is" doesn't exist or doesn't have nil): + # + # ```ruby + # property :x, String + # ``` + # + # These do not, even though nil would validate fine (because they do not + # have "is"): + # + # ```ruby + # property :a + # property :a, equal_to: [ 1, 2, 3, nil ] + # property :a, kind_of: [ String, NilClass ] + # property :a, respond_to: [ ] + # property :a, callbacks: { "a" => proc { |v| v.nil? } } + # ``` + # + # @param resource [Chef::Resource] The resource we're coercing against + # (to provide context for the coerce). + # + # @return [Boolean] Whether this value explicitly accepts nil. + # + # @api private + def explicitly_accepts_nil?(resource) + options.has_key?(:is) && resource.send(:_pv_is, { name => nil }, name, options[:is], raise_error: false) + end + + def get_value(resource) + if instance_variable_name + resource.instance_variable_get(instance_variable_name) + else + resource.send(name) + end + end + + def set_value(resource, value) + if instance_variable_name + resource.instance_variable_set(instance_variable_name, value) + else + resource.send(name, value) + end + end + + def value_is_set?(resource) + if instance_variable_name + resource.instance_variable_defined?(instance_variable_name) + else + true + end + end + + def reset_value(resource) + if instance_variable_name + if value_is_set?(resource) + resource.remove_instance_variable(instance_variable_name) + end + else + raise ArgumentError, "Property #{name} has no instance variable defined and cannot be reset" + end + end + + def exec_in_resource(resource, proc, *args) + if resource + if proc.arity > args.size + value = proc.call(resource, *args) + else + value = resource.instance_exec(*args, &proc) + end + else + value = proc.call + end + + if value.is_a?(DelayedEvaluator) + value = coerce(resource, value) + validate(resource, value) + end + value + end + end +end diff --git a/lib/chef/resource.rb b/lib/chef/resource.rb index 696089fe3e..5e9ba42703 100644 --- a/lib/chef/resource.rb +++ b/lib/chef/resource.rb @@ -101,7 +101,7 @@ class Chef # @param run_context The context of the Chef run. Corresponds to #run_context. # def initialize(name, run_context=nil) - name(name) + name(name) unless name.nil? @run_context = run_context @noop = nil @before = nil @@ -130,37 +130,27 @@ class Chef end # - # The name of this particular resource. + # The list of properties defined on this resource. # - # This special resource attribute is set automatically from the declaration - # of the resource, e.g. + # Everything defined with `property` is in this list. # - # execute 'Vitruvius' do - # command 'ls' - # end - # - # Will set the name to "Vitruvius". + # @param include_superclass [Boolean] `true` to include properties defined + # on superclasses; `false` or `nil` to return the list of properties + # directly on this class. # - # This is also used in to_s to show the resource name, e.g. `execute[Vitruvius]`. - # - # This is also used for resource notifications and subscribes in the same manner. - # - # This will coerce any object into a string via #to_s. Arrays are a special case - # so that `package ["foo", "bar"]` becomes package[foo, bar] instead of the more - # awkward `package[["foo", "bar"]]` that #to_s would produce. - # - # @param name [Object] The name to set, typically a String or Array - # @return [String] The name of this Resource. + # @return [Hash<Symbol,Property>] The list of property names and types. # - def name(name=nil) - if !name.nil? - if name.is_a?(Array) - @name = name.join(', ') + def self.properties(include_superclass=true) + @properties ||= {} + if include_superclass + if superclass.respond_to?(:properties) + superclass.properties.merge(@properties) else - @name = name.to_s + @properties.dup end + else + @properties end - @name end # @@ -475,13 +465,21 @@ class Chef # # Get the value of the state attributes in this resource as a hash. # + # Does not include properties that are not set (unless they are identity + # properties). + # # @return [Hash{Symbol => Object}] A Hash of attribute => value for the # Resource class's `state_attrs`. + # def state_for_resource_reporter - self.class.state_attrs.inject({}) do |state_attrs, attr_name| - state_attrs[attr_name] = send(attr_name) - state_attrs + state = {} + state_properties = self.class.state_properties + state_properties.each do |property| + if property.identity? || property.is_set?(self) + state[property.name] = send(property.name) + end end + state end # @@ -494,17 +492,22 @@ class Chef alias_method :state, :state_for_resource_reporter # - # The value of the identity attribute, if declared. Falls back to #name if - # no identity attribute is declared. + # The value of the identity of this resource. # - # @return The value of the identity attribute. + # - If there are no identity properties on the resource, `name` is returned. + # - If there is exactly one identity property on the resource, it is returned. + # - If there are more than one, they are returned in a hash. + # + # @return [Object,Hash<Symbol,Object>] The identity of this resource. # def identity - if identity_attr = self.class.identity_attr - send(identity_attr) - else - name + result = {} + identity_properties = self.class.identity_properties + identity_properties.each do |property| + result[property.name] = send(property.name) end + return result.values.first if identity_properties.size == 1 + result end # @@ -756,6 +759,10 @@ class Chef # will return if the user does not set one. If this is `lazy`, it will # be run in the context of the instance (and able to access other # properties). + # @option options [Boolean] :desired_state `true` if this property is + # part of desired state. Defaults to `true`. + # @option options [Boolean] :identity `true` if this property + # is part of object identity. Defaults to `false`. # # @example Bare property # property :x @@ -772,29 +779,100 @@ class Chef def self.property(name, type=NOT_PASSED, **options) name = name.to_sym - if type != NOT_PASSED + options.merge!(name: name, declared_in: self) + + if type == NOT_PASSED + # If a type is not passed, the property derives from the + # superclass property (if any) + if properties.has_key?(name) + property = properties[name].derive(**options) + else + property = property_type(**options) + end + + # If a Property is specified, derive a new one from that. + elsif type.is_a?(Property) || (type.is_a?(Class) && type <= Property) + property = type.derive(**options) + + # If a primitive type was passed, combine it with "is" + else if options[:is] options[:is] = ([ type ] + [ options[:is] ]).flatten(1) else options[:is] = type end + property = property_type(**options) end - define_method(name) do |value=NOT_PASSED| - set_or_return(name, value, options) - end - define_method("#{name}=") do |value| - set_or_return(name, value, options) - end + local_properties = properties(false) + local_properties[name] = property + + property.emit_dsl end # + # Create a reusable property type that can be used in multiple properties + # in different resources. + # + # @param options [Hash<Symbol,Object>] Validation options. see #property for + # the list of options. + # + # @example + # property_type(default: 'hi') + # + def self.property_type(**options) + Property.derive(**options) + end + + # + # The name of this particular resource. + # + # This special resource attribute is set automatically from the declaration + # of the resource, e.g. + # + # execute 'Vitruvius' do + # command 'ls' + # end + # + # Will set the name to "Vitruvius". + # + # This is also used in to_s to show the resource name, e.g. `execute[Vitruvius]`. + # + # This is also used for resource notifications and subscribes in the same manner. + # + # This will coerce any object into a string via #to_s. Arrays are a special case + # so that `package ["foo", "bar"]` becomes package[foo, bar] instead of the more + # awkward `package[["foo", "bar"]]` that #to_s would produce. + # + # @param name [Object] The name to set, typically a String or Array + # @return [String] The name of this Resource. + # + property :name, String, coerce: proc { |v| v.is_a?(Array) ? v.join(', ') : v.to_s }, desired_state: false + + # # Whether this property has been set (or whether it has a default that has # been retrieved). # + # @param name [Symbol] The name of the property. + # @return [Boolean] `true` if the property has been set. + # def property_is_set?(name) - name = name.to_sym - instance_variable_defined?("@#{name}") + property = self.class.properties[name.to_sym] + raise ArgumentError, "Property #{name} is not defined in class #{self}" if !property + property.is_set?(self) + end + + # + # Clear this property as if it had never been set. It will thereafter return + # the default. + # been retrieved). + # + # @param name [Symbol] The name of the property. + # + def reset_property(name) + property = self.class.properties[name.to_sym] + raise ArgumentError, "Property #{name} is not defined in class #{self}" if !property + property.reset(self) end # @@ -808,46 +886,186 @@ class Chef DelayedEvaluator.new(&block) end - # Set or return the list of "state attributes" implemented by the Resource - # subclass. State attributes are attributes that describe the desired state - # of the system, such as file permissions or ownership. In general, state - # attributes are attributes that could be populated by examining the state - # of the system (e.g., File.stat can tell you the permissions on an - # existing file). Contrarily, attributes that are not "state attributes" - # usually modify the way Chef itself behaves, for example by providing - # additional options for a package manager to use when installing a - # package. + # + # Get or set the list of desired state properties for this resource. + # + # State properties are properties that describe the desired state + # of the system, such as file permissions or ownership. + # In general, state properties are properties that could be populated by + # examining the state of the system (e.g., File.stat can tell you the + # permissions on an existing file). Contrarily, properties that are not + # "state properties" usually modify the way Chef itself behaves, for example + # by providing additional options for a package manager to use when + # installing a package. # # This list is used by the Chef client auditing system to extract # information from resources to describe changes made to the system. - def self.state_attrs(*attr_names) - @state_attrs ||= [] - @state_attrs = attr_names unless attr_names.empty? + # + # This method is unnecessary when declaring properties with `property`; + # properties are added to state_properties by default, and can be turned off + # with `desired_state: false`. + # + # ```ruby + # property :x # part of desired state + # property :y, desired_state: false # not part of desired state + # ``` + # + # @param names [Array<Symbol>] A list of property names to set as desired + # state. + # + # @return [Array<Property>] All properties in desired state. + # + def self.state_properties(*names) + if !names.empty? + names = names.map { |name| name.to_sym }.uniq - # Return *all* state_attrs that this class has, including inherited ones - if superclass.respond_to?(:state_attrs) - superclass.state_attrs + @state_attrs - else - @state_attrs + local_properties = properties(false) + # Add new properties to the list. + names.each do |name| + property = properties[name] + if !property + self.property name, instance_variable_name: false, desired_state: true + elsif !property.desired_state? + self.property name, desired_state: true + end + end + + # If state_attrs *excludes* something which is currently desired state, + # mark it as desired_state: false. + local_properties.each do |name,property| + if property.desired_state? && !names.include?(name) + self.property name, desired_state: false + end + end end + + properties.values.select { |property| property.desired_state? } end - # Set or return the "identity attribute" for this resource class. This is - # generally going to be the "name attribute" for this resource. In other - # words, the resource type plus this attribute uniquely identify a given - # bit of state that chef manages. For a File resource, this would be the - # path, for a package resource, it will be the package name. This will show - # up in chef-client's audit records as a searchable field. - def self.identity_attr(attr_name=nil) - @identity_attr ||= nil - @identity_attr = attr_name if attr_name + # + # Set or return the list of "state properties" implemented by the Resource + # subclass. + # + # Equivalent to calling #state_properties and getting `state_properties.keys`. + # + # @deprecated Use state_properties.keys instead. Note that when you declare + # properties with `property`: properties are added to state_properties by + # default, and can be turned off with `desired_state: false` + # + # ```ruby + # property :x # part of desired state + # property :y, desired_state: false # not part of desired state + # ``` + # + # @param names [Array<Symbol>] A list of property names to set as desired + # state. + # + # @return [Array<Symbol>] All property names with desired state. + # + def self.state_attrs(*names) + state_properties(*names).map { |property| property.name } + end - # If this class doesn't have an identity attr, we'll defer to the superclass: - if @identity_attr || !superclass.respond_to?(:identity_attr) - @identity_attr - else - superclass.identity_attr + # + # Set the identity of this resource to a particular set of properties. + # + # This drives #identity, which returns data that uniquely refers to a given + # resource on the given node (in such a way that it can be correlated + # across Chef runs). + # + # This method is unnecessary when declaring properties with `property`; + # properties can be added to identity during declaration with + # `identity: true`. + # + # ```ruby + # property :x, identity: true # part of identity + # property :y # not part of identity + # ``` + # + # If no properties are marked as identity, "name" is considered the identity. + # + # @param names [Array<Symbol>] A list of property names to set as the identity. + # + # @return [Array<Property>] All identity properties. + # + def self.identity_properties(*names) + if !names.empty? + names = names.map { |name| name.to_sym } + + # Add or change properties that are not part of the identity. + names.each do |name| + property = properties[name] + if !property + self.property name, instance_variable_name: false, identity: true + elsif !property.identity? + self.property name, identity: true + end + end + + # If state_attrs *excludes* something which is currently part of the + # identity, mark it as identity: false. + properties.each do |name,property| + if property.identity? && !names.include?(name) + self.property name, identity: false + end + end + end + + result = properties.values.select { |property| property.identity? } + result = [ properties[:name] ] if result.empty? + result + end + + # + # Set the identity of this resource to a particular property. + # + # This drives #identity, which returns data that uniquely refers to a given + # resource on the given node (in such a way that it can be correlated + # across Chef runs). + # + # This method is unnecessary when declaring properties with `property`; + # properties can be added to identity during declaration with + # `identity: true`. + # + # ```ruby + # property :x, identity: true # part of identity + # property :y # not part of identity + # ``` + # + # @param name [Symbol] A list of property names to set as the identity. + # + # @return [Symbol] The identity property if there is only one; or `nil` if + # there are more than one. + # + # @raise [ArgumentError] If no arguments are passed and the resource has + # more than one identity property. + # + def self.identity_property(name=nil) + result = identity_properties(*Array(name)) + if result.size > 1 + raise Chef::Exceptions::MultipleIdentityError, "identity_property cannot be called on an object with more than one identity property (#{result.map { |r| r.name }.join(", ")})." end + result.first + end + + # + # Set a property as the "identity attribute" for this resource. + # + # Identical to calling #identity_property.first.key. + # + # @param name [Symbol] The name of the property to set. + # + # @return [Symbol] + # + # @deprecated `identity_property` should be used instead. + # + # @raise [ArgumentError] If no arguments are passed and the resource has + # more than one identity property. + # + def self.identity_attr(name=nil) + property = identity_property(name) + return nil if !property + property.name end # @@ -1199,9 +1417,6 @@ class Chef define_method(:load_current_resource) {} end end - def self.default_action=(action_name) - default_action(action_name) - end # # Internal Resource Interface (for Chef) |