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#
# Author:: Daniel DeLeo (<dan@opscode.com>)
# Copyright:: Copyright (c) 2010 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
module Mixin
def self.deprecated_constants
@deprecated_constants ||= {}
end
# Add a deprecated constant to the Chef::Mixin namespace.
# === Arguments
# * name: the constant name, as a relative symbol.
# * replacement: the constant to return instead.
# * message: A message telling the user what to do instead.
# === Example:
# deprecate_constant(:RecipeDefinitionDSLCore, Chef::DSL::Recipe, <<-EOM)
# Chef::Mixin::RecipeDefinitionDSLCore is deprecated, use Chef::DSL::Recipe instead.
# EOM
def self.deprecate_constant(name, replacement, message)
deprecated_constants[name] = {:replacement => replacement, :message => message}
end
# Const missing hook to look up deprecated constants defined with
# deprecate_constant. Emits a warning to the logger and returns the
# replacement constant. Will call super, most likely causing an exception
# for the missing constant, if +name+ is not found in the
# deprecated_constants collection.
def self.const_missing(name)
if new_const = deprecated_constants[name]
Chef::Log.warn(new_const[:message])
Chef::Log.warn("Called from: \n#{caller[0...3].map {|l| "\t#{l}"}.join("\n")}")
new_const[:replacement]
else
super
end
end
module Deprecation
class DeprecatedObjectProxyBase
KEEPERS = %w{__id__ __send__ instance_eval == equal? initialize object_id}
instance_methods.each { |method_name| undef_method(method_name) unless KEEPERS.include?(method_name.to_s)}
end
class DeprecatedInstanceVariable < DeprecatedObjectProxyBase
def initialize(target, ivar_name, level=nil)
@target, @ivar_name = target, ivar_name
@level ||= :warn
end
def method_missing(method_name, *args, &block)
log_deprecation_msg(caller[0..3])
@target.send(method_name, *args, &block)
end
def inspect
@target.inspect
end
private
def log_deprecation_msg(*called_from)
called_from = called_from.flatten
log("Accessing #{@ivar_name} by the variable @#{@ivar_name} is deprecated. Support will be removed in a future release.")
log("Please update your cookbooks to use #{@ivar_name} in place of @#{@ivar_name}. Accessed from:")
called_from.each {|l| log(l)}
end
def log(msg)
# WTF: I don't get the log prefix (i.e., "[timestamp] LEVEL:") if I
# send to Chef::Log. No one but me should use method_missing, ever.
Chef::Log.logger.send(@level, msg)
end
end
def deprecated_ivar(obj, name, level=nil)
DeprecatedInstanceVariable.new(obj, name, level)
end
def deprecated_attr(name, alternative)
deprecated_attr_reader(name, alternative)
deprecated_attr_writer(name, alternative)
end
def deprecated_attr_reader(name, alternative, level=:warn)
define_method(name) do
Chef::Log.deprecation("#{self.class}.#{name} is deprecated. Support will be removed in a future release.")
Chef::Log.deprecation(alternative)
Chef::Log.deprecation("Called from:")
caller[0..3].each {|c| Chef::Log.deprecation(c)}
instance_variable_get("@#{name}")
end
end
def deprecated_attr_writer(name, alternative, level=:warn)
define_method("#{name}=") do |value|
Chef::Log.deprecation("Writing to #{self.class}.#{name} with #{name}= is deprecated. Support will be removed in a future release.")
Chef::Log.deprecation(alternative)
Chef::Log.deprecation("Called from:")
caller[0..3].each {|c| Chef::Log.deprecation(c)}
instance_variable_set("@#{name}", value)
end
end
end
end
end
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