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#
# Author:: Tyler Ball (<tball@getchef.com>)
# Copyright:: Copyright (c) 2014 Chef Software, 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 ResourceSet
# Matches a multiple resource lookup specification,
# e.g., "service[nginx,unicorn]"
MULTIPLE_RESOURCE_MATCH = /^(.+)\[(.+?),(.+)\]$/
# Matches a single resource lookup specification,
# e.g., "service[nginx]"
SINGLE_RESOURCE_MATCH = /^(.+)\[(.+)\]$/
def initialize
@resources_by_key = Hash.new
end
def insert_as(resource_type, instance_name, resource)
assert_chef_resource(resource)
@resources_by_key[create_key(resource_type, instance_name)] = resource
end
# TODO when do we need to lookup a resource by resource? That smells like we should still have the resource say how its indexed, or we shouldn't be doing that.
def lookup(resource_type, instance_name)
raise ArgumentError, "Must pass a String to lookup" unless key.kind_of?(String)
res = @resources_by_key[create_key(resource_type, instance_name)]
unless res
raise Chef::Exceptions::ResourceNotFound, "Cannot find a resource matching #{key} (did you define it first?)"
end
res
end
# Find existing resources by searching the list of existing resources. Possible
# forms are:
#
# find(:file => "foobar")
# find(:file => [ "foobar", "baz" ])
# find("file[foobar]", "file[baz]")
# find("file[foobar,baz]")
#
# Returns the matching resource, or an Array of matching resources.
#
# Raises an ArgumentError if you feed it bad lookup information
# Raises a Runtime Error if it can't find the resources you are looking for.
def find(*args)
results = Array.new
args.each do |arg|
case arg
when Hash
results << find_resource_by_hash(arg)
when String
results << find_resource_by_string(arg)
else
msg = "arguments to #{self.class.name}#find should be of the form :resource => 'name' or 'resource[name]'"
raise Chef::Exceptions::InvalidResourceSpecification, msg
end
end
flat_results = results.flatten
flat_results.length == 1 ? flat_results[0] : flat_results
end
# resources is a poorly named, but we have to maintain it for back
# compat.
# TODO do we anymore?
alias_method :resources, :find
# Returns true if +query_object+ is a valid string for looking up a
# resource, or raises InvalidResourceSpecification if not.
# === Arguments
# * query_object should be a string of the form
# "resource_type[resource_name]", a single element Hash (e.g., :service =>
# "apache2"), or a Chef::Resource (this is the happy path). Other arguments
# will raise an exception.
# === Returns
# * true returns true for all valid input.
# === Raises
# * Chef::Exceptions::InvalidResourceSpecification for all invalid input.
def self.validate_lookup_spec!(query_object)
case query_object
when Chef::Resource
true
when SINGLE_RESOURCE_MATCH, MULTIPLE_RESOURCE_MATCH
true
when Hash
true
when String
raise Chef::Exceptions::InvalidResourceSpecification,
"The string `#{query_object}' is not valid for resource collection lookup. Correct syntax is `resource_type[resource_name]'"
else
raise Chef::Exceptions::InvalidResourceSpecification,
"The object `#{query_object.inspect}' is not valid for resource collection lookup. " +
"Use a String like `resource_type[resource_name]' or a Chef::Resource object"
end
end
# TODO the json serialization/unserialization could be put into a module
def self.create_key(resource_type, instance_name)
"#{resource_type}[#{instance_name}]"
end
private
def find_resource_by_hash(arg)
results = Array.new
arg.each do |resource_type, name_list|
instance_names = name_list.kind_of?(Array) ? name_list : [ name_list ]
instance_names.each do |instance_name|
results << lookup(resource_type, instance_name)
end
end
return results
end
def find_resource_by_string(arg)
results = Array.new
case arg
when MULTIPLE_RESOURCE_MATCH
resource_type = $1
arg =~ /^.+\[(.+)\]$/
resource_list = $1
resource_list.split(",").each do |instance_name|
results << lookup(resource_type, instance_name)
end
when SINGLE_RESOURCE_MATCH
resource_type = $1
name = $2
results << lookup(resource_type, name)
else
raise ArgumentError, "Bad string format #{arg}, you must have a string like resource_type[name]!"
end
return results
end
# TODO put into common module
def assert_chef_resource(arg)
unless arg.kind_of?(Chef::Resource)
raise ArgumentError, "Cannot insert a #{arg.class} into a resource collection: must be a subclass of Chef::Resource"
end
true
end
end
end
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