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#
# Author:: Tyler Ball (<tball@chef.io>)
# Copyright:: Copyright (c) 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_relative "../resource"
require_relative "resource_collection_serialization"
class Chef
class ResourceCollection
class ResourceSet
include ResourceCollection::ResourceCollectionSerialization
# Matches a multiple resource lookup specification,
# e.g., "service[nginx,unicorn]"
MULTIPLE_RESOURCE_MATCH = /^(.+)\[(.+?),(.+)\]$/.freeze
# Matches a single resource lookup specification,
# e.g., "service[nginx]"
SINGLE_RESOURCE_MATCH = /^(.+)\[(.*)\]$/.freeze
# Matches e.g. "apt_update" with no name
NAMELESS_RESOURCE_MATCH = /^([^\[\]\s]+)$/.freeze
def initialize
@resources_by_key = {}
end
def keys
@resources_by_key.keys
end
def insert_as(resource, resource_type = nil, instance_name = nil)
is_chef_resource!(resource)
resource_type ||= resource.resource_name
instance_name ||= resource.name
key = create_key(resource_type, instance_name)
@resources_by_key[key] = resource
end
def lookup(key)
raise ArgumentError, "Must pass a Chef::Resource or String to lookup" unless key.is_a?(String) || key.is_a?(Chef::Resource)
key = key.to_s
res = @resources_by_key[key]
unless res
raise Chef::Exceptions::ResourceNotFound, "Cannot find a resource matching #{key} (did you define it first?)"
end
res
end
def delete(key)
raise ArgumentError, "Must pass a Chef::Resource or String to delete" unless key.is_a?(String) || key.is_a?(Chef::Resource)
key = key.to_s
res = @resources_by_key.delete(key)
if res == @resources_by_key.default
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 = []
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
# @deprecated
# resources is a poorly named, but we have to maintain it for back
# compat.
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 validate_lookup_spec!(query_object)
case query_object
when Chef::Resource, SINGLE_RESOURCE_MATCH, MULTIPLE_RESOURCE_MATCH, NAMELESS_RESOURCE_MATCH, 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
def self.from_hash(o)
collection = new
rl = o["instance_vars"]["@resources_by_key"]
resources = rl.merge(rl) { |k, r| Chef::Resource.from_hash(r) }
collection.instance_variable_set(:@resources_by_key, resources)
collection
end
private
def create_key(resource_type, instance_name)
"#{resource_type}[#{instance_name}]"
end
def find_resource_by_hash(arg)
results = []
arg.each do |resource_type, name_list|
instance_names = name_list.is_a?(Array) ? name_list : [ name_list ]
instance_names.each do |instance_name|
results << lookup(create_key(resource_type, instance_name))
end
end
results
end
def find_resource_by_string(arg)
begin
if arg =~ SINGLE_RESOURCE_MATCH
resource_type = $1
name = $2
return [ lookup(create_key(resource_type, name)) ]
end
rescue Chef::Exceptions::ResourceNotFound => e
if arg =~ MULTIPLE_RESOURCE_MATCH
begin
results = []
resource_type = $1
arg =~ /^.+\[(.+)\]$/
resource_list = $1
resource_list.split(",").each do |instance_name|
results << lookup(create_key(resource_type, instance_name))
end
Chef.deprecated(:multiresource_match, "The resource_collection multi-resource syntax is deprecated")
return results
rescue Chef::Exceptions::ResourceNotFound
raise e
end
else
raise e
end
end
if arg =~ NAMELESS_RESOURCE_MATCH
resource_type = $1
name = ""
return [ lookup(create_key(resource_type, name)) ]
end
raise ArgumentError, "Bad string format #{arg}, you must have a string like resource_type[name]!"
end
end
end
end
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