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#
# Author:: Adam Jacob (<adam@opscode.com>)
# Author:: Christopher Walters (<cw@opscode.com>)
# Copyright:: Copyright (c) 2008, 2009 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'
require 'chef/resource_collection/stepable_iterator'
class Chef
class ResourceCollection
include Enumerable
attr_reader :iterator
def initialize
@resources = Array.new
@resources_by_name = Hash.new
@insert_after_idx = nil
end
def all_resources
@resources
end
def [](index)
@resources[index]
end
def []=(index, arg)
is_chef_resource(arg)
@resources[index] = arg
@resources_by_name[arg.to_s] = index
end
def <<(*args)
args.flatten.each do |a|
is_chef_resource(a)
@resources << a
@resources_by_name[a.to_s] = @resources.length - 1
end
end
def insert(resource)
is_chef_resource(resource)
if @insert_after_idx
# in the middle of executing a run, so any resources inserted now should
# be placed after the most recent addition done by the currently executing
# resource
@resources.insert(@insert_after_idx + 1, resource)
# update name -> location mappings and register new resource
@resources_by_name.each_key do |key|
@resources_by_name[key] += 1 if @resources_by_name[key] > @insert_after_idx
end
@resources_by_name[resource.to_s] = @insert_after_idx + 1
@insert_after_idx += 1
else
@resources << resource
@resources_by_name[resource.to_s] = @resources.length - 1
end
end
def push(*args)
args.flatten.each do |arg|
is_chef_resource(arg)
@resources.push(arg)
@resources_by_name[arg.to_s] = @resources.length - 1
end
end
def each
@resources.each do |resource|
yield resource
end
end
def execute_each_resource(&resource_exec_block)
@iterator = StepableIterator.for_collection(@resources)
@iterator.each_with_index do |resource, idx|
@insert_after_idx = idx
yield resource
end
end
def each_index
@resources.each_index do |i|
yield i
end
end
def lookup(resource)
lookup_by = nil
if resource.kind_of?(Chef::Resource)
lookup_by = resource.to_s
elsif resource.kind_of?(String)
lookup_by = resource
else
raise ArgumentError, "Must pass a Chef::Resource or String to lookup"
end
res = @resources_by_name[lookup_by]
unless res
raise Chef::Exceptions::ResourceNotFound, "Cannot find a resource matching #{lookup_by} (did you define it first?)"
end
@resources[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.
alias_method :resources, :find
# Serialize this object as a hash
def to_json(*a)
instance_vars = Hash.new
self.instance_variables.each do |iv|
instance_vars[iv] = self.instance_variable_get(iv)
end
results = {
'json_class' => self.class.name,
'instance_vars' => instance_vars
}
results.to_json(*a)
end
def self.json_create(o)
collection = self.new()
o["instance_vars"].each do |k,v|
collection.instance_variable_set(k.to_sym, v)
end
collection
end
private
def find_resource_by_hash(arg)
results = Array.new
arg.each do |resource_name, name_list|
names = name_list.kind_of?(Array) ? name_list : [ name_list ]
names.each do |name|
res_name = "#{resource_name.to_s}[#{name}]"
results << lookup(res_name)
end
end
return results
end
def find_resource_by_string(arg)
results = Array.new
case arg
when /^(.+)\[(.+?),(.+)\]$/
resource_type = $1
arg =~ /^.+\[(.+)\]$/
resource_list = $1
resource_list.split(",").each do |name|
resource_name = "#{resource_type}[#{name}]"
results << lookup(resource_name)
end
when /^(.+)\[(.+)\]$/
resource_type = $1
name = $2
resource_name = "#{resource_type}[#{name}]"
results << lookup(resource_name)
else
raise ArgumentError, "You must have a string like resource_type[name]!"
end
return results
end
def is_chef_resource(arg)
unless arg.kind_of?(Chef::Resource)
raise ArgumentError, "Members must be Chef::Resource's"
end
true
end
end
end
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