Reusable Cookbook Patterns

Nov 13, 20131 like1,787 views

The document discusses cookbook reusability and proposes using Chef classes as a way to improve upon wrapper cookbooks and LWRPs. It introduces the Poise gem, which provides DSL extensions and utilities to make defining Chef classes easier and more full-featured, allowing for things like actions, attributes, notifications, lazy defaults, option collectors, and nested sub-resources.

Cookbook Reusability
Noah Kantrowitz
Balanced, Inc

The problem
Community cookbooks only
do 90% of what you need.

New Problem

•
Complex contribution process.
•
Forking during iteration.
•
Proliferation of special cases.

Wrapper Cookbooks

•
Overriding attributes.
•
chef-rewind, here be dragons.
•

Extension by prepend/append.

Requirements

• Responsive effort:
5% change

~5% work

• Documented extension mechanism.
Integration with kitchen, berks, etc.
•

LWRPs?

•
Still only prepend/append.
•
No substitution except rewind.
•
Better, but not by much.

Enter: Classes
class Chef
class Resource::Something < Resource
...
end
class Provider::Something < Provider
...
end
end

Chef::Resource
def initialize(*args)
super
@resource_name = :something
@action = :enable
@allowed_actions = [
:enable, :disable
]
end

$Chef::Resource def path(arg=nil) set_or_return(:path, arg, { kind_of: String }) end$

Chef::Provider
def load_current_resource
end
def whyrun_supported?
true
end
def action_enable
...
end

Why?

•
• No really, subclassing!
Allows detailed, responsive
•
Subclassing.

customization.

Verbosity

• A lot of boilerplate code.
Missing some LWRP DSL goodies.
•

Poise
class Resource::Something < Resource
include Poise
...
end
class Provider::Something < Provider
include Poise
...
end

LWRP-ese
class Resource::Something < Resource
include Poise
actions(:enable, :disable)
attribute(:path, kind_of: String)
end

Notifying Block
def action_enable
notifying_block do
...
end
end

Include Recipe
def action_enable
include_recipe 'something'
end

Lazy Defaults
class Resource::Something < Resource
include Poise
attribute(:path,
default: lazy { node['path'] }
)
end

Option Collector
class Resource::Something < Resource
include Poise
attribute(:database,
option_collector: True)
end

Option Collector
something 'one' do
database host: 'a', port: 8000
end

Option Collector
something 'one' do
database do
host 'a'
port 8000
end
end

Sub-resources
class Resource::Something < Resource
include Poise(container: true)
end

Sub-resources
class Resource::Foo < Resource
include Poise(parent: Something)
end

Sub-resources
something 'one' do
...
foo 'asdf' do
...
end
end

Sub-resources
something 'one' do
...
end
foo 'asdf' do
parent 'one'
end

Sub-resources
something 'one'
foo 'asdf'

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