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;;; guile-cloudformation --- Scheme DSL for CloudFormation templates
;;; Copyright © 2018 David Thompson <davet@gnu.org>
;;;
;;; Guile-CloudFormation is free software: you can redistribute it
;;; and/or modify it under the terms of the GNU General Public License
;;; as published by the Free Software Foundation, either version 3 of
;;; the License, or (at your option) any later version.
;;;
;;; Guile-CloudFormation is distributed in the hope that it will be
;;; useful, but WITHOUT ANY WARRANTY; without even the implied
;;; warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
;;; See the GNU General Public License for more details.
;;;
;;; You should have received a copy of the GNU General Public License
;;; along with this program. If not, see
;;; <http://www.gnu.org/licenses/>.
(define-module (aws cloudformation base)
#:use-module (aws cloudformation utils)
#:use-module (ice-9 match)
#:use-module (oop goops)
#:use-module (srfi srfi-1)
#:export (<cloudformation-property>
<cloudformation-object>
<cloudformation-attribute>
<cloudformation-resource>
<cloudformation-stack>
attributes
description
documentation-url
id
name
outputs
parameters
primitive-type
properties
required?
resource-name
resources
to-json
type-check
type-checker
update-type
valid?))
(define-class <cloudformation-property> ()
(name #:getter name #:init-keyword #:name)
(type-checker #:getter type-checker #:init-keyword #:type-checker)
(required? #:getter required? #:init-keyword #:required?)
(update-type #:getter update-type #:init-keyword #:update-type)
(documentation-url #:getter documentation-url
#:init-keyword #:documentation-url))
(define-method (type-check (procedure <procedure>) x)
(procedure x))
(define-method (type-check (property <cloudformation-property>) x)
((type-checker property) x))
(define-class <cloudformation-class> (<class>)
(properties #:getter properties)
(cfn-name #:getter cfn-name)
(documentation-url #:getter documentation-url))
(define-method (initialize (cfn-class <cloudformation-class>) args)
(define* (slot-cfn-property slot-name #:key cfn-property #:allow-other-keys)
(and cfn-property (cons slot-name cfn-property)))
(define* (init #:key cfn-name documentation-url slots #:allow-other-keys)
(slot-set! cfn-class 'cfn-name cfn-name)
(slot-set! cfn-class 'documentation-url documentation-url)
(slot-set! cfn-class
'properties
(filter-map (lambda (slot-args)
(apply slot-cfn-property slot-args))
slots)))
(apply init args)
(next-method))
(define-class <cloudformation-object> ()
#:metaclass <cloudformation-class>)
(define-method (initialize (obj <cloudformation-object>) args)
(next-method)
;; Ensure that all required properties have been specified, and that
;; all specified properties pass the type checker.
(for-each (match-lambda
((slot-name . prop)
(cond
((and (required? prop) (not (slot-bound? obj slot-name)))
(error "required property not specified:" slot-name))
((slot-bound? obj slot-name)
(let ((value (slot-ref obj slot-name)))
(unless (type-check prop value)
(error "wrong type for property:" slot-name value)))))))
(slot-ref (class-of obj) 'properties)))
(define-method (cfn-name (obj <cloudformation-object>))
(cfn-name (class-of obj)))
(define-method (properties (obj <cloudformation-object>))
(slot-ref (class-of obj) 'properties))
(define-method (to-json/refs obj)
(to-json obj))
(define-method (to-json (s <string>)) s)
(define-method (to-json (b <boolean>)) b)
(define-method (to-json (n <number>)) n)
(define-method (to-json (p <pair>))
(if (pair? (car p))
`(@ ,@(map (match-lambda
((k . v)
(cons k (to-json/refs v))))
p))
(cons (to-json/refs (car p)) (to-json (cdr p)))))
(define-method (to-json (null <null>))
'())
(define-method (to-json (obj <cloudformation-object>))
(cons '@
(filter-map (match-lambda
((slot-name . property)
(and (slot-bound? obj slot-name)
(cons (name property)
(to-json/refs (slot-ref obj slot-name))))))
(properties obj))))
(define-method (valid? (obj <cloudformation-object>))
(every (match-lambda
((slot-name . property)
(cond
((and (required? property) (not (slot-bound? obj slot-name)))
#f)
((not (or (required? property) (slot-bound? obj slot-name)))
#t)
(else
(type-check property (slot-ref obj slot-name))))))
(slot-ref (class-of obj) 'properties)))
(define-class <cloudformation-attribute> ()
(name #:getter name #:init-keyword #:name)
(primitive-type #:getter primitive-type #:init-keyword #:primitive-type))
(define-class <cloudformation-resource-class> (<cloudformation-class>)
(resource-name-prefix #:getter resource-name-prefix)
(attributes #:getter attributes))
(define-method (initialize (resource-class <cloudformation-resource-class>) args)
(define* (init #:key attributes cfn-name #:allow-other-keys)
(when cfn-name
(slot-set! resource-class 'resource-name-prefix
(string-concatenate
(drop (delete "" (string-split cfn-name #\:)) 1))))
(slot-set! resource-class 'attributes attributes))
(apply init args)
(next-method))
(define-class <cloudformation-resource> (<cloudformation-object>)
(id #:getter id #:init-keyword #:id)
(cfn-id #:getter cfn-id)
#:metaclass <cloudformation-resource-class>)
(define-method (initialize (resource <cloudformation-resource>) args)
(next-method)
(unless (slot-bound? resource 'id)
(error "no id specified for resource:" resource))
(slot-set! resource 'cfn-id (id->cfn-id (id resource))))
(define-method (type-check (proc <procedure>)
(resource <cloudformation-resource>))
(type-check proc "arn:dummy"))
(define-method (to-json/refs (resource <cloudformation-resource>))
`(@ ("Ref" . ,(cfn-id resource))))
(define-method (to-json (resource <cloudformation-resource>))
`(@ ("Type" . ,(cfn-name resource))
("Properties" . ,(next-method))))
(define-class <cloudformation-stack> ()
(description #:getter description #:init-keyword #:description #:init-form "")
(parameters #:getter parameters #:init-keyword #:parameters)
(resources #:getter resources #:init-keyword #:resources)
(outputs #:getter outputs #:init-keyword #:outputs))
(define-method (transitive-resources (stack <cloudformation-stack>))
(define (scan-object obj)
(cond
((is-a? obj <pair>)
(match obj
((first rest ...)
(concatenate (cons (scan-object first)
(scan-object rest))))
((key . value)
(scan-object value))))
((is-a? obj <cloudformation-resource>)
(list obj))
((is-a? obj <cloudformation-object>)
(scan-properties obj))
(else
'())))
(define (scan-properties obj)
(append-map (match-lambda
((slot-name . prop)
(let ((value (and (slot-bound? obj slot-name)
(slot-ref obj slot-name))))
(scan-object value))))
(properties obj)))
(append-map (lambda (resource)
(cons resource (scan-properties resource)))
(resources stack)))
(define-method (to-json (stack <cloudformation-stack>))
`(@ ("AWSTemplateFormatVersion" . "2010-09-09")
("Description" . ,(description stack))
("Resources" .
(@ ,@(map (lambda (resource)
(cons (cfn-id resource)
(to-json resource)))
(transitive-resources stack))))))
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