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Diffstat (limited to 'aws/cloudformation/base.scm')
| -rw-r--r-- | aws/cloudformation/base.scm | 220 |
1 files changed, 220 insertions, 0 deletions
diff --git a/aws/cloudformation/base.scm b/aws/cloudformation/base.scm new file mode 100644 index 0000000..76c073d --- /dev/null +++ b/aws/cloudformation/base.scm @@ -0,0 +1,220 @@ +;;; 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)))))) |