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;;; guile-aws --- Scheme DSL for the AWS APIs
;;; Copyright © 2019 Ricardo Wurmus <rekado@elephly.net>
;;;
;;; Guile-AWS 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-AWS 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/>.
;;; Commentary:
;;;
;;; This module defines the basic record types, their constructors and
;;; accessors, as well as the type checker procedure generator.
;;;
;;; There are three records: 1) <aws-shape> for types that are little
;;; more than type-checked wrappers around primitive types (e.g. a
;;; ranged integer, a typed list, or a string with an enumeration of
;;; possible values; 2) <aws-structure> for composite types, which can
;;; have an arbitrary number of members of different types; and 3)
;;; <aws-operation>, which is how either of the previous types can be
;;; turned into API requests.
;;;
;;; Code:
(define-module (aws base)
#:use-module (ice-9 match)
#:use-module (srfi srfi-1)
#:use-module (srfi srfi-9)
#:use-module (srfi srfi-9 gnu)
#:use-module ((srfi srfi-19) #:select (date?))
#:use-module (srfi srfi-26)
#:use-module ((rnrs bytevectors) #:select (bytevector?))
#:export (aws-shape
aws-shape?
aws-shape-aws-name
aws-shape-value
aws-shape-location-name
aws-shape-primitive?
aws-structure
aws-structure-aws-name
aws-structure-members
aws-structure?
aws-member
aws-member-name
aws-member-value
aws-member-documentation
aws-member-location
aws-member-location-name
aws-name
ensure
aws-operation))
;;; Simple shapes
(define-record-type <aws-shape>
(make-aws-shape aws-name primitive? type-checker location location-name value)
aws-shape?
(aws-name aws-shape-aws-name)
(primitive? aws-shape-primitive?)
(type-checker aws-shape-type-checker)
(location aws-shape-location)
(location-name aws-shape-location-name)
(value aws-shape-value))
(define* (aws-shape #:key aws-name primitive? type-checker location location-name documentation)
(let ((proc (lambda (value)
(if (type-checker value)
(make-aws-shape aws-name primitive? type-checker location location-name value)
(error (format #f "~a: invalid value: ~a~%"
aws-name value))))))
(set-procedure-property! proc 'name aws-name)
(set-procedure-property! proc 'documentation documentation)
proc))
(set-record-type-printer! <aws-shape>
(lambda (obj port)
(format port "#<aws:~a ~a>"
(aws-shape-aws-name obj)
(aws-shape-value obj))))
;;; Structures
(define-record-type <aws-structure>
(aws-structure aws-name members)
aws-structure?
(aws-name aws-structure-aws-name)
(members aws-structure-members))
(set-record-type-printer! <aws-structure>
(lambda (obj port)
(format port "#<aws-structure:~a>"
(aws-structure-aws-name obj))))
(define-record-type <aws-member>
(make-aws-member name value shape documentation location location-name)
aws-member?
(name aws-member-name)
(value aws-member-value)
(shape aws-member-shape)
(documentation aws-member-documentation)
(location aws-member-location)
(location-name aws-member-location-name))
(define* (aws-member #:key name value shape documentation location location-name)
(make-aws-member name value shape documentation location location-name))
(set-record-type-printer! <aws-structure>
(lambda (obj port)
(format port "#<aws-structure:~a>"
(aws-structure-aws-name obj))))
(define (aws-name thing)
(cond
((aws-structure? thing)
(aws-structure-aws-name thing))
((aws-shape? thing)
(aws-shape-aws-name thing))
(else #f)))
(define (ensure value type)
(unless (and=> (aws-name value) (cut eq? <> type))
(error (format #f "wrong type: ~a, expected ~a~%."
value type))))
(define* (aws-operation requester #:key name input-type output-type http documentation)
(let ((proc
(lambda* (#:optional input)
(unless (eq? (aws-name input) input-type)
(error (format #f "~a: input must be of type ~a: ~a~%"
name input-type input)))
;; TODO: do something with the response!
(requester #:http http #:operation-name name #:input input))))
(set-procedure-property! proc 'documentation documentation)
(set-procedure-property! proc 'name name)
proc))
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