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;;; Guix Data Service -- Information about Guix over time
;;; Copyright © 2019, 2020, 2021 Christopher Baines <mail@cbaines.net>
;;;
;;; This program is free software: you can redistribute it and/or
;;; modify it under the terms of the GNU Affero General Public License
;;; as published by the Free Software Foundation, either version 3 of
;;; the License, or (at your option) any later version.
;;;
;;; This program 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
;;; Affero General Public License for more details.
;;;
;;; You should have received a copy of the GNU Affero General Public
;;; License along with this program. If not, see
;;; <http://www.gnu.org/licenses/>.
(define-module (guix-data-service model system)
#:use-module (srfi srfi-1)
#:use-module (ice-9 vlist)
#:use-module (ice-9 match)
#:use-module (squee)
#:use-module (guix-data-service model utils)
#:export (system->system-id
lookup-system-id
list-systems))
(define system->system-id-cache
(make-hash-table))
(define systems-cache #f)
(define (system->system-id conn system)
(let ((cached-value (hash-ref system->system-id-cache
system)))
(or cached-value
(match (insert-missing-data-and-return-all-ids
conn
"systems"
'(system)
`((,system)))
((id)
(hash-set! system->system-id-cache
system
id)
(set! systems-cache #f)
id)))))
(define (lookup-system-id conn system)
(let ((cached-value (hash-ref system->system-id-cache
system)))
(or cached-value
(match (exec-query
conn
"SELECT id FROM systems WHERE system = $1"
(list system))
(((id-string))
(let ((id (string->number id-string)))
(hash-set! system->system-id-cache
system
id)
id))
(() #f)))))
(define (list-systems conn)
(if systems-cache
systems-cache
(let ((systems
(map car
(exec-query
conn
"SELECT system FROM systems ORDER BY system"))))
(set! systems-cache systems)
systems)))
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