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| | ;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2022 pukkamustard <pukkamustard@posteo.net>
;;;
;;; This file is part of GNU Guix.
;;;
;;; GNU Guix 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.
;;;
;;; GNU Guix 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 GNU Guix. If not, see <http://www.gnu.org/licenses/>.
(define-module (guix eris fs-store)
#:use-module (rnrs io ports)
#:use-module (guix build utils) ; for mkdir-p
#:use-module (eris utils base32)
#:export (eris-fs-store-reducer
eris-fs-store-ref))
;;; Commentary:
;;;
;;; This module provides a file-system based store of ERIS encoded blocks.
;;;
;;; Code:
(define (eris-fs-store-reducer store-directory)
(case-lambda
(() (mkdir-p store-directory))
((result) result)
((_ ref-block)
(let* ((ref (car ref-block))
(b32 (base32-encode ref))
(pre (substring b32 0 2))
(suf (substring b32 2))
(pre-dir (string-append store-directory "/" pre))
(path (string-append pre-dir "/" suf))
(block (cdr ref-block)))
(mkdir-p pre-dir)
(unless (file-exists? path)
(call-with-output-file path
(lambda (port) (put-bytevector port block))
#:binary #t))
#t))))
(define* (eris-fs-store-ref ref #:key store-directory)
(let* ((b32 (base32-encode ref))
(pre (substring b32 0 2))
(suf (substring b32 2))
(path (string-append store-directory "/" pre "/" suf)))
(if (file-exists? path)
(call-with-input-file path
(lambda (port) (get-bytevector-all port))
#:binary #t)
#f)))
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