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;; This file is part of eris-cl.
;; Copyright (C) 2022 Piotr Szarmański
;; eris-cl is free software: you can redistribute it and/or modify it under the
;; terms of the GNU Lesser General Public License as published by the Free
;; Software Foundation, either version 3 of the License, or (at your option) any
;; later version.
;; eris-cl 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
;; eris-cl. If not, see <https://www.gnu.org/licenses/>.
(in-package :eris)
(defclass hash-backend (encoding-backend decoding-backend)
((table :type hash-table)))
(defmethod shared-initialize :after ((hash-backend hash-backend) slot-names
&rest initargs
&key &allow-other-keys)
(declare (ignore initargs slot-names))
(let ((hash-table (make-hash-table :test #'equalp)))
(with-slots (table output-function fetch-function) hash-backend
(setf table hash-table
fetch-function (lambda (reference)
(declare (type octet-vector reference))
(copy-seq (gethash reference hash-table)))
output-function (lambda (block reference)
(declare (type octet-vector block reference))
(setf (gethash reference hash-table)
(copy-seq block))
block)))))
(defmethod fetch-data (read-capability (backend hash-backend) &key &allow-other-keys)
(declare (type read-capability read-capability))
(with-slots (fetch-function) backend
(eris-decode read-capability fetch-function :cache-capacity nil)))
(defmethod store-data (input (backend hash-backend) &key (secret null-secret) (block-size 1kib) &allow-other-keys)
(declare (type octet-vector secret))
(with-slots (output-function) backend
(eris-encode input
block-size
output-function
:hash-output nil
:secret secret)))
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