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93 lines
2.2 KiB
93 lines
2.2 KiB
/*
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* Wiki - A wiki with editor
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* Copyright (c) 2021-2021 Peter Stuifzand
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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package main
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import (
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"encoding/json"
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"fmt"
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"os"
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"path/filepath"
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)
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type BlockRepository interface {
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Save(id string, block Block) error
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Load(id string) (Block, error)
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}
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type blockSaveMessage struct {
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id string
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block Block
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}
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type blockRepo struct {
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dirname string
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saveC chan blockSaveMessage
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errC chan error
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}
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func saveBlock(dirname, id string, block Block) error {
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f, err := os.OpenFile(filepath.Join(dirname, BlocksDirectory, id), os.O_CREATE|os.O_WRONLY|os.O_TRUNC, 0644)
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if err != nil {
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return err
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}
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defer f.Close()
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enc := json.NewEncoder(f)
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enc.SetIndent("", " ")
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err = enc.Encode(&block)
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if err != nil {
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return err
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}
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return nil
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}
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func NewBlockRepo(dirname string) BlockRepository {
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saveC := make(chan blockSaveMessage, 1)
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errC := make(chan error)
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go func() {
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for msg := range saveC {
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err := saveBlock(dirname, msg.id, msg.block)
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errC <- err
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}
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}()
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return &blockRepo{
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dirname: dirname,
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saveC: saveC,
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errC: errC,
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}
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}
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func (br *blockRepo) Save(id string, block Block) error {
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br.saveC <- blockSaveMessage{id, block}
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err := <-br.errC
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return err
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}
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func (br *blockRepo) Load(id string) (Block, error) {
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f, err := os.Open(filepath.Join(br.dirname, BlocksDirectory, id))
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if err != nil {
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return Block{}, fmt.Errorf("%q: %w", id, BlockNotFound)
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}
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defer f.Close()
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var block Block
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err = json.NewDecoder(f).Decode(&block)
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if err != nil {
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return Block{}, fmt.Errorf("%q: %w", id, err)
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}
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return block, nil
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}
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