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92 lines
2.2 KiB
92 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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