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/*
* Copyright (C) 2021-2022 Kristóf Marussy <kristof@marussy.com>
*
* This file is part of Sophie.
*
* Sophie 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, version 3.
*
* 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 <https://www.gnu.org/licenses/>.
*
* SPDX-License-Identifier: AGPL-3.0-only
*/
import { watch } from 'fs';
import { readFile, stat, writeFile } from 'fs/promises';
import JSON5 from 'json5';
import throttle from 'lodash-es/throttle';
import { join } from 'path';
import type { ConfigSnapshotOut } from '../stores/Config';
import { Disposer } from '../utils';
export type ReadConfigResult = { found: true; data: unknown; } | { found: false; };
export class ConfigPersistenceService {
private readonly configFilePath: string;
private timeLastWritten: Date | null = null;
constructor(
private readonly userDataDir: string,
private readonly configFileName: string = 'config.json5',
) {
this.configFileName = configFileName;
this.configFilePath = join(this.userDataDir, this.configFileName);
}
async readConfig(): Promise<ReadConfigResult> {
let configStr;
try {
configStr = await readFile(this.configFilePath, 'utf8');
} catch (err) {
if ((err as NodeJS.ErrnoException).code === 'ENOENT') {
return { found: false };
}
throw err;
}
return {
found: true,
data: JSON5.parse(configStr),
};
}
async writeConfig(configSnapshot: ConfigSnapshotOut): Promise<void> {
const configJson = JSON5.stringify(configSnapshot, {
space: 2,
});
await writeFile(this.configFilePath, configJson, 'utf8');
const stats = await stat(this.configFilePath);
this.timeLastWritten = stats.mtime;
}
watchConfig(callback: () => Promise<void>, throttleMs: number): Disposer {
const configChanged = throttle(async () => {
let mtime: Date;
try {
const stats = await stat(this.configFilePath);
mtime = stats.mtime;
} catch (err) {
if ((err as NodeJS.ErrnoException).code === 'ENOENT') {
return;
}
throw err;
}
if (this.timeLastWritten === null || mtime > this.timeLastWritten) {
return callback();
}
}, throttleMs);
const watcher = watch(this.userDataDir, {
persistent: false,
});
watcher.on('change', (eventType, filename) => {
if (eventType === 'change'
&& (filename === this.configFileName || filename === null)) {
configChanged()?.catch((err) => {
console.log('Unhandled error while listening for config changes', err);
});
}
});
return () => watcher.close();
}
}
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