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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 { debounce } from 'lodash-es';
import { reaction } from 'mobx';
import type ConfigRepository from '../infrastructure/config/ConfigRepository.js';
import type SharedStore from '../stores/SharedStore.js';
import type Config from '../stores/config/Config.js';
import type Disposer from '../utils/Disposer.js';
import getLogger from '../utils/getLogger.js';
const DEFAULT_CONFIG_DEBOUNCE_TIME_MS = 1000;
const log = getLogger('synchronizeConfig');
export function serializeConfig(config: Config): string {
return `${JSON.stringify(config, undefined, 2)}\n`;
}
export default async function synchronizeConfig(
sharedStore: SharedStore,
repository: ConfigRepository,
debounceTime: number = DEFAULT_CONFIG_DEBOUNCE_TIME_MS,
): Promise<Disposer> {
let lastConfigOnDisk: string | undefined;
async function writeConfig(serializedConfig: string): Promise<void> {
await repository.writeConfig(serializedConfig);
lastConfigOnDisk = serializedConfig;
}
async function readConfig(): Promise<boolean> {
const result = await repository.readConfig();
if (result.found) {
const { contents } = result;
if (contents === lastConfigOnDisk) {
// No need to re-apply config if we have already applied it.
return true;
}
try {
// This cast is unsound if the config file is invalid,
// but we'll throw an error in the end anyways.
const data = JSON.parse(contents) as Config;
sharedStore.loadConfig(data);
log.info('Loaded config');
} catch (error) {
log.error('Failed to apply config snapshot', contents, error);
return true;
}
lastConfigOnDisk = serializeConfig(sharedStore.config);
if (contents !== lastConfigOnDisk) {
await writeConfig(lastConfigOnDisk);
}
}
return result.found;
}
if (!(await readConfig())) {
log.info('Config file was not found');
const serializedConfig = serializeConfig(sharedStore.config);
await writeConfig(serializedConfig);
log.info('Created config file');
}
const debouncedSerializeConfig = debounce(() => {
const serializedConfig = serializeConfig(sharedStore.config);
if (serializedConfig !== lastConfigOnDisk) {
writeConfig(serializedConfig).catch((error) => {
log.error('Failed to write config on config change', error);
});
}
}, debounceTime);
const disposeReaction = reaction(
() => sharedStore.config,
debouncedSerializeConfig,
);
const disposeWatcher = repository.watchConfig(async () => {
try {
await readConfig();
} catch (error) {
log.error('Failed to read config', error);
}
});
return () => {
disposeWatcher();
disposeReaction();
debouncedSerializeConfig.flush();
};
}
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