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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';
import {
applySnapshot,
getSnapshot,
IDisposer,
onSnapshot,
} from 'mobx-state-tree';
import type { ConfigPersistenceService } from '../services/ConfigPersistenceService';
import type { Config, ConfigSnapshotOut } from '../stores/Config';
export class ConfigController {
static inject = ['configPersistenceService', 'configDebounceTime'] as const;
private config: Config | null = null;
private onSnapshotDisposer: IDisposer | null = null;
private lastSnapshotOnDisk: ConfigSnapshotOut | null = null;
private writingConfig: boolean = false;
constructor(
private readonly persistenceService: ConfigPersistenceService,
private readonly debounceTime: number,
) {
}
async initConfig(config: Config): Promise<void> {
this.config = config;
const foundConfig: boolean = await this.readConfig();
if (!foundConfig) {
console.log('Creating new config file');
try {
await this.writeConfig();
} catch (err) {
console.error('Failed to initialize config');
}
}
this.onSnapshotDisposer = onSnapshot(this.config, debounce((snapshot) => {
// We can compare snapshots by reference, since it is only recreated on store changes.
if (this.lastSnapshotOnDisk !== snapshot) {
this.writeConfig().catch((err) => {
console.log('Failed to write config on config change', err);
})
}
}, this.debounceTime));
this.persistenceService.watchConfig(async () => {
if (!this.writingConfig) {
await this.readConfig();
}
}, this.debounceTime);
}
private async readConfig(): Promise<boolean> {
const result = await this.persistenceService.readConfig();
if (result.found) {
try {
applySnapshot(this.config!, result.data);
this.lastSnapshotOnDisk = getSnapshot(this.config!);
console.log('Loaded config');
} catch (err) {
console.error('Failed to read config', result.data, err);
}
}
return result.found;
}
private async writeConfig(): Promise<void> {
const snapshot = getSnapshot(this.config!);
this.writingConfig = true;
try {
await this.persistenceService.writeConfig(snapshot);
this.lastSnapshotOnDisk = snapshot;
console.log('Wrote config');
} finally {
this.writingConfig = false;
}
}
dispose(): void {
this.onSnapshotDisposer?.();
}
}
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