1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
|
/*
* 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 ms from 'ms';
import { ConfigPersistenceService } from '../services/ConfigPersistenceService';
import { Config, ConfigSnapshotOut } from '../stores/Config';
const DEFAULT_DEBOUNCE_TIME = ms('1s');
class ConfigController {
readonly #config: Config;
readonly #persistenceService: ConfigPersistenceService;
readonly #onSnapshotDisposer: IDisposer;
readonly #watcherDisposer: IDisposer;
#lastSnapshotOnDisk: ConfigSnapshotOut | null = null;
#writingConfig: boolean = false;
#configMTime: Date | null = null;
constructor(
config: Config,
persistenceService: ConfigPersistenceService,
debounceTime: number,
) {
this.#config = config;
this.#persistenceService = persistenceService;
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);
})
}
}, debounceTime));
this.#watcherDisposer = this.#persistenceService.watchConfig(async (mtime) => {
if (!this.#writingConfig && (this.#configMTime === null || mtime > this.#configMTime)) {
await this.#readConfig();
}
}, debounceTime);
}
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;
}
async #writeConfig(): Promise<void> {
const snapshot = getSnapshot(this.#config);
this.#writingConfig = true;
try {
this.#configMTime = await this.#persistenceService.writeConfig(snapshot);
this.#lastSnapshotOnDisk = snapshot;
console.log('Wrote config');
} finally {
this.#writingConfig = false;
}
}
async initConfig(): Promise<void> {
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');
}
}
}
dispose(): void {
this.#onSnapshotDisposer();
this.#watcherDisposer();
}
}
export async function initConfig(
config: Config,
persistenceService: ConfigPersistenceService,
debounceTime: number = DEFAULT_DEBOUNCE_TIME,
): Promise<IDisposer> {
const controller = new ConfigController(config, persistenceService, debounceTime);
await controller.initConfig();
return () => controller.dispose();
}
|
