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re-write data file if malformed json

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This commit is contained in:
Kyle Spearrin 2018-10-09 15:18:25 -04:00
parent a867c14b2a
commit 2870b7472b
1 changed files with 23 additions and 15 deletions
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36
src/services/lowdbStorage.service.ts
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@ -11,6 +11,7 @@ import { Utils } from '../misc/utils';
export class LowdbStorageService implements StorageService { export class LowdbStorageService implements StorageService {
private db: lowdb.LowdbSync<any>; private db: lowdb.LowdbSync<any>;
private defaults: any; private defaults: any;
private dataFilePath: string;
constructor(defaults?: any, dir?: string, private allowCache = false) { constructor(defaults?: any, dir?: string, private allowCache = false) {
this.defaults = defaults; this.defaults = defaults;
@ -20,25 +21,30 @@ export class LowdbStorageService implements StorageService {
if (!fs.existsSync(dir)) { if (!fs.existsSync(dir)) {
NodeUtils.mkdirpSync(dir, '700'); NodeUtils.mkdirpSync(dir, '700');
} }
const p = path.join(dir, 'data.json'); this.dataFilePath = path.join(dir, 'data.json');
adapter = new FileSync(p); adapter = new FileSync(this.dataFilePath);
} }
try {
this.db = lowdb(adapter); this.db = lowdb(adapter);
} catch (e) {
if (e instanceof SyntaxError) {
fs.writeFileSync(this.dataFilePath, '');
this.db = lowdb(adapter);
} else {
throw e;
}
}
} }
init() { init() {
if (this.defaults != null) { if (this.defaults != null) {
if (!this.allowCache) { this.readForNoCache();
this.db.read();
}
this.db.defaults(this.defaults).write(); this.db.defaults(this.defaults).write();
} }
} }
get<T>(key: string): Promise<T> { get<T>(key: string): Promise<T> {
if (!this.allowCache) { this.readForNoCache();
this.db.read();
}
const val = this.db.get(key).value(); const val = this.db.get(key).value();
if (val == null) { if (val == null) {
return Promise.resolve(null); return Promise.resolve(null);
@ -47,18 +53,20 @@ export class LowdbStorageService implements StorageService {
} }
save(key: string, obj: any): Promise<any> { save(key: string, obj: any): Promise<any> {
if (!this.allowCache) { this.readForNoCache();
this.db.read();
}
this.db.set(key, obj).write(); this.db.set(key, obj).write();
return Promise.resolve(); return Promise.resolve();
} }
remove(key: string): Promise<any> { remove(key: string): Promise<any> {
if (!this.allowCache) { this.readForNoCache();
this.db.read();
}
this.db.unset(key).write(); this.db.unset(key).write();
return Promise.resolve(); return Promise.resolve();
} }
private readForNoCache() {
if (!this.allowCache) {
this.db.read();
}
}
} }