44 lines
1.8 KiB
TypeScript
44 lines
1.8 KiB
TypeScript
import fs from 'fs'
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import path from 'path'
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import { threadId } from 'worker_threads'
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import { DATA_DIR } from '../config.js'
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export type Organized = Record<string, Record<string, any>>
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export const ORGANIZED_PATH = path.join(DATA_DIR, 'organized.json')
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// Un fichier existant mais illisible lève une erreur : ne jamais repartir de {} avant d'écrire
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export function readOrganized(file = ORGANIZED_PATH): Organized {
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if (!fs.existsSync(file)) return {}
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const raw = fs.readFileSync(file, 'utf-8')
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let data: unknown
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try { data = JSON.parse(raw) }
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catch (err) { throw new Error(`organized.json illisible (${raw.length} octets) : ${err instanceof Error ? err.message : err}`) }
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if (!data || typeof data !== 'object' || Array.isArray(data)) throw new Error('organized.json : contenu inattendu')
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return data as Organized
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}
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export function writeOrganized(data: Organized, file = ORGANIZED_PATH): void {
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for (const hash of Object.keys(data))
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if (!data[hash] || Object.keys(data[hash]).length === 0) delete data[hash]
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const tmp = `${file}.${process.pid}-${threadId}.tmp`
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fs.writeFileSync(tmp, JSON.stringify(data, null, 2), 'utf-8')
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renameWithRetry(tmp, file)
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}
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// Lecture-modification-écriture synchrone ; fn renvoie false pour ne rien écrire
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export function updateOrganized(fn: (data: Organized) => boolean | void, file = ORGANIZED_PATH): void {
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const data = readOrganized(file)
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if (fn(data) !== false) writeOrganized(data, file)
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}
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function renameWithRetry(from: string, to: string, attempts = 5): void {
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for (let i = 1; ; i++) {
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try { fs.renameSync(from, to); return }
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catch (err: any) {
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if (i >= attempts || !['EPERM', 'EACCES', 'EBUSY'].includes(err?.code)) throw err
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Atomics.wait(new Int32Array(new SharedArrayBuffer(4)), 0, 0, 20 * i)
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}
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}
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}
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