feat: implémenter réellement la sauvegarde hebdomadaire de la base

src/utils/__tests__/backup-database.test.js

@@ -0,0 +1,62 @@
+import {describe, it, expect, afterEach} from 'vitest'
+import fs from 'fs'
+import os from 'os'
+import path from 'path'
+import {backupDatabase} from '../backup-database.js'
+
+const tmpDirs = []
+
+function makeTmpDir() {
+  const dir = fs.mkdtempSync(path.join(os.tmpdir(), 'backup-database-test-'))
+  tmpDirs.push(dir)
+  return dir
+}
+
+describe('backupDatabase', () => {
+  afterEach(() => {
+    for (const dir of tmpDirs.splice(0)) {
+      fs.rmSync(dir, {recursive: true, force: true})
+    }
+  })
+
+  it("ne fait rien quand le fichier de base n'existe pas", () => {
+    const root = makeTmpDir()
+    const result = backupDatabase({
+      dbPath: path.join(root, 'inexistant.db'),
+      backupsDir: path.join(root, 'backups')
+    })
+
+    expect(result).toBeNull()
+    expect(fs.existsSync(path.join(root, 'backups'))).toBe(false)
+  })
+
+  it('copie le fichier de base dans le dossier de sauvegardes', () => {
+    const root = makeTmpDir()
+    const dbPath = path.join(root, 'data.db')
+    fs.writeFileSync(dbPath, 'contenu-de-la-base')
+    const backupsDir = path.join(root, 'backups')
+
+    const result = backupDatabase({dbPath, backupsDir})
+
+    expect(result).not.toBeNull()
+    expect(fs.existsSync(result)).toBe(true)
+    expect(fs.readFileSync(result, 'utf8')).toBe('contenu-de-la-base')
+  })
+
+  it('ne conserve que les 8 sauvegardes les plus récentes', () => {
+    const root = makeTmpDir()
+    const dbPath = path.join(root, 'data.db')
+    fs.writeFileSync(dbPath, 'contenu')
+    const backupsDir = path.join(root, 'backups')
+    fs.mkdirSync(backupsDir, {recursive: true})
+
+    for (let i = 0; i < 10; i++) {
+      fs.writeFileSync(path.join(backupsDir, `data-2020-01-0${i}.db`), 'ancien')
+    }
+
+    backupDatabase({dbPath, backupsDir})
+
+    const remaining = fs.readdirSync(backupsDir).filter(name => name.startsWith('data-'))
+    expect(remaining).toHaveLength(8)
+  })
+})

src/utils/backup-database.js

@@ -0,0 +1,31 @@
+'use strict';
+
+const fs = require('fs');
+const path = require('path');
+
+const RETENTION = 8;
+
+function backupDatabase({dbPath, backupsDir}) {
+  if (!fs.existsSync(dbPath)) {
+    return null;
+  }
+
+  fs.mkdirSync(backupsDir, {recursive: true});
+
+  const timestamp = new Date().toISOString().replace(/[:.]/g, '-');
+  const backupPath = path.join(backupsDir, `data-${timestamp}.db`);
+  fs.copyFileSync(dbPath, backupPath);
+
+  const backups = fs.readdirSync(backupsDir)
+    .filter(name => name.startsWith('data-') && name.endsWith('.db'))
+    .sort();
+
+  const toDelete = backups.slice(0, Math.max(backups.length - RETENTION, 0));
+  for (const name of toDelete) {
+    fs.unlinkSync(path.join(backupsDir, name));
+  }
+
+  return backupPath;
+}
+
+module.exports = {backupDatabase};