server-ts: Port backup service

src/services/backup.ts

@@ -0,0 +1,82 @@
+"use strict";
+
+import dateUtils = require('./date_utils');
+import optionService = require('./options');
+import fs = require('fs-extra');
+import dataDir = require('./data_dir');
+import log = require('./log');
+import syncMutexService = require('./sync_mutex');
+import cls = require('./cls');
+import sql = require('./sql');
+import path = require('path');
+
+type BackupType = ("daily" | "weekly" | "monthly");
+
+function getExistingBackups() {
+    if (!fs.existsSync(dataDir.BACKUP_DIR)) {
+        return [];
+    }
+
+    return fs.readdirSync(dataDir.BACKUP_DIR)
+        .filter(fileName => fileName.includes("backup"))
+        .map(fileName => {
+            const filePath = path.resolve(dataDir.BACKUP_DIR, fileName);
+            const stat = fs.statSync(filePath)
+
+            return {fileName, filePath, mtime: stat.mtime};
+        });
+}
+
+function regularBackup() {
+    cls.init(() => {
+        periodBackup('lastDailyBackupDate', 'daily', 24 * 3600);
+
+        periodBackup('lastWeeklyBackupDate', 'weekly', 7 * 24 * 3600);
+
+        periodBackup('lastMonthlyBackupDate', 'monthly', 30 * 24 * 3600);
+    });
+}
+
+function isBackupEnabled(backupType: BackupType) {
+    const optionName = `${backupType}BackupEnabled`;
+
+    return optionService.getOptionBool(optionName);
+}
+
+function periodBackup(optionName: string, backupType: BackupType, periodInSeconds: number) {
+    if (!isBackupEnabled(backupType)) {
+        return;
+    }
+
+    const now = new Date();
+    const lastBackupDate = dateUtils.parseDateTime(optionService.getOption(optionName));
+
+    if (now.getTime() - lastBackupDate.getTime() > periodInSeconds * 1000) {
+        backupNow(backupType);
+
+        optionService.setOption(optionName, dateUtils.utcNowDateTime());
+    }
+}
+
+async function backupNow(name: string) {
+    // we don't want to back up DB in the middle of sync with potentially inconsistent DB state
+    return await syncMutexService.doExclusively(async () => {
+        const backupFile = `${dataDir.BACKUP_DIR}/backup-${name}.db`;
+
+        await sql.copyDatabase(backupFile);
+
+        log.info(`Created backup at ${backupFile}`);
+
+        return backupFile;
+    });
+}
+
+if (!fs.existsSync(dataDir.BACKUP_DIR)) {
+    fs.mkdirSync(dataDir.BACKUP_DIR, 0o700);
+}
+
+export = {
+    getExistingBackups,
+    backupNow,
+    regularBackup
+};