new structure

email-worker-nodejs/src/logger.ts

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+/**
+ * Structured logging for email worker with daily rotation AND retention
+ *
+ * Uses pino for high-performance JSON logging.
+ * Includes logic to delete logs older than X days.
+ */
+
+import pino from 'pino';
+import { 
+  existsSync, 
+  mkdirSync, 
+  createWriteStream, 
+  type WriteStream, 
+  readdirSync, 
+  statSync, 
+  unlinkSync 
+} from 'node:fs';
+import { join } from 'node:path';
+
+// ---------------------------------------------------------------------------
+// Configuration
+// ---------------------------------------------------------------------------
+const LOG_DIR = '/var/log/email-worker';
+const LOG_FILE_PREFIX = 'worker';
+const RETENTION_DAYS = 14; // Logs älter als 14 Tage löschen
+
+// ---------------------------------------------------------------------------
+// File stream & Retention Logic
+// ---------------------------------------------------------------------------
+let fileStream: WriteStream | null = null;
+let currentDateStr = '';
+
+function getDateStr(): string {
+  return new Date().toISOString().slice(0, 10); // YYYY-MM-DD
+}
+
+/**
+ * Löscht alte Log-Dateien basierend auf RETENTION_DAYS
+ */
+function cleanUpOldLogs(): void {
+  try {
+    if (!existsSync(LOG_DIR)) return;
+
+    const files = readdirSync(LOG_DIR);
+    const now = Date.now();
+    const maxAgeMs = RETENTION_DAYS * 24 * 60 * 60 * 1000;
+
+    for (const file of files) {
+      // Prüfen ob es eine unserer Log-Dateien ist
+      if (!file.startsWith(LOG_FILE_PREFIX) || !file.endsWith('.log')) continue;
+
+      const filePath = join(LOG_DIR, file);
+      try {
+        const stats = statSync(filePath);
+        const ageMs = now - stats.mtimeMs;
+
+        if (ageMs > maxAgeMs) {
+          unlinkSync(filePath);
+          // Einmalig auf stdout loggen, damit man sieht, dass aufgeräumt wurde
+          process.stdout.write(`[INFO] Deleted old log file: ${file}\n`);
+        }
+      } catch (err) {
+        // Ignorieren, falls Datei gerade gelöscht wurde oder Zugriff verweigert
+      }
+    }
+  } catch (err) {
+    process.stderr.write(`[WARN] Failed to clean up old logs: ${err}\n`);
+  }
+}
+
+function ensureFileStream(): WriteStream | null {
+  const today = getDateStr();
+  
+  // Wenn wir bereits einen Stream für heute haben, zurückgeben
+  if (fileStream && currentDateStr === today) return fileStream;
+
+  try {
+    if (!existsSync(LOG_DIR)) mkdirSync(LOG_DIR, { recursive: true });
+
+    // Wenn sich das Datum geändert hat (oder beim ersten Start): Aufräumen
+    if (currentDateStr !== today) {
+        cleanUpOldLogs();
+    }
+
+    // Alten Stream schließen, falls vorhanden
+    if (fileStream) {
+        fileStream.end();
+    }
+
+    const filePath = join(LOG_DIR, `${LOG_FILE_PREFIX}.${today}.log`);
+    fileStream = createWriteStream(filePath, { flags: 'a' });
+    currentDateStr = today;
+    
+    return fileStream;
+  } catch {
+    // Silently continue without file logging (e.g. permission issue)
+    return null;
+  }
+}
+
+// ---------------------------------------------------------------------------
+// Pino logger
+// ---------------------------------------------------------------------------
+const logger = pino({
+  level: 'info',
+  formatters: {
+    level(label) {
+      return { level: label };
+    },
+  },
+  timestamp: pino.stdTimeFunctions.isoTime,
+});
+
+// ---------------------------------------------------------------------------
+// Log level mapping
+// ---------------------------------------------------------------------------
+type LogLevel = 'DEBUG' | 'INFO' | 'WARNING' | 'ERROR' | 'CRITICAL' | 'SUCCESS';
+
+const LEVEL_MAP: Record<LogLevel, keyof pino.Logger> = {
+  DEBUG: 'debug',
+  INFO: 'info',
+  WARNING: 'warn',
+  ERROR: 'error',
+  CRITICAL: 'fatal',
+  SUCCESS: 'info',
+};
+
+// ---------------------------------------------------------------------------
+// Public API
+// ---------------------------------------------------------------------------
+export function log(
+  message: string,
+  level: LogLevel = 'INFO',
+  workerName = 'unified-worker',
+): void {
+  const prefix = level === 'SUCCESS' ? '[SUCCESS] ' : '';
+  const formatted = `[${workerName}] ${prefix}${message}`;
+
+  // Pino (stdout/json)
+  const method = LEVEL_MAP[level] ?? 'info';
+  (logger as any)[method](formatted);
+
+  // File (plain text)
+  const stream = ensureFileStream();
+  if (stream) {
+    const ts = new Date().toISOString().replace('T', ' ').slice(0, 19);
+    const line = `[${ts}] [${level}] [${workerName}] ${prefix}${message}\n`;
+    stream.write(line);
+  }
+}