inital commit

Overlord-Server/src/logger.ts

@@ -0,0 +1,73 @@
+import winston from "winston";
+import { ensureDataDir } from "./paths";
+
+const NODE_ENV = process.env.NODE_ENV || "development";
+const rawLogLevel = (process.env.LOG_LEVEL || "").trim().toLowerCase();
+const validLevels = new Set(["error", "warn", "info", "http", "verbose", "debug", "silly"]);
+const LOG_LEVEL = validLevels.has(rawLogLevel)
+  ? rawLogLevel
+  : NODE_ENV === "production"
+    ? "info"
+    : "debug";
+
+const devFormat = winston.format.combine(
+  winston.format.colorize(),
+  winston.format.timestamp({ format: "HH:mm:ss.SSS" }),
+  winston.format.printf((info: any) => {
+    const { level, message, timestamp, ...meta } = info;
+    let msg = `${timestamp} ${level}: ${message}`;
+    if (Object.keys(meta).length > 0) {
+      msg += ` ${JSON.stringify(meta)}`;
+    }
+    return msg;
+  }),
+);
+
+const prodFormat = winston.format.combine(
+  winston.format.timestamp(),
+  winston.format.errors({ stack: true }),
+  winston.format.json(),
+);
+
+export const logger = winston.createLogger({
+  level: LOG_LEVEL,
+  format: NODE_ENV === "production" ? prodFormat : devFormat,
+  transports: [
+    new winston.transports.Console({
+      level: LOG_LEVEL,
+      stderrLevels: ["error"],
+    }),
+  ],
+
+  exitOnError: false,
+});
+
+if (NODE_ENV === "production") {
+  const dataDir = ensureDataDir();
+
+  logger.add(
+    new winston.transports.File({
+      filename: `${dataDir}/error.log`,
+      level: "error",
+      maxsize: 10485760,
+      maxFiles: 5,
+    }),
+  );
+
+  logger.add(
+    new winston.transports.File({
+      filename: `${dataDir}/combined.log`,
+      maxsize: 10485760,
+      maxFiles: 5,
+    }),
+  );
+}
+
+if (rawLogLevel && !validLevels.has(rawLogLevel)) {
+  // eslint-disable-next-line no-console
+  console.warn(`Invalid LOG_LEVEL='${rawLogLevel}', defaulting to ${LOG_LEVEL}`);
+}
+
+logger.info(`Logger initialized (level: ${LOG_LEVEL}, env: ${NODE_ENV})`);
+
+export default logger;