@fran-834/gs-microservice-core/dist/helpers/logger/logger.js

Core package for Node.js microservices by Galduria Software. Includes security, logging, validation, and error handling middlewares.

import * as winston from "winston";
import DailyRotateFile from "winston-daily-rotate-file";
import dotenvconf from "dotenv";
dotenvconf.config();
const { combine, timestamp, json } = winston.format;
/**
 * Transport for rotating combined logs.
 */
const fileCombinedRotateTransport = new DailyRotateFile({
    filename: "./logs/combined-%DATE%.log",
    datePattern: "YYYY-MM-DD",
    maxFiles: "14d",
    level: "info",
});
/**
 * Transport for rotating error logs.
 */
const fileErrorRotateTransport = new DailyRotateFile({
    filename: "./logs/error-%DATE%.log",
    datePattern: "YYYY-MM-DD",
    level: "error",
    maxFiles: "14d",
});
/**
 * Winston logger instance with daily rotate file transports for combined and error logs.
 * Handles exceptions and rejections as well.
 * @type {import('winston').Logger}
 */
const logger = winston.loggers.add("appLogger", {
    level: process.env.LOG_LEVEL ?? "info",
    format: combine(timestamp(), json()),
    defaultMeta: { service: process.env.SERVICE_NAME ?? "unknown-service" },
    transports: [
        new winston.transports.Console(), //{ format: winston.format.simple() }),
        //
        // - Write all logs with importance level of `error` or less to `error.log`
        // - Write all logs with importance level of `info` or less to `combined.log`
        //
        fileErrorRotateTransport,
        fileCombinedRotateTransport,
    ],
    exceptionHandlers: [
        new winston.transports.Console({ format: winston.format.combine() }),
        new DailyRotateFile({ filename: "./logs/exceptions-%DATE%.log", datePattern: "YYYY-MM-DD", maxFiles: "14d" }),
    ],
    rejectionHandlers: [
        new winston.transports.Console({ format: winston.format.combine() }),
        new DailyRotateFile({ filename: "./logs/rejections-%DATE%.log", datePattern: "YYYY-MM-DD", maxFiles: "14d" }),
    ],
});
export default logger;