Asymmetrik/node-rest-starter

import os from 'os';
import path from 'path';

import config, { IConfig } from 'config';
import winston, { LoggerOptions } from 'winston';
import DailyRotateFile from 'winston-daily-rotate-file';

const { combine, errors, json, splat, timestamp } = winston.format;

function createLogger(loggerName: string) {
    const loggerConfig = config.get<IConfig>('logger').get<IConfig>(loggerName);

    const options = {
        format: combine(timestamp(), errors({ stack: true }), splat(), json()),
        silent: loggerConfig.get('silent'),
        defaultMeta: {
            hostname: os.hostname(),
            name: config.get('app.instanceName'),
            pid: process.pid
        },
        transports: []
    };

    const consoleConfig = loggerConfig.get<IConfig>('console');
    if (consoleConfig.get('enabled')) {
        options.transports.push(
            new winston.transports.Console({
                level: consoleConfig.get('level')
            })
        );
    }

    const fileConfig = loggerConfig.get<IConfig>('file');
    if (fileConfig.get('enabled')) {
        options.transports.push(
            new DailyRotateFile({
                level: fileConfig.get('level'),
                filename: `${fileConfig.get('directory') || '.'}${
                    path.sep
                }${fileConfig.get('filename')}`,
                datePattern: fileConfig.get('datePattern'),
                zippedArchive: fileConfig.get('zippedArchive'),
                maxSize: fileConfig.get('maxSize'),
                maxFiles: fileConfig.get('maxFiles')
            })
        );
    }

    return winston.createLogger(options as LoggerOptions);
}

export const logger = createLogger('application');

export const auditLogger = createLogger('audit');

export const metricsLogger = createLogger('metrics');