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logger.js
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logger.js
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const { createLogger, format, transports } = require('winston');
require('winston-daily-rotate-file');
require('dotenv').config();
const path = require('path');
// Define log directory
const logDirectory = path.join(__dirname, 'logs');
// Create a transport for daily log rotation
const dailyRotateFileTransport = new transports.DailyRotateFile({
filename: `${logDirectory}/%DATE%-app.log`,
datePattern: 'YYYY-MM-DD',
maxSize: '20m',
maxFiles: '14d',
level: 'info'
});
// Create a transport for error logs with daily rotation
const dailyRotateErrorFileTransport = new transports.DailyRotateFile({
filename: `${logDirectory}/%DATE%-error.log`,
datePattern: 'YYYY-MM-DD',
maxSize: '20m',
maxFiles: '30d',
level: 'error'
});
// Define custom formats
const customFormat = format.combine(
format.colorize(),
format.timestamp({ format: 'YYYY-MM-DD HH:mm:ss' }),
format.printf(({ timestamp, level, message, service, ...meta }) => {
return `${timestamp} [${service || 'app'}] ${level}: ${message} ${Object.keys(meta).length ? JSON.stringify(meta, null, 2) : ''}`;
})
);
// Create logger
const logger = createLogger({
level: process.env.LOG_LEVEL || 'info',
format: format.combine(
format.timestamp(),
format.errors({ stack: true }),
format.json()
),
defaultMeta: { service: 'user-service' },
transports: [
dailyRotateFileTransport,
dailyRotateErrorFileTransport,
new transports.File({ filename: `${logDirectory}/combined.log`, level: 'info' })
]
});
// Add console transport for non-production environments
if (process.env.NODE_ENV !== 'production') {
logger.add(new transports.Console({
format: customFormat
}));
}
// Add integration with Loggly if API key and subdomain are available
if (process.env.LOGGLY_TOKEN && process.env.LOGGLY_SUBDOMAIN) {
require('winston-loggly-bulk');
logger.add(new transports.Loggly({
token: process.env.LOGGLY_TOKEN,
subdomain: process.env.LOGGLY_SUBDOMAIN,
tags: ['Winston-NodeJS'],
json: true,
level: 'info'
}));
}
module.exports = logger;