import winston, { Logger as WinstonLogger } from 'winston';
/**
* Logger utility using Winston
*/
export class Logger {
private static instance: Logger;
private logger: WinstonLogger;
private constructor() {
const level = process.env.LOG_LEVEL || 'info';
const format = process.env.LOG_FORMAT || 'pretty';
const logFormat = format === 'json'
? winston.format.combine(
winston.format.timestamp(),
winston.format.errors({ stack: true }),
winston.format.json()
)
: winston.format.combine(
winston.format.timestamp({ format: 'YYYY-MM-DD HH:mm:ss' }),
winston.format.errors({ stack: true }),
winston.format.colorize(),
winston.format.printf(({ timestamp, level, message, ...meta }) => {
const metaStr = Object.keys(meta).length ? ` ${JSON.stringify(meta)}` : '';
return `${timestamp} [${level}] ${message}${metaStr}`;
})
);
this.logger = winston.createLogger({
level,
format: logFormat,
transports: [
new winston.transports.Console(),
],
});
}
static getInstance(): Logger {
if (!Logger.instance) {
Logger.instance = new Logger();
}
return Logger.instance;
}
debug(message: string, meta?: any): void {
this.logger.debug(message, meta);
}
info(message: string, meta?: any): void {
this.logger.info(message, meta);
}
warn(message: string, meta?: any): void {
this.logger.warn(message, meta);
}
error(message: string, meta?: any): void {
this.logger.error(message, meta);
}
child(meta: any): Logger {
const childLogger = new Logger();
childLogger.logger = this.logger.child(meta);
return childLogger;
}
}
export default Logger;
