log-vista/src/logger.js

LogVista Agent - Lightweight system monitoring and log collection for any project/language

const fs = require('fs');
const path = require('path');
const winston = require('winston');

class Logger {
  constructor() {
    // Ensure logs directory exists
    const logsDir = path.join(__dirname, '../logs');
    if (!fs.existsSync(logsDir)) {
      fs.mkdirSync(logsDir, { recursive: true });
    }

    this.logger = winston.createLogger({
      level: 'info',
      format: winston.format.combine(
        winston.format.timestamp(),
        winston.format.errors({ stack: true }),
        winston.format.json()
      ),
      defaultMeta: { service: 'logvista-agent' },
      transports: [
        // Write all logs with level 'error' and below to error.log
        new winston.transports.File({ 
          filename: path.join(logsDir, 'error.log'), 
          level: 'error' 
        }),
        // Write all logs with level 'info' and below to combined.log
        new winston.transports.File({ 
          filename: path.join(logsDir, 'combined.log') 
        })
      ]
    });

    // Add console transport for development
    if (process.env.NODE_ENV !== 'production') {
      this.logger.add(new winston.transports.Console({
        format: winston.format.combine(
          winston.format.colorize(),
          winston.format.simple()
        )
      }));
    }
  }

  info(message, meta = {}) {
    this.logger.info(message, meta);
  }

  error(message, meta = {}) {
    this.logger.error(message, meta);
  }

  warn(message, meta = {}) {
    this.logger.warn(message, meta);
  }

  debug(message, meta = {}) {
    this.logger.debug(message, meta);
  }
}

module.exports = new Logger();