postgres-mcp-tools/server/src/utils/logger.ts

PostgreSQL-based memory system with vector search capabilities for AI applications, including MCP integration for Claude

import winston from 'winston';
import dotenv from 'dotenv';

// Load environment variables
dotenv.config();

// Define log levels
const levels = {
  error: 0,
  warn: 1,
  info: 2,
  http: 3,
  debug: 4,
};

// Define log level based on environment
const level = () => {
  const env = process.env.NODE_ENV || 'development';
  const isDevelopment = env === 'development';
  return isDevelopment ? 'debug' : process.env.LOG_LEVEL || 'info';
};

// Define log colors
const colors = {
  error: 'red',
  warn: 'yellow',
  info: 'green',
  http: 'magenta',
  debug: 'blue',
};

// Add colors to winston
winston.addColors(colors);

// Create custom format
const format = winston.format.combine(
  winston.format.timestamp({ format: 'YYYY-MM-DD HH:mm:ss:ms' }),
  winston.format.printf(
    (info) => `${info.timestamp} ${info.level}: ${info.message}`,
  ),
);

// Define transport array based on environment
const transports = [
  new winston.transports.Console({
    format: winston.format.combine(
      winston.format.colorize({ all: true }),
      winston.format.printf(
        (info) => `${info.timestamp} ${info.level}: ${info.message}`,
      ),
    ),
    // Force all log levels to stderr
    stderrLevels: Object.keys(levels),
  }),
];

// Add file transport in production
const fileTransports = [];
if (process.env.NODE_ENV === 'production') {
  fileTransports.push(
    new winston.transports.File({
      filename: 'logs/error.log',
      level: 'error',
      maxsize: 5242880, // 5MB
      maxFiles: 5,
    }),
    new winston.transports.File({
      filename: 'logs/combined.log',
      maxsize: 5242880, // 5MB
      maxFiles: 5,
    }),
  );
}

// Create the logger instance
export const logger = winston.createLogger({
  level: level(),
  levels,
  format,
  transports: [
    ...transports,
    ...fileTransports
  ],
});

export default logger;