voyage-and-consumption-mcp-server/dist/utils/logger.js

Voyage and consumption management server handling vessel position tracking, ETA monitoring, fuel consumption, lube oil consumption, fresh water production and weather data

import winston from 'winston';
import path from 'path';
import fs from 'fs';
// Ensure logs directory exists with error handling
let logsDir;
let canWriteLogs = false;
try {
    logsDir = path.join(process.cwd(), 'logs');
    if (!fs.existsSync(logsDir)) {
        fs.mkdirSync(logsDir, { recursive: true });
    }
    canWriteLogs = true;
}
catch (error) {
    console.warn('Could not create logs directory, file logging will be disabled:', error);
    canWriteLogs = false;
}
// Determine environment
const NODE_ENV = process.env.NODE_ENV || 'development';
const isProd = NODE_ENV === 'production';
// Get service name from environment variable or use default
const SERVICE_NAME = process.env.SERVICE_NAME || 'unknown';
// Configure log level based on environment
const logLevel = isProd ? 'info' : process.env.LOG_LEVEL || 'debug';
// Custom format for production (structured JSON logs)
const productionFormat = winston.format.combine(winston.format.timestamp(), winston.format.errors({ stack: true }), winston.format.json());
// Custom format for development (colorized and readable)
const developmentFormat = winston.format.combine(winston.format.timestamp({ format: 'YYYY-MM-DD HH:mm:ss' }), winston.format.errors({ stack: true }), winston.format.colorize(), winston.format.printf(({ level, message, timestamp, ...meta }) => {
    const metaString = Object.keys(meta).length ? JSON.stringify(meta, null, 2) : '';
    return `${timestamp} [${level}]: ${message} ${metaString}`;
}));
// Create transports array
const transports = [
    // Console transport (always available)
    new winston.transports.Console({
        format: developmentFormat
    })
];
// Add file transports only if we can write to logs directory
if (canWriteLogs) {
    transports.push(new winston.transports.File({
        filename: 'logs/error.log',
        level: 'error',
        silent: !isProd && process.env.ENABLE_FILE_LOGGING !== 'true'
    }), new winston.transports.File({
        filename: 'logs/combined.log',
        silent: !isProd && process.env.ENABLE_FILE_LOGGING !== 'true'
    }));
}
// Create exception handlers
const exceptionHandlers = [
    new winston.transports.Console({ format: developmentFormat })
];
if (canWriteLogs) {
    exceptionHandlers.unshift(new winston.transports.File({ filename: 'logs/exceptions.log' }));
}
// Create and export the logger
export const logger = winston.createLogger({
    level: logLevel,
    format: isProd ? productionFormat : developmentFormat,
    defaultMeta: { service: SERVICE_NAME, environment: NODE_ENV },
    transports,
    exceptionHandlers,
    exitOnError: false
});
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