Advanced MCP Server

import fs from 'fs'; import path from 'path'; export type LogLevel = 'DEBUG' | 'INFO' | 'WARN' | 'ERROR'; export interface LogEntry { timestamp: string; level: LogLevel; message: string; metadata?: any; service?: string; requestId?: string; } export class Logger { private logFilePath: string; private minLevel: LogLevel; private service: string; constructor( logFilePath: string = './logs/mcp-server.log', minLevel: LogLevel = 'INFO', service: string = 'mcp-server' ) { this.logFilePath = logFilePath; this.minLevel = minLevel; this.service = service; // Ensure logs directory exists const logDir = path.dirname(this.logFilePath); if (!fs.existsSync(logDir)) { fs.mkdirSync(logDir, { recursive: true }); } } /** * Log an info message * @param message Message to log * @param metadata Additional metadata * @param requestId Request ID for tracing */ public info(message: string, metadata?: any, requestId?: string): void { this.log('INFO', message, metadata, requestId); } /** * Log a warning message * @param message Message to log * @param metadata Additional metadata * @param requestId Request ID for tracing */ public warn(message: string, metadata?: any, requestId?: string): void { this.log('WARN', message, metadata, requestId); } /** * Log an error message * @param message Message to log * @param metadata Additional metadata * @param requestId Request ID for tracing */ public error(message: string, metadata?: any, requestId?: string): void { this.log('ERROR', message, metadata, requestId); } /** * Log a debug message * @param message Message to log * @param metadata Additional metadata * @param requestId Request ID for tracing */ public debug(message: string, metadata?: any, requestId?: string): void { this.log('DEBUG', message, metadata, requestId); } /** * Write a log entry * @param level Log level * @param message Message to log * @param metadata Additional metadata * @param requestId Request ID for tracing */ private log(level: LogLevel, message: string, metadata?: any, requestId?: string): void { // Check if we should log this level if (!this.shouldLog(level)) { return; } const timestamp = new Date().toISOString(); const logEntry: LogEntry = { timestamp, level, message, metadata, service: this.service, requestId }; // Log to console with color coding const consoleMessage = `[${timestamp}] [${this.service}] ${level}: ${message}`; switch (level) { case 'ERROR': console.error(consoleMessage, metadata || ''); break; case 'WARN': console.warn(consoleMessage, metadata || ''); break; case 'INFO': console.info(consoleMessage, metadata || ''); break; case 'DEBUG': console.debug(consoleMessage, metadata || ''); break; } // Log to file const logLine = JSON.stringify(logEntry) + '\n'; fs.appendFileSync(this.logFilePath, logLine); } /** * Determine if a log level should be logged based on the minimum level * @param level The level to check * @returns True if the level should be logged */ private shouldLog(level: LogLevel): boolean { const levels: LogLevel[] = ['DEBUG', 'INFO', 'WARN', 'ERROR']; const minLevelIndex = levels.indexOf(this.minLevel); const levelIndex = levels.indexOf(level); return levelIndex >= minLevelIndex; } /** * Create a child logger with a specific service name * @param service Service name * @returns New Logger instance */ public child(service: string): Logger { return new Logger(this.logFilePath, this.minLevel, service); } }