Universal MCP Server

import winston from 'winston'; import { v4 as uuidv4 } from 'uuid'; export interface LogContext { requestId?: string; operation?: string; uri?: string; toolName?: string; [key: string]: unknown; } class MCPLogger { private logger: winston.Logger; private sessionId: string; constructor() { this.sessionId = uuidv4(); // 構造化ロギング設定 this.logger = winston.createLogger({ level: process.env.LOG_LEVEL || 'info', format: winston.format.combine( winston.format.timestamp({ format: 'YYYY-MM-DD HH:mm:ss.SSS' }), winston.format.errors({ stack: true }), winston.format.json() ), defaultMeta: { sessionId: this.sessionId, serverType: 'mcp-universal' }, transports: [ // ファイルベースのロギング 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, maxFiles: 5 }), // 標準エラー出力（MCPプロトコルに準拠） new winston.transports.Console({ format: winston.format.combine( winston.format.colorize(), winston.format.printf(({ timestamp, level, message, ...meta }) => { const metaStr = Object.keys(meta).length ? `\n${JSON.stringify(meta, null, 2)}` : ''; return `[${timestamp}] ${level}: ${message}${metaStr}`; }) ), stderrLevels: ['error', 'warn', 'info', 'debug'] }) ] }); } info(message: string, context?: LogContext) { this.logger.info(message, { ...context, requestId: context?.requestId || uuidv4() }); } warn(message: string, context?: LogContext) { this.logger.warn(message, { ...context, requestId: context?.requestId || uuidv4() }); } error(message: string, error?: Error, context?: LogContext) { this.logger.error(message, { ...context, requestId: context?.requestId || uuidv4(), error: error ? { name: error.name, message: error.message, stack: error.stack } : undefined }); } debug(message: string, context?: LogContext) { this.logger.debug(message, { ...context, requestId: context?.requestId || uuidv4() }); } getSessionId(): string { return this.sessionId; } } export const logger = new MCPLogger();