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import { platform, arch } from 'os'; import { MCPServerConfig, MCPRequest, MCPResponse, MCPNotification, MCPSession, MCPTool, MCPInitializeParams, MCPInitializeResult, MCPCapabilities, MCPProtocolVersion, MCPServerMetrics, MCPServerError, ErrorCodes, ITransport, TransportType, ILogger, ToolContext, } from './types.js'; import { ToolRegistry, createToolRegistry } from './tool-registry.js'; import { SessionManager, createSessionManager } from './session-manager.js'; import { ConnectionPool, createConnectionPool } from './connection-pool.js'; import { createTransport, TransportManager, createTransportManager } from './transport/index.js'; /** * Default server configuration */ const DEFAULT_CONFIG: Partial<MCPServerConfig> = { name: 'Claude-Flow MCP Server V3', version: '3.0.0', transport: 'stdio', host: 'localhost', port: 3000, enableMetrics: true, enableCaching: true, cacheTTL: 10000, logLevel: 'info', requestTimeout: 30000, maxRequestSize: 10 * 1024 * 1024, }; /** * MCP Server Interface */ export interface IMCPServer { start(): Promise<void>; stop(): Promise<void>; registerTool(tool: MCPTool): boolean; registerTools(tools: MCPTool[]): { registered: number; failed: string[] }; getHealthStatus(): Promise<{ healthy: boolean; error?: string; metrics?: Record<string, number>; }>; getMetrics(): MCPServerMetrics; getSessions(): MCPSession[]; getSession(sessionId: string): MCPSession | undefined; terminateSession(sessionId: string): boolean; } /** * V3 MCP Server */ export class MCPServer extends EventEmitter implements IMCPServer { private readonly config: MCPServerConfig; private readonly toolRegistry: ToolRegistry; private readonly sessionManager: SessionManager; private readonly connectionPool?: ConnectionPool; private readonly transportManager: TransportManager; private transport?: ITransport; private running = false; private startTime?: Date; private startupDuration?: number; private currentSession?: MCPSession; // Server information private readonly serverInfo = { name: 'Claude-Flow MCP Server V3', version: '3.0.0', }; // Protocol version private readonly protocolVersion: MCPProtocolVersion = { major: 2024, minor: 11, patch: 5, }; // Server capabilities private readonly capabilities: MCPCapabilities = { logging: { level: 'info' }, tools: { listChanged: true }, resources: { listChanged: false, subscribe: false }, prompts: { listChanged: false }, }; // Request statistics private requestStats = { total: 0, successful: 0, failed: 0, totalResponseTime: 0, }; constructor( config: Partial<MCPServerConfig>, private readonly logger: ILogger, private readonly orchestrator?: unknown, private readonly swarmCoordinator?: unknown ) { super(); this.config = { ...DEFAULT_CONFIG, ...config } as MCPServerConfig; // Initialize components this.toolRegistry = createToolRegistry(logger); this.sessionManager = createSessionManager(logger, { maxSessions: 100, sessionTimeout: 30 * 60 * 1000, }); this.transportManager = createTransportManager(logger); // Initialize connection pool if enabled if (this.config.connectionPool) { this.connectionPool = createConnectionPool( this.config.connectionPool, logger, this.config.transport ); } // Setup event handlers this.setupEventHandlers(); } /** * Start the MCP server */ async start(): Promise<void> { if (this.running) { throw new MCPServerError('Server already running'); } const startTime = performance.now(); this.startTime = new Date(); this.logger.info('Starting MCP server', { name: this.config.name, version: this.config.version, transport: this.config.transport, }); try { // Create and start transport this.transport = createTransport(this.config.transport, this.logger, { type: this.config.transport, host: this.config.host, port: this.config.port, corsEnabled: this.config.corsEnabled, corsOrigins: this.config.corsOrigins, auth: this.config.auth, maxRequestSize: String(this.config.maxRequestSize), requestTimeout: this.config.requestTimeout, } as any); // Setup request handler this.transport.onRequest(async (request) => { return await this.handleRequest(request); }); // Setup notification handler this.transport.onNotification(async (notification) => { await this.handleNotification(notification); }); // Start transport await this.transport.start(); // Register built-in tools await this.registerBuiltInTools(); this.running = true; this.startupDuration = performance.now() - startTime; this.logger.info('MCP server started', { startupTime: `${this.startupDuration.toFixed(2)}ms`, tools: this.toolRegistry.getToolCount(), }); this.emit('server:started', { startupTime: this.startupDuration, tools: this.toolRegistry.getToolCount(), }); } catch (error) { this.logger.error('Failed to start MCP server', { error }); throw new MCPServerError('Failed to start server', ErrorCodes.INTERNAL_ERROR, { error }); } } /** * Stop the MCP server */ async stop(): Promise<void> { if (!this.running) { return; } this.logger.info('Stopping MCP server'); try { // Stop transport if (this.transport) { await this.transport.stop(); this.transport = undefined; } // Clear sessions this.sessionManager.clearAll(); // Clear connection pool if (this.connectionPool) { await this.connectionPool.clear(); } this.running = false; this.currentSession = undefined; this.logger.info('MCP server stopped'); this.emit('server:stopped'); } catch (error) { this.logger.error('Error stopping MCP server', { error }); throw error; } } /** * Register a tool */ registerTool(tool: MCPTool): boolean { return this.toolRegistry.register(tool); } /** * Register multiple tools */ registerTools(tools: MCPTool[]): { registered: number; failed: string[] } { return this.toolRegistry.registerBatch(tools); } /** * Unregister a tool */ unregisterTool(name: string): boolean { return this.toolRegistry.unregister(name); } /** * Get health status */ async getHealthStatus(): Promise<{ healthy: boolean; error?: string; metrics?: Record<string, number>; }> { try { const transportHealth = this.transport ? await this.transport.getHealthStatus() : { healthy: false, error: 'Transport not initialized' }; const sessionMetrics = this.sessionManager.getSessionMetrics(); const poolStats = this.connectionPool?.getStats(); const metrics: Record<string, number> = { registeredTools: this.toolRegistry.getToolCount(), totalRequests: this.requestStats.total, successfulRequests: this.requestStats.successful, failedRequests: this.requestStats.failed, totalSessions: sessionMetrics.total, activeSessions: sessionMetrics.active, ...(transportHealth.metrics || {}), }; if (poolStats) { metrics.poolConnections = poolStats.totalConnections; metrics.poolIdleConnections = poolStats.idleConnections; metrics.poolBusyConnections = poolStats.busyConnections; } return { healthy: this.running && transportHealth.healthy, error: transportHealth.error, metrics, }; } catch (error) { return { healthy: false, error: error instanceof Error ? error.message : 'Unknown error', }; } } /** * Get server metrics */ getMetrics(): MCPServerMetrics { const sessionMetrics = this.sessionManager.getSessionMetrics(); const registryStats = this.toolRegistry.getStats(); return { totalRequests: this.requestStats.total, successfulRequests: this.requestStats.successful, failedRequests: this.requestStats.failed, averageResponseTime: this.requestStats.total > 0 ? this.requestStats.totalResponseTime / this.requestStats.total : 0, activeSessions: sessionMetrics.active, toolInvocations: Object.fromEntries( registryStats.topTools.map((t) => [t.name, t.calls]) ), errors: {}, lastReset: this.startTime || new Date(), startupTime: this.startupDuration, uptime: this.startTime ? Date.now() - this.startTime.getTime() : 0, }; } /** * Get all sessions */ getSessions(): MCPSession[] { return this.sessionManager.getActiveSessions(); } /** * Get session by ID */ getSession(sessionId: string): MCPSession | undefined { return this.sessionManager.getSession(sessionId); } /** * Terminate a session */ terminateSession(sessionId: string): boolean { const result = this.sessionManager.closeSession(sessionId, 'Terminated by server'); if (this.currentSession?.id === sessionId) { this.currentSession = undefined; } return result; } /** * Handle incoming request */ private async handleRequest(request: MCPRequest): Promise<MCPResponse> { const startTime = performance.now(); this.requestStats.total++; this.logger.debug('Handling request', { id: request.id, method: request.method, }); try { // Handle initialization if (request.method === 'initialize') { return await this.handleInitialize(request); } // Get or create session const session = this.getOrCreateSession(); // Check initialization if (!session.isInitialized && request.method !== 'initialized') { return this.createErrorResponse( request.id, ErrorCodes.SERVER_NOT_INITIALIZED, 'Server not initialized' ); } // Update session activity this.sessionManager.updateActivity(session.id); // Route request const response = await this.routeRequest(request); const duration = performance.now() - startTime; this.requestStats.successful++; this.requestStats.totalResponseTime += duration; this.logger.debug('Request completed', { id: request.id, method: request.method, duration: `${duration.toFixed(2)}ms`, }); return response; } catch (error) { const duration = performance.now() - startTime; this.requestStats.failed++; this.requestStats.totalResponseTime += duration; this.logger.error('Request failed', { id: request.id, method: request.method, error, }); return this.createErrorResponse( request.id, ErrorCodes.INTERNAL_ERROR, error instanceof Error ? error.message : 'Internal error' ); } } /** * Handle notification */ private async handleNotification(notification: MCPNotification): Promise<void> { this.logger.debug('Handling notification', { method: notification.method }); switch (notification.method) { case 'initialized': this.logger.info('Client initialized notification received'); break; case 'notifications/cancelled': this.logger.debug('Request cancelled', notification.params); break; default: this.logger.debug('Unknown notification', { method: notification.method }); } } /** * Handle initialize request */ private async handleInitialize(request: MCPRequest): Promise<MCPResponse> { const params = request.params as unknown as MCPInitializeParams | undefined; if (!params) { return this.createErrorResponse( request.id, ErrorCodes.INVALID_PARAMS, 'Invalid params' ); } // Create and initialize session const session = this.sessionManager.createSession(this.config.transport); this.sessionManager.initializeSession(session.id, params); this.currentSession = session; const result: MCPInitializeResult = { protocolVersion: this.protocolVersion, capabilities: this.capabilities, serverInfo: this.serverInfo, instructions: 'Claude-Flow MCP Server V3 ready for tool execution', }; this.logger.info('Session initialized', { sessionId: session.id, clientInfo: params.clientInfo, }); return { jsonrpc: '2.0', id: request.id, result, }; } /** * Route request to appropriate handler */ private async routeRequest(request: MCPRequest): Promise<MCPResponse> { switch (request.method) { case 'tools/list': return this.handleToolsList(request); case 'tools/call': return this.handleToolsCall(request); case 'resources/list': return this.handleResourcesList(request); case 'prompts/list': return this.handlePromptsList(request); case 'ping': return { jsonrpc: '2.0', id: request.id, result: { pong: true, timestamp: Date.now() }, }; default: // Try to execute as tool call (backwards compatibility) if (this.toolRegistry.hasTool(request.method)) { return this.handleToolExecution(request); } return this.createErrorResponse( request.id, ErrorCodes.METHOD_NOT_FOUND, `Method not found: ${request.method}` ); } } /** * Handle tools/list request */ private handleToolsList(request: MCPRequest): MCPResponse { const tools = this.toolRegistry.listTools().map((t) => ({ name: t.name, description: t.description, inputSchema: this.toolRegistry.getTool(t.name)?.inputSchema, })); return { jsonrpc: '2.0', id: request.id, result: { tools }, }; } /** * Handle tools/call request */ private async handleToolsCall(request: MCPRequest): Promise<MCPResponse> { const params = request.params as { name: string; arguments?: Record<string, unknown> }; if (!params?.name) { return this.createErrorResponse( request.id, ErrorCodes.INVALID_PARAMS, 'Tool name is required' ); } const context: ToolContext = { sessionId: this.currentSession?.id || 'unknown', requestId: request.id, orchestrator: this.orchestrator, swarmCoordinator: this.swarmCoordinator, }; const result = await this.toolRegistry.execute( params.name, params.arguments || {}, context ); return { jsonrpc: '2.0', id: request.id, result, }; } /** * Handle direct tool execution (backwards compatibility) */ private async handleToolExecution(request: MCPRequest): Promise<MCPResponse> { const context: ToolContext = { sessionId: this.currentSession?.id || 'unknown', requestId: request.id, orchestrator: this.orchestrator, swarmCoordinator: this.swarmCoordinator, }; const result = await this.toolRegistry.execute( request.method, (request.params as Record<string, unknown>) || {}, context ); return { jsonrpc: '2.0', id: request.id, result, }; } /** * Handle resources/list request */ private handleResourcesList(request: MCPRequest): MCPResponse { return { jsonrpc: '2.0', id: request.id, result: { resources: [] }, }; } /** * Handle prompts/list request */ private handlePromptsList(request: MCPRequest): MCPResponse { return { jsonrpc: '2.0', id: request.id, result: { prompts: [] }, }; } /** * Get or create current session */ private getOrCreateSession(): MCPSession { if (this.currentSession) { return this.currentSession; } const session = this.sessionManager.createSession(this.config.transport); this.currentSession = session; return session; } /** * Create error response */ private createErrorResponse( id: string | number | null, code: number, message: string ): MCPResponse { return { jsonrpc: '2.0', id, error: { code, message }, }; } /** * Register built-in tools */ private async registerBuiltInTools(): Promise<void> { // System info tool this.registerTool({ name: 'system/info', description: 'Get system information', inputSchema: { type: 'object', properties: {} }, handler: async () => ({ name: this.serverInfo.name, version: this.serverInfo.version, platform: platform(), arch: arch(), runtime: 'Node.js', uptime: this.startTime ? Date.now() - this.startTime.getTime() : 0, }), category: 'system', }); // Health check tool this.registerTool({ name: 'system/health', description: 'Get system health status', inputSchema: { type: 'object', properties: {} }, handler: async () => await this.getHealthStatus(), category: 'system', cacheable: true, cacheTTL: 2000, }); // Metrics tool this.registerTool({ name: 'system/metrics', description: 'Get server metrics', inputSchema: { type: 'object', properties: {} }, handler: async () => this.getMetrics(), category: 'system', cacheable: true, cacheTTL: 1000, }); // Tools list tool this.registerTool({ name: 'tools/list-detailed', description: 'List all registered tools with details', inputSchema: { type: 'object', properties: { category: { type: 'string', description: 'Filter by category' }, }, }, handler: async (input: unknown) => { const params = input as { category?: string }; if (params.category) { return this.toolRegistry.getByCategory(params.category); } return this.toolRegistry.listTools(); }, category: 'system', }); this.logger.info('Built-in tools registered', { count: 4, }); } /** * Setup event handlers */ private setupEventHandlers(): void { // Tool events this.toolRegistry.on('tool:registered', (name) => { this.emit('tool:registered', name); }); this.toolRegistry.on('tool:called', (data) => { this.emit('tool:called', data); }); this.toolRegistry.on('tool:completed', (data) => { this.emit('tool:completed', data); }); this.toolRegistry.on('tool:error', (data) => { this.emit('tool:error', data); }); // Session events this.sessionManager.on('session:created', (session) => { this.emit('session:created', session); }); this.sessionManager.on('session:closed', (data) => { this.emit('session:closed', data); }); this.sessionManager.on('session:expired', (session) => { this.emit('session:expired', session); }); } } /** * Create an MCP server instance */ export function createMCPServer( config: Partial<MCPServerConfig>, logger: ILogger, orchestrator?: unknown, swarmCoordinator?: unknown ): MCPServer { return new MCPServer(config, logger, orchestrator, swarmCoordinator); } |