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| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 | /** * V3 MCP WebSocket Transport * * Standalone WebSocket transport for MCP communication: * - Native WebSocket server without HTTP dependency * - Binary message support for efficiency * - Heartbeat/ping-pong for connection health * - Automatic reconnection handling * * Performance Targets: * - Message latency: <3ms * - Connection overhead: <10ms */ import { EventEmitter } from 'events'; import { WebSocketServer, WebSocket, RawData } from 'ws'; import { createServer, Server } from 'http'; import { ITransport, TransportType, MCPRequest, MCPResponse, MCPNotification, RequestHandler, NotificationHandler, TransportHealthStatus, ILogger, AuthConfig, } from '../types.js'; /** * WebSocket Transport Configuration */ export interface WebSocketTransportConfig { host: string; port: number; path?: string; maxConnections?: number; heartbeatInterval?: number; heartbeatTimeout?: number; maxMessageSize?: number; auth?: AuthConfig; enableBinaryMode?: boolean; } /** * Client connection info */ interface ClientConnection { id: string; ws: WebSocket; createdAt: Date; lastActivity: Date; messageCount: number; isAlive: boolean; isAuthenticated: boolean; } /** * WebSocket Transport Implementation */ export class WebSocketTransport extends EventEmitter implements ITransport { public readonly type: TransportType = 'websocket'; private requestHandler?: RequestHandler; private notificationHandler?: NotificationHandler; private server?: Server; private wss?: WebSocketServer; private clients: Map<string, ClientConnection> = new Map(); private heartbeatTimer?: NodeJS.Timeout; private running = false; private connectionCounter = 0; // Statistics private messagesReceived = 0; private messagesSent = 0; private errors = 0; private totalConnections = 0; constructor( private readonly logger: ILogger, private readonly config: WebSocketTransportConfig ) { super(); } /** * Start the transport */ async start(): Promise<void> { if (this.running) { throw new Error('WebSocket transport already running'); } this.logger.info('Starting WebSocket transport', { host: this.config.host, port: this.config.port, path: this.config.path || '/ws', }); // Create HTTP server for WebSocket upgrade this.server = createServer((req, res) => { // Simple HTTP response for non-WebSocket requests res.writeHead(426, { 'Content-Type': 'text/plain' }); res.end('Upgrade Required - WebSocket connection expected'); }); // Create WebSocket server this.wss = new WebSocketServer({ server: this.server, path: this.config.path || '/ws', maxPayload: this.config.maxMessageSize || 10 * 1024 * 1024, perMessageDeflate: true, // Enable compression }); this.setupWebSocketHandlers(); this.startHeartbeat(); // Start server await new Promise<void>((resolve, reject) => { this.server!.listen(this.config.port, this.config.host, () => { resolve(); }); this.server!.on('error', reject); }); this.running = true; this.logger.info('WebSocket transport started', { url: `ws://${this.config.host}:${this.config.port}${this.config.path || '/ws'}`, }); } /** * Stop the transport */ async stop(): Promise<void> { if (!this.running) { return; } this.logger.info('Stopping WebSocket transport'); this.running = false; this.stopHeartbeat(); // Close all client connections for (const client of this.clients.values()) { try { client.ws.close(1000, 'Server shutting down'); } catch { // Ignore errors } } this.clients.clear(); // Close WebSocket server if (this.wss) { this.wss.close(); this.wss = undefined; } // Close HTTP server if (this.server) { await new Promise<void>((resolve) => { this.server!.close(() => resolve()); }); this.server = undefined; } this.logger.info('WebSocket transport stopped'); } /** * Register request handler */ onRequest(handler: RequestHandler): void { this.requestHandler = handler; } /** * Register notification handler */ onNotification(handler: NotificationHandler): void { this.notificationHandler = handler; } /** * Get health status */ async getHealthStatus(): Promise<TransportHealthStatus> { return { healthy: this.running, metrics: { messagesReceived: this.messagesReceived, messagesSent: this.messagesSent, errors: this.errors, activeConnections: this.clients.size, totalConnections: this.totalConnections, }, }; } /** * Send notification to all connected clients */ async sendNotification(notification: MCPNotification): Promise<void> { const message = this.serializeMessage(notification); for (const client of this.clients.values()) { try { if (client.ws.readyState === WebSocket.OPEN) { client.ws.send(message); this.messagesSent++; } } catch (error) { this.logger.error('Failed to send notification', { clientId: client.id, error }); this.errors++; } } } /** * Send notification to specific client */ async sendToClient(clientId: string, notification: MCPNotification): Promise<boolean> { const client = this.clients.get(clientId); if (!client || client.ws.readyState !== WebSocket.OPEN) { return false; } try { client.ws.send(this.serializeMessage(notification)); this.messagesSent++; return true; } catch (error) { this.logger.error('Failed to send to client', { clientId, error }); this.errors++; return false; } } /** * Get connected clients */ getClients(): string[] { return Array.from(this.clients.keys()); } /** * Get client info */ getClientInfo(clientId: string): ClientConnection | undefined { return this.clients.get(clientId); } /** * Disconnect specific client */ disconnectClient(clientId: string, reason = 'Disconnected by server'): boolean { const client = this.clients.get(clientId); if (!client) { return false; } try { client.ws.close(1000, reason); return true; } catch { return false; } } /** * Setup WebSocket handlers */ private setupWebSocketHandlers(): void { if (!this.wss) return; this.wss.on('connection', (ws, req) => { // Check max connections if (this.config.maxConnections && this.clients.size >= this.config.maxConnections) { this.logger.warn('Max connections reached, rejecting client'); ws.close(1013, 'Server at capacity'); return; } const clientId = `client-${++this.connectionCounter}`; const client: ClientConnection = { id: clientId, ws, createdAt: new Date(), lastActivity: new Date(), messageCount: 0, isAlive: true, isAuthenticated: !this.config.auth?.enabled, }; this.clients.set(clientId, client); this.totalConnections++; this.logger.info('Client connected', { id: clientId, total: this.clients.size, }); // Setup message handler ws.on('message', async (data) => { await this.handleMessage(client, data); }); // Setup pong handler for heartbeat ws.on('pong', () => { client.isAlive = true; }); // Setup close handler ws.on('close', (code, reason) => { this.clients.delete(clientId); this.logger.info('Client disconnected', { id: clientId, code, reason: reason.toString(), total: this.clients.size, }); this.emit('client:disconnected', clientId); }); // Setup error handler ws.on('error', (error) => { this.logger.error('Client error', { id: clientId, error }); this.errors++; this.clients.delete(clientId); }); this.emit('client:connected', clientId); }); } /** * Handle incoming message */ private async handleMessage(client: ClientConnection, data: RawData): Promise<void> { client.lastActivity = new Date(); client.messageCount++; this.messagesReceived++; try { const message = this.parseMessage(data); // Check authentication for non-authenticated clients if (!client.isAuthenticated && this.config.auth?.enabled) { if (message.method !== 'authenticate') { client.ws.send(this.serializeMessage({ jsonrpc: '2.0', id: message.id || null, error: { code: -32001, message: 'Authentication required' }, } as MCPResponse)); return; } } if (message.jsonrpc !== '2.0') { client.ws.send(this.serializeMessage({ jsonrpc: '2.0', id: message.id || null, error: { code: -32600, message: 'Invalid JSON-RPC version' }, } as MCPResponse)); return; } if (message.id === undefined) { // Notification if (this.notificationHandler) { await this.notificationHandler(message as MCPNotification); } } else { // Request if (!this.requestHandler) { client.ws.send(this.serializeMessage({ jsonrpc: '2.0', id: message.id, error: { code: -32603, message: 'No request handler' }, } as MCPResponse)); return; } const startTime = performance.now(); const response = await this.requestHandler(message as MCPRequest); const duration = performance.now() - startTime; this.logger.debug('Request processed', { clientId: client.id, method: message.method, duration: `${duration.toFixed(2)}ms`, }); client.ws.send(this.serializeMessage(response)); this.messagesSent++; } } catch (error) { this.errors++; this.logger.error('Message handling error', { clientId: client.id, error }); try { client.ws.send(this.serializeMessage({ jsonrpc: '2.0', id: null, error: { code: -32700, message: 'Parse error' }, } as MCPResponse)); } catch { // Ignore send errors } } } /** * Parse incoming message */ private parseMessage(data: RawData): any { if (this.config.enableBinaryMode && Buffer.isBuffer(data)) { // Could implement binary protocol here return JSON.parse(data.toString()); } return JSON.parse(data.toString()); } /** * Serialize outgoing message */ private serializeMessage(message: MCPResponse | MCPNotification): string | Buffer { if (this.config.enableBinaryMode) { // Could implement binary protocol here return JSON.stringify(message); } return JSON.stringify(message); } /** * Start heartbeat interval */ private startHeartbeat(): void { const interval = this.config.heartbeatInterval || 30000; // 30 seconds const timeout = this.config.heartbeatTimeout || 10000; // 10 seconds this.heartbeatTimer = setInterval(() => { for (const client of this.clients.values()) { if (!client.isAlive) { // Client didn't respond to last ping this.logger.warn('Client heartbeat timeout', { id: client.id }); client.ws.terminate(); this.clients.delete(client.id); continue; } client.isAlive = false; try { client.ws.ping(); } catch { // Ignore ping errors } } }, interval); } /** * Stop heartbeat interval */ private stopHeartbeat(): void { if (this.heartbeatTimer) { clearInterval(this.heartbeatTimer); this.heartbeatTimer = undefined; } } } /** * Create WebSocket transport */ export function createWebSocketTransport( logger: ILogger, config: WebSocketTransportConfig ): WebSocketTransport { return new WebSocketTransport(logger, config); } |