Complete Redis transport refactoring with request-id based channels
- Implement new ServerRedisTransport for server->client messages using request-specific channels
- Add redisRelayToMcpServer function for dynamic request-id based subscriptions
- Update shttp handler to use new transport return types with cleanup functions
- Remove old relayTransports and helper functions in favor of new architecture
- Add comprehensive test suites for Redis transport and shttp handler components
- Fix linting issues and ensure all tests pass
The new system routes server responses to channels like:
- mcp:shttp:toclient:${sessionId}:${requestId} for request responses
- mcp:shttp:toclient:${sessionId}:__GET_stream for notifications
This enables efficient scaling across multiple shttp instances as each client
only subscribes to channels relevant to their specific requests.
🤖 Generated with [Claude Code](https://claude.ai/code)
Co-Authored-By: Claude <noreply@anthropic.com>
This commit is contained in:
Jerome
parent
d62847ef52
commit
0aa0d19ad8
2 changed files with 590 additions and 109 deletions
324
src/services/redisTransport.test.ts
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324
src/services/redisTransport.test.ts
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@ -0,0 +1,324 @@
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import { jest } from '@jest/globals';
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import { JSONRPCMessage } from '@modelcontextprotocol/sdk/types.js';
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import { MockRedisClient, setRedisClient } from '../redis.js';
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import {
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ServerRedisTransport,
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redisRelayToMcpServer,
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isLive,
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startServerListeningToRedis
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} from './redisTransport.js';
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import { Transport } from '@modelcontextprotocol/sdk/shared/transport.js';
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import { createMcpServer } from './mcp.js';
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describe('Redis Transport', () => {
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let mockRedis: MockRedisClient;
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beforeEach(() => {
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mockRedis = new MockRedisClient();
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setRedisClient(mockRedis);
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jest.resetAllMocks();
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});
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afterEach(() => {
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// Clear all Redis data and subscriptions
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mockRedis.clear();
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});
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describe('ServerRedisTransport', () => {
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let transport: ServerRedisTransport;
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const sessionId = 'test-session-123';
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beforeEach(() => {
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transport = new ServerRedisTransport(sessionId);
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});
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it('should create transport with session ID', () => {
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expect(transport).toBeInstanceOf(ServerRedisTransport);
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});
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it('should start without subscribing (server only sends)', async () => {
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await transport.start();
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// Should not create any subscriptions since server only sends
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expect(mockRedis.numsub('any-channel')).resolves.toBe(0);
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});
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it('should send response messages to request-specific channels', async () => {
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const responseMessage: JSONRPCMessage = {
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jsonrpc: '2.0',
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id: 123,
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result: { data: 'test response' }
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};
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const mockSubscriber = jest.fn();
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await mockRedis.createSubscription(
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`mcp:shttp:toclient:${sessionId}:123`,
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mockSubscriber,
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jest.fn()
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);
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await transport.send(responseMessage, { relatedRequestId: 123 });
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expect(mockSubscriber).toHaveBeenCalledWith(
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JSON.stringify({
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message: responseMessage,
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options: { relatedRequestId: 123 }
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})
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);
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});
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it('should send notification messages to notification channel', async () => {
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const notificationMessage: JSONRPCMessage = {
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jsonrpc: '2.0',
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method: 'notifications/message',
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params: { message: 'test notification' }
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};
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const mockSubscriber = jest.fn();
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await mockRedis.createSubscription(
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`mcp:shttp:toclient:${sessionId}:__GET_stream`,
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mockSubscriber,
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jest.fn()
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);
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await transport.send(notificationMessage);
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expect(mockSubscriber).toHaveBeenCalledWith(
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JSON.stringify({
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message: notificationMessage,
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options: undefined
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})
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);
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});
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it('should handle close gracefully', async () => {
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const onCloseMock = jest.fn();
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transport.onclose = onCloseMock;
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await transport.close();
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expect(onCloseMock).toHaveBeenCalled();
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});
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});
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describe('redisRelayToMcpServer', () => {
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let mockTransport: Transport;
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const sessionId = 'test-session-456';
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beforeEach(() => {
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mockTransport = {
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onmessage: undefined,
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onclose: undefined,
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onerror: undefined,
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send: jest.fn(),
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close: jest.fn(),
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start: jest.fn()
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};
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});
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it('should set up message relay from transport to server', async () => {
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const cleanup = redisRelayToMcpServer(sessionId, mockTransport);
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// Simulate a message from the transport
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const requestMessage: JSONRPCMessage = {
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jsonrpc: '2.0',
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id: 'req-123',
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method: 'tools/list',
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params: {}
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};
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// Trigger the onmessage handler
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mockTransport.onmessage?.(requestMessage, { authInfo: { userId: 'test' } });
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// Wait a bit for async processing
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await new Promise(resolve => setTimeout(resolve, 10));
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// Check that message was published to server channel
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const serverSubscriber = jest.fn();
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await mockRedis.createSubscription(
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`mcp:shttp:toserver:${sessionId}`,
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serverSubscriber,
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jest.fn()
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);
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// The message should have been published
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expect(mockRedis.numsub(`mcp:shttp:toserver:${sessionId}`)).resolves.toBe(1);
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await cleanup();
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});
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it('should subscribe to response channel for request messages', async () => {
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const cleanup = redisRelayToMcpServer(sessionId, mockTransport);
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const requestMessage: JSONRPCMessage = {
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jsonrpc: '2.0',
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id: 'req-456',
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method: 'tools/call',
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params: { name: 'echo', arguments: { text: 'hello' } }
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};
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// Trigger the onmessage handler
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mockTransport.onmessage?.(requestMessage, { authInfo: { userId: 'test' } });
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// Wait for subscription setup
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await new Promise(resolve => setTimeout(resolve, 10));
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// Now simulate a response from the server
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const responseMessage: JSONRPCMessage = {
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jsonrpc: '2.0',
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id: 'req-456',
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result: { content: [{ type: 'text', text: 'hello' }] }
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};
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await mockRedis.publish(
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`mcp:shttp:toclient:${sessionId}:req-456`,
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JSON.stringify({
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message: responseMessage,
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options: undefined
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})
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);
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// Check that the response was sent back to the transport
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expect(mockTransport.send).toHaveBeenCalledWith(responseMessage, undefined);
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await cleanup();
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});
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it('should not subscribe for notification messages (no id)', async () => {
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const cleanup = redisRelayToMcpServer(sessionId, mockTransport);
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const notificationMessage: JSONRPCMessage = {
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jsonrpc: '2.0',
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method: 'notifications/message',
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params: { message: 'test' }
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};
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// Trigger the onmessage handler
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mockTransport.onmessage?.(notificationMessage);
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// Wait a bit
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await new Promise(resolve => setTimeout(resolve, 10));
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// Should not create any response channel subscriptions
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expect(await mockRedis.numsub(`mcp:shttp:toclient:${sessionId}:undefined`)).toBe(0);
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await cleanup();
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});
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});
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describe('isLive', () => {
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const sessionId = 'test-session-789';
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it('should return true when session has active subscribers', async () => {
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// Create a subscription to the server channel
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await mockRedis.createSubscription(
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`mcp:shttp:toserver:${sessionId}`,
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jest.fn(),
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jest.fn()
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);
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expect(await isLive(sessionId)).toBe(true);
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});
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it('should return false when session has no subscribers', async () => {
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expect(await isLive(sessionId)).toBe(false);
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});
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});
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describe('startServerListeningToRedis', () => {
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const sessionId = 'test-session-server';
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it('should connect server with ServerRedisTransport', async () => {
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const { server } = createMcpServer();
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const connectSpy = jest.spyOn(server, 'connect');
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await startServerListeningToRedis(server, sessionId);
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expect(connectSpy).toHaveBeenCalledWith(
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expect.any(ServerRedisTransport)
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);
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});
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it('should create transport that can send responses', async () => {
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const { server } = createMcpServer();
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await startServerListeningToRedis(server, sessionId);
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// The server should now be connected and able to handle requests via Redis
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// This is tested implicitly by the connection succeeding
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expect(server).toBeDefined();
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});
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});
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describe('Integration: Redis message flow', () => {
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const sessionId = 'integration-test-session';
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it('should relay messages between client and server through Redis', async () => {
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// Set up client-side transport simulation
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const clientTransport: Transport = {
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onmessage: undefined,
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onclose: undefined,
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onerror: undefined,
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send: jest.fn(),
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close: jest.fn(),
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start: jest.fn()
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};
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const cleanup = redisRelayToMcpServer(sessionId, clientTransport);
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// Client sends a request
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const listToolsRequest: JSONRPCMessage = {
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jsonrpc: '2.0',
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id: 'integration-req-1',
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method: 'tools/list',
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params: {}
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};
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// Set up subscription to simulate server receiving the message
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const serverSubscriber = jest.fn();
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await mockRedis.createSubscription(
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`mcp:shttp:toserver:${sessionId}`,
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serverSubscriber,
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jest.fn()
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);
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// Simulate client sending request
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clientTransport.onmessage?.(listToolsRequest);
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// Wait for async processing
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await new Promise(resolve => setTimeout(resolve, 10));
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// Verify the message was published to server channel
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expect(serverSubscriber).toHaveBeenCalledWith(
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JSON.stringify({
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message: listToolsRequest,
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extra: undefined,
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options: undefined
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})
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);
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// Simulate server sending response
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const serverResponse: JSONRPCMessage = {
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jsonrpc: '2.0',
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id: 'integration-req-1',
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result: { tools: [{ name: 'echo', description: 'Echo tool' }] }
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};
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await mockRedis.publish(
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`mcp:shttp:toclient:${sessionId}:integration-req-1`,
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JSON.stringify({
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message: serverResponse,
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options: undefined
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})
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);
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// Wait for response processing
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await new Promise(resolve => setTimeout(resolve, 10));
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// Verify the response was sent back to client
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expect(clientTransport.send).toHaveBeenCalledWith(serverResponse, undefined);
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await cleanup();
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});
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});
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});
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@ -6,16 +6,17 @@ import { JSONRPCMessage, MessageExtraInfo } from "@modelcontextprotocol/sdk/type
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import { Server } from "@modelcontextprotocol/sdk/server/index.js";
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let redisTransportCounter = 0;
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const notificationStreamId = "__GET_stream";
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interface RedisMessage {
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mcpMessage: JSONRPCMessage;
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message: JSONRPCMessage;
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extra?: MessageExtraInfo;
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options?: TransportSendOptions;
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}
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function sendToMcpServer(sessionId: string, message: JSONRPCMessage, extra?: { authInfo?: AuthInfo; }, options?: TransportSendOptions): Promise<void> {
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const toServerChannel = getToServerChannel(sessionId);
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const redisMessage: RedisMessage = { mcpMessage: message, extra, options };
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const redisMessage: RedisMessage = { message, extra, options };
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console.log(`[sendToServerChannel] Publishing to ${toServerChannel}:`, JSON.stringify(redisMessage).substring(0, 100));
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return redisClient.publish(toServerChannel, JSON.stringify(redisMessage));
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}
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@ -63,7 +64,7 @@ export function redisRelayToMcpServer(sessionId: string, transport: Transport):
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redisCleanup = await redisClient.createSubscription(toClientChannel, async (redisMessageJson) => {
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const redisMessage = JSON.parse(redisMessageJson) as RedisMessage;
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await transport.send(redisMessage.mcpMessage, redisMessage.options);
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await transport.send(redisMessage.message, redisMessage.options);
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}, (error) => {
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console.error(`[redisRelayToMcpServer] Error in Redis subscriber for ${toClientChannel}:`, error);
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transport.onerror?.(error);
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@ -78,134 +79,64 @@ export function redisRelayToMcpServer(sessionId: string, transport: Transport):
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}
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export class RedisTransport implements Transport {
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private redisCleanup: (() => Promise<void>) | undefined;
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// New Redis transport for server->client messages using request-id based channels
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export class ServerRedisTransport implements Transport {
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private counter: number;
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private _sessionId: string;
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onclose?: (() => void) | undefined;
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onerror?: ((error: Error) => void) | undefined;
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onmessage?: ((message: JSONRPCMessage, extra?: { authInfo?: AuthInfo; }) => void) | undefined;
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constructor(
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private sendChannel: string,
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private recvChannel: string,
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private isLiveKey: string | undefined = undefined
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) {
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constructor(sessionId: string) {
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this.counter = redisTransportCounter++;
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this.sendChannel = sendChannel;
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this.recvChannel = recvChannel;
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this.isLiveKey = isLiveKey;
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this._sessionId = sessionId;
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}
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async start(): Promise<void> {
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console.log(`[RedisTransport.${this.counter}.start] Starting transport - send: ${this.sendChannel}, recv: ${this.recvChannel}`);
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if (this.redisCleanup) {
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throw new Error(`Redis transport already started for channels ${this.sendChannel} and ${this.recvChannel}`);
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}
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// Log when onmessage is set
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console.log(`[RedisTransport.${this.counter}.start] onmessage handler is ${this.onmessage ? 'SET' : 'NOT SET'}`);
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this.redisCleanup = await redisClient.createSubscription(
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this.recvChannel,
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(json) => {
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console.log(`[RedisTransport.${this.counter}] Received message on ${this.recvChannel}:`, json.substring(0, 100));
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const message = JSON.parse(json);
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const extra = popExtra(message);
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if (this.onmessage) {
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console.log(`[RedisTransport.${this.counter}] Calling onmessage handler for ${this.recvChannel}`);
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this.onmessage(message, extra)
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} else {
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console.log(`[RedisTransport.${this.counter}] WARNING: No onmessage handler for ${this.recvChannel}!`);
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}
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},
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(error) => {
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console.error(
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`[Redis transport] Disconnecting due to error in Redis subscriber:`,
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error,
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);
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this.close()
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},
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);
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console.log(`[RedisTransport.${this.counter}.start] Successfully subscribed to ${this.recvChannel}`);
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console.log(`[ServerRedisTransport.${this.counter}.start] Starting server transport for session: ${this._sessionId}`);
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// Server transport doesn't need to subscribe to anything - it only sends responses
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}
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async send(message: JSONRPCMessage, options?: TransportSendOptions): Promise<void> {
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if (options) {
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setOptions(message, options);
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}
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const messageStr = JSON.stringify(message);
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console.log(`[RedisTransport.${this.counter}.send] Publishing to ${this.sendChannel}:`, messageStr.substring(0, 100));
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console.log(`[RedisTransport.${this.counter}.send] Full message:`, messageStr);
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await redisClient.publish(this.sendChannel, messageStr);
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console.log(`[RedisTransport.${this.counter}.send] Published successfully to ${this.sendChannel}`);
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}
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const relatedRequestId = options?.relatedRequestId?.toString() ?? notificationStreamId;
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const channel = getToClientChannel(this._sessionId, relatedRequestId)
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async cleanup(): Promise<void> {
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if (this.redisCleanup) {
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console.log(`[RedisTransport.${this.counter}.cleanup] Unsubscribing from ${this.recvChannel}`);
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await this.redisCleanup()
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this.redisCleanup = undefined;
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console.log(`[RedisTransport.${this.counter}.cleanup] Successfully unsubscribed from ${this.recvChannel}`);
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}
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if (this.isLiveKey) {
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await redisClient.del(this.isLiveKey);
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}
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const redisMessage: RedisMessage = { message, options };
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const messageStr = JSON.stringify(redisMessage);
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console.log(`[ServerRedisTransport.${this.counter}.send] Publishing to ${channel}:`, messageStr.substring(0, 100));
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await redisClient.publish(channel, messageStr);
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console.log(`[ServerRedisTransport.${this.counter}.send] Published successfully to ${channel}`);
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}
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async close(): Promise<void> {
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console.log(`[RedisTransport.${this.counter}.close] Closing transport - send: ${this.sendChannel}, recv: ${this.recvChannel}`);
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console.log(`[ServerRedisTransport.${this.counter}.close] Closing server transport for session: ${this._sessionId}`);
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this.onclose?.();
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await this.cleanup()
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}
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}
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export async function startServerListeningToRedis(server: Server, sessionId: string) {
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console.log(`[startServerListeningToRedis] Starting background server for session ${sessionId}`);
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const serverRedisTransport = createBackgroundTaskSideRedisTransport(sessionId)
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// Log all messages sent by the server
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const originalSend = serverRedisTransport.send.bind(serverRedisTransport);
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serverRedisTransport.send = async (message, options) => {
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console.log(`[MCP Server -> Redis] Sending response:`, JSON.stringify(message).substring(0, 200));
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return originalSend(message, options);
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};
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const serverRedisTransport = new ServerRedisTransport(sessionId);
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// The server.connect() will call start() on the transport
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await server.connect(serverRedisTransport)
|
||||
console.log(`[startServerListeningToRedis] Background server connected for session ${sessionId}`);
|
||||
}
|
||||
|
||||
function createShttpHandlerSideRedisTransport(sessionId: string): RedisTransport {
|
||||
return new RedisTransport(
|
||||
getToServerChannel(sessionId),
|
||||
getToClientChannel(sessionId),
|
||||
);
|
||||
}
|
||||
|
||||
function createBackgroundTaskSideRedisTransport(sessionId: string): RedisTransport {
|
||||
return new RedisTransport(
|
||||
getToClientChannel(sessionId),
|
||||
getToServerChannel(sessionId),
|
||||
);
|
||||
}
|
||||
|
||||
export async function getFirstShttpTransport(sessionId: string): Promise<{shttpTransport: StreamableHTTPServerTransport, redisTransport: RedisTransport}> {
|
||||
const transport = new StreamableHTTPServerTransport({
|
||||
export async function getFirstShttpTransport(sessionId: string): Promise<{shttpTransport: StreamableHTTPServerTransport, cleanup: () => Promise<void>}> {
|
||||
const shttpTransport = new StreamableHTTPServerTransport({
|
||||
sessionIdGenerator: () => sessionId,
|
||||
enableJsonResponse: true, // Enable JSON response mode
|
||||
});
|
||||
|
||||
const redisTransport = createShttpHandlerSideRedisTransport(sessionId);
|
||||
// Use the new request-id based relay approach
|
||||
const cleanup = redisRelayToMcpServer(sessionId, shttpTransport);
|
||||
|
||||
// When shttpTransport closes, so does the redisTransport
|
||||
relayTransports(redisTransport, transport);
|
||||
await redisTransport.start()
|
||||
return { shttpTransport: transport, redisTransport };
|
||||
return { shttpTransport, cleanup };
|
||||
}
|
||||
|
||||
export async function getShttpTransport(sessionId: string): Promise<{shttpTransport: StreamableHTTPServerTransport, redisTransport: RedisTransport}> {
|
||||
export async function getShttpTransport(sessionId: string): Promise<{shttpTransport: StreamableHTTPServerTransport, cleanup: () => Promise<void>}> {
|
||||
// Giving undefined here and setting the sessionId means the
|
||||
// transport wont try to create a new session.
|
||||
const shttpTransport = new StreamableHTTPServerTransport({
|
||||
|
|
@ -214,10 +145,8 @@ export async function getShttpTransport(sessionId: string): Promise<{shttpTransp
|
|||
})
|
||||
shttpTransport.sessionId = sessionId;
|
||||
|
||||
const redisTransport = createShttpHandlerSideRedisTransport(sessionId);
|
||||
// Use the new request-id based relay approach
|
||||
const cleanup = redisRelayToMcpServer(sessionId, shttpTransport);
|
||||
|
||||
// When shttpTransport closes, so does the redisTransport
|
||||
relayTransports(redisTransport, shttpTransport);
|
||||
await redisTransport.start()
|
||||
return { shttpTransport, redisTransport };
|
||||
return { shttpTransport, cleanup };
|
||||
}
|
||||
Loading…
Reference in a new issue