From c59d39e5d508b024d75863d28d5e6cc47039cae3 Mon Sep 17 00:00:00 2001 From: Nitin Anand Date: Tue, 15 Apr 2025 22:05:00 +0530 Subject: [PATCH 1/3] Changes to handle simultaneous connections --- package-lock.json | 696 +++++++++++++++++++++++++++++++++++++++------- package.json | 2 +- src/index.ts | 8 +- src/mcp-proxy.ts | 5 +- src/sse.ts | 64 ++++- 5 files changed, 659 insertions(+), 116 deletions(-) diff --git a/package-lock.json b/package-lock.json index e0e2f54..ad7824b 100644 --- a/package-lock.json +++ b/package-lock.json @@ -9,7 +9,7 @@ "version": "0.1.0", "license": "MIT", "dependencies": { - "@modelcontextprotocol/sdk": "0.6.0", + "@modelcontextprotocol/sdk": "1.9.0", "@types/cors": "^2.8.17", "cors": "^2.8.5", "eventsource": "^3.0.2", @@ -436,13 +436,286 @@ } }, "node_modules/@modelcontextprotocol/sdk": { - "version": "0.6.0", - "resolved": "https://registry.npmjs.org/@modelcontextprotocol/sdk/-/sdk-0.6.0.tgz", - "integrity": 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"resolved": "https://registry.npmjs.org/proxy-addr/-/proxy-addr-2.0.7.tgz", @@ -1461,6 +1827,7 @@ "version": "3.0.0", "resolved": "https://registry.npmjs.org/raw-body/-/raw-body-3.0.0.tgz", "integrity": "sha512-RmkhL8CAyCRPXCE28MMH0z2PNWQBNk2Q09ZdxM9IOOXwxwZbN+qbWaatPkdkWIKL2ZVDImrN/pK5HTRz2PcS4g==", + "license": "MIT", "dependencies": { "bytes": "3.1.2", "http-errors": "2.0.0", @@ -1493,6 +1860,54 @@ "url": "https://github.com/privatenumber/resolve-pkg-maps?sponsor=1" } }, + "node_modules/router": { + "version": "2.2.0", + "resolved": "https://registry.npmjs.org/router/-/router-2.2.0.tgz", + "integrity": "sha512-nLTrUKm2UyiL7rlhapu/Zl45FwNgkZGaCpZbIHajDYgwlJCOzLSk+cIPAnsEqV955GjILJnKbdQC1nVPz+gAYQ==", + "license": "MIT", + "dependencies": { + "debug": "^4.4.0", + "depd": "^2.0.0", + "is-promise": "^4.0.0", + "parseurl": "^1.3.3", + "path-to-regexp": "^8.0.0" + }, + "engines": { + "node": ">= 18" + } + }, + "node_modules/router/node_modules/debug": { + "version": "4.4.0", + "resolved": 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+ "engines": { + "node": ">=8" + } + }, + "node_modules/shebang-regex": { + "version": "3.0.0", + "resolved": "https://registry.npmjs.org/shebang-regex/-/shebang-regex-3.0.0.tgz", + "integrity": "sha512-7++dFhtcx3353uBaq8DDR4NuxBetBzC7ZQOhmTQInHEd6bSrXdiEyzCvG07Z44UYdLShWUyXt5M/yhz8ekcb1A==", + "license": "MIT", + "engines": { + "node": ">=8" + } + }, + "node_modules/side-channel": { + "version": "1.1.0", + "resolved": "https://registry.npmjs.org/side-channel/-/side-channel-1.1.0.tgz", + "integrity": "sha512-ZX99e6tRweoUXqR+VBrslhda51Nh5MTQwou5tnUDgbtyM0dBgmhEDtWGP/xbKn6hqfPRHujUNwz5fy/wbbhnpw==", + "license": "MIT", "dependencies": { - "define-data-property": "^1.1.4", "es-errors": "^1.3.0", - "function-bind": "^1.1.2", - "get-intrinsic": "^1.2.4", - "gopd": "^1.0.1", - "has-property-descriptors": "^1.0.2" + "object-inspect": "^1.13.3", + "side-channel-list": "^1.0.0", + "side-channel-map": "^1.0.1", + "side-channel-weakmap": "^1.0.2" + }, + "engines": { + "node": ">= 0.4" + }, + "funding": { + "url": "https://github.com/sponsors/ljharb" + } + }, + "node_modules/side-channel-list": { + "version": "1.0.0", + "resolved": "https://registry.npmjs.org/side-channel-list/-/side-channel-list-1.0.0.tgz", + "integrity": "sha512-FCLHtRD/gnpCiCHEiJLOwdmFP+wzCmDEkc9y7NsYxeF4u7Btsn1ZuwgwJGxImImHicJArLP4R0yX4c2KCrMrTA==", + "license": "MIT", + "dependencies": { + "es-errors": "^1.3.0", + "object-inspect": "^1.13.3" }, "engines": { "node": ">= 0.4" + }, + "funding": { + "url": "https://github.com/sponsors/ljharb" } }, - "node_modules/setprototypeof": { - "version": "1.2.0", - "resolved": "https://registry.npmjs.org/setprototypeof/-/setprototypeof-1.2.0.tgz", - "integrity": "sha512-E5LDX7Wrp85Kil5bhZv46j8jOeboKq5JMmYM3gVGdGH8xFpPWXUMsNrlODCrkoxMEeNi/XZIwuRvY4XNwYMJpw==" + "node_modules/side-channel-map": { + "version": "1.0.1", + "resolved": "https://registry.npmjs.org/side-channel-map/-/side-channel-map-1.0.1.tgz", + "integrity": 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"get-intrinsic": "^1.2.4", - "object-inspect": "^1.13.1" + "get-intrinsic": "^1.2.5", + "object-inspect": "^1.13.3", + "side-channel-map": "^1.0.1" }, "engines": { "node": ">= 0.4" @@ -1758,20 +2233,43 @@ "node": ">= 0.8" } }, + "node_modules/which": { + "version": "2.0.2", + "resolved": "https://registry.npmjs.org/which/-/which-2.0.2.tgz", + "integrity": "sha512-BLI3Tl1TW3Pvl70l3yq3Y64i+awpwXqsGBYWkkqMtnbXgrMD+yj7rhW0kuEDxzJaYXGjEW5ogapKNMEKNMjibA==", + "license": "ISC", + "dependencies": { + "isexe": "^2.0.0" + }, + "bin": { + "node-which": "bin/node-which" + }, + "engines": { + "node": ">= 8" + } + }, + "node_modules/wrappy": { + "version": "1.0.2", + "resolved": "https://registry.npmjs.org/wrappy/-/wrappy-1.0.2.tgz", + "integrity": "sha512-l4Sp/DRseor9wL6EvV2+TuQn63dMkPjZ/sp9XkghTEbV9KlPS1xUsZ3u7/IQO4wxtcFB4bgpQPRcR3QCvezPcQ==", + "license": "ISC" + }, "node_modules/zod": { - "version": "3.23.8", - "resolved": "https://registry.npmjs.org/zod/-/zod-3.23.8.tgz", - "integrity": 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b/package.json index c5f4ca3..fbd529e 100644 --- a/package.json +++ b/package.json @@ -21,7 +21,7 @@ "inspector": "npx @modelcontextprotocol/inspector build/index.js" }, "dependencies": { - "@modelcontextprotocol/sdk": "0.6.0", + "@modelcontextprotocol/sdk": "1.9.0", "@types/cors": "^2.8.17", "cors": "^2.8.5", "eventsource": "^3.0.2", diff --git a/src/index.ts b/src/index.ts index 4ba41ad..8c11ada 100644 --- a/src/index.ts +++ b/src/index.ts @@ -11,10 +11,14 @@ import { StdioServerTransport } from "@modelcontextprotocol/sdk/server/stdio.js"; import { createServer } from "./mcp-proxy.js"; +import { loadConfig } from "./config.js"; +import { createClients } from "./client.js"; async function main() { const transport = new StdioServerTransport(); - const { server, cleanup } = await createServer(); + const config = await loadConfig(); + const clients = await createClients(config.servers); + const { server, cleanup } = await createServer(clients); await server.connect(transport); @@ -22,6 +26,8 @@ async function main() { process.on("SIGINT", async () => { await cleanup(); await server.close(); + + await Promise.all(clients.map(({cleanup}) => cleanup())); process.exit(0); }); } diff --git a/src/mcp-proxy.ts b/src/mcp-proxy.ts index 361426a..9f8c8f2 100644 --- a/src/mcp-proxy.ts +++ b/src/mcp-proxy.ts @@ -24,10 +24,10 @@ import * as eventsource from 'eventsource'; global.EventSource = eventsource.EventSource -export const createServer = async () => { +export const createServer = async (clients) => { // Load configuration and connect to servers const config = await loadConfig(); - const connectedClients = await createClients(config.servers); + const connectedClients = clients; console.log(`Connected to ${connectedClients.length} servers`); // Maps to track which client owns which resource @@ -296,7 +296,6 @@ export const createServer = async () => { }); const cleanup = async () => { - await Promise.all(connectedClients.map(({ cleanup }) => cleanup())); }; return { server, cleanup }; diff --git a/src/sse.ts b/src/sse.ts index a9decb4..9baba7e 100644 --- a/src/sse.ts +++ b/src/sse.ts @@ -1,38 +1,78 @@ import { SSEServerTransport } from "@modelcontextprotocol/sdk/server/sse.js"; import express from "express"; import { createServer } from "./mcp-proxy.js"; +import { createClients } from "./client.js"; +import { loadConfig } from "./config.js"; const app = express(); -const { server, cleanup } = await createServer(); +app.use((req,res,next) =>{ + console.log(req.method, req.hostname, req.path); + next(); +}); + +class Connection { + server: any; + cleanup: any; + transport?: SSEServerTransport; +} + +const transportMap: Map = new Map(); -let transport: SSEServerTransport; +const config = await loadConfig(); +const clients = await createClients(config.servers); app.get("/sse", async (req, res) => { - console.log("Received connection"); - transport = new SSEServerTransport("/message", res); + + const { server, cleanup } = await createServer(clients); + const transport = new SSEServerTransport(`/message`, res); + + console.log(`Created new connection with id: ${transport.sessionId}`); + + transportMap.set(transport.sessionId, { + server, + cleanup, + transport + }); + await server.connect(transport); server.onerror = (err) => { console.error(`Server onerror: ${err.stack}`) } - server.onclose = async () => { - console.log('Server onclose') - if (process.env.KEEP_SERVER_OPEN !== "1") { + server.onclose = ((sessionId) => + async () => { + console.log(`Closing ${sessionId}`); await cleanup(); await server.close(); - process.exit(0); + transportMap.delete(sessionId); } - }; + )(transport.sessionId); }); app.post("/message", async (req, res) => { - console.log("Received message"); - await transport.handlePostMessage(req, res); + const sessionId = req.query["sessionId"] as string; + console.log(`Received message for ${sessionId}`); + const transport = transportMap.get(sessionId); + await transport?.transport?.handlePostMessage(req, res); }); const PORT = process.env.PORT || 3006; -app.listen(PORT, () => { + +const server = app.listen(PORT, () => { console.log(`Server is running on port ${PORT}`); }); + +process.on("SIGINT", async () => { + console.log("Handling interrupt"); + + server.close(); + for(const entry of transportMap.values()) { + console.log(`Closing ${entry.transport?.sessionId}`); + await entry.cleanup(); + await entry.server.close(); + } + + await Promise.all(clients.map(({cleanup}) => cleanup())); +}); \ No newline at end of file From 9cff6f44f798c521c5a64a3971176f9decc22d06 Mon Sep 17 00:00:00 2001 From: Nitin Anand Date: Wed, 16 Apr 2025 12:51:16 +0530 Subject: [PATCH 2/3] Exit correctly when running in stdio mode --- src/index.ts | 18 ++++++++++-------- 1 file changed, 10 insertions(+), 8 deletions(-) diff --git a/src/index.ts b/src/index.ts index 8c11ada..894c04a 100644 --- a/src/index.ts +++ b/src/index.ts @@ -20,19 +20,21 @@ async function main() { const clients = await createClients(config.servers); const { server, cleanup } = await createServer(clients); - await server.connect(transport); + const gracefulShutdown = async (signal) => { + await transport.close(); + await server.close(); + await cleanup(); + await Promise.all(clients.map(({cleanup}) => cleanup())); + }; // Cleanup on exit - process.on("SIGINT", async () => { - await cleanup(); - await server.close(); + process.on("SIGINT", gracefulShutdown); + process.on("SIGTERM", gracefulShutdown); - await Promise.all(clients.map(({cleanup}) => cleanup())); - process.exit(0); - }); + await server.connect(transport); } main().catch((error) => { console.error("Server error:", error); process.exit(1); -}); +}) From 8f25dce866d1f464f8572bfe62882e83b03d9984 Mon Sep 17 00:00:00 2001 From: Nitin Anand Date: Wed, 16 Apr 2025 18:33:11 +0530 Subject: [PATCH 3/3] Make MCP_CONFIG_PATH an option for loading different config file --- src/config.ts | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/src/config.ts b/src/config.ts index 897195b..5a290b5 100644 --- a/src/config.ts +++ b/src/config.ts @@ -26,7 +26,7 @@ export interface Config { export const loadConfig = async (): Promise => { try { - const configPath = resolve(process.cwd(), 'config.json'); + const configPath = process.env.MCP_CONFIG_PATH || resolve(process.cwd(), 'config.json'); const fileContents = await readFile(configPath, 'utf-8'); return JSON.parse(fileContents); } catch (error) {