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Copyright 2024 Aaron Heise
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the “Software”), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED “AS IS”, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

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# MCP Gateway
A flexible gateway server that bridges Model Context Protocol (MCP) STDIO servers to HTTP+SSE, enabling multi-instance MCP servers to be exposed over HTTP.
## Features
- Run multiple instances of the same MCP server type
- Configure multiple different MCP server types
- Flexible network binding configuration
- Clean separation between server instances using session IDs
- Automatic cleanup of server resources on connection close
- YAML-based configuration
## Installation
```bash
npm install
```
## Configuration
The gateway is configured using a YAML file. By default, it looks for `config.yaml` in the current directory, but you can specify a different path using the `CONFIG_PATH` environment variable.
### Basic Configuration Example
```yaml
hostname: "0.0.0.0" # Listen on all interfaces
port: 3000
servers:
filesystem:
command: npx
args:
- -y
- "@modelcontextprotocol/server-filesystem"
- "/path/to/root"
git:
command: npx
args:
- -y
- "@modelcontextprotocol/server-git"
```
### Network Configuration Examples
#### Listen on localhost only (development)
```yaml
hostname: "127.0.0.1"
port: 3000
```
#### Listen on a specific interface
```yaml
hostname: "192.168.1.100"
port: 3000
```
#### Listen on all interfaces (default)
```yaml
hostname: "0.0.0.0"
port: 3000
```
### Server Configuration
Each server in the `servers` section needs:
- `command`: The command to run the server
- `args`: List of arguments for the command
- `path` (optional): Working directory for the server
Example with all options:
```yaml
servers:
myserver:
command: npx
args:
- -y
- "@modelcontextprotocol/server-mytype"
- "--some-option"
```
## Running the Gateway
Standard start:
```bash
npm start
```
With custom config:
```bash
CONFIG_PATH=/path/to/my/config.yaml npm start
```
## Adding New Server Types
1. Install the MCP server package you want to use
2. Add a new entry to the `servers` section in your config:
```yaml
servers:
mynewserver:
command: npx
args:
- -y
- "@modelcontextprotocol/server-newtype"
# Add any server-specific arguments here
```
## Architecture
The gateway creates a unique session for each server instance, allowing multiple clients to use the same server type independently. Each session maintains its own:
- STDIO connection to the actual MCP server
- SSE connection to the client
- Message bridging between the transports
When a client disconnects, all associated resources are automatically cleaned up.
## Environment Variables
- `CONFIG_PATH`: Path to the YAML configuration file (default: `./config.yaml`)
## Contributing
Feel free to submit issues and pull requests!
## License
MIT License

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hostname: "0.0.0.0" # Listen on all interfaces by default
port: 3000
servers:
filesystem:
command: npx
args:
- -y
- "@modelcontextprotocol/server-filesystem"
- "/home/aaron"
git:
command: npx
args:
- -y
- "@modelcontextprotocol/server-git"
puppeteer:
command: npx
args:
- -y
- "@modelcontextprotocol/server-puppeteer"

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22
package.json Normal file
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@@ -0,0 +1,22 @@
{
"name": "mcp-gateway",
"version": "1.0.0",
"type": "module",
"scripts": {
"start": "tsx src/gateway.ts"
},
"keywords": [],
"author": "",
"license": "ISC",
"description": "",
"dependencies": {
"@modelcontextprotocol/sdk": "latest",
"@types/node": "^22.10.2",
"ts-node": "^10.9.1",
"typescript": "^5.0.0",
"yaml": "^2.6.1"
},
"devDependencies": {
"tsx": "^4.19.2"
}
}

159
src/gateway.ts Normal file
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@@ -0,0 +1,159 @@
import { SSEServerTransport } from "@modelcontextprotocol/sdk/server/sse.js";
import { StdioClientTransport } from "@modelcontextprotocol/sdk/client/stdio.js";
import { parse } from 'yaml';
import { readFileSync } from 'fs';
import http from "http";
interface ServerConfig {
command: string;
args: string[];
path?: string;
}
interface GatewayConfig {
hostname: string;
port: number;
servers: Record<string, ServerConfig>;
}
class MCPServer {
constructor(
public stdioTransport: StdioClientTransport,
public sseTransport: SSEServerTransport
) {}
}
class MCPGateway {
private servers: Map<string, MCPServer> = new Map();
constructor(private config: GatewayConfig) { }
async start() {
const httpServer = http.createServer(async (req, res) => {
const serverName = req.url?.split('/')[1].split('?')[0] || "";
console.debug({
fullUrl: req.url,
method: req.method,
serverName,
isConfigured: serverName ? !!this.config.servers[serverName] : false,
configuredServers: Object.keys(this.config.servers)
});
if (!serverName || !this.config.servers[serverName] || !req.url) {
console.log('404: Server not found or invalid URL path');
res.writeHead(404).end();
return;
}
// Handle root server path - establish SSE connection
if (req.method === "GET") {
console.log(`New SSE connection for ${serverName}`);
try {
const serverConfig = this.config.servers[serverName];
const stdioTransport = new StdioClientTransport({
command: serverConfig.command,
args: serverConfig.args,
env: process.env as Record<string, string>,
});
// Create SSE transport with just the path portion
const sseTransport = new SSEServerTransport(`/${serverName}`, res);
const server = new MCPServer(stdioTransport, sseTransport);
const sessionId = req.url + "?sessionId=" + sseTransport.sessionId;
// Store server info
this.servers.set(sessionId, server);
// Bridge messages from STDIO to SSE
server.stdioTransport.onmessage = (msg) => {
sseTransport.send(msg);
};
res.on('close', () => {
console.log(`SSE connection closed for ${sessionId}`);
server.sseTransport.close();
server.stdioTransport.close();
this.servers.delete(sessionId);
});
console.log(`Starting transports for ${sessionId}`);
await server.stdioTransport.start();
await server.sseTransport.start();
} catch (error) {
console.error('Error setting up SSE connection:', error);
res.writeHead(500).end(String(error));
}
return;
}
// Handle message endpoint
if (req.method === "POST") {
const sessionId = req.url!;
const server = this.servers.get(sessionId);
if (!server?.sseTransport) {
res.writeHead(400).end("No active transport for session " + sessionId);
return;
}
// Read the POST body
let body = '';
req.on('data', chunk => {
body += chunk.toString();
});
req.on('end', async () => {
try {
// Parse and forward message to STDIO server
const message = JSON.parse(body);
await server.stdioTransport.send(message);
// Send success response
res.writeHead(202).end();
} catch (error) {
console.error('Error handling message:', error);
res.writeHead(500).end(String(error));
}
});
return;
}
res.writeHead(404).end();
});
httpServer.listen(this.config.port, this.config.hostname);
console.log(`MCP Gateway listening on ${this.config.hostname}:${this.config.port}`);
}
}
// Load config from YAML file
const configPath = process.env.CONFIG_PATH || './config.yaml';
console.log(`Loading configuration from ${configPath}`);
try {
const configFile = readFileSync(configPath, 'utf8');
const config = parse(configFile) as GatewayConfig;
// Validate required config fields
if (!config.hostname) {
config.hostname = '0.0.0.0'; // Default to all interfaces if not specified
console.log('No hostname specified, defaulting to 0.0.0.0');
}
if (!config.port) {
throw new Error('Port must be specified in config');
}
if (!config.servers || Object.keys(config.servers).length === 0) {
throw new Error('At least one server must be configured');
}
// Start gateway with loaded config
const gateway = new MCPGateway(config);
gateway.start().catch(error => {
console.error('Failed to start gateway:', error);
process.exit(1);
});
} catch (error) {
console.error('Failed to load configuration:', error);
process.exit(1);
}

15
tsconfig.json Normal file
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@@ -0,0 +1,15 @@
{
"compilerOptions": {
"target": "ES2020",
"module": "ESNext",
"moduleResolution": "Node",
"strict": true,
"esModuleInterop": true,
"skipLibCheck": true,
"forceConsistentCasingInFileNames": true,
"outDir": "./dist",
"rootDir": "./src"
},
"include": ["src/**/*"],
"exclude": ["node_modules"]
}