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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 | 6x 6x 6x 6x 6x 6x 6x 6x 6x 6x 26x 26x 26x 2x 2x 24x 18x 18x 6x 6x 6x 26x 26x 26x 8x 8x 6x 6x 18x 18x 18x 18x 18x 18x 4x 4x 4x 4x 4x 4x 18x 8x 8x 8x 5x 3x 3x 3x 1x 1x 18x 3x 3x 3x 3x 3x 3x 1x 1x 18x 19x 19x 19x 19x 19x 19x 18x 6x 1x 1x 6x 1x 1x | import { Server } from "@modelcontextprotocol/sdk/server/index.js";
import { SSEServerTransport } from "@modelcontextprotocol/sdk/server/sse.js";
import { StdioServerTransport } from "@modelcontextprotocol/sdk/server/stdio.js";
import { StreamableHTTPServerTransport } from "@modelcontextprotocol/sdk/server/streamableHttp.js";
import express from "express";
import { HOST, PORT } from "./config";
import { TransportMode } from "./types";
import { packageName, packageVersion } from "./config";
import { setupHandlers } from "./handlers";
import { logger } from "./logger";
// Create server instance
export const server = new Server(
{
name: packageName,
version: packageVersion,
},
{
capabilities: {
tools: {},
},
}
);
// Terminal colors for logging (currently unused)
// const colorGreen = '\x1b[32m';
// const colorReset = '\x1b[0m';
function determineTransportMode(): TransportMode {
const args = process.argv.slice(2);
logger.info(`Transport mode detection: args=${JSON.stringify(args)}, PORT=${PORT}`);
// Check for explicit stdio mode first
if (args.includes("stdio")) {
logger.info("Selected stdio mode (explicit argument)");
return "stdio" as TransportMode;
}
// If PORT environment variable is present, start in dual transport mode (SSE + StreamableHTTP)
if (process.env.PORT) {
logger.info(
"Selected dual transport mode (SSE + StreamableHTTP) - PORT environment variable detected"
);
return "dual" as TransportMode;
}
// Default to stdio mode when no PORT is specified
logger.info("Selected stdio mode (no PORT environment variable)");
return "stdio" as TransportMode;
}
export async function startServer(): Promise<void> {
// Setup request handlers
await setupHandlers(server);
const transportMode = determineTransportMode();
switch (transportMode) {
case "stdio": {
const transport = new StdioServerTransport();
await server.connect(transport);
logger.info("GitLab MCP Server running on stdio");
break;
}
case "sse": {
logger.info("Setting up SSE mode with MCP SDK...");
const app = express();
app.use(express.json());
const sseTransports: { [sessionId: string]: SSEServerTransport } = {};
// SSE endpoint for establishing the stream
app.get("/sse", async (req, res) => {
logger.debug("SSE endpoint hit!");
const transport = new SSEServerTransport("/messages", res);
// Connect the server to this transport (this calls start() automatically)
await server.connect(transport);
// Store transport by session ID for message routing
const sessionId = transport.sessionId;
sseTransports[sessionId] = transport;
logger.debug(`SSE transport created with session: ${sessionId}`);
});
// Messages endpoint for receiving JSON-RPC messages
app.post("/messages", async (req, res) => {
logger.debug("Messages endpoint hit!");
const sessionId = req.query.sessionId as string;
if (!sessionId || !sseTransports[sessionId]) {
return res.status(404).json({ error: "Session not found" });
}
try {
const transport = sseTransports[sessionId];
await transport.handlePostMessage(req, res, req.body);
} catch (error: unknown) {
logger.error({ err: error }, "Error handling SSE message");
res.status(500).json({ error: "Internal server error" });
}
});
app.listen(Number(PORT), HOST, () => {
const url = `http://${HOST}:${PORT}`;
logger.info(`GitLab MCP Server SSE running on ${url}`);
logger.info("SSE server started successfully");
});
break;
}
case "streamable-http": {
const app = express();
app.use(express.json());
const streamableTransports: { [sessionId: string]: StreamableHTTPServerTransport } = {};
// Single endpoint that handles both GET (SSE) and POST (JSON-RPC) requests
// This follows MCP SDK pattern where StreamableHTTP transport handles both internally
app.all("/mcp", async (req, res) => {
const sessionId = req.headers["mcp-session-id"] as string;
try {
let transport: StreamableHTTPServerTransport;
if (sessionId && sessionId in streamableTransports) {
// Use existing transport for this session
transport = streamableTransports[sessionId];
await transport.handleRequest(req, res, req.body);
} else {
// Create new transport (handles both SSE and JSON-RPC internally)
transport = new StreamableHTTPServerTransport({
sessionIdGenerator: () => Math.random().toString(36).substring(7),
onsessioninitialized: (newSessionId: string) => {
streamableTransports[newSessionId] = transport;
logger.info(`MCP session initialized: ${newSessionId} (method: ${req.method})`);
},
onsessionclosed: (closedSessionId: string) => {
delete streamableTransports[closedSessionId];
logger.info(`MCP session closed: ${closedSessionId}`);
},
});
await server.connect(transport);
await transport.handleRequest(req, res, req.body);
}
} catch (error: unknown) {
logger.error({ err: error }, "Error in StreamableHTTP transport");
res.status(500).json({ error: "Internal server error" });
}
});
app.listen(Number(PORT), HOST, () => {
const url = `http://${HOST}:${PORT}`;
logger.info(`GitLab MCP Server running on ${url}/mcp`);
logger.info("Supports both SSE (GET) and JSON-RPC (POST) on same endpoint");
});
break;
}
case "dual": {
logger.info("Setting up dual transport mode (SSE + StreamableHTTP)...");
const app = express();
app.use(express.json());
// Transport storage for both SSE and StreamableHTTP
const sseTransports: { [sessionId: string]: SSEServerTransport } = {};
const streamableTransports: { [sessionId: string]: StreamableHTTPServerTransport } = {};
// SSE Transport Endpoints (backwards compatibility)
app.get("/sse", async (req, res) => {
logger.debug("SSE endpoint hit!");
const transport = new SSEServerTransport("/messages", res);
await server.connect(transport);
const sessionId = transport.sessionId;
sseTransports[sessionId] = transport;
logger.debug(`SSE transport created with session: ${sessionId}`);
});
app.post("/messages", async (req, res) => {
logger.debug("SSE messages endpoint hit!");
const sessionId = req.query.sessionId as string;
if (!sessionId || !sseTransports[sessionId]) {
return res.status(404).json({ error: "Session not found" });
}
try {
const transport = sseTransports[sessionId];
await transport.handlePostMessage(req, res, req.body);
} catch (error: unknown) {
logger.error({ err: error }, "Error handling SSE message");
res.status(500).json({ error: "Internal server error" });
}
});
// StreamableHTTP Transport Endpoint (modern, supports both GET SSE and POST JSON-RPC)
app.all("/mcp", async (req, res) => {
const sessionId = req.headers["mcp-session-id"] as string;
try {
let transport: StreamableHTTPServerTransport;
Iif (sessionId && sessionId in streamableTransports) {
transport = streamableTransports[sessionId];
await transport.handleRequest(req, res, req.body);
} else {
transport = new StreamableHTTPServerTransport({
sessionIdGenerator: () => Math.random().toString(36).substring(7),
onsessioninitialized: (newSessionId: string) => {
streamableTransports[newSessionId] = transport;
logger.info(`MCP session initialized: ${newSessionId} (method: ${req.method})`);
},
onsessionclosed: (closedSessionId: string) => {
delete streamableTransports[closedSessionId];
logger.info(`MCP session closed: ${closedSessionId}`);
},
});
await server.connect(transport);
await transport.handleRequest(req, res, req.body);
}
} catch (error: unknown) {
logger.error({ err: error }, "Error in StreamableHTTP transport");
res.status(500).json({ error: "Internal server error" });
}
});
app.listen(Number(PORT), HOST, () => {
const url = `http://${HOST}:${PORT}`;
logger.info(`GitLab MCP Server running on ${url}`);
logger.info("🔄 Dual Transport Mode Active:");
logger.info(` 📡 SSE endpoint: ${url}/sse (backwards compatibility)`);
logger.info(` 🚀 StreamableHTTP endpoint: ${url}/mcp (modern, supports SSE + JSON-RPC)`);
logger.info("Clients can use either transport as needed");
});
break;
}
}
}
// Graceful shutdown
process.on("SIGINT", () => {
logger.info("Shutting down GitLab MCP Server...");
process.exit(0);
});
process.on("SIGTERM", () => {
logger.info("Shutting down GitLab MCP Server...");
process.exit(0);
});
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