SnowLuma/.pnpm-store/v11/files/85/8091c27b79eeba3ca679540e23eaa4353af2610928220129421c973d85d5c711381275ee96bc6d9b16caa16c40a80f979aa15992bc584d834f76dab3f1f1e6

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
const node_crypto_1 = require("node:crypto");
const mcp_js_1 = require("../../server/mcp.js");
const streamableHttp_js_1 = require("../../server/streamableHttp.js");
const types_js_1 = require("../../types.js");
const express_js_1 = require("../../server/express.js");
// Factory to create a new MCP server per session.
// Each session needs its own server+transport pair to avoid cross-session contamination.
const getServer = () => {
    const server = new mcp_js_1.McpServer({
        name: 'resource-list-changed-notification-server',
        version: '1.0.0'
    });
    const addResource = (name, content) => {
        const uri = `https://mcp-example.com/dynamic/${encodeURIComponent(name)}`;
        server.registerResource(name, uri, { mimeType: 'text/plain', description: `Dynamic resource: ${name}` }, async () => {
            return {
                contents: [{ uri, text: content }]
            };
        });
    };
    addResource('example-resource', 'Initial content for example-resource');
    // Periodically add new resources to demonstrate notifications
    const resourceChangeInterval = setInterval(() => {
        const name = (0, node_crypto_1.randomUUID)();
        addResource(name, `Content for ${name}`);
    }, 5000);
    // Clean up the interval when the server closes
    server.server.onclose = () => {
        clearInterval(resourceChangeInterval);
    };
    return server;
};
// Close sessions that have been idle for IDLE_MS, and keep at most MAX_SESSIONS open
const IDLE_MS = 30 * 60000;
const MAX_SESSIONS = 1000;
const sessions = new Map();
// Count open responses so a long-running request or a listening SSE stream is not treated as idle
const trackResponse = (session, res) => {
    if (!res.socket || res.destroyed)
        return;
    session.open++;
    res.on('close', () => {
        session.open--;
        session.lastActive = Date.now();
    });
};
// Close sessions with nothing open and no activity for IDLE_MS
setInterval(() => {
    const cutoff = Date.now() - IDLE_MS;
    for (const { transport, open, lastActive } of sessions.values()) {
        if (open === 0 && lastActive < cutoff)
            transport.close().catch(console.error);
    }
}, 60000).unref();
const app = (0, express_js_1.createMcpExpressApp)();
app.post('/mcp', async (req, res) => {
    console.log('Received MCP request:', req.body);
    try {
        // Check for existing session ID
        const sessionId = req.headers['mcp-session-id'];
        const session = sessionId ? sessions.get(sessionId) : undefined;
        let transport;
        if (session) {
            // Reuse existing transport
            transport = session.transport;
            trackResponse(session, res);
        }
        else if (!sessionId && (0, types_js_1.isInitializeRequest)(req.body)) {
            // New initialization request
            if (sessions.size >= MAX_SESSIONS) {
                res.status(503).json({ jsonrpc: '2.0', error: { code: -32000, message: 'Too many open sessions' }, id: null });
                return;
            }
            transport = new streamableHttp_js_1.StreamableHTTPServerTransport({
                sessionIdGenerator: () => (0, node_crypto_1.randomUUID)(),
                onsessioninitialized: sessionId => {
                    // Store the transport by session ID when session is initialized
                    // This avoids race conditions where requests might come in before the session is stored
                    console.log(`Session initialized with ID: ${sessionId}`);
                    sessions.set(sessionId, { transport, open: 0, lastActive: Date.now() });
                }
            });
            // Set up onclose handler to clean up transport when closed
            transport.onclose = () => {
                const sid = transport.sessionId;
                if (sid && sessions.has(sid)) {
                    console.log(`Transport closed for session ${sid}, removing from sessions map`);
                    sessions.delete(sid);
                }
            };
            // Create a new server per session and connect it to the transport
            const server = getServer();
            await server.connect(transport);
            // Handle the request - the onsessioninitialized callback will store the transport
            await transport.handleRequest(req, res, req.body);
            // If the transport rejected the request no session was created, so close it to stop the server's interval
            if (!transport.sessionId)
                await transport.close();
            return; // Already handled
        }
        else if (sessionId) {
            // Unknown or expired session ID - the client should start a new session
            res.status(404).json({ jsonrpc: '2.0', error: { code: -32001, message: 'Session not found' }, id: null });
            return;
        }
        else {
            // Invalid request - no session ID and not an initialization request
            res.status(400).json({
                jsonrpc: '2.0',
                error: {
                    code: -32000,
                    message: 'Bad Request: No valid session ID provided'
                },
                id: null
            });
            return;
        }
        // Handle the request with existing transport
        await transport.handleRequest(req, res, req.body);
    }
    catch (error) {
        console.error('Error handling MCP request:', error);
        if (!res.headersSent) {
            res.status(500).json({
                jsonrpc: '2.0',
                error: {
                    code: -32603,
                    message: 'Internal server error'
                },
                id: null
            });
        }
    }
});
// Handle GET requests for SSE streams (now using built-in support from StreamableHTTP)
app.get('/mcp', async (req, res) => {
    const sessionId = req.headers['mcp-session-id'];
    if (!sessionId) {
        res.status(400).send('Missing session ID');
        return;
    }
    const session = sessions.get(sessionId);
    if (!session) {
        // Unknown or expired session ID - the client should start a new session
        res.status(404).json({ jsonrpc: '2.0', error: { code: -32001, message: 'Session not found' }, id: null });
        return;
    }
    console.log(`Establishing SSE stream for session ${sessionId}`);
    trackResponse(session, res);
    await session.transport.handleRequest(req, res);
});
// Start the server
const PORT = 3000;
app.listen(PORT, error => {
    if (error) {
        console.error('Failed to start server:', error);
        process.exit(1);
    }
    console.log(`Server listening on port ${PORT}`);
});
// Handle server shutdown
process.on('SIGINT', async () => {
    console.log('Shutting down server...');
    for (const [sessionId, { transport }] of sessions) {
        await transport.close();
        sessions.delete(sessionId);
    }
    process.exit(0);
});
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