@vreippainen/hevy-mcp-server/dist/server/httpTransport.js

A MCP server for Hevy

import express from 'express';
import { config } from '../config.js';
export class HttpServerTransport {
    app = express();
    server = null;
    sseClients = new Set();
    constructor() {
        this.app.use(express.json());
        // SSE endpoint
        this.app.get('/events', (req, res) => {
            res.writeHead(200, {
                'Content-Type': 'text/event-stream',
                'Cache-Control': 'no-cache',
                Connection: 'keep-alive',
            });
            // Send initial connection message
            res.write('data: {"type": "connected"}\n\n');
            // Add client to the set
            this.sseClients.add(res);
            // Remove client when connection closes
            req.on('close', () => {
                this.sseClients.delete(res);
            });
        });
    }
    async start() {
        return new Promise((resolve) => {
            this.server = this.app.listen(config.server.port, () => {
                console.error(`HTTP server running on port ${config.server.port}`);
                resolve();
            });
        });
    }
    async close() {
        if (this.server) {
            await new Promise((resolve, reject) => {
                this.server?.close((err) => {
                    if (err)
                        reject(err);
                    else
                        resolve();
                });
            });
        }
    }
    async send(message) {
        // Send message to all connected SSE clients
        this.sseClients.forEach((client) => {
            client.write(`data: ${JSON.stringify(message)}\n\n`);
        });
    }
    async receive() {
        // HTTP transport doesn't receive messages directly
        return new Promise(() => { });
    }
}
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