server/serverFactory.ts

import { createServer } from 'node:http';
import { Socket } from 'node:net';
import {
    type FastifyServerFactory,
    FastifyServerFactoryHandler,
    RawServerDefault,
} from 'npm:fastify';
import wisp from 'npm:wisp-server-node';
import { parsedDoc } from './config/config.ts';

const serverFactory: FastifyServerFactory = (
    handler: FastifyServerFactoryHandler,
): RawServerDefault => {
    return createServer()
        .on('request', (req, res) => {
            handler(req, res);
        })
        .on('upgrade', (req, socket, head) => {
            if (req.url?.endsWith('/wisp/') && parsedDoc.server.wisp === true) {
                wisp.routeRequest(req, socket as Socket, head);
            }
        });
};

export { serverFactory };