Hono and node.js cluster...yes, it's possible!

[stefanos82]

Seems like it's possible to use Hono with Node.js cluster module!

Here's the actual sample code:

import cluster from 'node:cluster';
import { serve } from '@hono/node-server';
import { Hono } from 'hono';

const numCPUs = navigator.hardwareConcurrency;
const port = 3000;

const app = new Hono();

app.get('/', (c) => {
  return c.text('Hello Hono!')
});

if (cluster.isPrimary) {
    console.log(`Primary ${process.pid} is running`);

    for (let i = 0; i < numCPUs; i++) {
        cluster.fork();
    }

    cluster.on('SIGINT', (worker, code, signal) => {
        console.log(`worker ${worker.process.pid} with code ${code} died (${signal})`);
    });

    cluster.on('exit', (worker, code, signal) => {
        console.log(`worker ${worker.process.pid} with code ${code} died (${signal})`);
    });
} else {
    serve({
        fetch: app.fetch,
        port: port
    }, (info) => {
        console.log(`Server is running on http://localhost:${info.port}`)
    });
}

Just remember to configure your package.json to run this instead of the standard TypeScript index file or whatever the name your gave it and should work just fine; I personally wrote it as "cluster": "tsx watch src/cluster.ts".