Hono + Bun graceful shutdown, handling SIGTERM

[amikofalvy]

I'm trying to figure out the best way to safely shutdown a running instance of Hono without dropping requests that are currently processing.

I'm running hono+bun within a container on GCP Cloud Run. When there is a scale in event Google sends the SIGTERM event to the process.

In Node Express I would do something like the following, how would I implement something similar with Hono + Bun?

const express = require('express');

const app = express();
const PORT = process.env.PORT || 3000;

// Basic route
app.get('/', (req, res) => {
    res.send('Server is running!');
});

// Start the server
const server = app.listen(PORT, () => {
    console.log(`Server is listening on port ${PORT}`);
});

// Graceful shutdown handler
function gracefulShutdown(signal) {
    console.log(`Received signal: ${signal}`);
    console.log('Closing server gracefully...');
    
    server.close(() => {
        console.log('HTTP server closed.');
        process.exit(0); // Exit process when server closes
    });

    // Fallback for pending connections
    setTimeout(() => {
        console.error('Forcing shutdown due to pending connections.');
        process.exit(1); // Exit with error if still not closed
    }, 10000); // Adjust timeout as needed
}

// Handle termination signals
['SIGINT', 'SIGTERM'].forEach(signal => {
    process.on(signal, () => gracefulShutdown(signal));
});