Node.js 当进程被杀死时，如何优雅地关闭我的 Express 服务器

我为服务器上打开的连接添加了一个侦听器，将对这些连接的引用存储在一个数组中.当连接关闭时，它们将从数组中删除.

当服务器被终止时，每个连接都会通过调用其end个方法来关闭.对于某些浏览器(例如Chrome)，这是不够的，因此在超时后，我会在每个连接上调用destroy.

const express = require('express');

const app = express();

app.get('/', (req, res) => res.json({ ping: true }));

const server = app.listen(3000, () => console.log('Running…'));

setInterval(() => server.getConnections(
    (err, connections) => console.log(`${connections} connections currently open`)
), 1000);

process.on('SIGTERM', shutDown);
process.on('SIGINT', shutDown);

let connections = [];

server.on('connection', connection => {
    connections.push(connection);
    connection.on('close', () => connections = connections.filter(curr => curr !== connection));
});

function shutDown() {
    console.log('Received kill signal, shutting down gracefully');
    server.close(() => {
        console.log('Closed out remaining connections');
        process.exit(0);
    });

    setTimeout(() => {
        console.error('Could not close connections in time, forcefully shutting down');
        process.exit(1);
    }, 10000);

    connections.forEach(curr => curr.end());
    setTimeout(() => connections.forEach(curr => curr.destroy()), 5000);
}