node express 开启多进程

const express = require('express');
const cluster = require('cluster');
const os = require('os');

function formatDate() {
    let date = new Date();
    const day = date.getDate().toString().padStart(2, '0');
    const month = (date.getMonth() + 1).toString().padStart(2, '0'); // 月份是从0开始的
    const year = date.getFullYear();
    const hours = date.getHours().toString().padStart(2, '0');
    const minutes = date.getMinutes().toString().padStart(2, '0');
    const seconds = date.getSeconds().toString().padStart(2, '0');

    return `${year}-${month}-${day} ${hours}:${minutes}:${seconds}`;
}
const numCPUs = os.cpus().length;
a = undefined
if (cluster.isMaster) {
    // 主进程
    console.log(`master ${process.pid} running`);

    // 为每个CPU核心创建一个工作进程
    for (let i = 0; i < numCPUs; i++) {
        cluster.fork();
    }
    cluster.on('exit', (worker, code, signal) => {
        console.log(`工作进程 ${worker.process.pid} 已退出`);
    });
} else {
    // 工作进程
    const app = express();

    app.get('/encryptPassword', (req, res) => {

        let keyId = req.query.keyId;
        let publicKey = req.query.publicKey;
        let version = req.query.version;
        let password = req.query.password;
        version = isNaN(parseInt(version)) ? 0 : parseInt(version);
        if (keyId && publicKey && version && password) {
            // 调用func 返回结果
            func(keyId, publicKey, version, password).then(result=>{
                console.log(formatDate() +" "+result)
                res.send({status: "ok", password: result})
            }).catch(err=>{
                console.log(formatDate() +" "+err)
                res.send({status: "no", error: err.toString()})
            })
        } else {
            res.send('Error')
        }

    });

    app.listen(8848, () => {
        console.log(`worker ${process.pid} running`);
    });
}