filen-s3-app.js

const express = require("express");
const app = express();
const port = 3000;
var exec = require("child_process").exec;
const { createProxyMiddleware } = require("http-proxy-middleware");
const path = require('path');
const fs = require('fs');

const currentDir = __dirname;
process.chdir(currentDir);

app.use('/', createProxyMiddleware({
  target: 'http://127.0.0.1:PORT', 
  changeOrigin: true,  
  ws: true,
  onError: (err, req, res) => {
    res.writeHead(500, {
      'Content-Type': 'text/plain',
    });
    res.end('Please wait for a while and try to refresh the page.');
  },
}));

function keep_web_alive() {
    exec("pgrep -laf server.js", function (err, stdout, stderr) { 
      if (stdout.includes("server.js")) {  
        console.log("web 正在运行");
      } else {
        exec(
          "node server.js", 
          function (err, stdout, stderr) {
            if (err) {
              console.log("保活-调起web-命令行执行错误:" + err);
            } else {
              console.log("保活-调起web-命令行执行成功!");
            }
          }
        );
      }
    });
  }
  setInterval(keep_web_alive, 10 * 1000);

app.listen(port, () => console.log(`Example app listening on port ${port}!`));