backend-and-orchestration-toolkit/code/protocol_demos/short-polling/index.js

const app = require("express")();
const jobs = {}

app.post("/submit", (req, res) =>  {
    const jobId = `job:${Date.now()}`
    jobs[jobId] = 0;
    updateJob(jobId,0); 
    res.end("\n\n" + jobId + "\n\n");
})

app.get("/checkstatus", (req, res) => {
    console.log(jobs[req.query.jobId])
    res.end("\n\nJobStatus: " + jobs[req.query.jobId] + "%\n\n")

} )

app.listen(8080, () => console.log("listening on 8080"));

function updateJob(jobId, prg) {
    jobs[jobId] = prg;
    console.log(`updated ${jobId} to ${prg}`)
    if (prg == 100) return;
    this.setTimeout(()=> updateJob(jobId, prg + 10), 3000)
}