Fork with async await in nodejs not working

Question

I have tried to forking in node. For simple calculation it seems to work fine. But when I use for loop, I don't get any result. I have tried using promise also but all I get is promise pending. Below are the code used.

In moduleProgress.js:

const getModules = async (studentArray) => {
  let progress = [];
  for (const student of studentArray) {
    console.log(student); //prints the first student id an then nothing happens
    let std = await User.findById(student); //stops here
    console.log(std); //nothing
    std = {
      username: std.username,
      firstname: std.firstname,
      lastname: std.lastname,
      batch: std.batch,
    };
    progress.push(std);
  }
  return progress;
};

process.on("message", async (params) => {
  const progress = await getModules(params.students);
  process.send(progress);
});

In another file:

if (students.length > 0) {
        const calculation = fork("helpers/moduleProgress.js");
        calculation.send({
          students: students,
        });
        calculation.on("message", (response) => {
          allStatus = response;
          console.log(response)
        });
        res.json({
          success: true,
          allProgress: allStatus,
        });

I think you should consider using fork. https://stackoverflow.com/questions/17861362/node-js-child-process-difference-between-spawn-fork — Srinath Kamath, Dec 02 '20 at 06:20
@SrinathNilatech I have used fork. Or am I doing something wrong ? — manjish, Dec 02 '20 at 06:27
Are you trying to run a child process or do you just want to run a function from another file at helpers/moduleProgress.js? — Srinath Kamath, Dec 02 '20 at 06:32
May I know where the fork is invoked because you have only shared a separate code. It'll be great if you could share the code on github or stackblitz — Srinath Kamath, Dec 02 '20 at 06:47
@SrinathNilatech The fork is invoked in another file above. The const calculation part. — manjish, Dec 02 '20 at 06:49
Okay, can you share the code? It'll be easier to debug that way — Srinath Kamath, Dec 02 '20 at 06:53

score 1 · Accepted Answer · answered Dec 06 '20 at 07:21

1

Solved it. Called the instance of mongoose in the moduleProgress.js (child) and it worked as a charm.

answered Dec 06 '20 at 07:21

manjish

90
8

Fork with async await in nodejs not working

1 Answers1