Hey, I'm using TypeORM. How i can use "await" inside .exec() fun

Here is the problem i have with the same code: <div class="highlight highlight-sou

The function getUsers references external code <code

How to use TypeORM or Prisma inside worker ? about workerpool HOT 7 CLOSED

ghostlexly commented on July 18, 2024

How to use TypeORM or Prisma inside worker ?

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josdejong commented on July 18, 2024

If this is a question about TypeORM please ask at the project itself. You can ask questions here about workerpool.

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ghostlexly commented on July 18, 2024

It's about workerpool, i want to find a way to use Async methods inside workerpool, like typeorm's async methods, it's just an example

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josdejong commented on July 18, 2024

You can "just" use async functions and return Promise like results.

Here is an example: https://jsbin.com/semafew/edit?html,console

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ghostlexly commented on July 18, 2024

Here is the problem i have with the same code:

import workerpool from "workerpool";
import { User } from "./entities/User";
export const queues = workerpool.pool({
  maxWorkers: require("os").cpus().length,
});

  async function getUsers() {
    function getResults() {
      return new Promise(async (resolve, reject) => {
        resolve(await User.find());
      });
    }

    return await getResults();
  }

  const test = await queues.exec(getUsers, []);

User is the entity from TypeORM.

crosslikes-backend-1  | ReferenceError: User_1 is not defined
crosslikes-backend-1  |     at eval (eval at run (/usr/src/app/node_modules/workerpool/src/worker.js:105:11), <anonymous>:6:25)
crosslikes-backend-1  |     at new Promise (<anonymous>)
crosslikes-backend-1  |     at getResults (eval at run (/usr/src/app/node_modules/workerpool/src/worker.js:105:11), <anonymous>:5:20)
crosslikes-backend-1  |     at getUsers (eval at run (/usr/src/app/node_modules/workerpool/src/worker.js:105:11), <anonymous>:9:22)
crosslikes-backend-1  |     at Function.eval (eval at run (/usr/src/app/node_modules/workerpool/src/worker.js:105:11), <anonymous>:10:8)
crosslikes-backend-1  |     at Function.run (/usr/src/app/node_modules/workerpool/src/worker.js:106:12)
crosslikes-backend-1  |     at MessagePort.<anonymous> (/usr/src/app/node_modules/workerpool/src/worker.js:157:27)
crosslikes-backend-1  |     at [nodejs.internal.kHybridDispatch] (node:internal/event_target:737:20)
crosslikes-backend-1  |     at exports.emitMessage (node:internal/per_context/messageport:23:28)

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josdejong commented on July 18, 2024

The function getUsers references external code User. The function is serialized, send to the worker, and then deserialized, and therefore must be completely standalone. In this case, on the worker side there is no User. You'll have to either embed this class in the function, or create a dedicated worker.

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ghostlexly commented on July 18, 2024

Is there a way to call the dedicated worker with a class name ?
i try to avoid file paths like this

__dirname + '/myWorker.js'

Thanks for the solutions

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josdejong commented on July 18, 2024

No, just like a regular import you need to point to the path where the worker script can be found.

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How to use TypeORM or Prisma inside worker ? about workerpool HOT 7 CLOSED

Comments (7)

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