Support processor with observables

[vahidvdn]

Is there an existing issue that is already proposing this?

• I have searched the existing issues

Is your feature request related to a problem? Please describe it

I have an observable in my processor, as following:

@Processor(BULLMQ_QUEUE_NAME)
export class JobProcessor extends WorkerHost {
  async process(job: Job<Record<string, any>>): Promise<any> {
    this.client
      .send('testFailure', 5)
      .pipe(timeout(5000))
      .subscribe({
        next: (data) => console.log('successful job', data),
        error: (err) => console.log('failed job'), // can not fail the job
      });
  }
}

With promises, I can easily await a function, and based on my condition I can throw an error as the following and mark the job as failed:

throw new Error('job failed');

But with observables, I can't do this. If I put the throw inside the error section of observable, it doesn't work, because actually before that, the job is considered completed.

Note: I prefer not to use toPromise since it's deprecated.

Describe the solution you'd like

Any possible way to accomplish this issue

Teachability, documentation, adoption, migration strategy

No response

What is the motivation / use case for changing the behavior?

Ability to use microservice client and in case of an issue with connection while sending the message, we could mark the job as failed.

[kamilmysliwiec]

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