How to make a celery task fail from within the task?

Question

Under some conditions, I want to make a celery task fail from within that task. I tried the following:

from celery.task import task
from celery import states

@t         


        

Answer 1

I got an interesting reply on this question from Ask Solem, where he proposes an 'after_return' handler to solve the issue. This might be an interesting option for the future.

In the meantime I solved the issue by simply returning a string 'FAILURE' from the task when I want to make it fail and then checking for that as follows:

result = AsyncResult(task_id)
if result.state == 'FAILURE' or (result.state == 'SUCCESS' and result.get() == 'FAILURE'):
    # Failure processing task