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'd like to further expand on Pierre's answer as I've encountered some issues using the suggested solution.

To allow custom fields when updating a task's state to states.FAILURE, it is important to also mock some attributes that a FAILURE state would have (notice exc_type and exc_message) While the solution will terminate the task, any attempt to query the state (For example - to fetch the 'REASON FOR FAILURE' value) will fail.

Below is a snippet for reference I took from: https://www.distributedpython.com/2018/09/28/celery-task-states/

@app.task(bind=True)
def task(self):
    try:
        raise ValueError('Some error')
    except Exception as ex:
        self.update_state(
            state=states.FAILURE,
            meta={
                'exc_type': type(ex).__name__,
                'exc_message': traceback.format_exc().split('\n')
                'custom': '...'
            })
        raise Ignore()