How can I implement custom error handlers in Celery?

How can I implement custom error handlers in Celery?

You can implement custom error handlers in Celery by using the task_failure signal. This allows you to define a function that will be called whenever a task fails.

Can you show me an example of a custom error handler?

Sure! Here's a simple example:

from celery import Celery, signals

app = Celery('tasks')

@signals.task_failure.connect
def task_failure_handler(sender, **kwargs):
    task_id = kwargs['task_id']
    exception = kwargs['exception']
    print(f'Task {task_id} failed with exception: {exception}')

This will print a message whenever a task fails.

What if I want to log the errors instead of printing them?

You can use Python's logging module to log errors. Just replace the print statement with a logging call:

import logging

logging.basicConfig(level=logging.ERROR)

@signals.task_failure.connect
def task_failure_handler(sender, **kwargs):
    task_id = kwargs['task_id']
    exception = kwargs['exception']
    logging.error(f'Task {task_id} failed with exception: {exception}')