tasks.py


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import logging

from celery import Celery
from celery.task import periodic_task
from datetime import timedelta
from os import environ

# Fetch the Redis connection string from the env, or use localhost by default
REDIS_URL = environ.get('REDISTOGO_URL', 'redis://localhost')

# Setup the celery instance under the 'tasks' namespace
celery = Celery('tasks', broker=REDIS_URL)

# Define the fibonacci function for use in our task
def fib(n):
    if n > 1:
        return fib(n - 1) + fib(n - 2)
    else:
        return 1

# The periodic task itself, defined by the following decorator
@periodic_task(run_every=timedelta(seconds=10))
def print_fib():
    # Just log fibonacci(30), no more
    logging.info(fib(30))