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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
app = Celery('tasks')
# Use Redis as our broker and define json as the default serializer
app.conf.update(
BROKER_URL=REDIS_URL,
CELERY_TASK_SERIALIZER='json',
CELERY_ACCEPT_CONTENT=['json', 'msgpack', 'yaml']
)
# 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))
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