Based on MattH’s answer, you could use a decorator like this:
def single_instance_task(timeout):
def task_exc(func):
@functools.wraps(func)
def wrapper(*args, **kwargs):
lock_id = "celery-single-instance-" + func.__name__
acquire_lock = lambda: cache.add(lock_id, "true", timeout)
release_lock = lambda: cache.delete(lock_id)
if acquire_lock():
try:
func(*args, **kwargs)
finally:
release_lock()
return wrapper
return task_exc
then, use it like so…
@periodic_task(run_every=timedelta(minutes=1))
@single_instance_task(60*10)
def fetch_articles()
yada yada...