Looking at the celery docs i can see that the task monitor is launched in a script (see below). In an implementation of django (as is my understanding), this won't be the case, as (in my understanding) I'll have to launch the task monitor in a thread.
Currently I'm launching the monitor the first time i run a job, then checking its state each subsequent time i run a job (see further below). This seems like a bad way to do this.
What is the correct way to instantiate the task monitor for celery in a django project?
It seems I'm missing something really obvious.
Edit: am i just being basic and we should launch this in a sub process?
# docs example
from celery import Celery
def my_monitor(app):
state = app.events.State()
def announce_failed_tasks(event):
state.event(event)
# task name is sent only with -received event, and state
# will keep track of this for us.
task = state.tasks.get(event['uuid'])
print('TASK FAILED: %s[%s] %s' % (
task.name, task.uuid, task.info(),))
with app.connection() as connection:
recv = app.events.Receiver(connection, handlers={
'task-failed': announce_failed_tasks,
})
recv.capture(limit=None, timeout=None, wakeup=True)
if __name__ == '__main__':
app = Celery(broker='amqp://guest@localhost//')
# LAUNCHED HERE
my_monitor(app)
# my current implementation
# If the celery_monitor is not instantiated, set it up
app = Celery('scheduler',
broker=rabbit_url, # Rabbit-MQ
backend=redis_url, # Redis
include=tasks
)
celery_monitor = Thread(target=build_monitor, args=[app], name='monitor-global', daemon=True)
# import celery_monitor into another module
global celery_monitor
if not celery_monitor.is_alive():
try:
celery_monitor.start()
logger.debug('Celery Monitor - Thread Started (monitor-retry) ')
except RuntimeError as e: # occurs if thread is dead
# create new instance if thread is dead
logger.debug('Celery Monitor - Error restarting thread (monitor-rety): {}'.format(e))
celery_monitor = Thread(target=build_monitor, args=[app], name='monitor-retry', daemon=True)
celery_monitor.start() # start thread
logger.debug('Celery Monitor - Thread Re-Started (monitor-retry) ')
else:
logger.debug('Celery Monitor - Thread is already alive. Dont do anything.')
from Launching celery task_monitor in django
No comments:
Post a Comment