# Execution runners based on Celery

Celery is a feature rich task queue implemented in Python and provides easy
means to scale and distribute workloads across also large numbers of workers.

## Requirements

    pip3 install celery
    dnf install rabbitmq-server

## How to Run


    # 1) make sure rabbitmq or other "message broker" is running
    service rabbitmq-server start

    # 2) startup a celery worker
    celery worker --loglevel=info
    
    cd ..
    celery -A runner worker --loglevel=info

   
    # if CELERY_IMPORTS is not set in celeryconfig.py, tasks to import need to be specified
    celery -A runner.tasks worker --loglevel=info







## Testing the worker

Manual testing a dummy task (e.g. adding two numbers):

    # in terminal
    python3

    # in python3 console
    from runner.tasks_debug import add
    add.delay(4,7) # out: <AsyncResult: e76d2895-e38e-47e1-985e-71e507384548>

    r = add.delay(2,3)
    r.status # out: 'SUCCESS'
    r.result # out: 5

## Resources and References


Getting Started
http://docs.celeryproject.org/en/latest/getting-started/first-steps-with-celery.html

Celery running workers as daemon
http://docs.celeryproject.org/en/latest/tutorials/daemonizing.html#daemonizing