Conqueue

Conqueue is a queue manager library built on the top of redis. You can create jobs in queues, and process later with worker scripts asynchronously.

Installation

git clone git://github.com/emre/conqueue.git
sudo python setup.py install

In order to use conqueue, you need to install redis-py library (sudo pip install redis), and a working redis-server instance.

Conqueue works with Configuration objects. There are some options you can choose for conqueue's workflow.

A simple worker script that listens 'feeds' queue.

from conqueue.conqueue import Conqueue
from conqueue.lib.config import BaseConfig

class Configuration(BaseConfig):
   REDIS_SERVER_INFO = {
      'host'     : 'localhost',
      'port'     : 6379,
      'db'       : 0,
   }

   USE_MULTI_PROCESSING = True
   POOLSIZE_PER_WORKER  = 5

def parse_feed(data):
    import time
    # make something with the feed
    time.sleep(2)
    print data

# listens two queues: ['feeds', 'messages']
worker = Conqueue(Configuration).worker()
worker.register_task('feeds', parse_feed)

worker.listen_tasks()

Client script that puts jobs to the worker:

from conqueue.conqueue import Conqueue

client  = Conqueue(Configuration).client()
client.add_task('messages', 'how you doing?')

Configuration Options

USE_MULTI_PROCESSING

default: True

If set True, conqueue forks worker function based on cpu count by default.

POOLSIZE_PER_WORKER

default: None

If you don't set this explicitly, conqueue forks workers based on CPU count. (which is recommended.)

PREFIX = 'conqueue'

default: conqueue

Prefix for the redis keys.

RETRY_BEHAVIOUR

default: (True, 100)

if worker functions raises any exception, conqueue catches it, and requeue if you want. First argument is for enabling/disabling. second argument is for retry count.

Task Priority

There is no support for this. But you can do it manually by creating more instances for your workers. If you use register_task more than one in one worker, first registered queue will have high priority.

Basic Admin Script

there is a simple and stupid script for queue monitoring in the /tools directory. A frontend with more meaningful information will be added in the future.

emre@amy:~/github_projects/conqueue/tools$ python conqueue-admin.py
conqueue:feeds 15
conqueue:feeds:failed 1
conqueue:messages 5

Todo

• Management/Monitoring Frontend
• Optional gevent based pool instead of multiprocessing library.
• Redis sharding in the back. (with consistent hashing: http://emreyilmaz.me/implementing-consistent-hashing-into-your-redis)

Notes

Remember that, conqueue is not tested well. It is a weekend hackathon project, and still in early development.