qw

qw (or QueueWorker) is used to run worker processes which listen on a redis list for jobs to process.

Setup

pip

pip install qw

git

git clone git://github.com/brettlangdon/qw.git
cd ./qw
python setup.py install

Design

Manager

The manager is simply a process manager. It's job is to start/stop worker sub-processes.

Worker

The workers are processes which sit and listen for jobs on a few queues and then process those jobs.

Target

The worker/manager take a target which can be either a function or a string (importable function).

def target(job_id, job_data):
    pass

manager = Manager(target)
# OR
manager = Manager('__main__.target')

Queues

There are a few different queues that are used. The job queues are just redis lists, manager/worker lists are sets and jobs are hashes.

all:managers - a set of all managers
all:jobs - a queue that all workers can pull jobs from, the values are just the job ids
job:<job_id> - a hash of the job data
<manager>:workers - a set of all workers belonging to a given manager
<manager>:jobs - a queue of jobs for a specific manager, workers will try to pull from here before all:jobs, the values are just the job ids
<worker>:jobs - a queue of jobs for a specific worker, this is meant as a in progress queue for each worker, the workers will pull jobs into this queue from either <manager>:jobs or all:jobs, the values are just the job ids

Basic Usage

from qw.manager import Manager


def job_printer(job_id, job_data):
    print job_id
    print job_data


manager = Manager(job_printer)
manager.start()
manager.join()

API

Manager(object)

__init__(self, target, host="localhost", port=6379, db=0, num_workers=None, name=None)
start(self)
stop(self)
join(self)

Worker(multiprocess.Process)

__init__(self, client, target, manager_name=None, timeout=10)
run(self)
shutdown(self)

CLI Tools

qw-manager

The qw-manager tool is used to start a new manager process with the provided target string, which gets run for every job processed by a worker.

$ qw-manager --help
Usage:
  qw-manager [--level=<log-level>] [--workers=<num-workers>] [--name=<name>] [--host=<host>] [--port=<port>] [--db=<db>] <target>
  qw-manager (--help | --version)

Options:
  --help                       Show this help message
  --version                    Show version information
  -l --level=<log-level>       Set the log level (debug,info,warn,error) [default: info]
  -w --workers=<num-workers>   Set the number of workers to start, defaults to number of cpus
  -n --name=<name>             Set the manager name, defaults to hostname
  -h --host=<host>             Set the redis host to use [default: localhost]
  -p --port=<port>             Set the redis port to use [default: 6379]
  -d --db=<db>                 Set the redis db number to use [default: 0]

qw-client

The qw-client command is useful to look at basic stats of running managers, workers and job queues as well as to push json data in the form of a string or a file to the main queue or a manager specific queue.

$ qw-client --help
Usage:
  qw-client [--host=<host>] [--port=<port>] [--db=<db>] managers
  qw-client [--host=<host>] [--port=<port>] [--db=<db>] workers [<manager>]
  qw-client [--host=<host>] [--port=<port>] [--db=<db>] jobs [<manager>]
  qw-client [--host=<host>] [--port=<port>] [--db=<db>] queue string <data> [<manager>]
  qw-client [--host=<host>] [--port=<port>] [--db=<db>] queue file <file> [<manager>]
  qw-client (--help | --version)

Options:
  --help                       Show this help message
  --version                    Show version information
  -h --host=<host>             Set the redis host to use [default: localhost]
  -p --port=<port>             Set the redis port to use [default: 6379]
  -d --db=<db>                 Set the redis db number to use [default: 0]

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qw