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A convenience wrapper for Gearman clients and workers in Django/Python
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django_gearman
gearman_example
.gitignore
CONTRIBUTORS
MANIFEST.in
README.md
requirements.txt
setup.py

README.md

django-gearman

django-gearman is a convenience wrapper for the Gearman Python Bindings.

With django-gearman, you can code jobs as well as clients in a Django project with minimal overhead in your application. Server connections etc. all take place in django-gearman and don't unnecessarily clog your application code.

Installation

It's the same for both the client and worker instances of your django project:

pip install -e git://github.com/fwenzel/django-gearman.git#egg=django-gearman

Add django_gearman to the INSTALLED_APPS section of settings.py.

Specify the following settings in your local settings.py file:

# One or more gearman servers
GEARMAN_SERVERS = ['127.0.0.1']

# gearman job name pattern. Namespacing etc goes here. This is the pattern
# your jobs will register as with the server, and that you'll need to use
# when calling them from a non-django-gearman client.
# replacement patterns are:
# %(app)s : django app name the job is filed under
# %(job)s : job name
GEARMAN_JOB_NAME = '%(app)s.%(job)s'

Workers

Registering jobs

Create a file gearman_jobs.py in any of your django apps, and define as many jobs as functions as you like. The jobs must accept a single argument as passed by the caller and must return the result of the operation, if applicable. (Note: It must accept an argument, even if you don't use it).

Mark each of these functions as gearman jobs by decorating them with django_gearman.decorators.gearman_job.

For an example, look at the gearman_example app's gearman_jobs.py file.

Starting a worker

To start a worker, run python manage.py gearman_worker. It will start serving all registered jobs.

To spawn more than one worker (if, e.g., most of your jobs are I/O bound), use the -w option:

python manage.py gearman_worker -w 5

will start five workers.

Since the process will keep running while waiting for and executing jobs, you probably want to run this in a screen session or similar.

Clients

To make your workers work, you need a client app passing data to them. Create and instance of the django_gearman.GearmanClient class and execute a django_gearman.Task with it:

from django_gearman import GearmanClient, Task
client = GearmanClient()
res = client.do_task(Task("gearman_example.reverse", sentence))
print "Result: '%s'" % res

The notation for the task name is appname.jobname, no matter what pattern you have defined in GEARMAN_JOB_NAME.

Dispatching a background event without waiting for the result is easy as well:

client.dispatch_background_task('gearman_example.background_counting', None)

For a live example look at the gearman_example app, in the management/commands/gearman_example_client.py file.

Example App

For a full, working, example application, add gearman_example to your INSTALLED_APPS, then run a worker in one shell:

python manage.py gearman_worker -w 4

and execute the example app in another:

python manage.py gearman_example_client

You can see the client sending data and the worker(s) working on it.

Licensing

This software is licensed under the Mozilla Tri-License:

***** BEGIN LICENSE BLOCK *****
Version: MPL 1.1/GPL 2.0/LGPL 2.1

The contents of this file are subject to the Mozilla Public License Version
1.1 (the "License"); you may not use this file except in compliance with
the License. You may obtain a copy of the License at
http://www.mozilla.org/MPL/

Software distributed under the License is distributed on an "AS IS" basis,
WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
for the specific language governing rights and limitations under the
License.

The Original Code is django-gearman.

The Initial Developer of the Original Code is Mozilla.
Portions created by the Initial Developer are Copyright (C) 2010
the Initial Developer. All Rights Reserved.

Contributor(s):
  Frederic Wenzel <fwenzel@mozilla.com>

Alternatively, the contents of this file may be used under the terms of
either the GNU General Public License Version 2 or later (the "GPL"), or
the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
in which case the provisions of the GPL or the LGPL are applicable instead
of those above. If you wish to allow use of your version of this file only
under the terms of either the GPL or the LGPL, and not to allow others to
use your version of this file under the terms of the MPL, indicate your
decision by deleting the provisions above and replace them with the notice
and other provisions required by the GPL or the LGPL. If you do not delete
the provisions above, a recipient may use your version of this file under
the terms of any one of the MPL, the GPL or the LGPL.

***** END LICENSE BLOCK *****
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