Django Kazoo Locks

About

Django Kazoo Locks provides a utils for using Zookeeper locks through kazoo in Django applications.

Install

pip install django-kazoo-locks

Usage

Register app in INSTALLED_APPS and define following settings:

ZOOKEEPER_APP_NAMESPACE = 'some-unique-app-name'
ZOOKEEPER_HOSTS = ['10.32.96.201:2181']

Usage example:

lock = Lock('my-lock-{object_id}')
with lock(object_id=123):
    print('so alone')

try:
    with lock(object_id=123, timeout=9):
        print('so alone')
except LockTimeout:
    print('unable to lock after waiting for 9s')

try:
    with lock(object_id=123, blocking=False):
        print('so alone')
except Locked:
    print('unable to lock immediately')

Extras

Migrations

This package defines its version of the data migration command - migrate_with_kazoo. Thanks to this command it is possible to quickly and correctly perform data migration process in applications running simultaneously on many different hosts and using the same database. The command can be used independently or as a base class for the migrate command in your own application. The __init__ method of the defined class accepts the optional lock argument, which allows you to define your own kazoo_locks.locks.Lock object to protect the critical section of the migration.

License

The Django Kazoo Locks package is licensed under the FreeBSD License.