Utils for using Zookeeper locks through zookeeper in Django commands and views.
Project description
Django Zookeeper Locks
About
Django Zookeeper Locks provides a utils for using Zookeeper locks through zookeeper in Django applications.
Install
pip install django-zookeeper-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_zookeeper
. 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 zookeeper_locks.locks.Lock
object to protect the critical section
of the migration.
License
The Django Zookeeper Locks package is licensed under the FreeBSD License.
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