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توضیحات

Postgres locking routines and lock table access.

ویژگی	مقدار
سیستم عامل	-
نام فایل	django-pglock-1.1.0
نام	django-pglock
نسخه کتابخانه	1.1.0
نگهدارنده	[]
ایمیل نگهدارنده	[]
نویسنده	Opus 10 Engineering
ایمیل نویسنده	-
آدرس صفحه اصلی	https://github.com/Opus10/django-pglock
آدرس اینترنتی	https://pypi.org/project/django-pglock/
مجوز	BSD-3-Clause

django-pglock ############# ``django-pglock`` performs advisory locks, table locks, and helps manage blocking locks. Here's some of the functionality at a glance: * ``pglock.advisory`` for application-level locking, for example, ensuring that tasks don't overlap. * ``pglock.model`` for locking an entire model. * ``pglock.timeout`` for dynamically setting the timeout to acquire a lock. * ``pglock.prioritize`` to kill blocking locks for critical code, such as migrations. * The ``PGLock`` and ``BlockedPGLock`` models for querying active and blocked locks. * The ``pglock`` management command that wraps the models and provides other utilities. Quickstart ========== Advisory Locks -------------- Use ``pglock.advisory`` to acquire a `Postgres advisory lock <https://www.postgresql.org/docs/current/explicit-locking.html#ADVISORY-LOCKS>`__: .. code-block:: python import pglock with pglock.advisory("my_lock_id"): # This code blocks until the "my_lock_id" lock is available Above our code will block until the lock is available, meaning no instances of the function will run simultaneously. Use the ``timeout`` argument to configure how long to wait for the lock. A timeout of zero will return immediately: .. code-block:: python with pglock.advisory("my_lock_id", timeout=0) as acquired: if acquired: # The lock is acquired Use ``side_effect=pglock.Raise`` to raise a ``django.db.utils.OperationalError`` if the lock can't be acquired. When using the decorator, you can also use ``side_effect=pglock.Skip`` to skip the function if the lock can't be acquired: .. code-block:: python @pglock.advisory(timeout=0, side_effect=pglock.Skip) def non_overlapping_func(): # This function will not run if there's another one already running. # The decorator lock ID defaults to <module_name>.<function_name> Model Locks ----------- ``pglock.model`` can take a lock on an entire model during a transaction. For example: .. code-block:: python from django.db import transaction import pglock with transaction.atomic(): pglock.model("auth.User") # Any operations on auth.User will be exclusive here. Even read access # for other transactions is blocked ``pglock.model`` uses `Postgres's LOCK statement <https://www.postgresql.org/docs/current/sql-lock.html>`__, and it accepts the lock mode as a argument. See the `Postgres docs for more information <https://www.postgresql.org/docs/current/sql-lock.html>`__. **Note** ``pglock.model`` is similar to ``pglock.advisory``. Use the ``timeout`` argument to avoid waiting for locks, and supply the appropriate ``side_effect`` to adjust runtime behavior. Prioritizing Blocked Code ------------------------- ``pglock.prioritize`` will terminate any locks blocking the wrapped code: .. code-block:: python import pglock @pglock.prioritize() def my_func(): # Any other statements that have conflicting locks will be killed on a # periodic interval. MyModel.objects.update(val="value") ``pglock.prioritize`` is useful for prioritizing code, such as migrations, to avoid situations where locks are held for too long. Setting the Lock Timeout ------------------------ Use ``pglock.timeout`` to dynamically set `Postgres's lock_timeout runtime setting <https://www.postgresql.org/docs/current/runtime-config-client.html>`__: .. code-block:: python import pglock @pglock.timeout(1) def do_stuff(): # This function will throw an exception if any code takes longer than # one second to acquire a lock Querying Locks -------------- Use ``pglock.models.PGLock`` to query active locks. It wraps `Postgres's pg_locks view <https://www.postgresql.org/docs/current/view-pg-locks.html>`__. Use ``pglock.models.BlockedPGLock`` to query locks and join the activity that's blocking them. Use ``python manage.py pglock`` to view and kill locks from the command line. It has several options for dynamic filters and re-usable configuration. Compatibility ============= ``django-pglock`` is compatible with Python 3.7 - 3.10, Django 2.2 - 4.1, and Postgres 10 - 15. Documentation ============= `View the django-pglock docs here <https://django-pglock.readthedocs.io/>`_ to learn more about: * Using advisory locks. * Locking models. * Setting dynamic lock timeouts. * Killing blocking locks. * The proxy models and custom queryset methods. * Using and configuring the management command. Installation ============ Install django-pglock with:: pip3 install django-pglock After this, add both ``pgactivity`` and ``pglock`` to the ``INSTALLED_APPS`` setting of your Django project. Contributing Guide ================== For information on setting up django-pglock for development and contributing changes, view `CONTRIBUTING.rst <CONTRIBUTING.rst>`_. Primary Authors =============== - `Wes Kendall <https://github.com/wesleykendall>`__ - `Paul Gilmartin <https://github.com/PaulGilmartin>`__

نیازمندی

مقدار	نام
>=2	django
>=1.1,<2	django-pgactivity
>=4)	importlib_metadata

زبان مورد نیاز

مقدار	نام
>=3.7.0,<4	Python

نحوه نصب

نصب پکیج whl django-pglock-1.1.0:

pip install django-pglock-1.1.0.whl

نصب پکیج tar.gz django-pglock-1.1.0:

pip install django-pglock-1.1.0.tar.gz