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توضیحات

Flask SqlAlchemy router for stateful master-slave replication

ویژگی	مقدار
سیستم عامل	-
نام فایل	flask-replicated-2.1
نام	flask-replicated
نسخه کتابخانه	2.1
نگهدارنده	[]
ایمیل نگهدارنده	[]
نویسنده	Peter Demin
ایمیل نویسنده	peterdemin@gmail.com
آدرس صفحه اصلی	https://github.com/peterdemin/python-flask-replicated
آدرس اینترنتی	https://pypi.org/project/flask-replicated/
مجوز	BSD

.. image:: https://img.shields.io/pypi/v/flask_replicated.svg :target: https://pypi.python.org/pypi/flask_replicated SUMMARY ------- Flask replicated is a Flask extension, designed to work with SqlAlchemy. It's purpose it to provide more or less automatic master-slave replication. On each request, extension determines database usage intention (to read or to write into a database). Then, it picks right database url inside overriden ``db.get_engine()`` whenever request handler tries to access database depending on REST verb used. Flask replicated comes with a security kill-switch to enable developper mode to easily keep control on the feature ``AUTO_READ_ON_SLAVE`` true by default, once deactivated only master database will be used unless explicit use of the decorators. INSTALLATION ------------ 1. Install flask replicated distribution using ``pip install flask_replicated``. Or add ``flask-replicated==1.4`` in requirements.txt and requirements ``pip3 install -r requirements.txt``. 2. Import library ``from flask_replicated import FlaskReplicated`` or ``import flask_replicated`` depending on how you want to call the functions or decorators 3. In flask ``app.config`` configure your database bindings a standard way:: AUTO_READ_ON_SLAVE = True SQLALCHEMY_DATABASE_URI = '%(schema)s://%(user)s:%(password)s@%(master_host)s/%(database)s' SQLALCHEMY_BINDS = { 'master': SQLALCHEMY_DATABASE_URI, 'slave': '%(schema)s://%(user)s:%(password)s@%(slave_host)s/%(database)s' } 4. Register app extension:: app = Flask(...) ... FlaskReplicated(app) USAGE ----- Flask replicated routes SQL queries into different databases based on request method. If method is one of ``READONLY_METHODS`` which are defined as set(['GET', 'HEAD']) and config ``AUTO_READ_ON_SLAVE`` has not been set While this is usually enough there are cases when DB access is not controlled explicitly by your business logic. Good examples are implicit creation of sessions on first access, writing some bookkeeping info, implicit registration of a user account somewhere inside the system. These things can happen at arbitrary moments of time, including during GET requests. To handle these situations wrap appropriate view function with ``@flask_replicated.use_master_database`` decorator. It will mark function to always use master database url. Conversely, wrap the view function with the ``@flask_replicated.use_slave_database`` decorator if you want to ensure that it always uses the slave replica. GET after POST ~~~~~~~~~~~~~~ There is a special case that needs addressing when working with asynchronous replication scheme. Replicas can lag behind a master database on receiving updates. In practice this mean that after submitting a POST form that redirects to a page with updated data this page may be requested from a slave replica that wasn't updated yet. And the user will have an impression that the submit didn't work.

نحوه نصب

نصب پکیج whl flask-replicated-2.1:

pip install flask-replicated-2.1.whl

نصب پکیج tar.gz flask-replicated-2.1:

pip install flask-replicated-2.1.tar.gz