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django-dbconn-retry-python27-0.1.6


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توضیحات

Patch Django to retry a database connection first before failing.
ویژگی مقدار
سیستم عامل -
نام فایل django-dbconn-retry-python27-0.1.6
نام django-dbconn-retry-python27
نسخه کتابخانه 0.1.6
نگهدارنده []
ایمیل نگهدارنده []
نویسنده GoPythonGo.com
ایمیل نویسنده info@gopythongo.com, scottb@opennetworking.org
آدرس صفحه اصلی https://github.com/jdelic/django-dbconn-retry/
آدرس اینترنتی https://pypi.org/project/django-dbconn-retry-python27/
مجوز -
Django Database Connection Autoreconnect ======================================== .. image:: https://coveralls.io/repos/github/jdelic/django-dbconn-retry/badge.svg?branch=HEAD :target: https://coveralls.io/github/jdelic/django-dbconn-retry?branch=HEAD .. image:: https://travis-ci.org/jdelic/django-dbconn-retry.svg?branch=master :target: https://travis-ci.org/jdelic/django-dbconn-retry This library monkeypatches ``django.db.backends.base.BaseDatabaseWrapper`` so that when a database operation fails because the underlying TCP connection was already closed, it first tried to reconnect, instead of immediately raising an ``OperationException``. Why is this useful? ------------------- I use `HAProxy`_ as a load-balancer in front of my PostgreSQL databases all the time, sometimes in addition to ``pgbouncer``. Even though you can mostly prevent surprises by enabling TCP keep-alive packets through `tcpka`_, `clitcpka`_ and `srvtcpka`_, I still encounter situations where the underlying TCP connection has been closed through the load-balancer. Most often this results in .. code-block:: django.db.utils.OperationalError: server closed the connection unexpectedly This probably means the server terminated abnormally before or while processing the request. This library patches Django such that it try to reconnect once before failing. Another application of this is when using `Hashicorp Vault`_, where credentials for a database connection can expire at any time and then need to be refreshed from Vault. How to install? --------------- Just pull the library in using ``pip install django-dbconn-retry``. Then add ``django_dbconn_retry`` to ``INSTALLED_APPS`` in your ``settings.py``. Settings --------------- DATABASES = { 'default': { ... 'MAX_RETRIES': 2, # 'RETRY_DELAY': .500, # in seconds } } Signals ------- The library provides an interface for other code to plug into the process to, for example, allow `12factor-vault`_ to refresh the database credentials before the code tries to reestablish the database connection. These are implemented using `Django Signals`_. =========================== ================================================== Signal Description =========================== ================================================== ``pre_reconnect`` Installs a hook of the type ``Callable[[type, BaseDatabaseWrapper], None]`` that will be called before the library tries to reestablish a connection. 12factor-vault uses this to refresh the database credentials from Vault. ``post_reconnect`` Installs a hook of the type ``Callable[[type, BaseDatabaseWrapper], None]`` that will be called after the library tried to reestablish the connection. Success or failure has not been tested at this point. So the connection may be in any state. =========================== ================================================== License ======= Copyright (c) 2018, Jonas Maurus All rights reserved. Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met: 1. Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer. 2. Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution. 3. Neither the name of the copyright holder nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission. THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. .. _12factor-vault: https://github.com/jdelic/12factor-vault/ .. _Django Signals: https://docs.djangoproject.com/en/dev/topics/signals/ .. _HAProxy: http://www.haproxy.org/ .. _tcpka: https://cbonte.github.io/haproxy-dconv/1.8/configuration.html#option%20tcpka .. _clitcpka: https://cbonte.github.io/haproxy-dconv/1.8/configuration.html#4-option%20clitcpka .. _srvtcpka: https://cbonte.github.io/haproxy-dconv/1.8/configuration.html#option%20srvtcpka .. _Hashicorp Vault: https://vaultproject.io/


نحوه نصب


نصب پکیج whl django-dbconn-retry-python27-0.1.6:

    pip install django-dbconn-retry-python27-0.1.6.whl


نصب پکیج tar.gz django-dbconn-retry-python27-0.1.6:

    pip install django-dbconn-retry-python27-0.1.6.tar.gz