8000 Adding MigratingSessionHandler docs by rossmotley · Pull Request #9496 · symfony/symfony-docs · GitHub
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Adding MigratingSessionHandler docs #9496

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Merged
merged 5 commits into from
May 24, 2018
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Adding MigratingSessionHandler docs #9496

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91aa58d
Adding MigratingSessionHandler docs
rossmotley Mar 26, 2018
e971074
Update session_configuration.rst
rossmotley May 17, 2018
7c8264d
Update session_configuration.rst
rossmotley May 17, 2018
386f639
Reworded and simplified
javiereguiluz May 22, 2018
e93756f
Added the versionadded directive
javiereguiluz May 24, 2018
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27 changes: 27 additions & 0 deletions components/http_foundation/session_configuration.rst
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Expand Up @@ -73,6 +73,7 @@ easily serve as examples if you wish to write your own.

* :class:`Symfony\\Component\\HttpFoundation\\Session\\Storage\\Handler\\PdoSessionHandler`
* :class:`Symfony\\Component\\HttpFoundation\\Session\\Storage\\Handler\\MemcachedSessionHandler`
* :class:`Symfony\\Component\\HttpFoundation\\Session\\Storage\\Handler\\MigratingSessionHandler`
* :class:`Symfony\\Component\\HttpFoundation\\Session\\Storage\\Handler\\RedisSessionHandler`
* :class:`Symfony\\Component\\HttpFoundation\\Session\\Storage\\Handler\\MongoDbSessionHandler`
* :class:`Symfony\\Component\\HttpFoundation\\Session\\Storage\\Handler\\NullSessionHandler`
Expand All @@ -87,6 +88,32 @@ Example usage::
$sessionStorage = new NativeSessionStorage(array(), new PdoSessionHandler($pdo));
$session = new Session($sessionStorage);

Migrating Between Save Handlers
-------------------------------

.. versionadded:: 4.1
  The ``MigratingSessionHandler`` class was introduced in Symfony 4.1.

If your application changes the way sessions are stored, use the
:class:`Symfony\\Component\\HttpFoundation\\Session\\Storage\\Handler\\MigratingSessionHandler`
to migrate between old and new save handlers without losing session data.

This is the recommended migration workflow:

#. Switch to the migrating handler, with your new handler as the write-only one.
The old handler behaves as usual and sessions get written to the new one::

$sessionStorage = new MigratingSessionHandler($oldSessionStorage, $newSessionStorage);

#. After your session gc period, verify that the data in the new handler is correct.
#. Update the migrating handler to use the old handler as the write-only one, so
the sessions will now be read from the new handler. This step allows easier rollbacks::

$sessionStorage = new MigratingSessionHandler($newSessionStorage, $oldSessionStorage);

#. After verifying that the sessions in your application are working, switch
from the migrating handler to the new handler.

Configuring PHP Sessions
~~~~~~~~~~~~~~~~~~~~~~~~

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