Adds a Redis Locking Strategy for TYPO3 frontend page generation, useful on distributed systems with NFS.
TYPO3 has three built-in Locking Strategies, that are chosen at runtime which fits best for the current system setup.
However, when dealing with a multi-tier system and a shared file system with multiple frontend nodes with a NFS filesystem, it is especially helpful to use a better suitable format. Redis is our weapon of choice for handling multi-node scenarios, and works just fine with TYPO3 and Caching.
This extension provides a Redis Locking mechanism to store the locks in a (shared) Redis database.
This extension is available for TYPO3 v8+ LTS, and requires the PHP package
php-redis as well as a Redis server.
Install this extension via composer
composer require b13/distributed-locks or extensions.typo3.org / Extension Manager,
and activate it in the Extension Manager.
Now add the following lines to your LocalConfiguration / AdditionalConfiguration to activate Redis Locking.
$GLOBALS['TYPO3_CONF_VARS']['SYS']['locking']['redis'] = [ 'hostname' => '127.0.0.1', 'database' => 12 ];
'ttl' (numeric, default is 30sec) 'port' (numeric, default is 6379) 'password' (contains the password, necessary for secure authentication if required by redis) 'priority' (numeric, default is 95) - Set priority for this locking strategy. See LockingApi documentation.
Should be switched to
symfony/lock to allow distributed redis services and other lockers.
Inspiration was taken from the now unmaintained extension "redis_lock_strategy" which we used several times, however with some drawbacks:
- No stable version for TYPO3 v9 in composer mode
- No maintainer available for releases anymore
- Destroying an object did not remove locks, ending in certain dead lock scenarios in broken scripts
Thanks to Alexander Miehe for the initial extension and the conceptual work.
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