Free Xon - Redis Cache 2.18.1

• Fix XF2.3 support for some add-ons depending on extended redis functionality

• Restore XF2.1 support

• Fix high availability support where css updates would be sent to a possible readonly replica instead of the writable instance

• XF2.3 compatibility update
  • A bug in XenForo 2.3 Beta 1 (Fixed in beta 2) prevents XenForo from using this as a caching backend without manual code patching references to Adapter\AbstractAdapter to Adapter\AdapterInterface
• Add \SV\RedisCache\Repository\Redis::get()->getRedisConnector() method, this should be used instead of \XF::app()->cache() instanceof Redis or similar.

• Disable behavior which caused css.php to return a 404 on an invalid template.
  For the old behaviour of returning a HTTP 404 response, set this config.php option:
  
  $config['svForce404OnEmptyCss'] = true;

• High avaliability config default change:
  • Change default value for retry_reads_on_primary config option to true as this guards against unexpected replication delays
• Remove unexpected differences for XF2.2 and XF2.3 support (only tested on XF2.2)
• When displaying redis version, include the redis varaint type.
  • Known variants are keydb & dragonflydb.
  • Dragonflydb does not appear to support IO stats at the moment

• Update credis library
• Fix possible php 8.1 compatibility issue

• Display maximum memory and maximum memory policy in admincp redis status information block for troubleshooting purposes

• Fix "call to a member function setRedisConnector() on null" when using a non-default advanced configuration option

• Remove displaying if Lua is configured or not, and remove the Lua enable/disable option.
  • Lua support was first added to redis v2.6.0, and this add-on required redis v3
• Rework caching provider code in preparation for XenForo 2.3
  • XF have documented they are switching from Doctrine/Cache to Symfony/Cache
  • I have not tested this on XF2.3, and have coded against the public interfaces of the Symfony/Cache package.
  • A future release may be required for full XF2.3 compatibility.