Merge pull request #40293 from nextcloud/bugfix/noid/only-use-memory-cache-backend-for-redis

fix(ratelimit): Only use memory cache backend for redis

Author: miaulalala

lib/private/Server.php

@@ -786,8 +786,8 @@ public function __construct($webRoot, \OC\Config $config) {
 		$this->registerDeprecatedAlias('Search', ISearch::class);
 
 		$this->registerService(\OC\Security\RateLimiting\Backend\IBackend::class, function ($c) {
-			$cacheFactory = $c->get(ICacheFactory::class);
-			if ($cacheFactory->isAvailable()) {
+			$config = $c->get(\OCP\IConfig::class);
+			if (ltrim($config->getSystemValueString('memcache.distributed', ''), '\\') === \OC\Memcache\Redis::class) {
 				$backend = new \OC\Security\RateLimiting\Backend\MemoryCacheBackend(
 					$c->get(AllConfig::class),
 					$this->get(ICacheFactory::class),