fix(setupcheck): Make the Memcache setupcheck use the cache

Signed-off-by: Joas Schilling <coding@schilljs.com>

[skip ci]

Author: nickvergessen

apps/settings/lib/SetupChecks/MemcacheConfigured.php

@@ -36,6 +36,7 @@ public function __construct(
 		private IL10N $l10n,
 		private IConfig $config,
 		private IURLGenerator $urlGenerator,
+		private ICacheFactory $cacheFactory,
 	) {
 	}
 
@@ -72,6 +73,41 @@ public function run(): SetupResult {
 				$this->urlGenerator->linkToDocs('admin-performance')
 			);
 		}
+
+		if ($this->cacheFactory->isLocalCacheAvailable()) {
+			$random = random_bytes(64);
+			$local = $this->cacheFactory->createLocal('setupcheck.local');
+			try {
+				$local->set('test', $random);
+				$local2 = $this->cacheFactory->createLocal('setupcheck.local');
+				$actual = $local2->get('test');
+				$local->remove('test');
+			} catch (\Throwable) {
+				$actual = null;
+			}
+
+			if ($actual !== $random) {
+				return SetupResult::error($this->l10n->t('Failed to write and read a value from local cache.'));
+			}
+		}
+
+		if ($this->cacheFactory->isAvailable()) {
+			$random = random_bytes(64);
+			$distributed = $this->cacheFactory->createDistributed('setupcheck');
+			try {
+				$distributed->set('test', $random);
+				$distributed2 = $this->cacheFactory->createDistributed('setupcheck');
+				$actual = $distributed2->get('test');
+				$distributed->remove('test');
+			} catch (\Throwable) {
+				$actual = null;
+			}
+
+			if ($actual !== $random) {
+				return SetupResult::error($this->l10n->t('Failed to write and read a value from distributed cache.'));
+			}
+		}
+
 		return SetupResult::success($this->l10n->t('Configured'));
 	}
 }