feat(settings): add setup check for redis memcache

Signed-off-by: Ferdinand Thiessen <opensource@fthiessen.de>

Author: susnux

apps/settings/composer/composer/autoload_classmap.php

@@ -111,6 +111,7 @@
     'OCA\\Settings\\SetupChecks\\LoggingLevel' => $baseDir . '/../lib/SetupChecks/LoggingLevel.php',
     'OCA\\Settings\\SetupChecks\\MaintenanceWindowStart' => $baseDir . '/../lib/SetupChecks/MaintenanceWindowStart.php',
     'OCA\\Settings\\SetupChecks\\MemcacheConfigured' => $baseDir . '/../lib/SetupChecks/MemcacheConfigured.php',
+    'OCA\\Settings\\SetupChecks\\MemcacheLegacy' => $baseDir . '/../lib/SetupChecks/MemcacheLegacy.php',
     'OCA\\Settings\\SetupChecks\\MimeTypeMigrationAvailable' => $baseDir . '/../lib/SetupChecks/MimeTypeMigrationAvailable.php',
     'OCA\\Settings\\SetupChecks\\MysqlRowFormat' => $baseDir . '/../lib/SetupChecks/MysqlRowFormat.php',
     'OCA\\Settings\\SetupChecks\\MysqlUnicodeSupport' => $baseDir . '/../lib/SetupChecks/MysqlUnicodeSupport.php',

apps/settings/composer/composer/autoload_static.php

@@ -126,6 +126,7 @@ class ComposerStaticInitSettings
         'OCA\\Settings\\SetupChecks\\LoggingLevel' => __DIR__ . '/..' . '/../lib/SetupChecks/LoggingLevel.php',
         'OCA\\Settings\\SetupChecks\\MaintenanceWindowStart' => __DIR__ . '/..' . '/../lib/SetupChecks/MaintenanceWindowStart.php',
         'OCA\\Settings\\SetupChecks\\MemcacheConfigured' => __DIR__ . '/..' . '/../lib/SetupChecks/MemcacheConfigured.php',
+        'OCA\\Settings\\SetupChecks\\MemcacheLegacy' => __DIR__ . '/..' . '/../lib/SetupChecks/MemcacheLegacy.php',
         'OCA\\Settings\\SetupChecks\\MimeTypeMigrationAvailable' => __DIR__ . '/..' . '/../lib/SetupChecks/MimeTypeMigrationAvailable.php',
         'OCA\\Settings\\SetupChecks\\MysqlRowFormat' => __DIR__ . '/..' . '/../lib/SetupChecks/MysqlRowFormat.php',
         'OCA\\Settings\\SetupChecks\\MysqlUnicodeSupport' => __DIR__ . '/..' . '/../lib/SetupChecks/MysqlUnicodeSupport.php',

apps/settings/lib/AppInfo/Application.php

@@ -49,6 +49,7 @@
 use OCA\Settings\SetupChecks\LegacySSEKeyFormat;
 use OCA\Settings\SetupChecks\MaintenanceWindowStart;
 use OCA\Settings\SetupChecks\MemcacheConfigured;
+use OCA\Settings\SetupChecks\MemcacheLegacy;
 use OCA\Settings\SetupChecks\MimeTypeMigrationAvailable;
 use OCA\Settings\SetupChecks\MysqlRowFormat;
 use OCA\Settings\SetupChecks\MysqlUnicodeSupport;
@@ -193,6 +194,7 @@ public function register(IRegistrationContext $context): void {
 		$context->registerSetupCheck(LegacySSEKeyFormat::class);
 		$context->registerSetupCheck(MaintenanceWindowStart::class);
 		$context->registerSetupCheck(MemcacheConfigured::class);
+		$context->registerSetupCheck(MemcacheLegacy::class);
 		$context->registerSetupCheck(MimeTypeMigrationAvailable::class);
 		$context->registerSetupCheck(MysqlRowFormat::class);
 		$context->registerSetupCheck(MysqlUnicodeSupport::class);

apps/settings/lib/SetupChecks/MemcacheLegacy.php

@@ -0,0 +1,59 @@
+<?php
+
+declare(strict_types=1);
+
+/**
+ * SPDX-FileCopyrightText: 2026 Nextcloud GmbH and Nextcloud contributors
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+namespace OCA\Settings\SetupChecks;
+
+use OC\Memcache\Redis;
+use OCP\IConfig;
+use OCP\IL10N;
+use OCP\IURLGenerator;
+use OCP\SetupCheck\ISetupCheck;
+use OCP\SetupCheck\SetupResult;
+
+class MemcacheLegacy implements ISetupCheck {
+	public function __construct(
+		private readonly IL10N $l10n,
+		private readonly IConfig $config,
+		private readonly IURLGenerator $urlGenerator,
+	) {
+	}
+
+	#[\Override]
+	public function getName(): string {
+		return $this->l10n->t('Redis cache');
+	}
+
+	#[\Override]
+	public function getCategory(): string {
+		return 'system';
+	}
+
+	#[\Override]
+	public function run(): SetupResult {
+		if ($this->isLegacyRedisUsed()) {
+			return SetupResult::info(
+				$this->l10n->t('You are still using the old Redis cache backend. For full support of latest Valkey and Redis features, like clustering and sentinel, please switch to the new KeyValueCache backend.'),
+				$this->urlGenerator->linkToDocs('admin-cache')
+			);
+		} else {
+			return SetupResult::success($this->l10n->t('No legacy Redis cache detected'));
+		}
+	}
+
+	protected function isLegacyRedisUsed(): bool {
+		$memcacheDistributedClass = $this->config->getSystemValue('memcache.distributed', null);
+		$memcacheLockingClass = $this->config->getSystemValue('memcache.locking', null);
+
+		/** @psalm-suppress DeprecatedClass */
+		if ($memcacheDistributedClass === Redis::class || $memcacheLockingClass === Redis::class) {
+			return true;
+		}
+		return false;
+	}
+}