Implementing simple Redis cache for RSS.

.env

@@ -17,6 +17,9 @@ APP_DATABASE_URL=postgres://$PGUSER:$PGPASSWORD@127.0.0.1:5436/test?application_
 MAGNETICOD_DATABASE_URL=postgres://$PGUSER:$PGPASSWORD@127.0.0.1:5436/test?application_name=magnetico_web
 ###< doctrine/doctrine-bundle ###
 
+# Redis cache
+REDIS_DSN=redis://127.0.0.1:6379/0
+
 ###> sentry/sentry-symfony ###
 SENTRY_DSN=
 ###< sentry/sentry-symfony ###

config/packages/framework.yaml

@@ -28,3 +28,9 @@ framework:
 
         # APCu (not recommended with heavy random-write workloads as memory fragmentation can cause perf issues)
         #app: cache.adapter.apcu
+        prefix_seed: magnetico-web
+        pools:
+            magneticod.cache:
+                adapter: cache.adapter.redis
+                provider: '%env(REDIS_DSN)%'
+                default_lifetime: 600

src/Api/V1/Controller/RssController.php

@@ -5,16 +5,24 @@ namespace App\Api\V1\Controller;
 use App\Feed\RssGenerator;
 use Symfony\Component\HttpFoundation\{Request, Response};
 use Symfony\Bundle\FrameworkBundle\Controller\AbstractController;
+use Symfony\Contracts\Cache\CacheInterface;
+use Symfony\Contracts\Cache\ItemInterface;
 
 class RssController extends AbstractController
 {
     private const CONTENT_TYPE = 'application/rss+xml';
+    private const CACHE_KEY = 'rss_last';
+    private const CACHE_LIFETIME = 600;
 
-    public function last(Request $request, RssGenerator $generator): Response
+    public function last(Request $request, RssGenerator $generator, CacheInterface $magneticodCache): Response
     {
         $page = (int) $request->query->get('page', '1');
 
-        $xml = $generator->generateLast($page);
+        $xml = $magneticodCache->get(self::CACHE_KEY, function (ItemInterface $item) use ($generator, $page) {
+            $item->expiresAfter(self::CACHE_LIFETIME);
+
+            return $generator->generateLast($page);
+        });
 
         return new Response($xml, 200, ['Content-Type' => self::CONTENT_TYPE]);
     }