add room list memcache

src/Controller/RoomController.php

@@ -49,6 +49,13 @@ class RoomController extends AbstractController
         ?Request $request
     ): Response
     {
+        // Connect memcached
+        $memcached = new \Memcached();
+        $memcached->addServer(
+            $this->getParameter('app.memcached.host'),
+            $this->getParameter('app.memcached.port')
+        );
+
         // Connect kevacoin
         $client = new \Kevachat\Kevacoin\Client(
             $this->getParameter('app.kevacoin.protocol'),
@@ -59,6 +66,15 @@ class RoomController extends AbstractController
         );
 
         // Get room list
+        $memory = md5(
+            sprintf(
+                '%s.RoomController::list:list',
+                __DIR__,
+            ),
+        );
+
+        if (!$list = $memcached->get($memory))
+        {
             $list = [];
 
             foreach ((array) $client->kevaListNamespaces() as $value)
@@ -116,6 +132,13 @@ class RoomController extends AbstractController
                 $list
             );
 
+            // Cache result
+            $memcached->set(
+                $memory,
+                $list
+            );
+        }
+
         // RSS
         if ('rss' === $request->get('feed'))
         {