feat: add stats endpoint

src/Controller/StatisticsController.php

@@ -0,0 +1,74 @@
+<?php
+
+namespace App\Controller;
+
+use App\Entity\Statistics;
+use App\Repository\DomainRepository;
+use App\Repository\WatchListRepository;
+use Psr\Cache\CacheItemPoolInterface;
+use Psr\Cache\InvalidArgumentException;
+use Symfony\Bundle\FrameworkBundle\Controller\AbstractController;
+use Symfony\Component\HttpKernel\KernelInterface;
+
+class StatisticsController extends AbstractController
+{
+    public function __construct(
+        private readonly CacheItemPoolInterface $pool,
+        private readonly DomainRepository $domainRepository,
+        private readonly WatchListRepository $watchListRepository,
+        private readonly KernelInterface $kernel
+    ) {
+    }
+
+    /**
+     * @throws InvalidArgumentException
+     */
+    public function __invoke(): Statistics
+    {
+        $stats = new Statistics();
+
+        $stats
+            ->setRdapQueries($this->pool->getItem('stats.rdap_queries.count')->get() ?? 0)
+            ->setDomainPurchased($this->pool->getItem('stats.domain.purchased')->get() ?? 0)
+            ->setDomainPurchaseFailed($this->pool->getItem('stats.domain.purchase.failed')->get() ?? 0)
+            ->setAlertSent($this->pool->getItem('stats.alert.sent')->get() ?? 0)
+            ->setWatchlistCount(
+                $this->getCachedItem('stats.watchlist.count', fn () => $this->watchListRepository->count()
+                ))
+            ->setDomainCount(
+                $this->getCachedItem('stats.domain.count', fn () => $this->domainRepository->createQueryBuilder('d')
+                    ->join('d.tld', 't')
+                    ->select('t.tld tld')
+                    ->addSelect('COUNT(d.ldhName) AS domain')
+                    ->addGroupBy('t.tld')
+                    ->orderBy('domain', 'DESC')
+                    ->setMaxResults(5)
+                    ->getQuery()->getArrayResult())
+            )
+            ->setDomainCountTotal(
+                $this->getCachedItem('stats.domain.total', fn () => $this->domainRepository->count()
+                ));
+
+        return $stats;
+    }
+
+    /**
+     * @throws InvalidArgumentException
+     */
+    private function getCachedItem(string $key, callable $getItemFunction)
+    {
+        $item = $this->pool->getItem($key);
+
+        if (!$item->isHit() || $this->kernel->isDebug()) {
+            $value = $getItemFunction();
+            $item
+                ->set($value)
+                ->expiresAfter(24 * 60 * 60);
+            $this->pool->save($item);
+
+            return $value;
+        } else {
+            return $item->get();
+        }
+    }
+}