Add a connection pool class and start utilizing it.

app/src/Bootstrap.php

@@ -26,7 +26,10 @@ use Slovocast\Configuration\SessionSchema;
 use Slovocast\Configuration\SiteInformationSchema;
 use Slovocast\Domain\Repository\User\UserRepository;
 use Slovocast\Domain\Repository\User\UserRepositoryInterface;
+use Slovocast\Infrastructure\Api\Database\ConnectionPoolInterface;
 use Slovocast\Infrastructure\Api\User\UserAuthorizationInterface;
+use Slovocast\Infrastructure\Database\ConnectionPoolConfig;
+use Slovocast\Infrastructure\Database\ConnectionPool;
 use Slovocast\Infrastructure\User\BasicUserAuthorization;
 use Twig\Error\LoaderError;
 
@@ -125,16 +128,17 @@ class Bootstrap
             /**
              * Database Connections
              */
-            MysqlClient::class => function (ContainerInterface $container) {
+            ConnectionPoolInterface::class => function (ContainerInterface $container) {
                 $config = $container->get('config')->get('database');
-                $connectionString = sprintf(
+
-                    "%s:%s@%s/%s",
+                $pool = new ConnectionPool(new ConnectionPoolConfig(
-                    rawurlencode($config['username']),
+                    $config['username'],
-                    rawurlencode($config['password']),
+                    $config['password'],
                     $config['host'],
                     $config['database']
-                );
+                ));
-                return new MysqlClient($connectionString);
+
+                return $pool;
             },
 
             /**
@@ -149,7 +153,7 @@ class Bootstrap
              */
             UserRepositoryInterface::class => function (ContainerInterface $container) {
                 return new UserRepository(
-                    $container->get(MysqlClient::class),
+                    $container->get(ConnectionPoolInterface::class),
                     $container->get(UserAuthorizationInterface::class)
                 );
             }

app/src/Domain/Repository/User/UserRepository.php

@@ -2,16 +2,16 @@
 
 namespace Slovocast\Domain\Repository\User;
 
-use React\Mysql\MysqlClient;
 use Slovocast\Domain\Entity\User;
 use Slovocast\Exception\EntityNotFoundException;
+use Slovocast\Infrastructure\Api\Database\ConnectionPoolInterface;
 use Slovocast\Infrastructure\Api\User\UserAuthorizationInterface;
 use function React\Async\await;
 
 class UserRepository implements UserRepositoryInterface
 {
     public function __construct(
-        private MysqlClient $db,
+        private ConnectionPoolInterface $connectionPool,
         private UserAuthorizationInterface $userAuth
     ) {}
 
@@ -38,7 +38,11 @@ class UserRepository implements UserRepositoryInterface
     public function get(int $id): User
     {
         $query = "SELECT * FROM users WHERE id = ? LIMIT 1";
-        $results = await($this->db->query($query, [ $id ]));
+
+        /** @var $conn ConnectionPool */
+        $conn = $this->connectionPool->getConnection();
+        $results = await($conn->query($query, [ $id ]));
+
         return $this->userFromQueryResults($results->resultRows[0]);
     }
 

app/src/Infrastructure/Database/ConnectionPool.php

@@ -66,11 +66,15 @@ class ConnectionPool implements ConnectionPoolInterface
     {
         if (!$this->hasIdleConnection()) {
             \React\Async\delay((float) $this->getWaitTimeout());
-            return this->getConnection();
+            return $this->getConnection();
         }
 
+        // Remove from the idle pool
         $conn = $this->idleConnections->current();
         $this->idleConnections->detach($conn);
+
+        // Attach to the pool to the connectin, add it to the active pool
+        $conn->setConnectionPool($this);
         $this->activeConnections->attach($conn);
         return $conn;
     }

app/src/Routes.php

@@ -30,7 +30,6 @@ class Routes
 
     /**
      * @param App $app Instantiated Application
-     * @return void
      */
     protected static function users(App $app): void
     {
@@ -47,6 +46,9 @@ class Routes
             ->setName('user-login-action');
     }
 
+    /**
+     * @param App $app Instance of the application
+     */
     protected static function dashboard(App $app): void
     {
         $app->get('/dashboard', DashboardPage::class)