add cache storage placeholder

backend/app/Storage/EmptyStorage.php

@@ -0,0 +1,64 @@
+<?php
+
+declare(strict_types=1);
+/**
+ * This file is part of Hyperf.
+ *
+ * @link     https://www.hyperf.io
+ * @document https://hyperf.wiki
+ * @contact  group@hyperf.io
+ * @license  https://github.com/hyperf/hyperf/blob/master/LICENSE
+ */
+
+namespace App\Storage;
+
+use bandwidthThrottle\tokenBucket\storage\scope\GlobalScope;
+use bandwidthThrottle\tokenBucket\storage\Storage;
+use Hyperf\RateLimit\Storage\StorageInterface;
+use Psr\Container\ContainerInterface;
+
+class EmptyStorage implements StorageInterface, Storage, GlobalScope
+{
+    public function __construct(ContainerInterface $container, string $key, int $timeout, array $options = [])
+    {
+    }
+
+    public function getMutex()
+    {
+        return new class {
+            public function check($callback)
+            {
+                return $this;
+            }
+
+            public function then($callback)
+            {
+                return $this;
+            }
+        };
+    }
+
+    public function isBootstrapped()
+    {
+    }
+
+    public function bootstrap($microtime)
+    {
+    }
+
+    public function remove()
+    {
+    }
+
+    public function setMicrotime($microtime)
+    {
+    }
+
+    public function letMicrotimeUnchanged()
+    {
+    }
+
+    public function getMicrotime()
+    {
+    }
+}

backend/app/Storage/MemoryTableStorage.php

@@ -0,0 +1,14 @@
+<?php 
+
+use Hyperf\RateLimit\Storage\StorageInterface;
+use Psr\Container\ContainerInterface;
+
+class MemoryTableStorage implements StorageInterface
+{
+
+    // @TODO 使用 https://wiki.swoole.com/zh-cn/#/memory/table 创建限流的缓存系统
+    public function __construct(ContainerInterface $container, string $key, int $timeout, array $options = [])
+        {
+            throw new \Exception('Not implemented');
+        }
+}