Improve directory tree read performance

app/code/Magento/MediaGalleryUi/Model/Directories/GetFolderTree.php

@@ -10,8 +10,9 @@
 use Magento\Framework\App\Filesystem\DirectoryList;
 use Magento\Framework\Exception\ValidatorException;
 use Magento\Framework\Filesystem;
-use Magento\Framework\Filesystem\Directory\Read;
 use Magento\MediaGalleryApi\Api\IsPathExcludedInterface;
+use Magento\Framework\Filesystem\Driver\File;
+use Magento\Framework\Filesystem\Io\File as FileIo;
 
 /**
  * Build media gallery folder tree structure by path
@@ -28,15 +29,31 @@ class GetFolderTree
      */
     private $isPathExcluded;
 
+    /**
+     * @var File
+     */
+    private $driver;
+
+    /**
+     * @var FileIo
+     */
+    private $file;
+
     /**
      * @param Filesystem $filesystem
+     * @param File $driver
+     * @param FileIo $file
      * @param IsPathExcludedInterface $isPathExcluded
      */
     public function __construct(
         Filesystem $filesystem,
+        File $driver,
+        FileIo $file,
         IsPathExcludedInterface $isPathExcluded
     ) {
         $this->filesystem = $filesystem;
+        $this->driver = $driver;
+        $this->file = $file;
         $this->isPathExcluded = $isPathExcluded;
     }
 
@@ -74,15 +91,13 @@ private function getDirectories(): array
     {
         $directories = [];
 
-        /** @var Read $directory */
-        $directory = $this->filesystem->getDirectoryRead(DirectoryList::MEDIA);
+        $mediaPath = $this->filesystem->getDirectoryRead(DirectoryList::MEDIA)->getAbsolutePath();
+        $directoryList = $this->recursiveRead($mediaPath . '*', GLOB_BRACE | GLOB_ONLYDIR);
 
-        if (!$directory->isDirectory()) {
-            return $directories;
-        }
+        foreach ($directoryList as $path) {
+            $path = str_replace($mediaPath, '', $path);
 
-        foreach ($directory->readRecursively() as $path) {
-            if (!$directory->isDirectory($path) || $this->isPathExcluded->execute($path)) {
+            if ($this->isPathExcluded->execute($path)) {
                 continue;
             }
 
@@ -99,6 +114,29 @@ private function getDirectories(): array
         return $directories;
     }
 
+    /**
+     * Read only directories from file system
+     *
+     * @param string $pattern
+     * @param int $flags
+     */
+    private function recursiveRead(string $pattern, int $flags = 0): array
+    {
+        // phpcs:ignore Magento2.Functions.DiscouragedFunction
+        $directories = glob($pattern, $flags);
+
+        // phpcs:ignore Magento2.Functions.DiscouragedFunction
+        foreach (glob($this->driver->getParentDirectory($pattern) . '/*', $flags) as $dir) {
+            //phpcs:ignore Magento2.Performance.ForeachArrayMerge
+            $directories = array_merge(
+                $directories,
+                $this->recursiveRead($dir . '/' .  $this->file->getPathInfo($pattern)['basename'], $flags)
+            );
+        }
+
+        return $directories;
+    }
+
     /**
      * Find parent directory
      *