Performance Optimization: Improve filesystem operations

inc/functions/fs.php

@@ -17,6 +17,13 @@
  */
 function wu_get_main_site_upload_dir() {
 
+	// Check for cached value
+	$cached_uploads = wp_cache_get('wu_main_site_upload_dir', 'wu_filesystem');
+
+	if (false !== $cached_uploads) {
+		return $cached_uploads;
+	}
+
 	global $current_site;
 
 	is_multisite() && switch_to_blog($current_site->blog_id);
@@ -29,6 +36,9 @@ function wu_get_main_site_upload_dir() {
 
 	is_multisite() && restore_current_blog();
 
+	// Cache the result for 1 hour - this rarely changes
+	wp_cache_set('wu_main_site_upload_dir', $uploads, 'wu_filesystem', HOUR_IN_SECONDS);
+
 	return $uploads;
 }
 
@@ -43,42 +53,58 @@ function wu_get_main_site_upload_dir() {
  */
 function wu_maybe_create_folder($folder, ...$path) {
 
+	// Generate a cache key for this folder path
+	$cache_key = 'wu_folder_path_' . md5($folder . implode('/', $path));
+
+	// Check for cached path
+	$cached_path = wp_cache_get($cache_key, 'wu_filesystem');
+
+	if (false !== $cached_path) {
+		return $cached_path;
+	}
+
 	$uploads = wu_get_main_site_upload_dir();
 
 	$folder_path = trailingslashit($uploads['basedir'] . '/' . $folder);
 
+	// Use WordPress Filesystem API for better compatibility
+	global $wp_filesystem;
+
+	// Initialize the WP filesystem if needed
+	if (empty($wp_filesystem)) {
+		require_once ABSPATH . '/wp-admin/includes/file.php';
+		WP_Filesystem();
+	}
+
 	/*
 	 * Checks if the folder exists.
 	 */
-	if ( ! file_exists($folder_path)) {
+	if (!$wp_filesystem->exists($folder_path)) {
 
 		// Creates the Folder
 		wp_mkdir_p($folder_path);
 
 		// Creates htaccess
 		$htaccess = $folder_path . '.htaccess';
 
-		if ( ! file_exists($htaccess)) {
-			$fp = @fopen($htaccess, 'w');
-
-			@fwrite($fp, 'deny from all'); // phpcs:ignore
-
-			@fclose($fp); // phpcs:ignore
+		if (!$wp_filesystem->exists($htaccess)) {
+			$wp_filesystem->put_contents($htaccess, 'deny from all', FS_CHMOD_FILE);
 		}
 
 		// Creates index
 		$index = $folder_path . 'index.html';
 
-		if ( ! file_exists($index)) {
-			$fp = @fopen($index, 'w');
-
-			@fwrite($fp, ''); // phpcs:ignore
-
-			@fclose($fp); // phpcs:ignore
+		if (!$wp_filesystem->exists($index)) {
+			$wp_filesystem->put_contents($index, '', FS_CHMOD_FILE);
 		}
 	}
 
-	return $folder_path . implode('/', $path);
+	$full_path = $folder_path . implode('/', $path);
+
+	// Cache the result for 1 hour
+	wp_cache_set($cache_key, $full_path, 'wu_filesystem', HOUR_IN_SECONDS);
+
+	return $full_path;
 }
 
 /**
@@ -92,9 +118,47 @@ function wu_maybe_create_folder($folder, ...$path) {
  */
 function wu_get_folder_url($folder) {
 
+	// Generate a cache key for this folder URL
+	$cache_key = 'wu_folder_url_' . md5($folder);
+
+	// Check for cached URL
+	$cached_url = wp_cache_get($cache_key, 'wu_filesystem');
+
+	if (false !== $cached_url) {
+		return $cached_url;
+	}
+
 	$uploads = wu_get_main_site_upload_dir();
 
 	$folder_url = trailingslashit($uploads['baseurl'] . '/' . $folder);
 
-	return set_url_scheme($folder_url);
+	$url = set_url_scheme($folder_url);
+
+	// Cache the result for 1 hour
+	wp_cache_set($cache_key, $url, 'wu_filesystem', HOUR_IN_SECONDS);
+
+	return $url;
+}
+
+/**
+ * Clears the filesystem cache.
+ *
+ * @since 2.0.0
+ *
+ * @param string $folder Optional. If provided, only clears cache for this folder.
+ * @return void
+ */
+function wu_clear_filesystem_cache($folder = '') {
+
+	// Clear main site upload dir cache
+	wp_cache_delete('wu_main_site_upload_dir', 'wu_filesystem');
+
+	// If a specific folder is provided, only clear that folder's cache
+	if (!empty($folder)) {
+		$folder_path_key = 'wu_folder_path_' . md5($folder);
+		$folder_url_key = 'wu_folder_url_' . md5($folder);
+
+		wp_cache_delete($folder_path_key, 'wu_filesystem');
+		wp_cache_delete($folder_url_key, 'wu_filesystem');
+	}
 }