From c6343db57da984530c57c425719d8f43a4eefb34 Mon Sep 17 00:00:00 2001
From: skjnldsv <skjnldsv@protonmail.com>
Date: Thu, 27 Jun 2024 09:21:22 +0200
Subject: [PATCH] feat: spread group folder expiry background job

Signed-off-by: skjnldsv <skjnldsv@protonmail.com>

[skip ci]
---
 lib/AppInfo/Application.php                 |  5 +-
 lib/BackgroundJob/ExpireGroupVersions.php   | 51 +++++++++++++++++++--
 lib/Versions/GroupVersionsExpireManager.php |  7 +++
 3 files changed, 57 insertions(+), 6 deletions(-)

diff --git a/lib/AppInfo/Application.php b/lib/AppInfo/Application.php
index f044d163a..317362b49 100644
--- a/lib/AppInfo/Application.php
+++ b/lib/AppInfo/Application.php
@@ -184,8 +184,11 @@ public function register(IRegistrationContext $context): void {
 		$context->registerService(\OCA\GroupFolders\BackgroundJob\ExpireGroupVersions::class, function (IAppContainer $c) {
 			if (interface_exists(\OCA\Files_Versions\Versions\IVersionBackend::class)) {
 				return new ExpireGroupVersionsJob(
+					$c->get(ITimeFactory::class),
 					$c->get(GroupVersionsExpireManager::class),
-					$c->get(ITimeFactory::class)
+					$c->get(IAppConfig::class),
+					$c->get(FolderManager::class),
+					$c->get(LoggerInterface::class),
 				);
 			}
 
diff --git a/lib/BackgroundJob/ExpireGroupVersions.php b/lib/BackgroundJob/ExpireGroupVersions.php
index 7a13a3d1e..1fa214b60 100644
--- a/lib/BackgroundJob/ExpireGroupVersions.php
+++ b/lib/BackgroundJob/ExpireGroupVersions.php
@@ -24,15 +24,21 @@
 
 namespace OCA\GroupFolders\BackgroundJob;
 
+use OCA\GroupFolders\AppInfo\Application;
+use OCA\GroupFolders\Folder\FolderManager;
 use OCA\GroupFolders\Versions\GroupVersionsExpireManager;
 use OCP\BackgroundJob\TimedJob;
 use OCP\AppFramework\Utility\ITimeFactory;
 
 class ExpireGroupVersions extends TimedJob {
-	private GroupVersionsExpireManager $expireManager;
-
-	public function __construct(GroupVersionsExpireManager $expireManager, ITimeFactory $timeFactory) {
-		parent::__construct($timeFactory);
+	public function __construct(
+		ITimeFactory $time,
+		private GroupVersionsExpireManager $expireManager,
+		private IConfig $config,
+		private FolderManager $folderManager,
+		private LoggerInterface $logger,
+	) {
+		parent::__construct($time);
 
 		// Run once per hour
 		$this->setInterval(60 * 60);
@@ -42,7 +48,42 @@ public function __construct(GroupVersionsExpireManager $expireManager, ITimeFact
 		$this->expireManager = $expireManager;
 	}
 
+	/**
+	 * Expiring groupfolder versions can be quite expensive.
+	 * We need to limit the amount of folders we expire per run.
+	 */
 	protected function run($argument) {
-		$this->expireManager->expireAll();
+		$lastFolder = (int)$this->config->getAppValue(Application::APP_ID, 'cron_last_folder_index', '0');
+		$folders = $this->folderManager->getAllFolders();
+
+		$folderCount = count($folders);
+		$currentRunHour = (int)date('G', $this->time->getTime());
+
+		// Calculate folders to process in the remaining hours, ensure at least one folder is processed
+		$toDo = max(1, (int)ceil(($folderCount - $lastFolder) / (24 - $currentRunHour)));
+
+		// If there are no folders, we don't need to do anything
+		if ($folderCount === 0) {
+			$this->logger->debug('No folders to expire', ['app' => 'cron']);
+			return;
+		}
+
+		// If we would go over the end of the list, wrap around
+		if ($lastFolder >= $folderCount) {
+			$lastFolder = 0;
+		}
+
+		// Save the updated folder index BEFORE processing the folders
+		$this->config->setAppValue(Application::APP_ID, 'cron_last_folder_index', (string)($lastFolder + $toDo));
+
+		// Determine the set of folders to process
+		$folderSet = array_slice($folders, $lastFolder, $toDo);
+		$folderIDs = array_map(function ($folder) {
+			return $folder['id'];
+		}, $folderSet);
+
+		// Log and start the expiration process
+		$this->logger->debug('Expiring versions for ' . count($folderSet) . ' folders', ['app' => 'cron', 'folders' => $folderIDs]);
+		$this->expireManager->expireFolders($folderSet);
 	}
 }
diff --git a/lib/Versions/GroupVersionsExpireManager.php b/lib/Versions/GroupVersionsExpireManager.php
index 05d452eaa..2947098b0 100644
--- a/lib/Versions/GroupVersionsExpireManager.php
+++ b/lib/Versions/GroupVersionsExpireManager.php
@@ -61,6 +61,13 @@ public function expireAll(): void {
 		}
 	}
 
+	public function expireFolders(array $folders): void {
+		foreach ($folders as $folder) {
+			$this->emit(self::class, 'enterFolder', [$folder]);
+			$this->expireFolder($folder);
+		}
+	}
+
 	/**
 	 * @param array{id: int, mount_point: string, groups: array<empty, empty>|array<array-key, int>, quota: int, size: int, acl: bool} $folder
 	 */