nextcloud/core/Command/Preview/Repair.php

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<?php
declare(strict_types=1);
/**
* @copyright Copyright (c) 2020, Morris Jobke <hey@morrisjobke.de>
*
* @author Christoph Wurst <christoph@winzerhof-wurst.at>
* @author Morris Jobke <hey@morrisjobke.de>
*
* @license GNU AGPL version 3 or any later version
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as
* published by the Free Software Foundation, either version 3 of the
* License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
namespace OC\Core\Command\Preview;
use bantu\IniGetWrapper\IniGetWrapper;
use OC\Preview\Storage\Root;
use OCP\Files\Folder;
use OCP\Files\IRootFolder;
use OCP\Files\NotFoundException;
use OCP\IConfig;
use OCP\ILogger;
use OCP\Lock\ILockingProvider;
use OCP\Lock\LockedException;
use Symfony\Component\Console\Command\Command;
use Symfony\Component\Console\Helper\ProgressBar;
use Symfony\Component\Console\Input\InputInterface;
use Symfony\Component\Console\Input\InputOption;
use Symfony\Component\Console\Output\OutputInterface;
use Symfony\Component\Console\Question\ConfirmationQuestion;
class Repair extends Command {
/** @var IConfig */
protected $config;
/** @var IRootFolder */
private $rootFolder;
/** @var ILogger */
private $logger;
/** @var bool */
private $stopSignalReceived = false;
/** @var int */
private $memoryLimit;
/** @var int */
private $memoryTreshold;
/** @var ILockingProvider */
private $lockingProvider;
public function __construct(IConfig $config, IRootFolder $rootFolder, ILogger $logger, IniGetWrapper $phpIni, ILockingProvider $lockingProvider) {
$this->config = $config;
$this->rootFolder = $rootFolder;
$this->logger = $logger;
$this->lockingProvider = $lockingProvider;
$this->memoryLimit = $phpIni->getBytes('memory_limit');
$this->memoryTreshold = $this->memoryLimit - 25 * 1024 * 1024;
parent::__construct();
}
protected function configure() {
$this
->setName('preview:repair')
->setDescription('distributes the existing previews into subfolders')
->addOption('batch', 'b', InputOption::VALUE_NONE, 'Batch mode - will not ask to start the migration and start it right away.')
->addOption('dry', 'd', InputOption::VALUE_NONE, 'Dry mode - will not create, move or delete any files - in combination with the verbose mode one could check the operations.');
}
protected function execute(InputInterface $input, OutputInterface $output): int {
if ($this->memoryLimit !== -1) {
$limitInMiB = round($this->memoryLimit / 1024 / 1024, 1);
$thresholdInMiB = round($this->memoryTreshold / 1024 / 1024, 1);
$output->writeln("Memory limit is $limitInMiB MiB");
$output->writeln("Memory threshold is $thresholdInMiB MiB");
$output->writeln("");
$memoryCheckEnabled = true;
} else {
$output->writeln("No memory limit in place - disabled memory check. Set a PHP memory limit to automatically stop the execution of this migration script once memory consumption is close to this limit.");
$output->writeln("");
$memoryCheckEnabled = false;
}
$dryMode = $input->getOption('dry');
if ($dryMode) {
$output->writeln("INFO: The migration is run in dry mode and will not modify anything.");
$output->writeln("");
}
$instanceId = $this->config->getSystemValueString('instanceid');
$output->writeln("This will migrate all previews from the old preview location to the new one.");
$output->writeln('');
$output->writeln('Fetching previews that need to be migrated …');
/** @var \OCP\Files\Folder $currentPreviewFolder */
$currentPreviewFolder = $this->rootFolder->get("appdata_$instanceId/preview");
$directoryListing = $currentPreviewFolder->getDirectoryListing();
$total = count($directoryListing);
/**
* by default there could be 0-9 a-f and the old-multibucket folder which are all fine
*/
if ($total < 18) {
$directoryListing = array_filter($directoryListing, function ($dir) {
if ($dir->getName() === 'old-multibucket') {
return false;
}
// a-f can't be a file ID -> removing from migration
if (preg_match('!^[a-f]$!', $dir->getName())) {
return false;
}
if (preg_match('!^[0-9]$!', $dir->getName())) {
// ignore folders that only has folders in them
if ($dir instanceof Folder) {
foreach ($dir->getDirectoryListing() as $entry) {
if (!$entry instanceof Folder) {
return true;
}
}
return false;
}
}
return true;
});
$total = count($directoryListing);
}
if ($total === 0) {
$output->writeln("All previews are already migrated.");
return 0;
}
$output->writeln("A total of $total preview files need to be migrated.");
$output->writeln("");
$output->writeln("The migration will always migrate all previews of a single file in a batch. After each batch the process can be canceled by pressing CTRL-C. This fill finish the current batch and then stop the migration. This migration can then just be started and it will continue.");
if ($input->getOption('batch')) {
$output->writeln('Batch mode active: migration is started right away.');
} else {
$helper = $this->getHelper('question');
$question = new ConfirmationQuestion('<info>Should the migration be started? (y/[n]) </info>', false);
if (!$helper->ask($input, $output, $question)) {
return 0;
}
}
// register the SIGINT listener late in here to be able to exit in the early process of this command
pcntl_signal(SIGINT, [$this, 'sigIntHandler']);
$output->writeln("");
$output->writeln("");
$section1 = $output->section();
$section2 = $output->section();
$progressBar = new ProgressBar($section2, $total);
$progressBar->setFormat("%current%/%max% [%bar%] %percent:3s%% %elapsed:6s%/%estimated:-6s% Used Memory: %memory:6s%");
$time = (new \DateTime())->format('H:i:s');
$progressBar->setMessage("$time Starting …");
$progressBar->maxSecondsBetweenRedraws(0.2);
$progressBar->start();
foreach ($directoryListing as $oldPreviewFolder) {
pcntl_signal_dispatch();
$name = $oldPreviewFolder->getName();
$time = (new \DateTime())->format('H:i:s');
$section1->writeln("$time Migrating previews of file with fileId $name");
$progressBar->display();
if ($this->stopSignalReceived) {
$section1->writeln("$time Stopping migration …");
return 0;
}
if (!$oldPreviewFolder instanceof Folder) {
$section1->writeln(" Skipping non-folder $name");
$progressBar->advance();
continue;
}
if ($name === 'old-multibucket') {
$section1->writeln(" Skipping fallback mount point $name");
$progressBar->advance();
continue;
}
if (in_array($name, ['a', 'b', 'c', 'd', 'e', 'f'])) {
$section1->writeln(" Skipping hex-digit folder $name");
$progressBar->advance();
continue;
}
if (!preg_match('!^\d+$!', $name)) {
$section1->writeln(" Skipping non-numeric folder $name");
$progressBar->advance();
continue;
}
$newFoldername = Root::getInternalFolder($name);
$memoryUsage = memory_get_usage();
if ($memoryCheckEnabled && $memoryUsage > $this->memoryTreshold) {
$section1->writeln("");
$section1->writeln("");
$section1->writeln("");
$section1->writeln(" Stopped process 25 MB before reaching the memory limit to avoid a hard crash.");
$time = (new \DateTime())->format('H:i:s');
$section1->writeln("$time Reached memory limit and stopped to avoid hard crash.");
return 1;
}
$lockName = 'occ preview:repair lock ' . $oldPreviewFolder->getId();
try {
$section1->writeln(" Locking \"$lockName\" ", OutputInterface::VERBOSITY_VERBOSE);
$this->lockingProvider->acquireLock($lockName, ILockingProvider::LOCK_EXCLUSIVE);
} catch (LockedException $e) {
$section1->writeln(" Skipping because it is locked - another process seems to work on this …");
continue;
}
$previews = $oldPreviewFolder->getDirectoryListing();
if ($previews !== []) {
try {
$this->rootFolder->get("appdata_$instanceId/preview/$newFoldername");
} catch (NotFoundException $e) {
$section1->writeln(" Create folder preview/$newFoldername", OutputInterface::VERBOSITY_VERBOSE);
if (!$dryMode) {
$this->rootFolder->newFolder("appdata_$instanceId/preview/$newFoldername");
}
}
foreach ($previews as $preview) {
pcntl_signal_dispatch();
$previewName = $preview->getName();
if ($preview instanceof Folder) {
$section1->writeln(" Skipping folder $name/$previewName");
$progressBar->advance();
continue;
}
$section1->writeln(" Move preview/$name/$previewName to preview/$newFoldername", OutputInterface::VERBOSITY_VERBOSE);
if (!$dryMode) {
try {
$preview->move("appdata_$instanceId/preview/$newFoldername/$previewName");
} catch (\Exception $e) {
$this->logger->logException($e, ['app' => 'core', 'message' => "Failed to move preview from preview/$name/$previewName to preview/$newFoldername"]);
}
}
}
}
if ($oldPreviewFolder->getDirectoryListing() === []) {
$section1->writeln(" Delete empty folder preview/$name", OutputInterface::VERBOSITY_VERBOSE);
if (!$dryMode) {
try {
$oldPreviewFolder->delete();
} catch (\Exception $e) {
$this->logger->logException($e, ['app' => 'core', 'message' => "Failed to delete empty folder preview/$name"]);
}
}
}
$this->lockingProvider->releaseLock($lockName, ILockingProvider::LOCK_EXCLUSIVE);
$section1->writeln(" Unlocked", OutputInterface::VERBOSITY_VERBOSE);
$section1->writeln(" Finished migrating previews of file with fileId $name");
$progressBar->advance();
}
$progressBar->finish();
$output->writeln("");
return 0;
}
protected function sigIntHandler() {
echo "\nSignal received - will finish the step and then stop the migration.\n\n\n";
$this->stopSignalReceived = true;
}
}