events/Classes/Caching/PageCacheTimeout.php

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<?php
declare(strict_types=1);
/*
* Copyright (C) 2023 Daniel Siepmann <coding@daniel-siepmann.de>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301, USA.
*/
namespace WerkraumMedia\Events\Caching;
use DateTime;
use DateTimeImmutable;
use InvalidArgumentException;
use TYPO3\CMS\Core\Cache\CacheManager;
use TYPO3\CMS\Core\Cache\Frontend\FrontendInterface;
use TYPO3\CMS\Core\Context\Context;
use TYPO3\CMS\Core\SingletonInterface;
use WerkraumMedia\Events\Domain\Model\Date;
use WerkraumMedia\Events\Events\Controller\DateListVariables;
/**
* Teaches TYPO3 to set proper timeout for page cache.
*
* Takes timings of rendered dates into account.
* Reduced timeout of page cache in case events (dates) might change before already calculated timeout.
*/
class PageCacheTimeout implements SingletonInterface
{
/**
* @var DateTimeImmutable|null
*/
private $timeout;
/**
* @var FrontendInterface
*/
private $runtimeCache;
/**
* @var Context
*/
private $context;
public function __construct(
CacheManager $cacheManager,
Context $context
) {
$this->runtimeCache = $cacheManager->getCache('runtime');
$this->context = $context;
}
public function calculateCacheTimout(
array $parameters
): int {
$typo3Timeout = $parameters['cacheTimeout'];
$ourTimeout = $this->getTimeout();
if ($ourTimeout === null) {
return $typo3Timeout;
}
return min($typo3Timeout, $ourTimeout);
}
public function trackDates(DateListVariables $event): void
{
if ($event->getDemand()->shouldShowFromMidnight()) {
$this->updateTimeout(new DateTimeImmutable('tomorrow midnight'));
return;
}
if ($event->getDemand()->shouldShowUpcoming()) {
$this->trackTimeoutByDate($event, static function (Date $date) {
return $date->getStart();
});
}
$this->trackTimeoutByDate($event, static function (Date $date) {
return $date->getEnd();
});
}
/**
* @param callable $callback Receives Date as argument and should return DateTime to use as potential timeout.
*/
private function trackTimeoutByDate(
DateListVariables $event,
callable $callback
): void {
foreach ($event->getDates() as $date) {
$date = $callback($date);
if (!$date instanceof DateTime) {
continue;
}
$this->updateTimeout(DateTimeImmutable::createFromMutable($date));
}
}
private function updateTimeout(DateTimeImmutable $newTimeout): void
{
$now = $this->getExecution();
if (
$newTimeout <= $now
|| (
$this->timeout instanceof DateTimeImmutable
&& $this->timeout <= $newTimeout
)
) {
return;
}
$this->runtimeCache->remove('core-tslib_fe-get_cache_timeout');
$this->timeout = $newTimeout;
}
private function getTimeout(): ?int
{
if (!$this->timeout instanceof DateTimeImmutable) {
return null;
}
return ((int)$this->timeout->format('U')) - ((int)$this->getExecution()->format('U'));
}
private function getExecution(): DateTimeImmutable
{
$execution = $this->context->getPropertyFromAspect('date', 'full');
if (!$execution instanceof DateTimeImmutable) {
throw new InvalidArgumentException('Could not fetch DateTimeImmutable from context.', 1684740576);
}
return $execution;
}
public static function register(): void
{
$GLOBALS['TYPO3_CONF_VARS']['SC_OPTIONS']['tslib/class.tslib_fe.php']['get_cache_timeout']['events'] = self::class . '->calculateCacheTimout';
}
}