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<?php
namespace Shaarli\Render;
use DatePeriod;
use Shaarli\Feed\CachedPage;
/**
* Cache utilities
*/
class PageCacheManager
{
/** @var string Cache directory */
protected $pageCacheDir;
/** @var bool */
protected $isLoggedIn;
public function __construct(string $pageCacheDir, bool $isLoggedIn)
{
$this->pageCacheDir = $pageCacheDir;
$this->isLoggedIn = $isLoggedIn;
}
/**
* Purges all cached pages
*
* @return string|null an error string if the directory is missing
*/
public function purgeCachedPages(): ?string
{
if (!is_dir($this->pageCacheDir)) {
$error = sprintf(t('Cannot purge %s: no directory'), $this->pageCacheDir);
error_log($error);
return $error;
}
array_map('unlink', glob($this->pageCacheDir . '/*.cache'));
return null;
}
/**
* Invalidates caches when the database is changed or the user logs out.
*/
public function invalidateCaches(): void
{
// Purge page cache shared by sessions.
$this->purgeCachedPages();
}
/**
* Get CachedPage instance for provided URL.
*
* @param string $pageUrl
* @param ?DatePeriod $validityPeriod Optionally specify a time limit on requested cache
*
* @return CachedPage
*/
public function getCachePage(string $pageUrl, DatePeriod $validityPeriod = null): CachedPage
{
return new CachedPage(
$this->pageCacheDir,
$pageUrl,
false === $this->isLoggedIn,
$validityPeriod
);
}
}
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