friendica/src/Core/BaseCache.php

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<?php
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/**
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* @copyright Copyright (C) 2010-2021, the Friendica project
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*
* @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 <https://www.gnu.org/licenses/>.
*
*/
namespace Friendica\Core;
use Friendica\Core\Cache\ICache;
/**
* Abstract class for common used functions
*/
abstract class BaseCache implements ICache
{
/**
* @var string The hostname
*/
private $hostName;
public function __construct(string $hostName)
{
$this->hostName = $hostName;
}
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/**
* Returns the prefix (to avoid namespace conflicts)
*
* @return string
* @throws \Exception
*/
protected function getPrefix()
{
// We fetch with the hostname as key to avoid problems with other applications
return $this->hostName;
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}
/**
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* @param string $key The original key
* @return string The cache key used for the cache
* @throws \Exception
*/
protected function getCacheKey($key)
{
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return $this->getPrefix() . ":" . $key;
}
/**
* @param array $keys A list of cached keys
* @return array A list of original keys
*/
protected function getOriginalKeys($keys)
{
if (empty($keys)) {
return [];
} else {
// Keys are prefixed with the node hostname, let's remove it
array_walk($keys, function (&$value) {
$value = preg_replace('/^' . $this->hostName . ':/', '', $value);
});
sort($keys);
return $keys;
}
}
/**
* Filters the keys of an array with a given prefix
* Returns the filtered keys as an new array
*
* @param array $keys The keys, which should get filtered
* @param string|null $prefix The prefix (if null, all keys will get returned)
*
* @return array The filtered array with just the keys
*/
protected function filterArrayKeysByPrefix(array $keys, string $prefix = null)
{
if (empty($prefix)) {
return $keys;
} else {
$result = [];
foreach ($keys as $key) {
if (strpos($key, $prefix) === 0) {
array_push($result, $key);
}
}
return $result;
}
}
}