friendica/src/Core/Cache/RedisCacheDriver.php

141 lines
3.3 KiB
PHP

<?php
namespace Friendica\Core\Cache;
use Friendica\BaseObject;
use Friendica\Core\Cache;
/**
* Redis Cache Driver. This driver is based on Memcache driver
*
* @author Hypolite Petovan <mrpetovan@gmail.com>
* @author Roland Haeder <roland@mxchange.org>
*/
class RedisCacheDriver extends BaseObject implements IMemoryCacheDriver
{
/**
* @var Redis
*/
private $redis;
public function __construct($redis_host, $redis_port)
{
if (!class_exists('Redis', false)) {
throw new \Exception('Redis class isn\'t available');
}
$this->redis = new \Redis();
if (!$this->redis->connect($redis_host, $redis_port)) {
throw new \Exception('Expected Redis server at ' . $redis_host . ':' . $redis_port . ' isn\'t available');
}
}
public function get($key)
{
$return = null;
// We fetch with the hostname as key to avoid problems with other applications
$cached = $this->redis->get(self::getApp()->get_hostname() . ':' . $key);
// @see http://php.net/manual/en/redis.get.php#84275
if (is_bool($cached) || is_double($cached) || is_long($cached)) {
return $return;
}
$value = @unserialize($cached);
// Only return a value if the serialized value is valid.
// We also check if the db entry is a serialized
// boolean 'false' value (which we want to return).
if ($cached === serialize(false) || $value !== false) {
$return = $value;
}
return $return;
}
public function set($key, $value, $ttl = Cache::FIVE_MINUTES)
{
// We store with the hostname as key to avoid problems with other applications
if ($ttl > 0) {
return $this->redis->setex(
self::getApp()->get_hostname() . ":" . $key,
time() + $ttl,
serialize($value)
);
} else {
return $this->redis->set(
self::getApp()->get_hostname() . ":" . $key,
serialize($value)
);
}
}
public function delete($key)
{
return $this->redis->delete($key);
}
public function clear()
{
return true;
}
/**
* (@inheritdoc)
*/
public function add($key, $value, $ttl = Cache::FIVE_MINUTES)
{
if (!is_int($value)) {
$value = serialize($value);
}
return $this->redis->setnx(self::getApp()->get_hostname() . ":" . $key, $value);
}
/**
* (@inheritdoc)
*/
public function compareSet($key, $oldValue, $newValue, $ttl = Cache::FIVE_MINUTES)
{
if (!is_int($newValue)) {
$newValue = serialize($newValue);
}
$this->redis->watch(self::getApp()->get_hostname() . ":" . $key);
// If the old value isn't what we expected, somebody else changed the key meanwhile
if ($this->get($key) === $oldValue) {
if ($ttl > 0) {
$result = $this->redis->multi()
->setex(self::getApp()->get_hostname() . ":" . $ttl, $key, $newValue)
->exec();
} else {
$result = $this->redis->multi()
->set(self::getApp()->get_hostname() . ":" . $key, $newValue)
->exec();
}
return $result !== false;
}
$this->redis->unwatch();
return false;
}
/**
* (@inheritdoc)
*/
public function compareDelete($key, $value)
{
$this->redis->watch(self::getApp()->get_hostname() . ":" . $key);
// If the old value isn't what we expected, somebody else changed the key meanwhile
if ($this->get($key) === $value) {
$result = $this->redis->multi()
->del(self::getApp()->get_hostname() . ":" . $key)
->exec();
return $result !== false;
}
$this->redis->unwatch();
return false;
}
}