146 lines
3.0 KiB
PHP
146 lines
3.0 KiB
PHP
<?php
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namespace Friendica\Core\Cache;
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use Friendica\Core\Cache;
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/**
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* Redis Cache Driver. This driver is based on Memcache driver
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*
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* @author Hypolite Petovan <mrpetovan@gmail.com>
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* @author Roland Haeder <roland@mxchange.org>
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*/
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class RedisCacheDriver extends AbstractCacheDriver implements IMemoryCacheDriver
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{
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/**
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* @var \Redis
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*/
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private $redis;
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public function __construct($redis_host, $redis_port)
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{
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if (!class_exists('Redis', false)) {
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throw new \Exception('Redis class isn\'t available');
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}
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$this->redis = new \Redis();
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if (!$this->redis->connect($redis_host, $redis_port)) {
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throw new \Exception('Expected Redis server at ' . $redis_host . ':' . $redis_port . ' isn\'t available');
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}
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}
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public function get($key)
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{
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$return = null;
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$cachekey = $this->getCacheKey($key);
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$cached = $this->redis->get($cachekey);
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if ($cached === false && !$this->redis->exists($cachekey)) {
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return null;
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}
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$value = json_decode($cached);
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// Only return a value if the serialized value is valid.
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// We also check if the db entry is a serialized
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// boolean 'false' value (which we want to return).
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if ($cached === serialize(false) || $value !== false) {
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$return = $value;
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}
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return $return;
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}
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public function set($key, $value, $ttl = Cache::FIVE_MINUTES)
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{
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$cachekey = $this->getCacheKey($key);
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$cached = json_encode($value);
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if ($ttl > 0) {
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return $this->redis->setex(
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$cachekey,
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$ttl,
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$cached
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);
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} else {
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return $this->redis->set(
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$cachekey,
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$cached
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);
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}
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}
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public function delete($key)
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{
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$cachekey = $this->getCacheKey($key);
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return ($this->redis->delete($cachekey) > 0);
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}
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public function clear($outdated = true)
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{
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if ($outdated) {
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return true;
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} else {
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return $this->redis->flushAll();
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}
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}
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/**
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* (@inheritdoc)
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*/
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public function add($key, $value, $ttl = Cache::FIVE_MINUTES)
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{
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$cachekey = $this->getCacheKey($key);
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$cached = json_encode($value);
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return $this->redis->setnx($cachekey, $cached);
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}
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/**
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* (@inheritdoc)
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*/
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public function compareSet($key, $oldValue, $newValue, $ttl = Cache::FIVE_MINUTES)
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{
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$cachekey = $this->getCacheKey($key);
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$newCached = json_encode($newValue);
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$this->redis->watch($cachekey);
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// If the old value isn't what we expected, somebody else changed the key meanwhile
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if ($this->get($key) === $oldValue) {
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if ($ttl > 0) {
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$result = $this->redis->multi()
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->setex($cachekey, $ttl, $newCached)
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->exec();
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} else {
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$result = $this->redis->multi()
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->set($cachekey, $newValue)
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->exec();
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}
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return $result !== false;
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}
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$this->redis->unwatch();
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return false;
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}
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/**
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* (@inheritdoc)
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*/
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public function compareDelete($key, $value)
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{
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$cachekey = $this->getCacheKey($key);
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$this->redis->watch($cachekey);
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// If the old value isn't what we expected, somebody else changed the key meanwhile
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if ($this->get($key) === $value) {
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$result = $this->redis->multi()
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->del($cachekey)
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->exec();
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return $result !== false;
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}
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$this->redis->unwatch();
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return false;
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}
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}
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