3 namespace Friendica\Core\Cache;
5 use Friendica\BaseObject;
6 use Friendica\Core\Cache;
9 * Redis Cache Driver. This driver is based on Memcache driver
11 * @author Hypolite Petovan <mrpetovan@gmail.com>
12 * @author Roland Haeder <roland@mxchange.org>
14 class RedisCacheDriver extends BaseObject implements IMemoryCacheDriver
21 public function __construct($redis_host, $redis_port)
23 if (!class_exists('Redis', false)) {
24 throw new \Exception('Redis class isn\'t available');
27 $this->redis = new \Redis();
29 if (!$this->redis->connect($redis_host, $redis_port)) {
30 throw new \Exception('Expected Redis server at ' . $redis_host . ':' . $redis_port . ' isn\'t available');
34 public function get($key)
38 // We fetch with the hostname as key to avoid problems with other applications
39 $cached = $this->redis->get(self::getApp()->get_hostname() . ':' . $key);
41 // @see http://php.net/manual/en/redis.get.php#84275
42 if (is_bool($cached) || is_double($cached) || is_long($cached)) {
46 $value = @unserialize($cached);
48 // Only return a value if the serialized value is valid.
49 // We also check if the db entry is a serialized
50 // boolean 'false' value (which we want to return).
51 if ($cached === serialize(false) || $value !== false) {
58 public function set($key, $value, $ttl = Cache::FIVE_MINUTES)
60 // We store with the hostname as key to avoid problems with other applications
62 return $this->redis->setex(
63 self::getApp()->get_hostname() . ":" . $key,
68 return $this->redis->set(
69 self::getApp()->get_hostname() . ":" . $key,
75 public function delete($key)
77 return $this->redis->delete($key);
80 public function clear()
87 * @brief Sets a value if it's not already stored
89 * @param string $key The cache key
90 * @param mixed $value The old value we know from the cache
91 * @param int $ttl The cache lifespan, must be one of the Cache constants
94 public function add($key, $value, $ttl = Cache::FIVE_MINUTES)
96 if (!is_int($value)) {
97 $value = serialize($value);
100 return $this->redis->setnx(self::getApp()->get_hostname() . ":" . $key, $value);
104 * @brief Compares if the old value is set and sets the new value
106 * @param string $key The cache key
107 * @param mixed $oldValue The old value we know
108 * @param mixed $newValue The new value we want to set
109 * @param int $ttl The cache lifespan, must be one of the Cache constants
112 public function compareSet($key, $oldValue, $newValue, $ttl = Cache::FIVE_MINUTES)
114 if (!is_int($newValue)) {
115 $newValue = serialize($newValue);
118 $this->redis->watch(self::getApp()->get_hostname() . ":" . $key);
119 // If the old value isn't what we expected, somebody else changed the key meanwhile
120 if ($this->get($key) === $oldValue) {
122 $result = $this->redis->multi()
123 ->setex(self::getApp()->get_hostname() . ":" . $ttl, $key, $newValue)
126 $result = $this->redis->multi()
127 ->set(self::getApp()->get_hostname() . ":" . $key, $newValue)
130 return $result !== false;
132 $this->redis->unwatch();
136 * @brief Compares if the old value is set and removes it
138 * @param string $key The cache key
139 * @param mixed $value The old value we know and want to delete
142 public function compareDelete($key, $value)
144 $this->redis->watch(self::getApp()->get_hostname() . ":" . $key);
145 // If the old value isn't what we expected, somebody else changed the key meanwhile
146 if ($this->get($key) === $value) {
147 $result = $this->redis->multi()
148 ->del(self::getApp()->get_hostname() . ":" . $key)
150 return $result !== false;
152 $this->redis->unwatch();