Cache_redis: Adding serialization support.
diff --git a/system/libraries/Cache/drivers/Cache_redis.php b/system/libraries/Cache/drivers/Cache_redis.php
index 7a2b703..33a28de 100644
--- a/system/libraries/Cache/drivers/Cache_redis.php
+++ b/system/libraries/Cache/drivers/Cache_redis.php
@@ -38,6 +38,11 @@
class CI_Cache_redis extends CI_Driver
{
/**
+ * The name of the Redis set that is to store keys of serialized values.
+ */
+ const KEY_SET_FOR_SERIALIZATION = '_ci_redis_serialization_set';
+
+ /**
* Default config
*
* @static
@@ -58,6 +63,13 @@
*/
protected $_redis;
+ /**
+ * An internal cache for storing keys of serialized values.
+ *
+ * @var array
+ */
+ protected $_serialized;
+
// ------------------------------------------------------------------------
/**
@@ -68,7 +80,14 @@
*/
public function get($key)
{
- return $this->_redis->get($key);
+ $value = $this->_redis->get($key);
+
+ if ($value !== FALSE AND in_array($key, $this->_serialized))
+ {
+ return unserialize($value);
+ }
+
+ return $value;
}
// ------------------------------------------------------------------------
@@ -84,6 +103,27 @@
*/
public function save($id, $data, $ttl = 60, $raw = FALSE)
{
+ if (is_array($data) OR is_object($data))
+ {
+ $data = serialize($data);
+
+ if (($index_key = array_search($id, $this->_serialized)) === FALSE)
+ {
+ $this->_serialized[] = $id;
+ }
+
+ $this->_redis->sAdd(self::KEY_SET_FOR_SERIALIZATION, $id);
+ }
+ else
+ {
+ if (($index_key = array_search($id, $this->_serialized)) !== FALSE)
+ {
+ unset($this->_serialized[$index_key]);
+ }
+
+ $this->_redis->sRemove(self::KEY_SET_FOR_SERIALIZATION, $id);
+ }
+
return ($ttl)
? $this->_redis->setex($id, $ttl, $data)
: $this->_redis->set($id, $data);
@@ -99,6 +139,13 @@
*/
public function delete($key)
{
+ if (($index_key = array_search($key, $this->_serialized)) !== FALSE)
+ {
+ unset($this->_serialized[$index_key]);
+ }
+
+ $this->_redis->sRemove(self::KEY_SET_FOR_SERIALIZATION, $key);
+
return ($this->_redis->delete($key) === 1);
}
@@ -255,13 +302,21 @@
$this->_redis->auth($config['password']);
}
+ // Initialize the index of selialized values.
+ $this->_serialized = $this->_redis->sMembers(self::KEY_SET_FOR_SERIALIZATION);
+
+ if (empty($this->_serialized))
+ {
+ // On error FALSE is returned, ensure array type for empty index.
+ $this->_serialized = array();
+ }
+
return TRUE;
}
// ------------------------------------------------------------------------
/**
-
* Class destructor
*
* Closes the connection to Redis if present.