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264 lines (242 loc) · 6.78 KB
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<?php
namespace Jamm\Memory;
class RedisObject extends MemoryObject implements IMemoryStorage
{
const lock_key_prefix = '.lock_key.';
const tag_prefix = '.tag.';
/** @var IRedisServer */
protected $redis;
protected $prefix;
protected $tag_prefix;
protected $lock_key_prefix;
public function __construct($prefix = 'K', IRedisServer $RedisServer = NULL)
{
$this->prefix = str_replace('.', '_', $prefix).'.';
if (!empty($RedisServer)) $this->redis = $RedisServer;
else $this->setDefaultRedisServer();
$this->tag_prefix = self::tag_prefix.$this->prefix;
$this->lock_key_prefix = self::lock_key_prefix.$this->prefix;
}
protected function setDefaultRedisServer()
{
$this->redis = new RedisServer();
}
/**
* Add value to the memory storage, only if this key does not exists (or false will be returned).
*
* @param string $k
* @param mixed $v
* @param int $ttl
* @param array|string $tags
* @return boolean
*/
public function add($k, $v, $ttl = 259200, $tags = NULL)
{
$key = $this->prefix.$k;
$set = $this->redis->SetNX($key, serialize($v));
if (!$set) return false;
$ttl = intval($ttl);
if ($ttl < 1) $ttl = self::max_ttl;
$this->redis->Expire($key, $ttl);
if (!empty($tags)) $this->setTags($k, $tags);
return true;
}
/**
* Set tags, associated with the key
*
* @param string $key
* @param string|array $tags
* @return bool
*/
public function setTags($key, $tags)
{
if (!is_array($tags)) $tags = array($tags);
foreach ($tags as $tag)
{
if (!$this->redis->sAdd($this->tag_prefix.$tag, $key)) return false;
}
return true;
}
/**
* Save variable in memory storage
*
* @param string $k - key
* @param mixed $v - value
* @param int $ttl - time to live (store) in seconds
* @param array|string $tags - array of tags for this key
* @return bool
*/
public function save($k, $v, $ttl = 259200, $tags = NULL)
{
$ttl = intval($ttl);
if ($ttl < 1) $ttl = self::max_ttl;
$set = $this->redis->SetEX($this->prefix.$k, $ttl, serialize($v));
if (!$set) return false;
if (!empty($tags)) $this->setTags($k, $tags);
return true;
}
/**
* Read data from memory storage
*
* @param string|array $k (string or array of string keys)
* @param mixed $ttl_left = (ttl - time()) of key. Use to exclude dog-pile effect, with lock/unlock_key methods.
* @return mixed
*/
public function read($k, &$ttl_left = -1)
{
$r = unserialize($this->redis->get($this->prefix.$k));
if ($r===false) return false;
if ($ttl_left!==-1)
{
$ttl_left = $this->redis->TTL($this->prefix.$k);
if ($ttl_left < 1) $ttl_left = self::max_ttl;
}
return $r;
}
/**
* Delete key or array of keys from storage
* @param string|array $k - keys
* @return boolean|array - if array of keys was passed, on error will be returned array of not deleted keys, or 'true' on success.
*/
public function del($k)
{
if (!is_array($k)) $k = array($k);
$todel = array();
$tags = $this->redis->Keys($this->tag_prefix.'*');
foreach ($k as $key)
{
$todel[] = $this->prefix.$key;
foreach ($tags as $tag) $this->redis->sRem($tag, $key);
}
return $this->redis->Del($todel);
}
public function del_old()
{
//should be automatically done by Redis
return true;
}
/**
* Delete keys by tags
*
* @param array|string $tag - tag or array of tags
* @return boolean
*/
public function del_by_tags($tag)
{
if (!is_array($tag)) $tag = array($tag);
$d = 0;
foreach ($tag as $t)
{
$keys = $this->redis->sMembers($this->tag_prefix.$t);
if (!empty($keys)) $d += $this->del($keys);
$this->redis->Del($this->tag_prefix.$t);
}
return $d;
}
/**
* Select from storage via callback function
* Only values of 'array' type will be selected
* @param callback $fx ($value_array,$key)
* @param bool $get_array
* @return mixed
*/
public function select_fx($fx, $get_array = false)
{
$arr = array();
$l = strlen($this->prefix);
$keys = $this->redis->Keys($this->prefix.'*');
foreach ($keys as $key)
{
$s = unserialize($this->redis->Get($key));
if (!is_array($s)) continue;
$index = substr($key, $l);
if ($fx($s, $index)===true)
{
if (!$get_array) return $s;
else $arr[$index] = $s;
}
}
if (!$get_array || empty($arr)) return false;
else return $arr;
}
/**
* Increment value of key
* @param string $key
* @param mixed $by_value
* if stored value is array:
* if $by_value is value in array, new element will be pushed to the end of array,
* if $by_value is key=>value array, key=>value pair will be added (or updated)
* @param int $limit_keys_count - maximum count of elements (used only if stored value is array)
* @return int|string|array new value of key
*/
public function increment($key, $by_value = 1, $limit_keys_count = 0)
{
if (empty($key))
{
$this->ReportError('empty keys are not allowed', __LINE__);
return false;
}
$value = $this->read($key);
if ($value===null || $value===false) return $this->save($key, $by_value);
if (is_numeric($value)) $value += $by_value;
elseif (is_array($value))
{
if ($limit_keys_count > 0 && (count($value) > $limit_keys_count)) $value = array_slice($value, $limit_keys_count*(-1)+1);
if (is_array($by_value))
{
$set_key = key($by_value);
if (!empty($set_key)) $value[$set_key] = $by_value[$set_key];
else $value[] = $by_value[0];
}
else $value[] = $by_value;
}
else $value .= $by_value;
if ($this->save($key, $value)) return $value;
else return false;
}
/**
* Get exclusive mutex for key. Key will be still accessible to read and write, but
* another process can exclude dog-pile effect, if before updating the key he will try to get this mutex.
* @param mixed $key
* @param mixed $auto_unlocker_variable - pass empty, just declared variable
*/
public function lock_key($key, &$auto_unlocker_variable)
{
$r = $this->redis->SetNX($this->lock_key_prefix.$key, 1);
if (!$r) return false;
$this->redis->Expire($this->lock_key_prefix.$key, self::key_lock_time);
$auto_unlocker_variable = new KeyAutoUnlocker(array($this, 'unlock_key'));
$auto_unlocker_variable->key = $key;
return true;
}
/**
* Unlock key, locked by method 'lock_key'
* @param KeyAutoUnlocker $auto_unlocker
* @return bool
*/
public function unlock_key(KeyAutoUnlocker $auto_unlocker)
{
if (empty($auto_unlocker->key))
{
$this->ReportError('autoUnlocker should be passed', __LINE__);
return false;
}
$auto_unlocker->revoke();
return $this->redis->Del($this->lock_key_prefix.$auto_unlocker->key);
}
/**
* @return array
*/
public function get_stat()
{
return $this->redis->info();
}
/** Return array of all stored keys */
public function get_keys()
{
$l = strlen($this->prefix);
$keys = $this->redis->Keys($this->prefix.'*');
foreach ($keys as &$key) $key = substr($key, $l);
return $keys;
}
}