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<?php |
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/** |
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* Memcache handler for searching by key substring |
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* |
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* @file MemcachedAdapter.php |
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* |
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* PHP version 8.0+ |
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* |
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* @author Alexander Yancharuk <alex at itvault dot info> |
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* @copyright © 2012-2021 Alexander Yancharuk |
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* @date Птн Ноя 01 17:52:46 2013 |
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* @license The BSD 3-Clause License |
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* <https://tldrlegal.com/license/bsd-3-clause-license-(revised)> |
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*/ |
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namespace Veles\Cache\Adapters; |
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use Exception; |
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/** |
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* Class for key cleanup by prefix |
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* |
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* In memcache and memcached drivers not implemented key deletion by |
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* template, this is the reason why this class have implementation of |
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* key deletion through socket connection. |
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* Can be used with Memcache only. |
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*/ |
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class MemcacheRaw |
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{ |
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protected static $host; |
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protected static $port; |
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/** |
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* @var resource |
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*/ |
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protected $connection; |
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protected $regex = '/^(?:END|DELETED|NOT_FOUND|OK|ERROR|STORED|NOT_STORED|EXISTS|TOUCHED)\s+$/'; |
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/** |
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* Constructor. Open connection with Memcache server. |
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* |
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* @throws Exception |
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*/ |
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public function __construct() |
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{ |
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$errno = $errstr = null; |
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try { |
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$this->connection = fsockopen( |
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self::$host, self::$port, $errno, $errstr |
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); |
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} catch (Exception $e) { |
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throw new Exception( |
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'Can not connect to Memcache. Host: ' . self::$host . ' Port: ' . self::$port |
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); |
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} |
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} |
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/** |
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* Save connection params |
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* |
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* @param string $host |
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* @param int $port |
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*/ |
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public static function setConnectionParams($host, $port) |
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{ |
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self::$host = $host; |
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self::$port = $port; |
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} |
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/** |
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* Close memcache connection |
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* |
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* @return bool |
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*/ |
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public function disconnect() |
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{ |
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$this->command('quit'); |
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return fclose($this->connection); |
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} |
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/** |
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* Run memcache console command |
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* |
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* @param string $command Internal console memcache command |
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* |
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* @return bool|string Returns string or false on failure or empty result |
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*/ |
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public function command($command) |
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{ |
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fwrite($this->connection, $command . PHP_EOL); |
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return fgets($this->connection); |
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} |
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/** |
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* Method for deletion keys by template |
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* |
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* ATTENTION: if key contains spaces, for example 'THIS IS KEY::ID:50d98ld', |
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* then in cache it will be saved as 'THIS_IS_KEY::ID:50d98ld'. So, template |
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* for that key deletion must be look like - 'THIS_IS_KEY'. |
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* Deletion can be made by substring, containing in keys. For example |
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* '_KEY::ID'. |
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* |
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* @param string $tpl Substring containing in needed keys |
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* @return MemcacheRaw |
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*/ |
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public function delByTemplate($tpl) |
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{ |
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$output = $this->query('stats items'); |
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$lines = explode("\r\n", trim($output)); |
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$slabs = $this->getSlabs($lines); |
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unset($lines); |
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foreach ($slabs as $slab) { |
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$query = "stats cachedump $slab"; |
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$output = $this->query($query); |
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if (preg_match_all('/ITEM ([^\s]+)/', $output, $match)) { |
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$this->delete($match[1], $tpl); |
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} |
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} |
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unset($output, $slabs, $slab, $match); |
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return $this; |
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} |
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/** |
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* Run console command with output returning |
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* |
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* @param string $command Memcache console internal command |
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* |
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* @return string |
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*/ |
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public function query($command) |
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{ |
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fwrite($this->connection, $command . PHP_EOL); |
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$output = ''; |
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while (false !== ($str = fgets($this->connection))) { |
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if (1 === preg_match($this->regex, $str)) { |
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break; |
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} |
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$output .= $str; |
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} |
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return $output; |
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} |
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/** |
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* Get slabs array |
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* |
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* @param $lines |
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* |
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* @return array |
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*/ |
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3 |
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protected function getSlabs($lines) |
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{ |
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$regex_items = '/^STAT items:(\d+):number (\d+)$/'; |
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3 |
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$slabs = []; |
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3 |
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foreach ($lines as $line) { |
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if (1 === preg_match($regex_items, $line, $match)) { |
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$slabs[] = "$match[1] $match[2]"; |
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} |
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} |
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return $slabs; |
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} |
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/** |
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* Send delete matched keys from cache |
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* |
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* @param $match |
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* @param $tpl |
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*/ |
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2 |
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protected function delete($match, $tpl) |
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{ |
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foreach ($match as $key) { |
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if (false === strpos($key, $tpl)) { |
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continue; |
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} |
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1 |
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$this->command("delete $key"); |
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} |
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} |
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} |
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nafigator /
Veles
