paulgoughbooks_old
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<?php /** * CodeIgniter * * An open source application development framework for PHP * * This content is released under the MIT License (MIT) * * Copyright (c) 2014-2019 British Columbia Institute of Technology * Copyright (c) 2019-2020 CodeIgniter Foundation * * Permission is hereby granted, free of charge, to any person obtaining a copy * of this software and associated documentation files (the "Software"), to deal * in the Software without restriction, including without limitation the rights * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell * copies of the Software, and to permit persons to whom the Software is * furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice shall be included in * all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN * THE SOFTWARE. * * @package CodeIgniter * @author CodeIgniter Dev Team * @copyright 2019-2020 CodeIgniter Foundation * @license https://opensource.org/licenses/MIT MIT License * @link https://codeigniter.com * @since Version 4.0.0 * @filesource */ namespace CodeIgniter\Cache\Handlers; use CodeIgniter\Cache\CacheInterface; use CodeIgniter\Exceptions\CriticalError; /** * Mamcached cache handler */ class MemcachedHandler implements CacheInterface { /** * Prefixed to all cache names. * * @var string */ protected $prefix; /** * The memcached object * * @var \Memcached|\Memcache */ protected $memcached; /** * Memcached Configuration * * @var array */ protected $config = [ 'host' => '127.0.0.1', 'port' => 11211, 'weight' => 1, 'raw' => false, ]; //-------------------------------------------------------------------- /** * Constructor. * * @param \Config\Cache $config */ public function __construct($config) { $this->prefix = $config->prefix ?: ''; if (! empty($config)) { $this->config = array_merge($this->config, $config->memcached); } } /** * Class destructor * * Closes the connection to Memcache(d) if present. */ public function __destruct() { if ($this->memcached instanceof \Memcached) { $this->memcached->quit(); } elseif ($this->memcached instanceof \Memcache) { $this->memcached->close(); } } //-------------------------------------------------------------------- /** * Takes care of any handler-specific setup that must be done. */ public function initialize() { // Try to connect to Memcache or Memcached, if an issue occurs throw a CriticalError exception, // so that the CacheFactory can attempt to initiate the next cache handler. try { if (class_exists('\Memcached')) { // Create new instance of \Memcached $this->memcached = new \Memcached(); if ($this->config['raw']) { $this->memcached->setOption(\Memcached::OPT_BINARY_PROTOCOL, true); } // Add server $this->memcached->addServer( $this->config['host'], $this->config['port'], $this->config['weight'] ); // attempt to get status of servers $stats = $this->memcached->getStats(); // $stats should be an associate array with a key in the format of host:port. // If it doesn't have the key, we know the server is not working as expected. if (! isset($stats[$this->config['host'] . ':' . $this->config['port']])) { throw new CriticalError('Cache: Memcached connection failed.'); } } elseif (class_exists('\Memcache')) { // Create new instance of \Memcache $this->memcached = new \Memcache(); // Check if we can connect to the server $can_connect = $this->memcached->connect( $this->config['host'], $this->config['port'] ); // If we can't connect, throw a CriticalError exception if ($can_connect === false) { throw new CriticalError('Cache: Memcache connection failed.'); } // Add server, third parameter is persistence and defaults to TRUE. $this->memcached->addServer( $this->config['host'], $this->config['port'], true, $this->config['weight'] ); } else { throw new CriticalError('Cache: Not support Memcache(d) extension.'); } } catch (CriticalError $e) { // If a CriticalError exception occurs, throw it up. throw $e; } catch (\Exception $e) { // If an \Exception occurs, convert it into a CriticalError exception and throw it. throw new CriticalError('Cache: Memcache(d) connection refused (' . $e->getMessage() . ').'); } } //-------------------------------------------------------------------- /** * Attempts to fetch an item from the cache store. * * @param string $key Cache item name * * @return mixed */ public function get(string $key) { $key = $this->prefix . $key; if ($this->memcached instanceof \Memcached) { $data = $this->memcached->get($key); // check for unmatched key if ($this->memcached->getResultCode() === \Memcached::RES_NOTFOUND) { return null; } } elseif ($this->memcached instanceof \Memcache) { $flags = false; $data = $this->memcached->get($key, $flags); // check for unmatched key (i.e. $flags is untouched) if ($flags === false) { return null; } } return is_array($data) ? $data[0] : $data; } //-------------------------------------------------------------------- /** * Saves an item to the cache store. * * @param string $key Cache item name * @param mixed $value The data to save * @param integer $ttl Time To Live, in seconds (default 60) * * @return mixed */ public function save(string $key, $value, int $ttl = 60) { $key = $this->prefix . $key; if (! $this->config['raw']) { $value = [ $value, time(), $ttl, ]; } if ($this->memcached instanceof \Memcached) { return $this->memcached->set($key, $value, $ttl); } if ($this->memcached instanceof \Memcache) { return $this->memcached->set($key, $value, 0, $ttl); } return false; } //-------------------------------------------------------------------- /** * Deletes a specific item from the cache store. * * @param string $key Cache item name * * @return boolean */ public function delete(string $key) { $key = $this->prefix . $key; return $this->memcached->delete($key); } //-------------------------------------------------------------------- /** * Performs atomic incrementation of a raw stored value. * * @param string $key Cache ID * @param integer $offset Step/value to increase by * * @return mixed */ public function increment(string $key, int $offset = 1) { if (! $this->config['raw']) { return false; } $key = $this->prefix . $key; return $this->memcached->increment($key, $offset, $offset, 60); } //-------------------------------------------------------------------- /** * Performs atomic decrementation of a raw stored value. * * @param string $key Cache ID * @param integer $offset Step/value to increase by * * @return mixed */ public function decrement(string $key, int $offset = 1) { if (! $this->config['raw']) { return false; } $key = $this->prefix . $key; //FIXME: third parameter isn't other handler actions. return $this->memcached->decrement($key, $offset, $offset, 60); } //-------------------------------------------------------------------- /** * Will delete all items in the entire cache. * * @return boolean */ public function clean() { return $this->memcached->flush(); } //-------------------------------------------------------------------- /** * Returns information on the entire cache. * * The information returned and the structure of the data * varies depending on the handler. * * @return mixed */ public function getCacheInfo() { return $this->memcached->getStats(); } //-------------------------------------------------------------------- /** * Returns detailed information about the specific item in the cache. * * @param string $key Cache item name. * * @return mixed */ public function getMetaData(string $key) { $key = $this->prefix . $key; $stored = $this->memcached->get($key); // if not an array, don't try to count for PHP7.2 if (! is_array($stored) || count($stored) !== 3) { return false; } list($data, $time, $ttl) = $stored; return [ 'expire' => $time + $ttl, 'mtime' => $time, 'data' => $data, ]; } //-------------------------------------------------------------------- /** * Determines if the driver is supported on this system. * * @return boolean */ public function isSupported(): bool { return (extension_loaded('memcached') || extension_loaded('memcache')); } } |
Commits for paulgoughbooks_old/trunk/system/Cache/Handlers/MemcachedHandler.php
Revision | Author | Commited | Message |
---|---|---|---|
2 | tporter | Tue 03 Nov, 2020 08:50:21 +0000 | Migration of Paul Goughs Books site to Codeignitor 4 |