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<?php |
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namespace BFW; |
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use \Exception; |
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/** |
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* Class to manage connection to memcache(d) server with memcached lib |
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*/ |
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class Memcached extends \Memcached |
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{ |
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/** |
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* @const ERR_NO_SERVER_CONNECTED Exception code if no server is connected. |
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*/ |
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const ERR_NO_SERVER_CONNECTED = 1105001; |
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/** |
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* @const ERR_A_SERVER_IS_NOT_CONNECTED Exception code if a server is not |
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* connected. |
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*/ |
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const ERR_A_SERVER_IS_NOT_CONNECTED = 1105002; |
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/** |
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* @const ERR_KEY_NOT_EXIST Exception code if the asked key not exist. |
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* Actually only used into the method updateExpire(). |
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*/ |
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const ERR_KEY_NOT_EXIST = 1105003; |
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/** |
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* @var array $config Config define into bfw config file for memcache(d) |
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*/ |
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protected $config; |
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/** |
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* Constructor. |
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* Call parent constructor with the persistentId if declared in config |
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* Connect to servers. |
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*/ |
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public function __construct() |
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{ |
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$app = \BFW\Application::getInstance(); |
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$this->config = $app->getConfig()->getValue( |
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'memcached', |
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'memcached.php' |
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); |
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if (!empty($this->config['persistentId'])) { |
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parent::__construct($this->config['persistentId']); |
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} else { |
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parent::__construct(); |
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} |
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} |
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/** |
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* Get accessor to the property config |
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* |
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* @return array |
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*/ |
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public function getConfig(): array |
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{ |
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return $this->config; |
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} |
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/** |
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* Get the list of server already connected (persistent) |
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* Loop on server declared into the config file. |
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* Connect to server if not already connected |
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* |
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* @return void |
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*/ |
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public function connectToServers() |
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{ |
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//Array for the list of server(s) to connect |
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$addServers = []; |
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//Get all server already connected (persistent) |
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$serversList = $this->generateServerList(); |
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//Loop on server declared into config |
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foreach ($this->config['servers'] as $server) { |
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$this->completeServerInfos($server); |
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$host = $server['host']; |
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$port = $server['port']; |
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$weight = $server['weight']; |
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//not check if port = (int) 0; Doc said to define to 0 for socket. |
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if (empty($host) || $port === null) { |
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continue; |
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} |
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//search if the reading server is not already connected |
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if (in_array($host.':'.$port, $serversList)) { |
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continue; |
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} |
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\BFW\Application::getInstance() |
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->getMonolog() |
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->getLogger() |
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->debug( |
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'Try to connect to memcached server.', |
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[ |
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'host' => $host, |
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'port' => $port |
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] |
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); |
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//If not, add the server at the list to connect |
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$addServers[] = [$host, $port, $weight]; |
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} |
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//Connect to server(s) |
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$this->addServers($addServers); |
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//Check if connect is successfull |
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$this->testConnect(); |
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} |
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/** |
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* Get the list of servers where we are already connected (persistent) |
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* |
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* @return string[] |
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*/ |
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protected function generateServerList(): array |
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{ |
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$serversList = $this->getServerList(); |
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$servers = []; |
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foreach ($serversList as $serverInfos) { |
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$servers[] = $serverInfos['host'].':'.$serverInfos['port']; |
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} |
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return $servers; |
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} |
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/** |
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* Read the server information and add not existing keys |
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* |
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* @param array &$infos Server informations |
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* |
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* @return void |
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* |
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* @throw \Exception If informations datas is not an array |
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*/ |
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protected function completeServerInfos(array &$infos) |
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{ |
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$infosKeyDefaultValues = [ |
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'host' => null, |
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'port' => null, |
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'weight' => 0, |
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'timeout' => null, |
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'persistent' => false |
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]; |
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foreach ($infosKeyDefaultValues as $infosKey => $defaultValue) { |
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if (!isset($infos[$infosKey])) { |
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$infos[$infosKey] = $defaultValue; |
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} |
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} |
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} |
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/** |
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* addServer not created the connection. It's created at the first call |
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* to the memcached servers. |
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* |
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* So, we run the connect to all server declared |
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* |
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* @throws \Exception If a server is not connected |
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* |
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* @return boolean |
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*/ |
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protected function testConnect(): bool |
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{ |
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$stats = $this->getStats(); |
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if (!is_array($stats)) { |
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throw new Exception( |
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'No memcached server connected.', |
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self::ERR_NO_SERVER_CONNECTED |
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); |
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} |
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foreach ($stats as $serverName => $serverStat) { |
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if ($serverStat['uptime'] < 1) { |
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throw new Exception( |
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'Memcached server '.$serverName.' not connected', |
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self::ERR_A_SERVER_IS_NOT_CONNECTED |
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); |
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} |
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} |
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return true; |
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} |
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/** |
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* Check if a key exists into memcache(d) |
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* /!\ Not work if the correct value is the boolean false /!\ |
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* |
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* @param string $key The memcache(d) key to check |
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* |
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* @return boolean |
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* |
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* @throws \Exception If the key is not a string |
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*/ |
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public function ifExists(string $key): bool |
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{ |
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if ($this->get($key) === false) { |
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return false; |
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} |
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return true; |
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} |
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/** |
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* Update the expire time for a memcache(d) key. |
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* |
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* @param string $key The memcache(d) key to update |
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* @param int $expire The new expire time |
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* |
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* @return boolean |
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* |
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* @throws \Exception |
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*/ |
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public function updateExpire(string $key, int $expire): bool |
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{ |
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if (!$this->ifExists($key)) { |
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throw new Exception( |
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'The key '.$key.' not exist on memcache(d) server', |
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self::ERR_KEY_NOT_EXIST |
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); |
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} |
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//To change expire time, we need to re-set the value. |
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$value = $this->get($key); //Get the value |
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//Re-set the value with new expire time. |
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return $this->replace($key, $value, $expire); //We can use touch() |
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} |
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} |
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bfw-systems /
bfw
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