e4c4ae8245
FileCache and SQLiteCache returns null on cache miss. This is important if using strict comparing (for example when using "===")
115 lines
2.9 KiB
PHP
115 lines
2.9 KiB
PHP
<?php
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class MemcachedCache implements CacheInterface {
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private $scope;
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private $key;
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private $conn;
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private $expiration = 0;
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private $time = false;
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private $data = null;
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public function __construct() {
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if (!extension_loaded('memcached')) {
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returnServerError('"memcached" extension not loaded. Please check "php.ini"');
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}
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$host = Configuration::getConfig(get_called_class(), 'host');
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$port = Configuration::getConfig(get_called_class(), 'port');
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if (empty($host) && empty($port)) {
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returnServerError('Configuration for ' . get_called_class() . ' missing. Please check your ' . FILE_CONFIG);
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} else if (empty($host)) {
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returnServerError('"host" param is not set for ' . get_called_class() . '. Please check your ' . FILE_CONFIG);
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} else if (empty($port)) {
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returnServerError('"port" param is not set for ' . get_called_class() . '. Please check your ' . FILE_CONFIG);
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} else if (!ctype_digit($port)) {
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returnServerError('"port" param is invalid for ' . get_called_class() . '. Please check your ' . FILE_CONFIG);
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}
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$port = intval($port);
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if ($port < 1 || $port > 65535) {
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returnServerError('"port" param is invalid for ' . get_called_class() . '. Please check your ' . FILE_CONFIG);
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}
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$conn = new Memcached();
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$conn->addServer($host, $port) or returnServerError('Could not connect to memcached server');
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$this->conn = $conn;
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}
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public function loadData(){
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if ($this->data) return $this->data;
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$result = $this->conn->get($this->getCacheKey());
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if ($result === false) {
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return null;
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}
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$this->time = $result['time'];
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$this->data = $result['data'];
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return $result['data'];
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}
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public function saveData($datas){
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$time = time();
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$object_to_save = array(
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'data' => $datas,
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'time' => $time,
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);
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$result = $this->conn->set($this->getCacheKey(), $object_to_save, $this->expiration);
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if($result === false) {
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returnServerError('Cannot write the cache to memcached server');
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}
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$this->time = $time;
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return $this;
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}
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public function getTime(){
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if ($this->time === false) {
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$this->loadData();
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}
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return $this->time;
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}
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public function purgeCache($duration){
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// Note: does not purges cache right now
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// Just sets cache expiration and leave cache purging for memcached itself
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$this->expiration = $duration;
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}
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/**
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* Set scope
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* @return self
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*/
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public function setScope($scope){
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$this->scope = $scope;
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return $this;
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}
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/**
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* Set key
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* @return self
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*/
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public function setKey($key){
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if (!empty($key) && is_array($key)) {
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$key = array_map('strtolower', $key);
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}
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$key = json_encode($key);
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if (!is_string($key)) {
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throw new \Exception('The given key is invalid!');
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}
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$this->key = $key;
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return $this;
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}
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private function getCacheKey(){
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if(is_null($this->key)) {
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returnServerError('Call "setKey" first!');
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}
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return 'rss_bridge_cache_' . hash('md5', $this->scope . $this->key . 'A');
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}
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}
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