122 lines
3.0 KiB
PHP
122 lines
3.0 KiB
PHP
<?php
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/**
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* Cache based on SQLite 3 <https://www.sqlite.org>
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*/
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class SQLiteCache implements CacheInterface {
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protected $scope;
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protected $key;
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private $db = null;
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public function __construct() {
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if (!extension_loaded('sqlite3')) {
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die('"sqlite3" extension not loaded. Please check "php.ini"');
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}
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$file = Configuration::getConfig(get_called_class(), 'file');
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if (empty($file)) {
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die('Configuration for ' . get_called_class() . ' missing. Please check your ' . FILE_CONFIG);
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}
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if (dirname($file) == '.') {
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$file = PATH_CACHE . $file;
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} elseif (!is_dir(dirname($file))) {
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die('Invalid configuration for ' . get_called_class() . '. Please check your ' . FILE_CONFIG);
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}
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if (!is_file($file)) {
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$this->db = new SQLite3($file);
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$this->db->enableExceptions(true);
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$this->db->exec("CREATE TABLE storage ('key' BLOB PRIMARY KEY, 'value' BLOB, 'updated' INTEGER)");
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} else {
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$this->db = new SQLite3($file);
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$this->db->enableExceptions(true);
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}
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$this->db->busyTimeout(5000);
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}
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public function loadData(){
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$Qselect = $this->db->prepare('SELECT value FROM storage WHERE key = :key');
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$Qselect->bindValue(':key', $this->getCacheKey());
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$result = $Qselect->execute();
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if ($result instanceof SQLite3Result) {
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$data = $result->fetchArray(SQLITE3_ASSOC);
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if (isset($data['value'])) {
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return unserialize($data['value']);
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}
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}
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return null;
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}
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public function saveData($data){
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$Qupdate = $this->db->prepare('INSERT OR REPLACE INTO storage (key, value, updated) VALUES (:key, :value, :updated)');
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$Qupdate->bindValue(':key', $this->getCacheKey());
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$Qupdate->bindValue(':value', serialize($data));
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$Qupdate->bindValue(':updated', time());
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$Qupdate->execute();
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return $this;
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}
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public function getTime(){
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$Qselect = $this->db->prepare('SELECT updated FROM storage WHERE key = :key');
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$Qselect->bindValue(':key', $this->getCacheKey());
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$result = $Qselect->execute();
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if ($result instanceof SQLite3Result) {
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$data = $result->fetchArray(SQLITE3_ASSOC);
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if (isset($data['updated'])) {
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return $data['updated'];
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}
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}
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return null;
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}
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public function purgeCache($seconds){
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$Qdelete = $this->db->prepare('DELETE FROM storage WHERE updated < :expired');
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$Qdelete->bindValue(':expired', time() - $seconds);
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$Qdelete->execute();
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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($scope){
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if(is_null($scope) || !is_string($scope)) {
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throw new \Exception('The given scope is invalid!');
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}
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$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 $this;
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}
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////////////////////////////////////////////////////////////////////////////
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private function getCacheKey(){
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if(is_null($this->key)) {
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throw new \Exception('Call "setKey" first!');
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}
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return hash('sha1', $this->scope . $this->key, true);
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}
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}
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