ccf375e917
The configuration files are currently hard-coded in the configuration classes and error messages. However, the implementation should not rely on specific details like the file name. Instead, the files should be part of the global definition. This commit introduces two global constants for the configuration files - FILE_CONFIG => 'config.ini.php' - FILE_CONFIG_DEFAULT => 'config.default.ini.php'
122 lines
3 KiB
PHP
122 lines
3 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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