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- <?php
- /**
- * Cache with file system
- */
- class FileCache implements CacheInterface {
- protected $path;
- protected $param;
- public function loadData(){
- return unserialize(file_get_contents($this->getCacheFile()));
- }
- public function saveData($datas){
- // Notice: We use plain serialize() here to reduce memory footprint on
- // large input data.
- $writeStream = file_put_contents($this->getCacheFile(), serialize($datas));
- if($writeStream === false) {
- throw new \Exception("Cannot write the cache... Do you have the right permissions ?");
- }
- return $this;
- }
- public function getTime(){
- $cacheFile = $this->getCacheFile();
- if(file_exists($cacheFile)) {
- return filemtime($cacheFile);
- }
- return false;
- }
- public function purgeCache($duration){
- $cachePath = $this->getPath();
- if(file_exists($cachePath)) {
- $cacheIterator = new RecursiveIteratorIterator(
- new RecursiveDirectoryIterator($cachePath),
- RecursiveIteratorIterator::CHILD_FIRST
- );
- foreach($cacheIterator as $cacheFile) {
- if(in_array($cacheFile->getBasename(), array('.', '..', '.gitkeep')))
- continue;
- elseif($cacheFile->isFile()) {
- if(filemtime($cacheFile->getPathname()) < time() - $duration)
- unlink($cacheFile->getPathname());
- }
- }
- }
- }
- /**
- * Set cache path
- * @return self
- */
- public function setPath($path){
- if(is_null($path) || !is_string($path)) {
- throw new \Exception('The given path is invalid!');
- }
- $this->path = $path;
- // Make sure path ends with '/' or '\'
- $lastchar = substr($this->path, -1, 1);
- if($lastchar !== '/' && $lastchar !== '\\')
- $this->path .= '/';
- if(!is_dir($this->path))
- mkdir($this->path, 0755, true);
- return $this;
- }
- /**
- * Set HTTP GET parameters
- * @return self
- */
- public function setParameters(array $param){
- $this->param = array_map('strtolower', $param);
- return $this;
- }
- /**
- * Return cache path (and create if not exist)
- * @return string Cache path
- */
- protected function getPath(){
- if(is_null($this->path)) {
- throw new \Exception('Call "setPath" first!');
- }
- return $this->path;
- }
- /**
- * Get the file name use for cache store
- * @return string Path to the file cache
- */
- protected function getCacheFile(){
- return $this->getPath() . $this->getCacheName();
- }
- /**
- * Determines file name for store the cache
- * return string
- */
- protected function getCacheName(){
- if(is_null($this->param)) {
- throw new \Exception('Call "setParameters" first!');
- }
- // Change character when making incompatible changes to prevent loading
- // errors due to incompatible file contents \|/
- return hash('md5', http_build_query($this->param) . 'A') . '.cache';
- }
- }
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