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