YuCheng Hu
1ec191d88b
+YUCHENG HU+ git-svn-id: https://svn.code.sf.net/p/hawebs/svn@423 a2543c7e-f6e9-4f8a-8bff-1ffc34733512
123 lines
3.4 KiB
PHP
123 lines
3.4 KiB
PHP
<?php
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/**
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* Piwik - Open source web analytics
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*
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* @link http://piwik.org
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* @license http://www.gnu.org/licenses/gpl-3.0.html Gpl v3 or later
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* @version $Id: CacheFile.php 1970 2010-03-22 11:26:54Z matt $
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*
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* @category Piwik
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* @package Piwik
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*/
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/**
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* Code originally inspired from OpenX
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* - openx/plugins_repo/openXDeliveryCacheStore/extensions/deliveryCacheStore/oxCacheFile/oxCacheFile.class.php
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* - openx/plugins_repo/openXDeliveryCacheStore/extensions/deliveryCacheStore/oxCacheFile/oxCacheFile.delivery.php
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*
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* We may want to add support for cache expire, storing last modification time in the file. See code in:
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* - openx/lib/max/Delivery/cache.php
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*
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* @package Piwik
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*/
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class Piwik_CacheFile
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{
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protected $cachePath;
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protected $cachePrefix;
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function __construct($directory)
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{
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$this->cachePath = PIWIK_USER_PATH . '/tmp/cache/' . $directory . '/';
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}
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/**
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* Function to fetch a cache entry
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*
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* @param string $filename The name of file where cache entry is stored
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* @return mixed False on error, or array the cache content
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*/
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function get($id)
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{
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$cache_complete = false;
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$content = '';
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// We are assuming that most of the time cache will exists
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$ok = @include($this->cachePath . $id . '.php');
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if ($ok && $cache_complete == true) {
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return $content;
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}
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return false;
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}
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/**
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* A function to store content a cache entry.
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*
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* @param string $id The filename where cache entry is stored
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* @param array $content The cache content
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* @return bool True if the entry was succesfully stored
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*/
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function set($id, $content)
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{
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if( !is_dir($this->cachePath))
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{
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Piwik_Common::mkdir($this->cachePath);
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}
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if (!is_writable($this->cachePath)) {
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return false;
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}
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$id = $this->cachePath . $id . '.php';
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$cache_literal = "<"."?php\n\n";
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$cache_literal .= "$"."content = ".var_export($content, true).";\n\n";
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$cache_literal .= "$"."cache_complete = true;\n\n";
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$cache_literal .= "?".">";
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// Write cache to a temp file, then rename it, overwritng the old cache
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// On *nix systems this should guarantee atomicity
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$tmp_filename = tempnam($this->cachePath, 'tmp_');
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if ($fp = @fopen($tmp_filename, 'wb')) {
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@fwrite ($fp, $cache_literal, strlen($cache_literal));
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@fclose ($fp);
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if (!@rename($tmp_filename, $id)) {
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// On some systems rename() doesn't overwrite destination
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@unlink($id);
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if (!@rename($tmp_filename, $id)) {
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// Make sure that no temporary file is left over
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// if the destination is not writable
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@unlink($tmp_filename);
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}
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}
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return true;
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}
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return false;
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}
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/**
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* A function to delete a single cache entry
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*
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* @param string $filename The cache entry filename (hashed name)
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* @return bool True if the entres were succesfully deleted
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*/
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function delete($id)
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{
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$filename = $this->cachePath . $id . '.php';
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if (file_exists($filename)) {
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@unlink ($filename);
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return true;
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}
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return false;
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}
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/**
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* A function to delete all cache entries in the directory
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*/
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function deleteAll()
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{
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Piwik::unlinkRecursive($this->cachePath, $deleteRootToo = false);
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}
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}
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