149 lines
4.2 KiB
PHP
149 lines
4.2 KiB
PHP
<?php
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/**
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* StatusNet - the distributed open-source microblogging tool
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* Copyright (C) 2009, StatusNet, Inc.
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*
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* Plugin to implement cache interface with disk files
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*
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* PHP version 5
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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* @category Cache
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* @package StatusNet
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* @author Evan Prodromou <evan@status.net>
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* @copyright 2009 StatusNet, Inc.
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* @license http://www.fsf.org/licensing/licenses/agpl-3.0.html GNU Affero General Public License version 3.0
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* @link http://status.net/
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*/
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if (!defined('STATUSNET')) {
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// This check helps protect against security problems;
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// your code file can't be executed directly from the web.
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exit(1);
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}
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/**
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* A plugin to cache data on local disk
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*
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* @category Cache
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* @package StatusNet
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* @author Evan Prodromou <evan@status.net>
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* @copyright 2009 StatusNet, Inc.
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* @license http://www.fsf.org/licensing/licenses/agpl-3.0.html GNU Affero General Public License version 3.0
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* @link http://status.net/
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*/
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class DiskCachePlugin extends Plugin
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{
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var $root = '/tmp';
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function keyToFilename($key)
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{
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return $this->root . '/' . str_replace(':', '/', $key);
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}
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/**
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* Get a value associated with a key
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*
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* The value should have been set previously.
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*
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* @param string &$key in; Lookup key
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* @param mixed &$value out; value associated with key
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*
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* @return boolean hook success
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*/
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function onStartCacheGet(&$key, &$value)
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{
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$filename = $this->keyToFilename($key);
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if (file_exists($filename)) {
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$data = file_get_contents($filename);
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$value = unserialize($data);
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}
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Event::handle('EndCacheGet', array($key, &$value));
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return false;
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}
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/**
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* Associate a value with a key
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*
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* @param string &$key in; Key to use for lookups
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* @param mixed &$value in; Value to associate
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* @param integer &$flag in; Flag (passed through to Memcache)
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* @param integer &$expiry in; Expiry (passed through to Memcache)
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* @param boolean &$success out; Whether the set was successful
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*
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* @return boolean hook success
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*/
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function onStartCacheSet(&$key, &$value, &$flag, &$expiry, &$success)
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{
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$filename = $this->keyToFilename($key);
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$parent = dirname($filename);
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$sofar = '';
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foreach (explode('/', $parent) as $part) {
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if (empty($part)) {
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continue;
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}
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$sofar .= '/' . $part;
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if (!is_dir($sofar)) {
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$this->debug("Creating new directory '$sofar'");
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$success = mkdir($sofar, 0750);
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if (!$success) {
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$this->log(LOG_ERR, "Can't create directory '$sofar'");
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return false;
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}
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}
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}
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if (is_dir($filename)) {
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$success = false;
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return false;
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}
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file_put_contents($filename, serialize($value));
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Event::handle('EndCacheSet', array($key, $value, $flag,
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$expiry));
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return false;
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}
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/**
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* Delete a value associated with a key
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*
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* @param string &$key in; Key to lookup
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* @param boolean &$success out; whether it worked
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*
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* @return boolean hook success
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*/
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function onStartCacheDelete(&$key, &$success)
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{
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$filename = $this->keyToFilename($key);
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if (file_exists($filename) && !is_dir($filename)) {
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unlink($filename);
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}
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Event::handle('EndCacheDelete', array($key));
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return false;
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}
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}
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