gnu-social/plugins/DiskCache/DiskCachePlugin.php

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<?php
// This file is part of GNU social - https://www.gnu.org/software/social
//
// GNU social is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// GNU social is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with GNU social. If not, see <http://www.gnu.org/licenses/>.
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/**
* Plugin to implement cache interface with disk files
*
* @category Cache
* @package GNUsocial
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* @author Evan Prodromou <evan@status.net>
* @copyright 2009 StatusNet, Inc.
* @license https://www.gnu.org/licenses/agpl.html GNU AGPL v3 or later
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*/
defined('GNUSOCIAL') || die();
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/**
* A plugin to cache data on local disk
*
* @category Cache
* @package GNUsocial
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* @author Evan Prodromou <evan@status.net>
* @copyright 2009 StatusNet, Inc.
* @license https://www.gnu.org/licenses/agpl.html GNU AGPL v3 or later
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*/
class DiskCachePlugin extends Plugin
{
const PLUGIN_VERSION = '2.0.0';
public $root = '/tmp';
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public function keyToFilename($key)
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{
return $this->root . '/' . str_replace(':', '/', $key);
}
/**
* Get a value associated with a key
*
* The value should have been set previously.
*
* @param string &$key in; Lookup key
* @param mixed &$value out; value associated with key
*
* @return boolean hook success
*/
public function onStartCacheGet(&$key, &$value)
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{
$filename = $this->keyToFilename($key);
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$data = false;
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if (file_exists($filename)) {
$data = file_get_contents($filename);
}
if ($data === false) {
return true;
}
$ret = unserialize($data);
if ($ret === false && $data !== 'b:0;') {
common_log(LOG_ERR, 'DiskCache could not handle: ' . $data);
return true;
}
$value = $ret;
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return false;
}
/**
* Associate a value with a key
*
* @param string &$key in; Key to use for lookups
* @param mixed &$value in; Value to associate
* @param integer &$flag in; Flag (passed through to Memcache)
* @param integer &$expiry in; Expiry (passed through to Memcache)
* @param boolean &$success out; Whether the set was successful
*
* @return boolean hook success
*/
public function onStartCacheSet(&$key, &$value, &$flag, &$expiry, &$success)
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{
$filename = $this->keyToFilename($key);
$parent = dirname($filename);
$sofar = '';
foreach (explode('/', $parent) as $part) {
if (empty($part)) {
continue;
}
$sofar .= '/' . $part;
if (!is_dir($sofar)) {
$this->debug("Creating new directory '$sofar'");
$success = mkdir($sofar, 0750);
if (!$success) {
$this->log(LOG_ERR, "Can't create directory '$sofar'");
return false;
}
}
}
if (is_dir($filename)) {
$success = false;
return false;
}
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// Write to a temp file and move to destination
$tempname = tempnam(null, 'statusnetdiskcache');
$result = file_put_contents($tempname, serialize($value));
if ($result === false) {
$this->log(LOG_ERR, "Couldn't write '$key' to temp file '$tempname'");
return false;
}
$result = rename($tempname, $filename);
if (!$result) {
$this->log(LOG_ERR, "Couldn't move temp file '$tempname' to path '$filename' for key '$key'");
@unlink($tempname);
return false;
}
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return false;
}
/**
* Delete a value associated with a key
*
* @param string &$key in; Key to lookup
* @param boolean &$success out; whether it worked
*
* @return boolean hook success
*/
public function onStartCacheDelete(&$key, &$success)
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{
$filename = $this->keyToFilename($key);
if (file_exists($filename) && !is_dir($filename)) {
unlink($filename);
}
return false;
}
public function onPluginVersion(array &$versions): bool
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{
$versions[] = array('name' => 'DiskCache',
'version' => self::PLUGIN_VERSION,
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'author' => 'Evan Prodromou',
'homepage' => GNUSOCIAL_ENGINE_REPO_URL . 'tree/master/plugins/DiskCache',
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'rawdescription' =>
// TRANS: Plugin description.
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_m('Plugin to implement cache interface with disk files.'));
return true;
}
}