gnu-social/plugins/RedisCache/RedisCachePlugin.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/>.
/**
* Plugin implementing Redis based caching
*
* @category Files
* @package GNUsocial
* @author Stéphane Bérubé <chimo@chromic.org>
* @author Miguel Dantas <biodantas@gmail.com>
* @copyright 2018, 2019 Free Software Foundation, Inc http://www.fsf.org
* @license https://www.gnu.org/licenses/agpl.html GNU AGPL v3 or later
*/
defined('GNUSOCIAL') || die();
use Predis\Client;
use Predis\PredisException;
class RedisCachePlugin extends Plugin
{
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const PLUGIN_VERSION = '0.1.0';
public static $cacheInitialized = false;
public $persistent = null;
// settings which can be set in config.php with addPlugin('Embed', ['param'=>'value', ...]);
public $server = null;
public $defaultExpiry = 86400; // 24h
protected $client = null;
public function onInitializePlugin()
{
if (self::$cacheInitialized) {
$this->persistent = true;
} else {
// If we're a parent command-line process we need
// to be able to close out the connection after
// forking, so disable persistence.
//
// We'll turn it back on again the second time
// through which will either be in a child process,
// or a single-process script which is switching
// configurations.
$this->persistent = (php_sapi_name() === 'cli') ? false : true;
}
$this->ensureConn();
self::$cacheInitialized = true;
return true;
}
public function onStartCacheGet($key, &$value)
{
try {
$this->ensureConn();
$data = $this->client->get($key);
} catch (PredisException $e) {
common_log(LOG_ERR, 'RedisCache encountered exception ' . get_class($e) . ': ' . $e->getMessage());
return true;
}
if (is_null($data)) {
// Miss, let GS do its thing
return true;
}
$ret = unserialize($data);
if ($ret === false && $data !== 'b:0;') {
common_log(LOG_ERR, 'RedisCache could not handle: ' . $data);
return true;
}
// Hit, overwrite "value" and return false
// to indicate we took care of this
$value = $ret;
return false;
}
public function onStartCacheSet($key, $value, $flag, $expiry, &$success)
{
$success = false;
if (is_null($expiry)) {
$expiry = $this->defaultExpiry;
}
try {
$this->ensureConn();
$ret = $this->client->setex($key, $expiry, serialize($value));
} catch (PredisException $e) {
$ret = false;
common_log(LOG_ERR, 'RedisCache encountered exception ' . get_class($e) . ': ' . $e->getMessage());
}
if (is_bool($ret)
|| is_numeric($ret)) {
$success = ($ret ? true : false);
} elseif (is_object($ret) && method_exists($ret, 'getPayload')) {
$success = ($ret->getPayload() === 'OK');
}
return !$success;
}
public function onStartCacheDelete($key)
{
if ($key === null) {
return true;
}
try {
$this->ensureConn();
$ret = $this->client->del($key);
} catch (PredisException $e) {
common_log(LOG_ERR, 'RedisCache encountered exception ' . get_class($e) . ': ' . $e->getMessage());
}
// Let other caches delete stuff if we didn't succeed
return isset($ret) && $ret === 1;
}
public function onStartCacheIncrement($key, $step, $value)
{
try {
$this->ensureConn();
$this->client->incrby($key, $step);
} catch (PredisException $e) {
common_log(LOG_ERR, 'RedisCache encountered exception ' . get_class($e) . ': ' . $e->getMessage());
return true;
}
return false;
}
public function onStartCacheReconnect(bool &$success): bool
{
if (is_null($this->client)) {
// nothing to do
return true;
}
if ($this->persistent) {
common_log(LOG_ERR, 'Cannot close persistent Redis connection');
$success = false;
} else {
common_log(LOG_INFO, 'Closing Redis connection');
$success = $this->client->disconnect();
$this->client = null;
}
return false;
}
private function ensureConn(): void
{
if (is_null($this->client)) {
$this->client = new Client(
$this->server,
['persistent' => $this->persistent]
);
}
}
public function onPluginVersion(array &$versions): bool
{
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$versions[] = [
'name' => 'RedisCache',
'version' => self::PLUGIN_VERSION,
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'author' => 'Stéphane Bérubé (chimo)',
'homepage' => 'https://github.com/chimo/gs-rediscache',
'description' =>
// TRANS: Plugin description.
_m('Plugin implementing Redis as a backend for GNU social caching')
];
return true;
}
}