forked from GNUsocial/gnu-social
3bcff2fa86
Update translator documentation. Number parameters where more than one is used. L10n updates. Update README file to break lines at or just before 80 characters. Remove PHP4-ism "?>" Update indentation. Update whitespace.
251 lines
7.9 KiB
PHP
251 lines
7.9 KiB
PHP
<?php
|
|
/**
|
|
* StatusNet - the distributed open-source microblogging tool
|
|
* Copyright (C) 2009, StatusNet, Inc.
|
|
*
|
|
* Plugin to implement cache interface for memcache
|
|
*
|
|
* PHP version 5
|
|
*
|
|
* This program 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.
|
|
*
|
|
* This program 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 this program. If not, see <http://www.gnu.org/licenses/>.
|
|
*
|
|
* @category Cache
|
|
* @package StatusNet
|
|
* @author Evan Prodromou <evan@status.net>
|
|
* @copyright 2009 StatusNet, Inc.
|
|
* @license http://www.fsf.org/licensing/licenses/agpl-3.0.html GNU Affero General Public License version 3.0
|
|
* @link http://status.net/
|
|
*/
|
|
|
|
if (!defined('STATUSNET')) {
|
|
// This check helps protect against security problems;
|
|
// your code file can't be executed directly from the web.
|
|
exit(1);
|
|
}
|
|
|
|
/**
|
|
* A plugin to use memcache for the cache interface
|
|
*
|
|
* This used to be encoded as config-variable options in the core code;
|
|
* it's now broken out to a separate plugin. The same interface can be
|
|
* implemented by other plugins.
|
|
*
|
|
* @category Cache
|
|
* @package StatusNet
|
|
* @author Evan Prodromou <evan@status.net>
|
|
* @copyright 2009 StatusNet, Inc.
|
|
* @license http://www.fsf.org/licensing/licenses/agpl-3.0.html GNU Affero General Public License version 3.0
|
|
* @link http://status.net/
|
|
*/
|
|
class MemcachePlugin extends Plugin
|
|
{
|
|
static $cacheInitialized = false;
|
|
|
|
private $_conn = null;
|
|
public $servers = array('127.0.0.1;11211');
|
|
|
|
public $compressThreshold = 20480;
|
|
public $compressMinSaving = 0.2;
|
|
|
|
public $persistent = null;
|
|
|
|
public $defaultExpiry = 86400; // 24h
|
|
|
|
/**
|
|
* Initialize the plugin
|
|
*
|
|
* Note that onStartCacheGet() may have been called before this!
|
|
*
|
|
* @return boolean flag value
|
|
*/
|
|
function onInitializePlugin()
|
|
{
|
|
if (self::$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;
|
|
}
|
|
|
|
/**
|
|
* 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
|
|
*/
|
|
function onStartCacheGet(&$key, &$value)
|
|
{
|
|
$this->_ensureConn();
|
|
$value = $this->_conn->get($key);
|
|
Event::handle('EndCacheGet', array($key, &$value));
|
|
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 &$flag in; Flag empty or Cache::COMPRESSED
|
|
* @param integer &$expiry in; Expiry (passed through to Memcache)
|
|
* @param boolean &$success out; Whether the set was successful
|
|
*
|
|
* @return boolean hook success
|
|
*/
|
|
function onStartCacheSet(&$key, &$value, &$flag, &$expiry, &$success)
|
|
{
|
|
$this->_ensureConn();
|
|
if ($expiry === null) {
|
|
$expiry = $this->defaultExpiry;
|
|
}
|
|
$success = $this->_conn->set($key, $value, $this->flag(intval($flag)), $expiry);
|
|
Event::handle('EndCacheSet', array($key, $value, $flag,
|
|
$expiry));
|
|
return false;
|
|
}
|
|
|
|
/**
|
|
* Atomically increment an existing numeric key value.
|
|
* Existing expiration time will not be changed.
|
|
*
|
|
* @param string &$key in; Key to use for lookups
|
|
* @param int &$step in; Amount to increment (default 1)
|
|
* @param mixed &$value out; Incremented value, or false if key not set.
|
|
*
|
|
* @return boolean hook success
|
|
*/
|
|
function onStartCacheIncrement(&$key, &$step, &$value)
|
|
{
|
|
$this->_ensureConn();
|
|
$value = $this->_conn->increment($key, $step);
|
|
Event::handle('EndCacheIncrement', array($key, $step, $value));
|
|
return false;
|
|
}
|
|
|
|
/**
|
|
* Delete a value associated with a key
|
|
*
|
|
* @param string &$key in; Key to lookup
|
|
* @param boolean &$success out; whether it worked
|
|
*
|
|
* @return boolean hook success
|
|
*/
|
|
function onStartCacheDelete(&$key, &$success)
|
|
{
|
|
$this->_ensureConn();
|
|
$success = $this->_conn->delete($key);
|
|
Event::handle('EndCacheDelete', array($key));
|
|
return false;
|
|
}
|
|
|
|
function onStartCacheReconnect(&$success)
|
|
{
|
|
if (empty($this->_conn)) {
|
|
// nothing to do
|
|
return true;
|
|
}
|
|
if ($this->persistent) {
|
|
common_log(LOG_ERR, "Cannot close persistent memcached connection");
|
|
$success = false;
|
|
} else {
|
|
common_log(LOG_INFO, "Closing memcached connection");
|
|
$success = $this->_conn->close();
|
|
$this->_conn = null;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
/**
|
|
* Ensure that a connection exists
|
|
*
|
|
* Checks the instance $_conn variable and connects
|
|
* if it is empty.
|
|
*
|
|
* @return void
|
|
*/
|
|
private function _ensureConn()
|
|
{
|
|
if (empty($this->_conn)) {
|
|
$this->_conn = new Memcache();
|
|
|
|
if (is_array($this->servers)) {
|
|
$servers = $this->servers;
|
|
} else {
|
|
$servers = array($this->servers);
|
|
}
|
|
foreach ($servers as $server) {
|
|
if (strpos($server, ';') !== false) {
|
|
list($host, $port) = explode(';', $server);
|
|
} else {
|
|
$host = $server;
|
|
$port = 11211;
|
|
}
|
|
|
|
$this->_conn->addServer($host, $port, $this->persistent);
|
|
}
|
|
|
|
// Compress items stored in the cache if they're over threshold in size
|
|
// (default 2KiB) and the compression would save more than min savings
|
|
// ratio (default 0.2).
|
|
|
|
// Allows the cache to store objects larger than 1MB (if they
|
|
// compress to less than 1MB), and improves cache memory efficiency.
|
|
|
|
$this->_conn->setCompressThreshold($this->compressThreshold,
|
|
$this->compressMinSaving);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Translate general flags to Memcached-specific flags
|
|
* @param int $flag
|
|
* @return int
|
|
*/
|
|
protected function flag($flag)
|
|
{
|
|
$out = 0;
|
|
if ($flag & Cache::COMPRESSED == Cache::COMPRESSED) {
|
|
$out |= MEMCACHE_COMPRESSED;
|
|
}
|
|
return $out;
|
|
}
|
|
|
|
function onPluginVersion(&$versions)
|
|
{
|
|
$versions[] = array('name' => 'Memcache',
|
|
'version' => STATUSNET_VERSION,
|
|
'author' => 'Evan Prodromou, Craig Andrews',
|
|
'homepage' => 'http://status.net/wiki/Plugin:Memcache',
|
|
'rawdescription' =>
|
|
// TRANS: Plugin description.
|
|
_m('Use <a href="http://memcached.org/">Memcached</a> to cache query results.'));
|
|
return true;
|
|
}
|
|
}
|