783 lines
17 KiB
PHP
783 lines
17 KiB
PHP
<?php
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#
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# Copyright (C) 2003-2004 Brion Vibber <brion@pobox.com>
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# http://www.mediawiki.org/
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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 General Public License as published by
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# the Free Software Foundation; either version 2 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 General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License along
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# with this program; if not, write to the Free Software Foundation, Inc.,
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# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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# http://www.gnu.org/copyleft/gpl.html
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/**
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*
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*/
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/**
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* Simple generic object store
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*
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* interface is intended to be more or less compatible with
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* the PHP memcached client.
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*
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* backends for local hash array and SQL table included:
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* <code>
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* $bag = new HashBagOStuff();
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* $bag = new MysqlBagOStuff($tablename); # connect to db first
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* </code>
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*
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*/
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class BagOStuff {
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var $debugmode;
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function __construct() {
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$this->set_debug( false );
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}
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function set_debug($bool) {
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$this->debugmode = $bool;
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}
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/* *** THE GUTS OF THE OPERATION *** */
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/* Override these with functional things in subclasses */
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function get($key) {
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/* stub */
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return false;
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}
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function set($key, $value, $exptime=0) {
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/* stub */
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return false;
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}
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function delete($key, $time=0) {
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/* stub */
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return false;
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}
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function lock($key, $timeout = 0) {
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/* stub */
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return true;
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}
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function unlock($key) {
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/* stub */
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return true;
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}
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function keys() {
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/* stub */
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return array();
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}
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/* *** Emulated functions *** */
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/* Better performance can likely be got with custom written versions */
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function get_multi($keys) {
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$out = array();
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foreach($keys as $key)
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$out[$key] = $this->get($key);
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return $out;
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}
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function set_multi($hash, $exptime=0) {
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foreach($hash as $key => $value)
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$this->set($key, $value, $exptime);
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}
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function add($key, $value, $exptime=0) {
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if( $this->get($key) == false ) {
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$this->set($key, $value, $exptime);
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return true;
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}
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}
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function add_multi($hash, $exptime=0) {
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foreach($hash as $key => $value)
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$this->add($key, $value, $exptime);
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}
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function delete_multi($keys, $time=0) {
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foreach($keys as $key)
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$this->delete($key, $time);
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}
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function replace($key, $value, $exptime=0) {
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if( $this->get($key) !== false )
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$this->set($key, $value, $exptime);
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}
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function incr($key, $value=1) {
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if ( !$this->lock($key) ) {
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return false;
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}
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$value = intval($value);
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if($value < 0) $value = 0;
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$n = false;
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if( ($n = $this->get($key)) !== false ) {
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$n += $value;
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$this->set($key, $n); // exptime?
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}
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$this->unlock($key);
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return $n;
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}
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function decr($key, $value=1) {
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if ( !$this->lock($key) ) {
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return false;
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}
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$value = intval($value);
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if($value < 0) $value = 0;
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$m = false;
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if( ($n = $this->get($key)) !== false ) {
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$m = $n - $value;
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if($m < 0) $m = 0;
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$this->set($key, $m); // exptime?
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}
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$this->unlock($key);
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return $m;
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}
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function _debug($text) {
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if($this->debugmode)
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wfDebug("BagOStuff debug: $text\n");
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}
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/**
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* Convert an optionally relative time to an absolute time
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*/
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static function convertExpiry( $exptime ) {
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if(($exptime != 0) && ($exptime < 3600*24*30)) {
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return time() + $exptime;
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} else {
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return $exptime;
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}
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}
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}
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/**
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* Functional versions!
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* @todo document
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*/
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class HashBagOStuff extends BagOStuff {
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/*
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This is a test of the interface, mainly. It stores
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things in an associative array, which is not going to
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persist between program runs.
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*/
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var $bag;
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function __construct() {
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$this->bag = array();
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}
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function _expire($key) {
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$et = $this->bag[$key][1];
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if(($et == 0) || ($et > time()))
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return false;
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$this->delete($key);
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return true;
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}
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function get($key) {
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if(!$this->bag[$key])
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return false;
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if($this->_expire($key))
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return false;
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return $this->bag[$key][0];
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}
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function set($key,$value,$exptime=0) {
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$this->bag[$key] = array( $value, BagOStuff::convertExpiry( $exptime ) );
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}
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function delete($key,$time=0) {
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if(!$this->bag[$key])
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return false;
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unset($this->bag[$key]);
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return true;
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}
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function keys() {
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return array_keys( $this->bag );
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}
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}
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/*
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CREATE TABLE objectcache (
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keyname char(255) binary not null default '',
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value mediumblob,
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exptime datetime,
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unique key (keyname),
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key (exptime)
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);
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*/
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/**
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* @todo document
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* @abstract
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*/
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abstract class SqlBagOStuff extends BagOStuff {
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var $table;
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var $lastexpireall = 0;
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function __construct($tablename = 'objectcache') {
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$this->table = $tablename;
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}
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function get($key) {
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/* expire old entries if any */
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$this->garbageCollect();
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$res = $this->_query(
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"SELECT value,exptime FROM $0 WHERE keyname='$1'", $key);
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if(!$res) {
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$this->_debug("get: ** error: " . $this->_dberror($res) . " **");
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return false;
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}
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if($row=$this->_fetchobject($res)) {
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$this->_debug("get: retrieved data; exp time is " . $row->exptime);
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if ( $row->exptime != $this->_maxdatetime() &&
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wfTimestamp( TS_UNIX, $row->exptime ) < time() )
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{
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$this->_debug("get: key has expired, deleting");
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$this->delete($key);
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return false;
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}
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return $this->_unserialize($this->_blobdecode($row->value));
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} else {
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$this->_debug('get: no matching rows');
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}
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return false;
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}
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function set($key,$value,$exptime=0) {
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if ( wfReadOnly() ) {
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return false;
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}
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$exptime = intval($exptime);
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if($exptime < 0) $exptime = 0;
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if($exptime == 0) {
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$exp = $this->_maxdatetime();
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} else {
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if($exptime < 3.16e8) # ~10 years
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$exptime += time();
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$exp = $this->_fromunixtime($exptime);
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}
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$this->delete( $key );
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$this->_doinsert($this->getTableName(), array(
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'keyname' => $key,
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'value' => $this->_blobencode($this->_serialize($value)),
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'exptime' => $exp
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));
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return true; /* ? */
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}
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function delete($key,$time=0) {
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if ( wfReadOnly() ) {
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return false;
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}
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$this->_query(
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"DELETE FROM $0 WHERE keyname='$1'", $key );
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return true; /* ? */
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}
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function keys() {
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$res = $this->_query( "SELECT keyname FROM $0" );
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if(!$res) {
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$this->_debug("keys: ** error: " . $this->_dberror($res) . " **");
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return array();
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}
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$result = array();
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while( $row = $this->_fetchobject($res) ) {
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$result[] = $row->keyname;
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}
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return $result;
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}
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function getTableName() {
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return $this->table;
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}
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function _query($sql) {
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$reps = func_get_args();
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$reps[0] = $this->getTableName();
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// ewwww
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for($i=0;$i<count($reps);$i++) {
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$sql = str_replace(
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'$' . $i,
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$i > 0 ? $this->_strencode($reps[$i]) : $reps[$i],
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$sql);
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}
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$res = $this->_doquery($sql);
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if($res == false) {
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$this->_debug('query failed: ' . $this->_dberror($res));
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}
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return $res;
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}
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function _strencode($str) {
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/* Protect strings in SQL */
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return str_replace( "'", "''", $str );
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}
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function _blobencode($str) {
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return $str;
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}
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function _blobdecode($str) {
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return $str;
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}
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abstract function _doinsert($table, $vals);
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abstract function _doquery($sql);
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function _freeresult($result) {
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/* stub */
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return false;
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}
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function _dberror($result) {
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/* stub */
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return 'unknown error';
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}
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abstract function _maxdatetime();
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abstract function _fromunixtime($ts);
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function garbageCollect() {
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/* Ignore 99% of requests */
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if ( !mt_rand( 0, 100 ) ) {
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$nowtime = time();
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/* Avoid repeating the delete within a few seconds */
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if ( $nowtime > ($this->lastexpireall + 1) ) {
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$this->lastexpireall = $nowtime;
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$this->expireall();
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}
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}
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}
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function expireall() {
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/* Remove any items that have expired */
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if ( wfReadOnly() ) {
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return false;
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}
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$now = $this->_fromunixtime( time() );
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$this->_query( "DELETE FROM $0 WHERE exptime < '$now'" );
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}
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function deleteall() {
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/* Clear *all* items from cache table */
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if ( wfReadOnly() ) {
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return false;
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}
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$this->_query( "DELETE FROM $0" );
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}
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/**
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* Serialize an object and, if possible, compress the representation.
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* On typical message and page data, this can provide a 3X decrease
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* in storage requirements.
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*
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* @param mixed $data
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* @return string
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*/
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function _serialize( &$data ) {
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$serial = serialize( $data );
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if( function_exists( 'gzdeflate' ) ) {
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return gzdeflate( $serial );
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} else {
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return $serial;
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}
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}
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/**
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* Unserialize and, if necessary, decompress an object.
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* @param string $serial
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* @return mixed
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*/
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function _unserialize( $serial ) {
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if( function_exists( 'gzinflate' ) ) {
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$decomp = @gzinflate( $serial );
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if( false !== $decomp ) {
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$serial = $decomp;
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}
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}
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$ret = unserialize( $serial );
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return $ret;
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}
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}
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/**
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* @todo document
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*/
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class MediaWikiBagOStuff extends SqlBagOStuff {
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var $tableInitialised = false;
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function _doquery($sql) {
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$dbw = wfGetDB( DB_MASTER );
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return $dbw->query($sql, 'MediaWikiBagOStuff::_doquery');
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}
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function _doinsert($t, $v) {
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$dbw = wfGetDB( DB_MASTER );
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return $dbw->insert($t, $v, 'MediaWikiBagOStuff::_doinsert',
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array( 'IGNORE' ) );
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}
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function _fetchobject($result) {
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$dbw = wfGetDB( DB_MASTER );
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return $dbw->fetchObject($result);
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}
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function _freeresult($result) {
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$dbw = wfGetDB( DB_MASTER );
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return $dbw->freeResult($result);
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}
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function _dberror($result) {
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$dbw = wfGetDB( DB_MASTER );
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return $dbw->lastError();
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}
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function _maxdatetime() {
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if ( time() > 0x7fffffff ) {
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return $this->_fromunixtime( 1<<62 );
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} else {
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return $this->_fromunixtime( 0x7fffffff );
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}
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}
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function _fromunixtime($ts) {
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$dbw = wfGetDB(DB_MASTER);
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return $dbw->timestamp($ts);
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}
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function _strencode($s) {
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$dbw = wfGetDB( DB_MASTER );
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return $dbw->strencode($s);
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}
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function _blobencode($s) {
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$dbw = wfGetDB( DB_MASTER );
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return $dbw->encodeBlob($s);
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}
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function _blobdecode($s) {
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$dbw = wfGetDB( DB_MASTER );
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return $dbw->decodeBlob($s);
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}
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function getTableName() {
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if ( !$this->tableInitialised ) {
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$dbw = wfGetDB( DB_MASTER );
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/* This is actually a hack, we should be able
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to use Language classes here... or not */
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if (!$dbw)
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throw new MWException("Could not connect to database");
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$this->table = $dbw->tableName( $this->table );
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$this->tableInitialised = true;
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}
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return $this->table;
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}
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}
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/**
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* This is a wrapper for Turck MMCache's shared memory functions.
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*
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* You can store objects with mmcache_put() and mmcache_get(), but Turck seems
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* to use a weird custom serializer that randomly segfaults. So we wrap calls
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* with serialize()/unserialize().
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*
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* The thing I noticed about the Turck serialized data was that unlike ordinary
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* serialize(), it contained the names of methods, and judging by the amount of
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* binary data, perhaps even the bytecode of the methods themselves. It may be
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* that Turck's serializer is faster, so a possible future extension would be
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* to use it for arrays but not for objects.
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*
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*/
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class TurckBagOStuff extends BagOStuff {
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function get($key) {
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$val = mmcache_get( $key );
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if ( is_string( $val ) ) {
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$val = unserialize( $val );
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}
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return $val;
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}
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function set($key, $value, $exptime=0) {
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mmcache_put( $key, serialize( $value ), $exptime );
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return true;
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}
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function delete($key, $time=0) {
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mmcache_rm( $key );
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return true;
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}
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function lock($key, $waitTimeout = 0 ) {
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mmcache_lock( $key );
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return true;
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}
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function unlock($key) {
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mmcache_unlock( $key );
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return true;
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}
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}
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/**
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* This is a wrapper for APC's shared memory functions
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*
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*/
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class APCBagOStuff extends BagOStuff {
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function get($key) {
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$val = apc_fetch($key);
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if ( is_string( $val ) ) {
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$val = unserialize( $val );
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}
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return $val;
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}
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function set($key, $value, $exptime=0) {
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apc_store($key, serialize($value), $exptime);
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return true;
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}
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function delete($key, $time=0) {
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apc_delete($key);
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return true;
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}
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}
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/**
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* This is a wrapper for eAccelerator's shared memory functions.
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*
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* This is basically identical to the Turck MMCache version,
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* mostly because eAccelerator is based on Turck MMCache.
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*
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*/
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class eAccelBagOStuff extends BagOStuff {
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function get($key) {
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$val = eaccelerator_get( $key );
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if ( is_string( $val ) ) {
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$val = unserialize( $val );
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}
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return $val;
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}
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function set($key, $value, $exptime=0) {
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eaccelerator_put( $key, serialize( $value ), $exptime );
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return true;
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}
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function delete($key, $time=0) {
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eaccelerator_rm( $key );
|
|
return true;
|
|
}
|
|
|
|
function lock($key, $waitTimeout = 0 ) {
|
|
eaccelerator_lock( $key );
|
|
return true;
|
|
}
|
|
|
|
function unlock($key) {
|
|
eaccelerator_unlock( $key );
|
|
return true;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Wrapper for XCache object caching functions; identical interface
|
|
* to the APC wrapper
|
|
*/
|
|
class XCacheBagOStuff extends BagOStuff {
|
|
|
|
/**
|
|
* Get a value from the XCache object cache
|
|
*
|
|
* @param string $key Cache key
|
|
* @return mixed
|
|
*/
|
|
public function get( $key ) {
|
|
$val = xcache_get( $key );
|
|
if( is_string( $val ) )
|
|
$val = unserialize( $val );
|
|
return $val;
|
|
}
|
|
|
|
/**
|
|
* Store a value in the XCache object cache
|
|
*
|
|
* @param string $key Cache key
|
|
* @param mixed $value Object to store
|
|
* @param int $expire Expiration time
|
|
* @return bool
|
|
*/
|
|
public function set( $key, $value, $expire = 0 ) {
|
|
xcache_set( $key, serialize( $value ), $expire );
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* Remove a value from the XCache object cache
|
|
*
|
|
* @param string $key Cache key
|
|
* @param int $time Not used in this implementation
|
|
* @return bool
|
|
*/
|
|
public function delete( $key, $time = 0 ) {
|
|
xcache_unset( $key );
|
|
return true;
|
|
}
|
|
|
|
}
|
|
|
|
/**
|
|
* @todo document
|
|
*/
|
|
class DBABagOStuff extends BagOStuff {
|
|
var $mHandler, $mFile, $mReader, $mWriter, $mDisabled;
|
|
|
|
function __construct( $handler = 'db3', $dir = false ) {
|
|
if ( $dir === false ) {
|
|
global $wgTmpDirectory;
|
|
$dir = $wgTmpDirectory;
|
|
}
|
|
$this->mFile = "$dir/mw-cache-" . wfWikiID();
|
|
$this->mFile .= '.db';
|
|
$this->mHandler = $handler;
|
|
}
|
|
|
|
/**
|
|
* Encode value and expiry for storage
|
|
*/
|
|
function encode( $value, $expiry ) {
|
|
# Convert to absolute time
|
|
$expiry = BagOStuff::convertExpiry( $expiry );
|
|
return sprintf( '%010u', intval( $expiry ) ) . ' ' . serialize( $value );
|
|
}
|
|
|
|
/**
|
|
* @return list containing value first and expiry second
|
|
*/
|
|
function decode( $blob ) {
|
|
if ( !is_string( $blob ) ) {
|
|
return array( null, 0 );
|
|
} else {
|
|
return array(
|
|
unserialize( substr( $blob, 11 ) ),
|
|
intval( substr( $blob, 0, 10 ) )
|
|
);
|
|
}
|
|
}
|
|
|
|
function getReader() {
|
|
if ( file_exists( $this->mFile ) ) {
|
|
$handle = dba_open( $this->mFile, 'rl', $this->mHandler );
|
|
} else {
|
|
$handle = $this->getWriter();
|
|
}
|
|
if ( !$handle ) {
|
|
wfDebug( "Unable to open DBA cache file {$this->mFile}\n" );
|
|
}
|
|
return $handle;
|
|
}
|
|
|
|
function getWriter() {
|
|
$handle = dba_open( $this->mFile, 'cl', $this->mHandler );
|
|
if ( !$handle ) {
|
|
wfDebug( "Unable to open DBA cache file {$this->mFile}\n" );
|
|
}
|
|
return $handle;
|
|
}
|
|
|
|
function get( $key ) {
|
|
wfProfileIn( __METHOD__ );
|
|
wfDebug( __METHOD__."($key)\n" );
|
|
$handle = $this->getReader();
|
|
if ( !$handle ) {
|
|
return null;
|
|
}
|
|
$val = dba_fetch( $key, $handle );
|
|
list( $val, $expiry ) = $this->decode( $val );
|
|
# Must close ASAP because locks are held
|
|
dba_close( $handle );
|
|
|
|
if ( !is_null( $val ) && $expiry && $expiry < time() ) {
|
|
# Key is expired, delete it
|
|
$handle = $this->getWriter();
|
|
dba_delete( $key, $handle );
|
|
dba_close( $handle );
|
|
wfDebug( __METHOD__.": $key expired\n" );
|
|
$val = null;
|
|
}
|
|
wfProfileOut( __METHOD__ );
|
|
return $val;
|
|
}
|
|
|
|
function set( $key, $value, $exptime=0 ) {
|
|
wfProfileIn( __METHOD__ );
|
|
wfDebug( __METHOD__."($key)\n" );
|
|
$blob = $this->encode( $value, $exptime );
|
|
$handle = $this->getWriter();
|
|
if ( !$handle ) {
|
|
return false;
|
|
}
|
|
$ret = dba_replace( $key, $blob, $handle );
|
|
dba_close( $handle );
|
|
wfProfileOut( __METHOD__ );
|
|
return $ret;
|
|
}
|
|
|
|
function delete( $key, $time = 0 ) {
|
|
wfProfileIn( __METHOD__ );
|
|
wfDebug( __METHOD__."($key)\n" );
|
|
$handle = $this->getWriter();
|
|
if ( !$handle ) {
|
|
return false;
|
|
}
|
|
$ret = dba_delete( $key, $handle );
|
|
dba_close( $handle );
|
|
wfProfileOut( __METHOD__ );
|
|
return $ret;
|
|
}
|
|
|
|
function add( $key, $value, $exptime = 0 ) {
|
|
wfProfileIn( __METHOD__ );
|
|
$blob = $this->encode( $value, $exptime );
|
|
$handle = $this->getWriter();
|
|
if ( !$handle ) {
|
|
return false;
|
|
}
|
|
$ret = dba_insert( $key, $blob, $handle );
|
|
# Insert failed, check to see if it failed due to an expired key
|
|
if ( !$ret ) {
|
|
list( $value, $expiry ) = $this->decode( dba_fetch( $key, $handle ) );
|
|
if ( $expiry < time() ) {
|
|
# Yes expired, delete and try again
|
|
dba_delete( $key, $handle );
|
|
$ret = dba_insert( $key, $blob, $handle );
|
|
# This time if it failed then it will be handled by the caller like any other race
|
|
}
|
|
}
|
|
|
|
dba_close( $handle );
|
|
wfProfileOut( __METHOD__ );
|
|
return $ret;
|
|
}
|
|
|
|
function keys() {
|
|
$reader = $this->getReader();
|
|
$k1 = dba_firstkey( $reader );
|
|
if( !$k1 ) {
|
|
return array();
|
|
}
|
|
$result[] = $k1;
|
|
while( $key = dba_nextkey( $reader ) ) {
|
|
$result[] = $key;
|
|
}
|
|
return $result;
|
|
}
|
|
}
|
|
|
|
|