2708a82ea0
For use in the checkStorage and resolveStubs maintenance scripts, in order to fix them. Follows-Up: Id1f530c2c8ec1171615f726dc7446431ee7ca8fe Change-Id: Iade3d1660f2b7db62f829f5e5ca94372614ae7e5
161 lines
4 KiB
PHP
161 lines
4 KiB
PHP
<?php
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/**
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* Efficient concatenated text storage.
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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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* @file
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*/
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use MediaWiki\MediaWikiServices;
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/**
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* Pointer object for an item within a CGZ blob stored in the text table.
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*/
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class HistoryBlobStub {
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/**
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* @var array One-step cache variable to hold base blobs; operations that
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* pull multiple revisions may often pull multiple times from the same
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* blob. By keeping the last-used one open, we avoid redundant
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* unserialization and decompression overhead.
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*/
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protected static $blobCache = [];
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/** @var int */
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protected $mOldId;
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/** @var string */
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protected $mHash;
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/** @var string */
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protected $mRef;
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/**
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* @param string $hash The content hash of the text
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* @param int $oldid The old_id for the CGZ object
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*/
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public function __construct( $hash = '', $oldid = 0 ) {
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$this->mHash = $hash;
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}
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/**
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* Sets the location (old_id) of the main object to which this object
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* points
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* @param int $id
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*/
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public function setLocation( $id ) {
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$this->mOldId = $id;
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}
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/**
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* Gets the location of the main object
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* @return int
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*/
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public function getLocation() {
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return $this->mOldId;
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}
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/**
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* Sets the location (old_id) of the referring object
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* @param string $id
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*/
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public function setReferrer( $id ) {
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$this->mRef = $id;
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}
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/**
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* Gets the location of the referring object
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* @return string
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*/
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public function getReferrer() {
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return $this->mRef;
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}
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/**
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* @return string|false
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*/
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public function getText() {
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if ( isset( self::$blobCache[$this->mOldId] ) ) {
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$obj = self::$blobCache[$this->mOldId];
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} else {
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$dbr = wfGetDB( DB_REPLICA );
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$row = $dbr->selectRow(
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'text',
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[ 'old_flags', 'old_text' ],
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[ 'old_id' => $this->mOldId ],
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__METHOD__
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);
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if ( !$row ) {
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return false;
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}
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$flags = explode( ',', $row->old_flags );
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if ( in_array( 'external', $flags ) ) {
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$url = $row->old_text;
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$parts = explode( '://', $url, 2 );
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if ( !isset( $parts[1] ) || $parts[1] == '' ) {
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return false;
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}
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$row->old_text = MediaWikiServices::getInstance()
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->getExternalStoreAccess()
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->fetchFromURL( $url );
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}
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if ( !in_array( 'object', $flags ) ) {
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return false;
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}
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if ( in_array( 'gzip', $flags ) ) {
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// This shouldn't happen, but a bug in the compress script
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// may at times gzip-compress a HistoryBlob object row.
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$obj = unserialize( gzinflate( $row->old_text ) );
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} else {
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$obj = unserialize( $row->old_text );
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}
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if ( !is_object( $obj ) ) {
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// Correct for old double-serialization bug.
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$obj = unserialize( $obj );
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}
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// Save this item for reference; if pulling many
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// items in a row we'll likely use it again.
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$obj->uncompress();
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self::$blobCache = [ $this->mOldId => $obj ];
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}
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return $obj->getItem( $this->mHash );
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}
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/**
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* Get the content hash
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*
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* @return string
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*/
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public function getHash() {
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return $this->mHash;
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}
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}
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// Blobs generated by MediaWiki < 1.5 on PHP 4 were serialized with the
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// class name coerced to lowercase. We can improve efficiency by adding
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// autoload entries for the lowercase variants of these classes (T166759).
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// The code below is never executed, but it is picked up by the AutoloadGenerator
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// parser, which scans for class_alias() calls.
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/*
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class_alias( HistoryBlobStub::class, 'historyblobstub' );
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*/
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