666 lines
20 KiB
PHP
666 lines
20 KiB
PHP
<?php
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/**
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* Script that postprocesses XML dumps from dumpBackup.php to add page text
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*
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* Copyright (C) 2005 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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* @file
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* @ingroup Maintenance
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*/
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$originalDir = getcwd();
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require_once( dirname( __FILE__ ) . '/commandLine.inc' );
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require_once( 'backup.inc' );
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/**
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* @ingroup Maintenance
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*/
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class TextPassDumper extends BackupDumper {
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var $prefetch = null;
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var $input = "php://stdin";
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var $history = WikiExporter::FULL;
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var $fetchCount = 0;
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var $prefetchCount = 0;
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var $prefetchCountLast = 0;
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var $fetchCountLast = 0;
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var $failures = 0;
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var $maxFailures = 5;
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var $failedTextRetrievals = 0;
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var $maxConsecutiveFailedTextRetrievals = 200;
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var $failureTimeout = 5; // Seconds to sleep after db failure
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var $php = "php";
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var $spawn = false;
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var $spawnProc = false;
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var $spawnWrite = false;
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var $spawnRead = false;
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var $spawnErr = false;
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var $xmlwriterobj = false;
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// when we spend more than maxTimeAllowed seconds on this run, we continue
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// processing until we write out the next complete page, then save output file(s),
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// rename it/them and open new one(s)
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var $maxTimeAllowed = 0; // 0 = no limit
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var $timeExceeded = false;
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var $firstPageWritten = false;
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var $lastPageWritten = false;
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var $checkpointJustWritten = false;
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var $checkpointFiles = array();
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function initProgress( $history ) {
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parent::initProgress();
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$this->timeOfCheckpoint = $this->startTime;
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}
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function dump( $history, $text = WikiExporter::TEXT ) {
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// This shouldn't happen if on console... ;)
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header( 'Content-type: text/html; charset=UTF-8' );
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// Notice messages will foul up your XML output even if they're
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// relatively harmless.
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if ( ini_get( 'display_errors' ) )
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ini_set( 'display_errors', 'stderr' );
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$this->initProgress( $this->history );
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$this->db = $this->backupDb();
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$this->egress = new ExportProgressFilter( $this->sink, $this );
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// it would be nice to do it in the constructor, oh well. need egress set
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$this->finalOptionCheck();
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// we only want this so we know how to close a stream :-P
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$this->xmlwriterobj = new XmlDumpWriter();
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$input = fopen( $this->input, "rt" );
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$result = $this->readDump( $input );
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if ( WikiError::isError( $result ) ) {
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throw new MWException( $result->getMessage() );
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}
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if ( $this->spawnProc ) {
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$this->closeSpawn();
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}
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$this->report( true );
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}
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function processOption( $opt, $val, $param ) {
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global $IP;
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$url = $this->processFileOpt( $val, $param );
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switch( $opt ) {
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case 'prefetch':
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require_once "$IP/maintenance/backupPrefetch.inc";
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$this->prefetch = new BaseDump( $url );
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break;
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case 'stub':
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$this->input = $url;
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break;
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case 'maxtime':
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$this->maxTimeAllowed = intval($val)*60;
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break;
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case 'checkpointfile':
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$this->checkpointFiles[] = $val;
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break;
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case 'current':
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$this->history = WikiExporter::CURRENT;
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break;
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case 'full':
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$this->history = WikiExporter::FULL;
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break;
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case 'spawn':
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$this->spawn = true;
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if ( $val ) {
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$this->php = $val;
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}
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break;
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}
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}
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function processFileOpt( $val, $param ) {
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$fileURIs = explode(';',$param);
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foreach ( $fileURIs as $URI ) {
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switch( $val ) {
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case "file":
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$newURI = $URI;
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break;
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case "gzip":
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$newURI = "compress.zlib://$URI";
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break;
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case "bzip2":
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$newURI = "compress.bzip2://$URI";
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break;
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case "7zip":
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$newURI = "mediawiki.compress.7z://$URI";
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break;
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default:
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$newURI = $URI;
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}
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$newFileURIs[] = $newURI;
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}
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$val = implode( ';', $newFileURIs );
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return $val;
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}
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/**
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* Overridden to include prefetch ratio if enabled.
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*/
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function showReport() {
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if ( !$this->prefetch ) {
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return parent::showReport();
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}
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if ( $this->reporting ) {
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$now = wfTimestamp( TS_DB );
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$nowts = wfTime();
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$deltaAll = wfTime() - $this->startTime;
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$deltaPart = wfTime() - $this->lastTime;
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$this->pageCountPart = $this->pageCount - $this->pageCountLast;
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$this->revCountPart = $this->revCount - $this->revCountLast;
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if ( $deltaAll ) {
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$portion = $this->revCount / $this->maxCount;
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$eta = $this->startTime + $deltaAll / $portion;
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$etats = wfTimestamp( TS_DB, intval( $eta ) );
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if ( $this->fetchCount ) {
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$fetchRate = 100.0 * $this->prefetchCount / $this->fetchCount;
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}
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else {
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$fetchRate = '-';
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}
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$pageRate = $this->pageCount / $deltaAll;
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$revRate = $this->revCount / $deltaAll;
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} else {
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$pageRate = '-';
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$revRate = '-';
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$etats = '-';
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$fetchRate = '-';
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}
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if ( $deltaPart ) {
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if ( $this->fetchCountLast ) {
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$fetchRatePart = 100.0 * $this->prefetchCountLast / $this->fetchCountLast;
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}
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else {
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$fetchRatePart = '-';
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}
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$pageRatePart = $this->pageCountPart / $deltaPart;
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$revRatePart = $this->revCountPart / $deltaPart;
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} else {
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$fetchRatePart = '-';
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$pageRatePart = '-';
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$revRatePart = '-';
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}
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$this->progress( sprintf( "%s: %s (ID %d) %d pages (%0.1f|%0.1f/sec all|curr), %d revs (%0.1f|%0.1f/sec all|curr), %0.1f%%|%0.1f%% prefetched (all|curr), ETA %s [max %d]",
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$now, wfWikiID(), $this->ID, $this->pageCount, $pageRate, $pageRatePart, $this->revCount, $revRate, $revRatePart, $fetchRate, $fetchRatePart, $etats, $this->maxCount ) );
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$this->lastTime = $nowts;
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$this->revCountLast = $this->revCount;
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$this->prefetchCountLast = $this->prefetchCount;
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$this->fetchCountLast = $this->fetchCount;
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}
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}
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function setTimeExceeded() {
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$this->timeExceeded = True;
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}
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function checkIfTimeExceeded() {
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if ( $this->maxTimeAllowed && ( $this->lastTime - $this->timeOfCheckpoint > $this->maxTimeAllowed ) ) {
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return True;
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}
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return False;
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}
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function finalOptionCheck() {
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if ( ( $this->checkpointFiles && ! $this->maxTimeAllowed ) ||
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( $this->maxTimeAllowed && !$this->checkpointFiles ) ) {
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throw new MWException("Options checkpointfile and maxtime must be specified together.\n");
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}
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foreach ($this->checkpointFiles as $checkpointFile) {
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$count = substr_count ( $checkpointFile,"%s" );
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if ( $count != 2 ) {
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throw new MWException("Option checkpointfile must contain two '%s' for substitution of first and last pageids, count is $count instead, file is $checkpointFile.\n");
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}
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}
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if ( $this->checkpointFiles ) {
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$filenameList = (array)$this->egress->getFilename();
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if ( count( $filenameList ) != count( $this->checkpointFiles ) ) {
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throw new MWException("One checkpointfile must be specified for each output option, if maxtime is used.\n");
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}
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}
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}
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function readDump( $input ) {
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$this->buffer = "";
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$this->openElement = false;
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$this->atStart = true;
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$this->state = "";
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$this->lastName = "";
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$this->thisPage = 0;
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$this->thisRev = 0;
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$parser = xml_parser_create( "UTF-8" );
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xml_parser_set_option( $parser, XML_OPTION_CASE_FOLDING, false );
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xml_set_element_handler( $parser, array( &$this, 'startElement' ), array( &$this, 'endElement' ) );
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xml_set_character_data_handler( $parser, array( &$this, 'characterData' ) );
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$offset = 0; // for context extraction on error reporting
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$bufferSize = 512 * 1024;
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do {
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if ($this->checkIfTimeExceeded()) {
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$this->setTimeExceeded();
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}
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$chunk = fread( $input, $bufferSize );
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if ( !xml_parse( $parser, $chunk, feof( $input ) ) ) {
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wfDebug( "TextDumpPass::readDump encountered XML parsing error\n" );
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return new WikiXmlError( $parser, 'XML import parse failure', $chunk, $offset );
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}
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$offset += strlen( $chunk );
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} while ( $chunk !== false && !feof( $input ) );
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if ($this->maxTimeAllowed) {
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$filenameList = (array)$this->egress->getFilename();
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// we wrote some stuff after last checkpoint that needs renamed
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if (file_exists($filenameList[0])) {
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$newFilenames = array();
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$firstPageID = str_pad($this->firstPageWritten,9,"0",STR_PAD_LEFT);
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$lastPageID = str_pad($this->lastPageWritten,9,"0",STR_PAD_LEFT);
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for ( $i = 0; $i < count( $filenameList ); $i++ ) {
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$checkpointNameFilledIn = sprintf( $this->checkpointFiles[$i], $firstPageID, $lastPageID );
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$fileinfo = pathinfo($filenameList[$i]);
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$newFilenames[] = $fileinfo['dirname'] . '/' . $checkpointNameFilledIn;
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}
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$this->egress->closeAndRename( $newFilenames );
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}
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}
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xml_parser_free( $parser );
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return true;
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}
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function getText( $id ) {
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$this->fetchCount++;
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if ( isset( $this->prefetch ) ) {
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$text = $this->prefetch->prefetch( $this->thisPage, $this->thisRev );
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if ( $text !== null ) { // Entry missing from prefetch dump
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$dbr = wfGetDB( DB_SLAVE );
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$revID = intval( $this->thisRev );
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$revLength = $dbr->selectField( 'revision', 'rev_len', array( 'rev_id' => $revID ) );
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// if length of rev text in file doesn't match length in db, we reload
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// this avoids carrying forward broken data from previous xml dumps
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if( strlen( $text ) == $revLength ) {
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$this->prefetchCount++;
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return $text;
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}
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}
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}
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return $this->doGetText( $id );
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}
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private function doGetText( $id ) {
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$id = intval( $id );
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$this->failures = 0;
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$ex = new MWException( "Graceful storage failure" );
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while (true) {
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if ( $this->spawn ) {
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if ($this->failures) {
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// we don't know why it failed, could be the child process
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// borked, could be db entry busted, could be db server out to lunch,
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// so cover all bases
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$this->closeSpawn();
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$this->openSpawn();
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}
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$text = $this->getTextSpawned( $id );
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} else {
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$text = $this->getTextDbSafe( $id );
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}
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if ( $text === false ) {
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$this->failures++;
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if ( $this->failures > $this->maxFailures) {
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$this->progress( "Failed to retrieve revision text for text id ".
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"$id after $this->maxFailures tries, giving up" );
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// were there so many bad retrievals in a row we want to bail?
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// at some point we have to declare the dump irretrievably broken
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$this->failedTextRetrievals++;
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if ($this->failedTextRetrievals > $this->maxConsecutiveFailedTextRetrievals) {
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throw $ex;
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}
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else {
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// would be nice to return something better to the caller someday,
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// log what we know about the failure and about the revision
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return("");
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}
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} else {
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$this->progress( "Error $this->failures " .
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"of allowed $this->maxFailures retrieving revision text for text id $id! " .
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"Pausing $this->failureTimeout seconds before retry..." );
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sleep( $this->failureTimeout );
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}
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} else {
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$this->failedTextRetrievals= 0;
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return( $text );
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}
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}
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}
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/**
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* Fetch a text revision from the database, retrying in case of failure.
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* This may survive some transitory errors by reconnecting, but
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* may not survive a long-term server outage.
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*/
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private function getTextDbSafe( $id ) {
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while ( true ) {
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try {
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$text = $this->getTextDb( $id );
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} catch ( DBQueryError $ex ) {
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$text = false;
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}
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return $text;
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}
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}
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/**
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* May throw a database error if, say, the server dies during query.
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*/
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private function getTextDb( $id ) {
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global $wgContLang;
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$row = $this->db->selectRow( 'text',
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array( 'old_text', 'old_flags' ),
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array( 'old_id' => $id ),
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__METHOD__ );
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$text = Revision::getRevisionText( $row );
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if ( $text === false ) {
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return false;
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}
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$stripped = str_replace( "\r", "", $text );
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$normalized = $wgContLang->normalize( $stripped );
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return $normalized;
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}
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private function getTextSpawned( $id ) {
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wfSuppressWarnings();
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if ( !$this->spawnProc ) {
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// First time?
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$this->openSpawn();
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}
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$text = $this->getTextSpawnedOnce( $id );
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wfRestoreWarnings();
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return $text;
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}
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function openSpawn() {
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global $IP;
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$cmd = implode( " ",
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array_map( 'wfEscapeShellArg',
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array(
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$this->php,
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"$IP/maintenance/fetchText.php",
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'--wiki', wfWikiID() ) ) );
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$spec = array(
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0 => array( "pipe", "r" ),
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1 => array( "pipe", "w" ),
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2 => array( "file", "/dev/null", "a" ) );
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$pipes = array();
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$this->progress( "Spawning database subprocess: $cmd" );
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$this->spawnProc = proc_open( $cmd, $spec, $pipes );
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if ( !$this->spawnProc ) {
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// shit
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$this->progress( "Subprocess spawn failed." );
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return false;
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}
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list(
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$this->spawnWrite, // -> stdin
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$this->spawnRead, // <- stdout
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) = $pipes;
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return true;
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}
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private function closeSpawn() {
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wfSuppressWarnings();
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if ( $this->spawnRead )
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fclose( $this->spawnRead );
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$this->spawnRead = false;
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if ( $this->spawnWrite )
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fclose( $this->spawnWrite );
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$this->spawnWrite = false;
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if ( $this->spawnErr )
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fclose( $this->spawnErr );
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$this->spawnErr = false;
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if ( $this->spawnProc )
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pclose( $this->spawnProc );
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$this->spawnProc = false;
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wfRestoreWarnings();
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}
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private function getTextSpawnedOnce( $id ) {
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global $wgContLang;
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$ok = fwrite( $this->spawnWrite, "$id\n" );
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// $this->progress( ">> $id" );
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if ( !$ok ) return false;
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$ok = fflush( $this->spawnWrite );
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// $this->progress( ">> [flush]" );
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if ( !$ok ) return false;
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// check that the text id they are sending is the one we asked for
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// this avoids out of sync revision text errors we have encountered in the past
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$newId = fgets( $this->spawnRead );
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if ( $newId === false ) {
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return false;
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}
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if ( $id != intval( $newId ) ) {
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return false;
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}
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$len = fgets( $this->spawnRead );
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// $this->progress( "<< " . trim( $len ) );
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if ( $len === false ) return false;
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$nbytes = intval( $len );
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// actual error, not zero-length text
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if ($nbytes < 0 ) return false;
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$text = "";
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// Subprocess may not send everything at once, we have to loop.
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while ( $nbytes > strlen( $text ) ) {
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$buffer = fread( $this->spawnRead, $nbytes - strlen( $text ) );
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if ( $buffer === false ) break;
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$text .= $buffer;
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}
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$gotbytes = strlen( $text );
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if ( $gotbytes != $nbytes ) {
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$this->progress( "Expected $nbytes bytes from database subprocess, got $gotbytes " );
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return false;
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}
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// Do normalization in the dump thread...
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|
$stripped = str_replace( "\r", "", $text );
|
|
$normalized = $wgContLang->normalize( $stripped );
|
|
return $normalized;
|
|
}
|
|
|
|
function startElement( $parser, $name, $attribs ) {
|
|
$this->checkpointJustWritten = false;
|
|
|
|
$this->clearOpenElement( null );
|
|
$this->lastName = $name;
|
|
|
|
if ( $name == 'revision' ) {
|
|
$this->state = $name;
|
|
$this->egress->writeOpenPage( null, $this->buffer );
|
|
$this->buffer = "";
|
|
} elseif ( $name == 'page' ) {
|
|
$this->state = $name;
|
|
if ( $this->atStart ) {
|
|
$this->egress->writeOpenStream( $this->buffer );
|
|
$this->buffer = "";
|
|
$this->atStart = false;
|
|
}
|
|
}
|
|
|
|
if ( $name == "text" && isset( $attribs['id'] ) ) {
|
|
$text = $this->getText( $attribs['id'] );
|
|
$this->openElement = array( $name, array( 'xml:space' => 'preserve' ) );
|
|
if ( strlen( $text ) > 0 ) {
|
|
$this->characterData( $parser, $text );
|
|
}
|
|
} else {
|
|
$this->openElement = array( $name, $attribs );
|
|
}
|
|
}
|
|
|
|
function endElement( $parser, $name ) {
|
|
$this->checkpointJustWritten = false;
|
|
|
|
if ( $this->openElement ) {
|
|
$this->clearOpenElement( "" );
|
|
} else {
|
|
$this->buffer .= "</$name>";
|
|
}
|
|
|
|
if ( $name == 'revision' ) {
|
|
$this->egress->writeRevision( null, $this->buffer );
|
|
$this->buffer = "";
|
|
$this->thisRev = "";
|
|
} elseif ( $name == 'page' ) {
|
|
if (! $this->firstPageWritten) {
|
|
$this->firstPageWritten = trim($this->thisPage);
|
|
}
|
|
$this->lastPageWritten = trim($this->thisPage);
|
|
if ($this->timeExceeded) {
|
|
$this->egress->writeClosePage( $this->buffer );
|
|
// nasty hack, we can't just write the chardata after the
|
|
// page tag, it will include leading blanks from the next line
|
|
$this->egress->sink->write("\n");
|
|
|
|
$this->buffer = $this->xmlwriterobj->closeStream();
|
|
$this->egress->writeCloseStream( $this->buffer );
|
|
|
|
$this->buffer = "";
|
|
$this->thisPage = "";
|
|
// this could be more than one file if we had more than one output arg
|
|
$checkpointFilenames = array();
|
|
$filenameList = (array)$this->egress->getFilename();
|
|
$newFilenames = array();
|
|
$firstPageID = str_pad($this->firstPageWritten,9,"0",STR_PAD_LEFT);
|
|
$lastPageID = str_pad($this->lastPageWritten,9,"0",STR_PAD_LEFT);
|
|
for ( $i = 0; $i < count( $filenameList ); $i++ ) {
|
|
$checkpointNameFilledIn = sprintf( $this->checkpointFiles[$i], $firstPageID, $lastPageID );
|
|
$fileinfo = pathinfo($filenameList[$i]);
|
|
$newFilenames[] = $fileinfo['dirname'] . '/' . $checkpointNameFilledIn;
|
|
}
|
|
$this->egress->closeRenameAndReopen( $newFilenames );
|
|
$this->buffer = $this->xmlwriterobj->openStream();
|
|
$this->timeExceeded = false;
|
|
$this->timeOfCheckpoint = $this->lastTime;
|
|
$this->firstPageWritten = false;
|
|
$this->checkpointJustWritten = true;
|
|
}
|
|
else {
|
|
$this->egress->writeClosePage( $this->buffer );
|
|
$this->buffer = "";
|
|
$this->thisPage = "";
|
|
}
|
|
|
|
} elseif ( $name == 'mediawiki' ) {
|
|
$this->egress->writeCloseStream( $this->buffer );
|
|
$this->buffer = "";
|
|
}
|
|
}
|
|
|
|
function characterData( $parser, $data ) {
|
|
$this->clearOpenElement( null );
|
|
if ( $this->lastName == "id" ) {
|
|
if ( $this->state == "revision" ) {
|
|
$this->thisRev .= $data;
|
|
} elseif ( $this->state == "page" ) {
|
|
$this->thisPage .= $data;
|
|
}
|
|
}
|
|
// have to skip the newline left over from closepagetag line of
|
|
// end of checkpoint files. nasty hack!!
|
|
if ($this->checkpointJustWritten) {
|
|
if ($data[0] == "\n") {
|
|
$data = substr($data,1);
|
|
}
|
|
$this->checkpointJustWritten = false;
|
|
}
|
|
$this->buffer .= htmlspecialchars( $data );
|
|
}
|
|
|
|
function clearOpenElement( $style ) {
|
|
if ( $this->openElement ) {
|
|
$this->buffer .= Xml::element( $this->openElement[0], $this->openElement[1], $style );
|
|
$this->openElement = false;
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
$dumper = new TextPassDumper( $argv );
|
|
|
|
if ( !isset( $options['help'] ) ) {
|
|
$dumper->dump( true );
|
|
} else {
|
|
$dumper->progress( <<<ENDS
|
|
This script postprocesses XML dumps from dumpBackup.php to add
|
|
page text which was stubbed out (using --stub).
|
|
|
|
XML input is accepted on stdin.
|
|
XML output is sent to stdout; progress reports are sent to stderr.
|
|
|
|
Usage: php dumpTextPass.php [<options>]
|
|
Options:
|
|
--stub=<type>:<file> To load a compressed stub dump instead of stdin
|
|
--prefetch=<type>:<file> Use a prior dump file as a text source, to save
|
|
pressure on the database.
|
|
(Requires the XMLReader extension)
|
|
--maxtime=<minutes> Write out checkpoint file after this many minutes (writing
|
|
out complete page, closing xml file properly, and opening new one
|
|
with header). This option requires the checkpointfile option.
|
|
--checkpointfile=<filenamepattern> Use this string for checkpoint filenames,
|
|
substituting first pageid written for the first %s (required) and the
|
|
last pageid written for the second %s if it exists.
|
|
--quiet Don't dump status reports to stderr.
|
|
--report=n Report position and speed after every n pages processed.
|
|
(Default: 100)
|
|
--server=h Force reading from MySQL server h
|
|
--current Base ETA on number of pages in database instead of all revisions
|
|
--spawn Spawn a subprocess for loading text records
|
|
--help Display this help message
|
|
ENDS
|
|
);
|
|
}
|
|
|
|
|