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https://github.com/YunoHost-Apps/mediawiki_ynh.git
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415 lines
13 KiB
PHP
415 lines
13 KiB
PHP
<?php
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/**
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* Compress the text of a wiki.
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*
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* Usage:
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*
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* Non-wikimedia
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* php compressOld.php [options...]
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*
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* Wikimedia
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* php compressOld.php <database> [options...]
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*
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* Options are:
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* -t <type> set compression type to either:
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* gzip: compress revisions independently
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* concat: concatenate revisions and compress in chunks (default)
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* -c <chunk-size> maximum number of revisions in a concat chunk
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* -b <begin-date> earliest date to check for uncompressed revisions
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* -e <end-date> latest revision date to compress
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* -s <startid> the id to start from (referring to the text table for
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* type gzip, and to the page table for type concat)
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* -n <endid> the page_id to stop at (only when using concat compression type)
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* --extdb <cluster> store specified revisions in an external cluster (untested)
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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 ExternalStorage
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*/
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require_once __DIR__ . '/../Maintenance.php';
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/**
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* Maintenance script that compress the text of a wiki.
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*
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* @ingroup Maintenance ExternalStorage
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*/
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class CompressOld extends Maintenance {
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/**
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* @todo document
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*/
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const LS_INDIVIDUAL = 0;
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const LS_CHUNKED = 1;
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public function __construct() {
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parent::__construct();
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$this->mDescription = 'Compress the text of a wiki';
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$this->addOption( 'type', 'Set compression type to either: gzip|concat', false, true, 't' );
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$this->addOption( 'chunksize', 'Maximum number of revisions in a concat chunk', false, true, 'c' );
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$this->addOption( 'begin-date', 'Earliest date to check for uncompressed revisions', false, true, 'b' );
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$this->addOption( 'end-date', 'Latest revision date to compress', false, true, 'e' );
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$this->addOption( 'startid', 'The id to start from (gzip -> text table, concat -> page table)', false, true, 's' );
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$this->addOption( 'extdb', 'Store specified revisions in an external cluster (untested)', false, true );
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$this->addOption( 'endid', 'The page_id to stop at (only when using concat compression type)', false, true, 'n' );
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}
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public function execute() {
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global $wgDBname;
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if ( !function_exists( "gzdeflate" ) ) {
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$this->error( "You must enable zlib support in PHP to compress old revisions!\n" .
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"Please see http://www.php.net/manual/en/ref.zlib.php\n", true );
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}
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$type = $this->getOption( 'type', 'concat' );
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$chunkSize = $this->getOption( 'chunksize', 20 );
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$startId = $this->getOption( 'startid', 0 );
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$beginDate = $this->getOption( 'begin-date', '' );
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$endDate = $this->getOption( 'end-date', '' );
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$extDB = $this->getOption( 'extdb', '' );
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$endId = $this->getOption( 'endid', false );
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if ( $type != 'concat' && $type != 'gzip' ) {
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$this->error( "Type \"{$type}\" not supported" );
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}
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if ( $extDB != '' ) {
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$this->output( "Compressing database {$wgDBname} to external cluster {$extDB}\n"
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. str_repeat( '-', 76 ) . "\n\n" );
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} else {
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$this->output( "Compressing database {$wgDBname}\n"
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. str_repeat( '-', 76 ) . "\n\n" );
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}
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$success = true;
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if ( $type == 'concat' ) {
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$success = $this->compressWithConcat( $startId, $chunkSize, $beginDate,
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$endDate, $extDB, $endId );
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} else {
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$this->compressOldPages( $startId, $extDB );
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}
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if ( $success ) {
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$this->output( "Done.\n" );
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}
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}
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/** @todo document */
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private function compressOldPages( $start = 0, $extdb = '' ) {
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$chunksize = 50;
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$this->output( "Starting from old_id $start...\n" );
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$dbw = wfGetDB( DB_MASTER );
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do {
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$res = $dbw->select( 'text', array( 'old_id', 'old_flags', 'old_text' ),
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"old_id>=$start", __METHOD__, array( 'ORDER BY' => 'old_id', 'LIMIT' => $chunksize, 'FOR UPDATE' ) );
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if ( $res->numRows() == 0 ) {
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break;
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}
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$last = $start;
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foreach ( $res as $row ) {
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# print " {$row->old_id} - {$row->old_namespace}:{$row->old_title}\n";
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$this->compressPage( $row, $extdb );
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$last = $row->old_id;
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}
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$start = $last + 1; # Deletion may leave long empty stretches
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$this->output( "$start...\n" );
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} while ( true );
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}
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/**
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* @todo document
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* @param $row
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* @param $extdb
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* @return bool
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*/
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private function compressPage( $row, $extdb ) {
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if ( false !== strpos( $row->old_flags, 'gzip' ) || false !== strpos( $row->old_flags, 'object' ) ) {
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#print "Already compressed row {$row->old_id}\n";
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return false;
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}
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$dbw = wfGetDB( DB_MASTER );
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$flags = $row->old_flags ? "{$row->old_flags},gzip" : "gzip";
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$compress = gzdeflate( $row->old_text );
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# Store in external storage if required
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if ( $extdb !== '' ) {
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$storeObj = new ExternalStoreDB;
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$compress = $storeObj->store( $extdb, $compress );
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if ( $compress === false ) {
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$this->error( "Unable to store object" );
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return false;
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}
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}
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# Update text row
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$dbw->update( 'text',
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array( /* SET */
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'old_flags' => $flags,
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'old_text' => $compress
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), array( /* WHERE */
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'old_id' => $row->old_id
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), __METHOD__,
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array( 'LIMIT' => 1 )
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);
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return true;
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}
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/**
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* @param $startId
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* @param $maxChunkSize
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* @param $beginDate
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* @param $endDate
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* @param $extdb string
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* @param $maxPageId bool|int
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* @return bool
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*/
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private function compressWithConcat( $startId, $maxChunkSize, $beginDate,
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$endDate, $extdb = "", $maxPageId = false )
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{
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$loadStyle = self::LS_CHUNKED;
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$dbr = wfGetDB( DB_SLAVE );
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$dbw = wfGetDB( DB_MASTER );
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# Set up external storage
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if ( $extdb != '' ) {
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$storeObj = new ExternalStoreDB;
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}
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# Get all articles by page_id
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if ( !$maxPageId ) {
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$maxPageId = $dbr->selectField( 'page', 'max(page_id)', '', __METHOD__ );
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}
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$this->output( "Starting from $startId of $maxPageId\n" );
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$pageConds = array();
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/*
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if ( $exclude_ns0 ) {
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print "Excluding main namespace\n";
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$pageConds[] = 'page_namespace<>0';
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}
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if ( $queryExtra ) {
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$pageConds[] = $queryExtra;
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}
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*/
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# For each article, get a list of revisions which fit the criteria
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# No recompression, use a condition on old_flags
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# Don't compress object type entities, because that might produce data loss when
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# overwriting bulk storage concat rows. Don't compress external references, because
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# the script doesn't yet delete rows from external storage.
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$conds = array(
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'old_flags NOT ' . $dbr->buildLike( $dbr->anyString(), 'object', $dbr->anyString() ) . ' AND old_flags NOT '
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. $dbr->buildLike( $dbr->anyString(), 'external', $dbr->anyString() ) );
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if ( $beginDate ) {
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if ( !preg_match( '/^\d{14}$/', $beginDate ) ) {
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$this->error( "Invalid begin date \"$beginDate\"\n" );
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return false;
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}
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$conds[] = "rev_timestamp>'" . $beginDate . "'";
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}
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if ( $endDate ) {
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if ( !preg_match( '/^\d{14}$/', $endDate ) ) {
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$this->error( "Invalid end date \"$endDate\"\n" );
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return false;
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}
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$conds[] = "rev_timestamp<'" . $endDate . "'";
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}
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if ( $loadStyle == self::LS_CHUNKED ) {
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$tables = array( 'revision', 'text' );
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$fields = array( 'rev_id', 'rev_text_id', 'old_flags', 'old_text' );
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$conds[] = 'rev_text_id=old_id';
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$revLoadOptions = 'FOR UPDATE';
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} else {
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$tables = array( 'revision' );
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$fields = array( 'rev_id', 'rev_text_id' );
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$revLoadOptions = array();
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}
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# Don't work with current revisions
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# Don't lock the page table for update either -- TS 2006-04-04
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#$tables[] = 'page';
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#$conds[] = 'page_id=rev_page AND rev_id != page_latest';
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for ( $pageId = $startId; $pageId <= $maxPageId; $pageId++ ) {
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wfWaitForSlaves();
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# Wake up
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$dbr->ping();
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# Get the page row
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$pageRes = $dbr->select( 'page',
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array( 'page_id', 'page_namespace', 'page_title', 'page_latest' ),
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$pageConds + array( 'page_id' => $pageId ), __METHOD__ );
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if ( $pageRes->numRows() == 0 ) {
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continue;
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}
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$pageRow = $dbr->fetchObject( $pageRes );
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# Display progress
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$titleObj = Title::makeTitle( $pageRow->page_namespace, $pageRow->page_title );
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$this->output( "$pageId\t" . $titleObj->getPrefixedDBkey() . " " );
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# Load revisions
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$revRes = $dbw->select( $tables, $fields,
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array_merge( array(
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'rev_page' => $pageRow->page_id,
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# Don't operate on the current revision
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# Use < instead of <> in case the current revision has changed
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# since the page select, which wasn't locking
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'rev_id < ' . $pageRow->page_latest
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), $conds ),
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__METHOD__,
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$revLoadOptions
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);
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$revs = array();
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foreach ( $revRes as $revRow ) {
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$revs[] = $revRow;
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}
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if ( count( $revs ) < 2 ) {
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# No revisions matching, no further processing
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$this->output( "\n" );
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continue;
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}
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# For each chunk
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$i = 0;
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while ( $i < count( $revs ) ) {
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if ( $i < count( $revs ) - $maxChunkSize ) {
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$thisChunkSize = $maxChunkSize;
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} else {
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$thisChunkSize = count( $revs ) - $i;
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}
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$chunk = new ConcatenatedGzipHistoryBlob();
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$stubs = array();
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$dbw->begin( __METHOD__ );
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$usedChunk = false;
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$primaryOldid = $revs[$i]->rev_text_id;
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# Get the text of each revision and add it to the object
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for ( $j = 0; $j < $thisChunkSize && $chunk->isHappy(); $j++ ) {
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$oldid = $revs[$i + $j]->rev_text_id;
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# Get text
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if ( $loadStyle == self::LS_INDIVIDUAL ) {
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$textRow = $dbw->selectRow( 'text',
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array( 'old_flags', 'old_text' ),
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array( 'old_id' => $oldid ),
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__METHOD__,
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'FOR UPDATE'
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);
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$text = Revision::getRevisionText( $textRow );
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} else {
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$text = Revision::getRevisionText( $revs[$i + $j] );
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}
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if ( $text === false ) {
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$this->error( "\nError, unable to get text in old_id $oldid" );
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#$dbw->delete( 'old', array( 'old_id' => $oldid ) );
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}
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if ( $extdb == "" && $j == 0 ) {
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$chunk->setText( $text );
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$this->output( '.' );
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} else {
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# Don't make a stub if it's going to be longer than the article
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# Stubs are typically about 100 bytes
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if ( strlen( $text ) < 120 ) {
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$stub = false;
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$this->output( 'x' );
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} else {
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$stub = new HistoryBlobStub( $chunk->addItem( $text ) );
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$stub->setLocation( $primaryOldid );
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$stub->setReferrer( $oldid );
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$this->output( '.' );
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$usedChunk = true;
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}
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$stubs[$j] = $stub;
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}
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}
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$thisChunkSize = $j;
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# If we couldn't actually use any stubs because the pages were too small, do nothing
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if ( $usedChunk ) {
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if ( $extdb != "" ) {
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# Move blob objects to External Storage
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$stored = $storeObj->store( $extdb, serialize( $chunk ));
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if ( $stored === false ) {
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$this->error( "Unable to store object" );
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return false;
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}
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# Store External Storage URLs instead of Stub placeholders
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foreach ( $stubs as $stub ) {
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if ( $stub === false ) {
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continue;
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}
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# $stored should provide base path to a BLOB
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$url = $stored . "/" . $stub->getHash();
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$dbw->update( 'text',
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array( /* SET */
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'old_text' => $url,
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'old_flags' => 'external,utf-8',
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), array( /* WHERE */
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'old_id' => $stub->getReferrer(),
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)
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);
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}
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} else {
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# Store the main object locally
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$dbw->update( 'text',
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array( /* SET */
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'old_text' => serialize( $chunk ),
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'old_flags' => 'object,utf-8',
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), array( /* WHERE */
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'old_id' => $primaryOldid
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)
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);
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# Store the stub objects
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for ( $j = 1; $j < $thisChunkSize; $j++ ) {
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# Skip if not compressing and don't overwrite the first revision
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if ( $stubs[$j] !== false && $revs[$i + $j]->rev_text_id != $primaryOldid ) {
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$dbw->update( 'text',
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array( /* SET */
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'old_text' => serialize( $stubs[$j] ),
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'old_flags' => 'object,utf-8',
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), array( /* WHERE */
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'old_id' => $revs[$i + $j]->rev_text_id
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)
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);
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}
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}
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}
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}
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# Done, next
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$this->output( "/" );
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$dbw->commit( __METHOD__ );
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$i += $thisChunkSize;
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wfWaitForSlaves();
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}
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$this->output( "\n" );
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}
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return true;
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}
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}
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$maintClass = 'CompressOld';
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require_once RUN_MAINTENANCE_IF_MAIN;
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