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<?php
/**
* Compress the text of a wiki.
*
* Usage:
*
* Non-wikimedia
* php compressOld.php [options...]
*
* Wikimedia
* php compressOld.php <database> [options...]
*
* Options are:
* -t <type> set compression type to either:
* gzip: compress revisions independently
* concat: concatenate revisions and compress in chunks (default)
* -c <chunk-size> maximum number of revisions in a concat chunk
* -b <begin-date> earliest date to check for uncompressed revisions
* -e <end-date> latest revision date to compress
* -s <startid> the id to start from (referring to the text table for
* type gzip, and to the page table for type concat)
* -n <endid> the page_id to stop at (only when using concat compression type)
* --extdb <cluster> store specified revisions in an external cluster (untested)
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
* http://www.gnu.org/copyleft/gpl.html
*
* @file
* @ingroup Maintenance ExternalStorage
*/
require_once( __DIR__ . '/../Maintenance.php' );
/**
* Maintenance script that compress the text of a wiki.
*
* @ingroup Maintenance ExternalStorage
*/
class CompressOld extends Maintenance {
/**
* @todo document
*/
const LS_INDIVIDUAL = 0;
const LS_CHUNKED = 1;
public function __construct() {
parent::__construct();
$this->mDescription = 'Compress the text of a wiki';
$this->addOption( 'type', 'Set compression type to either: gzip|concat', false, true, 't' );
$this->addOption( 'chunksize', 'Maximum number of revisions in a concat chunk', false, true, 'c' );
$this->addOption( 'begin-date', 'Earliest date to check for uncompressed revisions', false, true, 'b' );
$this->addOption( 'end-date', 'Latest revision date to compress', false, true, 'e' );
$this->addOption( 'startid', 'The id to start from (gzip -> text table, concat -> page table)', false, true, 's' );
$this->addOption( 'extdb', 'Store specified revisions in an external cluster (untested)', false, true );
$this->addOption( 'endid', 'The page_id to stop at (only when using concat compression type)', false, true, 'n' );
}
public function execute() {
global $wgDBname;
if ( !function_exists( "gzdeflate" ) ) {
$this->error( "You must enable zlib support in PHP to compress old revisions!\n" .
"Please see http://www.php.net/manual/en/ref.zlib.php\n", true );
}
$type = $this->getOption( 'type', 'concat' );
$chunkSize = $this->getOption( 'chunksize', 20 );
$startId = $this->getOption( 'startid', 0 );
$beginDate = $this->getOption( 'begin-date', '' );
$endDate = $this->getOption( 'end-date', '' );
$extDB = $this->getOption( 'extdb', '' );
$endId = $this->getOption( 'endid', false );
if ( $type != 'concat' && $type != 'gzip' ) {
$this->error( "Type \"{$type}\" not supported" );
}
if ( $extDB != '' ) {
$this->output( "Compressing database {$wgDBname} to external cluster {$extDB}\n"
. str_repeat( '-', 76 ) . "\n\n" );
} else {
$this->output( "Compressing database {$wgDBname}\n"
. str_repeat( '-', 76 ) . "\n\n" );
}
$success = true;
if ( $type == 'concat' ) {
$success = $this->compressWithConcat( $startId, $chunkSize, $beginDate,
$endDate, $extDB, $endId );
} else {
$this->compressOldPages( $startId, $extDB );
}
if ( $success ) {
$this->output( "Done.\n" );
}
}
/** @todo document */
private function compressOldPages( $start = 0, $extdb = '' ) {
$chunksize = 50;
$this->output( "Starting from old_id $start...\n" );
$dbw = wfGetDB( DB_MASTER );
do {
$res = $dbw->select( 'text', array( 'old_id','old_flags','old_text' ),
"old_id>=$start", __METHOD__, array( 'ORDER BY' => 'old_id', 'LIMIT' => $chunksize, 'FOR UPDATE' ) );
if( $res->numRows() == 0 ) {
break;
}
$last = $start;
foreach ( $res as $row ) {
# print " {$row->old_id} - {$row->old_namespace}:{$row->old_title}\n";
$this->compressPage( $row, $extdb );
$last = $row->old_id;
}
$start = $last + 1; # Deletion may leave long empty stretches
$this->output( "$start...\n" );
} while( true );
}
/**
* @todo document
* @param $row
* @param $extdb
* @return bool
*/
private function compressPage( $row, $extdb ) {
if ( false !== strpos( $row->old_flags, 'gzip' ) || false !== strpos( $row->old_flags, 'object' ) ) {
#print "Already compressed row {$row->old_id}\n";
return false;
}
$dbw = wfGetDB( DB_MASTER );
$flags = $row->old_flags ? "{$row->old_flags},gzip" : "gzip";
$compress = gzdeflate( $row->old_text );
# Store in external storage if required
if ( $extdb !== '' ) {
$storeObj = new ExternalStoreDB;
$compress = $storeObj->store( $extdb, $compress );
if ( $compress === false ) {
$this->error( "Unable to store object" );
return false;
}
}
# Update text row
$dbw->update( 'text',
array( /* SET */
'old_flags' => $flags,
'old_text' => $compress
), array( /* WHERE */
'old_id' => $row->old_id
), __METHOD__,
array( 'LIMIT' => 1 )
);
return true;
}
/**
* @param $startId
* @param $maxChunkSize
* @param $beginDate
* @param $endDate
* @param $extdb string
* @param $maxPageId bool|int
* @return bool
*/
private function compressWithConcat( $startId, $maxChunkSize, $beginDate,
$endDate, $extdb = "", $maxPageId = false )
{
$loadStyle = self::LS_CHUNKED;
$dbr = wfGetDB( DB_SLAVE );
$dbw = wfGetDB( DB_MASTER );
# Set up external storage
if ( $extdb != '' ) {
$storeObj = new ExternalStoreDB;
}
# Get all articles by page_id
if ( !$maxPageId ) {
$maxPageId = $dbr->selectField( 'page', 'max(page_id)', '', __METHOD__ );
}
$this->output( "Starting from $startId of $maxPageId\n" );
$pageConds = array();
/*
if ( $exclude_ns0 ) {
print "Excluding main namespace\n";
$pageConds[] = 'page_namespace<>0';
}
if ( $queryExtra ) {
$pageConds[] = $queryExtra;
}
*/
# For each article, get a list of revisions which fit the criteria
# No recompression, use a condition on old_flags
# Don't compress object type entities, because that might produce data loss when
# overwriting bulk storage concat rows. Don't compress external references, because
# the script doesn't yet delete rows from external storage.
$conds = array(
'old_flags NOT ' . $dbr->buildLike( $dbr->anyString(), 'object', $dbr->anyString() ) . ' AND old_flags NOT '
. $dbr->buildLike( $dbr->anyString(), 'external', $dbr->anyString() ) );
if ( $beginDate ) {
if ( !preg_match( '/^\d{14}$/', $beginDate ) ) {
$this->error( "Invalid begin date \"$beginDate\"\n" );
return false;
}
$conds[] = "rev_timestamp>'" . $beginDate . "'";
}
if ( $endDate ) {
if ( !preg_match( '/^\d{14}$/', $endDate ) ) {
$this->error( "Invalid end date \"$endDate\"\n" );
return false;
}
$conds[] = "rev_timestamp<'" . $endDate . "'";
}
if ( $loadStyle == self::LS_CHUNKED ) {
$tables = array( 'revision', 'text' );
$fields = array( 'rev_id', 'rev_text_id', 'old_flags', 'old_text' );
$conds[] = 'rev_text_id=old_id';
$revLoadOptions = 'FOR UPDATE';
} else {
$tables = array( 'revision' );
$fields = array( 'rev_id', 'rev_text_id' );
$revLoadOptions = array();
}
# Don't work with current revisions
# Don't lock the page table for update either -- TS 2006-04-04
#$tables[] = 'page';
#$conds[] = 'page_id=rev_page AND rev_id != page_latest';
for ( $pageId = $startId; $pageId <= $maxPageId; $pageId++ ) {
wfWaitForSlaves();
# Wake up
$dbr->ping();
# Get the page row
$pageRes = $dbr->select( 'page',
array('page_id', 'page_namespace', 'page_title','page_latest'),
$pageConds + array('page_id' => $pageId), __METHOD__ );
if ( $pageRes->numRows() == 0 ) {
continue;
}
$pageRow = $dbr->fetchObject( $pageRes );
# Display progress
$titleObj = Title::makeTitle( $pageRow->page_namespace, $pageRow->page_title );
$this->output( "$pageId\t" . $titleObj->getPrefixedDBkey() . " " );
# Load revisions
$revRes = $dbw->select( $tables, $fields,
array_merge( array(
'rev_page' => $pageRow->page_id,
# Don't operate on the current revision
# Use < instead of <> in case the current revision has changed
# since the page select, which wasn't locking
'rev_id < ' . $pageRow->page_latest
), $conds ),
__METHOD__,
$revLoadOptions
);
$revs = array();
foreach ( $revRes as $revRow ) {
$revs[] = $revRow;
}
if ( count( $revs ) < 2) {
# No revisions matching, no further processing
$this->output( "\n" );
continue;
}
# For each chunk
$i = 0;
while ( $i < count( $revs ) ) {
if ( $i < count( $revs ) - $maxChunkSize ) {
$thisChunkSize = $maxChunkSize;
} else {
$thisChunkSize = count( $revs ) - $i;
}
$chunk = new ConcatenatedGzipHistoryBlob();
$stubs = array();
$dbw->begin( __METHOD__ );
$usedChunk = false;
$primaryOldid = $revs[$i]->rev_text_id;
# Get the text of each revision and add it to the object
for ( $j = 0; $j < $thisChunkSize && $chunk->isHappy(); $j++ ) {
$oldid = $revs[$i + $j]->rev_text_id;
# Get text
if ( $loadStyle == self::LS_INDIVIDUAL ) {
$textRow = $dbw->selectRow( 'text',
array( 'old_flags', 'old_text' ),
array( 'old_id' => $oldid ),
__METHOD__,
'FOR UPDATE'
);
$text = Revision::getRevisionText( $textRow );
} else {
$text = Revision::getRevisionText( $revs[$i + $j] );
}
if ( $text === false ) {
$this->error( "\nError, unable to get text in old_id $oldid" );
#$dbw->delete( 'old', array( 'old_id' => $oldid ) );
}
if ( $extdb == "" && $j == 0 ) {
$chunk->setText( $text );
$this->output( '.' );
} else {
# Don't make a stub if it's going to be longer than the article
# Stubs are typically about 100 bytes
if ( strlen( $text ) < 120 ) {
$stub = false;
$this->output( 'x' );
} else {
$stub = new HistoryBlobStub( $chunk->addItem( $text ) );
$stub->setLocation( $primaryOldid );
$stub->setReferrer( $oldid );
$this->output( '.' );
$usedChunk = true;
}
$stubs[$j] = $stub;
}
}
$thisChunkSize = $j;
# If we couldn't actually use any stubs because the pages were too small, do nothing
if ( $usedChunk ) {
if ( $extdb != "" ) {
# Move blob objects to External Storage
$stored = $storeObj->store( $extdb, serialize( $chunk ));
if ($stored === false) {
$this->error( "Unable to store object" );
return false;
}
# Store External Storage URLs instead of Stub placeholders
foreach ($stubs as $stub) {
if ($stub===false)
continue;
# $stored should provide base path to a BLOB
$url = $stored."/".$stub->getHash();
$dbw->update( 'text',
array( /* SET */
'old_text' => $url,
'old_flags' => 'external,utf-8',
), array ( /* WHERE */
'old_id' => $stub->getReferrer(),
)
);
}
} else {
# Store the main object locally
$dbw->update( 'text',
array( /* SET */
'old_text' => serialize( $chunk ),
'old_flags' => 'object,utf-8',
), array( /* WHERE */
'old_id' => $primaryOldid
)
);
# Store the stub objects
for ( $j = 1; $j < $thisChunkSize; $j++ ) {
# Skip if not compressing and don't overwrite the first revision
if ( $stubs[$j] !== false && $revs[$i + $j]->rev_text_id != $primaryOldid ) {
$dbw->update( 'text',
array( /* SET */
'old_text' => serialize($stubs[$j]),
'old_flags' => 'object,utf-8',
), array( /* WHERE */
'old_id' => $revs[$i + $j]->rev_text_id
)
);
}
}
}
}
# Done, next
$this->output( "/" );
$dbw->commit( __METHOD__ );
$i += $thisChunkSize;
wfWaitForSlaves();
}
$this->output( "\n" );
}
return true;
}
}
$maintClass = 'CompressOld';
require_once( RUN_MAINTENANCE_IF_MAIN );