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<?php
/**
* @file
* @ingroup Maintenance ExternalStorage
*/
/** @todo document */
function compressOldPages( $start = 0, $extdb = '' ) {
$fname = 'compressOldPages';
$chunksize = 50;
print "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", $fname, array( 'ORDER BY' => 'old_id', 'LIMIT' => $chunksize, 'FOR UPDATE' ) );
if( $dbw->numRows( $res ) == 0 ) {
break;
}
$last = $start;
while( $row = $dbw->fetchObject( $res ) ) {
# print " {$row->old_id} - {$row->old_namespace}:{$row->old_title}\n";
compressPage( $row, $extdb );
$last = $row->old_id;
}
$dbw->freeResult( $res );
$start = $last + 1; # Deletion may leave long empty stretches
print "$start...\n";
} while( true );
}
/** @todo document */
function compressPage( $row, $extdb ) {
$fname = 'compressPage';
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 ) {
print "Unable to store object\n";
return false;
}
}
# Update text row
$dbw->update( 'text',
array( /* SET */
'old_flags' => $flags,
'old_text' => $compress
), array( /* WHERE */
'old_id' => $row->old_id
), $fname,
array( 'LIMIT' => 1 )
);
return true;
}
define( 'LS_INDIVIDUAL', 0 );
define( 'LS_CHUNKED', 1 );
/** @todo document */
function compressWithConcat( $startId, $maxChunkSize, $beginDate,
$endDate, $extdb="", $maxPageId = false )
{
$fname = 'compressWithConcat';
$loadStyle = 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)', '', $fname );
}
print "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 ( $beginDate ) {
if ( !preg_match( '/^\d{14}$/', $beginDate ) ) {
print "Invalid begin date \"$beginDate\"\n";
return false;
}
$conds[] = "rev_timestamp>'" . $beginDate . "'";
}
if ( $endDate ) {
if ( !preg_match( '/^\d{14}$/', $endDate ) ) {
print "Invalid end date \"$endDate\"\n";
return false;
}
$conds[] = "rev_timestamp<'" . $endDate . "'";
}
if ( $loadStyle == 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( 5 );
# 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), $fname );
if ( $dbr->numRows( $pageRes ) == 0 ) {
continue;
}
$pageRow = $dbr->fetchObject( $pageRes );
# Display progress
$titleObj = Title::makeTitle( $pageRow->page_namespace, $pageRow->page_title );
print "$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 ),
$fname,
$revLoadOptions
);
$revs = array();
while ( $revRow = $dbw->fetchObject( $revRes ) ) {
$revs[] = $revRow;
}
if ( count( $revs ) < 2) {
# No revisions matching, no further processing
print "\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();
$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 == LS_INDIVIDUAL ) {
$textRow = $dbw->selectRow( 'text',
array( 'old_flags', 'old_text' ),
array( 'old_id' => $oldid ),
$fname,
'FOR UPDATE'
);
$text = Revision::getRevisionText( $textRow );
} else {
$text = Revision::getRevisionText( $revs[$i + $j] );
}
if ( $text === false ) {
print "\nError, unable to get text in old_id $oldid\n";
#$dbw->delete( 'old', array( 'old_id' => $oldid ) );
}
if ( $extdb == "" && $j == 0 ) {
$chunk->setText( $text );
print '.';
} 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;
print 'x';
} else {
$stub = new HistoryBlobStub( $chunk->addItem( $text ) );
$stub->setLocation( $primaryOldid );
$stub->setReferrer( $oldid );
print '.';
$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) {
print "Unable to store object\n";
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
print "/";
$dbw->commit();
$i += $thisChunkSize;
wfWaitForSlaves( 5 );
}
print "\n";
}
return true;
}