a9b9b9ed39c9cff879ca3751c222375d9a80a927
3 * Compress the text of a wiki.
8 * php compressOld.php [options...]
11 * php compressOld.php <database> [options...]
14 * -t <type> set compression type to either:
15 * gzip: compress revisions independently
16 * concat: concatenate revisions and compress in chunks (default)
17 * -c <chunk-size> maximum number of revisions in a concat chunk
18 * -b <begin-date> earliest date to check for uncompressed revisions
19 * -e <end-date> latest revision date to compress
20 * -s <startid> the id to start from (referring to the text table for
21 * type gzip, and to the page table for type concat)
22 * -n <endid> the page_id to stop at (only when using concat compression type)
23 * --extdb <cluster> store specified revisions in an external cluster (untested)
25 * This program is free software; you can redistribute it and/or modify
26 * it under the terms of the GNU General Public License as published by
27 * the Free Software Foundation; either version 2 of the License, or
28 * (at your option) any later version.
30 * This program is distributed in the hope that it will be useful,
31 * but WITHOUT ANY WARRANTY; without even the implied warranty of
32 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
33 * GNU General Public License for more details.
35 * You should have received a copy of the GNU General Public License along
36 * with this program; if not, write to the Free Software Foundation, Inc.,
37 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
38 * http://www.gnu.org/copyleft/gpl.html
41 * @ingroup Maintenance ExternalStorage
44 require_once __DIR__
. '/../Maintenance.php';
47 * Maintenance script that compress the text of a wiki.
49 * @ingroup Maintenance ExternalStorage
51 class CompressOld
extends Maintenance
{
53 * Option to load each revision individually.
55 const LS_INDIVIDUAL
= 0;
58 * Option to load revisions in chunks.
62 public function __construct() {
63 parent
::__construct();
64 $this->addDescription( 'Compress the text of a wiki' );
65 $this->addOption( 'type', 'Set compression type to either: gzip|concat', false, true, 't' );
68 'Maximum number of revisions in a concat chunk',
75 'Earliest date to check for uncompressed revisions',
80 $this->addOption( 'end-date', 'Latest revision date to compress', false, true, 'e' );
83 'The id to start from (gzip -> text table, concat -> page table)',
90 'Store specified revisions in an external cluster (untested)',
96 'The page_id to stop at (only when using concat compression type)',
103 public function execute() {
105 if ( !function_exists( "gzdeflate" ) ) {
106 $this->fatalError( "You must enable zlib support in PHP to compress old revisions!\n" .
107 "Please see https://secure.php.net/manual/en/ref.zlib.php\n" );
110 $type = $this->getOption( 'type', 'concat' );
111 $chunkSize = $this->getOption( 'chunksize', 20 );
112 $startId = $this->getOption( 'startid', 0 );
113 $beginDate = $this->getOption( 'begin-date', '' );
114 $endDate = $this->getOption( 'end-date', '' );
115 $extDB = $this->getOption( 'extdb', '' );
116 $endId = $this->getOption( 'endid', false );
118 if ( $type != 'concat' && $type != 'gzip' ) {
119 $this->error( "Type \"{$type}\" not supported" );
122 if ( $extDB != '' ) {
123 $this->output( "Compressing database {$wgDBname} to external cluster {$extDB}\n"
124 . str_repeat( '-', 76 ) . "\n\n" );
126 $this->output( "Compressing database {$wgDBname}\n"
127 . str_repeat( '-', 76 ) . "\n\n" );
131 if ( $type == 'concat' ) {
132 $success = $this->compressWithConcat( $startId, $chunkSize, $beginDate,
133 $endDate, $extDB, $endId );
135 $this->compressOldPages( $startId, $extDB );
139 $this->output( "Done.\n" );
144 * Fetch the text row-by-row to 'compressPage' function for compression.
147 * @param string $extdb
149 private function compressOldPages( $start = 0, $extdb = '' ) {
151 $this->output( "Starting from old_id $start...\n" );
152 $dbw = $this->getDB( DB_MASTER
);
156 [ 'old_id', 'old_flags', 'old_text' ],
159 [ 'ORDER BY' => 'old_id', 'LIMIT' => $chunksize, 'FOR UPDATE' ]
162 if ( $res->numRows() == 0 ) {
168 foreach ( $res as $row ) {
169 # print " {$row->old_id} - {$row->old_namespace}:{$row->old_title}\n";
170 $this->compressPage( $row, $extdb );
171 $last = $row->old_id
;
174 $start = $last +
1; # Deletion may leave long empty stretches
175 $this->output( "$start...\n" );
180 * Compress the text in gzip format.
182 * @param stdClass $row
183 * @param string $extdb
186 private function compressPage( $row, $extdb ) {
187 if ( false !== strpos( $row->old_flags
, 'gzip' )
188 ||
false !== strpos( $row->old_flags
, 'object' )
190 # print "Already compressed row {$row->old_id}\n";
193 $dbw = $this->getDB( DB_MASTER
);
194 $flags = $row->old_flags ?
"{$row->old_flags},gzip" : "gzip";
195 $compress = gzdeflate( $row->old_text
);
197 # Store in external storage if required
198 if ( $extdb !== '' ) {
199 $storeObj = new ExternalStoreDB
;
200 $compress = $storeObj->store( $extdb, $compress );
201 if ( $compress === false ) {
202 $this->error( "Unable to store object" );
209 $dbw->update( 'text',
211 'old_flags' => $flags,
212 'old_text' => $compress
214 'old_id' => $row->old_id
223 * Compress the text in chunks after concatenating the revisions.
225 * @param int $startId
226 * @param int $maxChunkSize
227 * @param string $beginDate
228 * @param string $endDate
229 * @param string $extdb
230 * @param bool|int $maxPageId
233 private function compressWithConcat( $startId, $maxChunkSize, $beginDate,
234 $endDate, $extdb = "", $maxPageId = false
236 $loadStyle = self
::LS_CHUNKED
;
238 $dbr = $this->getDB( DB_REPLICA
);
239 $dbw = $this->getDB( DB_MASTER
);
241 # Set up external storage
242 if ( $extdb != '' ) {
243 $storeObj = new ExternalStoreDB
;
246 # Get all articles by page_id
248 $maxPageId = $dbr->selectField( 'page', 'max(page_id)', '', __METHOD__
);
250 $this->output( "Starting from $startId of $maxPageId\n" );
254 if ( $exclude_ns0 ) {
255 print "Excluding main namespace\n";
256 $pageConds[] = 'page_namespace<>0';
259 $pageConds[] = $queryExtra;
263 # For each article, get a list of revisions which fit the criteria
265 # No recompression, use a condition on old_flags
266 # Don't compress object type entities, because that might produce data loss when
267 # overwriting bulk storage concat rows. Don't compress external references, because
268 # the script doesn't yet delete rows from external storage.
270 'old_flags NOT ' . $dbr->buildLike( $dbr->anyString(), 'object', $dbr->anyString() )
271 . ' AND old_flags NOT '
272 . $dbr->buildLike( $dbr->anyString(), 'external', $dbr->anyString() )
276 if ( !preg_match( '/^\d{14}$/', $beginDate ) ) {
277 $this->error( "Invalid begin date \"$beginDate\"\n" );
281 $conds[] = "rev_timestamp>'" . $beginDate . "'";
284 if ( !preg_match( '/^\d{14}$/', $endDate ) ) {
285 $this->error( "Invalid end date \"$endDate\"\n" );
289 $conds[] = "rev_timestamp<'" . $endDate . "'";
291 if ( $loadStyle == self
::LS_CHUNKED
) {
292 $tables = [ 'revision', 'text' ];
293 $fields = [ 'rev_id', 'rev_text_id', 'old_flags', 'old_text' ];
294 $conds[] = 'rev_text_id=old_id';
295 $revLoadOptions = 'FOR UPDATE';
297 $tables = [ 'revision' ];
298 $fields = [ 'rev_id', 'rev_text_id' ];
299 $revLoadOptions = [];
302 # Don't work with current revisions
303 # Don't lock the page table for update either -- TS 2006-04-04
304 # $tables[] = 'page';
305 # $conds[] = 'page_id=rev_page AND rev_id != page_latest';
307 for ( $pageId = $startId; $pageId <= $maxPageId; $pageId++
) {
314 $pageRes = $dbr->select( 'page',
315 [ 'page_id', 'page_namespace', 'page_title', 'page_latest' ],
316 $pageConds +
[ 'page_id' => $pageId ], __METHOD__
);
317 if ( $pageRes->numRows() == 0 ) {
320 $pageRow = $dbr->fetchObject( $pageRes );
323 $titleObj = Title
::makeTitle( $pageRow->page_namespace
, $pageRow->page_title
);
324 $this->output( "$pageId\t" . $titleObj->getPrefixedDBkey() . " " );
327 $revRes = $dbw->select( $tables, $fields,
329 'rev_page' => $pageRow->page_id
,
330 # Don't operate on the current revision
331 # Use < instead of <> in case the current revision has changed
332 # since the page select, which wasn't locking
333 'rev_id < ' . $pageRow->page_latest
339 foreach ( $revRes as $revRow ) {
343 if ( count( $revs ) < 2 ) {
344 # No revisions matching, no further processing
345 $this->output( "\n" );
351 while ( $i < count( $revs ) ) {
352 if ( $i < count( $revs ) - $maxChunkSize ) {
353 $thisChunkSize = $maxChunkSize;
355 $thisChunkSize = count( $revs ) - $i;
358 $chunk = new ConcatenatedGzipHistoryBlob();
360 $this->beginTransaction( $dbw, __METHOD__
);
362 $primaryOldid = $revs[$i]->rev_text_id
;
364 # Get the text of each revision and add it to the object
365 // phpcs:ignore Generic.CodeAnalysis.ForLoopWithTestFunctionCall
366 for ( $j = 0; $j < $thisChunkSize && $chunk->isHappy(); $j++
) {
367 $oldid = $revs[$i +
$j]->rev_text_id
;
370 if ( $loadStyle == self
::LS_INDIVIDUAL
) {
371 $textRow = $dbw->selectRow( 'text',
372 [ 'old_flags', 'old_text' ],
373 [ 'old_id' => $oldid ],
377 $text = Revision
::getRevisionText( $textRow );
379 $text = Revision
::getRevisionText( $revs[$i +
$j] );
382 if ( $text === false ) {
383 $this->error( "\nError, unable to get text in old_id $oldid" );
384 # $dbw->delete( 'old', [ 'old_id' => $oldid ] );
387 if ( $extdb == "" && $j == 0 ) {
388 $chunk->setText( $text );
389 $this->output( '.' );
391 # Don't make a stub if it's going to be longer than the article
392 # Stubs are typically about 100 bytes
393 if ( strlen( $text ) < 120 ) {
395 $this->output( 'x' );
397 $stub = new HistoryBlobStub( $chunk->addItem( $text ) );
398 $stub->setLocation( $primaryOldid );
399 $stub->setReferrer( $oldid );
400 $this->output( '.' );
408 # If we couldn't actually use any stubs because the pages were too small, do nothing
410 if ( $extdb != "" ) {
411 # Move blob objects to External Storage
412 $stored = $storeObj->store( $extdb, serialize( $chunk ) );
413 if ( $stored === false ) {
414 $this->error( "Unable to store object" );
418 # Store External Storage URLs instead of Stub placeholders
419 foreach ( $stubs as $stub ) {
420 if ( $stub === false ) {
423 # $stored should provide base path to a BLOB
424 $url = $stored . "/" . $stub->getHash();
425 $dbw->update( 'text',
428 'old_flags' => 'external,utf-8',
430 'old_id' => $stub->getReferrer(),
435 # Store the main object locally
436 $dbw->update( 'text',
438 'old_text' => serialize( $chunk ),
439 'old_flags' => 'object,utf-8',
441 'old_id' => $primaryOldid
445 # Store the stub objects
446 for ( $j = 1; $j < $thisChunkSize; $j++
) {
447 # Skip if not compressing and don't overwrite the first revision
448 if ( $stubs[$j] !== false && $revs[$i +
$j]->rev_text_id
!= $primaryOldid ) {
449 $dbw->update( 'text',
451 'old_text' => serialize( $stubs[$j] ),
452 'old_flags' => 'object,utf-8',
454 'old_id' => $revs[$i +
$j]->rev_text_id
462 $this->output( "/" );
463 $this->commitTransaction( $dbw, __METHOD__
);
464 $i +
= $thisChunkSize;
466 $this->output( "\n" );
473 $maintClass = CompressOld
::class;
474 require_once RUN_MAINTENANCE_IF_MAIN
;