maintenance/populateContentTables.php

   1 <?php
   2 /**
   3  * This program is free software; you can redistribute it and/or modify
   4  * it under the terms of the GNU General Public License as published by
   5  * the Free Software Foundation; either version 2 of the License, or
   6  * (at your option) any later version.
   7  *
   8  * This program is distributed in the hope that it will be useful,
   9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  11  * GNU General Public License for more details.
  12  *
  13  * You should have received a copy of the GNU General Public License along
  14  * with this program; if not, write to the Free Software Foundation, Inc.,
  15  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  16  * http://www.gnu.org/copyleft/gpl.html
  17  *
  18  * @file
  19  * @ingroup Maintenance
  20  */
  21
  22 use MediaWiki\MediaWikiServices;
  23 use MediaWiki\Storage\NameTableStore;
  24 use MediaWiki\Storage\SqlBlobStore;
  25 use Wikimedia\Assert\Assert;
  26 use Wikimedia\Rdbms\IDatabase;
  27 use Wikimedia\Rdbms\ResultWrapper;
  28
  29 require_once __DIR__ . '/Maintenance.php';
  30
  31 /**
  32  * Populate the content and slot tables.
  33  * @since 1.32
  34  */
  35 class PopulateContentTables extends Maintenance {
  36
  37         /** @var IDatabase */
  38         private $dbw;
  39
  40         /** @var NameTableStore */
  41         private $contentModelStore;
  42
  43         /** @var int */
  44         private $mainRoleId;
  45
  46         /** @var array|null Map "{$modelId}:{$address}" to content_id */
  47         private $contentRowMap = null;
  48
  49         private $count = 0, $totalCount = 0;
  50
  51         public function __construct() {
  52                 parent::__construct();
  53
  54                 $this->addDescription( 'Populate content and slot tables' );
  55                 $this->addOption( 'table', 'revision or archive table, or `all` to populate both', false,
  56                         true );
  57                 $this->addOption( 'reuse-content',
  58                         'Reuse content table rows when the address and model are the same. '
  59                         . 'This will increase the script\'s time and memory usage, perhaps significantly.',
  60                         false, false );
  61                 $this->setBatchSize( 500 );
  62         }
  63
  64         private function initServices() {
  65                 $this->dbw = $this->getDB( DB_MASTER );
  66                 $this->contentModelStore = MediaWikiServices::getInstance()->getContentModelStore();
  67                 $this->mainRoleId = MediaWikiServices::getInstance()->getSlotRoleStore()->acquireId( 'main' );
  68         }
  69
  70         public function execute() {
  71                 global $wgMultiContentRevisionSchemaMigrationStage;
  72
  73                 $t0 = microtime( true );
  74
  75                 if ( $wgMultiContentRevisionSchemaMigrationStage < MIGRATION_WRITE_BOTH ) {
  76                         $this->writeln(
  77                                 "...cannot update while \$wgMultiContentRevisionSchemaMigrationStage < MIGRATION_WRITE_BOTH"
  78                         );
  79                         return false;
  80                 }
  81
  82                 $this->initServices();
  83
  84                 if ( $this->getOption( 'reuse-content', false ) ) {
  85                         $this->loadContentMap();
  86                 }
  87
  88                 foreach ( $this->getTables() as $table ) {
  89                         $this->populateTable( $table );
  90                 }
  91
  92                 $elapsed = microtime( true ) - $t0;
  93                 $this->writeln( "Done. Processed $this->totalCount rows in $elapsed seconds" );
  94         }
  95
  96         /**
  97          * @return string[]
  98          */
  99         private function getTables() {
 100                 $table = $this->getOption( 'table', 'all' );
 101                 $validTableOptions = [ 'all', 'revision', 'archive' ];
 102
 103                 if ( !in_array( $table, $validTableOptions ) ) {
 104                         $this->fatalError( 'Invalid table. Must be either `revision` or `archive` or `all`' );
 105                 }
 106
 107                 if ( $table === 'all' ) {
 108                         $tables = [ 'revision', 'archive' ];
 109                 } else {
 110                         $tables = [ $table ];
 111                 }
 112
 113                 return $tables;
 114         }
 115
 116         private function loadContentMap() {
 117                 $t0 = microtime( true );
 118                 $this->writeln( "Loading existing content table rows..." );
 119                 $this->contentRowMap = [];
 120                 $dbr = $this->getDB( DB_REPLICA );
 121                 $from = false;
 122                 while ( true ) {
 123                         $res = $dbr->select(
 124                                 'content',
 125                                 [ 'content_id', 'content_address', 'content_model' ],
 126                                 $from ? "content_id > $from" : '',
 127                                 __METHOD__,
 128                                 [ 'ORDER BY' => 'content_id', 'LIMIT' => $this->getBatchSize() ]
 129                         );
 130                         if ( !$res || !$res->numRows() ) {
 131                                 break;
 132                         }
 133                         foreach ( $res as $row ) {
 134                                 $from = $row->content_id;
 135                                 $this->contentRowMap["{$row->content_model}:{$row->content_address}"] = $row->content_id;
 136                         }
 137                 }
 138                 $elapsed = microtime( true ) - $t0;
 139                 $this->writeln( "Loaded " . count( $this->contentRowMap ) . " rows in $elapsed seconds" );
 140         }
 141
 142         /**
 143          * @param string $table
 144          */
 145         private function populateTable( $table ) {
 146                 $t0 = microtime( true );
 147                 $this->count = 0;
 148                 $this->writeln( "Populating $table..." );
 149
 150                 if ( $table === 'revision' ) {
 151                         $idField = 'rev_id';
 152                         $tables = [ 'revision', 'slots', 'page' ];
 153                         $fields = [
 154                                 'rev_id',
 155                                 'len' => 'rev_len',
 156                                 'sha1' => 'rev_sha1',
 157                                 'text_id' => 'rev_text_id',
 158                                 'content_model' => 'rev_content_model',
 159                                 'namespace' => 'page_namespace',
 160                                 'title' => 'page_title',
 161                         ];
 162                         $joins = [
 163                                 'slots' => [ 'LEFT JOIN', 'rev_id=slot_revision_id' ],
 164                                 'page' => [ 'LEFT JOIN', 'rev_page=page_id' ],
 165                         ];
 166                 } else {
 167                         $idField = 'ar_rev_id';
 168                         $tables = [ 'archive', 'slots' ];
 169                         $fields = [
 170                                 'rev_id' => 'ar_rev_id',
 171                                 'len' => 'ar_len',
 172                                 'sha1' => 'ar_sha1',
 173                                 'text_id' => 'ar_text_id',
 174                                 'content_model' => 'ar_content_model',
 175                                 'namespace' => 'ar_namespace',
 176                                 'title' => 'ar_title',
 177                         ];
 178                         $joins = [
 179                                 'slots' => [ 'LEFT JOIN', 'ar_rev_id=slot_revision_id' ],
 180                         ];
 181                 }
 182
 183                 $minmax = $this->dbw->selectRow(
 184                         $table,
 185                         [ 'min' => "MIN( $idField )", 'max' => "MAX( $idField )" ],
 186                         '',
 187                         __METHOD__
 188                 );
 189                 $batchSize = $this->getBatchSize();
 190
 191                 for ( $startId = $minmax->min; $startId <= $minmax->max; $startId += $batchSize ) {
 192                         $endId = min( $startId + $batchSize - 1, $minmax->max );
 193                         $rows = $this->dbw->select(
 194                                 $tables,
 195                                 $fields,
 196                                 [
 197                                         "$idField >= $startId",
 198                                         "$idField <= $endId",
 199                                         'slot_revision_id IS NULL',
 200                                 ],
 201                                 __METHOD__,
 202                                 [ 'ORDER BY' => 'rev_id' ],
 203                                 $joins
 204                         );
 205                         if ( $rows->numRows() !== 0 ) {
 206                                 $this->populateContentTablesForRowBatch( $rows, $startId, $table );
 207                         }
 208
 209                         $elapsed = microtime( true ) - $t0;
 210                         $this->writeln(
 211                                 "... $table processed up to revision id $endId of {$minmax->max}"
 212                                 . " ($this->count rows in $elapsed seconds)"
 213                         );
 214                 }
 215
 216                 $elapsed = microtime( true ) - $t0;
 217                 $this->writeln( "Done populating $table table. Processed $this->count rows in $elapsed seconds" );
 218         }
 219
 220         /**
 221          * @param ResultWrapper $rows
 222          * @param int $startId
 223          * @param string $table
 224          * @return int|null
 225          */
 226         private function populateContentTablesForRowBatch( ResultWrapper $rows, $startId, $table ) {
 227                 $this->beginTransaction( $this->dbw, __METHOD__ );
 228
 229                 if ( $this->contentRowMap === null ) {
 230                         $map = [];
 231                 } else {
 232                         $map = &$this->contentRowMap;
 233                 }
 234                 $contentKeys = [];
 235
 236                 try {
 237                         // Step 1: Figure out content rows needing insertion.
 238                         $contentRows = [];
 239                         foreach ( $rows as $row ) {
 240                                 $revisionId = $row->rev_id;
 241
 242                                 Assert::invariant( $revisionId !== null, 'rev_id must not be null' );
 243
 244                                 $modelId = $this->contentModelStore->acquireId( $this->getContentModel( $row ) );
 245                                 $address = SqlBlobStore::makeAddressFromTextId( $row->text_id );
 246
 247                                 $key = "{$modelId}:{$address}";
 248                                 $contentKeys[$revisionId] = $key;
 249
 250                                 if ( !isset( $map[$key] ) ) {
 251                                         $map[$key] = false;
 252                                         $contentRows[] = [
 253                                                 'content_size' => (int)$row->len,
 254                                                 'content_sha1' => $row->sha1,
 255                                                 'content_model' => $modelId,
 256                                                 'content_address' => $address,
 257                                         ];
 258                                 }
 259                         }
 260
 261                         // Step 2: Insert them, then read them back in for use in the next step.
 262                         if ( $contentRows ) {
 263                                 $id = $this->dbw->selectField( 'content', 'MAX(content_id)', '', __METHOD__ );
 264                                 $this->dbw->insert( 'content', $contentRows, __METHOD__ );
 265                                 $res = $this->dbw->select(
 266                                         'content',
 267                                         [ 'content_id', 'content_model', 'content_address' ],
 268                                         'content_id > ' . (int)$id,
 269                                         __METHOD__
 270                                 );
 271                                 foreach ( $res as $row ) {
 272                                         $key = $row->content_model . ':' . $row->content_address;
 273                                         $map[$key] = $row->content_id;
 274                                 }
 275                         }
 276
 277                         // Step 3: Insert the slot rows.
 278                         $slotRows = [];
 279                         foreach ( $rows as $row ) {
 280                                 $revisionId = $row->rev_id;
 281                                 $contentId = $map[$contentKeys[$revisionId]] ?? false;
 282                                 if ( $contentId === false ) {
 283                                         throw new \RuntimeException( "Content row for $revisionId not found after content insert" );
 284                                 }
 285                                 $slotRows[] = [
 286                                         'slot_revision_id' => $revisionId,
 287                                         'slot_role_id' => $this->mainRoleId,
 288                                         'slot_content_id' => $contentId,
 289                                         // There's no way to really know the previous revision, so assume no inheriting.
 290                                         // rev_parent_id can get changed on undeletions, and deletions can screw up
 291                                         // rev_timestamp ordering.
 292                                         'slot_origin' => $revisionId,
 293                                 ];
 294                         }
 295                         $this->dbw->insert( 'slots', $slotRows, __METHOD__ );
 296                         $this->count += count( $slotRows );
 297                         $this->totalCount += count( $slotRows );
 298                 } catch ( \Exception $e ) {
 299                         $this->rollbackTransaction( $this->dbw, __METHOD__ );
 300                         $this->fatalError( "Failed to populate content table $table row batch starting at $startId "
 301                                 . "due to exception: " . $e->__toString() );
 302                 }
 303
 304                 $this->commitTransaction( $this->dbw, __METHOD__ );
 305         }
 306
 307         /**
 308          * @param \stdClass $row
 309          * @return string
 310          */
 311         private function getContentModel( $row ) {
 312                 if ( isset( $row->content_model ) ) {
 313                         return $row->content_model;
 314                 }
 315
 316                 $title = Title::makeTitle( $row->namespace, $row->title );
 317
 318                 return ContentHandler::getDefaultModelFor( $title );
 319         }
 320
 321         /**
 322          * @param string $msg
 323          */
 324         private function writeln( $msg ) {
 325                 $this->output( "$msg\n" );
 326         }
 327 }
 328
 329 $maintClass = 'PopulateContentTables';
 330 require_once RUN_MAINTENANCE_IF_MAIN;