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| 1 | <?php |
| 2 | /** |
| 3 | * Convert history stubs that point to an external row to direct external |
| 4 | * pointers. |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or modify |
| 7 | * it under the terms of the GNU General Public License as published by |
| 8 | * the Free Software Foundation; either version 2 of the License, or |
| 9 | * (at your option) any later version. |
| 10 | * |
| 11 | * This program is distributed in the hope that it will be useful, |
| 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 14 | * GNU General Public License for more details. |
| 15 | * |
| 16 | * You should have received a copy of the GNU General Public License along |
| 17 | * with this program; if not, write to the Free Software Foundation, Inc., |
| 18 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. |
| 19 | * http://www.gnu.org/copyleft/gpl.html |
| 20 | * |
| 21 | * @file |
| 22 | * @ingroup Maintenance ExternalStorage |
| 23 | */ |
| 24 | |
| 25 | use MediaWiki\Maintenance\UndoLog; |
| 26 | use MediaWiki\Storage\SqlBlobStore; |
| 27 | |
| 28 | require_once __DIR__ . '/../Maintenance.php'; |
| 29 | |
| 30 | class ResolveStubs extends Maintenance { |
| 31 | /** @var UndoLog|null */ |
| 32 | private $undoLog; |
| 33 | |
| 34 | public function __construct() { |
| 35 | parent::__construct(); |
| 36 | $this->setBatchSize( 1000 ); |
| 37 | $this->addOption( 'dry-run', 'Don\'t update any rows' ); |
| 38 | $this->addOption( 'undo', 'Undo log location', false, true ); |
| 39 | } |
| 40 | |
| 41 | /** |
| 42 | * Convert history stubs that point to an external row to direct |
| 43 | * external pointers |
| 44 | */ |
| 45 | public function execute() { |
| 46 | $dbw = $this->getPrimaryDB(); |
| 47 | $dbr = $this->getReplicaDB(); |
| 48 | $maxID = $dbr->newSelectQueryBuilder() |
| 49 | ->select( 'MAX(old_id)' ) |
| 50 | ->from( 'text' ) |
| 51 | ->caller( __METHOD__ )->fetchField(); |
| 52 | $blockSize = $this->getBatchSize(); |
| 53 | $dryRun = $this->getOption( 'dry-run' ); |
| 54 | $this->setUndoLog( new UndoLog( $this->getOption( 'undo' ), $dbw ) ); |
| 55 | |
| 56 | $numBlocks = intval( $maxID / $blockSize ) + 1; |
| 57 | $numResolved = 0; |
| 58 | $numTotal = 0; |
| 59 | |
| 60 | for ( $b = 0; $b < $numBlocks; $b++ ) { |
| 61 | $this->waitForReplication(); |
| 62 | |
| 63 | $this->output( sprintf( "%5.2f%%\n", $b / $numBlocks * 100 ) ); |
| 64 | $start = $blockSize * $b + 1; |
| 65 | $end = $blockSize * ( $b + 1 ); |
| 66 | |
| 67 | $res = $dbr->newSelectQueryBuilder() |
| 68 | ->select( [ 'old_id', 'old_text', 'old_flags' ] ) |
| 69 | ->from( 'text' ) |
| 70 | ->where( |
| 71 | "old_id>=$start AND old_id<=$end " . |
| 72 | "AND old_flags LIKE '%object%' AND old_flags NOT LIKE '%external%' " . |
| 73 | // LOWER() doesn't work on binary text, need to convert |
| 74 | 'AND LOWER(CONVERT(LEFT(old_text,22) USING latin1)) = \'o:15:"historyblobstub"\'' |
| 75 | ) |
| 76 | ->caller( __METHOD__ )->fetchResultSet(); |
| 77 | foreach ( $res as $row ) { |
| 78 | $numResolved += $this->resolveStub( $row, $dryRun ) ? 1 : 0; |
| 79 | $numTotal++; |
| 80 | } |
| 81 | } |
| 82 | $this->output( "100%\n" ); |
| 83 | $this->output( "$numResolved of $numTotal stubs resolved\n" ); |
| 84 | } |
| 85 | |
| 86 | /** |
| 87 | * @param UndoLog $undoLog |
| 88 | */ |
| 89 | public function setUndoLog( UndoLog $undoLog ) { |
| 90 | $this->undoLog = $undoLog; |
| 91 | } |
| 92 | |
| 93 | /** |
| 94 | * Resolve a history stub. |
| 95 | * |
| 96 | * This is called by MoveToExternal |
| 97 | * |
| 98 | * @param stdClass $row The existing text row |
| 99 | * @param bool $dryRun |
| 100 | * @return bool |
| 101 | */ |
| 102 | public function resolveStub( $row, $dryRun ) { |
| 103 | $id = $row->old_id; |
| 104 | $stub = unserialize( $row->old_text ); |
| 105 | $flags = SqlBlobStore::explodeFlags( $row->old_flags ); |
| 106 | |
| 107 | $dbr = $this->getReplicaDB(); |
| 108 | |
| 109 | if ( !( $stub instanceof HistoryBlobStub ) ) { |
| 110 | print "Error at old_id $id: found object of class " . get_class( $stub ) . |
| 111 | ", expecting HistoryBlobStub\n"; |
| 112 | return false; |
| 113 | } |
| 114 | |
| 115 | $mainId = $stub->getLocation(); |
| 116 | if ( !$mainId ) { |
| 117 | print "Error at old_id $id: falsey location\n"; |
| 118 | return false; |
| 119 | } |
| 120 | |
| 121 | # Get the main text row |
| 122 | $mainTextRow = $dbr->newSelectQueryBuilder() |
| 123 | ->select( [ 'old_text', 'old_flags' ] ) |
| 124 | ->from( 'text' ) |
| 125 | ->where( [ 'old_id' => $mainId ] ) |
| 126 | ->caller( __METHOD__ )->fetchRow(); |
| 127 | |
| 128 | if ( !$mainTextRow ) { |
| 129 | print "Error at old_id $id: can't find main text row old_id $mainId\n"; |
| 130 | return false; |
| 131 | } |
| 132 | |
| 133 | $mainFlags = SqlBlobStore::explodeFlags( $mainTextRow->old_flags ); |
| 134 | $mainText = $mainTextRow->old_text; |
| 135 | |
| 136 | if ( !in_array( 'external', $mainFlags ) ) { |
| 137 | print "Error at old_id $id: target $mainId is not external\n"; |
| 138 | return false; |
| 139 | } |
| 140 | if ( preg_match( '!^DB://([^/]*)/([^/]*)/[0-9a-f]{32}$!', $mainText ) ) { |
| 141 | print "Error at old_id $id: target $mainId is a CGZ pointer\n"; |
| 142 | return false; |
| 143 | } |
| 144 | if ( preg_match( '!^DB://([^/]*)/([^/]*)/[0-9]{1,6}$!', $mainText ) ) { |
| 145 | print "Error at old_id $id: target $mainId is a DHB pointer\n"; |
| 146 | return false; |
| 147 | } |
| 148 | if ( !preg_match( '!^DB://([^/]*)/([^/]*)$!', $mainText ) ) { |
| 149 | print "Error at old_id $id: target $mainId has unrecognised text\n"; |
| 150 | return false; |
| 151 | } |
| 152 | |
| 153 | # Preserve the legacy encoding flag, but switch from object to external |
| 154 | if ( in_array( 'utf-8', $flags ) ) { |
| 155 | $newFlags = 'utf-8,external'; |
| 156 | } else { |
| 157 | $newFlags = 'external'; |
| 158 | } |
| 159 | $newText = $mainText . '/' . $stub->getHash(); |
| 160 | |
| 161 | # Update the row |
| 162 | if ( $dryRun ) { |
| 163 | $this->output( "Resolve $id => $newFlags $newText\n" ); |
| 164 | } else { |
| 165 | $updated = $this->undoLog->update( |
| 166 | 'text', |
| 167 | [ |
| 168 | 'old_flags' => $newFlags, |
| 169 | 'old_text' => $newText |
| 170 | ], |
| 171 | (array)$row, |
| 172 | __METHOD__ |
| 173 | ); |
| 174 | if ( !$updated ) { |
| 175 | $this->output( "Updated of old_id $id failed to match\n" ); |
| 176 | return false; |
| 177 | } |
| 178 | } |
| 179 | return true; |
| 180 | } |
| 181 | } |
| 182 | |
| 183 | $maintClass = ResolveStubs::class; |
| 184 | require_once RUN_MAINTENANCE_IF_MAIN; |