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| 1 | <?php |
| 2 | |
| 3 | require_once __DIR__ . '/Maintenance.php'; |
| 4 | |
| 5 | /** |
| 6 | * Maintenance script that cleans unused rows in linktarget table |
| 7 | * |
| 8 | * @ingroup Maintenance |
| 9 | * @since 1.39 |
| 10 | */ |
| 11 | class PruneUnusedLinkTargetRows extends Maintenance { |
| 12 | public function __construct() { |
| 13 | parent::__construct(); |
| 14 | $this->addDescription( |
| 15 | 'Clean unused rows in linktarget table' |
| 16 | ); |
| 17 | $this->addOption( |
| 18 | 'sleep', |
| 19 | 'Sleep time (in seconds) between every batch. Default: 0', |
| 20 | false, |
| 21 | true |
| 22 | ); |
| 23 | $this->addOption( 'dry', 'Dry run', false ); |
| 24 | $this->addOption( 'start', 'Start after this lt_id', false, true ); |
| 25 | $this->setBatchSize( 50 ); |
| 26 | } |
| 27 | |
| 28 | public function execute() { |
| 29 | $dbw = $this->getPrimaryDB(); |
| 30 | $dbr = $this->getReplicaDB(); |
| 31 | $maxLtId = (int)$dbr->newSelectQueryBuilder() |
| 32 | ->select( 'MAX(lt_id)' ) |
| 33 | ->from( 'linktarget' ) |
| 34 | ->fetchField(); |
| 35 | // To avoid race condition of newly added linktarget rows |
| 36 | // being deleted before getting a chance to be used, let's ignore the newest ones. |
| 37 | $maxLtId = min( [ $maxLtId - 1, (int)( $maxLtId * 0.99 ) ] ); |
| 38 | |
| 39 | $ltCounter = (int)$this->getOption( 'start', 0 ); |
| 40 | |
| 41 | $this->output( "Deleting unused linktarget rows...\n" ); |
| 42 | $deleted = 0; |
| 43 | $linksMigration = $this->getServiceContainer()->getLinksMigration(); |
| 44 | while ( $ltCounter < $maxLtId ) { |
| 45 | $batchMaxLtId = min( $ltCounter + $this->getBatchSize(), $maxLtId ) + 1; |
| 46 | $this->output( "Checking lt_id between $ltCounter and $batchMaxLtId...\n" ); |
| 47 | $queryBuilder = $dbr->newSelectQueryBuilder() |
| 48 | ->select( [ 'lt_id' ] ) |
| 49 | ->from( 'linktarget' ); |
| 50 | $queryBuilder->where( [ |
| 51 | $dbr->expr( 'lt_id', '<', $batchMaxLtId ), |
| 52 | $dbr->expr( 'lt_id', '>', $ltCounter ) |
| 53 | ] ); |
| 54 | foreach ( $linksMigration::$mapping as $table => $tableData ) { |
| 55 | $queryBuilder->leftJoin( $table, null, $tableData['target_id'] . '=lt_id' ); |
| 56 | $queryBuilder->andWhere( [ |
| 57 | $tableData['target_id'] => null |
| 58 | ] ); |
| 59 | } |
| 60 | $ltIdsToDelete = $queryBuilder->caller( __METHOD__ )->fetchFieldValues(); |
| 61 | if ( !$ltIdsToDelete ) { |
| 62 | $ltCounter += $this->getBatchSize(); |
| 63 | continue; |
| 64 | } |
| 65 | |
| 66 | // Run against primary as well with a faster query plan, just to be safe. |
| 67 | // Also having a bit of time in between helps in cases of immediate removal and insertion of use. |
| 68 | $queryBuilder = $dbr->newSelectQueryBuilder() |
| 69 | ->select( [ 'lt_id' ] ) |
| 70 | ->from( 'linktarget' ) |
| 71 | ->where( [ |
| 72 | 'lt_id' => $ltIdsToDelete, |
| 73 | ] ); |
| 74 | foreach ( $linksMigration::$mapping as $table => $tableData ) { |
| 75 | $queryBuilder->leftJoin( $table, null, $tableData['target_id'] . '=lt_id' ); |
| 76 | $queryBuilder->andWhere( [ |
| 77 | $tableData['target_id'] => null |
| 78 | ] ); |
| 79 | } |
| 80 | $ltIdsToDelete = $queryBuilder->caller( __METHOD__ )->fetchFieldValues(); |
| 81 | if ( !$ltIdsToDelete ) { |
| 82 | $ltCounter += $this->getBatchSize(); |
| 83 | continue; |
| 84 | } |
| 85 | |
| 86 | if ( !$this->getOption( 'dry' ) ) { |
| 87 | $dbw->newDeleteQueryBuilder() |
| 88 | ->deleteFrom( 'linktarget' ) |
| 89 | ->where( [ 'lt_id' => $ltIdsToDelete ] ) |
| 90 | ->caller( __METHOD__ )->execute(); |
| 91 | } |
| 92 | $deleted += count( $ltIdsToDelete ); |
| 93 | $ltCounter += $this->getBatchSize(); |
| 94 | |
| 95 | // Sleep between batches for replication to catch up |
| 96 | $this->waitForReplication(); |
| 97 | $sleep = (int)$this->getOption( 'sleep', 0 ); |
| 98 | if ( $sleep > 0 ) { |
| 99 | sleep( $sleep ); |
| 100 | } |
| 101 | } |
| 102 | |
| 103 | $this->output( |
| 104 | "Completed clean up linktarget table, " |
| 105 | . "$deleted rows deleted.\n" |
| 106 | ); |
| 107 | |
| 108 | return true; |
| 109 | } |
| 110 | |
| 111 | } |
| 112 | |
| 113 | $maintClass = PruneUnusedLinkTargetRows::class; |
| 114 | require_once RUN_MAINTENANCE_IF_MAIN; |