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| 1 | <?php |
| 2 | |
| 3 | namespace Flow\Formatter; |
| 4 | |
| 5 | use Flow\Data\ManagerGroup; |
| 6 | use Flow\FlowActions; |
| 7 | use Flow\Model\AbstractRevision; |
| 8 | use Flow\Model\UUID; |
| 9 | use Flow\Repository\TreeRepository; |
| 10 | |
| 11 | abstract class HistoryQuery extends AbstractQuery { |
| 12 | // This requests extra to take into account that we will filter some out, |
| 13 | // to try to reduce the number of rounds (preferably to 1). |
| 14 | // If you raise this, also increase FLOW_HISTORY_INDEX_LIMIT and bump the |
| 15 | // key of the indexes using FLOW_HISTORY_INDEX_LIMIT |
| 16 | // This magic number is based on new-post/new-topic being about 26% of post revisions. |
| 17 | // (queried from production), since that is the only thing currently excluded. |
| 18 | protected const POST_OVERFETCH_FACTOR = 1.36; |
| 19 | |
| 20 | /** |
| 21 | * @var FlowActions |
| 22 | */ |
| 23 | protected $actions; |
| 24 | |
| 25 | /** |
| 26 | * @param ManagerGroup $storage |
| 27 | * @param TreeRepository $treeRepo |
| 28 | * @param FlowActions $actions |
| 29 | */ |
| 30 | public function __construct( |
| 31 | ManagerGroup $storage, |
| 32 | TreeRepository $treeRepo, |
| 33 | FlowActions $actions |
| 34 | ) { |
| 35 | parent::__construct( $storage, $treeRepo ); |
| 36 | $this->actions = $actions; |
| 37 | } |
| 38 | |
| 39 | /** |
| 40 | * @param AbstractRevision $revision |
| 41 | * @return bool |
| 42 | */ |
| 43 | protected function includeInHistory( AbstractRevision $revision ) { |
| 44 | // If you add exclude_from_history to a new type, use doInternalQueries on additional |
| 45 | // queries as needed. |
| 46 | return !$this->actions->getValue( $revision->getChangeType(), 'exclude_from_history' ); |
| 47 | } |
| 48 | |
| 49 | /** |
| 50 | * Gets query options that are common to all history queries |
| 51 | * |
| 52 | * @param string $direction 'fwd' or 'rev'. 'fwd' means to get items older than |
| 53 | * the offset. 'rev' means to get items newer. Either way, an individual page is |
| 54 | * eventually returned and displayed in descending order. |
| 55 | * @param int $limit Maximum number of items |
| 56 | * @param UUID|null $offset UUID to use as offset (optional) |
| 57 | * @return array Associative array of options for query |
| 58 | */ |
| 59 | protected function getOptions( $direction, $limit, UUID $offset = null ) { |
| 60 | return [ |
| 61 | 'sort' => 'rev_id', |
| 62 | 'order' => $direction === 'fwd' ? 'DESC' : 'ASC', |
| 63 | 'limit' => $limit, |
| 64 | 'offset-id' => $offset, |
| 65 | 'offset-dir' => $direction, |
| 66 | 'offset-include' => false, |
| 67 | ]; |
| 68 | } |
| 69 | |
| 70 | /** |
| 71 | * Internally re-query as needed to handle items excluded from history |
| 72 | * |
| 73 | * Re-queries until there are no more entries or after filtering, there are the |
| 74 | * desired number of results. |
| 75 | * |
| 76 | * This respects the given order (ASC or DESC), but the reversing for 'rev' is in |
| 77 | * getResults. |
| 78 | * |
| 79 | * @param string $storageClass Storage class ID |
| 80 | * @param array $attributes Query attriutes |
| 81 | * @param array $options Query options, including offset-id and limit |
| 82 | * @param float $overfetchFactor Factor to overfetch by to anticipate excludes |
| 83 | * @return array Array of history rows |
| 84 | */ |
| 85 | protected function doInternalQueries( $storageClass, $attributes, $options, $overfetchFactor ) { |
| 86 | $result = []; |
| 87 | |
| 88 | $limit = $options['limit']; |
| 89 | $internalOffset = $options['offset-id']; |
| 90 | |
| 91 | do { |
| 92 | $remainingNeeded = $limit - count( $result ); |
| 93 | |
| 94 | // The special cases here are to try reduce dribbling out of final requests (50, 25, 10, 5...). |
| 95 | if ( $remainingNeeded < 50 ) { |
| 96 | $overfetchFactor *= 2; |
| 97 | } |
| 98 | |
| 99 | $beforeFilteringCountWanted = max( 10, intval( $overfetchFactor * $remainingNeeded ) ); |
| 100 | |
| 101 | // Over-fetch by 1 item so we can figure out when to stop re-querying. |
| 102 | $options['limit'] = $beforeFilteringCountWanted + 1; |
| 103 | |
| 104 | $options['offset-id'] = $internalOffset; |
| 105 | |
| 106 | $resultBeforeFiltering = $this->storage->find( $storageClass, $attributes, $options ); |
| 107 | |
| 108 | // We over-fetched, now get rid of redundant value for our "real" data |
| 109 | $internalOverfetched = null; |
| 110 | if ( count( $resultBeforeFiltering ) > $beforeFilteringCountWanted ) { |
| 111 | $internalOverfetched = array_pop( $resultBeforeFiltering ); |
| 112 | } |
| 113 | |
| 114 | $resultAfterFiltering = array_filter( $resultBeforeFiltering, [ $this, 'includeInHistory' ] ); |
| 115 | |
| 116 | if ( count( $resultBeforeFiltering ) >= 1 ) { |
| 117 | $internalOffset = end( $resultBeforeFiltering )->getRevisionId(); |
| 118 | } |
| 119 | |
| 120 | $trimmedResultAfterFiltering = array_slice( $resultAfterFiltering, 0, $remainingNeeded ); |
| 121 | $result = array_merge( $result, $trimmedResultAfterFiltering ); |
| 122 | } while ( count( $result ) < $limit && $internalOverfetched !== null ); |
| 123 | |
| 124 | return $result; |
| 125 | } |
| 126 | |
| 127 | } |