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| 1 | <?php |
| 2 | |
| 3 | namespace Flow\Search\Iterators; |
| 4 | |
| 5 | use Flow\Container; |
| 6 | use Flow\Data\ManagerGroup; |
| 7 | use Flow\DbFactory; |
| 8 | use Flow\Model\AbstractRevision; |
| 9 | use Flow\Model\UUID; |
| 10 | use Iterator; |
| 11 | use MediaWiki\WikiMap\WikiMap; |
| 12 | use stdClass; |
| 13 | use Wikimedia\Rdbms\IDatabase; |
| 14 | use Wikimedia\Rdbms\IResultWrapper; |
| 15 | |
| 16 | abstract class AbstractIterator implements Iterator { |
| 17 | /** |
| 18 | * @var IDatabase |
| 19 | */ |
| 20 | protected $dbr; |
| 21 | |
| 22 | /** |
| 23 | * @var array |
| 24 | */ |
| 25 | protected $conditions = []; |
| 26 | |
| 27 | /** |
| 28 | * @var IResultWrapper|null |
| 29 | */ |
| 30 | protected $results; |
| 31 | |
| 32 | /** |
| 33 | * Depending on where we are in the iteration, this can be null (object |
| 34 | * constructed but not yet being iterated over), AbstractRevision (being |
| 35 | * iterated) or false (end of iteration, no more revisions) |
| 36 | * |
| 37 | * @var AbstractRevision|null|false |
| 38 | */ |
| 39 | protected $current; |
| 40 | |
| 41 | /** |
| 42 | * Depending on where we are in the iteration, this can be integer (object |
| 43 | * being iterated over) or null (iteration not yet started, or completed) |
| 44 | * |
| 45 | * @var int|null |
| 46 | */ |
| 47 | protected $key; |
| 48 | |
| 49 | /** |
| 50 | * @param DbFactory $dbFactory |
| 51 | */ |
| 52 | public function __construct( DbFactory $dbFactory ) { |
| 53 | $this->dbr = $dbFactory->getDB( DB_REPLICA ); |
| 54 | $this->conditions = [ 'workflow_wiki' => WikiMap::getCurrentWikiId() ]; |
| 55 | } |
| 56 | |
| 57 | /** |
| 58 | * @return bool|IResultWrapper |
| 59 | */ |
| 60 | abstract protected function query(); |
| 61 | |
| 62 | /** |
| 63 | * @param array|int|null $pageId |
| 64 | */ |
| 65 | public function setPage( $pageId = null ) { |
| 66 | $this->results = null; |
| 67 | |
| 68 | unset( $this->conditions['workflow_page_id'] ); |
| 69 | if ( $pageId !== null ) { |
| 70 | $this->conditions['workflow_page_id'] = $pageId; |
| 71 | } |
| 72 | } |
| 73 | |
| 74 | /** |
| 75 | * @param int|null $namespace |
| 76 | */ |
| 77 | public function setNamespace( $namespace = null ) { |
| 78 | $this->results = null; |
| 79 | |
| 80 | unset( $this->conditions['workflow_namespace'] ); |
| 81 | if ( $namespace !== null ) { |
| 82 | $this->conditions['workflow_namespace'] = $namespace; |
| 83 | } |
| 84 | } |
| 85 | |
| 86 | /** |
| 87 | * Define where to start iterating (inclusive) |
| 88 | * |
| 89 | * @param UUID|null $revId |
| 90 | */ |
| 91 | public function setFrom( UUID $revId = null ) { |
| 92 | $this->results = null; |
| 93 | |
| 94 | unset( $this->conditions[0] ); |
| 95 | if ( $revId !== null ) { |
| 96 | $this->conditions[0] = 'rev_id >= ' . $this->dbr->addQuotes( $revId->getBinary() ); |
| 97 | } |
| 98 | } |
| 99 | |
| 100 | /** |
| 101 | * Define where to stop iterating (exclusive) |
| 102 | * |
| 103 | * @param UUID|null $revId |
| 104 | */ |
| 105 | public function setTo( UUID $revId = null ) { |
| 106 | $this->results = null; |
| 107 | |
| 108 | unset( $this->conditions[1] ); |
| 109 | if ( $revId !== null ) { |
| 110 | $this->conditions[1] = 'rev_id < ' . $this->dbr->addQuotes( $revId->getBinary() ); |
| 111 | } |
| 112 | } |
| 113 | |
| 114 | /** |
| 115 | * @return AbstractRevision|null The most recently fetched revision object |
| 116 | */ |
| 117 | public function current() { |
| 118 | return $this->current; |
| 119 | } |
| 120 | |
| 121 | /** |
| 122 | * @return int 0-indexed count of the page number fetched |
| 123 | */ |
| 124 | public function key() { |
| 125 | return $this->key; |
| 126 | } |
| 127 | |
| 128 | /** |
| 129 | * Reset the iterator to the beginning of the table. |
| 130 | */ |
| 131 | public function rewind() { |
| 132 | $this->results = null; |
| 133 | $this->key = -1; // self::next() will turn this into 0 |
| 134 | $this->current = null; |
| 135 | $this->next(); |
| 136 | } |
| 137 | |
| 138 | /** |
| 139 | * @return bool True when the iterator is in a valid state |
| 140 | */ |
| 141 | public function valid() { |
| 142 | return (bool)$this->current; |
| 143 | } |
| 144 | |
| 145 | /** |
| 146 | * Fetch the next set of rows from the database. |
| 147 | */ |
| 148 | public function next() { |
| 149 | if ( $this->results === null ) { |
| 150 | $this->results = $this->query(); |
| 151 | } |
| 152 | |
| 153 | $current = $this->results->fetchObject(); |
| 154 | if ( $current !== false ) { |
| 155 | $this->current = $this->transform( $current ); |
| 156 | $this->key++; |
| 157 | } else { |
| 158 | // end of iteration reached |
| 159 | $this->current = false; |
| 160 | $this->key = null; |
| 161 | } |
| 162 | } |
| 163 | |
| 164 | /** |
| 165 | * Transforms the DB row into a revision object. |
| 166 | * |
| 167 | * $row will be one of the results of static::query(). In this method, $row |
| 168 | * is expected to have at least properties `rev_id` & `rev_type`, which will |
| 169 | * be used to fetch this specific row's data from storage. |
| 170 | * |
| 171 | * This will need to do some DB/cache requests. Ideally, those would be |
| 172 | * bundled instead of being done on a per-row record. These iterators |
| 173 | * are only meant to be run in maintenance scripts, however, so it |
| 174 | * doesn't really matter that much ;) |
| 175 | * |
| 176 | * @param stdClass $row |
| 177 | * @return AbstractRevision |
| 178 | */ |
| 179 | protected function transform( stdClass $row ) { |
| 180 | $uuid = UUID::create( $row->rev_id ); |
| 181 | |
| 182 | /** @var ManagerGroup $storage */ |
| 183 | $storage = Container::get( 'storage' ); |
| 184 | |
| 185 | // prevent memory from being filled up |
| 186 | $storage->clear(); |
| 187 | |
| 188 | return $storage->getStorage( $row->rev_type )->get( $uuid ); |
| 189 | } |
| 190 | } |