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<?php |
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namespace Wikibase\TermStore\MediaWiki\PackagePrivate; |
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use InvalidArgumentException; |
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use LogicException; |
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use stdClass; |
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use Wikimedia\Rdbms\IDatabase; |
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use Wikimedia\Rdbms\ILoadBalancer; |
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use Wikimedia\Rdbms\IResultWrapper; |
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/** |
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* Term ID resolver using the normalized database schema. |
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* |
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* @license GPL-2.0-or-later |
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*/ |
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class DatabaseTermIdsResolver implements TermIdsResolver { |
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/** @var TypeIdsResolver */ |
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private $typeIdsResolver; |
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/** @var ILoadBalancer */ |
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private $lb; |
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/** @var bool */ |
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private $allowMasterFallback; |
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/** @var IDatabase */ |
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private $dbr = null; |
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/** @var IDatabase */ |
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private $dbw = null; |
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/** @var string[] stash of data returned from the {@link TypeIdsResolver} */ |
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private $typeNames = []; |
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/** |
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* @param TypeIdsResolver $typeIdsResolver |
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* @param ILoadBalancer $lb |
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* @param bool $allowMasterFallback Whether to fall back to the master database if the data from |
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* the replica database is detected to be stale. |
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*/ |
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public function __construct( |
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TypeIdsResolver $typeIdsResolver, |
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ILoadBalancer $lb, |
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$allowMasterFallback = false |
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) { |
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$this->typeIdsResolver = $typeIdsResolver; |
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$this->lb = $lb; |
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$this->allowMasterFallback = $allowMasterFallback; |
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} |
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/* |
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* Term data is first read from the replica; if that returns less rows than we asked for, then |
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* there are some new rows in the master that were not yet replicated, and we fall back to the |
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* master if allowed. As the internal relations of the term store never change (for example, a |
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* term_in_lang row will never suddenly point to a different text_in_lang), a master fallback |
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* should never be necessary in any other case. However, callers need to consider where they |
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* got the list of term IDs they pass into this method from: if it’s from a replica, they may |
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* still see outdated data overall. |
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*/ |
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public function resolveTermIds( array $termIds ): array { |
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$terms = []; |
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$replicaResult = $this->selectTerms( $this->getDbr(), $termIds ); |
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$this->preloadTypes( $replicaResult ); |
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$replicaTermIds = []; |
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foreach ( $replicaResult as $row ) { |
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$replicaTermIds[] = $row->wbtl_id; |
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$this->addResultTerms( $terms, $row ); |
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} |
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if ( $this->allowMasterFallback && count( $replicaTermIds ) !== count( $termIds ) ) { |
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$masterTermIds = array_values( array_diff( $termIds, $replicaTermIds ) ); |
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$masterResult = $this->selectTerms( $this->getDbw(), $masterTermIds ); |
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$this->preloadTypes( $masterResult ); |
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foreach ( $masterResult as $row ) { |
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$this->addResultTerms( $terms, $row ); |
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} |
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} |
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return $terms; |
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} |
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private function selectTerms( IDatabase $db, array $termIds ): IResultWrapper { |
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return $db->select( |
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[ 'wbt_term_in_lang', 'wbt_text_in_lang', 'wbt_text' ], |
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[ 'wbtl_id', 'wbtl_type_id', 'wbxl_language', 'wbx_text' ], |
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[ |
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'wbtl_id' => $termIds, |
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// join conditions |
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'wbtl_text_in_lang_id=wbxl_id', |
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'wbxl_text_id=wbx_id', |
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], |
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__METHOD__ |
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); |
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} |
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private function preloadTypes( IResultWrapper $result ) { |
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$typeIds = []; |
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foreach ( $result as $row ) { |
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$typeId = $row->wbtl_type_id; |
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if ( !array_key_exists( $typeId, $this->typeNames ) ) { |
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$typeIds[$typeId] = true; |
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} |
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} |
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$this->typeNames += $this->typeIdsResolver->resolveTypeIds( array_keys( $typeIds ) ); |
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} |
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private function addResultTerms( array &$terms, stdClass $row ) { |
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$type = $this->lookupType( $row->wbtl_type_id ); |
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$lang = $row->wbxl_language; |
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$text = $row->wbx_text; |
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$terms[$type][$lang][] = $text; |
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} |
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private function lookupType( $typeId ) { |
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$typeName = $this->typeNames[$typeId] ?? null; |
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if ( $typeName === null ) { |
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throw new InvalidArgumentException( |
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'Type ID ' . $typeId . ' was requested but not preloaded!' ); |
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} |
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return $typeName; |
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} |
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private function getDbr() { |
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if ( $this->dbr === null ) { |
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$this->dbr = $this->lb->getConnection( ILoadBalancer::DB_REPLICA ); |
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} |
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return $this->dbr; |
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} |
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private function getDbw() { |
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if ( !$this->allowMasterFallback ) { |
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throw new LogicException( 'Master fallback not allowed!' ); |
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} |
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if ( $this->dbw === null ) { |
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$this->dbw = $this->lb->getConnection( ILoadBalancer::DB_MASTER ); |
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} |
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return $this->dbw; |
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} |
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} |
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wmde /
mediawiki-term-store
