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<?php |
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declare(strict_types=1); |
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namespace BEdita\ElasticSearch\Adapter; |
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use BEdita\Core\Search\BaseAdapter; |
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use Cake\Database\Connection; |
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use Cake\Database\Expression\ComparisonExpression; |
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use Cake\Database\Expression\IdentifierExpression; |
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use Cake\Database\Schema\TableSchema; |
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use Cake\Datasource\EntityInterface; |
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use Cake\Log\LogTrait; |
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use Cake\ORM\Locator\LocatorAwareTrait; |
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use Cake\ORM\Query; |
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use Cake\ORM\Table; |
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use Cake\Utility\Security; |
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use Exception; |
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use Psr\Log\LogLevel; |
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class ElasticSearchAdapter extends BaseAdapter |
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{ |
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use LocatorAwareTrait; |
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use LogTrait; |
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/** |
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* @inheritDoc |
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*/ |
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public function search(Query $query, string $text, array $options = [], array $config = []): Query |
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{ |
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return $this->buildQuery($query, $text, $options); |
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} |
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/** |
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* {@inheritDoc} |
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* |
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* @codeCoverageIgnore |
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*/ |
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public function indexResource(EntityInterface $entity, string $operation): void |
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{ |
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} |
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/** |
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* Build elastic search query |
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* |
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* @param string $text The search text |
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* @param array $options The options |
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* @return array |
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*/ |
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protected function buildElasticSearchQuery(string $text, array $options): array |
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{ |
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return []; |
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} |
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/** |
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* Build query and return it |
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* |
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* @param \Cake\ORM\Query $query The query |
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* @param string $text The search text |
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* @param array $options The options |
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* @return \Cake\ORM\Query |
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*/ |
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protected function buildQuery(Query $query, string $text, array $options): Query |
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{ |
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$results = $this->buildElasticSearchQuery($text, $options); |
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if (count($results) === 0) { |
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// Nothing found. No results should be returned. Add a contradiction to the `WHERE` clause. |
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return $query->where(new ComparisonExpression('1', '1', 'integer', '<>')); |
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} |
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// Prepare temporary table with `id` and `score` from ElasticSearch results. |
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$tempTable = $this->createTempTable($query->getConnection()); |
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$insertQuery = $tempTable->query()->insert(['id', 'score']); |
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foreach ($results as $row) { |
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$insertQuery = $insertQuery->values($row); |
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} |
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$insertQuery->execute(); |
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// Add a join with the temporary table to filter by ID and sort by relevance score. |
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return $query |
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->innerJoin( |
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$tempTable->getTable(), |
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new ComparisonExpression( |
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new IdentifierExpression($tempTable->aliasField('id')), |
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new IdentifierExpression($query->getRepository()->aliasField('id')), |
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'integer', |
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'=' |
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) |
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) |
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->orderDesc($tempTable->aliasField('score')); |
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} |
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/** |
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* Create a temporary table to store search results. |
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* The table is created with a `score` column to sort results by relevance. |
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* The table is dropped when the connection is closed. |
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* Returns `null` if the table cannot be created. |
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* |
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* @param \Cake\Database\Connection $connection The database connection |
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* @return \Cake\ORM\Table|null |
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*/ |
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protected function createTempTable(Connection $connection): ?Table |
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{ |
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$table = sprintf('elasticsearch_%s', Security::randomString(16)); |
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$schema = (new TableSchema($table)) |
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->setTemporary(true) |
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->addColumn('id', [ |
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'type' => TableSchema::TYPE_INTEGER, |
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'length' => 11, |
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'unsigned' => true, |
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'null' => false, |
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]) |
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->addColumn('score', [ |
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'type' => TableSchema::TYPE_FLOAT, |
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'null' => false, |
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]) |
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->addConstraint( |
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'PRIMARY', |
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[ |
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'type' => TableSchema::CONSTRAINT_PRIMARY, |
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'columns' => ['id'], |
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] |
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) |
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->addIndex( |
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sprintf('%s_score_idx', str_replace('_', '', $table)), |
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[ |
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'type' => TableSchema::INDEX_INDEX, |
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'columns' => ['score'], |
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] |
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); |
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try { |
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// Execute SQL to create table. In MySQL the transaction is completely useless, |
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// because `CREATE TABLE` implicitly implies a commit. |
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$connection->transactional(function (Connection $connection) use ($schema): void { |
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foreach ($schema->createSql($connection) as $statement) { |
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$connection->execute($statement); |
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} |
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}); |
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} catch (Exception $e) { |
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$this->log($e->getMessage(), LogLevel::CRITICAL); |
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return null; |
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} |
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return (new Table(compact('connection', 'table', 'schema'))) |
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->setPrimaryKey('id') |
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->setDisplayField('score'); |
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} |
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} |
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bedita /
elastic-search
