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<?php |
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namespace Bardex\Elastic; |
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use Elasticsearch\Client as ElasticClient; |
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use Psr\Log\LoggerInterface; |
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use Psr\Log\NullLogger; |
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/** |
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* Class Query |
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* @package Bardex\Elastic |
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* @author Alexey Sumin <[email protected]> |
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*/ |
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abstract class Query implements \JsonSerializable |
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{ |
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/** |
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* @var ElasticClient $client |
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*/ |
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protected $elastic; |
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/** |
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* @var array |
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*/ |
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protected $listeners = []; |
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/** |
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* Получить собранный elasticsearch-запрос |
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* @return array |
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*/ |
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abstract public function getQuery(); |
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/** |
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* Отправить запрос на конкретный endpoint elasticsearch-сервера |
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* @param array $query |
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* @return array |
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*/ |
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abstract protected function executeQuery(array $query); |
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/** |
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* Конструктор |
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* @param ElasticClient $elastic |
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*/ |
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public function __construct(ElasticClient $elastic) |
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{ |
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$this->elastic = $elastic; |
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} |
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/** |
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* Выполнить запрос к ES и вернуть результаты поиска. |
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* @return SearchResult - возвращает набор документов |
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*/ |
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public function fetchAll() |
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{ |
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$response = $this->fetchRaw(); |
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$result = $this->createSearchResult($response); |
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return $result; |
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} |
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/** |
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* Выполнить запрос к ES и вернуть необработанный результат (с мета-данными). |
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* @return array возвращает необработанный ответ ES |
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*/ |
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public function fetchRaw() |
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{ |
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// build query |
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$query = $this->getQuery(); |
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// send query to elastic |
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$start = microtime(1); |
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try { |
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$result = $this->executeQuery($query); |
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$time = round((microtime(1) - $start) * 1000); |
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$this->triggerSuccess($query, $result, $time); |
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return $result; |
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} |
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catch (\Exception $e) { |
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$this->triggerError($query, $e); |
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throw $e; |
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} |
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} |
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/** |
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* Создать из ответа ES-сервера экземляр SearchResult |
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* @param array $response |
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* @return SearchResult |
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*/ |
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protected function createSearchResult(array $response) |
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{ |
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$results = $this->extractDocuments($response); |
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$total = $this->extractTotal($response); |
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$searchResult = new SearchResult($results, $total); |
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return $searchResult; |
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} |
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/** |
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* Выбрать документы из ответа ES-сервера и добавить script fields. |
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* @param array $response - ответ ES сервера. |
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* @return array - возвращает набор документов |
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*/ |
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protected function extractDocuments(array $response) |
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{ |
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$results = []; |
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if (isset($response['hits']['hits'])) { |
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foreach ($response['hits']['hits'] as $hit) { |
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$row = $hit['_source']; |
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if (isset($hit['fields'])) { // script fields |
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foreach ($hit['fields'] as $field => $data) { |
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if (count($data) == 1) { |
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$row[$field] = array_shift($data); |
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} else { |
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$row[$field] = $data; |
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} |
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} |
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} |
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$results[] = $row; |
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} |
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} |
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return $results; |
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} |
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/** |
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* Выбрать из ответа ES-сервера количество найденных документов. |
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* @param array $response - ответ ES сервера. |
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* @return integer - возвращает количество найденных документов. |
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*/ |
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protected function extractTotal(array $response) |
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{ |
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$total = 0; |
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if (isset($response['hits']['total'])) { |
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$total = $response['hits']['total']; |
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} |
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return $total; |
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} |
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public function addListener(IListener $listener) |
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{ |
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$this->listeners[] = $listener; |
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return $this; |
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} |
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public function removeListener(IListener $listener) |
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{ |
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foreach ($this->listeners as $i => $listItem) { |
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if ($listener === $listItem) { |
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unset($this->listeners[$i]); |
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} |
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} |
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return $this; |
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} |
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protected function triggerSuccess(array $query, array $response, $time) |
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{ |
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foreach ($this->listeners as $listener) { |
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$listener->onSuccess($query, $response, $time); |
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} |
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} |
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protected function triggerError(array $query, \Exception $e) |
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{ |
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foreach ($this->listeners as $listener) { |
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$listener->onError($query, $e); |
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} |
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} |
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/** |
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* Имплементация \JsonSerializable |
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* @return array |
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*/ |
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public function jsonSerialize() |
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{ |
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return $this->getQuery(); |
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} |
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} |
bardex /
elastic-query
