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| 1 | <?php |
| 2 | |
| 3 | namespace CirrusSearch\Search; |
| 4 | |
| 5 | use CirrusSearch\Connection; |
| 6 | use CirrusSearch\Util; |
| 7 | use Elastica\Index; |
| 8 | use Elastica\Query; |
| 9 | use MediaWiki\Logger\LoggerFactory; |
| 10 | |
| 11 | /** |
| 12 | * Build the search request body |
| 13 | */ |
| 14 | class SearchRequestBuilder { |
| 15 | /** @var SearchContext */ |
| 16 | private $searchContext; |
| 17 | |
| 18 | /** @var Connection */ |
| 19 | private $connection; |
| 20 | |
| 21 | /** @var string */ |
| 22 | private $indexBaseName; |
| 23 | |
| 24 | /** @var int */ |
| 25 | private $offset = 0; |
| 26 | |
| 27 | /** @var int */ |
| 28 | private $limit = 20; |
| 29 | |
| 30 | /** @var string search timeout, string with time and unit, e.g. 20s for 20 seconds */ |
| 31 | private $timeout; |
| 32 | |
| 33 | /** |
| 34 | * @var Index|null force the index when set, use {@link Connection::pickIndexSuffixForNamespaces} |
| 35 | */ |
| 36 | private $index; |
| 37 | |
| 38 | /** @var string set the sort option, controls the use of rescore functions or elastic sort */ |
| 39 | private $sort = 'relevance'; |
| 40 | |
| 41 | /** |
| 42 | * @param SearchContext $searchContext |
| 43 | * @param Connection $connection |
| 44 | * @param string $indexBaseName |
| 45 | */ |
| 46 | public function __construct( SearchContext $searchContext, Connection $connection, $indexBaseName ) { |
| 47 | $this->searchContext = $searchContext; |
| 48 | $this->connection = $connection; |
| 49 | $this->indexBaseName = $indexBaseName; |
| 50 | } |
| 51 | |
| 52 | /** |
| 53 | * Build the search request |
| 54 | * @return \Elastica\Search |
| 55 | */ |
| 56 | public function build() { |
| 57 | $resultsType = $this->searchContext->getResultsType(); |
| 58 | |
| 59 | $query = new Query(); |
| 60 | // Track at least offset + limit + 1 hits if precise total_hits is not requested |
| 61 | // This useful to know if more results are available on the next page |
| 62 | $query->setTrackTotalHits( $this->searchContext->getTrackTotalHits() ? true : $this->offset + $this->limit + 1 ); |
| 63 | $query->setSource( $resultsType->getSourceFiltering() ); |
| 64 | $query->setParam( "fields", $resultsType->getFields() ); |
| 65 | |
| 66 | $extraIndexes = $this->searchContext->getExtraIndices(); |
| 67 | |
| 68 | if ( $extraIndexes && $this->searchContext->getConfig()->getElement( 'CirrusSearchDeduplicateInQuery' ) !== false ) { |
| 69 | $this->searchContext->addNotFilter( new \Elastica\Query\Term( |
| 70 | [ 'local_sites_with_dupe' => $this->indexBaseName ] |
| 71 | ) ); |
| 72 | } |
| 73 | |
| 74 | $mainQuery = $this->searchContext->getQuery(); |
| 75 | $query->setQuery( $mainQuery ); |
| 76 | |
| 77 | foreach ( $this->searchContext->getAggregations() as $agg ) { |
| 78 | $query->addAggregation( $agg ); |
| 79 | } |
| 80 | |
| 81 | $highlight = $this->searchContext->getHighlight( $resultsType, $mainQuery ); |
| 82 | if ( $highlight ) { |
| 83 | $query->setHighlight( $highlight ); |
| 84 | } |
| 85 | |
| 86 | $suggestQueries = $this->searchContext->getFallbackRunner()->getElasticSuggesters(); |
| 87 | if ( $suggestQueries ) { |
| 88 | $query->setParam( 'suggest', [ |
| 89 | // TODO: remove special case on 1-elt array, added to not change the test fixtures |
| 90 | // We should switch to explicit naming |
| 91 | 'suggest' => count( $suggestQueries ) === 1 ? reset( $suggestQueries ) : $suggestQueries |
| 92 | ] ); |
| 93 | $query->addParam( 'stats', 'suggest' ); |
| 94 | } |
| 95 | |
| 96 | foreach ( $this->searchContext->getSyntaxUsed() as $syntax ) { |
| 97 | $query->addParam( 'stats', $syntax ); |
| 98 | } |
| 99 | |
| 100 | // See also CirrusSearch::getValidSorts() |
| 101 | switch ( $this->sort ) { |
| 102 | case 'just_match': |
| 103 | // Use just matching scores, without any rescoring, and default sort. |
| 104 | break; |
| 105 | case 'relevance': |
| 106 | // Add some rescores to improve relevance |
| 107 | $rescores = $this->searchContext->getRescore(); |
| 108 | if ( $rescores !== [] ) { |
| 109 | $query->setParam( 'rescore', $rescores ); |
| 110 | } |
| 111 | break; // The default |
| 112 | case 'create_timestamp_asc': |
| 113 | $query->setSort( [ 'create_timestamp' => 'asc' ] ); |
| 114 | break; |
| 115 | case 'create_timestamp_desc': |
| 116 | $query->setSort( [ 'create_timestamp' => 'desc' ] ); |
| 117 | break; |
| 118 | case 'last_edit_asc': |
| 119 | $query->setSort( [ 'timestamp' => 'asc' ] ); |
| 120 | break; |
| 121 | case 'last_edit_desc': |
| 122 | $query->setSort( [ 'timestamp' => 'desc' ] ); |
| 123 | break; |
| 124 | case 'incoming_links_asc': |
| 125 | $query->setSort( [ 'incoming_links' => [ |
| 126 | 'order' => 'asc', |
| 127 | 'missing' => '_first', |
| 128 | ] ] ); |
| 129 | break; |
| 130 | case 'incoming_links_desc': |
| 131 | $query->setSort( [ 'incoming_links' => [ |
| 132 | 'order' => 'desc', |
| 133 | 'missing' => '_last', |
| 134 | ] ] ); |
| 135 | break; |
| 136 | case 'none': |
| 137 | // Return documents in index order |
| 138 | $query->setSort( [ '_doc' ] ); |
| 139 | break; |
| 140 | case 'random': |
| 141 | $randomSeed = $this->searchContext->getSearchQuery()->getRandomSeed(); |
| 142 | if ( $randomSeed === null && $this->offset !== 0 ) { |
| 143 | $this->searchContext->addWarning( 'cirrussearch-offset-not-allowed-with-random-sort' ); |
| 144 | $this->offset = 0; |
| 145 | } |
| 146 | // Can't use an empty array, it would JSONify to [] instead of {}. |
| 147 | $scoreParams = ( $randomSeed === null ) ? (object)[] : [ 'seed' => $randomSeed, 'field' => '_seq_no' ]; |
| 148 | // Instead of setting a sort field wrap the whole query in a |
| 149 | // bool filter and add a must clause for the random score. This |
| 150 | // could alternatively be a rescore over a limited document |
| 151 | // set, but in basic testing the filter was more performant |
| 152 | // than an 8k rescore window even with 50M total hits. |
| 153 | $query->setQuery( ( new Query\BoolQuery() ) |
| 154 | ->addFilter( $mainQuery ) |
| 155 | ->addMust( ( new Query\FunctionScore() ) |
| 156 | ->setQuery( new Query\MatchAll() ) |
| 157 | ->addFunction( 'random_score', $scoreParams ) ) ); |
| 158 | |
| 159 | break; |
| 160 | case 'user_random': |
| 161 | // Randomly ordered, but consistent for a single user |
| 162 | $query->setQuery( ( new Query\BoolQuery() ) |
| 163 | ->addFilter( $mainQuery ) |
| 164 | ->addMust( ( new Query\FunctionScore() ) |
| 165 | ->setQuery( new Query\MatchAll() ) |
| 166 | ->addFunction( 'random_score', [ |
| 167 | 'seed' => Util::generateIdentToken(), |
| 168 | 'field' => '_seq_no', |
| 169 | ] ) ) ); |
| 170 | break; |
| 171 | |
| 172 | case 'title_natural_asc': |
| 173 | case 'title_natural_desc': |
| 174 | if ( $this->searchContext->getConfig()->getElement( 'CirrusSearchNaturalTitleSort', 'use' ) ) { |
| 175 | $query->setSort( [ |
| 176 | 'title.natural_sort' => explode( '_', $this->sort, 3 )[2], |
| 177 | ] ); |
| 178 | break; |
| 179 | } |
| 180 | // Intentional fall-through to default error case. |
| 181 | |
| 182 | default: |
| 183 | // Same as just_match. No user warning since an invalid sort |
| 184 | // getting this far is a bug in the calling code which should |
| 185 | // be validating it's input. |
| 186 | LoggerFactory::getInstance( 'CirrusSearch' )->warning( |
| 187 | "Invalid sort type: {sort}", |
| 188 | [ 'sort' => $this->sort ] |
| 189 | ); |
| 190 | } |
| 191 | |
| 192 | if ( $this->offset ) { |
| 193 | $query->setFrom( $this->offset ); |
| 194 | } |
| 195 | if ( $this->limit ) { |
| 196 | $query->setSize( $this->limit ); |
| 197 | } |
| 198 | |
| 199 | // Setup the search |
| 200 | $queryOptions = []; |
| 201 | if ( $this->timeout ) { |
| 202 | $queryOptions[\Elastica\Search::OPTION_TIMEOUT] = $this->timeout; |
| 203 | } |
| 204 | // @todo when switching to multi-search this has to be provided at the top level |
| 205 | if ( $this->searchContext->getConfig()->get( 'CirrusSearchMoreAccurateScoringMode' ) ) { |
| 206 | $queryOptions[\Elastica\Search::OPTION_SEARCH_TYPE] = \Elastica\Search::OPTION_SEARCH_TYPE_DFS_QUERY_THEN_FETCH; |
| 207 | } |
| 208 | |
| 209 | $search = $this->getIndex()->createSearch( $query, $queryOptions ); |
| 210 | $crossClusterName = $this->connection->getConfig()->getClusterAssignment()->getCrossClusterName(); |
| 211 | foreach ( $extraIndexes as $i ) { |
| 212 | $search->addIndex( $this->connection->getIndex( $i->getSearchIndex( $crossClusterName ) ) ); |
| 213 | } |
| 214 | |
| 215 | $this->searchContext->getDebugOptions()->applyDebugOptions( $query ); |
| 216 | return $search; |
| 217 | } |
| 218 | |
| 219 | /** |
| 220 | * @return int |
| 221 | */ |
| 222 | public function getOffset() { |
| 223 | return $this->offset; |
| 224 | } |
| 225 | |
| 226 | /** |
| 227 | * @param int $offset |
| 228 | * @return self |
| 229 | */ |
| 230 | public function setOffset( $offset ) { |
| 231 | $this->offset = $offset; |
| 232 | |
| 233 | return $this; |
| 234 | } |
| 235 | |
| 236 | /** |
| 237 | * @return int |
| 238 | */ |
| 239 | public function getLimit() { |
| 240 | return $this->limit; |
| 241 | } |
| 242 | |
| 243 | /** |
| 244 | * @param int $limit |
| 245 | * @return self |
| 246 | */ |
| 247 | public function setLimit( $limit ) { |
| 248 | $this->limit = $limit; |
| 249 | |
| 250 | return $this; |
| 251 | } |
| 252 | |
| 253 | /** |
| 254 | * @return string |
| 255 | */ |
| 256 | public function getTimeout() { |
| 257 | return $this->timeout; |
| 258 | } |
| 259 | |
| 260 | /** |
| 261 | * @param string $timeout |
| 262 | * @return self |
| 263 | */ |
| 264 | public function setTimeout( $timeout ) { |
| 265 | $this->timeout = $timeout; |
| 266 | |
| 267 | return $this; |
| 268 | } |
| 269 | |
| 270 | /** |
| 271 | * @return \Elastica\Index An elastica type suitable for searching against |
| 272 | * the configured wiki over the host wiki's default connection. |
| 273 | */ |
| 274 | public function getIndex(): \Elastica\Index { |
| 275 | if ( $this->index ) { |
| 276 | return $this->index; |
| 277 | } else { |
| 278 | $indexBaseName = $this->indexBaseName; |
| 279 | $config = $this->searchContext->getConfig(); |
| 280 | $hostConfig = $config->getHostWikiConfig(); |
| 281 | $indexSuffix = $this->connection->pickIndexSuffixForNamespaces( |
| 282 | $this->searchContext->getNamespaces() ); |
| 283 | if ( $hostConfig->get( 'CirrusSearchCrossClusterSearch' ) ) { |
| 284 | $local = $hostConfig->getClusterAssignment()->getCrossClusterName(); |
| 285 | $current = $config->getClusterAssignment()->getCrossClusterName(); |
| 286 | if ( $local !== $current ) { |
| 287 | $indexBaseName = $current . ':' . $indexBaseName; |
| 288 | } |
| 289 | } |
| 290 | return $this->connection->getIndex( $indexBaseName, $indexSuffix ); |
| 291 | } |
| 292 | } |
| 293 | |
| 294 | /** |
| 295 | * @param ?Index $index |
| 296 | * @return $this |
| 297 | */ |
| 298 | public function setIndex( ?Index $index ): self { |
| 299 | $this->index = $index; |
| 300 | return $this; |
| 301 | } |
| 302 | |
| 303 | /** |
| 304 | * @return string |
| 305 | */ |
| 306 | public function getSort() { |
| 307 | return $this->sort; |
| 308 | } |
| 309 | |
| 310 | /** |
| 311 | * @param string $sort |
| 312 | * @return self |
| 313 | */ |
| 314 | public function setSort( $sort ) { |
| 315 | $this->sort = $sort; |
| 316 | |
| 317 | return $this; |
| 318 | } |
| 319 | |
| 320 | /** |
| 321 | * @return SearchContext |
| 322 | */ |
| 323 | public function getSearchContext() { |
| 324 | return $this->searchContext; |
| 325 | } |
| 326 | } |