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| 1 | <?php |
| 2 | |
| 3 | namespace CirrusSearch\Search; |
| 4 | |
| 5 | use BaseSearchResultSet; |
| 6 | use HtmlArmor; |
| 7 | use MediaWiki\MediaWikiServices; |
| 8 | use MediaWiki\Title\Title; |
| 9 | use SearchResult; |
| 10 | use SearchResultSetTrait; |
| 11 | use Wikimedia\Assert\Assert; |
| 12 | |
| 13 | /** |
| 14 | * Base class to represent a CirrusSearchResultSet |
| 15 | * Extensions willing to feed Cirrus with a CirrusSearchResultSet must extend this class. |
| 16 | */ |
| 17 | abstract class BaseCirrusSearchResultSet extends BaseSearchResultSet implements CirrusSearchResultSet { |
| 18 | use SearchResultSetTrait; |
| 19 | |
| 20 | /** @var bool */ |
| 21 | private $hasMoreResults = false; |
| 22 | |
| 23 | /** |
| 24 | * @var CirrusSearchResult[]|null |
| 25 | */ |
| 26 | private $results; |
| 27 | |
| 28 | /** |
| 29 | * @var string|null |
| 30 | */ |
| 31 | private $suggestionQuery; |
| 32 | |
| 33 | /** |
| 34 | * @var HtmlArmor|string|null |
| 35 | */ |
| 36 | private $suggestionSnippet; |
| 37 | |
| 38 | /** |
| 39 | * @var array<int,array<string,CirrusSearchResultSet>> |
| 40 | */ |
| 41 | private $interwikiResults = []; |
| 42 | |
| 43 | /** |
| 44 | * @var string|null |
| 45 | */ |
| 46 | private $rewrittenQuery; |
| 47 | |
| 48 | /** |
| 49 | * @var HtmlArmor|string|null |
| 50 | */ |
| 51 | private $rewrittenQuerySnippet; |
| 52 | |
| 53 | /** |
| 54 | * @var TitleHelper |
| 55 | */ |
| 56 | private $titleHelper; |
| 57 | |
| 58 | /** |
| 59 | * @param \Elastica\Result $result Result from search engine |
| 60 | * @return CirrusSearchResult|null Elasticsearch result transformed into mediawiki |
| 61 | * search result object. |
| 62 | */ |
| 63 | abstract protected function transformOneResult( \Elastica\Result $result ); |
| 64 | |
| 65 | /** |
| 66 | * @return bool True when there are more pages of search results available. |
| 67 | */ |
| 68 | final public function hasMoreResults() { |
| 69 | return $this->hasMoreResults; |
| 70 | } |
| 71 | |
| 72 | /** |
| 73 | * @param string $suggestionQuery |
| 74 | * @param HtmlArmor|string|null $suggestionSnippet |
| 75 | */ |
| 76 | final public function setSuggestionQuery( string $suggestionQuery, $suggestionSnippet = null ) { |
| 77 | $this->suggestionQuery = $suggestionQuery; |
| 78 | $this->suggestionSnippet = $suggestionSnippet ?? $suggestionQuery; |
| 79 | } |
| 80 | |
| 81 | /** |
| 82 | * Loads the result set into the mediawiki LinkCache via a |
| 83 | * batch query. By pre-caching this we ensure methods such as |
| 84 | * Result::isMissingRevision() don't trigger a query for each and |
| 85 | * every search result. |
| 86 | * |
| 87 | * @param \Elastica\ResultSet $resultSet Result set from which the titles come |
| 88 | */ |
| 89 | private function preCacheContainedTitles( \Elastica\ResultSet $resultSet ) { |
| 90 | // We can only pull in information about the local wiki |
| 91 | $lb = MediaWikiServices::getInstance()->getLinkBatchFactory()->newLinkBatch(); |
| 92 | foreach ( $resultSet->getResults() as $result ) { |
| 93 | if ( !$this->getTitleHelper()->isExternal( $result ) |
| 94 | && isset( $result->namespace ) |
| 95 | && isset( $result->title ) |
| 96 | ) { |
| 97 | $lb->add( $result->namespace, $result->title ); |
| 98 | } |
| 99 | } |
| 100 | if ( !$lb->isEmpty() ) { |
| 101 | $lb->setCaller( __METHOD__ ); |
| 102 | $lb->execute(); |
| 103 | } |
| 104 | } |
| 105 | |
| 106 | /** |
| 107 | * @param bool $searchContainedSyntax |
| 108 | * @return CirrusSearchResultSet an empty result set |
| 109 | */ |
| 110 | final public static function emptyResultSet( $searchContainedSyntax = false ) { |
| 111 | return new EmptySearchResultSet( $searchContainedSyntax ); |
| 112 | } |
| 113 | |
| 114 | /** |
| 115 | * @param int $limit Shrink result set to $limit and flag |
| 116 | * if more results are available. |
| 117 | */ |
| 118 | final public function shrink( $limit ) { |
| 119 | if ( $this->count() > $limit ) { |
| 120 | Assert::precondition( $this->results !== null, "results not initialized" ); |
| 121 | $this->results = array_slice( $this->results, 0, $limit ); |
| 122 | $this->hasMoreResults = true; |
| 123 | } |
| 124 | } |
| 125 | |
| 126 | /** |
| 127 | * @return CirrusSearchResult[]|SearchResult[] |
| 128 | */ |
| 129 | final public function extractResults() { |
| 130 | if ( $this->results === null ) { |
| 131 | $this->results = []; |
| 132 | $elasticaResults = $this->getElasticaResultSet(); |
| 133 | if ( $elasticaResults !== null ) { |
| 134 | $this->preCacheContainedTitles( $elasticaResults ); |
| 135 | foreach ( $elasticaResults->getResults() as $result ) { |
| 136 | $transformed = $this->transformOneResult( $result ); |
| 137 | if ( $transformed !== null ) { |
| 138 | $this->augmentResult( $transformed ); |
| 139 | $this->results[] = $transformed; |
| 140 | } |
| 141 | } |
| 142 | } |
| 143 | } |
| 144 | return $this->results; |
| 145 | } |
| 146 | |
| 147 | /** |
| 148 | * Extract all the titles in the result set. |
| 149 | * @return Title[] |
| 150 | */ |
| 151 | final public function extractTitles() { |
| 152 | return array_map( |
| 153 | static function ( SearchResult $result ) { |
| 154 | return $result->getTitle(); |
| 155 | }, |
| 156 | $this->extractResults() ); |
| 157 | } |
| 158 | |
| 159 | /** |
| 160 | * @param CirrusSearchResultSet $res |
| 161 | * @param int $type One of the ISearchResultSet::…_RESULTS constants |
| 162 | * @param string $interwiki |
| 163 | */ |
| 164 | final public function addInterwikiResults( CirrusSearchResultSet $res, $type, $interwiki ) { |
| 165 | $this->interwikiResults[$type][$interwiki] = $res; |
| 166 | } |
| 167 | |
| 168 | /** |
| 169 | * @param int $type One of the ISearchResultSet::…_RESULTS constants |
| 170 | * @return \ISearchResultSet[] |
| 171 | */ |
| 172 | final public function getInterwikiResults( $type = self::SECONDARY_RESULTS ) { |
| 173 | return $this->interwikiResults[$type] ?? []; |
| 174 | } |
| 175 | |
| 176 | /** |
| 177 | * @param int $type One of the ISearchResultSet::…_RESULTS constants |
| 178 | * @return bool |
| 179 | */ |
| 180 | final public function hasInterwikiResults( $type = self::SECONDARY_RESULTS ): bool { |
| 181 | return (bool)( $this->interwikiResults[$type] ?? [] ); |
| 182 | } |
| 183 | |
| 184 | /** |
| 185 | * @param string $newQuery |
| 186 | * @param HtmlArmor|string|null $newQuerySnippet |
| 187 | */ |
| 188 | final public function setRewrittenQuery( string $newQuery, $newQuerySnippet = null ) { |
| 189 | $this->rewrittenQuery = $newQuery; |
| 190 | $this->rewrittenQuerySnippet = $newQuerySnippet ?? $newQuery; |
| 191 | } |
| 192 | |
| 193 | /** |
| 194 | * @return bool |
| 195 | */ |
| 196 | final public function hasRewrittenQuery() { |
| 197 | return $this->rewrittenQuery !== null; |
| 198 | } |
| 199 | |
| 200 | /** |
| 201 | * @return string|null |
| 202 | */ |
| 203 | final public function getQueryAfterRewrite() { |
| 204 | return $this->rewrittenQuery; |
| 205 | } |
| 206 | |
| 207 | /** |
| 208 | * @return HtmlArmor|string|null |
| 209 | */ |
| 210 | final public function getQueryAfterRewriteSnippet() { |
| 211 | return $this->rewrittenQuerySnippet; |
| 212 | } |
| 213 | |
| 214 | /** |
| 215 | * @return bool |
| 216 | */ |
| 217 | final public function hasSuggestion() { |
| 218 | return $this->suggestionQuery !== null; |
| 219 | } |
| 220 | |
| 221 | /** |
| 222 | * @return string|null |
| 223 | */ |
| 224 | final public function getSuggestionQuery() { |
| 225 | return $this->suggestionQuery; |
| 226 | } |
| 227 | |
| 228 | /** |
| 229 | * @return string|null |
| 230 | */ |
| 231 | final public function getSuggestionSnippet() { |
| 232 | return $this->suggestionSnippet; |
| 233 | } |
| 234 | |
| 235 | /** |
| 236 | * Count elements of an object |
| 237 | * @link https://php.net/manual/en/countable.count.php |
| 238 | * @return int The custom count as an integer. |
| 239 | * @since 5.1.0 |
| 240 | */ |
| 241 | final public function count(): int { |
| 242 | return count( $this->extractResults() ); |
| 243 | } |
| 244 | |
| 245 | /** |
| 246 | * @return int |
| 247 | */ |
| 248 | final public function numRows() { |
| 249 | return $this->count(); |
| 250 | } |
| 251 | |
| 252 | /** |
| 253 | * Some search modes return a total hit count for the query |
| 254 | * in the entire article database. This may include pages |
| 255 | * in namespaces that would not be matched on the given |
| 256 | * settings. |
| 257 | * |
| 258 | * Return null if no total hits number is supported. |
| 259 | * |
| 260 | * @return int|null |
| 261 | */ |
| 262 | final public function getTotalHits() { |
| 263 | $elasticaResultSet = $this->getElasticaResultSet(); |
| 264 | if ( $elasticaResultSet !== null ) { |
| 265 | return $elasticaResultSet->getTotalHits(); |
| 266 | } |
| 267 | return 0; |
| 268 | } |
| 269 | |
| 270 | /** |
| 271 | * @inheritDoc |
| 272 | */ |
| 273 | public function isApproximateTotalHits(): bool { |
| 274 | $elasticaResultSet = $this->getElasticaResultSet(); |
| 275 | if ( $elasticaResultSet !== null ) { |
| 276 | return $elasticaResultSet->getTotalHitsRelation() !== 'eq'; |
| 277 | } |
| 278 | return false; |
| 279 | } |
| 280 | |
| 281 | /** |
| 282 | * @return \Elastica\Response|null |
| 283 | */ |
| 284 | final public function getElasticResponse() { |
| 285 | $elasticaResultSet = $this->getElasticaResultSet(); |
| 286 | return $elasticaResultSet != null ? $elasticaResultSet->getResponse() : null; |
| 287 | } |
| 288 | |
| 289 | /** |
| 290 | * Useful to inject your own TitleHelper during tests |
| 291 | * @return TitleHelper |
| 292 | */ |
| 293 | protected function getTitleHelper(): TitleHelper { |
| 294 | if ( $this->titleHelper === null ) { |
| 295 | $this->titleHelper = new TitleHelper(); |
| 296 | } |
| 297 | return $this->titleHelper; |
| 298 | } |
| 299 | } |