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| 1 | <?php |
| 2 | /** |
| 3 | * @license GPL-2.0-or-later |
| 4 | */ |
| 5 | |
| 6 | namespace CirrusSearch\Search\Rescore; |
| 7 | |
| 8 | use CirrusSearch\CirrusConfigNames; |
| 9 | use CirrusSearch\CirrusSearchHookRunner; |
| 10 | use CirrusSearch\Profile\ArrayPathSetter; |
| 11 | use CirrusSearch\Profile\SearchProfileService; |
| 12 | use CirrusSearch\Search\SearchContext; |
| 13 | use Elastica\Query\FunctionScore; |
| 14 | |
| 15 | class FunctionScoreChain { |
| 16 | /** |
| 17 | * List of allowed function_score param |
| 18 | * we keep boost and boost_mode even if they do not make sense |
| 19 | * here since we do not allow to specify the query param. |
| 20 | * The query will be MatchAll with a score to 1. |
| 21 | * |
| 22 | * @var string[] |
| 23 | */ |
| 24 | private static $functionScoreParams = [ |
| 25 | 'boost', |
| 26 | 'boost_mode', |
| 27 | 'max_boost', |
| 28 | 'score_mode', |
| 29 | 'min_score' |
| 30 | ]; |
| 31 | |
| 32 | /** |
| 33 | * @var SearchContext |
| 34 | */ |
| 35 | private $context; |
| 36 | |
| 37 | /** |
| 38 | * @var FunctionScoreDecorator |
| 39 | */ |
| 40 | private $functionScore; |
| 41 | |
| 42 | /** |
| 43 | * @var array the function score chain |
| 44 | */ |
| 45 | private $chain; |
| 46 | |
| 47 | /** |
| 48 | * @var string the name of the chain |
| 49 | */ |
| 50 | private $chainName; |
| 51 | /** |
| 52 | * @var CirrusSearchHookRunner |
| 53 | */ |
| 54 | private $cirrusSearchHookRunner; |
| 55 | |
| 56 | /** |
| 57 | * Builds a new function score chain. |
| 58 | * |
| 59 | * @param SearchContext $context |
| 60 | * @param string $chainName the name of the chain (must be a valid |
| 61 | * chain in wgCirrusSearchRescoreFunctionScoreChains) |
| 62 | * @param array $overrides Parameter overrides |
| 63 | * @param CirrusSearchHookRunner $cirrusSearchHookRunner |
| 64 | */ |
| 65 | public function __construct( SearchContext $context, $chainName, $overrides, CirrusSearchHookRunner $cirrusSearchHookRunner ) { |
| 66 | $this->chainName = $chainName; |
| 67 | $this->context = $context; |
| 68 | $this->functionScore = new FunctionScoreDecorator(); |
| 69 | $chain = $context->getConfig() |
| 70 | ->getProfileService() |
| 71 | ->loadProfileByName( SearchProfileService::RESCORE_FUNCTION_CHAINS, $chainName ); |
| 72 | $this->chain = $overrides ? $this->applyOverrides( $chain, $overrides ) : $chain; |
| 73 | |
| 74 | $params = array_intersect_key( $this->chain, array_flip( self::$functionScoreParams ) ); |
| 75 | foreach ( $params as $param => $value ) { |
| 76 | $this->functionScore->setParam( $param, $value ); |
| 77 | } |
| 78 | $this->cirrusSearchHookRunner = $cirrusSearchHookRunner; |
| 79 | } |
| 80 | |
| 81 | private function applyOverrides( array $chain, array $overrides ): array { |
| 82 | $transformer = new ArrayPathSetter( $overrides ); |
| 83 | return $transformer->transform( $chain ); |
| 84 | } |
| 85 | |
| 86 | /** |
| 87 | * @return FunctionScore|null the rescore query or null none of functions were |
| 88 | * needed. |
| 89 | * @throws InvalidRescoreProfileException |
| 90 | */ |
| 91 | public function buildRescoreQuery() { |
| 92 | if ( !isset( $this->chain['functions'] ) ) { |
| 93 | throw new InvalidRescoreProfileException( "No functions defined in chain {$this->chainName}." ); |
| 94 | } |
| 95 | foreach ( $this->chain['functions'] as $func ) { |
| 96 | $impl = $this->getImplementation( $func ); |
| 97 | $impl->append( $this->functionScore ); |
| 98 | } |
| 99 | // Add extensions |
| 100 | if ( !empty( $this->chain['add_extensions'] ) ) { |
| 101 | foreach ( $this->context->getExtraScoreBuilders() as $extBuilder ) { |
| 102 | $extBuilder->append( $this->functionScore ); |
| 103 | } |
| 104 | } |
| 105 | if ( !$this->functionScore->isEmptyFunction() ) { |
| 106 | return $this->functionScore; |
| 107 | } |
| 108 | return null; |
| 109 | } |
| 110 | |
| 111 | /** |
| 112 | * @param array $func |
| 113 | * @return BoostFunctionBuilder |
| 114 | * @throws InvalidRescoreProfileException |
| 115 | */ |
| 116 | private function getImplementation( $func ) { |
| 117 | $weight = $func['weight'] ?? 1; |
| 118 | $config = $this->context->getConfig(); |
| 119 | switch ( $func['type'] ) { |
| 120 | case 'boostlinks': |
| 121 | return new IncomingLinksFunctionScoreBuilder(); |
| 122 | case 'recency': |
| 123 | foreach ( $this->context->getExtraScoreBuilders() as $boostFunctionBuilder ) { |
| 124 | if ( $boostFunctionBuilder instanceof PreferRecentFunctionScoreBuilder ) { |
| 125 | // If prefer-recent was used as a keyword we don't send the one |
| 126 | // from the profile |
| 127 | return new BoostedQueriesFunction( [], [] ); |
| 128 | } |
| 129 | } |
| 130 | |
| 131 | $preferRecentDecayPortion = $config->get( CirrusConfigNames::PreferRecentDefaultDecayPortion ); |
| 132 | $preferRecentHalfLife = 0; |
| 133 | if ( $preferRecentDecayPortion > 0 ) { |
| 134 | $preferRecentHalfLife = $config->get( CirrusConfigNames::PreferRecentDefaultHalfLife ); |
| 135 | } |
| 136 | return new PreferRecentFunctionScoreBuilder( $config, $weight, |
| 137 | $preferRecentHalfLife, $preferRecentDecayPortion ); |
| 138 | case 'templates': |
| 139 | $withDefaultBoosts = true; |
| 140 | foreach ( $this->context->getExtraScoreBuilders() as $boostFunctionBuilder ) { |
| 141 | if ( $boostFunctionBuilder instanceof ByKeywordTemplateBoostFunction ) { |
| 142 | $withDefaultBoosts = false; |
| 143 | break; |
| 144 | } |
| 145 | } |
| 146 | |
| 147 | return new BoostTemplatesFunctionScoreBuilder( $config, $this->context->getNamespaces(), |
| 148 | $this->context->getLimitSearchToLocalWiki(), $withDefaultBoosts, $weight ); |
| 149 | case 'namespaces': |
| 150 | return new NamespacesFunctionScoreBuilder( $config, $this->context->getNamespaces(), $weight ); |
| 151 | case 'language': |
| 152 | return new LangWeightFunctionScoreBuilder( $config, $weight ); |
| 153 | case 'custom_field': |
| 154 | return new CustomFieldFunctionScoreBuilder( $config, $weight, $func['params'] ); |
| 155 | case 'script': |
| 156 | return new ScriptScoreFunctionScoreBuilder( $config, $weight, $func['script'] ); |
| 157 | case 'logscale_boost': |
| 158 | return new LogScaleBoostFunctionScoreBuilder( $config, $weight, $func['params'] ); |
| 159 | case 'satu': |
| 160 | return new SatuFunctionScoreBuilder( $config, $weight, $func['params'] ); |
| 161 | case 'log_multi': |
| 162 | return new LogMultFunctionScoreBuilder( $config, $weight, $func['params'] ); |
| 163 | case 'geomean': |
| 164 | return new GeoMeanFunctionScoreBuilder( $config, $weight, $func['params'] ); |
| 165 | case 'term_boost': |
| 166 | return new TermBoostScoreBuilder( $config, $weight, $func['params'] ); |
| 167 | default: |
| 168 | $builder = null; |
| 169 | $this->cirrusSearchHookRunner->onCirrusSearchScoreBuilder( $func, $this->context, $builder ); |
| 170 | if ( !$builder ) { |
| 171 | throw new InvalidRescoreProfileException( "Unknown function score type {$func['type']}." ); |
| 172 | } |
| 173 | if ( !( $builder instanceof BoostFunctionBuilder ) ) { |
| 174 | throw new InvalidRescoreProfileException( "Invalid function score type {$func['type']}: expected " . |
| 175 | BoostFunctionBuilder::class . " but was " . get_class( $builder ) ); |
| 176 | } |
| 177 | return $builder; |
| 178 | } |
| 179 | } |
| 180 | } |