/**
* merge top level multi-queries and resolve returned pageIds into Title objects.
*
* WARNING: experimental API
*
* @param string $query the user query
* @param \Elastica\Response $response Response from elasticsearch _suggest api
* @param array $profiles the suggestion profiles
* @param int $limit Maximum suggestions to return, -1 for unlimited
* @return SearchSuggestionSet a set of Suggestions
*/
protected function postProcessSuggest(\Elastica\Response $response, $profiles, $limit = -1)
{
$this->logContext['elasticTookMs'] = intval($response->getQueryTime() * 1000);
$data = $response->getData();
unset($data['_shards']);
$suggestions = array();
foreach ($data as $name => $results) {
$discount = $profiles[$name]['discount'];
foreach ($results as $suggested) {
foreach ($suggested['options'] as $suggest) {
$output = SuggestBuilder::decodeOutput($suggest['text']);
if ($output === null) {
// Ignore broken output
continue;
}
$pageId = $output['id'];
$type = $output['type'];
$score = $discount * $suggest['score'];
if (!isset($suggestions[$pageId]) || $score > $suggestions[$pageId]->getScore()) {
$suggestion = new SearchSuggestion($score, null, null, $pageId);
// If it's a title suggestion we have the text
if ($type === SuggestBuilder::TITLE_SUGGESTION) {
$suggestion->setText($output['text']);
}
$suggestions[$pageId] = $suggestion;
}
}
}
}
// simply sort by existing scores
uasort($suggestions, function ($a, $b) {
return $b->getScore() - $a->getScore();
});
$this->logContext['hitsTotal'] = count($suggestions);
if ($limit > 0) {
$suggestions = array_slice($suggestions, 0, $limit, true);
}
$this->logContext['hitsReturned'] = count($suggestions);
$this->logContext['hitsOffset'] = 0;
// we must fetch redirect data for redirect suggestions
$missingText = array();
foreach ($suggestions as $id => $suggestion) {
if ($suggestion->getText() === null) {
$missingText[] = $id;
}
}
if (!empty($missingText)) {
// Experimental.
//
// Second pass query to fetch redirects.
// It's not clear if it's the best option, this will slowdown the whole query
// when we hit a redirect suggestion.
// Other option would be to encode redirects as a payload resulting in a
// very big index...
// XXX: we support only the content index
$type = $this->connection->getPageType($this->indexBaseName, Connection::CONTENT_INDEX_TYPE);
// NOTE: we are already in a poolCounterWork
// Multi get is not supported by elastica
$redirResponse = null;
try {
$redirResponse = $type->request('_mget', 'GET', array('ids' => $missingText), array('_source_include' => 'redirect'));
if ($redirResponse->isOk()) {
$this->logContext['elasticTook2PassMs'] = intval($redirResponse->getQueryTime() * 1000);
$docs = $redirResponse->getData();
foreach ($docs['docs'] as $doc) {
if (empty($doc['_source']['redirect'])) {
continue;
}
// We use the original query, we should maybe use the variant that generated this result?
$text = Util::chooseBestRedirect($this->term, $doc['_source']['redirect']);
if (!empty($suggestions[$doc['_id']])) {
$suggestions[$doc['_id']]->setText($text);
}
}
} else {
LoggerFactory::getInstance('CirrusSearch')->warning('Unable to fetch redirects for suggestion {query} with results {ids} : {error}', array('query' => $this->term, 'ids' => serialize($missingText), 'error' => $redirResponse->getError()));
}
} catch (\Elastica\Exception\ExceptionInterface $e) {
LoggerFactory::getInstance('CirrusSearch')->warning('Unable to fetch redirects for suggestion {query} with results {ids} : {error}', array('query' => $this->term, 'ids' => serialize($missingText), 'error' => $this->extractMessage($e)));
}
}
return new SearchSuggestionSet(array_filter($suggestions, function ($suggestion) {
// text should be not empty for suggestions
return $suggestion->getText() != null;
}));
}
/**
* This implementation will run the completion suggester if it's enabled and if the
* query is for NS_MAIN. Fallback to SearchEngine default implemention otherwise.
*
* @param string $search the user query
* @return SearchSuggestionSet the suggestions
*/
public function searchSuggestions($search)
{
$config = ConfigFactory::getDefaultInstance()->makeConfig('CirrusSearch');
$useCompletionSuggester = $config->getElement('CirrusSearchUseCompletionSuggester');
$context = RequestContext::getMain();
$request = $context->getRequest();
// Allow experimentation with query parameters
if ($request && $request->getVal('cirrusUseCompletionSuggester') === 'yes') {
$useCompletionSuggester = true;
}
if (!$useCompletionSuggester) {
// Completion suggester is not enabled, fallback to
// default implementation
return $this->searchSuggestionsPrefixSearchFallback($search);
}
// We use Title to extract namespace from a Title string
// We append a random letter behind just in case the search
// string ends with ':'.
$title = Title::newFromText($search . "A");
if ($title->getNamespace() != NS_MAIN || count($this->namespaces) != 1 || reset($this->namespaces) != NS_MAIN) {
// Fallback to prefix search if we are not on content namespace
return $this->searchSuggestionsPrefixSearchFallback($search);
}
$user = $context->getUser();
// offset is omitted, searchSuggestion does not support
// scrolling results
$suggester = new CompletionSuggester($this->connection, $this->limit, $config, $this->namespaces, $user, $this->indexBaseName);
// Not really useful, mostly for testing purpose
$variants = $request->getArray('cirrusCompletionSuggesterVariant');
if (empty($variants)) {
global $wgContLang;
$variants = $wgContLang->autoConvertToAllVariants($search);
} else {
if (count($variants) > 3) {
// We should not allow too many variants
$variants = array_slice($variants, 0, 3);
}
}
$response = $suggester->suggest($search, $variants);
if ($response->isOK()) {
// Errors will be logged, let's try the exact db match
$suggestions = $response->getValue();
} else {
$suggestions = SearchSuggestionSet::emptySuggestionSet();
}
// preload the titles with LinkBatch
$titles = $suggestions->map(function ($sugg) {
return $sugg->getSuggestedTitle();
});
$lb = new LinkBatch($titles);
$lb->setCaller(__METHOD__);
$lb->execute();
$results = $suggestions->map(function ($sugg) {
return $sugg->getSuggestedTitle()->getPrefixedText();
});
// now we can trim
$search = trim($search);
// Rescore results with an exact title match
$rescorer = new SearchExactMatchRescorer();
$rescoredResults = $rescorer->rescore($search, $this->namespaces, $results, $this->limit);
if (count($rescoredResults) > 0) {
$found = array_search($rescoredResults[0], $results);
if ($found === false) {
// If the first result is not in the previous array it
// means that we found a new exact match
$exactMatch = SearchSuggestion::fromTitle(0, Title::newFromText($rescoredResults[0]));
$suggestions->prepend($exactMatch);
$suggestions->shrink($this->limit);
} else {
// if the first result is not the same we need to rescore
if ($found > 0) {
$suggestions->rescore($found);
}
}
}
return $suggestions;
}
