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| 1 | <?php |
| 2 | |
| 3 | namespace CirrusSearch; |
| 4 | |
| 5 | use MediaWiki\Interwiki\InterwikiLookup; |
| 6 | use MediaWiki\Logger\LoggerFactory; |
| 7 | use Wikimedia\Http\MultiHttpClient; |
| 8 | use Wikimedia\ObjectCache\WANObjectCache; |
| 9 | |
| 10 | /** |
| 11 | * Base InterwikiResolver class. |
| 12 | * Subclasses just need to provide the full matrix array |
| 13 | * by implementing loadMatrix(), the resulting matrix will |
| 14 | * be stored by this base class. |
| 15 | */ |
| 16 | abstract class BaseInterwikiResolver implements InterwikiResolver { |
| 17 | private const CONFIG_CACHE_TTL = 600; |
| 18 | |
| 19 | /** @var array[]|null full IW matrix (@see loadMatrix()) */ |
| 20 | private ?array $matrix = null; |
| 21 | |
| 22 | /** @var SearchConfig main wiki config */ |
| 23 | protected SearchConfig $config; |
| 24 | |
| 25 | /** @var bool use cirrus config dump API */ |
| 26 | private $useConfigDumpApi; |
| 27 | |
| 28 | /** |
| 29 | * @var MultiHttpClient http client to fetch config of other wikis |
| 30 | */ |
| 31 | private MultiHttpClient $httpClient; |
| 32 | |
| 33 | protected InterwikiLookup $interwikiLookup; |
| 34 | |
| 35 | protected WANObjectCache $wanCache; |
| 36 | |
| 37 | /** |
| 38 | * @param SearchConfig $config |
| 39 | * @param MultiHttpClient $client http client to fetch cirrus config |
| 40 | * @param WANObjectCache $wanCache Cache object for caching repeated requests |
| 41 | * @param InterwikiLookup $iwLookup |
| 42 | */ |
| 43 | public function __construct( |
| 44 | SearchConfig $config, |
| 45 | MultiHttpClient $client, |
| 46 | WANObjectCache $wanCache, |
| 47 | InterwikiLookup $iwLookup |
| 48 | ) { |
| 49 | $this->config = $config; |
| 50 | $this->useConfigDumpApi = $this->config->get( 'CirrusSearchFetchConfigFromApi' ); |
| 51 | $this->httpClient = $client; |
| 52 | $this->interwikiLookup = $iwLookup; |
| 53 | $this->wanCache = $wanCache; |
| 54 | } |
| 55 | |
| 56 | /** |
| 57 | * @return string[] |
| 58 | */ |
| 59 | public function getSisterProjectPrefixes() { |
| 60 | $matrix = $this->getMatrix(); |
| 61 | return $matrix['sister_projects'] ?? []; |
| 62 | } |
| 63 | |
| 64 | /** |
| 65 | * @return SearchConfig[] configs of sister project indexed by interwiki prefix |
| 66 | */ |
| 67 | public function getSisterProjectConfigs() { |
| 68 | $prefixes = $this->getSisterProjectPrefixes(); |
| 69 | return $this->loadConfigFromAPI( $prefixes, [], [ $this, 'minimalSearchConfig' ] ); |
| 70 | } |
| 71 | |
| 72 | /** |
| 73 | * @param string $wikiId |
| 74 | * @return string|null |
| 75 | */ |
| 76 | public function getInterwikiPrefix( $wikiId ) { |
| 77 | $matrix = $this->getMatrix(); |
| 78 | return $matrix['prefixes_by_wiki'][$wikiId] ?? null; |
| 79 | } |
| 80 | |
| 81 | /** |
| 82 | * @param string $lang |
| 83 | * @return string[] a two elements array [ 'prefix', 'language' ] |
| 84 | */ |
| 85 | public function getSameProjectWikiByLang( $lang ) { |
| 86 | $matrix = $this->getMatrix(); |
| 87 | // Most of the time the language is equal to the interwiki prefix. |
| 88 | // But it's not always the case, use the language_map to identify the interwiki prefix first. |
| 89 | $lang = $matrix['language_map'][$lang] ?? $lang; |
| 90 | return isset( $matrix['cross_language'][$lang] ) ? [ $matrix['cross_language'][$lang], $lang ] : []; |
| 91 | } |
| 92 | |
| 93 | /** |
| 94 | * @param string $lang |
| 95 | * @return SearchConfig[] single element array: [ interwiki => SearchConfig ] |
| 96 | */ |
| 97 | public function getSameProjectConfigByLang( $lang ) { |
| 98 | $wikiAndPrefix = $this->getSameProjectWikiByLang( $lang ); |
| 99 | if ( !$wikiAndPrefix ) { |
| 100 | return []; |
| 101 | } |
| 102 | [ $wiki, $prefix ] = $wikiAndPrefix; |
| 103 | return $this->loadConfigFromAPI( |
| 104 | [ $prefix => $wiki ], |
| 105 | [], |
| 106 | [ $this, 'minimalSearchConfig' ] ); |
| 107 | } |
| 108 | |
| 109 | /** @return array[] */ |
| 110 | private function getMatrix() { |
| 111 | if ( $this->matrix === null ) { |
| 112 | $this->matrix = $this->loadMatrix(); |
| 113 | |
| 114 | } |
| 115 | return $this->matrix; |
| 116 | } |
| 117 | |
| 118 | /** |
| 119 | * Load the interwiki matric information |
| 120 | * The returned array must include the following keys: |
| 121 | * - sister_projects: an array with the list of sister wikis indexed by |
| 122 | * interwiki prefix |
| 123 | * - cross_language: an array with the list of wikis running the same |
| 124 | * project/site indexed by interwiki prefix |
| 125 | * - language_map: an array with the list of interwiki prefixes where |
| 126 | * where the language code of the wiki does not match the prefix |
| 127 | * - prefixes_by_wiki: an array with the list of interwiki indexed |
| 128 | * by wikiID |
| 129 | * |
| 130 | * The result of this method is stored in the current InterwikiResolver instance |
| 131 | * so it can be called only once per request. |
| 132 | * |
| 133 | * return array[] |
| 134 | */ |
| 135 | abstract protected function loadMatrix(); |
| 136 | |
| 137 | /** |
| 138 | * @param string[] $wikis |
| 139 | * @param string[] $hashConfigFlags constructor flags for SearchConfig |
| 140 | * @param callable $fallbackConfig function to load the config if the |
| 141 | * api is not usable or if a failure occurs |
| 142 | * @return SearchConfig[] config indexed by iw prefix |
| 143 | */ |
| 144 | private function loadConfigFromAPI( $wikis, array $hashConfigFlags, $fallbackConfig ) { |
| 145 | $endpoints = []; |
| 146 | foreach ( $wikis as $prefix => $wiki ) { |
| 147 | $iw = $this->interwikiLookup->fetch( $prefix ); |
| 148 | if ( !$iw || !$this->useConfigDumpApi || !$iw->isLocal() ) { |
| 149 | continue; |
| 150 | } |
| 151 | $api = $iw->getAPI(); |
| 152 | if ( !$api ) { |
| 153 | $parts = parse_url( $iw->getURL() ); |
| 154 | if ( !isset( $parts['host'] ) ) { |
| 155 | continue; |
| 156 | } |
| 157 | $api = $parts['scheme'] ?? 'http'; |
| 158 | $api .= '://' . $parts['host']; |
| 159 | $api .= isset( $parts['port'] ) ? ':' . $parts['port'] : ''; |
| 160 | $api .= '/w/api.php'; |
| 161 | } |
| 162 | $endpoints[$prefix] = [ 'url' => $api, 'wiki' => $wiki ]; |
| 163 | } |
| 164 | |
| 165 | if ( $endpoints ) { |
| 166 | $prefixes = array_keys( $endpoints ); |
| 167 | asort( $prefixes ); |
| 168 | $cacheKey = implode( '-', $prefixes ); |
| 169 | $configs = $this->wanCache->getWithSetCallback( |
| 170 | $this->wanCache->makeKey( 'cirrussearch-load-iw-config', $cacheKey ), |
| 171 | self::CONFIG_CACHE_TTL, |
| 172 | function () use ( $endpoints ) { |
| 173 | return $this->sendConfigDumpRequest( $endpoints ); |
| 174 | } |
| 175 | ); |
| 176 | } else { |
| 177 | $configs = []; |
| 178 | } |
| 179 | $retValue = []; |
| 180 | foreach ( $wikis as $prefix => $wiki ) { |
| 181 | if ( isset( $configs[$prefix] ) ) { |
| 182 | $config = $configs[$prefix]; |
| 183 | $config['_wikiID'] = $wiki; |
| 184 | |
| 185 | $retValue[$prefix] = new HashSearchConfig( |
| 186 | $config, |
| 187 | array_merge( $hashConfigFlags, [ HashSearchConfig::FLAG_INHERIT ] ) |
| 188 | ); |
| 189 | } else { |
| 190 | $retValue[$prefix] = $fallbackConfig( $wiki, $hashConfigFlags ); |
| 191 | } |
| 192 | } |
| 193 | return $retValue; |
| 194 | } |
| 195 | |
| 196 | /** |
| 197 | * @param array[] $endpoints list of arrays containing 'url' and 'wiki', indexed by iw prefix |
| 198 | * @return array[] list of array containing extracted config vars, failed wikis |
| 199 | * are not returned. |
| 200 | */ |
| 201 | private function sendConfigDumpRequest( $endpoints ) { |
| 202 | $logger = LoggerFactory::getInstance( 'CirrusSearch' ); |
| 203 | $reqs = []; |
| 204 | foreach ( $endpoints as $prefix => $info ) { |
| 205 | $reqs[$prefix] = [ |
| 206 | 'method' => 'GET', |
| 207 | 'url' => $info['url'], |
| 208 | 'query' => [ |
| 209 | 'action' => 'cirrus-config-dump', |
| 210 | 'format' => 'json', |
| 211 | 'formatversion' => '2', |
| 212 | ] |
| 213 | ]; |
| 214 | } |
| 215 | if ( !$reqs ) { |
| 216 | return []; |
| 217 | } |
| 218 | $responses = $this->httpClient->runMulti( $reqs ); |
| 219 | $configs = []; |
| 220 | foreach ( $responses as $prefix => $response ) { |
| 221 | if ( $response['response']['code'] !== 200 ) { |
| 222 | $logger->warning( |
| 223 | 'Failed to fetch config for {wiki} at {url}: ' . |
| 224 | 'http status {httpstatus} : {clienterror}', |
| 225 | [ |
| 226 | 'wiki' => $endpoints[$prefix]['wiki'], |
| 227 | 'url' => $endpoints[$prefix]['url'], |
| 228 | 'httpstatus' => $response['response']['code'], |
| 229 | 'clienterror' => $response['response']['error'] |
| 230 | ] |
| 231 | ); |
| 232 | continue; |
| 233 | } |
| 234 | |
| 235 | $data = json_decode( $response['response']['body'], true ); |
| 236 | if ( json_last_error() !== JSON_ERROR_NONE ) { |
| 237 | $logger->warning( |
| 238 | 'Failed to fetch config for {wiki} at {url}: ' . |
| 239 | 'json error code {jsonerrorcode}', |
| 240 | [ |
| 241 | 'wiki' => $endpoints[$prefix]['wiki'], |
| 242 | 'url' => $endpoints[$prefix]['url'], |
| 243 | 'jsonerrorcode' => json_last_error() |
| 244 | ] |
| 245 | ); |
| 246 | continue; |
| 247 | } |
| 248 | |
| 249 | if ( isset( $data['error'] ) ) { |
| 250 | $logger->warning( |
| 251 | 'Failed to fetch config for {wiki} at {url}: {apierrormessage}', |
| 252 | [ |
| 253 | 'wiki' => $endpoints[$prefix]['wiki'], |
| 254 | 'url' => $endpoints[$prefix]['url'], |
| 255 | 'apierrormessage' => $data['error'] |
| 256 | ] |
| 257 | ); |
| 258 | continue; |
| 259 | } |
| 260 | unset( $data['warnings'] ); |
| 261 | $configs[$prefix] = $data; |
| 262 | } |
| 263 | return $configs; |
| 264 | } |
| 265 | |
| 266 | /** |
| 267 | * Minimal config needed to run a search on a target wiki |
| 268 | * living on the same cluster as the host wiki |
| 269 | * |
| 270 | * @param string $wiki |
| 271 | * @param string[] $hashConfigFlags constructor flags for HashSearchConfig |
| 272 | * @return SearchConfig |
| 273 | */ |
| 274 | protected function minimalSearchConfig( $wiki, array $hashConfigFlags ) { |
| 275 | return new HashSearchConfig( |
| 276 | [ |
| 277 | '_wikiID' => $wiki, |
| 278 | 'CirrusSearchIndexBaseName' => $wiki, |
| 279 | ], |
| 280 | array_merge( [ HashSearchConfig::FLAG_INHERIT ], $hashConfigFlags ) |
| 281 | ); |
| 282 | } |
| 283 | } |