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| 1 | <?php |
| 2 | |
| 3 | namespace CirrusSearch; |
| 4 | |
| 5 | use Exception; |
| 6 | use LogicException; |
| 7 | use MediaWiki\Extension\Elastica\ElasticaConnection; |
| 8 | use MediaWiki\MediaWikiServices; |
| 9 | use Wikimedia\Assert\Assert; |
| 10 | |
| 11 | /** |
| 12 | * Forms and caches connection to Elasticsearch as well as client objects |
| 13 | * that contain connection information like \Elastica\Index and \Elastica\Type. |
| 14 | * |
| 15 | * This program is free software; you can redistribute it and/or modify |
| 16 | * it under the terms of the GNU General Public License as published by |
| 17 | * the Free Software Foundation; either version 2 of the License, or |
| 18 | * (at your option) any later version. |
| 19 | * |
| 20 | * This program is distributed in the hope that it will be useful, |
| 21 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 22 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 23 | * GNU General Public License for more details. |
| 24 | * |
| 25 | * You should have received a copy of the GNU General Public License along |
| 26 | * with this program; if not, write to the Free Software Foundation, Inc., |
| 27 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. |
| 28 | * http://www.gnu.org/copyleft/gpl.html |
| 29 | */ |
| 30 | class Connection extends ElasticaConnection { |
| 31 | |
| 32 | /** |
| 33 | * Suffix of the index that holds content articles. |
| 34 | */ |
| 35 | public const CONTENT_INDEX_SUFFIX = 'content'; |
| 36 | |
| 37 | /** |
| 38 | * Suffix of the index that holds non-content articles. |
| 39 | */ |
| 40 | public const GENERAL_INDEX_SUFFIX = 'general'; |
| 41 | |
| 42 | /** |
| 43 | * Suffix of the index that hosts content title suggestions |
| 44 | */ |
| 45 | public const TITLE_SUGGEST_INDEX_SUFFIX = 'titlesuggest'; |
| 46 | |
| 47 | /** |
| 48 | * Suffix of the index that hosts archive data |
| 49 | */ |
| 50 | public const ARCHIVE_INDEX_SUFFIX = 'archive'; |
| 51 | |
| 52 | /** |
| 53 | * Name of the page document type. |
| 54 | */ |
| 55 | public const PAGE_DOC_TYPE = 'page'; |
| 56 | |
| 57 | /** |
| 58 | * Name of the title suggest document type |
| 59 | */ |
| 60 | public const TITLE_SUGGEST_DOC_TYPE = 'titlesuggest'; |
| 61 | |
| 62 | /** |
| 63 | * Name of the archive document type |
| 64 | */ |
| 65 | public const ARCHIVE_DOC_TYPE = 'archive'; |
| 66 | |
| 67 | /** |
| 68 | * Map of index types (suffix names) indexed by mapping type. |
| 69 | */ |
| 70 | private const SUFFIX_MAPPING = [ |
| 71 | self::PAGE_DOC_TYPE => [ |
| 72 | self::CONTENT_INDEX_SUFFIX, |
| 73 | self::GENERAL_INDEX_SUFFIX, |
| 74 | ], |
| 75 | self::ARCHIVE_DOC_TYPE => [ |
| 76 | self::ARCHIVE_INDEX_SUFFIX |
| 77 | ], |
| 78 | ]; |
| 79 | |
| 80 | /** |
| 81 | * @var SearchConfig |
| 82 | */ |
| 83 | protected $config; |
| 84 | |
| 85 | /** |
| 86 | * @var string |
| 87 | */ |
| 88 | protected $cluster; |
| 89 | |
| 90 | /** |
| 91 | * @var ClusterSettings|null |
| 92 | */ |
| 93 | private $clusterSettings; |
| 94 | |
| 95 | /** |
| 96 | * @var Connection[][] |
| 97 | */ |
| 98 | private static $pool = []; |
| 99 | |
| 100 | /** |
| 101 | * @param SearchConfig $config |
| 102 | * @param string|null $cluster |
| 103 | * @return Connection |
| 104 | */ |
| 105 | public static function getPool( SearchConfig $config, $cluster = null ) { |
| 106 | $assignment = $config->getClusterAssignment(); |
| 107 | $cluster ??= $assignment->getSearchCluster(); |
| 108 | $wiki = $config->getWikiId(); |
| 109 | $clusterId = $assignment->uniqueId( $cluster ); |
| 110 | return self::$pool[$wiki][$clusterId] ?? new self( $config, $cluster ); |
| 111 | } |
| 112 | |
| 113 | /** |
| 114 | * Pool state must be cleared when forking. Also useful |
| 115 | * in tests. |
| 116 | */ |
| 117 | public static function clearPool() { |
| 118 | self::$pool = []; |
| 119 | } |
| 120 | |
| 121 | /** |
| 122 | * @param SearchConfig $config |
| 123 | * @param string|null $cluster Name of cluster to use, or |
| 124 | * null for the default cluster. |
| 125 | */ |
| 126 | public function __construct( SearchConfig $config, $cluster = null ) { |
| 127 | $this->config = $config; |
| 128 | $assignment = $config->getClusterAssignment(); |
| 129 | $this->cluster = $cluster ?? $assignment->getSearchCluster(); |
| 130 | $this->setConnectTimeout( $this->getSettings()->getConnectTimeout() ); |
| 131 | // overwrites previous connection if it exists, but these |
| 132 | // seemed more centralized than having the entry points |
| 133 | // all call a static method unnecessarily. |
| 134 | // TODO: Assumes all $config that return same wiki id have same config, but there |
| 135 | // are places that expect they can wrap config with new values and use them. |
| 136 | $clusterId = $assignment->uniqueId( $this->cluster ); |
| 137 | self::$pool[$config->getWikiId()][$clusterId] = $this; |
| 138 | } |
| 139 | |
| 140 | /** |
| 141 | * @return never |
| 142 | */ |
| 143 | public function __sleep() { |
| 144 | throw new \RuntimeException( 'Attempting to serialize ES connection' ); |
| 145 | } |
| 146 | |
| 147 | /** |
| 148 | * @return string |
| 149 | */ |
| 150 | public function getClusterName() { |
| 151 | return $this->cluster; |
| 152 | } |
| 153 | |
| 154 | /** |
| 155 | * @return ClusterSettings |
| 156 | */ |
| 157 | public function getSettings() { |
| 158 | if ( $this->clusterSettings === null ) { |
| 159 | $this->clusterSettings = new ClusterSettings( $this->config, $this->cluster ); |
| 160 | } |
| 161 | return $this->clusterSettings; |
| 162 | } |
| 163 | |
| 164 | /** |
| 165 | * @return string[]|array[] Either a list of hostnames, for default |
| 166 | * connection configuration or an array of arrays giving full connection |
| 167 | * specifications. |
| 168 | */ |
| 169 | public function getServerList() { |
| 170 | return $this->config->getClusterAssignment()->getServerList( $this->cluster ); |
| 171 | } |
| 172 | |
| 173 | /** |
| 174 | * How many times can we attempt to connect per host? |
| 175 | * |
| 176 | * @return int |
| 177 | */ |
| 178 | public function getMaxConnectionAttempts() { |
| 179 | return $this->config->get( 'CirrusSearchConnectionAttempts' ); |
| 180 | } |
| 181 | |
| 182 | /** |
| 183 | * Fetch the Elastica Index for archive. |
| 184 | * @param mixed $name basename of index |
| 185 | * @return \Elastica\Index |
| 186 | */ |
| 187 | public function getArchiveIndex( $name ) { |
| 188 | return $this->getIndex( $name, self::ARCHIVE_INDEX_SUFFIX ); |
| 189 | } |
| 190 | |
| 191 | /** |
| 192 | * Get all index types we support, content, general, plus custom ones |
| 193 | * |
| 194 | * @param string|null $documentType the document type name the index must support to be returned |
| 195 | * can be self::PAGE_DOC_TYPE for content and general indices but also self::ARCHIVE_DOC_TYPE |
| 196 | * for the archive index. Defaults to Connection::PAGE_DOC_TYPE. |
| 197 | * set to null to return all known index types (only suited for maintenance tasks, not for read/write operations). |
| 198 | * @return string[] |
| 199 | */ |
| 200 | public function getAllIndexSuffixes( $documentType = self::PAGE_DOC_TYPE ) { |
| 201 | Assert::parameter( $documentType === null || isset( self::SUFFIX_MAPPING[$documentType] ), |
| 202 | '$documentType', "Unknown mapping type $documentType" ); |
| 203 | $indexSuffixes = []; |
| 204 | |
| 205 | if ( $documentType === null ) { |
| 206 | foreach ( self::SUFFIX_MAPPING as $types ) { |
| 207 | $indexSuffixes = array_merge( $indexSuffixes, $types ); |
| 208 | } |
| 209 | $indexSuffixes = array_merge( |
| 210 | $indexSuffixes, |
| 211 | array_values( $this->config->get( 'CirrusSearchNamespaceMappings' ) ) |
| 212 | ); |
| 213 | } else { |
| 214 | $indexSuffixes = array_merge( |
| 215 | $indexSuffixes, |
| 216 | self::SUFFIX_MAPPING[$documentType], |
| 217 | $documentType === self::PAGE_DOC_TYPE ? |
| 218 | array_values( $this->config->get( 'CirrusSearchNamespaceMappings' ) ) : [] |
| 219 | ); |
| 220 | } |
| 221 | |
| 222 | if ( !$this->getSettings()->isPrivateCluster() |
| 223 | || !$this->config->get( 'CirrusSearchEnableArchive' ) |
| 224 | ) { |
| 225 | $indexSuffixes = array_filter( $indexSuffixes, static function ( $type ) { |
| 226 | return $type !== self::ARCHIVE_INDEX_SUFFIX; |
| 227 | } ); |
| 228 | } |
| 229 | |
| 230 | return $indexSuffixes; |
| 231 | } |
| 232 | |
| 233 | /** |
| 234 | * @param string $name |
| 235 | * @return string |
| 236 | * @throws Exception |
| 237 | */ |
| 238 | public function extractIndexSuffix( $name ) { |
| 239 | $matches = []; |
| 240 | $possible = implode( '|', array_map( 'preg_quote', $this->getAllIndexSuffixes( null ) ) ); |
| 241 | if ( !preg_match( "/_($possible)_[^_]+$/", $name, $matches ) ) { |
| 242 | throw new LogicException( "Can't parse index name: $name" ); |
| 243 | } |
| 244 | |
| 245 | return $matches[1]; |
| 246 | } |
| 247 | |
| 248 | /** |
| 249 | * Get the index suffix for a given namespace |
| 250 | * @param int $namespace A namespace id |
| 251 | * @return string |
| 252 | */ |
| 253 | public function getIndexSuffixForNamespace( $namespace ) { |
| 254 | $mappings = $this->config->get( 'CirrusSearchNamespaceMappings' ); |
| 255 | if ( isset( $mappings[$namespace] ) ) { |
| 256 | return $mappings[$namespace]; |
| 257 | } |
| 258 | $defaultSearch = $this->config->get( 'NamespacesToBeSearchedDefault' ); |
| 259 | if ( isset( $defaultSearch[$namespace] ) && $defaultSearch[$namespace] ) { |
| 260 | return self::CONTENT_INDEX_SUFFIX; |
| 261 | } |
| 262 | |
| 263 | return MediaWikiServices::getInstance()->getNamespaceInfo()->isContent( $namespace ) ? |
| 264 | self::CONTENT_INDEX_SUFFIX : self::GENERAL_INDEX_SUFFIX; |
| 265 | } |
| 266 | |
| 267 | /** |
| 268 | * @param int[]|null $namespaces List of namespaces to check |
| 269 | * @return string|false The suffix to use (e.g. content or general) to |
| 270 | * query the namespaces, or false if both need to be queried. |
| 271 | * @deprecated 1.38 Use self::pickIndexSuffixForNamespaces |
| 272 | */ |
| 273 | public function pickIndexTypeForNamespaces( ?array $namespaces = null ) { |
| 274 | return $this->pickIndexSuffixForNamespaces( $namespaces ); |
| 275 | } |
| 276 | |
| 277 | /** |
| 278 | * @param int[]|null $namespaces List of namespaces to check |
| 279 | * @return string|false The suffix to use (e.g. content or general) to |
| 280 | * query the namespaces, or false if all need to be queried. |
| 281 | */ |
| 282 | public function pickIndexSuffixForNamespaces( ?array $namespaces = null ) { |
| 283 | $indexSuffixes = []; |
| 284 | if ( $namespaces ) { |
| 285 | foreach ( $namespaces as $namespace ) { |
| 286 | $indexSuffixes[] = $this->getIndexSuffixForNamespace( $namespace ); |
| 287 | } |
| 288 | $indexSuffixes = array_unique( $indexSuffixes ); |
| 289 | } |
| 290 | if ( count( $indexSuffixes ) === 1 ) { |
| 291 | return $indexSuffixes[0]; |
| 292 | } else { |
| 293 | return false; |
| 294 | } |
| 295 | } |
| 296 | |
| 297 | /** |
| 298 | * @param int[]|null $namespaces List of namespaces to check |
| 299 | * @return string[] the list of all index suffixes mathing the namespaces |
| 300 | */ |
| 301 | public function getAllIndexSuffixesForNamespaces( $namespaces = null ) { |
| 302 | if ( $namespaces ) { |
| 303 | $indexSuffixes = []; |
| 304 | foreach ( $namespaces as $namespace ) { |
| 305 | $indexSuffixes[] = $this->getIndexSuffixForNamespace( $namespace ); |
| 306 | } |
| 307 | return array_unique( $indexSuffixes ); |
| 308 | } |
| 309 | // If no namespaces provided all indices are needed |
| 310 | $mappings = $this->config->get( 'CirrusSearchNamespaceMappings' ); |
| 311 | return array_merge( self::SUFFIX_MAPPING[self::PAGE_DOC_TYPE], |
| 312 | array_values( $mappings ) ); |
| 313 | } |
| 314 | |
| 315 | public function destroyClient() { |
| 316 | self::$pool = []; |
| 317 | parent::destroyClient(); |
| 318 | } |
| 319 | |
| 320 | /** |
| 321 | * @param string[] $clusters array of cluster names |
| 322 | * @param SearchConfig $config the search config |
| 323 | * @return Connection[] array of connection indexed by cluster name |
| 324 | */ |
| 325 | public static function getClusterConnections( array $clusters, SearchConfig $config ) { |
| 326 | $connections = []; |
| 327 | foreach ( $clusters as $name ) { |
| 328 | $connections[$name] = self::getPool( $config, $name ); |
| 329 | } |
| 330 | return $connections; |
| 331 | } |
| 332 | |
| 333 | /** |
| 334 | * @return SearchConfig |
| 335 | */ |
| 336 | public function getConfig() { |
| 337 | return $this->config; |
| 338 | } |
| 339 | } |