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| 1 | <?php |
| 2 | |
| 3 | namespace Flow\Data\Index; |
| 4 | |
| 5 | use Flow\Data\Compactor; |
| 6 | use Flow\Data\Compactor\FeatureCompactor; |
| 7 | use Flow\Data\Compactor\ShallowCompactor; |
| 8 | use Flow\Data\FlowObjectCache; |
| 9 | use Flow\Data\Index; |
| 10 | use Flow\Data\ObjectManager; |
| 11 | use Flow\Data\ObjectMapper; |
| 12 | use Flow\Data\ObjectStorage; |
| 13 | use Flow\Exception\DataModelException; |
| 14 | use Flow\Model\UUID; |
| 15 | use MediaWiki\Json\FormatJson; |
| 16 | use MediaWiki\WikiMap\WikiMap; |
| 17 | |
| 18 | /** |
| 19 | * Index objects with equal features($indexedColumns) into the same buckets. |
| 20 | */ |
| 21 | abstract class FeatureIndex implements Index { |
| 22 | |
| 23 | /** |
| 24 | * @var FlowObjectCache |
| 25 | */ |
| 26 | protected $cache; |
| 27 | |
| 28 | /** |
| 29 | * @var ObjectStorage |
| 30 | */ |
| 31 | protected $storage; |
| 32 | |
| 33 | /** |
| 34 | * @var ObjectMapper |
| 35 | */ |
| 36 | protected $mapper; |
| 37 | |
| 38 | /** |
| 39 | * @var string |
| 40 | */ |
| 41 | protected $prefix; |
| 42 | |
| 43 | /** |
| 44 | * @var Compactor |
| 45 | */ |
| 46 | protected $rowCompactor; |
| 47 | |
| 48 | /** |
| 49 | * @var string[] |
| 50 | */ |
| 51 | protected $indexed; |
| 52 | |
| 53 | /** |
| 54 | * @var string[] The indexed columns in alphabetical order. This is |
| 55 | * ordered so that cache keys can be generated in a stable manner. |
| 56 | */ |
| 57 | protected $indexedOrdered; |
| 58 | |
| 59 | /** |
| 60 | * @var array |
| 61 | */ |
| 62 | protected $options; |
| 63 | |
| 64 | /** |
| 65 | * @inheritDoc |
| 66 | */ |
| 67 | abstract public function getLimit(); |
| 68 | |
| 69 | /** |
| 70 | * @return array The options used for querying self::$storage |
| 71 | */ |
| 72 | abstract public function queryOptions(); |
| 73 | |
| 74 | /** |
| 75 | * @todo Similar, Could the cache key be passed in instead of $indexed? |
| 76 | * @param array $indexed The portion of $row that makes up the cache key |
| 77 | * @param array $row A single row of data to remove from its related feature bucket |
| 78 | */ |
| 79 | abstract protected function removeFromIndex( array $indexed, array $row ); |
| 80 | |
| 81 | /** |
| 82 | * @param FlowObjectCache $cache |
| 83 | * @param ObjectStorage $storage |
| 84 | * @param ObjectMapper $mapper |
| 85 | * @param string $prefix Prefix to utilize for all cache keys |
| 86 | * @param string[] $indexedColumns List of columns to index |
| 87 | */ |
| 88 | public function __construct( FlowObjectCache $cache, ObjectStorage $storage, ObjectMapper $mapper, $prefix, array $indexedColumns ) { |
| 89 | $this->cache = $cache; |
| 90 | $this->storage = $storage; |
| 91 | $this->mapper = $mapper; |
| 92 | $this->prefix = $prefix; |
| 93 | $this->rowCompactor = new FeatureCompactor( $indexedColumns ); |
| 94 | $this->indexed = $indexedColumns; |
| 95 | // sort this and ksort in self::cacheKey to always have cache key |
| 96 | // fields in same order |
| 97 | sort( $indexedColumns ); |
| 98 | $this->indexedOrdered = $indexedColumns; |
| 99 | } |
| 100 | |
| 101 | /** |
| 102 | * @return string[] The list of columns to bucket database rows by in |
| 103 | * the same order as provided to the constructor. |
| 104 | */ |
| 105 | public function getPrimaryKeyColumns() { |
| 106 | return $this->indexed; |
| 107 | } |
| 108 | |
| 109 | /** |
| 110 | * @inheritDoc |
| 111 | */ |
| 112 | public function canAnswer( array $featureColumns, array $options ) { |
| 113 | sort( $featureColumns ); |
| 114 | if ( $featureColumns !== $this->indexedOrdered ) { |
| 115 | return false; |
| 116 | } |
| 117 | |
| 118 | // This can probably be moved to TopKIndex if it's not used |
| 119 | // by anything else. |
| 120 | if ( isset( $options['limit'] ) ) { |
| 121 | $max = $options['limit']; |
| 122 | if ( isset( $options['offset'] ) ) { |
| 123 | $max += $options['offset']; |
| 124 | } |
| 125 | if ( $max > $this->getLimit() ) { |
| 126 | return false; |
| 127 | } |
| 128 | } |
| 129 | return true; |
| 130 | } |
| 131 | |
| 132 | /** |
| 133 | * Rows are first sorted based on the first term of the result, then ties |
| 134 | * are broken by evaluating the second term and so on. |
| 135 | * |
| 136 | * @return string[]|false The columns to sort by, or false if no sorting is defined |
| 137 | */ |
| 138 | public function getSort() { |
| 139 | return $this->options['sort'] ?? false; |
| 140 | } |
| 141 | |
| 142 | /** |
| 143 | * @inheritDoc |
| 144 | */ |
| 145 | public function getOrder() { |
| 146 | if ( isset( $this->options['order'] ) && strtoupper( $this->options['order'] ) === 'ASC' ) { |
| 147 | return 'ASC'; |
| 148 | } else { |
| 149 | return 'DESC'; |
| 150 | } |
| 151 | } |
| 152 | |
| 153 | /** |
| 154 | * Delete any feature bucket $object would be contained in from the cache |
| 155 | * |
| 156 | * @param object $object |
| 157 | * @param array $row |
| 158 | * @throws DataModelException |
| 159 | */ |
| 160 | public function cachePurge( $object, array $row ) { |
| 161 | $indexed = ObjectManager::splitFromRow( $row, $this->indexed ); |
| 162 | if ( !$indexed ) { |
| 163 | throw new DataModelException( 'Un-indexable row: ' . FormatJson::encode( $row ), 'process-data' ); |
| 164 | } |
| 165 | // We don't want to just remove this object from the index, then the index would be incorrect. |
| 166 | // We want to delete the bucket that contains this object. |
| 167 | $this->cache->delete( $this->cacheKey( $indexed ) ); |
| 168 | } |
| 169 | |
| 170 | /** |
| 171 | * @inheritDoc |
| 172 | */ |
| 173 | public function onAfterInsert( $object, array $new, array $metadata ) { |
| 174 | $indexed = ObjectManager::splitFromRow( $new, $this->indexed ); |
| 175 | // is un-indexable a bail-worthy occasion? Probably not but makes debugging easier |
| 176 | if ( !$indexed ) { |
| 177 | throw new DataModelException( 'Un-indexable row: ' . FormatJson::encode( $new ), 'process-data' ); |
| 178 | } |
| 179 | $compacted = $this->rowCompactor->compactRow( UUID::convertUUIDs( $new, 'alphadecimal' ) ); |
| 180 | $this->removeFromIndex( $indexed, $compacted ); |
| 181 | } |
| 182 | |
| 183 | /** |
| 184 | * @inheritDoc |
| 185 | */ |
| 186 | public function onAfterUpdate( $object, array $old, array $new, array $metadata ) { |
| 187 | $oldIndexed = ObjectManager::splitFromRow( $old, $this->indexed ); |
| 188 | $newIndexed = ObjectManager::splitFromRow( $new, $this->indexed ); |
| 189 | if ( !$oldIndexed ) { |
| 190 | throw new DataModelException( 'Un-indexable row: ' . FormatJson::encode( $oldIndexed ), 'process-data' ); |
| 191 | } |
| 192 | if ( !$newIndexed ) { |
| 193 | throw new DataModelException( 'Un-indexable row: ' . FormatJson::encode( $newIndexed ), 'process-data' ); |
| 194 | } |
| 195 | $oldCompacted = $this->rowCompactor->compactRow( UUID::convertUUIDs( $old, 'alphadecimal' ) ); |
| 196 | $newCompacted = $this->rowCompactor->compactRow( UUID::convertUUIDs( $new, 'alphadecimal' ) ); |
| 197 | $oldIndexedForComparison = UUID::convertUUIDs( $oldIndexed, 'alphadecimal' ); |
| 198 | $newIndexedForComparison = UUID::convertUUIDs( $newIndexed, 'alphadecimal' ); |
| 199 | if ( ObjectManager::arrayEquals( $oldIndexedForComparison, $newIndexedForComparison ) ) { |
| 200 | if ( ObjectManager::arrayEquals( $oldCompacted, $newCompacted ) ) { |
| 201 | // Nothing changed in the index |
| 202 | return; |
| 203 | } |
| 204 | // object representation in feature bucket has changed |
| 205 | $this->removeFromIndex( $oldIndexed, $oldCompacted ); |
| 206 | } else { |
| 207 | // object has moved from one feature bucket to another |
| 208 | $this->removeFromIndex( $oldIndexed, $oldCompacted ); |
| 209 | } |
| 210 | } |
| 211 | |
| 212 | /** |
| 213 | * @inheritDoc |
| 214 | */ |
| 215 | public function onAfterRemove( $object, array $old, array $metadata ) { |
| 216 | $indexed = ObjectManager::splitFromRow( $old, $this->indexed ); |
| 217 | if ( !$indexed ) { |
| 218 | throw new DataModelException( 'Unindexable row: ' . FormatJson::encode( $old ), 'process-data' ); |
| 219 | } |
| 220 | $compacted = $this->rowCompactor->compactRow( UUID::convertUUIDs( $old, 'alphadecimal' ) ); |
| 221 | $this->removeFromIndex( $indexed, $compacted ); |
| 222 | } |
| 223 | |
| 224 | /** |
| 225 | * @inheritDoc |
| 226 | */ |
| 227 | public function onAfterLoad( $object, array $old ) { |
| 228 | // nothing to do |
| 229 | } |
| 230 | |
| 231 | /** |
| 232 | * @inheritDoc |
| 233 | */ |
| 234 | public function onAfterClear() { |
| 235 | // nothing to do |
| 236 | } |
| 237 | |
| 238 | /** |
| 239 | * @inheritDoc |
| 240 | */ |
| 241 | public function find( array $attributes, array $options = [] ) { |
| 242 | $results = $this->findMulti( [ $attributes ], $options ); |
| 243 | return reset( $results ); |
| 244 | } |
| 245 | |
| 246 | /** |
| 247 | * @inheritDoc |
| 248 | */ |
| 249 | public function findMulti( array $queries, array $options = [] ) { |
| 250 | if ( !$queries ) { |
| 251 | return []; |
| 252 | } |
| 253 | |
| 254 | // get cache keys for all queries |
| 255 | $cacheKeys = $this->getCacheKeys( $queries ); |
| 256 | |
| 257 | // retrieve from cache (only query duplicate queries once) |
| 258 | // $fromCache will be an array containing compacted results as value and |
| 259 | // cache keys as key |
| 260 | $fromCache = $this->cache->getMulti( array_unique( $cacheKeys ) ); |
| 261 | |
| 262 | // figure out what queries were resolved in cache |
| 263 | // $keysFromCache will be an array where values are cache keys and keys |
| 264 | // are the same index as their corresponding $queries |
| 265 | // (intersect with $cacheKeys to guarantee order) |
| 266 | $keysFromCache = array_intersect( $cacheKeys, array_keys( $fromCache ) ); |
| 267 | |
| 268 | // filter out all queries that have been resolved from cache and fetch |
| 269 | // them from storage |
| 270 | // $fromStorage will be an array containing (expanded) results as value |
| 271 | // and indexes matching $query as key |
| 272 | $storageQueries = array_diff_key( $queries, $keysFromCache ); |
| 273 | $fromStorage = []; |
| 274 | if ( $storageQueries ) { |
| 275 | $fromStorage = $this->backingStoreFindMulti( $storageQueries ); |
| 276 | foreach ( $fromStorage as $idx => $resultFromStorage ) { |
| 277 | $key = $this->cacheKey( $storageQueries[$idx] ); |
| 278 | $this->cache->set( $key, $resultFromStorage ); |
| 279 | } |
| 280 | } |
| 281 | |
| 282 | $results = $fromStorage; |
| 283 | |
| 284 | // $queries may have had duplicates that we've ignored to minimize |
| 285 | // cache requests - now re-duplicate values from cache & match the |
| 286 | // results against their respective original keys in $queries |
| 287 | foreach ( $keysFromCache as $index => $cacheKey ) { |
| 288 | $results[$index] = $fromCache[$cacheKey]; |
| 289 | } |
| 290 | |
| 291 | // now that we have all data, both from cache & backing storage, filter |
| 292 | // out all data we don't need |
| 293 | $results = $this->filterResults( $results, $options ); |
| 294 | |
| 295 | // if we have no data from cache, there's nothing left - quit early |
| 296 | if ( !$fromCache ) { |
| 297 | return $results; |
| 298 | } |
| 299 | |
| 300 | // because we may have combined data from 2 different sources, chances |
| 301 | // are the order of the data is no longer in sync with the order |
| 302 | // $queries were in - fix that by replacing $queries values with |
| 303 | // the corresponding $results value |
| 304 | // note that there may be missing results, hence the intersect ;) |
| 305 | $order = array_intersect_key( $queries, $results ); |
| 306 | $results = array_replace( $order, $results ); |
| 307 | |
| 308 | $keyToQuery = []; |
| 309 | foreach ( $keysFromCache as $index => $key ) { |
| 310 | // all redundant data has been stripped, now expand all cache values |
| 311 | // (we're only doing this now to avoid expanding redundant data) |
| 312 | $fromCache[$key] = $results[$index]; |
| 313 | |
| 314 | // to expand rows, we'll need the $query info mapped to the cache |
| 315 | // key instead of the $query index |
| 316 | if ( !isset( $keyToQuery[$key] ) ) { |
| 317 | $keyToQuery[$key] = $queries[$index]; |
| 318 | $keyToQuery[$key] = UUID::convertUUIDs( $keyToQuery[$key], 'alphadecimal' ); |
| 319 | } |
| 320 | } |
| 321 | |
| 322 | // expand and replace the stubs in $results with complete data |
| 323 | $fromCache = $this->rowCompactor->expandCacheResult( $fromCache, $keyToQuery ); |
| 324 | foreach ( $keysFromCache as $index => $cacheKey ) { |
| 325 | $results[$index] = $fromCache[$cacheKey]; |
| 326 | } |
| 327 | |
| 328 | return $results; |
| 329 | } |
| 330 | |
| 331 | /** |
| 332 | * Get rid of unneeded, according to the given $options. |
| 333 | * |
| 334 | * This is used to strip entries before expanding them; |
| 335 | * basically, at that point, we may only have a list of ids, which we need |
| 336 | * to expand (= fetch from cache) - don't want to do this for more than |
| 337 | * what is needed |
| 338 | * |
| 339 | * @param array[] $results |
| 340 | * @param array $options |
| 341 | * @return array[] |
| 342 | */ |
| 343 | protected function filterResults( array $results, array $options = [] ) { |
| 344 | // Overriden in TopKIndex |
| 345 | return $results; |
| 346 | } |
| 347 | |
| 348 | /** |
| 349 | * Returns a boolean true/false if the find()-operation for the given |
| 350 | * attributes has already been resolves and doesn't need to query any |
| 351 | * outside cache/database. |
| 352 | * Determining if a find() has not yet been resolved may be useful so that |
| 353 | * additional data may be loaded at once. |
| 354 | * |
| 355 | * @param array $attributes Attributes to find() |
| 356 | * @param array $options Options to find() |
| 357 | * @return bool |
| 358 | */ |
| 359 | public function found( array $attributes, array $options = [] ) { |
| 360 | return $this->foundMulti( [ $attributes ], $options ); |
| 361 | } |
| 362 | |
| 363 | /** |
| 364 | * Returns a boolean true/false if the findMulti()-operation for the given |
| 365 | * attributes has already been resolves and doesn't need to query any |
| 366 | * outside cache/database. |
| 367 | * Determining if a find() has not yet been resolved may be useful so that |
| 368 | * additional data may be loaded at once. |
| 369 | * |
| 370 | * @param array $queries Queries to findMulti() |
| 371 | * @param array $options Options to findMulti() |
| 372 | * @return bool |
| 373 | */ |
| 374 | public function foundMulti( array $queries, array $options = [] ) { |
| 375 | if ( !$queries ) { |
| 376 | return true; |
| 377 | } |
| 378 | |
| 379 | // get cache keys for all queries |
| 380 | $cacheKeys = $this->getCacheKeys( $queries ); |
| 381 | |
| 382 | // check if cache has a way of identifying what's stored locally |
| 383 | if ( !method_exists( $this->cache, 'has' ) ) { |
| 384 | return false; |
| 385 | } |
| 386 | |
| 387 | // check if keys matching given queries are already known in local cache |
| 388 | foreach ( $cacheKeys as $key ) { |
| 389 | // @phan-suppress-next-line PhanUndeclaredMethod Checked with method_exists above |
| 390 | if ( !$this->cache->has( $key ) ) { |
| 391 | return false; |
| 392 | } |
| 393 | } |
| 394 | |
| 395 | $keyToQuery = []; |
| 396 | foreach ( $cacheKeys as $i => $key ) { |
| 397 | // These results will be merged into the query results, and as such need binary |
| 398 | // uuid's as would be received from storage |
| 399 | if ( !isset( $keyToQuery[$key] ) ) { |
| 400 | $keyToQuery[$key] = $queries[$i]; |
| 401 | } |
| 402 | } |
| 403 | |
| 404 | // retrieve from cache - this is cheap, it's is local storage |
| 405 | $cached = $this->cache->getMulti( $cacheKeys ); |
| 406 | foreach ( $cached as $i => $result ) { |
| 407 | $limit = $options['limit'] ?? $this->getLimit(); |
| 408 | $cached[$i] = array_splice( $result, 0, $limit ); |
| 409 | } |
| 410 | |
| 411 | // if we have a shallow compactor, the returned data are PKs of objects |
| 412 | // that need to be fetched too |
| 413 | if ( $this->rowCompactor instanceof ShallowCompactor ) { |
| 414 | // test of the keys to be expanded are already in local cache |
| 415 | $duplicator = $this->rowCompactor->getResultDuplicator( $cached, $keyToQuery ); |
| 416 | $queries = $duplicator->getUniqueQueries(); |
| 417 | if ( !$this->rowCompactor->getShallow()->foundMulti( $queries ) ) { |
| 418 | return false; |
| 419 | } |
| 420 | } |
| 421 | |
| 422 | return true; |
| 423 | } |
| 424 | |
| 425 | /** |
| 426 | * Build a map from cache key to its index in $queries. |
| 427 | * |
| 428 | * @param array $queries |
| 429 | * @return array Array of [query index => cache key] |
| 430 | * @throws DataModelException |
| 431 | */ |
| 432 | protected function getCacheKeys( $queries ) { |
| 433 | $idxToKey = []; |
| 434 | foreach ( $queries as $idx => $query ) { |
| 435 | ksort( $query ); |
| 436 | if ( array_keys( $query ) !== $this->indexedOrdered ) { |
| 437 | throw new DataModelException( |
| 438 | 'Cannot answer query for columns: ' . implode( ', ', array_keys( $queries[$idx] ) ), 'process-data' |
| 439 | ); |
| 440 | } |
| 441 | $key = $this->cacheKey( $query ); |
| 442 | $idxToKey[$idx] = $key; |
| 443 | } |
| 444 | |
| 445 | return $idxToKey; |
| 446 | } |
| 447 | |
| 448 | /** |
| 449 | * Query persistent storage for data not found in cache. Note that this |
| 450 | * does not use the query options because an individual bucket contents is |
| 451 | * based on constructor options, and not query options. Query options merely |
| 452 | * change what part of the bucket is returned(or if the query has to fail over |
| 453 | * to direct from storage due to being beyond the set of cached values). |
| 454 | * |
| 455 | * @param array $queries |
| 456 | * @return array |
| 457 | */ |
| 458 | protected function backingStoreFindMulti( array $queries ) { |
| 459 | // query backing store |
| 460 | $options = $this->queryOptions(); |
| 461 | $stored = $this->storage->findMulti( $queries, $options ); |
| 462 | $results = []; |
| 463 | |
| 464 | // map store results to cache key |
| 465 | foreach ( $stored as $idx => $rows ) { |
| 466 | if ( !$rows ) { |
| 467 | // Nothing found, should we cache failures as well as success? |
| 468 | continue; |
| 469 | } |
| 470 | $results[$idx] = $rows; |
| 471 | unset( $queries[$idx] ); |
| 472 | } |
| 473 | |
| 474 | if ( count( $queries ) !== 0 ) { |
| 475 | // Log something about not finding everything? |
| 476 | } |
| 477 | |
| 478 | return $results; |
| 479 | } |
| 480 | |
| 481 | /** |
| 482 | * Generate the cache key representing the attributes |
| 483 | * @param array $attributes |
| 484 | * @return string |
| 485 | */ |
| 486 | protected function cacheKey( array $attributes ) { |
| 487 | global $wgFlowCacheVersion; |
| 488 | foreach ( $attributes as $key => $attr ) { |
| 489 | if ( $attr instanceof UUID ) { |
| 490 | $attributes[$key] = $attr->getAlphadecimal(); |
| 491 | } elseif ( strlen( $attr ) === UUID::BIN_LEN && substr( $key, -3 ) === '_id' ) { |
| 492 | $attributes[$key] = UUID::create( $attr )->getAlphadecimal(); |
| 493 | } |
| 494 | } |
| 495 | |
| 496 | // values in $attributes may not always be in the exact same order, |
| 497 | // which would lead to differences in cache key if we don't force that |
| 498 | ksort( $attributes ); |
| 499 | |
| 500 | return $this->cache->makeGlobalKey( |
| 501 | $this->prefix, |
| 502 | self::cachedDbId(), |
| 503 | md5( implode( ':', $attributes ) ), |
| 504 | $wgFlowCacheVersion |
| 505 | ); |
| 506 | } |
| 507 | |
| 508 | /** |
| 509 | * @return string The id of the database being cached |
| 510 | */ |
| 511 | public static function cachedDbId() { |
| 512 | global $wgFlowDefaultWikiDb; |
| 513 | if ( $wgFlowDefaultWikiDb === false ) { |
| 514 | return WikiMap::getCurrentWikiDbDomain()->getId(); |
| 515 | } else { |
| 516 | return $wgFlowDefaultWikiDb; |
| 517 | } |
| 518 | } |
| 519 | } |