| 1 |
<?php |
| 2 |
|
| 3 |
if (!defined('ABSPATH')) { |
| 4 |
exit; |
| 5 |
} |
| 6 |
|
| 7 |
/** |
| 8 |
* Repository for the abj404_ngram_cache table. |
| 9 |
* |
| 10 |
* Owns reads (per-page lookup, full-table load with guard, two-range filtered |
| 11 |
* load, count, stats) and writes (REPLACE on store, DELETE on invalidate) |
| 12 |
* for stored N-gram entries. After every write, calls the coverage policy |
| 13 |
* (lazily resolved to avoid construction-time circular dependency, since |
| 14 |
* the policy can also call back into repository-shaped helpers) so the |
| 15 |
* coverage transient is invalidated in one place. |
| 16 |
* |
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* The two-range query strategy in getCachedNGramsFiltered() avoids filesort |
| 18 |
* from ORDER BY ABS() by splitting into ASC and DESC halves and merging via |
| 19 |
* the proximity-merge primitive. |
| 20 |
*/ |
| 21 |
class ABJ_404_Solution_NGramCacheRepository { |
| 22 |
|
| 23 |
/** Maximum entries to load from N-gram cache to prevent memory exhaustion. |
| 24 |
* JSON decode of N-gram data is memory-intensive; 1000 entries is safe for 128MB limit. */ |
| 25 |
const CACHE_LOAD_LIMIT = 1000; |
| 26 |
|
| 27 |
/** @var ABJ_404_Solution_DatabaseCore */ |
| 28 |
private $dbCore; |
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|
| 30 |
/** @var ABJ_404_Solution_Logging */ |
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private $logger; |
| 32 |
|
| 33 |
/** @var ABJ_404_Solution_NGramSimilarity */ |
| 34 |
private $similarity; |
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|
| 36 |
/** @var callable|null Lazily resolves the NGramCoveragePolicy for write-path invalidation. */ |
| 37 |
private $coveragePolicyResolver; |
| 38 |
|
| 39 |
/** @var int|null Per-request memoized cache count */ |
| 40 |
private $cacheCountMemo = null; |
| 41 |
|
| 42 |
/** |
| 43 |
* @param ABJ_404_Solution_DatabaseCore|null $dbCore |
| 44 |
* @param ABJ_404_Solution_Logging|null $logging |
| 45 |
* @param ABJ_404_Solution_NGramSimilarity|null $similarity |
| 46 |
* @param callable|null $coveragePolicyResolver Called on write to fetch the coverage policy. Lazy to break ctor cycle. |
| 47 |
*/ |
| 48 |
public function __construct($dbCore = null, $logging = null, $similarity = null, $coveragePolicyResolver = null) { |
| 49 |
$this->dbCore = $dbCore !== null ? $dbCore : abj_service('db_core'); |
| 50 |
$this->logger = $logging !== null ? $logging : abj_service('logging'); |
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$this->similarity = $similarity instanceof ABJ_404_Solution_NGramSimilarity |
| 52 |
? $similarity |
| 53 |
: new ABJ_404_Solution_NGramSimilarity(); |
| 54 |
$this->coveragePolicyResolver = $coveragePolicyResolver; |
| 55 |
} |
| 56 |
|
| 57 |
/** |
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* Store N-grams for a page. |
| 59 |
* |
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* @param int $pageId |
| 61 |
* @param string $url |
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* @param string $urlNormalized |
| 63 |
* @param array<string, mixed> $ngrams |
| 64 |
* @param string $type Entity type: 'post', 'page', 'category', 'tag' |
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* @param bool $skipInvalidation Skip coverage invalidation (for bulk operations) |
| 66 |
* @return bool |
| 67 |
*/ |
| 68 |
public function storeNGrams($pageId, $url, $urlNormalized, $ngrams, $type = 'post', $skipInvalidation = false) { |
| 69 |
if (!is_numeric($pageId) || $pageId <= 0) { |
| 70 |
$this->logger->errorMessage("Invalid page ID for N-gram storage: " . var_export($pageId, true)); |
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return false; |
| 72 |
} |
| 73 |
|
| 74 |
if (!is_array($ngrams) || !isset($ngrams['bi']) || !isset($ngrams['tri'])) { |
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$this->logger->errorMessage("Invalid N-gram structure for page ID {$pageId}"); |
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return false; |
| 77 |
} |
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|
| 79 |
if (!is_array($ngrams['bi']) || !is_array($ngrams['tri'])) { |
| 80 |
$this->logger->errorMessage("Invalid N-gram array types for page ID {$pageId}"); |
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return false; |
| 82 |
} |
| 83 |
|
| 84 |
$ngramJson = json_encode($ngrams); |
| 85 |
if ($ngramJson === false) { |
| 86 |
$this->logger->errorMessage("Failed to JSON encode N-grams for page ID {$pageId}"); |
| 87 |
return false; |
| 88 |
} |
| 89 |
|
| 90 |
$ngramCount = count($ngrams['bi']) + count($ngrams['tri']); |
| 91 |
$table = $this->dbCore->tableNameResolver()->getPrefixedTableName('abj404_ngram_cache'); |
| 92 |
|
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// REPLACE = DELETE + INSERT. Routed through DAO for timeout/retry/recovery. |
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$queryResult = $this->dbCore->queryAndGetResults( |
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"REPLACE INTO {$table} (id, type, url, url_normalized, ngrams, ngram_count, last_updated) |
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VALUES (%d, %s, %s, %s, %s, %d, %d)", |
| 97 |
['query_params' => [ |
| 98 |
(int)$pageId, |
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$type, |
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$url, |
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$urlNormalized, |
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$ngramJson, |
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$ngramCount, |
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abj_clock()->wpNow(), |
| 105 |
]] |
| 106 |
); |
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|
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$lastError = isset($queryResult['last_error']) && is_string($queryResult['last_error']) ? $queryResult['last_error'] : ''; |
| 109 |
if ($lastError !== '') { |
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global $wpdb; |
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$dbName = isset($wpdb->dbname) && is_string($wpdb->dbname) ? $wpdb->dbname : ''; |
| 112 |
$errorContext = sprintf( |
| 113 |
"Failed to store N-grams for page ID %d: %s, Table: %s, Prefix: %s, DB: %s", |
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$pageId, |
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$lastError, |
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$table, |
| 117 |
$this->dbCore->tableNameResolver()->getLowercasePrefix(), |
| 118 |
$dbName |
| 119 |
); |
| 120 |
|
| 121 |
if (is_multisite()) { |
| 122 |
$errorContext .= sprintf(", Blog ID: %d", get_current_blog_id()); |
| 123 |
} |
| 124 |
|
| 125 |
if (!$this->dbCore->errorClassifier()->classifyAndHandleInfrastructureError($lastError)) { |
| 126 |
$this->logger->errorMessage($errorContext); |
| 127 |
} |
| 128 |
return false; |
| 129 |
} |
| 130 |
|
| 131 |
$this->cacheCountMemo = null; |
| 132 |
if (!$skipInvalidation) { |
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$this->invalidateCoverageCaches(); |
| 134 |
} |
| 135 |
|
| 136 |
return true; |
| 137 |
} |
| 138 |
|
| 139 |
/** |
| 140 |
* Get N-grams for a specific page. |
| 141 |
* |
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* @param int $pageId |
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* @param string $type |
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* @return array{bi: array<int, string>, tri: array<int, string>}|null |
| 145 |
*/ |
| 146 |
public function getNGramsForPage($pageId, $type = 'post') { |
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$table = $this->dbCore->tableNameResolver()->getPrefixedTableName('abj404_ngram_cache'); |
| 148 |
|
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$queryResult = $this->dbCore->queryAndGetResults( |
| 150 |
"SELECT ngrams FROM {$table} WHERE id = %d AND type = %s", |
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['query_params' => [$pageId, $type]] |
| 152 |
); |
| 153 |
|
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$rows = isset($queryResult['rows']) && is_array($queryResult['rows']) ? $queryResult['rows'] : []; |
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$first = $rows[0] ?? null; |
| 156 |
if (!is_array($first) || !isset($first['ngrams']) || !is_string($first['ngrams'])) { |
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return null; |
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} |
| 159 |
|
| 160 |
$decoded = json_decode($first['ngrams'], true); |
| 161 |
if (!is_array($decoded) || !isset($decoded['bi'], $decoded['tri'])) { |
| 162 |
return null; |
| 163 |
} |
| 164 |
/** @var array{bi: array<int, string>, tri: array<int, string>} $decoded */ |
| 165 |
return $decoded; |
| 166 |
} |
| 167 |
|
| 168 |
/** |
| 169 |
* Get all cached N-grams for similarity queries. |
| 170 |
* |
| 171 |
* Loads entire table into memory; only safe for small caches. Above |
| 172 |
* CACHE_LOAD_LIMIT (1000) callers should use getCachedNGramsFiltered(). |
| 173 |
* |
| 174 |
* @param string|null $type When non-null, restrict the load to a single |
| 175 |
* entity type ('post', 'category', 'tag', ...). Null preserves the |
| 176 |
* historical all-types scan (the posts path is unaffected). |
| 177 |
* @return array<int, array<string, mixed>> |
| 178 |
*/ |
| 179 |
public function getAllCachedNGrams($type = null) { |
| 180 |
$table = $this->dbCore->tableNameResolver()->getPrefixedTableName('abj404_ngram_cache'); |
| 181 |
|
| 182 |
$count = ($type !== null) |
| 183 |
? $this->getCacheCountForType((string)$type) |
| 184 |
: $this->dbCore->queryScalarInt("SELECT COUNT(*) AS c FROM {$table}"); |
| 185 |
if ($count > 10000) { |
| 186 |
$this->logger->errorMessage("CRITICAL: N-gram cache has {$count} entries. Cannot load into memory. Feature disabled for this request."); |
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return []; |
| 188 |
} |
| 189 |
|
| 190 |
if ($count > 5000) { |
| 191 |
$this->logger->infoMessage("WARNING: N-gram cache has {$count} entries. This may cause memory issues."); |
| 192 |
} |
| 193 |
|
| 194 |
if ($type !== null) { |
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$listResult = $this->dbCore->queryAndGetResults( |
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"SELECT id, url, url_normalized, ngrams, ngram_count FROM {$table} WHERE type = %s", |
| 197 |
['query_params' => [(string)$type]] |
| 198 |
); |
| 199 |
} else { |
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$listResult = $this->dbCore->queryAndGetResults( |
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"SELECT id, url, url_normalized, ngrams, ngram_count FROM {$table}" |
| 202 |
); |
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} |
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$results = isset($listResult['rows']) && is_array($listResult['rows']) ? $listResult['rows'] : []; |
| 205 |
|
| 206 |
if (empty($results)) { |
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return []; |
| 208 |
} |
| 209 |
|
| 210 |
$output = []; |
| 211 |
foreach ($results as $row) { |
| 212 |
if (is_object($row)) { |
| 213 |
$row = (array) $row; |
| 214 |
} |
| 215 |
if (!is_array($row)) { |
| 216 |
continue; |
| 217 |
} |
| 218 |
$ngramsRaw = isset($row['ngrams']) && is_string($row['ngrams']) ? $row['ngrams'] : ''; |
| 219 |
$row['ngrams'] = json_decode($ngramsRaw, true); |
| 220 |
$output[] = $row; |
| 221 |
} |
| 222 |
|
| 223 |
return $output; |
| 224 |
} |
| 225 |
|
| 226 |
/** |
| 227 |
* Get cached N-grams with database-side range filtering. |
| 228 |
* |
| 229 |
* Two-range strategy avoids filesort from ORDER BY ABS(): splits the |
| 230 |
* query into below-target (DESC) and above-target (ASC), then merges |
| 231 |
* by proximity to target in PHP. |
| 232 |
* |
| 233 |
* @param int $minNgramCount |
| 234 |
* @param int $maxNgramCount |
| 235 |
* @param int $limit |
| 236 |
* @param int|null $targetNgramCount |
| 237 |
* @param string|null $type When non-null, restrict to a single entity type |
| 238 |
* ('post', 'category', 'tag', ...). Null preserves the all-types scan. |
| 239 |
* @return array<int, array<string, mixed>> |
| 240 |
*/ |
| 241 |
public function getCachedNGramsFiltered($minNgramCount, $maxNgramCount, $limit = 1000, $targetNgramCount = null, $type = null) { |
| 242 |
$table = $this->dbCore->tableNameResolver()->getPrefixedTableName('abj404_ngram_cache'); |
| 243 |
|
| 244 |
$orderTarget = ($targetNgramCount !== null) |
| 245 |
? max($minNgramCount, min($maxNgramCount, (int)$targetNgramCount)) |
| 246 |
: (int)(($minNgramCount + $maxNgramCount) / 2); |
| 247 |
|
| 248 |
$halfLimit = (int)ceil($limit / 2); |
| 249 |
|
| 250 |
$resultsBelow = $this->fetchBelowTarget($table, $minNgramCount, $orderTarget, $halfLimit, 0, $type); |
| 251 |
$belowCount = count($resultsBelow); |
| 252 |
$aboveLimit = $limit - $belowCount; |
| 253 |
$resultsAbove = $this->fetchAboveTarget($table, $orderTarget, $maxNgramCount, $aboveLimit, 0, $type); |
| 254 |
$aboveCount = count($resultsAbove); |
| 255 |
|
| 256 |
$totalFetched = $belowCount + $aboveCount; |
| 257 |
// Balance for skewed distributions: if one side hit its cap and the |
| 258 |
// other has headroom, pull more from the saturated side. |
| 259 |
if ($totalFetched < $limit && $belowCount === $halfLimit) { |
| 260 |
$extra = $this->fetchBelowTarget($table, $minNgramCount, $orderTarget, $limit - $totalFetched, $belowCount, $type); |
| 261 |
$resultsBelow = array_merge($resultsBelow, $extra); |
| 262 |
$totalFetched = count($resultsBelow) + $aboveCount; |
| 263 |
} |
| 264 |
if ($totalFetched < $limit && $aboveCount === $aboveLimit) { |
| 265 |
$extra = $this->fetchAboveTarget($table, $orderTarget, $maxNgramCount, $limit - $totalFetched, $aboveCount, $type); |
| 266 |
$resultsAbove = array_merge($resultsAbove, $extra); |
| 267 |
} |
| 268 |
|
| 269 |
$merged = $this->similarity->mergeByProximity($resultsBelow, $resultsAbove, $orderTarget, $limit); |
| 270 |
return $this->decodeNGramRows($merged); |
| 271 |
} |
| 272 |
|
| 273 |
/** |
| 274 |
* @param string $table |
| 275 |
* @param int $minNgramCount |
| 276 |
* @param int $orderTarget |
| 277 |
* @param int $limit |
| 278 |
* @param int $offset |
| 279 |
* @param string|null $type Optional single-type restriction. |
| 280 |
* @return array<int, mixed> |
| 281 |
*/ |
| 282 |
private function fetchBelowTarget($table, $minNgramCount, $orderTarget, $limit, $offset = 0, $type = null) { |
| 283 |
$typeClause = ($type !== null) ? " AND type = %s" : ''; |
| 284 |
$params = ($type !== null) |
| 285 |
? [$minNgramCount, $orderTarget, (string)$type, $limit, $offset] |
| 286 |
: [$minNgramCount, $orderTarget, $limit, $offset]; |
| 287 |
$result = $this->dbCore->queryAndGetResults( |
| 288 |
"SELECT id, url, url_normalized, ngrams, ngram_count |
| 289 |
FROM {$table} |
| 290 |
WHERE ngram_count >= %d AND ngram_count <= %d{$typeClause} |
| 291 |
ORDER BY ngram_count DESC |
| 292 |
LIMIT %d OFFSET %d", |
| 293 |
['query_params' => $params] |
| 294 |
); |
| 295 |
return isset($result['rows']) && is_array($result['rows']) ? $result['rows'] : []; |
| 296 |
} |
| 297 |
|
| 298 |
/** |
| 299 |
* @param string $table |
| 300 |
* @param int $orderTarget |
| 301 |
* @param int $maxNgramCount |
| 302 |
* @param int $limit |
| 303 |
* @param int $offset |
| 304 |
* @param string|null $type Optional single-type restriction. |
| 305 |
* @return array<int, mixed> |
| 306 |
*/ |
| 307 |
private function fetchAboveTarget($table, $orderTarget, $maxNgramCount, $limit, $offset = 0, $type = null) { |
| 308 |
$typeClause = ($type !== null) ? " AND type = %s" : ''; |
| 309 |
$params = ($type !== null) |
| 310 |
? [$orderTarget, $maxNgramCount, (string)$type, $limit, $offset] |
| 311 |
: [$orderTarget, $maxNgramCount, $limit, $offset]; |
| 312 |
$result = $this->dbCore->queryAndGetResults( |
| 313 |
"SELECT id, url, url_normalized, ngrams, ngram_count |
| 314 |
FROM {$table} |
| 315 |
WHERE ngram_count > %d AND ngram_count <= %d{$typeClause} |
| 316 |
ORDER BY ngram_count ASC |
| 317 |
LIMIT %d OFFSET %d", |
| 318 |
['query_params' => $params] |
| 319 |
); |
| 320 |
return isset($result['rows']) && is_array($result['rows']) ? $result['rows'] : []; |
| 321 |
} |
| 322 |
|
| 323 |
/** |
| 324 |
* @param array<int, mixed> $rows |
| 325 |
* @return array<int, array<string, mixed>> |
| 326 |
*/ |
| 327 |
private function decodeNGramRows(array $rows) { |
| 328 |
$validResults = []; |
| 329 |
foreach ($rows as $row) { |
| 330 |
if (!is_array($row)) { |
| 331 |
continue; |
| 332 |
} |
| 333 |
$ngramsJson = isset($row['ngrams']) && is_string($row['ngrams']) ? $row['ngrams'] : ''; |
| 334 |
$decoded = json_decode($ngramsJson, true); |
| 335 |
if ($decoded === null && json_last_error() !== JSON_ERROR_NONE) { |
| 336 |
$rowId = isset($row['id']) ? $row['id'] : 0; |
| 337 |
$this->logger->errorMessage(sprintf( |
| 338 |
"Corrupt N-gram JSON for page ID %s: %s", |
| 339 |
(is_scalar($rowId) ? (string)$rowId : '0'), |
| 340 |
json_last_error_msg() |
| 341 |
)); |
| 342 |
continue; |
| 343 |
} |
| 344 |
$row['ngrams'] = $decoded; |
| 345 |
$validResults[] = $row; |
| 346 |
} |
| 347 |
return $validResults; |
| 348 |
} |
| 349 |
|
| 350 |
/** |
| 351 |
* Invalidate (delete) N-grams for a specific page. |
| 352 |
* |
| 353 |
* @param int $pageId |
| 354 |
* @param string $type |
| 355 |
* @return bool |
| 356 |
*/ |
| 357 |
public function invalidatePage($pageId, $type = 'post') { |
| 358 |
$table = $this->dbCore->tableNameResolver()->getPrefixedTableName('abj404_ngram_cache'); |
| 359 |
$queryResult = $this->dbCore->queryAndGetResults( |
| 360 |
"DELETE FROM {$table} WHERE id = %d AND type = %s", |
| 361 |
['query_params' => [(int)$pageId, $type]] |
| 362 |
); |
| 363 |
|
| 364 |
$lastError = isset($queryResult['last_error']) && is_string($queryResult['last_error']) ? $queryResult['last_error'] : ''; |
| 365 |
$success = $lastError === ''; |
| 366 |
if ($success) { |
| 367 |
$this->cacheCountMemo = null; |
| 368 |
$this->invalidateCoverageCaches(); |
| 369 |
} |
| 370 |
|
| 371 |
return $success; |
| 372 |
} |
| 373 |
|
| 374 |
/** |
| 375 |
* Get cache entry count (memoized per-request). |
| 376 |
* |
| 377 |
* Use this instead of getCacheStats() when only the count is needed. |
| 378 |
* |
| 379 |
* @return int |
| 380 |
*/ |
| 381 |
public function getCacheCount() { |
| 382 |
if ($this->cacheCountMemo !== null) { |
| 383 |
return $this->cacheCountMemo; |
| 384 |
} |
| 385 |
|
| 386 |
global $wpdb; |
| 387 |
$table = $this->dbCore->tableNameResolver()->getPrefixedTableName('abj404_ngram_cache'); |
| 388 |
if (!isset($wpdb) || !is_object($wpdb) || !is_callable([$wpdb, 'get_var'])) { |
| 389 |
// Test environments / very early bootstrap: treat as no cache. |
| 390 |
$this->cacheCountMemo = 0; |
| 391 |
return $this->cacheCountMemo; |
| 392 |
} |
| 393 |
|
| 394 |
$this->cacheCountMemo = $this->dbCore->queryScalarInt("SELECT COUNT(*) AS c FROM {$table}"); |
| 395 |
return $this->cacheCountMemo; |
| 396 |
} |
| 397 |
|
| 398 |
/** |
| 399 |
* Count cache entries of a single type ('post', 'category', 'tag', ...). |
| 400 |
* |
| 401 |
* Used by the type-scoped term prefilter to make its load-limit decision |
| 402 |
* and to feed the term coverage policy's readiness gate. Not memoized: |
| 403 |
* the term path calls this at most twice per request (count + ratio), |
| 404 |
* both against the indexed `type` column. |
| 405 |
* |
| 406 |
* @param string $type |
| 407 |
* @return int |
| 408 |
*/ |
| 409 |
public function getCacheCountForType(string $type): int { |
| 410 |
$table = $this->dbCore->tableNameResolver()->getPrefixedTableName('abj404_ngram_cache'); |
| 411 |
return $this->dbCore->queryScalarInt( |
| 412 |
"SELECT COUNT(*) AS c FROM {$table} WHERE type = %s", |
| 413 |
['query_params' => [$type]] |
| 414 |
); |
| 415 |
} |
| 416 |
|
| 417 |
/** |
| 418 |
* Reset per-request memoization. |
| 419 |
* |
| 420 |
* Used after bulk operations that bypass storeNGrams() (e.g. TRUNCATE |
| 421 |
* during rebuild) so the next getCacheCount() reads fresh state. |
| 422 |
* |
| 423 |
* @return void |
| 424 |
*/ |
| 425 |
public function resetMemo() { |
| 426 |
$this->cacheCountMemo = null; |
| 427 |
} |
| 428 |
|
| 429 |
/** |
| 430 |
* Get cache statistics for admin display. |
| 431 |
* |
| 432 |
* @return array<string, mixed> |
| 433 |
*/ |
| 434 |
public function getCacheStats() { |
| 435 |
$table = $this->dbCore->tableNameResolver()->getPrefixedTableName('abj404_ngram_cache'); |
| 436 |
|
| 437 |
$totalEntries = $this->dbCore->queryScalarInt("SELECT COUNT(*) AS c FROM {$table}"); |
| 438 |
$postsEntries = $this->getCacheCountForType('post'); |
| 439 |
$categoryEntries = $this->getCacheCountForType('category'); |
| 440 |
$tagEntries = $this->getCacheCountForType('tag'); |
| 441 |
$lastUpdatedResult = $this->dbCore->queryAndGetResults( |
| 442 |
"SELECT MAX(last_updated) AS m FROM {$table}" |
| 443 |
); |
| 444 |
$lastUpdatedRows = isset($lastUpdatedResult['rows']) && is_array($lastUpdatedResult['rows']) ? $lastUpdatedResult['rows'] : []; |
| 445 |
$lastUpdatedFirst = $lastUpdatedRows[0] ?? null; |
| 446 |
$lastUpdated = is_array($lastUpdatedFirst) && isset($lastUpdatedFirst['m']) ? $lastUpdatedFirst['m'] : null; |
| 447 |
|
| 448 |
return [ |
| 449 |
'total_entries' => $totalEntries, |
| 450 |
'posts_entries' => $postsEntries, |
| 451 |
'category_entries' => $categoryEntries, |
| 452 |
'tag_entries' => $tagEntries, |
| 453 |
'last_updated' => $lastUpdated, |
| 454 |
]; |
| 455 |
} |
| 456 |
|
| 457 |
/** |
| 458 |
* Invalidate coverage caches by resolving the policy lazily. |
| 459 |
* |
| 460 |
* Lazy resolution avoids constructor-time coupling between the |
| 461 |
* repository and coverage policy services. |
| 462 |
* |
| 463 |
* @return void |
| 464 |
*/ |
| 465 |
private function invalidateCoverageCaches() { |
| 466 |
$resolver = $this->coveragePolicyResolver; |
| 467 |
if (!is_callable($resolver)) { |
| 468 |
return; |
| 469 |
} |
| 470 |
$policy = $resolver(); |
| 471 |
if ($policy instanceof ABJ_404_Solution_NGramCoveragePolicy) { |
| 472 |
$policy->invalidateCoverageCaches(); |
| 473 |
} |
| 474 |
} |
| 475 |
} |
| 476 |
|
