Code Coverage |
||||||||||
Lines |
Functions and Methods |
Classes and Traits |
||||||||
| Total | |
74.80% |
567 / 758 |
|
48.21% |
27 / 56 |
CRAP | |
0.00% |
0 / 1 |
| SqlBagOStuff | |
74.80% |
567 / 758 |
|
48.21% |
27 / 56 |
839.96 | |
0.00% |
0 / 1 |
| __construct | |
77.78% |
21 / 27 |
|
0.00% |
0 / 1 |
7.54 | |||
| doGet | |
100.00% |
12 / 12 |
|
100.00% |
1 / 1 |
4 | |||
| doSet | |
100.00% |
6 / 6 |
|
100.00% |
1 / 1 |
1 | |||
| doDelete | |
100.00% |
6 / 6 |
|
100.00% |
1 / 1 |
1 | |||
| doAdd | |
87.50% |
7 / 8 |
|
0.00% |
0 / 1 |
2.01 | |||
| doCas | |
87.50% |
7 / 8 |
|
0.00% |
0 / 1 |
2.01 | |||
| doChangeTTL | |
100.00% |
6 / 6 |
|
100.00% |
1 / 1 |
1 | |||
| doIncrWithInit | |
100.00% |
11 / 11 |
|
100.00% |
1 / 1 |
3 | |||
| doGetMulti | |
100.00% |
15 / 15 |
|
100.00% |
1 / 1 |
4 | |||
| doSetMulti | |
100.00% |
11 / 11 |
|
100.00% |
1 / 1 |
1 | |||
| doDeleteMulti | |
100.00% |
6 / 6 |
|
100.00% |
1 / 1 |
1 | |||
| doChangeTTLMulti | |
100.00% |
6 / 6 |
|
100.00% |
1 / 1 |
1 | |||
| getConnection | |
80.00% |
8 / 10 |
|
0.00% |
0 / 1 |
5.20 | |||
| getKeyLocation | |
58.33% |
7 / 12 |
|
0.00% |
0 / 1 |
5.16 | |||
| getTableNameByShard | |
50.00% |
2 / 4 |
|
0.00% |
0 / 1 |
4.12 | |||
| fetchBlobs | |
90.00% |
36 / 40 |
|
0.00% |
0 / 1 |
11.12 | |||
| modifyBlobs | |
79.17% |
19 / 24 |
|
0.00% |
0 / 1 |
10.90 | |||
| modifyTableSpecificBlobsForSet | |
100.00% |
24 / 24 |
|
100.00% |
1 / 1 |
4 | |||
| modifyTableSpecificBlobsForDelete | |
100.00% |
18 / 18 |
|
100.00% |
1 / 1 |
4 | |||
| modifyTableSpecificBlobsForAdd | |
100.00% |
30 / 30 |
|
100.00% |
1 / 1 |
5 | |||
| modifyTableSpecificBlobsForCas | |
92.31% |
36 / 39 |
|
0.00% |
0 / 1 |
7.02 | |||
| modifyTableSpecificBlobsForChangeTTL | |
100.00% |
44 / 44 |
|
100.00% |
1 / 1 |
9 | |||
| modifyTableSpecificBlobsForIncrInit | |
77.42% |
24 / 31 |
|
0.00% |
0 / 1 |
6.41 | |||
| modifyTableSpecificBlobsForIncrInitAsync | |
92.31% |
12 / 13 |
|
0.00% |
0 / 1 |
3.00 | |||
| makeNewKeyExpiry | |
100.00% |
4 / 4 |
|
100.00% |
1 / 1 |
2 | |||
| newLockingWriteSectionModificationTimestamp | |
83.33% |
5 / 6 |
|
0.00% |
0 / 1 |
2.02 | |||
| makeTimestampedModificationToken | |
93.75% |
15 / 16 |
|
0.00% |
0 / 1 |
2.00 | |||
| buildExistenceConditions | |
100.00% |
4 / 4 |
|
100.00% |
1 / 1 |
1 | |||
| buildUpsertRow | |
100.00% |
8 / 8 |
|
100.00% |
1 / 1 |
2 | |||
| buildMultiUpsertSetForOverwrite | |
100.00% |
18 / 18 |
|
100.00% |
1 / 1 |
4 | |||
| buildIncrUpsertSet | |
100.00% |
21 / 21 |
|
100.00% |
1 / 1 |
3 | |||
| encodeDbExpiry | |
100.00% |
5 / 5 |
|
100.00% |
1 / 1 |
2 | |||
| decodeDbExpiry | |
100.00% |
3 / 3 |
|
100.00% |
1 / 1 |
2 | |||
| dbEncodeSerialValue | |
100.00% |
1 / 1 |
|
100.00% |
1 / 1 |
2 | |||
| dbDecodeSerialValue | |
100.00% |
1 / 1 |
|
100.00% |
1 / 1 |
2 | |||
| addCasTokenFields | |
44.44% |
8 / 18 |
|
0.00% |
0 / 1 |
9.29 | |||
| getCasTokenFromRow | |
80.00% |
4 / 5 |
|
0.00% |
0 / 1 |
2.03 | |||
| garbageCollect | |
92.86% |
13 / 14 |
|
0.00% |
0 / 1 |
2.00 | |||
| expireAll | |
0.00% |
0 / 2 |
|
0.00% |
0 / 1 |
2 | |||
| deleteObjectsExpiringBefore | |
0.00% |
0 / 34 |
|
0.00% |
0 / 1 |
90 | |||
| deleteServerObjectsExpiringBefore | |
42.86% |
21 / 49 |
|
0.00% |
0 / 1 |
33.58 | |||
| deleteAll | |
0.00% |
0 / 13 |
|
0.00% |
0 / 1 |
20 | |||
| doLock | |
50.00% |
6 / 12 |
|
0.00% |
0 / 1 |
2.50 | |||
| doUnlock | |
62.50% |
5 / 8 |
|
0.00% |
0 / 1 |
2.21 | |||
| makeKeyInternal | |
100.00% |
13 / 13 |
|
100.00% |
1 / 1 |
5 | |||
| requireConvertGenericKey | |
0.00% |
0 / 1 |
|
0.00% |
0 / 1 |
2 | |||
| serialize | |
100.00% |
6 / 6 |
|
100.00% |
1 / 1 |
3 | |||
| unserialize | |
90.91% |
10 / 11 |
|
0.00% |
0 / 1 |
5.02 | |||
| getLoadBalancer | |
100.00% |
3 / 3 |
|
100.00% |
1 / 1 |
2 | |||
| getConnectionViaLoadBalancer | |
45.45% |
5 / 11 |
|
0.00% |
0 / 1 |
4.46 | |||
| getConnectionFromServerInfo | |
100.00% |
9 / 9 |
|
100.00% |
1 / 1 |
3 | |||
| handleDBError | |
0.00% |
0 / 18 |
|
0.00% |
0 / 1 |
42 | |||
| initSqliteDatabase | |
10.53% |
2 / 19 |
|
0.00% |
0 / 1 |
9.45 | |||
| createTables | |
0.00% |
0 / 7 |
|
0.00% |
0 / 1 |
20 | |||
| getShardServerIndexes | |
0.00% |
0 / 4 |
|
0.00% |
0 / 1 |
6 | |||
| silenceTransactionProfiler | |
100.00% |
3 / 3 |
|
100.00% |
1 / 1 |
2 | |||
| 1 | <?php |
| 2 | /** |
| 3 | * Object caching using a SQL database. |
| 4 | * |
| 5 | * This program is free software; you can redistribute it and/or modify |
| 6 | * it under the terms of the GNU General Public License as published by |
| 7 | * the Free Software Foundation; either version 2 of the License, or |
| 8 | * (at your option) any later version. |
| 9 | * |
| 10 | * This program is distributed in the hope that it will be useful, |
| 11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 13 | * GNU General Public License for more details. |
| 14 | * |
| 15 | * You should have received a copy of the GNU General Public License along |
| 16 | * with this program; if not, write to the Free Software Foundation, Inc., |
| 17 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. |
| 18 | * http://www.gnu.org/copyleft/gpl.html |
| 19 | * |
| 20 | * @file |
| 21 | * @ingroup Cache |
| 22 | */ |
| 23 | |
| 24 | use MediaWiki\MediaWikiServices; |
| 25 | use Wikimedia\AtEase\AtEase; |
| 26 | use Wikimedia\Rdbms\Blob; |
| 27 | use Wikimedia\Rdbms\Database; |
| 28 | use Wikimedia\Rdbms\DBConnectionError; |
| 29 | use Wikimedia\Rdbms\DBError; |
| 30 | use Wikimedia\Rdbms\DBQueryError; |
| 31 | use Wikimedia\Rdbms\IDatabase; |
| 32 | use Wikimedia\Rdbms\ILoadBalancer; |
| 33 | use Wikimedia\Rdbms\IMaintainableDatabase; |
| 34 | use Wikimedia\Rdbms\SelectQueryBuilder; |
| 35 | use Wikimedia\ScopedCallback; |
| 36 | use Wikimedia\Timestamp\ConvertibleTimestamp; |
| 37 | |
| 38 | /** |
| 39 | * RDBMS-based caching module |
| 40 | * |
| 41 | * The following database sharding schemes are supported: |
| 42 | * - None; all keys map to the same shard |
| 43 | * - Hash; keys map to shards via consistent hashing |
| 44 | * |
| 45 | * The following database replication topologies are supported: |
| 46 | * - A primary database server for each shard, all within one datacenter |
| 47 | * - A co-primary database server for each shard within each datacenter |
| 48 | * |
| 49 | * @ingroup Cache |
| 50 | */ |
| 51 | class SqlBagOStuff extends MediumSpecificBagOStuff { |
| 52 | /** @var callable|null Injected function which returns a LoadBalancer */ |
| 53 | protected $loadBalancerCallback; |
| 54 | /** @var ILoadBalancer|null */ |
| 55 | protected $loadBalancer; |
| 56 | /** @var string|false|null DB name used for keys using the LoadBalancer */ |
| 57 | protected $dbDomain; |
| 58 | /** @var bool Whether to use the LoadBalancer */ |
| 59 | protected $useLB = false; |
| 60 | |
| 61 | /** @var array[] (server index => server config) */ |
| 62 | protected $serverInfos = []; |
| 63 | /** @var string[] (server index => tag/host name) */ |
| 64 | protected $serverTags = []; |
| 65 | /** @var float UNIX timestamp */ |
| 66 | protected $lastGarbageCollect = 0; |
| 67 | /** @var int Average number of writes required to trigger garbage collection */ |
| 68 | protected $purgePeriod = 10; |
| 69 | /** @var int Max expired rows to purge during randomized garbage collection */ |
| 70 | protected $purgeLimit = 100; |
| 71 | /** @var int Number of table shards to use on each server */ |
| 72 | protected $numTableShards = 1; |
| 73 | /** @var int */ |
| 74 | protected $writeBatchSize = 100; |
| 75 | /** @var string */ |
| 76 | protected $tableName = 'objectcache'; |
| 77 | /** @var bool Whether to use replicas instead of primaries (if using LoadBalancer) */ |
| 78 | protected $replicaOnly; |
| 79 | /** @var bool Whether multi-primary mode is enabled */ |
| 80 | protected $multiPrimaryMode; |
| 81 | |
| 82 | /** @var IMaintainableDatabase[] Map of (shard index => DB handle) */ |
| 83 | protected $conns; |
| 84 | /** @var float[] Map of (shard index => UNIX timestamps) */ |
| 85 | protected $connFailureTimes = []; |
| 86 | /** @var Exception[] Map of (shard index => Exception) */ |
| 87 | protected $connFailureErrors = []; |
| 88 | |
| 89 | /** @var bool Whether zlib methods are available to PHP */ |
| 90 | private $hasZlib; |
| 91 | |
| 92 | /** A number of seconds well above any expected clock skew */ |
| 93 | private const SAFE_CLOCK_BOUND_SEC = 15; |
| 94 | /** A number of seconds well above any expected clock skew and replication lag */ |
| 95 | private const SAFE_PURGE_DELAY_SEC = 3600; |
| 96 | /** Distinct string for tombstones stored in the "serialized" value column */ |
| 97 | private const TOMB_SERIAL = ''; |
| 98 | /** Relative seconds-to-live to use for tombstones */ |
| 99 | private const TOMB_EXPTIME = -self::SAFE_CLOCK_BOUND_SEC; |
| 100 | /** How many seconds must pass before triggering a garbage collection */ |
| 101 | private const GC_DELAY_SEC = 1; |
| 102 | |
| 103 | private const BLOB_VALUE = 0; |
| 104 | private const BLOB_EXPIRY = 1; |
| 105 | private const BLOB_CASTOKEN = 2; |
| 106 | |
| 107 | /** |
| 108 | * Placeholder timestamp to use for TTL_INDEFINITE that can be stored in all RDBMs types. |
| 109 | * We use BINARY(14) for MySQL, BLOB for Sqlite, and TIMESTAMPZ for Postgres (which goes |
| 110 | * up to 294276 AD). The last second of the year 9999 can be stored in all these cases. |
| 111 | * https://www.postgresql.org/docs/9.0/datatype-datetime.html |
| 112 | */ |
| 113 | private const INF_TIMESTAMP_PLACEHOLDER = '99991231235959'; |
| 114 | |
| 115 | /** |
| 116 | * Create a new backend instance from parameters injected by ObjectCache::newFromParams() |
| 117 | * |
| 118 | * The database servers must be provided by *either* the "server" parameter, the "servers" |
| 119 | * parameter or the "loadBalancer" parameter. |
| 120 | * |
| 121 | * The parameters are as described at {@link \MediaWiki\MainConfigSchema::ObjectCaches} |
| 122 | * except that: |
| 123 | * |
| 124 | * - the configured "cluster" and main LB fallback modes are implemented by |
| 125 | * the wiring by passing "loadBalancerCallback". |
| 126 | * - "dbDomain" is required if "loadBalancerCallback" is set, whereas in |
| 127 | * config it may be absent. |
| 128 | * |
| 129 | * @internal |
| 130 | * |
| 131 | * @param array $params |
| 132 | * - server: string |
| 133 | * - servers: string[] |
| 134 | * - loadBalancerCallback: A closure which provides a LoadBalancer object |
| 135 | * - dbDomain: string|false |
| 136 | * - multiPrimaryMode: bool |
| 137 | * - purgePeriod: int|float |
| 138 | * - purgeLimit: int |
| 139 | * - tableName: string |
| 140 | * - shards: int |
| 141 | * - replicaOnly: bool |
| 142 | * - writeBatchSize: int |
| 143 | */ |
| 144 | public function __construct( $params ) { |
| 145 | parent::__construct( $params ); |
| 146 | |
| 147 | if ( isset( $params['servers'] ) || isset( $params['server'] ) ) { |
| 148 | // Configuration uses a direct list of servers. |
| 149 | // Object data is horizontally partitioned via key hash. |
| 150 | $index = 0; |
| 151 | foreach ( ( $params['servers'] ?? [ $params['server'] ] ) as $tag => $info ) { |
| 152 | $this->serverInfos[$index] = $info; |
| 153 | // Allow integer-indexes arrays for b/c |
| 154 | $this->serverTags[$index] = is_string( $tag ) ? $tag : "#$index"; |
| 155 | ++$index; |
| 156 | } |
| 157 | } elseif ( isset( $params['loadBalancerCallback'] ) ) { |
| 158 | $this->loadBalancerCallback = $params['loadBalancerCallback']; |
| 159 | if ( !isset( $params['dbDomain'] ) ) { |
| 160 | throw new InvalidArgumentException( |
| 161 | __METHOD__ . ": 'dbDomain' is required if 'loadBalancerCallback' is given" |
| 162 | ); |
| 163 | } |
| 164 | $this->dbDomain = $params['dbDomain']; |
| 165 | $this->useLB = true; |
| 166 | } else { |
| 167 | throw new InvalidArgumentException( |
| 168 | __METHOD__ . " requires 'server', 'servers', or 'loadBalancerCallback'" |
| 169 | ); |
| 170 | } |
| 171 | |
| 172 | $this->purgePeriod = intval( $params['purgePeriod'] ?? $this->purgePeriod ); |
| 173 | $this->purgeLimit = intval( $params['purgeLimit'] ?? $this->purgeLimit ); |
| 174 | $this->tableName = $params['tableName'] ?? $this->tableName; |
| 175 | $this->numTableShards = intval( $params['shards'] ?? $this->numTableShards ); |
| 176 | $this->writeBatchSize = intval( $params['writeBatchSize'] ?? $this->writeBatchSize ); |
| 177 | $this->replicaOnly = $params['replicaOnly'] ?? false; |
| 178 | $this->multiPrimaryMode = $params['multiPrimaryMode'] ?? false; |
| 179 | |
| 180 | $this->attrMap[self::ATTR_DURABILITY] = self::QOS_DURABILITY_RDBMS; |
| 181 | |
| 182 | $this->hasZlib = extension_loaded( 'zlib' ); |
| 183 | } |
| 184 | |
| 185 | protected function doGet( $key, $flags = 0, &$casToken = null ) { |
| 186 | $getToken = ( $casToken === self::PASS_BY_REF ); |
| 187 | $casToken = null; |
| 188 | |
| 189 | $data = $this->fetchBlobs( [ $key ], $getToken )[$key]; |
| 190 | if ( $data ) { |
| 191 | $result = $this->unserialize( $data[self::BLOB_VALUE] ); |
| 192 | if ( $getToken && $result !== false ) { |
| 193 | $casToken = $data[self::BLOB_CASTOKEN]; |
| 194 | } |
| 195 | $valueSize = strlen( $data[self::BLOB_VALUE] ); |
| 196 | } else { |
| 197 | $result = false; |
| 198 | $valueSize = false; |
| 199 | } |
| 200 | |
| 201 | $this->updateOpStats( self::METRIC_OP_GET, [ $key => [ 0, $valueSize ] ] ); |
| 202 | |
| 203 | return $result; |
| 204 | } |
| 205 | |
| 206 | protected function doSet( $key, $value, $exptime = 0, $flags = 0 ) { |
| 207 | $mtime = $this->getCurrentTime(); |
| 208 | |
| 209 | return $this->modifyBlobs( |
| 210 | [ $this, 'modifyTableSpecificBlobsForSet' ], |
| 211 | $mtime, |
| 212 | [ $key => [ $value, $exptime ] ] |
| 213 | ); |
| 214 | } |
| 215 | |
| 216 | protected function doDelete( $key, $flags = 0 ) { |
| 217 | $mtime = $this->getCurrentTime(); |
| 218 | |
| 219 | return $this->modifyBlobs( |
| 220 | [ $this, 'modifyTableSpecificBlobsForDelete' ], |
| 221 | $mtime, |
| 222 | [ $key => [] ] |
| 223 | ); |
| 224 | } |
| 225 | |
| 226 | protected function doAdd( $key, $value, $exptime = 0, $flags = 0 ) { |
| 227 | $mtime = $this->newLockingWriteSectionModificationTimestamp( $key, $scope ); |
| 228 | if ( $mtime === null ) { |
| 229 | // Timeout or I/O error during lock acquisition |
| 230 | return false; |
| 231 | } |
| 232 | |
| 233 | return $this->modifyBlobs( |
| 234 | [ $this, 'modifyTableSpecificBlobsForAdd' ], |
| 235 | $mtime, |
| 236 | [ $key => [ $value, $exptime ] ] |
| 237 | ); |
| 238 | } |
| 239 | |
| 240 | protected function doCas( $casToken, $key, $value, $exptime = 0, $flags = 0 ) { |
| 241 | $mtime = $this->newLockingWriteSectionModificationTimestamp( $key, $scope ); |
| 242 | if ( $mtime === null ) { |
| 243 | // Timeout or I/O error during lock acquisition |
| 244 | return false; |
| 245 | } |
| 246 | |
| 247 | return $this->modifyBlobs( |
| 248 | [ $this, 'modifyTableSpecificBlobsForCas' ], |
| 249 | $mtime, |
| 250 | [ $key => [ $value, $exptime, $casToken ] ] |
| 251 | ); |
| 252 | } |
| 253 | |
| 254 | protected function doChangeTTL( $key, $exptime, $flags ) { |
| 255 | $mtime = $this->getCurrentTime(); |
| 256 | |
| 257 | return $this->modifyBlobs( |
| 258 | [ $this, 'modifyTableSpecificBlobsForChangeTTL' ], |
| 259 | $mtime, |
| 260 | [ $key => [ $exptime ] ] |
| 261 | ); |
| 262 | } |
| 263 | |
| 264 | protected function doIncrWithInit( $key, $exptime, $step, $init, $flags ) { |
| 265 | $mtime = $this->getCurrentTime(); |
| 266 | |
| 267 | if ( $flags & self::WRITE_BACKGROUND ) { |
| 268 | $callback = [ $this, 'modifyTableSpecificBlobsForIncrInitAsync' ]; |
| 269 | } else { |
| 270 | $callback = [ $this, 'modifyTableSpecificBlobsForIncrInit' ]; |
| 271 | } |
| 272 | |
| 273 | $result = $this->modifyBlobs( |
| 274 | $callback, |
| 275 | $mtime, |
| 276 | [ $key => [ $step, $init, $exptime ] ], |
| 277 | $resByKey |
| 278 | ) ? $resByKey[$key] : false; |
| 279 | |
| 280 | return $result; |
| 281 | } |
| 282 | |
| 283 | protected function doGetMulti( array $keys, $flags = 0 ) { |
| 284 | $result = []; |
| 285 | $valueSizeByKey = []; |
| 286 | |
| 287 | $dataByKey = $this->fetchBlobs( $keys ); |
| 288 | foreach ( $keys as $key ) { |
| 289 | $data = $dataByKey[$key]; |
| 290 | if ( $data ) { |
| 291 | $serialValue = $data[self::BLOB_VALUE]; |
| 292 | $value = $this->unserialize( $serialValue ); |
| 293 | if ( $value !== false ) { |
| 294 | $result[$key] = $value; |
| 295 | } |
| 296 | $valueSize = strlen( $serialValue ); |
| 297 | } else { |
| 298 | $valueSize = false; |
| 299 | } |
| 300 | $valueSizeByKey[$key] = [ 0, $valueSize ]; |
| 301 | } |
| 302 | |
| 303 | $this->updateOpStats( self::METRIC_OP_GET, $valueSizeByKey ); |
| 304 | |
| 305 | return $result; |
| 306 | } |
| 307 | |
| 308 | protected function doSetMulti( array $data, $exptime = 0, $flags = 0 ) { |
| 309 | $mtime = $this->getCurrentTime(); |
| 310 | |
| 311 | return $this->modifyBlobs( |
| 312 | [ $this, 'modifyTableSpecificBlobsForSet' ], |
| 313 | $mtime, |
| 314 | array_map( |
| 315 | static function ( $value ) use ( $exptime ) { |
| 316 | return [ $value, $exptime ]; |
| 317 | }, |
| 318 | $data |
| 319 | ) |
| 320 | ); |
| 321 | } |
| 322 | |
| 323 | protected function doDeleteMulti( array $keys, $flags = 0 ) { |
| 324 | $mtime = $this->getCurrentTime(); |
| 325 | |
| 326 | return $this->modifyBlobs( |
| 327 | [ $this, 'modifyTableSpecificBlobsForDelete' ], |
| 328 | $mtime, |
| 329 | array_fill_keys( $keys, [] ) |
| 330 | ); |
| 331 | } |
| 332 | |
| 333 | public function doChangeTTLMulti( array $keys, $exptime, $flags = 0 ) { |
| 334 | $mtime = $this->getCurrentTime(); |
| 335 | |
| 336 | return $this->modifyBlobs( |
| 337 | [ $this, 'modifyTableSpecificBlobsForChangeTTL' ], |
| 338 | $mtime, |
| 339 | array_fill_keys( $keys, [ $exptime ] ) |
| 340 | ); |
| 341 | } |
| 342 | |
| 343 | /** |
| 344 | * Get a connection to the specified database |
| 345 | * |
| 346 | * @param int $shardIndex Server index |
| 347 | * @return IMaintainableDatabase |
| 348 | * @throws DBConnectionError |
| 349 | * @throws UnexpectedValueException |
| 350 | */ |
| 351 | private function getConnection( $shardIndex ) { |
| 352 | if ( $this->useLB ) { |
| 353 | return $this->getConnectionViaLoadBalancer(); |
| 354 | } |
| 355 | |
| 356 | // Don't keep timing out trying to connect if the server is down |
| 357 | if ( |
| 358 | isset( $this->connFailureErrors[$shardIndex] ) && |
| 359 | ( $this->getCurrentTime() - $this->connFailureTimes[$shardIndex] ) < 60 |
| 360 | ) { |
| 361 | throw $this->connFailureErrors[$shardIndex]; |
| 362 | } |
| 363 | |
| 364 | if ( isset( $this->serverInfos[$shardIndex] ) ) { |
| 365 | $server = $this->serverInfos[$shardIndex]; |
| 366 | $conn = $this->getConnectionFromServerInfo( $shardIndex, $server ); |
| 367 | } else { |
| 368 | throw new UnexpectedValueException( "Invalid server index #$shardIndex" ); |
| 369 | } |
| 370 | |
| 371 | return $conn; |
| 372 | } |
| 373 | |
| 374 | /** |
| 375 | * Get the server index and table name for a given key |
| 376 | * @param string $key |
| 377 | * @return array (server index, table name) |
| 378 | */ |
| 379 | private function getKeyLocation( $key ) { |
| 380 | if ( $this->useLB ) { |
| 381 | // LoadBalancer based configuration |
| 382 | $shardIndex = 0; |
| 383 | } else { |
| 384 | // Striped array of database servers |
| 385 | if ( count( $this->serverTags ) == 1 ) { |
| 386 | $shardIndex = 0; // short-circuit |
| 387 | } else { |
| 388 | $sortedServers = $this->serverTags; |
| 389 | ArrayUtils::consistentHashSort( $sortedServers, $key ); |
| 390 | $shardIndex = array_key_first( $sortedServers ); |
| 391 | } |
| 392 | } |
| 393 | |
| 394 | if ( $this->numTableShards > 1 ) { |
| 395 | $hash = hexdec( substr( md5( $key ), 0, 8 ) ) & 0x7fffffff; |
| 396 | $tableIndex = $hash % $this->numTableShards; |
| 397 | } else { |
| 398 | $tableIndex = null; |
| 399 | } |
| 400 | |
| 401 | return [ $shardIndex, $this->getTableNameByShard( $tableIndex ) ]; |
| 402 | } |
| 403 | |
| 404 | /** |
| 405 | * Get the table name for a given shard index |
| 406 | * @param int|null $index |
| 407 | * @return string |
| 408 | */ |
| 409 | private function getTableNameByShard( $index ) { |
| 410 | if ( $index !== null && $this->numTableShards > 1 ) { |
| 411 | $decimals = strlen( (string)( $this->numTableShards - 1 ) ); |
| 412 | |
| 413 | return $this->tableName . sprintf( "%0{$decimals}d", $index ); |
| 414 | } |
| 415 | |
| 416 | return $this->tableName; |
| 417 | } |
| 418 | |
| 419 | /** |
| 420 | * @param string[] $keys |
| 421 | * @param bool $getCasToken Whether to get a CAS token |
| 422 | * @return array<string,array|null> Order-preserved map of (key => (value,expiry,token) or null) |
| 423 | */ |
| 424 | private function fetchBlobs( array $keys, bool $getCasToken = false ) { |
| 425 | /** @noinspection PhpUnusedLocalVariableInspection */ |
| 426 | $silenceScope = $this->silenceTransactionProfiler(); |
| 427 | |
| 428 | // Initialize order-preserved per-key results; set values for live keys below |
| 429 | $dataByKey = array_fill_keys( $keys, null ); |
| 430 | |
| 431 | $readTime = (int)$this->getCurrentTime(); |
| 432 | $keysByTableByShard = []; |
| 433 | foreach ( $keys as $key ) { |
| 434 | [ $shardIndex, $partitionTable ] = $this->getKeyLocation( $key ); |
| 435 | $keysByTableByShard[$shardIndex][$partitionTable][] = $key; |
| 436 | } |
| 437 | |
| 438 | foreach ( $keysByTableByShard as $shardIndex => $serverKeys ) { |
| 439 | try { |
| 440 | $db = $this->getConnection( $shardIndex ); |
| 441 | foreach ( $serverKeys as $partitionTable => $tableKeys ) { |
| 442 | $res = $db->newSelectQueryBuilder() |
| 443 | ->select( |
| 444 | $getCasToken |
| 445 | ? $this->addCasTokenFields( $db, [ 'keyname', 'value', 'exptime' ] ) |
| 446 | : [ 'keyname', 'value', 'exptime' ] ) |
| 447 | ->from( $partitionTable ) |
| 448 | ->where( $this->buildExistenceConditions( $db, $tableKeys, $readTime ) ) |
| 449 | ->caller( __METHOD__ ) |
| 450 | ->fetchResultSet(); |
| 451 | foreach ( $res as $row ) { |
| 452 | $row->shardIndex = $shardIndex; |
| 453 | $row->tableName = $partitionTable; |
| 454 | $dataByKey[$row->keyname] = $row; |
| 455 | } |
| 456 | } |
| 457 | } catch ( DBError $e ) { |
| 458 | $this->handleDBError( $e, $shardIndex ); |
| 459 | } |
| 460 | } |
| 461 | |
| 462 | foreach ( $keys as $key ) { |
| 463 | $row = $dataByKey[$key] ?? null; |
| 464 | if ( !$row ) { |
| 465 | continue; |
| 466 | } |
| 467 | |
| 468 | $this->debug( __METHOD__ . ": retrieved $key; expiry time is {$row->exptime}" ); |
| 469 | try { |
| 470 | $db = $this->getConnection( $row->shardIndex ); |
| 471 | $dataByKey[$key] = [ |
| 472 | self::BLOB_VALUE => $this->dbDecodeSerialValue( $db, $row->value ), |
| 473 | self::BLOB_EXPIRY => $this->decodeDbExpiry( $db, $row->exptime ), |
| 474 | self::BLOB_CASTOKEN => $getCasToken |
| 475 | ? $this->getCasTokenFromRow( $db, $row ) |
| 476 | : null |
| 477 | ]; |
| 478 | } catch ( DBQueryError $e ) { |
| 479 | $this->handleDBError( $e, $row->shardIndex ); |
| 480 | } |
| 481 | } |
| 482 | |
| 483 | return $dataByKey; |
| 484 | } |
| 485 | |
| 486 | /** |
| 487 | * @param callable $tableWriteCallback Callback the takes the following arguments: |
| 488 | * - IDatabase instance |
| 489 | * - Partition table name string |
| 490 | * - UNIX modification timestamp |
| 491 | * - Map of (key => list of arguments) for keys belonging to the server/table partition |
| 492 | * - Map of (key => result) [returned] |
| 493 | * @param float $mtime UNIX modification timestamp |
| 494 | * @param array<string,array> $argsByKey Map of (key => list of arguments) |
| 495 | * @param array<string,mixed> &$resByKey Order-preserved map of (key => result) [returned] |
| 496 | * @return bool Whether all keys were processed |
| 497 | * @param-taint $argsByKey none |
| 498 | */ |
| 499 | private function modifyBlobs( |
| 500 | callable $tableWriteCallback, |
| 501 | float $mtime, |
| 502 | array $argsByKey, |
| 503 | &$resByKey = [] |
| 504 | ) { |
| 505 | // Initialize order-preserved per-key results; callbacks mark successful results |
| 506 | $resByKey = array_fill_keys( array_keys( $argsByKey ), false ); |
| 507 | |
| 508 | /** @noinspection PhpUnusedLocalVariableInspection */ |
| 509 | $silenceScope = $this->silenceTransactionProfiler(); |
| 510 | |
| 511 | $argsByKeyByTableByShard = []; |
| 512 | foreach ( $argsByKey as $key => $args ) { |
| 513 | [ $shardIndex, $partitionTable ] = $this->getKeyLocation( $key ); |
| 514 | $argsByKeyByTableByShard[$shardIndex][$partitionTable][$key] = $args; |
| 515 | } |
| 516 | |
| 517 | $shardIndexesAffected = []; |
| 518 | foreach ( $argsByKeyByTableByShard as $shardIndex => $argsByKeyByTables ) { |
| 519 | foreach ( $argsByKeyByTables as $table => $ptKeyArgs ) { |
| 520 | try { |
| 521 | $db = $this->getConnection( $shardIndex ); |
| 522 | $shardIndexesAffected[] = $shardIndex; |
| 523 | $tableWriteCallback( $db, $table, $mtime, $ptKeyArgs, $resByKey ); |
| 524 | } catch ( DBError $e ) { |
| 525 | $this->handleDBError( $e, $shardIndex ); |
| 526 | continue; |
| 527 | } |
| 528 | } |
| 529 | } |
| 530 | |
| 531 | $success = !in_array( false, $resByKey, true ); |
| 532 | |
| 533 | foreach ( $shardIndexesAffected as $shardIndex ) { |
| 534 | try { |
| 535 | if ( |
| 536 | // Random purging is enabled |
| 537 | $this->purgePeriod && |
| 538 | // Only purge on one in every $this->purgePeriod writes |
| 539 | mt_rand( 0, $this->purgePeriod - 1 ) == 0 && |
| 540 | // Avoid repeating the delete within a few seconds |
| 541 | ( $this->getCurrentTime() - $this->lastGarbageCollect ) > self::GC_DELAY_SEC |
| 542 | ) { |
| 543 | $this->garbageCollect( $shardIndex ); |
| 544 | } |
| 545 | } catch ( DBError $e ) { |
| 546 | $this->handleDBError( $e, $shardIndex ); |
| 547 | } |
| 548 | } |
| 549 | |
| 550 | return $success; |
| 551 | } |
| 552 | |
| 553 | /** |
| 554 | * Set key/value pairs belonging to a partition table on the given server |
| 555 | * |
| 556 | * In multi-primary mode, if the current row for a key exists and has a modification token |
| 557 | * with a greater integral UNIX timestamp than that of the provided modification timestamp, |
| 558 | * then the write to that key will be aborted with a "false" result. Successfully modified |
| 559 | * key rows will be assigned a new modification token using the provided timestamp. |
| 560 | * |
| 561 | * @param IDatabase $db Handle to the database server where the argument keys belong |
| 562 | * @param string $ptable Name of the partition table where the argument keys belong |
| 563 | * @param float $mtime UNIX modification timestamp |
| 564 | * @param array<string,array> $argsByKey Non-empty (key => (value,exptime)) map |
| 565 | * @param array<string,mixed> &$resByKey Map of (key => result) for successful writes [returned] |
| 566 | * @throws DBError |
| 567 | */ |
| 568 | private function modifyTableSpecificBlobsForSet( |
| 569 | IDatabase $db, |
| 570 | string $ptable, |
| 571 | float $mtime, |
| 572 | array $argsByKey, |
| 573 | array &$resByKey |
| 574 | ) { |
| 575 | $valueSizesByKey = []; |
| 576 | |
| 577 | $mt = $this->makeTimestampedModificationToken( $mtime, $db ); |
| 578 | |
| 579 | $rows = []; |
| 580 | foreach ( $argsByKey as $key => [ $value, $exptime ] ) { |
| 581 | $expiry = $this->makeNewKeyExpiry( $exptime, (int)$mtime ); |
| 582 | $serialValue = $this->getSerialized( $value, $key ); |
| 583 | $rows[] = $this->buildUpsertRow( $db, $key, $serialValue, $expiry, $mt ); |
| 584 | |
| 585 | $valueSizesByKey[$key] = [ strlen( $serialValue ), 0 ]; |
| 586 | } |
| 587 | |
| 588 | if ( $this->multiPrimaryMode ) { |
| 589 | $db->newInsertQueryBuilder() |
| 590 | ->insertInto( $ptable ) |
| 591 | ->rows( $rows ) |
| 592 | ->onDuplicateKeyUpdate() |
| 593 | ->uniqueIndexFields( [ 'keyname' ] ) |
| 594 | ->set( $this->buildMultiUpsertSetForOverwrite( $db, $mt ) ) |
| 595 | ->caller( __METHOD__ )->execute(); |
| 596 | } else { |
| 597 | // T288998: use REPLACE, if possible, to avoid cluttering the binlogs |
| 598 | $db->newReplaceQueryBuilder() |
| 599 | ->replaceInto( $ptable ) |
| 600 | ->rows( $rows ) |
| 601 | ->uniqueIndexFields( [ 'keyname' ] ) |
| 602 | ->caller( __METHOD__ )->execute(); |
| 603 | } |
| 604 | |
| 605 | foreach ( $argsByKey as $key => $unused ) { |
| 606 | $resByKey[$key] = true; |
| 607 | } |
| 608 | |
| 609 | $this->updateOpStats( self::METRIC_OP_SET, $valueSizesByKey ); |
| 610 | } |
| 611 | |
| 612 | /** |
| 613 | * Purge/tombstone key/value pairs belonging to a partition table on the given server |
| 614 | * |
| 615 | * In multi-primary mode, if the current row for a key exists and has a modification token |
| 616 | * with a greater integral UNIX timestamp than that of the provided modification timestamp, |
| 617 | * then the write to that key will be aborted with a "false" result. Successfully modified |
| 618 | * key rows will be assigned a new modification token/timestamp, an empty value, and an |
| 619 | * expiration timestamp dated slightly before the new modification timestamp. |
| 620 | * |
| 621 | * @param IDatabase $db Handle to the database server where the argument keys belong |
| 622 | * @param string $ptable Name of the partition table where the argument keys belong |
| 623 | * @param float $mtime UNIX modification timestamp |
| 624 | * @param array<string,array> $argsByKey Non-empty (key => []) map |
| 625 | * @param array<string,mixed> &$resByKey Map of (key => result) prefilled with false [returned] |
| 626 | * @throws DBError |
| 627 | */ |
| 628 | private function modifyTableSpecificBlobsForDelete( |
| 629 | IDatabase $db, |
| 630 | string $ptable, |
| 631 | float $mtime, |
| 632 | array $argsByKey, |
| 633 | array &$resByKey |
| 634 | ) { |
| 635 | if ( $this->multiPrimaryMode ) { |
| 636 | // Tombstone keys in order to respect eventual consistency |
| 637 | $mt = $this->makeTimestampedModificationToken( $mtime, $db ); |
| 638 | $expiry = $this->makeNewKeyExpiry( self::TOMB_EXPTIME, (int)$mtime ); |
| 639 | $queryBuilder = $db->newInsertQueryBuilder() |
| 640 | ->insertInto( $ptable ) |
| 641 | ->onDuplicateKeyUpdate() |
| 642 | ->uniqueIndexFields( [ 'keyname' ] ) |
| 643 | ->set( $this->buildMultiUpsertSetForOverwrite( $db, $mt ) ); |
| 644 | foreach ( $argsByKey as $key => $arg ) { |
| 645 | $queryBuilder->row( $this->buildUpsertRow( $db, $key, self::TOMB_SERIAL, $expiry, $mt ) ); |
| 646 | } |
| 647 | $queryBuilder->caller( __METHOD__ )->execute(); |
| 648 | } else { |
| 649 | // Just purge the keys since there is only one primary (e.g. "source of truth") |
| 650 | $db->newDeleteQueryBuilder() |
| 651 | ->deleteFrom( $ptable ) |
| 652 | ->where( [ 'keyname' => array_keys( $argsByKey ) ] ) |
| 653 | ->caller( __METHOD__ )->execute(); |
| 654 | } |
| 655 | |
| 656 | foreach ( $argsByKey as $key => $arg ) { |
| 657 | $resByKey[$key] = true; |
| 658 | } |
| 659 | |
| 660 | $this->updateOpStats( self::METRIC_OP_DELETE, array_keys( $argsByKey ) ); |
| 661 | } |
| 662 | |
| 663 | /** |
| 664 | * Insert key/value pairs belonging to a partition table on the given server |
| 665 | * |
| 666 | * If the current row for a key exists and has an integral UNIX timestamp of expiration |
| 667 | * greater than that of the provided modification timestamp, then the write to that key |
| 668 | * will be aborted with a "false" result. Acquisition of advisory key locks must be handled |
| 669 | * by calling functions. |
| 670 | * |
| 671 | * In multi-primary mode, if the current row for a key exists and has a modification token |
| 672 | * with a greater integral UNIX timestamp than that of the provided modification timestamp, |
| 673 | * then the write to that key will be aborted with a "false" result. Successfully modified |
| 674 | * key rows will be assigned a new modification token/timestamp. |
| 675 | * |
| 676 | * @param IDatabase $db Handle to the database server where the argument keys belong |
| 677 | * @param string $ptable Name of the partition table where the argument keys belong |
| 678 | * @param float $mtime UNIX modification timestamp |
| 679 | * @param array<string,array> $argsByKey Non-empty (key => (value,exptime)) map |
| 680 | * @param array<string,mixed> &$resByKey Map of (key => result) prefilled with false [returned] |
| 681 | * @throws DBError |
| 682 | */ |
| 683 | private function modifyTableSpecificBlobsForAdd( |
| 684 | IDatabase $db, |
| 685 | string $ptable, |
| 686 | float $mtime, |
| 687 | array $argsByKey, |
| 688 | array &$resByKey |
| 689 | ) { |
| 690 | $valueSizesByKey = []; |
| 691 | |
| 692 | $mt = $this->makeTimestampedModificationToken( $mtime, $db ); |
| 693 | |
| 694 | // This check must happen outside the write query to respect eventual consistency |
| 695 | $existingKeys = $db->newSelectQueryBuilder() |
| 696 | ->select( 'keyname' ) |
| 697 | ->from( $ptable ) |
| 698 | ->where( $this->buildExistenceConditions( $db, array_keys( $argsByKey ), (int)$mtime ) ) |
| 699 | ->caller( __METHOD__ ) |
| 700 | ->fetchFieldValues(); |
| 701 | $existingByKey = array_fill_keys( $existingKeys, true ); |
| 702 | |
| 703 | $rows = []; |
| 704 | foreach ( $argsByKey as $key => [ $value, $exptime ] ) { |
| 705 | if ( isset( $existingByKey[$key] ) ) { |
| 706 | $this->logger->debug( __METHOD__ . ": $key already exists" ); |
| 707 | continue; |
| 708 | } |
| 709 | |
| 710 | $serialValue = $this->getSerialized( $value, $key ); |
| 711 | $expiry = $this->makeNewKeyExpiry( $exptime, (int)$mtime ); |
| 712 | $valueSizesByKey[$key] = [ strlen( $serialValue ), 0 ]; |
| 713 | $rows[] = $this->buildUpsertRow( $db, $key, $serialValue, $expiry, $mt ); |
| 714 | } |
| 715 | if ( !$rows ) { |
| 716 | return; |
| 717 | } |
| 718 | $db->newInsertQueryBuilder() |
| 719 | ->insertInto( $ptable ) |
| 720 | ->rows( $rows ) |
| 721 | ->onDuplicateKeyUpdate() |
| 722 | ->uniqueIndexFields( [ 'keyname' ] ) |
| 723 | ->set( $this->buildMultiUpsertSetForOverwrite( $db, $mt ) ) |
| 724 | ->caller( __METHOD__ )->execute(); |
| 725 | |
| 726 | foreach ( $argsByKey as $key => $unused ) { |
| 727 | $resByKey[$key] = !isset( $existingByKey[$key] ); |
| 728 | } |
| 729 | |
| 730 | $this->updateOpStats( self::METRIC_OP_ADD, $valueSizesByKey ); |
| 731 | } |
| 732 | |
| 733 | /** |
| 734 | * Insert key/value pairs belonging to a partition table on the given server |
| 735 | * |
| 736 | * If the current row for a key exists, has an integral UNIX timestamp of expiration greater |
| 737 | * than that of the provided modification timestamp, and the CAS token does not match, then |
| 738 | * the write to that key will be aborted with a "false" result. Acquisition of advisory key |
| 739 | * locks must be handled by calling functions. |
| 740 | * |
| 741 | * In multi-primary mode, if the current row for a key exists and has a modification token |
| 742 | * with a greater integral UNIX timestamp than that of the provided modification timestamp, |
| 743 | * then the write to that key will be aborted with a "false" result. Successfully modified |
| 744 | * key rows will be assigned a new modification token/timestamp. |
| 745 | * |
| 746 | * @param IDatabase $db Handle to the database server where the argument keys belong |
| 747 | * @param string $ptable Name of the partition table where the argument keys belong |
| 748 | * @param float $mtime UNIX modification timestamp |
| 749 | * @param array<string,array> $argsByKey Non-empty (key => (value, exptime, CAS token)) map |
| 750 | * @param array<string,mixed> &$resByKey Map of (key => result) prefilled with false [returned] |
| 751 | * @throws DBError |
| 752 | */ |
| 753 | private function modifyTableSpecificBlobsForCas( |
| 754 | IDatabase $db, |
| 755 | string $ptable, |
| 756 | float $mtime, |
| 757 | array $argsByKey, |
| 758 | array &$resByKey |
| 759 | ) { |
| 760 | $valueSizesByKey = []; |
| 761 | |
| 762 | $mt = $this->makeTimestampedModificationToken( $mtime, $db ); |
| 763 | |
| 764 | // This check must happen outside the write query to respect eventual consistency |
| 765 | $res = $db->newSelectQueryBuilder() |
| 766 | ->select( $this->addCasTokenFields( $db, [ 'keyname' ] ) ) |
| 767 | ->from( $ptable ) |
| 768 | ->where( $this->buildExistenceConditions( $db, array_keys( $argsByKey ), (int)$mtime ) ) |
| 769 | ->caller( __METHOD__ ) |
| 770 | ->fetchResultSet(); |
| 771 | |
| 772 | $curTokensByKey = []; |
| 773 | foreach ( $res as $row ) { |
| 774 | $curTokensByKey[$row->keyname] = $this->getCasTokenFromRow( $db, $row ); |
| 775 | } |
| 776 | |
| 777 | $nonMatchingByKey = []; |
| 778 | $rows = []; |
| 779 | foreach ( $argsByKey as $key => [ $value, $exptime, $casToken ] ) { |
| 780 | $curToken = $curTokensByKey[$key] ?? null; |
| 781 | if ( $curToken === null ) { |
| 782 | $nonMatchingByKey[$key] = true; |
| 783 | $this->logger->debug( __METHOD__ . ": $key does not exists" ); |
| 784 | continue; |
| 785 | } |
| 786 | |
| 787 | if ( $curToken !== $casToken ) { |
| 788 | $nonMatchingByKey[$key] = true; |
| 789 | $this->logger->debug( __METHOD__ . ": $key does not have a matching token" ); |
| 790 | continue; |
| 791 | } |
| 792 | |
| 793 | $serialValue = $this->getSerialized( $value, $key ); |
| 794 | $expiry = $this->makeNewKeyExpiry( $exptime, (int)$mtime ); |
| 795 | $valueSizesByKey[$key] = [ strlen( $serialValue ), 0 ]; |
| 796 | |
| 797 | $rows[] = $this->buildUpsertRow( $db, $key, $serialValue, $expiry, $mt ); |
| 798 | } |
| 799 | if ( !$rows ) { |
| 800 | return; |
| 801 | } |
| 802 | $db->newInsertQueryBuilder() |
| 803 | ->insertInto( $ptable ) |
| 804 | ->rows( $rows ) |
| 805 | ->onDuplicateKeyUpdate() |
| 806 | ->uniqueIndexFields( [ 'keyname' ] ) |
| 807 | ->set( $this->buildMultiUpsertSetForOverwrite( $db, $mt ) ) |
| 808 | ->caller( __METHOD__ )->execute(); |
| 809 | |
| 810 | foreach ( $argsByKey as $key => $unused ) { |
| 811 | $resByKey[$key] = !isset( $nonMatchingByKey[$key] ); |
| 812 | } |
| 813 | |
| 814 | $this->updateOpStats( self::METRIC_OP_CAS, $valueSizesByKey ); |
| 815 | } |
| 816 | |
| 817 | /** |
| 818 | * Update the TTL for keys belonging to a partition table on the given server |
| 819 | * |
| 820 | * If no current row for a key exists or the current row has an integral UNIX timestamp of |
| 821 | * expiration less than that of the provided modification timestamp, then the write to that |
| 822 | * key will be aborted with a "false" result. |
| 823 | * |
| 824 | * In multi-primary mode, if the current row for a key exists and has a modification token |
| 825 | * with a greater integral UNIX timestamp than that of the provided modification timestamp, |
| 826 | * then the write to that key will be aborted with a "false" result. Successfully modified |
| 827 | * key rows will be assigned a new modification token/timestamp. |
| 828 | * |
| 829 | * @param IDatabase $db Handle to the database server where the argument keys belong |
| 830 | * @param string $ptable Name of the partition table where the argument keys belong |
| 831 | * @param float $mtime UNIX modification timestamp |
| 832 | * @param array<string,array> $argsByKey Non-empty (key => (exptime)) map |
| 833 | * @param array<string,mixed> &$resByKey Map of (key => result) prefilled with false [returned] |
| 834 | * @throws DBError |
| 835 | */ |
| 836 | private function modifyTableSpecificBlobsForChangeTTL( |
| 837 | IDatabase $db, |
| 838 | string $ptable, |
| 839 | float $mtime, |
| 840 | array $argsByKey, |
| 841 | array &$resByKey |
| 842 | ) { |
| 843 | if ( $this->multiPrimaryMode ) { |
| 844 | $mt = $this->makeTimestampedModificationToken( $mtime, $db ); |
| 845 | |
| 846 | $res = $db->newSelectQueryBuilder() |
| 847 | ->select( [ 'keyname', 'value' ] ) |
| 848 | ->from( $ptable ) |
| 849 | ->where( $this->buildExistenceConditions( $db, array_keys( $argsByKey ), (int)$mtime ) ) |
| 850 | ->caller( __METHOD__ ) |
| 851 | ->fetchResultSet(); |
| 852 | |
| 853 | $rows = []; |
| 854 | $existingKeys = []; |
| 855 | foreach ( $res as $curRow ) { |
| 856 | $key = $curRow->keyname; |
| 857 | $existingKeys[$key] = true; |
| 858 | $serialValue = $this->dbDecodeSerialValue( $db, $curRow->value ); |
| 859 | [ $exptime ] = $argsByKey[$key]; |
| 860 | $expiry = $this->makeNewKeyExpiry( $exptime, (int)$mtime ); |
| 861 | $rows[] = $this->buildUpsertRow( $db, $key, $serialValue, $expiry, $mt ); |
| 862 | } |
| 863 | if ( !$rows ) { |
| 864 | return; |
| 865 | } |
| 866 | $db->newInsertQueryBuilder() |
| 867 | ->insertInto( $ptable ) |
| 868 | ->rows( $rows ) |
| 869 | ->onDuplicateKeyUpdate() |
| 870 | ->uniqueIndexFields( [ 'keyname' ] ) |
| 871 | ->set( $this->buildMultiUpsertSetForOverwrite( $db, $mt ) ) |
| 872 | ->caller( __METHOD__ )->execute(); |
| 873 | |
| 874 | foreach ( $argsByKey as $key => $unused ) { |
| 875 | $resByKey[$key] = isset( $existingKeys[$key] ); |
| 876 | } |
| 877 | } else { |
| 878 | $keysBatchesByExpiry = []; |
| 879 | foreach ( $argsByKey as $key => [ $exptime ] ) { |
| 880 | $expiry = $this->makeNewKeyExpiry( $exptime, (int)$mtime ); |
| 881 | $keysBatchesByExpiry[$expiry][] = $key; |
| 882 | } |
| 883 | |
| 884 | $existingCount = 0; |
| 885 | foreach ( $keysBatchesByExpiry as $expiry => $keyBatch ) { |
| 886 | $db->newUpdateQueryBuilder() |
| 887 | ->update( $ptable ) |
| 888 | ->set( [ 'exptime' => $this->encodeDbExpiry( $db, $expiry ) ] ) |
| 889 | ->where( $this->buildExistenceConditions( $db, $keyBatch, (int)$mtime ) ) |
| 890 | ->caller( __METHOD__ )->execute(); |
| 891 | $existingCount += $db->affectedRows(); |
| 892 | } |
| 893 | if ( $existingCount === count( $argsByKey ) ) { |
| 894 | foreach ( $argsByKey as $key => $args ) { |
| 895 | $resByKey[$key] = true; |
| 896 | } |
| 897 | } |
| 898 | } |
| 899 | |
| 900 | $this->updateOpStats( self::METRIC_OP_CHANGE_TTL, array_keys( $argsByKey ) ); |
| 901 | } |
| 902 | |
| 903 | /** |
| 904 | * Either increment a counter key, if it exists, or initialize it, otherwise |
| 905 | * |
| 906 | * If no current row for a key exists or the current row has an integral UNIX timestamp of |
| 907 | * expiration less than that of the provided modification timestamp, then the key row will |
| 908 | * be set to the initial value. Otherwise, the current row will be incremented. |
| 909 | * |
| 910 | * In multi-primary mode, if the current row for a key exists and has a modification token |
| 911 | * with a greater integral UNIX timestamp than that of the provided modification timestamp, |
| 912 | * then the write to that key will be aborted with a "false" result. Successfully initialized |
| 913 | * key rows will be assigned a new modification token/timestamp. |
| 914 | * |
| 915 | * @param IDatabase $db Handle to the database server where the argument keys belong |
| 916 | * @param string $ptable Name of the partition table where the argument keys belong |
| 917 | * @param float $mtime UNIX modification timestamp |
| 918 | * @param array<string,array> $argsByKey Non-empty (key => (step, init, exptime) map |
| 919 | * @param array<string,mixed> &$resByKey Map of (key => result) prefilled with false [returned] |
| 920 | * @throws DBError |
| 921 | */ |
| 922 | private function modifyTableSpecificBlobsForIncrInit( |
| 923 | IDatabase $db, |
| 924 | string $ptable, |
| 925 | float $mtime, |
| 926 | array $argsByKey, |
| 927 | array &$resByKey |
| 928 | ) { |
| 929 | foreach ( $argsByKey as $key => [ $step, $init, $exptime ] ) { |
| 930 | $mt = $this->makeTimestampedModificationToken( $mtime, $db ); |
| 931 | $expiry = $this->makeNewKeyExpiry( $exptime, (int)$mtime ); |
| 932 | |
| 933 | // Use a transaction so that changes from other threads are not visible due to |
| 934 | // "consistent reads". This way, the exact post-increment value can be returned. |
| 935 | // The "live key exists" check can go inside the write query and remain safe for |
| 936 | // replication since the TTL for such keys is either indefinite or very short. |
| 937 | $atomic = $db->startAtomic( __METHOD__, IDatabase::ATOMIC_CANCELABLE ); |
| 938 | try { |
| 939 | $db->newInsertQueryBuilder() |
| 940 | ->insertInto( $ptable ) |
| 941 | ->rows( $this->buildUpsertRow( $db, $key, $init, $expiry, $mt ) ) |
| 942 | ->onDuplicateKeyUpdate() |
| 943 | ->uniqueIndexFields( [ 'keyname' ] ) |
| 944 | ->set( $this->buildIncrUpsertSet( $db, $step, $init, $expiry, $mt, (int)$mtime ) ) |
| 945 | ->caller( __METHOD__ )->execute(); |
| 946 | $affectedCount = $db->affectedRows(); |
| 947 | $row = $db->newSelectQueryBuilder() |
| 948 | ->select( 'value' ) |
| 949 | ->from( $ptable ) |
| 950 | ->where( [ 'keyname' => $key ] ) |
| 951 | ->caller( __METHOD__ ) |
| 952 | ->fetchRow(); |
| 953 | } catch ( Exception $e ) { |
| 954 | $db->cancelAtomic( __METHOD__, $atomic ); |
| 955 | throw $e; |
| 956 | } |
| 957 | $db->endAtomic( __METHOD__ ); |
| 958 | |
| 959 | if ( !$affectedCount || $row === false ) { |
| 960 | $this->logger->warning( __METHOD__ . ": failed to set new $key value" ); |
| 961 | continue; |
| 962 | } |
| 963 | |
| 964 | $serialValue = $this->dbDecodeSerialValue( $db, $row->value ); |
| 965 | if ( !$this->isInteger( $serialValue ) ) { |
| 966 | $this->logger->warning( __METHOD__ . ": got non-integer $key value" ); |
| 967 | continue; |
| 968 | } |
| 969 | |
| 970 | $resByKey[$key] = (int)$serialValue; |
| 971 | } |
| 972 | |
| 973 | $this->updateOpStats( self::METRIC_OP_INCR, array_keys( $argsByKey ) ); |
| 974 | } |
| 975 | |
| 976 | /** |
| 977 | * Same as modifyTableSpecificBlobsForIncrInit() but does not return the |
| 978 | * new value. |
| 979 | * |
| 980 | * @param IDatabase $db |
| 981 | * @param string $ptable |
| 982 | * @param float $mtime |
| 983 | * @param array<string,array> $argsByKey |
| 984 | * @param array<string,mixed> &$resByKey |
| 985 | * @throws DBError |
| 986 | */ |
| 987 | private function modifyTableSpecificBlobsForIncrInitAsync( |
| 988 | IDatabase $db, |
| 989 | string $ptable, |
| 990 | float $mtime, |
| 991 | array $argsByKey, |
| 992 | array &$resByKey |
| 993 | ) { |
| 994 | foreach ( $argsByKey as $key => [ $step, $init, $exptime ] ) { |
| 995 | $mt = $this->makeTimestampedModificationToken( $mtime, $db ); |
| 996 | $expiry = $this->makeNewKeyExpiry( $exptime, (int)$mtime ); |
| 997 | $db->newInsertQueryBuilder() |
| 998 | ->insertInto( $ptable ) |
| 999 | ->rows( $this->buildUpsertRow( $db, $key, $init, $expiry, $mt ) ) |
| 1000 | ->onDuplicateKeyUpdate() |
| 1001 | ->uniqueIndexFields( [ 'keyname' ] ) |
| 1002 | ->set( $this->buildIncrUpsertSet( $db, $step, $init, $expiry, $mt, (int)$mtime ) ) |
| 1003 | ->caller( __METHOD__ )->execute(); |
| 1004 | if ( !$db->affectedRows() ) { |
| 1005 | $this->logger->warning( __METHOD__ . ": failed to set new $key value" ); |
| 1006 | } else { |
| 1007 | $resByKey[$key] = true; |
| 1008 | } |
| 1009 | } |
| 1010 | } |
| 1011 | |
| 1012 | /** |
| 1013 | * @param int $exptime Relative or absolute expiration |
| 1014 | * @param int $nowTsUnix Current UNIX timestamp |
| 1015 | * @return int UNIX timestamp or TTL_INDEFINITE |
| 1016 | */ |
| 1017 | private function makeNewKeyExpiry( $exptime, int $nowTsUnix ) { |
| 1018 | $expiry = $this->getExpirationAsTimestamp( $exptime ); |
| 1019 | // Eventual consistency requires the preservation of recently modified keys. |
| 1020 | // Do not create rows with `exptime` fields so low that they might get garbage |
| 1021 | // collected before being replicated. |
| 1022 | if ( $expiry !== self::TTL_INDEFINITE ) { |
| 1023 | $expiry = max( $expiry, $nowTsUnix - self::SAFE_CLOCK_BOUND_SEC ); |
| 1024 | } |
| 1025 | |
| 1026 | return $expiry; |
| 1027 | } |
| 1028 | |
| 1029 | /** |
| 1030 | * Get a scoped lock and modification timestamp for a critical section of reads/writes |
| 1031 | * |
| 1032 | * This is used instead of BagOStuff::getCurrentTime() for certain writes (such as "add", |
| 1033 | * "incr", and "cas"), for which we want to support tight race conditions where the same |
| 1034 | * key is repeatedly written to by multiple web servers that each get to see the previous |
| 1035 | * value, act on it, and modify it in some way. |
| 1036 | * |
| 1037 | * It is assumed that this method is normally only invoked from the primary datacenter. |
| 1038 | * A lock is acquired on the primary server of the local datacenter in order to avoid race |
| 1039 | * conditions within the critical section. The clock on the SQL server is used to get the |
| 1040 | * modification timestamp in order to minimize issues with clock drift between web servers; |
| 1041 | * thus key writes will not be rejected due to some web servers having lagged clocks. |
| 1042 | * |
| 1043 | * @param string $key |
| 1044 | * @param ?ScopedCallback &$scope Unlocker callback; null on failure [returned] |
| 1045 | * @return float|null UNIX timestamp with 6 decimal places; null on failure |
| 1046 | */ |
| 1047 | private function newLockingWriteSectionModificationTimestamp( $key, &$scope ) { |
| 1048 | if ( !$this->lock( $key, 0 ) ) { |
| 1049 | return null; |
| 1050 | } |
| 1051 | |
| 1052 | $scope = new ScopedCallback( function () use ( $key ) { |
| 1053 | $this->unlock( $key ); |
| 1054 | } ); |
| 1055 | |
| 1056 | // sprintf is used to adjust precision |
| 1057 | return (float)sprintf( '%.6F', $this->locks[$key][self::LOCK_TIME] ); |
| 1058 | } |
| 1059 | |
| 1060 | /** |
| 1061 | * Make a `modtoken` column value with the original time and source database server of a write |
| 1062 | * |
| 1063 | * @param float $mtime UNIX modification timestamp |
| 1064 | * @param IDatabase $db Handle to the primary database server sourcing the write |
| 1065 | * @return string String of the form "<SECONDS_SOURCE><MICROSECONDS>", where SECONDS_SOURCE |
| 1066 | * is "<35 bit seconds portion of UNIX time><32 bit database server ID>" as 13 base 36 chars, |
| 1067 | * and MICROSECONDS is "<20 bit microseconds portion of UNIX time>" as 4 base 36 chars |
| 1068 | */ |
| 1069 | private function makeTimestampedModificationToken( float $mtime, IDatabase $db ) { |
| 1070 | // We have reserved space for upto 6 digits in the microsecond portion of the token. |
| 1071 | // This is for future use only (maybe CAS tokens) and not currently used. |
| 1072 | // It is currently populated by the microsecond portion returned by microtime, |
| 1073 | // which generally has fewer than 6 digits of meaningful precision but can still be useful |
| 1074 | // in debugging (to see the token continuously change even during rapid testing). |
| 1075 | $seconds = (int)$mtime; |
| 1076 | [ , $microseconds ] = explode( '.', sprintf( '%.6F', $mtime ) ); |
| 1077 | |
| 1078 | $id = $db->getTopologyBasedServerId() ?? sprintf( '%u', crc32( $db->getServerName() ) ); |
| 1079 | |
| 1080 | $token = implode( '', [ |
| 1081 | // 67 bit integral portion of UNIX timestamp, qualified |
| 1082 | \Wikimedia\base_convert( |
| 1083 | // 35 bit integral seconds portion of UNIX timestamp |
| 1084 | str_pad( base_convert( (string)$seconds, 10, 2 ), 35, '0', STR_PAD_LEFT ) . |
| 1085 | // 32 bit ID of the primary database server handling the write |
| 1086 | str_pad( base_convert( $id, 10, 2 ), 32, '0', STR_PAD_LEFT ), |
| 1087 | 2, |
| 1088 | 36, |
| 1089 | 13 |
| 1090 | ), |
| 1091 | // 20 bit fractional portion of UNIX timestamp, as integral microseconds |
| 1092 | str_pad( base_convert( $microseconds, 10, 36 ), 4, '0', STR_PAD_LEFT ) |
| 1093 | ] ); |
| 1094 | |
| 1095 | if ( strlen( $token ) !== 17 ) { |
| 1096 | throw new RuntimeException( "Modification timestamp overflow detected" ); |
| 1097 | } |
| 1098 | |
| 1099 | return $token; |
| 1100 | } |
| 1101 | |
| 1102 | /** |
| 1103 | * WHERE conditions that check for existence and liveness of keys |
| 1104 | * |
| 1105 | * @param IDatabase $db |
| 1106 | * @param string[]|string $keys |
| 1107 | * @param int $time UNIX modification timestamp |
| 1108 | * @return array |
| 1109 | */ |
| 1110 | private function buildExistenceConditions( IDatabase $db, $keys, int $time ) { |
| 1111 | // Note that tombstones always have past expiration dates |
| 1112 | return [ |
| 1113 | 'keyname' => $keys, |
| 1114 | $db->expr( 'exptime', '>=', $db->timestamp( $time ) ) |
| 1115 | ]; |
| 1116 | } |
| 1117 | |
| 1118 | /** |
| 1119 | * INSERT array for handling key writes/overwrites when no live nor stale key exists |
| 1120 | * |
| 1121 | * @param IDatabase $db |
| 1122 | * @param string $key |
| 1123 | * @param string|int $serialValue New value |
| 1124 | * @param int $expiry Expiration timestamp or TTL_INDEFINITE |
| 1125 | * @param string $mt Modification token |
| 1126 | * @return array |
| 1127 | */ |
| 1128 | private function buildUpsertRow( |
| 1129 | IDatabase $db, |
| 1130 | $key, |
| 1131 | $serialValue, |
| 1132 | int $expiry, |
| 1133 | string $mt |
| 1134 | ) { |
| 1135 | $row = [ |
| 1136 | 'keyname' => $key, |
| 1137 | 'value' => $this->dbEncodeSerialValue( $db, $serialValue ), |
| 1138 | 'exptime' => $this->encodeDbExpiry( $db, $expiry ) |
| 1139 | ]; |
| 1140 | if ( $this->multiPrimaryMode ) { |
| 1141 | $row['modtoken'] = $mt; |
| 1142 | } |
| 1143 | |
| 1144 | return $row; |
| 1145 | } |
| 1146 | |
| 1147 | /** |
| 1148 | * SET array for handling key overwrites when a live or stale key exists |
| 1149 | * |
| 1150 | * @param IDatabase $db |
| 1151 | * @param string $mt Modification token |
| 1152 | * @return array |
| 1153 | */ |
| 1154 | private function buildMultiUpsertSetForOverwrite( IDatabase $db, string $mt ) { |
| 1155 | $expressionsByColumn = [ |
| 1156 | 'value' => $db->buildExcludedValue( 'value' ), |
| 1157 | 'exptime' => $db->buildExcludedValue( 'exptime' ) |
| 1158 | ]; |
| 1159 | |
| 1160 | $set = []; |
| 1161 | if ( $this->multiPrimaryMode ) { |
| 1162 | // The query might take a while to replicate, during which newer values might get |
| 1163 | // written. Qualify the query so that it does not override such values. Note that |
| 1164 | // duplicate tokens generated around the same time for a key should still result |
| 1165 | // in convergence given the use of server_id in modtoken (providing a total order |
| 1166 | // among primary DB servers) and MySQL binlog ordering (providing a total order |
| 1167 | // for writes replicating from a given primary DB server). |
| 1168 | $expressionsByColumn['modtoken'] = $db->addQuotes( $mt ); |
| 1169 | foreach ( $expressionsByColumn as $column => $updateExpression ) { |
| 1170 | $rhs = $db->conditional( |
| 1171 | $db->addQuotes( substr( $mt, 0, 13 ) ) . ' >= ' . |
| 1172 | $db->buildSubString( 'modtoken', 1, 13 ), |
| 1173 | $updateExpression, |
| 1174 | $column |
| 1175 | ); |
| 1176 | $set[] = "{$column}=" . trim( $rhs ); |
| 1177 | } |
| 1178 | } else { |
| 1179 | foreach ( $expressionsByColumn as $column => $updateExpression ) { |
| 1180 | $set[] = "{$column}={$updateExpression}"; |
| 1181 | } |
| 1182 | } |
| 1183 | |
| 1184 | return $set; |
| 1185 | } |
| 1186 | |
| 1187 | /** |
| 1188 | * SET array for handling key overwrites when a live or stale key exists |
| 1189 | * |
| 1190 | * @param IDatabase $db |
| 1191 | * @param int $step Positive counter incrementation value |
| 1192 | * @param int $init Positive initial counter value |
| 1193 | * @param int $expiry Expiration timestamp or TTL_INDEFINITE |
| 1194 | * @param string $mt Modification token |
| 1195 | * @param int $mtUnixTs UNIX timestamp of modification token |
| 1196 | * @return array |
| 1197 | */ |
| 1198 | private function buildIncrUpsertSet( |
| 1199 | IDatabase $db, |
| 1200 | int $step, |
| 1201 | int $init, |
| 1202 | int $expiry, |
| 1203 | string $mt, |
| 1204 | int $mtUnixTs |
| 1205 | ) { |
| 1206 | // Map of (column => (SQL for non-expired key rows, SQL for expired key rows)) |
| 1207 | $expressionsByColumn = [ |
| 1208 | 'value' => [ |
| 1209 | $db->buildIntegerCast( 'value' ) . " + {$db->addQuotes( $step )}", |
| 1210 | $db->addQuotes( $this->dbEncodeSerialValue( $db, $init ) ) |
| 1211 | ], |
| 1212 | 'exptime' => [ |
| 1213 | 'exptime', |
| 1214 | $db->addQuotes( $this->encodeDbExpiry( $db, $expiry ) ) |
| 1215 | ] |
| 1216 | ]; |
| 1217 | if ( $this->multiPrimaryMode ) { |
| 1218 | $expressionsByColumn['modtoken'] = [ 'modtoken', $db->addQuotes( $mt ) ]; |
| 1219 | } |
| 1220 | |
| 1221 | $set = []; |
| 1222 | foreach ( $expressionsByColumn as $column => [ $updateExpression, $initExpression ] ) { |
| 1223 | $rhs = $db->conditional( |
| 1224 | $db->expr( 'exptime', '>=', $db->timestamp( $mtUnixTs ) ), |
| 1225 | $updateExpression, |
| 1226 | $initExpression |
| 1227 | ); |
| 1228 | $set[] = "{$column}=" . trim( $rhs ); |
| 1229 | } |
| 1230 | |
| 1231 | return $set; |
| 1232 | } |
| 1233 | |
| 1234 | /** |
| 1235 | * @param IDatabase $db |
| 1236 | * @param int $expiry UNIX timestamp of expiration or TTL_INDEFINITE |
| 1237 | * @return string |
| 1238 | */ |
| 1239 | private function encodeDbExpiry( IDatabase $db, int $expiry ) { |
| 1240 | return ( $expiry === self::TTL_INDEFINITE ) |
| 1241 | // Use the maximum timestamp that the column can store |
| 1242 | ? $db->timestamp( self::INF_TIMESTAMP_PLACEHOLDER ) |
| 1243 | // Convert the absolute timestamp into the DB timestamp format |
| 1244 | : $db->timestamp( $expiry ); |
| 1245 | } |
| 1246 | |
| 1247 | /** |
| 1248 | * @param IDatabase $db |
| 1249 | * @param string $dbExpiry DB timestamp of expiration |
| 1250 | * @return int UNIX timestamp of expiration or TTL_INDEFINITE |
| 1251 | */ |
| 1252 | private function decodeDbExpiry( IDatabase $db, string $dbExpiry ) { |
| 1253 | return ( $dbExpiry === $db->timestamp( self::INF_TIMESTAMP_PLACEHOLDER ) ) |
| 1254 | ? self::TTL_INDEFINITE |
| 1255 | : (int)ConvertibleTimestamp::convert( TS_UNIX, $dbExpiry ); |
| 1256 | } |
| 1257 | |
| 1258 | /** |
| 1259 | * @param IDatabase $db |
| 1260 | * @param string|int $serialValue |
| 1261 | * @return string |
| 1262 | */ |
| 1263 | private function dbEncodeSerialValue( IDatabase $db, $serialValue ) { |
| 1264 | return is_int( $serialValue ) ? (string)$serialValue : $db->encodeBlob( $serialValue ); |
| 1265 | } |
| 1266 | |
| 1267 | /** |
| 1268 | * @param IDatabase $db |
| 1269 | * @param Blob|string|int $blob |
| 1270 | * @return string|int |
| 1271 | */ |
| 1272 | private function dbDecodeSerialValue( IDatabase $db, $blob ) { |
| 1273 | return $this->isInteger( $blob ) ? (int)$blob : $db->decodeBlob( $blob ); |
| 1274 | } |
| 1275 | |
| 1276 | /** |
| 1277 | * Either append a 'castoken' field or append the fields needed to compute the CAS token |
| 1278 | * |
| 1279 | * @param IDatabase $db |
| 1280 | * @param string[] $fields SELECT field array |
| 1281 | * @return string[] SELECT field array |
| 1282 | */ |
| 1283 | private function addCasTokenFields( IDatabase $db, array $fields ) { |
| 1284 | $type = $db->getType(); |
| 1285 | |
| 1286 | if ( $type === 'mysql' ) { |
| 1287 | $fields['castoken'] = $db->buildConcat( [ |
| 1288 | 'SHA1(value)', |
| 1289 | $db->addQuotes( '@' ), |
| 1290 | 'exptime' |
| 1291 | ] ); |
| 1292 | } elseif ( $type === 'postgres' ) { |
| 1293 | $fields['castoken'] = $db->buildConcat( [ |
| 1294 | 'md5(value)', |
| 1295 | $db->addQuotes( '@' ), |
| 1296 | 'exptime' |
| 1297 | ] ); |
| 1298 | } else { |
| 1299 | if ( !in_array( 'value', $fields, true ) ) { |
| 1300 | $fields[] = 'value'; |
| 1301 | } |
| 1302 | if ( !in_array( 'exptime', $fields, true ) ) { |
| 1303 | $fields[] = 'exptime'; |
| 1304 | } |
| 1305 | } |
| 1306 | |
| 1307 | return $fields; |
| 1308 | } |
| 1309 | |
| 1310 | /** |
| 1311 | * Get a CAS token from a SELECT result row |
| 1312 | * |
| 1313 | * @param IDatabase $db |
| 1314 | * @param stdClass $row A row for a key |
| 1315 | * @return string CAS token |
| 1316 | */ |
| 1317 | private function getCasTokenFromRow( IDatabase $db, stdClass $row ) { |
| 1318 | if ( isset( $row->castoken ) ) { |
| 1319 | $token = $row->castoken; |
| 1320 | } else { |
| 1321 | $token = sha1( $this->dbDecodeSerialValue( $db, $row->value ) ) . '@' . $row->exptime; |
| 1322 | $this->logger->debug( __METHOD__ . ": application computed hash for CAS token" ); |
| 1323 | } |
| 1324 | |
| 1325 | return $token; |
| 1326 | } |
| 1327 | |
| 1328 | /** |
| 1329 | * @param int $shardIndex |
| 1330 | * @throws DBError |
| 1331 | */ |
| 1332 | private function garbageCollect( $shardIndex ) { |
| 1333 | // set right away, avoid queuing duplicate async callbacks |
| 1334 | $this->lastGarbageCollect = $this->getCurrentTime(); |
| 1335 | |
| 1336 | $garbageCollector = function () use ( $shardIndex ) { |
| 1337 | $db = $this->getConnection( $shardIndex ); |
| 1338 | /** @noinspection PhpUnusedLocalVariableInspection */ |
| 1339 | $silenceScope = $this->silenceTransactionProfiler(); |
| 1340 | $this->deleteServerObjectsExpiringBefore( |
| 1341 | $db, |
| 1342 | (int)$this->getCurrentTime(), |
| 1343 | $this->purgeLimit |
| 1344 | ); |
| 1345 | $this->lastGarbageCollect = $this->getCurrentTime(); |
| 1346 | }; |
| 1347 | |
| 1348 | if ( $this->asyncHandler ) { |
| 1349 | ( $this->asyncHandler )( $garbageCollector ); |
| 1350 | } else { |
| 1351 | $garbageCollector(); |
| 1352 | } |
| 1353 | } |
| 1354 | |
| 1355 | /** |
| 1356 | * @deprecated since 1.41, use deleteObjectsExpiringBefore() instead |
| 1357 | */ |
| 1358 | public function expireAll() { |
| 1359 | wfDeprecated( __METHOD__, '1.41' ); |
| 1360 | $this->deleteObjectsExpiringBefore( (int)$this->getCurrentTime() ); |
| 1361 | } |
| 1362 | |
| 1363 | public function deleteObjectsExpiringBefore( |
| 1364 | $timestamp, |
| 1365 | callable $progress = null, |
| 1366 | $limit = INF, |
| 1367 | string $tag = null |
| 1368 | ) { |
| 1369 | /** @noinspection PhpUnusedLocalVariableInspection */ |
| 1370 | $silenceScope = $this->silenceTransactionProfiler(); |
| 1371 | |
| 1372 | if ( $tag !== null ) { |
| 1373 | // Purge one server only, to support concurrent purging in large wiki farms (T282761). |
| 1374 | $shardIndexes = []; |
| 1375 | if ( !$this->serverTags ) { |
| 1376 | throw new InvalidArgumentException( "Given a tag but no tags are configured" ); |
| 1377 | } |
| 1378 | foreach ( $this->serverTags as $serverShardIndex => $serverTag ) { |
| 1379 | if ( $tag === $serverTag ) { |
| 1380 | $shardIndexes[] = $serverShardIndex; |
| 1381 | break; |
| 1382 | } |
| 1383 | } |
| 1384 | if ( !$shardIndexes ) { |
| 1385 | throw new InvalidArgumentException( "Unknown server tag: $tag" ); |
| 1386 | } |
| 1387 | } else { |
| 1388 | $shardIndexes = $this->getShardServerIndexes(); |
| 1389 | shuffle( $shardIndexes ); |
| 1390 | } |
| 1391 | |
| 1392 | $ok = true; |
| 1393 | $numServers = count( $shardIndexes ); |
| 1394 | |
| 1395 | $keysDeletedCount = 0; |
| 1396 | foreach ( $shardIndexes as $numServersDone => $shardIndex ) { |
| 1397 | try { |
| 1398 | $db = $this->getConnection( $shardIndex ); |
| 1399 | |
| 1400 | // Avoid deadlock (T330377) |
| 1401 | $lockKey = "SqlBagOStuff-purge-shard:$shardIndex"; |
| 1402 | if ( !$db->lock( $lockKey, __METHOD__, 0 ) ) { |
| 1403 | $this->logger->info( "SqlBagOStuff purge for shard $shardIndex already locked, skip" ); |
| 1404 | continue; |
| 1405 | } |
| 1406 | |
| 1407 | $this->deleteServerObjectsExpiringBefore( |
| 1408 | $db, |
| 1409 | $timestamp, |
| 1410 | $limit, |
| 1411 | $keysDeletedCount, |
| 1412 | [ 'fn' => $progress, 'serversDone' => $numServersDone, 'serversTotal' => $numServers ] |
| 1413 | ); |
| 1414 | $db->unlock( $lockKey, __METHOD__ ); |
| 1415 | } catch ( DBError $e ) { |
| 1416 | $this->handleDBError( $e, $shardIndex ); |
| 1417 | $ok = false; |
| 1418 | } |
| 1419 | } |
| 1420 | |
| 1421 | return $ok; |
| 1422 | } |
| 1423 | |
| 1424 | /** |
| 1425 | * @param IDatabase $db |
| 1426 | * @param string|int $timestamp |
| 1427 | * @param int|float $limit Maximum number of rows to delete in total or INF for no limit |
| 1428 | * @param int &$keysDeletedCount |
| 1429 | * @param array|null $progress |
| 1430 | * @phan-param array{fn:?callback,serversDone:int,serversTotal:int}|null $progress |
| 1431 | * @throws DBError |
| 1432 | */ |
| 1433 | private function deleteServerObjectsExpiringBefore( |
| 1434 | IDatabase $db, |
| 1435 | $timestamp, |
| 1436 | $limit, |
| 1437 | &$keysDeletedCount = 0, |
| 1438 | array $progress = null |
| 1439 | ) { |
| 1440 | $cutoffUnix = ConvertibleTimestamp::convert( TS_UNIX, $timestamp ); |
| 1441 | if ( $this->multiPrimaryMode ) { |
| 1442 | // Eventual consistency requires the preservation of any key that was recently |
| 1443 | // modified. The key must exist on this database server long enough for the server |
| 1444 | // to receive, via replication, all writes to the key with lower timestamps. Such |
| 1445 | // writes should be no-ops since the existing key value should "win". If the network |
| 1446 | // partitions between datacenters A and B for 30 minutes, the database servers in |
| 1447 | // each datacenter will see an initial burst of writes with "old" timestamps via |
| 1448 | // replication. This might include writes with lower timestamps that the existing |
| 1449 | // key value. Therefore, clock skew and replication delay are both factors. |
| 1450 | $cutoffUnixSafe = (int)$this->getCurrentTime() - self::SAFE_PURGE_DELAY_SEC; |
| 1451 | $cutoffUnix = min( $cutoffUnix, $cutoffUnixSafe ); |
| 1452 | } |
| 1453 | $tableIndexes = range( 0, $this->numTableShards - 1 ); |
| 1454 | shuffle( $tableIndexes ); |
| 1455 | |
| 1456 | $batchSize = min( $this->writeBatchSize, $limit ); |
| 1457 | |
| 1458 | foreach ( $tableIndexes as $numShardsDone => $tableIndex ) { |
| 1459 | // The oldest expiry of a row we have deleted on this shard |
| 1460 | // (the first row that we deleted) |
| 1461 | $minExpUnix = null; |
| 1462 | // The most recent expiry time so far, from a row we have deleted on this shard |
| 1463 | $maxExp = null; |
| 1464 | // Size of the time range we'll delete, in seconds (for progress estimate) |
| 1465 | $totalSeconds = null; |
| 1466 | |
| 1467 | do { |
| 1468 | $res = $db->newSelectQueryBuilder() |
| 1469 | ->select( [ 'keyname', 'exptime' ] ) |
| 1470 | ->from( $this->getTableNameByShard( $tableIndex ) ) |
| 1471 | ->where( $db->expr( 'exptime', '<', $db->timestamp( $cutoffUnix ) ) ) |
| 1472 | ->andWhere( $maxExp ? $db->expr( 'exptime', '>=', $maxExp ) : [] ) |
| 1473 | ->orderBy( 'exptime', SelectQueryBuilder::SORT_ASC ) |
| 1474 | ->limit( $batchSize ) |
| 1475 | ->caller( __METHOD__ ) |
| 1476 | ->fetchResultSet(); |
| 1477 | |
| 1478 | if ( $res->numRows() ) { |
| 1479 | $row = $res->current(); |
| 1480 | if ( $minExpUnix === null ) { |
| 1481 | $minExpUnix = (int)ConvertibleTimestamp::convert( TS_UNIX, $row->exptime ); |
| 1482 | $totalSeconds = max( $cutoffUnix - $minExpUnix, 1 ); |
| 1483 | } |
| 1484 | |
| 1485 | $keys = []; |
| 1486 | foreach ( $res as $row ) { |
| 1487 | $keys[] = $row->keyname; |
| 1488 | $maxExp = $row->exptime; |
| 1489 | } |
| 1490 | |
| 1491 | $db->newDeleteQueryBuilder() |
| 1492 | ->deleteFrom( $this->getTableNameByShard( $tableIndex ) ) |
| 1493 | ->where( [ |
| 1494 | 'keyname' => $keys, |
| 1495 | $db->expr( 'exptime', '<', $db->timestamp( $cutoffUnix ) ), |
| 1496 | ] ) |
| 1497 | ->caller( __METHOD__ )->execute(); |
| 1498 | $keysDeletedCount += $db->affectedRows(); |
| 1499 | } |
| 1500 | |
| 1501 | if ( $progress && is_callable( $progress['fn'] ) ) { |
| 1502 | if ( $totalSeconds ) { |
| 1503 | $maxExpUnix = (int)ConvertibleTimestamp::convert( TS_UNIX, $maxExp ); |
| 1504 | $remainingSeconds = $cutoffUnix - $maxExpUnix; |
| 1505 | $processedSeconds = max( $totalSeconds - $remainingSeconds, 0 ); |
| 1506 | // For example, if we've done 1.5 table shard, and are thus half-way on the |
| 1507 | // 2nd of perhaps 5 tables on this server, then this might be: |
| 1508 | // `( 1 + ( 43200 / 86400 ) ) / 5 = 0.3`, or 30% done, of tables on this server. |
| 1509 | $tablesDoneRatio = |
| 1510 | ( $numShardsDone + ( $processedSeconds / $totalSeconds ) ) / $this->numTableShards; |
| 1511 | } else { |
| 1512 | $tablesDoneRatio = 1; |
| 1513 | } |
| 1514 | |
| 1515 | // For example, if we're 30% done on the last of 10 servers, then this might be: |
| 1516 | // `( 9 / 10 ) + ( 0.3 / 10 ) = 0.93`, or 93% done, overall. |
| 1517 | $overallRatio = ( $progress['serversDone'] / $progress['serversTotal'] ) + |
| 1518 | ( $tablesDoneRatio / $progress['serversTotal'] ); |
| 1519 | ( $progress['fn'] )( $overallRatio * 100 ); |
| 1520 | } |
| 1521 | } while ( $res->numRows() && $keysDeletedCount < $limit ); |
| 1522 | } |
| 1523 | } |
| 1524 | |
| 1525 | /** |
| 1526 | * Delete content of shard tables in every server. |
| 1527 | * Return true if the operation is successful, false otherwise. |
| 1528 | * |
| 1529 | * @deprecated since 1.41, unused. |
| 1530 | * |
| 1531 | * @return bool |
| 1532 | */ |
| 1533 | public function deleteAll() { |
| 1534 | wfDeprecated( __METHOD__, '1.41' ); |
| 1535 | /** @noinspection PhpUnusedLocalVariableInspection */ |
| 1536 | $silenceScope = $this->silenceTransactionProfiler(); |
| 1537 | foreach ( $this->getShardServerIndexes() as $shardIndex ) { |
| 1538 | try { |
| 1539 | $db = $this->getConnection( $shardIndex ); |
| 1540 | for ( $i = 0; $i < $this->numTableShards; $i++ ) { |
| 1541 | $db->newDeleteQueryBuilder() |
| 1542 | ->deleteFrom( $this->getTableNameByShard( $i ) ) |
| 1543 | ->where( $db::ALL_ROWS ) |
| 1544 | ->caller( __METHOD__ )->execute(); |
| 1545 | } |
| 1546 | } catch ( DBError $e ) { |
| 1547 | $this->handleDBError( $e, $shardIndex ); |
| 1548 | return false; |
| 1549 | } |
| 1550 | } |
| 1551 | return true; |
| 1552 | } |
| 1553 | |
| 1554 | public function doLock( $key, $timeout = 6, $exptime = 6 ) { |
| 1555 | /** @noinspection PhpUnusedLocalVariableInspection */ |
| 1556 | $silenceScope = $this->silenceTransactionProfiler(); |
| 1557 | |
| 1558 | $lockTsUnix = null; |
| 1559 | |
| 1560 | [ $shardIndex ] = $this->getKeyLocation( $key ); |
| 1561 | try { |
| 1562 | $db = $this->getConnection( $shardIndex ); |
| 1563 | $lockTsUnix = $db->lock( $key, __METHOD__, $timeout, $db::LOCK_TIMESTAMP ); |
| 1564 | } catch ( DBError $e ) { |
| 1565 | $this->handleDBError( $e, $shardIndex ); |
| 1566 | $this->logger->warning( |
| 1567 | __METHOD__ . ' failed due to I/O error for {key}.', |
| 1568 | [ 'key' => $key ] |
| 1569 | ); |
| 1570 | } |
| 1571 | |
| 1572 | return $lockTsUnix; |
| 1573 | } |
| 1574 | |
| 1575 | public function doUnlock( $key ) { |
| 1576 | /** @noinspection PhpUnusedLocalVariableInspection */ |
| 1577 | $silenceScope = $this->silenceTransactionProfiler(); |
| 1578 | |
| 1579 | [ $shardIndex ] = $this->getKeyLocation( $key ); |
| 1580 | |
| 1581 | try { |
| 1582 | $db = $this->getConnection( $shardIndex ); |
| 1583 | $released = $db->unlock( $key, __METHOD__ ); |
| 1584 | } catch ( DBError $e ) { |
| 1585 | $this->handleDBError( $e, $shardIndex ); |
| 1586 | $released = false; |
| 1587 | } |
| 1588 | |
| 1589 | return $released; |
| 1590 | } |
| 1591 | |
| 1592 | protected function makeKeyInternal( $keyspace, $components ) { |
| 1593 | // SQL schema for 'objectcache' specifies keys as varchar(255). From that, |
| 1594 | // subtract the number of characters we need for the keyspace and for |
| 1595 | // the separator character needed for each argument. To handle some |
| 1596 | // custom prefixes used by thing like WANObjectCache, limit to 205. |
| 1597 | $keyspace = strtr( $keyspace, ' ', '_' ); |
| 1598 | $charsLeft = 205 - strlen( $keyspace ) - count( $components ); |
| 1599 | foreach ( $components as &$component ) { |
| 1600 | $component = strtr( $component, [ |
| 1601 | ' ' => '_', // Avoid unnecessary misses from pre-1.35 code |
| 1602 | ':' => '%3A', |
| 1603 | ] ); |
| 1604 | |
| 1605 | // 33 = 32 characters for the MD5 + 1 for the '#' prefix. |
| 1606 | if ( $charsLeft > 33 && strlen( $component ) > $charsLeft ) { |
| 1607 | $component = '#' . md5( $component ); |
| 1608 | } |
| 1609 | $charsLeft -= strlen( $component ); |
| 1610 | } |
| 1611 | |
| 1612 | if ( $charsLeft < 0 ) { |
| 1613 | return $keyspace . ':BagOStuff-long-key:##' . md5( implode( ':', $components ) ); |
| 1614 | } |
| 1615 | return $keyspace . ':' . implode( ':', $components ); |
| 1616 | } |
| 1617 | |
| 1618 | protected function requireConvertGenericKey(): bool { |
| 1619 | return true; |
| 1620 | } |
| 1621 | |
| 1622 | protected function serialize( $value ) { |
| 1623 | if ( is_int( $value ) ) { |
| 1624 | return $value; |
| 1625 | } |
| 1626 | |
| 1627 | $serial = serialize( $value ); |
| 1628 | if ( $this->hasZlib ) { |
| 1629 | // On typical message and page data, this can provide a 3X storage savings |
| 1630 | $serial = gzdeflate( $serial ); |
| 1631 | } |
| 1632 | |
| 1633 | return $serial; |
| 1634 | } |
| 1635 | |
| 1636 | protected function unserialize( $value ) { |
| 1637 | if ( $value === self::TOMB_SERIAL ) { |
| 1638 | return false; // tombstone |
| 1639 | } |
| 1640 | |
| 1641 | if ( $this->isInteger( $value ) ) { |
| 1642 | return (int)$value; |
| 1643 | } |
| 1644 | |
| 1645 | if ( $this->hasZlib ) { |
| 1646 | AtEase::suppressWarnings(); |
| 1647 | $decompressed = gzinflate( $value ); |
| 1648 | AtEase::restoreWarnings(); |
| 1649 | |
| 1650 | if ( $decompressed !== false ) { |
| 1651 | $value = $decompressed; |
| 1652 | } |
| 1653 | } |
| 1654 | |
| 1655 | return unserialize( $value ); |
| 1656 | } |
| 1657 | |
| 1658 | private function getLoadBalancer(): ILoadBalancer { |
| 1659 | if ( !$this->loadBalancer ) { |
| 1660 | $this->loadBalancer = ( $this->loadBalancerCallback )(); |
| 1661 | } |
| 1662 | return $this->loadBalancer; |
| 1663 | } |
| 1664 | |
| 1665 | /** |
| 1666 | * @return IMaintainableDatabase |
| 1667 | * @throws DBError |
| 1668 | */ |
| 1669 | private function getConnectionViaLoadBalancer() { |
| 1670 | $lb = $this->getLoadBalancer(); |
| 1671 | |
| 1672 | if ( $lb->getServerAttributes( $lb->getWriterIndex() )[Database::ATTR_DB_LEVEL_LOCKING] ) { |
| 1673 | // Use the main connection to avoid transaction deadlocks |
| 1674 | $conn = $lb->getMaintenanceConnectionRef( DB_PRIMARY, [], $this->dbDomain ); |
| 1675 | } else { |
| 1676 | // If the RDBMS has row/table/page level locking, then use separate auto-commit |
| 1677 | // connection to avoid needless contention and deadlocks. |
| 1678 | $conn = $lb->getMaintenanceConnectionRef( |
| 1679 | $this->replicaOnly ? DB_REPLICA : DB_PRIMARY, |
| 1680 | [], |
| 1681 | $this->dbDomain, |
| 1682 | $lb::CONN_TRX_AUTOCOMMIT |
| 1683 | ); |
| 1684 | } |
| 1685 | |
| 1686 | // Make sure any errors are thrown now while we can more easily handle them |
| 1687 | $conn->ensureConnection(); |
| 1688 | return $conn; |
| 1689 | } |
| 1690 | |
| 1691 | /** |
| 1692 | * @param int $shardIndex |
| 1693 | * @param array $server Server config map |
| 1694 | * @return IMaintainableDatabase |
| 1695 | * @throws DBError |
| 1696 | */ |
| 1697 | private function getConnectionFromServerInfo( $shardIndex, array $server ) { |
| 1698 | if ( !isset( $this->conns[$shardIndex] ) ) { |
| 1699 | $server['logger'] = $this->logger; |
| 1700 | // Make sure this handle always uses autocommit mode, even if DBO_TRX is |
| 1701 | // configured. |
| 1702 | $server['flags'] &= ~DBO_TRX; |
| 1703 | |
| 1704 | /** @var IMaintainableDatabase $conn Auto-commit connection to the server */ |
| 1705 | $conn = MediaWikiServices::getInstance()->getDatabaseFactory() |
| 1706 | ->create( $server['type'], $server ); |
| 1707 | |
| 1708 | // Automatically create the objectcache table for sqlite as needed |
| 1709 | if ( $conn->getType() === 'sqlite' ) { |
| 1710 | $this->initSqliteDatabase( $conn ); |
| 1711 | } |
| 1712 | $this->conns[$shardIndex] = $conn; |
| 1713 | } |
| 1714 | |
| 1715 | // @phan-suppress-next-line PhanTypeMismatchReturnNullable False positive |
| 1716 | return $this->conns[$shardIndex]; |
| 1717 | } |
| 1718 | |
| 1719 | /** |
| 1720 | * Handle a DBError which occurred during a read operation. |
| 1721 | * |
| 1722 | * @param DBError $exception |
| 1723 | * @param int $shardIndex Server index |
| 1724 | */ |
| 1725 | private function handleDBError( DBError $exception, $shardIndex ) { |
| 1726 | if ( !$this->useLB && $exception instanceof DBConnectionError ) { |
| 1727 | unset( $this->conns[$shardIndex] ); // bug T103435 |
| 1728 | |
| 1729 | $now = $this->getCurrentTime(); |
| 1730 | if ( isset( $this->connFailureTimes[$shardIndex] ) ) { |
| 1731 | if ( $now - $this->connFailureTimes[$shardIndex] >= 60 ) { |
| 1732 | unset( $this->connFailureTimes[$shardIndex] ); |
| 1733 | unset( $this->connFailureErrors[$shardIndex] ); |
| 1734 | } else { |
| 1735 | $this->logger->debug( __METHOD__ . ": Server #$shardIndex already down" ); |
| 1736 | return; |
| 1737 | } |
| 1738 | } |
| 1739 | $this->logger->info( __METHOD__ . ": Server #$shardIndex down until " . ( $now + 60 ) ); |
| 1740 | $this->connFailureTimes[$shardIndex] = $now; |
| 1741 | $this->connFailureErrors[$shardIndex] = $exception; |
| 1742 | } |
| 1743 | $this->logger->error( "DBError: {$exception->getMessage()}", [ 'exception' => $exception ] ); |
| 1744 | if ( $exception instanceof DBConnectionError ) { |
| 1745 | $this->setLastError( self::ERR_UNREACHABLE ); |
| 1746 | $this->logger->warning( __METHOD__ . ": ignoring connection error" ); |
| 1747 | } else { |
| 1748 | $this->setLastError( self::ERR_UNEXPECTED ); |
| 1749 | $this->logger->warning( __METHOD__ . ": ignoring query error" ); |
| 1750 | } |
| 1751 | } |
| 1752 | |
| 1753 | /** |
| 1754 | * @param IMaintainableDatabase $db |
| 1755 | * @throws DBError |
| 1756 | */ |
| 1757 | private function initSqliteDatabase( IMaintainableDatabase $db ) { |
| 1758 | if ( $db->tableExists( 'objectcache', __METHOD__ ) ) { |
| 1759 | return; |
| 1760 | } |
| 1761 | // Use one table for SQLite; sharding does not seem to have much benefit |
| 1762 | $db->query( "PRAGMA journal_mode=WAL", __METHOD__ ); // this is permanent |
| 1763 | $db->startAtomic( __METHOD__ ); // atomic DDL |
| 1764 | try { |
| 1765 | $encTable = $db->tableName( 'objectcache' ); |
| 1766 | $encExptimeIndex = $db->addIdentifierQuotes( $db->tablePrefix() . 'exptime' ); |
| 1767 | $db->query( |
| 1768 | "CREATE TABLE $encTable (\n" . |
| 1769 | " keyname BLOB NOT NULL default '' PRIMARY KEY,\n" . |
| 1770 | " value BLOB,\n" . |
| 1771 | " exptime BLOB NOT NULL\n" . |
| 1772 | ")", |
| 1773 | __METHOD__ |
| 1774 | ); |
| 1775 | $db->query( "CREATE INDEX $encExptimeIndex ON $encTable (exptime)", __METHOD__ ); |
| 1776 | $db->endAtomic( __METHOD__ ); |
| 1777 | } catch ( DBError $e ) { |
| 1778 | $db->rollback( __METHOD__ ); |
| 1779 | throw $e; |
| 1780 | } |
| 1781 | } |
| 1782 | |
| 1783 | /** |
| 1784 | * Create the shard tables on all databases |
| 1785 | * |
| 1786 | * This is typically called manually by a sysadmin via eval.php, e.g. for ParserCache: |
| 1787 | * |
| 1788 | * @code |
| 1789 | * ObjectCache::getInstance( 'myparsercache' )->createTables(); |
| 1790 | * @endcode |
| 1791 | * |
| 1792 | * This is different from `$services->getParserCache()->getCacheStorage()->createTables()`, |
| 1793 | * which would use the backend set via $wgParserCacheType, which shouldn't be |
| 1794 | * set yet for the backend you are creating shard tables on. The expectation |
| 1795 | * is to first add the new backend to $wgObjectCaches, run the above, and then enable |
| 1796 | * it for live ParserCache traffic by setting $wgParserCacheType. |
| 1797 | */ |
| 1798 | public function createTables() { |
| 1799 | foreach ( $this->getShardServerIndexes() as $shardIndex ) { |
| 1800 | $db = $this->getConnection( $shardIndex ); |
| 1801 | if ( in_array( $db->getType(), [ 'mysql', 'postgres' ], true ) ) { |
| 1802 | for ( $i = 0; $i < $this->numTableShards; $i++ ) { |
| 1803 | $encBaseTable = $db->tableName( 'objectcache' ); |
| 1804 | $encShardTable = $db->tableName( $this->getTableNameByShard( $i ) ); |
| 1805 | $db->query( "CREATE TABLE $encShardTable LIKE $encBaseTable", __METHOD__ ); |
| 1806 | } |
| 1807 | } |
| 1808 | } |
| 1809 | } |
| 1810 | |
| 1811 | /** |
| 1812 | * @return int[] List of server indexes |
| 1813 | */ |
| 1814 | private function getShardServerIndexes() { |
| 1815 | if ( $this->useLB ) { |
| 1816 | // LoadBalancer based configuration |
| 1817 | $shardIndexes = [ 0 ]; |
| 1818 | } else { |
| 1819 | // Striped array of database servers |
| 1820 | $shardIndexes = array_keys( $this->serverTags ); |
| 1821 | } |
| 1822 | |
| 1823 | return $shardIndexes; |
| 1824 | } |
| 1825 | |
| 1826 | /** |
| 1827 | * Silence the transaction profiler until the return value falls out of scope |
| 1828 | * |
| 1829 | * @return ScopedCallback|null |
| 1830 | */ |
| 1831 | private function silenceTransactionProfiler() { |
| 1832 | if ( $this->serverInfos ) { |
| 1833 | return null; // no TransactionProfiler injected anyway |
| 1834 | } |
| 1835 | return Profiler::instance()->getTransactionProfiler()->silenceForScope(); |
| 1836 | } |
| 1837 | } |