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| 1 | <?php |
| 2 | /** |
| 3 | * This program is free software; you can redistribute it and/or modify |
| 4 | * it under the terms of the GNU General Public License as published by |
| 5 | * the Free Software Foundation; either version 2 of the License, or |
| 6 | * (at your option) any later version. |
| 7 | * |
| 8 | * This program is distributed in the hope that it will be useful, |
| 9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 11 | * GNU General Public License for more details. |
| 12 | * |
| 13 | * You should have received a copy of the GNU General Public License along |
| 14 | * with this program; if not, write to the Free Software Foundation, Inc., |
| 15 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. |
| 16 | * http://www.gnu.org/copyleft/gpl.html |
| 17 | * |
| 18 | * @file |
| 19 | */ |
| 20 | |
| 21 | namespace Wikimedia\Rdbms; |
| 22 | |
| 23 | use PgSql\Connection; |
| 24 | use PgSql\Result; |
| 25 | use RuntimeException; |
| 26 | use Wikimedia\Rdbms\Platform\PostgresPlatform; |
| 27 | use Wikimedia\Rdbms\Replication\ReplicationReporter; |
| 28 | use Wikimedia\WaitConditionLoop; |
| 29 | |
| 30 | /** |
| 31 | * Postgres database abstraction layer. |
| 32 | * |
| 33 | * @ingroup Database |
| 34 | */ |
| 35 | class DatabasePostgres extends Database { |
| 36 | /** @var int */ |
| 37 | private $port; |
| 38 | /** @var string */ |
| 39 | private $tempSchema; |
| 40 | /** @var float|string|null */ |
| 41 | private $numericVersion; |
| 42 | |
| 43 | /** @var Result|null */ |
| 44 | private $lastResultHandle; |
| 45 | |
| 46 | /** @var PostgresPlatform */ |
| 47 | protected $platform; |
| 48 | |
| 49 | /** |
| 50 | * @see Database::__construct() |
| 51 | * @param array $params Additional parameters include: |
| 52 | * - port: A port to append to the hostname |
| 53 | */ |
| 54 | public function __construct( array $params ) { |
| 55 | $this->port = intval( $params['port'] ?? null ); |
| 56 | parent::__construct( $params ); |
| 57 | |
| 58 | $this->platform = new PostgresPlatform( |
| 59 | $this, |
| 60 | $this->logger, |
| 61 | $this->currentDomain, |
| 62 | $this->errorLogger |
| 63 | ); |
| 64 | $this->replicationReporter = new ReplicationReporter( |
| 65 | $params['topologyRole'], |
| 66 | $this->logger, |
| 67 | $params['srvCache'] |
| 68 | ); |
| 69 | } |
| 70 | |
| 71 | public function getType() { |
| 72 | return 'postgres'; |
| 73 | } |
| 74 | |
| 75 | protected function open( $server, $user, $password, $db, $schema, $tablePrefix ) { |
| 76 | if ( !function_exists( 'pg_connect' ) ) { |
| 77 | throw $this->newExceptionAfterConnectError( |
| 78 | "Postgres functions missing, have you compiled PHP with the --with-pgsql\n" . |
| 79 | "option? (Note: if you recently installed PHP, you may need to restart your\n" . |
| 80 | "webserver and database)" |
| 81 | ); |
| 82 | } |
| 83 | |
| 84 | $this->close( __METHOD__ ); |
| 85 | |
| 86 | $connectVars = [ |
| 87 | // A database must be specified in order to connect to Postgres. If $dbName is not |
| 88 | // specified, then use the standard "postgres" database that should exist by default. |
| 89 | 'dbname' => ( $db !== null && $db !== '' ) ? $db : 'postgres', |
| 90 | 'user' => $user, |
| 91 | 'password' => $password |
| 92 | ]; |
| 93 | if ( $server !== null && $server !== '' ) { |
| 94 | $connectVars['host'] = $server; |
| 95 | } |
| 96 | if ( $this->port > 0 ) { |
| 97 | $connectVars['port'] = $this->port; |
| 98 | } |
| 99 | if ( $this->ssl ) { |
| 100 | $connectVars['sslmode'] = 'require'; |
| 101 | } |
| 102 | $connectString = $this->makeConnectionString( $connectVars ); |
| 103 | |
| 104 | $this->installErrorHandler(); |
| 105 | try { |
| 106 | $this->conn = pg_connect( $connectString, PGSQL_CONNECT_FORCE_NEW ) ?: null; |
| 107 | } catch ( RuntimeException $e ) { |
| 108 | $this->restoreErrorHandler(); |
| 109 | throw $this->newExceptionAfterConnectError( $e->getMessage() ); |
| 110 | } |
| 111 | $error = $this->restoreErrorHandler(); |
| 112 | |
| 113 | if ( !$this->conn ) { |
| 114 | throw $this->newExceptionAfterConnectError( $error ?: $this->lastError() ); |
| 115 | } |
| 116 | |
| 117 | try { |
| 118 | // Since no transaction is active at this point, any SET commands should apply |
| 119 | // for the entire session (e.g. will not be reverted on transaction rollback). |
| 120 | // See https://www.postgresql.org/docs/8.3/sql-set.html |
| 121 | $variables = [ |
| 122 | 'client_encoding' => 'UTF8', |
| 123 | 'datestyle' => 'ISO, YMD', |
| 124 | 'timezone' => 'GMT', |
| 125 | 'standard_conforming_strings' => 'on', |
| 126 | 'bytea_output' => 'escape', |
| 127 | 'client_min_messages' => 'ERROR' |
| 128 | ]; |
| 129 | foreach ( $variables as $var => $val ) { |
| 130 | $sql = 'SET ' . $this->platform->addIdentifierQuotes( $var ) . ' = ' . $this->addQuotes( $val ); |
| 131 | $query = new Query( $sql, self::QUERY_NO_RETRY | self::QUERY_CHANGE_TRX, 'SET' ); |
| 132 | $this->query( $query, __METHOD__ ); |
| 133 | } |
| 134 | $this->determineCoreSchema( $schema ); |
| 135 | $this->currentDomain = new DatabaseDomain( $db, $schema, $tablePrefix ); |
| 136 | $this->platform->setCurrentDomain( $this->currentDomain ); |
| 137 | } catch ( RuntimeException $e ) { |
| 138 | throw $this->newExceptionAfterConnectError( $e->getMessage() ); |
| 139 | } |
| 140 | } |
| 141 | |
| 142 | public function databasesAreIndependent() { |
| 143 | return true; |
| 144 | } |
| 145 | |
| 146 | public function doSelectDomain( DatabaseDomain $domain ) { |
| 147 | $database = $domain->getDatabase(); |
| 148 | if ( $database === null ) { |
| 149 | // A null database means "don't care" so leave it as is and update the table prefix |
| 150 | $this->currentDomain = new DatabaseDomain( |
| 151 | $this->currentDomain->getDatabase(), |
| 152 | $domain->getSchema() ?? $this->currentDomain->getSchema(), |
| 153 | $domain->getTablePrefix() |
| 154 | ); |
| 155 | $this->platform->setCurrentDomain( $this->currentDomain ); |
| 156 | } elseif ( $this->getDBname() !== $database ) { |
| 157 | // Postgres doesn't support selectDB in the same way MySQL does. |
| 158 | // So if the DB name doesn't match the open connection, open a new one |
| 159 | $this->open( |
| 160 | $this->connectionParams[self::CONN_HOST], |
| 161 | $this->connectionParams[self::CONN_USER], |
| 162 | $this->connectionParams[self::CONN_PASSWORD], |
| 163 | $database, |
| 164 | $domain->getSchema(), |
| 165 | $domain->getTablePrefix() |
| 166 | ); |
| 167 | } else { |
| 168 | $this->currentDomain = $domain; |
| 169 | $this->platform->setCurrentDomain( $domain ); |
| 170 | } |
| 171 | |
| 172 | return true; |
| 173 | } |
| 174 | |
| 175 | protected function getBindingHandle(): Connection { |
| 176 | return parent::getBindingHandle(); |
| 177 | } |
| 178 | |
| 179 | /** |
| 180 | * @param string[] $vars |
| 181 | * @return string |
| 182 | */ |
| 183 | private function makeConnectionString( $vars ) { |
| 184 | $s = ''; |
| 185 | foreach ( $vars as $name => $value ) { |
| 186 | $s .= "$name='" . str_replace( [ "\\", "'" ], [ "\\\\", "\\'" ], $value ) . "' "; |
| 187 | } |
| 188 | |
| 189 | return $s; |
| 190 | } |
| 191 | |
| 192 | protected function closeConnection() { |
| 193 | return $this->conn ? pg_close( $this->conn ) : true; |
| 194 | } |
| 195 | |
| 196 | public function doSingleStatementQuery( string $sql ): QueryStatus { |
| 197 | $conn = $this->getBindingHandle(); |
| 198 | |
| 199 | $sql = mb_convert_encoding( $sql, 'UTF-8' ); |
| 200 | // Clear any previously left over result |
| 201 | // phpcs:ignore Generic.CodeAnalysis.AssignmentInCondition.FoundInWhileCondition |
| 202 | while ( $priorRes = pg_get_result( $conn ) ) { |
| 203 | pg_free_result( $priorRes ); |
| 204 | } |
| 205 | |
| 206 | if ( pg_send_query( $conn, $sql ) === false ) { |
| 207 | throw new DBUnexpectedError( $this, "Unable to post new query to PostgreSQL\n" ); |
| 208 | } |
| 209 | |
| 210 | $pgRes = pg_get_result( $conn ); |
| 211 | $this->lastResultHandle = $pgRes; |
| 212 | $res = pg_result_error( $pgRes ) ? false : $pgRes; |
| 213 | |
| 214 | return new QueryStatus( |
| 215 | is_bool( $res ) ? $res : new PostgresResultWrapper( $this, $conn, $res ), |
| 216 | $pgRes ? pg_affected_rows( $pgRes ) : 0, |
| 217 | $this->lastError(), |
| 218 | $this->lastErrno() |
| 219 | ); |
| 220 | } |
| 221 | |
| 222 | protected function dumpError() { |
| 223 | $diags = [ |
| 224 | PGSQL_DIAG_SEVERITY, |
| 225 | PGSQL_DIAG_SQLSTATE, |
| 226 | PGSQL_DIAG_MESSAGE_PRIMARY, |
| 227 | PGSQL_DIAG_MESSAGE_DETAIL, |
| 228 | PGSQL_DIAG_MESSAGE_HINT, |
| 229 | PGSQL_DIAG_STATEMENT_POSITION, |
| 230 | PGSQL_DIAG_INTERNAL_POSITION, |
| 231 | PGSQL_DIAG_INTERNAL_QUERY, |
| 232 | PGSQL_DIAG_CONTEXT, |
| 233 | PGSQL_DIAG_SOURCE_FILE, |
| 234 | PGSQL_DIAG_SOURCE_LINE, |
| 235 | PGSQL_DIAG_SOURCE_FUNCTION |
| 236 | ]; |
| 237 | foreach ( $diags as $d ) { |
| 238 | $this->logger->debug( sprintf( "PgSQL ERROR(%d): %s", |
| 239 | $d, pg_result_error_field( $this->lastResultHandle, $d ) ) ); |
| 240 | } |
| 241 | } |
| 242 | |
| 243 | protected function lastInsertId() { |
| 244 | // Avoid using query() to prevent unwanted side-effects like changing affected |
| 245 | // row counts or connection retries. Note that lastval() is connection-specific. |
| 246 | // Note that this causes "lastval is not yet defined in this session" errors if |
| 247 | // nextval() was never directly or implicitly triggered (error out any transaction). |
| 248 | $qs = $this->doSingleStatementQuery( "SELECT lastval() AS id" ); |
| 249 | |
| 250 | return $qs->res ? (int)$qs->res->fetchRow()['id'] : 0; |
| 251 | } |
| 252 | |
| 253 | public function lastError() { |
| 254 | if ( $this->conn ) { |
| 255 | if ( $this->lastResultHandle ) { |
| 256 | return pg_result_error( $this->lastResultHandle ); |
| 257 | } else { |
| 258 | return pg_last_error() ?: $this->lastConnectError; |
| 259 | } |
| 260 | } |
| 261 | |
| 262 | return $this->getLastPHPError() ?: 'No database connection'; |
| 263 | } |
| 264 | |
| 265 | public function lastErrno() { |
| 266 | if ( $this->lastResultHandle ) { |
| 267 | $lastErrno = pg_result_error_field( $this->lastResultHandle, PGSQL_DIAG_SQLSTATE ); |
| 268 | if ( $lastErrno !== false ) { |
| 269 | return $lastErrno; |
| 270 | } |
| 271 | } |
| 272 | |
| 273 | return '00000'; |
| 274 | } |
| 275 | |
| 276 | public function estimateRowCount( $table, $var = '*', $conds = '', |
| 277 | $fname = __METHOD__, $options = [], $join_conds = [] |
| 278 | ): int { |
| 279 | $conds = $this->platform->normalizeConditions( $conds, $fname ); |
| 280 | $column = $this->platform->extractSingleFieldFromList( $var ); |
| 281 | if ( is_string( $column ) && !in_array( $column, [ '*', '1' ] ) ) { |
| 282 | $conds[] = "$column IS NOT NULL"; |
| 283 | } |
| 284 | |
| 285 | $options['EXPLAIN'] = true; |
| 286 | $res = $this->select( $table, $var, $conds, $fname, $options, $join_conds ); |
| 287 | $rows = -1; |
| 288 | if ( $res ) { |
| 289 | $row = $res->fetchRow(); |
| 290 | $count = []; |
| 291 | if ( preg_match( '/rows=(\d+)/', $row[0], $count ) ) { |
| 292 | $rows = (int)$count[1]; |
| 293 | } |
| 294 | } |
| 295 | |
| 296 | return $rows; |
| 297 | } |
| 298 | |
| 299 | public function indexInfo( $table, $index, $fname = __METHOD__ ) { |
| 300 | $components = $this->platform->qualifiedTableComponents( $table ); |
| 301 | if ( count( $components ) === 1 ) { |
| 302 | $schemas = $this->getCoreSchemas(); |
| 303 | $tableComponent = $components[0]; |
| 304 | } elseif ( count( $components ) === 2 ) { |
| 305 | [ $schema, $tableComponent ] = $components; |
| 306 | $schemas = [ $schema ]; |
| 307 | } else { |
| 308 | [ , $schema, $tableComponent ] = $components; |
| 309 | $schemas = [ $schema ]; |
| 310 | } |
| 311 | foreach ( $schemas as $schema ) { |
| 312 | $encSchema = $this->addQuotes( $schema ); |
| 313 | $encTable = $this->addQuotes( $tableComponent ); |
| 314 | $encIndex = $this->addQuotes( $index ); |
| 315 | $query = new Query( |
| 316 | "SELECT indexname,indexdef FROM pg_indexes " . |
| 317 | "WHERE schemaname=$encSchema AND tablename=$encTable AND indexname=$encIndex", |
| 318 | self::QUERY_IGNORE_DBO_TRX | self::QUERY_CHANGE_NONE, |
| 319 | 'SELECT' |
| 320 | ); |
| 321 | $res = $this->query( $query ); |
| 322 | $row = $res->fetchObject(); |
| 323 | |
| 324 | if ( $row ) { |
| 325 | return [ 'unique' => str_starts_with( $row->indexdef, 'CREATE UNIQUE ' ) ]; |
| 326 | } |
| 327 | } |
| 328 | |
| 329 | return false; |
| 330 | } |
| 331 | |
| 332 | public function indexAttributes( $index, $schema = false ) { |
| 333 | if ( $schema === false ) { |
| 334 | $schemas = $this->getCoreSchemas(); |
| 335 | } else { |
| 336 | $schemas = [ $schema ]; |
| 337 | } |
| 338 | |
| 339 | $eindex = $this->addQuotes( $index ); |
| 340 | |
| 341 | $flags = self::QUERY_IGNORE_DBO_TRX | self::QUERY_CHANGE_NONE; |
| 342 | foreach ( $schemas as $schema ) { |
| 343 | $eschema = $this->addQuotes( $schema ); |
| 344 | /* |
| 345 | * A subquery would be not needed if we didn't care about the order |
| 346 | * of attributes, but we do |
| 347 | */ |
| 348 | $sql = <<<__INDEXATTR__ |
| 349 | |
| 350 | SELECT opcname, |
| 351 | attname, |
| 352 | i.indoption[s.g] as option, |
| 353 | pg_am.amname |
| 354 | FROM |
| 355 | (SELECT generate_series(array_lower(isub.indkey,1), array_upper(isub.indkey,1)) AS g |
| 356 | FROM |
| 357 | pg_index isub |
| 358 | JOIN pg_class cis |
| 359 | ON cis.oid=isub.indexrelid |
| 360 | JOIN pg_namespace ns |
| 361 | ON cis.relnamespace = ns.oid |
| 362 | WHERE cis.relname=$eindex AND ns.nspname=$eschema) AS s, |
| 363 | pg_attribute, |
| 364 | pg_opclass opcls, |
| 365 | pg_am, |
| 366 | pg_class ci |
| 367 | JOIN pg_index i |
| 368 | ON ci.oid=i.indexrelid |
| 369 | JOIN pg_class ct |
| 370 | ON ct.oid = i.indrelid |
| 371 | JOIN pg_namespace n |
| 372 | ON ci.relnamespace = n.oid |
| 373 | WHERE |
| 374 | ci.relname=$eindex AND n.nspname=$eschema |
| 375 | AND attrelid = ct.oid |
| 376 | AND i.indkey[s.g] = attnum |
| 377 | AND i.indclass[s.g] = opcls.oid |
| 378 | AND pg_am.oid = opcls.opcmethod |
| 379 | __INDEXATTR__; |
| 380 | $query = new Query( $sql, $flags, 'SELECT' ); |
| 381 | $res = $this->query( $query, __METHOD__ ); |
| 382 | $a = []; |
| 383 | if ( $res ) { |
| 384 | foreach ( $res as $row ) { |
| 385 | $a[] = [ |
| 386 | $row->attname, |
| 387 | $row->opcname, |
| 388 | $row->amname, |
| 389 | $row->option ]; |
| 390 | } |
| 391 | return $a; |
| 392 | } |
| 393 | } |
| 394 | return null; |
| 395 | } |
| 396 | |
| 397 | protected function doInsertSelectNative( |
| 398 | $destTable, |
| 399 | $srcTable, |
| 400 | array $varMap, |
| 401 | $conds, |
| 402 | $fname, |
| 403 | array $insertOptions, |
| 404 | array $selectOptions, |
| 405 | $selectJoinConds |
| 406 | ) { |
| 407 | if ( in_array( 'IGNORE', $insertOptions ) ) { |
| 408 | // Use "ON CONFLICT DO" if we have it for IGNORE |
| 409 | $destTableEnc = $this->tableName( $destTable ); |
| 410 | |
| 411 | $selectSql = $this->selectSQLText( |
| 412 | $srcTable, |
| 413 | array_values( $varMap ), |
| 414 | $conds, |
| 415 | $fname, |
| 416 | $selectOptions, |
| 417 | $selectJoinConds |
| 418 | ); |
| 419 | |
| 420 | $sql = "INSERT INTO $destTableEnc (" . implode( ',', array_keys( $varMap ) ) . ') ' . |
| 421 | $selectSql . ' ON CONFLICT DO NOTHING'; |
| 422 | $query = new Query( $sql, self::QUERY_CHANGE_ROWS, 'INSERT', $destTable ); |
| 423 | $this->query( $query, $fname ); |
| 424 | } else { |
| 425 | parent::doInsertSelectNative( $destTable, $srcTable, $varMap, $conds, $fname, |
| 426 | $insertOptions, $selectOptions, $selectJoinConds ); |
| 427 | } |
| 428 | } |
| 429 | |
| 430 | public function getValueTypesForWithClause( $table ) { |
| 431 | $typesByColumn = []; |
| 432 | |
| 433 | $flags = self::QUERY_IGNORE_DBO_TRX | self::QUERY_CHANGE_NONE; |
| 434 | $encTable = $this->addQuotes( $table ); |
| 435 | foreach ( $this->getCoreSchemas() as $schema ) { |
| 436 | $encSchema = $this->addQuotes( $schema ); |
| 437 | $sql = "SELECT column_name,udt_name " . |
| 438 | "FROM information_schema.columns " . |
| 439 | "WHERE table_name = $encTable AND table_schema = $encSchema"; |
| 440 | $query = new Query( $sql, $flags, 'SELECT' ); |
| 441 | $res = $this->query( $query, __METHOD__ ); |
| 442 | if ( $res->numRows() ) { |
| 443 | foreach ( $res as $row ) { |
| 444 | $typesByColumn[$row->column_name] = $row->udt_name; |
| 445 | } |
| 446 | break; |
| 447 | } |
| 448 | } |
| 449 | |
| 450 | return $typesByColumn; |
| 451 | } |
| 452 | |
| 453 | protected function isConnectionError( $errno ) { |
| 454 | // https://www.postgresql.org/docs/9.2/static/errcodes-appendix.html |
| 455 | static $codes = [ '08000', '08003', '08006', '08001', '08004', '57P01', '57P03', '53300' ]; |
| 456 | |
| 457 | return in_array( $errno, $codes, true ); |
| 458 | } |
| 459 | |
| 460 | protected function isQueryTimeoutError( $errno ) { |
| 461 | // https://www.postgresql.org/docs/9.2/static/errcodes-appendix.html |
| 462 | return ( $errno === '57014' ); |
| 463 | } |
| 464 | |
| 465 | protected function isKnownStatementRollbackError( $errno ) { |
| 466 | return false; // transaction has to be rolled-back from error state |
| 467 | } |
| 468 | |
| 469 | public function duplicateTableStructure( |
| 470 | $oldName, $newName, $temporary = false, $fname = __METHOD__ |
| 471 | ) { |
| 472 | $newNameE = $this->platform->addIdentifierQuotes( $newName ); |
| 473 | $oldNameE = $this->platform->addIdentifierQuotes( $oldName ); |
| 474 | |
| 475 | $temporary = $temporary ? 'TEMPORARY' : ''; |
| 476 | $query = new Query( |
| 477 | "CREATE $temporary TABLE $newNameE " . |
| 478 | "(LIKE $oldNameE INCLUDING DEFAULTS INCLUDING INDEXES)", |
| 479 | self::QUERY_PSEUDO_PERMANENT | self::QUERY_CHANGE_SCHEMA, |
| 480 | $temporary ? 'CREATE TEMPORARY' : 'CREATE', |
| 481 | // Use a dot to avoid double-prefixing in Database::getTempTableWrites() |
| 482 | '.' . $newName |
| 483 | ); |
| 484 | $ret = $this->query( $query, $fname ); |
| 485 | if ( !$ret ) { |
| 486 | return $ret; |
| 487 | } |
| 488 | |
| 489 | $sql = 'SELECT attname FROM pg_class c' |
| 490 | . ' JOIN pg_namespace n ON (n.oid = c.relnamespace)' |
| 491 | . ' JOIN pg_attribute a ON (a.attrelid = c.oid)' |
| 492 | . ' JOIN pg_attrdef d ON (c.oid=d.adrelid and a.attnum=d.adnum)' |
| 493 | . ' WHERE relkind = \'r\'' |
| 494 | . ' AND nspname = ' . $this->addQuotes( $this->getCoreSchema() ) |
| 495 | . ' AND relname = ' . $this->addQuotes( $oldName ) |
| 496 | . ' AND pg_get_expr(adbin, adrelid) LIKE \'nextval(%\''; |
| 497 | $query = new Query( |
| 498 | $sql, |
| 499 | self::QUERY_IGNORE_DBO_TRX | self::QUERY_CHANGE_NONE, |
| 500 | 'SELECT' |
| 501 | ); |
| 502 | |
| 503 | $res = $this->query( $query, $fname ); |
| 504 | $row = $res->fetchObject(); |
| 505 | if ( $row ) { |
| 506 | $field = $row->attname; |
| 507 | $newSeq = "{$newName}_{$field}_seq"; |
| 508 | $fieldE = $this->platform->addIdentifierQuotes( $field ); |
| 509 | $newSeqE = $this->platform->addIdentifierQuotes( $newSeq ); |
| 510 | $newSeqQ = $this->addQuotes( $newSeq ); |
| 511 | $query = new Query( |
| 512 | "CREATE $temporary SEQUENCE $newSeqE OWNED BY $newNameE.$fieldE", |
| 513 | self::QUERY_CHANGE_SCHEMA, |
| 514 | 'CREATE', |
| 515 | // Do not treat this is as a table modification on top of the CREATE above. |
| 516 | null |
| 517 | ); |
| 518 | $this->query( $query, $fname ); |
| 519 | $query = new Query( |
| 520 | "ALTER TABLE $newNameE ALTER COLUMN $fieldE SET DEFAULT nextval({$newSeqQ}::regclass)", |
| 521 | self::QUERY_CHANGE_SCHEMA, |
| 522 | 'ALTER', |
| 523 | // Do not treat this is as a table modification on top of the CREATE above. |
| 524 | null |
| 525 | ); |
| 526 | $this->query( $query, $fname ); |
| 527 | } |
| 528 | |
| 529 | return $ret; |
| 530 | } |
| 531 | |
| 532 | public function truncateTable( $table, $fname = __METHOD__ ) { |
| 533 | $sql = "TRUNCATE TABLE " . $this->tableName( $table ) . " RESTART IDENTITY"; |
| 534 | $query = new Query( $sql, self::QUERY_CHANGE_SCHEMA, 'TRUNCATE', $table ); |
| 535 | $this->query( $query, $fname ); |
| 536 | } |
| 537 | |
| 538 | /** |
| 539 | * @param string $prefix Only show tables with this prefix, e.g. mw_ |
| 540 | * @param string $fname Calling function name |
| 541 | * @return string[] |
| 542 | * @suppress SecurityCheck-SQLInjection array_map not recognized T204911 |
| 543 | */ |
| 544 | public function listTables( $prefix = '', $fname = __METHOD__ ) { |
| 545 | $eschemas = implode( ',', array_map( $this->addQuotes( ... ), $this->getCoreSchemas() ) ); |
| 546 | $query = new Query( |
| 547 | "SELECT DISTINCT tablename FROM pg_tables WHERE schemaname IN ($eschemas)", |
| 548 | self::QUERY_IGNORE_DBO_TRX | self::QUERY_CHANGE_NONE, |
| 549 | 'SELECT' |
| 550 | ); |
| 551 | $result = $this->query( $query, $fname ); |
| 552 | $endArray = []; |
| 553 | |
| 554 | foreach ( $result as $table ) { |
| 555 | $vars = get_object_vars( $table ); |
| 556 | $table = array_pop( $vars ); |
| 557 | if ( $prefix == '' || strpos( $table, $prefix ) === 0 ) { |
| 558 | $endArray[] = $table; |
| 559 | } |
| 560 | } |
| 561 | |
| 562 | return $endArray; |
| 563 | } |
| 564 | |
| 565 | /** |
| 566 | * Posted by cc[plus]php[at]c2se[dot]com on 25-Mar-2009 09:12 |
| 567 | * to https://www.php.net/manual/en/ref.pgsql.php |
| 568 | * |
| 569 | * Parsing a postgres array can be a tricky problem, he's my |
| 570 | * take on this, it handles multi-dimensional arrays plus |
| 571 | * escaping using a nasty regexp to determine the limits of each |
| 572 | * data-item. |
| 573 | * |
| 574 | * This should really be handled by PHP PostgreSQL module |
| 575 | * |
| 576 | * @since 1.19 |
| 577 | * @param string $text Postgreql array returned in a text form like {a,b} |
| 578 | * @param string[] &$output |
| 579 | * @param int|false $limit |
| 580 | * @param int $offset |
| 581 | * @return string[] |
| 582 | */ |
| 583 | private function pg_array_parse( $text, &$output, $limit = false, $offset = 1 ) { |
| 584 | if ( $limit === false ) { |
| 585 | $limit = strlen( $text ) - 1; |
| 586 | $output = []; |
| 587 | } |
| 588 | if ( $text == '{}' ) { |
| 589 | return $output; |
| 590 | } |
| 591 | do { |
| 592 | if ( $text[$offset] != '{' ) { |
| 593 | preg_match( "/(\\{?\"([^\"\\\\]|\\\\.)*\"|[^,{}]+)+([,}]+)/", |
| 594 | $text, $match, 0, $offset ); |
| 595 | $offset += strlen( $match[0] ); |
| 596 | $output[] = ( $match[1][0] != '"' |
| 597 | ? $match[1] |
| 598 | : stripcslashes( substr( $match[1], 1, -1 ) ) ); |
| 599 | if ( $match[3] == '},' ) { |
| 600 | return $output; |
| 601 | } |
| 602 | } else { |
| 603 | $offset = $this->pg_array_parse( $text, $output, $limit, $offset + 1 ); |
| 604 | } |
| 605 | } while ( $limit > $offset ); |
| 606 | |
| 607 | return $output; |
| 608 | } |
| 609 | |
| 610 | public function getSoftwareLink() { |
| 611 | return '[{{int:version-db-postgres-url}} PostgreSQL]'; |
| 612 | } |
| 613 | |
| 614 | /** |
| 615 | * Return current schema (executes SELECT current_schema()) |
| 616 | * Needs transaction |
| 617 | * |
| 618 | * @since 1.19 |
| 619 | * @return string Default schema for the current session |
| 620 | */ |
| 621 | public function getCurrentSchema() { |
| 622 | $query = new Query( |
| 623 | "SELECT current_schema()", |
| 624 | self::QUERY_IGNORE_DBO_TRX | self::QUERY_CHANGE_NONE, |
| 625 | 'SELECT' |
| 626 | ); |
| 627 | $res = $this->query( $query, __METHOD__ ); |
| 628 | $row = $res->fetchRow(); |
| 629 | |
| 630 | return $row[0]; |
| 631 | } |
| 632 | |
| 633 | /** |
| 634 | * Return list of schemas which are accessible without schema name |
| 635 | * This is list does not contain magic keywords like "$user" |
| 636 | * Needs transaction |
| 637 | * |
| 638 | * @see getSearchPath() |
| 639 | * @see setSearchPath() |
| 640 | * @since 1.19 |
| 641 | * @return array List of actual schemas for the current session |
| 642 | */ |
| 643 | public function getSchemas() { |
| 644 | $query = new Query( |
| 645 | "SELECT current_schemas(false)", |
| 646 | self::QUERY_IGNORE_DBO_TRX | self::QUERY_CHANGE_NONE, |
| 647 | 'SELECT' |
| 648 | ); |
| 649 | $res = $this->query( $query, __METHOD__ ); |
| 650 | $row = $res->fetchRow(); |
| 651 | $schemas = []; |
| 652 | |
| 653 | /* PHP pgsql support does not support array type, "{a,b}" string is returned */ |
| 654 | |
| 655 | return $this->pg_array_parse( $row[0], $schemas ); |
| 656 | } |
| 657 | |
| 658 | /** |
| 659 | * Return search patch for schemas |
| 660 | * This is different from getSchemas() since it contain magic keywords |
| 661 | * (like "$user"). |
| 662 | * Needs transaction |
| 663 | * |
| 664 | * @since 1.19 |
| 665 | * @return array How to search for table names schemas for the current user |
| 666 | */ |
| 667 | public function getSearchPath() { |
| 668 | $query = new Query( |
| 669 | "SHOW search_path", |
| 670 | self::QUERY_IGNORE_DBO_TRX | self::QUERY_CHANGE_NONE, |
| 671 | 'SHOW' |
| 672 | ); |
| 673 | $res = $this->query( $query, __METHOD__ ); |
| 674 | $row = $res->fetchRow(); |
| 675 | |
| 676 | /* PostgreSQL returns SHOW values as strings */ |
| 677 | |
| 678 | return explode( ",", $row[0] ); |
| 679 | } |
| 680 | |
| 681 | /** |
| 682 | * Update search_path, values should already be sanitized |
| 683 | * Values may contain magic keywords like "$user" |
| 684 | * @since 1.19 |
| 685 | * |
| 686 | * @param string[] $search_path List of schemas to be searched by default |
| 687 | */ |
| 688 | private function setSearchPath( $search_path ) { |
| 689 | $query = new Query( |
| 690 | "SET search_path = " . implode( ", ", $search_path ), |
| 691 | self::QUERY_CHANGE_TRX, |
| 692 | 'SET' |
| 693 | ); |
| 694 | $this->query( $query, __METHOD__ ); |
| 695 | } |
| 696 | |
| 697 | /** |
| 698 | * Determine default schema for the current application |
| 699 | * Adjust this session schema search path if desired schema exists |
| 700 | * and is not already there. |
| 701 | * |
| 702 | * We need to have name of the core schema stored to be able |
| 703 | * to query database metadata. |
| 704 | * |
| 705 | * This will be also called by the installer after the schema is created |
| 706 | * |
| 707 | * @since 1.19 |
| 708 | * |
| 709 | * @param string|null $desiredSchema |
| 710 | */ |
| 711 | public function determineCoreSchema( $desiredSchema ) { |
| 712 | if ( $this->trxLevel() ) { |
| 713 | // We do not want the schema selection to change on ROLLBACK or INSERT SELECT. |
| 714 | // See https://www.postgresql.org/docs/8.3/sql-set.html |
| 715 | throw new DBUnexpectedError( |
| 716 | $this, |
| 717 | __METHOD__ . ": a transaction is currently active" |
| 718 | ); |
| 719 | } |
| 720 | |
| 721 | if ( $this->schemaExists( $desiredSchema ) ) { |
| 722 | if ( in_array( $desiredSchema, $this->getSchemas() ) ) { |
| 723 | $this->platform->setCoreSchema( $desiredSchema ); |
| 724 | $this->logger->debug( |
| 725 | "Schema \"" . $desiredSchema . "\" already in the search path\n" ); |
| 726 | } else { |
| 727 | // Prepend the desired schema to the search path (T17816) |
| 728 | $search_path = $this->getSearchPath(); |
| 729 | array_unshift( $search_path, $this->platform->addIdentifierQuotes( $desiredSchema ) ); |
| 730 | $this->setSearchPath( $search_path ); |
| 731 | $this->platform->setCoreSchema( $desiredSchema ); |
| 732 | $this->logger->debug( |
| 733 | "Schema \"" . $desiredSchema . "\" added to the search path\n" ); |
| 734 | } |
| 735 | } else { |
| 736 | $this->platform->setCoreSchema( $this->getCurrentSchema() ); |
| 737 | $this->logger->debug( |
| 738 | "Schema \"" . $desiredSchema . "\" not found, using current \"" . |
| 739 | $this->getCoreSchema() . "\"\n" ); |
| 740 | } |
| 741 | } |
| 742 | |
| 743 | /** |
| 744 | * Return schema name for core application tables |
| 745 | * |
| 746 | * @since 1.19 |
| 747 | * @return string Core schema name |
| 748 | */ |
| 749 | public function getCoreSchema() { |
| 750 | return $this->platform->getCoreSchema(); |
| 751 | } |
| 752 | |
| 753 | /** |
| 754 | * Return schema names for temporary tables and core application tables |
| 755 | * |
| 756 | * @since 1.31 |
| 757 | * @return string[] schema names |
| 758 | */ |
| 759 | public function getCoreSchemas() { |
| 760 | if ( $this->tempSchema ) { |
| 761 | return [ $this->tempSchema, $this->getCoreSchema() ]; |
| 762 | } |
| 763 | $query = new Query( |
| 764 | "SELECT nspname FROM pg_catalog.pg_namespace n WHERE n.oid = pg_my_temp_schema()", |
| 765 | self::QUERY_IGNORE_DBO_TRX | self::QUERY_CHANGE_NONE, |
| 766 | 'SELECT' |
| 767 | ); |
| 768 | $res = $this->query( $query, __METHOD__ ); |
| 769 | $row = $res->fetchObject(); |
| 770 | if ( $row ) { |
| 771 | $this->tempSchema = $row->nspname; |
| 772 | return [ $this->tempSchema, $this->getCoreSchema() ]; |
| 773 | } |
| 774 | |
| 775 | return [ $this->getCoreSchema() ]; |
| 776 | } |
| 777 | |
| 778 | public function getServerVersion() { |
| 779 | if ( $this->numericVersion === null ) { |
| 780 | // Works on PG 7.4+ |
| 781 | $this->numericVersion = pg_version( $this->getBindingHandle() )['server']; |
| 782 | } |
| 783 | |
| 784 | return $this->numericVersion; |
| 785 | } |
| 786 | |
| 787 | /** |
| 788 | * Query whether a given relation exists (in the given schema, or the |
| 789 | * default mw one if not given) |
| 790 | * @param string $table |
| 791 | * @param array|string $types |
| 792 | * @return bool |
| 793 | */ |
| 794 | private function relationExists( $table, $types ) { |
| 795 | if ( !is_array( $types ) ) { |
| 796 | $types = [ $types ]; |
| 797 | } |
| 798 | $schemas = $this->getCoreSchemas(); |
| 799 | $components = $this->platform->qualifiedTableComponents( $table ); |
| 800 | $etable = $this->addQuotes( end( $components ) ); |
| 801 | foreach ( $schemas as $schema ) { |
| 802 | $eschema = $this->addQuotes( $schema ); |
| 803 | $sql = "SELECT 1 FROM pg_catalog.pg_class c, pg_catalog.pg_namespace n " |
| 804 | . "WHERE c.relnamespace = n.oid AND c.relname = $etable AND n.nspname = $eschema " |
| 805 | . "AND c.relkind IN ('" . implode( "','", $types ) . "')"; |
| 806 | $query = new Query( |
| 807 | $sql, |
| 808 | self::QUERY_IGNORE_DBO_TRX | self::QUERY_CHANGE_NONE, |
| 809 | 'SELECT' |
| 810 | ); |
| 811 | $res = $this->query( $query, __METHOD__ ); |
| 812 | if ( $res && $res->numRows() ) { |
| 813 | return true; |
| 814 | } |
| 815 | } |
| 816 | |
| 817 | return false; |
| 818 | } |
| 819 | |
| 820 | public function tableExists( $table, $fname = __METHOD__ ) { |
| 821 | return $this->relationExists( $table, [ 'r', 'v' ] ); |
| 822 | } |
| 823 | |
| 824 | public function sequenceExists( $sequence ) { |
| 825 | return $this->relationExists( $sequence, 'S' ); |
| 826 | } |
| 827 | |
| 828 | public function constraintExists( $table, $constraint ) { |
| 829 | foreach ( $this->getCoreSchemas() as $schema ) { |
| 830 | $sql = sprintf( "SELECT 1 FROM information_schema.table_constraints " . |
| 831 | "WHERE constraint_schema = %s AND table_name = %s AND constraint_name = %s", |
| 832 | $this->addQuotes( $schema ), |
| 833 | $this->addQuotes( $table ), |
| 834 | $this->addQuotes( $constraint ) |
| 835 | ); |
| 836 | $query = new Query( |
| 837 | $sql, |
| 838 | self::QUERY_IGNORE_DBO_TRX | self::QUERY_CHANGE_NONE, |
| 839 | 'SELECT' |
| 840 | ); |
| 841 | $res = $this->query( $query, __METHOD__ ); |
| 842 | if ( $res && $res->numRows() ) { |
| 843 | return true; |
| 844 | } |
| 845 | } |
| 846 | return false; |
| 847 | } |
| 848 | |
| 849 | /** |
| 850 | * Query whether a given schema exists. Returns true if it does, false if it doesn't. |
| 851 | * @param string|null $schema |
| 852 | * @return bool |
| 853 | */ |
| 854 | public function schemaExists( $schema ) { |
| 855 | if ( !strlen( $schema ?? '' ) ) { |
| 856 | return false; // short-circuit |
| 857 | } |
| 858 | $query = new Query( |
| 859 | "SELECT 1 FROM pg_catalog.pg_namespace " . |
| 860 | "WHERE nspname = " . $this->addQuotes( $schema ) . " LIMIT 1", |
| 861 | self::QUERY_IGNORE_DBO_TRX | self::QUERY_CHANGE_NONE, |
| 862 | 'SELECT' |
| 863 | ); |
| 864 | $res = $this->query( $query, __METHOD__ ); |
| 865 | |
| 866 | return ( $res->numRows() > 0 ); |
| 867 | } |
| 868 | |
| 869 | /** |
| 870 | * Returns true if a given role (i.e. user) exists, false otherwise. |
| 871 | * @param string $roleName |
| 872 | * @return bool |
| 873 | */ |
| 874 | public function roleExists( $roleName ) { |
| 875 | $query = new Query( |
| 876 | "SELECT 1 FROM pg_catalog.pg_roles " . |
| 877 | "WHERE rolname = " . $this->addQuotes( $roleName ) . " LIMIT 1", |
| 878 | self::QUERY_IGNORE_DBO_TRX | self::QUERY_CHANGE_NONE, |
| 879 | 'SELECT' |
| 880 | ); |
| 881 | $res = $this->query( $query, __METHOD__ ); |
| 882 | |
| 883 | return ( $res->numRows() > 0 ); |
| 884 | } |
| 885 | |
| 886 | /** |
| 887 | * @param string $table |
| 888 | * @param string $field |
| 889 | * @return PostgresField|null |
| 890 | */ |
| 891 | public function fieldInfo( $table, $field ) { |
| 892 | return PostgresField::fromText( $this, $table, $field ); |
| 893 | } |
| 894 | |
| 895 | public function encodeBlob( $b ) { |
| 896 | $conn = $this->getBindingHandle(); |
| 897 | |
| 898 | return new PostgresBlob( pg_escape_bytea( $conn, $b ) ); |
| 899 | } |
| 900 | |
| 901 | public function decodeBlob( $b ) { |
| 902 | if ( $b instanceof PostgresBlob ) { |
| 903 | $b = $b->fetch(); |
| 904 | } elseif ( $b instanceof Blob ) { |
| 905 | return $b->fetch(); |
| 906 | } |
| 907 | |
| 908 | return pg_unescape_bytea( $b ); |
| 909 | } |
| 910 | |
| 911 | public function strencode( $s ) { |
| 912 | // Should not be called by us |
| 913 | return pg_escape_string( $this->getBindingHandle(), (string)$s ); |
| 914 | } |
| 915 | |
| 916 | public function addQuotes( $s ) { |
| 917 | if ( $s instanceof RawSQLValue ) { |
| 918 | return $s->toSql(); |
| 919 | } |
| 920 | $conn = $this->getBindingHandle(); |
| 921 | |
| 922 | if ( $s === null ) { |
| 923 | return 'NULL'; |
| 924 | } elseif ( is_bool( $s ) ) { |
| 925 | return (string)intval( $s ); |
| 926 | } elseif ( is_int( $s ) ) { |
| 927 | return (string)$s; |
| 928 | } elseif ( $s instanceof Blob ) { |
| 929 | if ( $s instanceof PostgresBlob ) { |
| 930 | $s = $s->fetch(); |
| 931 | } else { |
| 932 | $s = pg_escape_bytea( $conn, $s->fetch() ); |
| 933 | } |
| 934 | return "'$s'"; |
| 935 | } |
| 936 | |
| 937 | return "'" . pg_escape_string( $conn, (string)$s ) . "'"; |
| 938 | } |
| 939 | |
| 940 | public function streamStatementEnd( &$sql, &$newLine ) { |
| 941 | # Allow dollar quoting for function declarations |
| 942 | if ( str_starts_with( $newLine, '$mw$' ) ) { |
| 943 | if ( $this->delimiter ) { |
| 944 | $this->delimiter = false; |
| 945 | } else { |
| 946 | $this->delimiter = ';'; |
| 947 | } |
| 948 | } |
| 949 | |
| 950 | return parent::streamStatementEnd( $sql, $newLine ); |
| 951 | } |
| 952 | |
| 953 | public function doLockIsFree( string $lockName, string $method ) { |
| 954 | $query = new Query( |
| 955 | $this->platform->lockIsFreeSQLText( $lockName ), |
| 956 | self::QUERY_CHANGE_LOCKS, |
| 957 | 'SELECT' |
| 958 | ); |
| 959 | $res = $this->query( $query, $method ); |
| 960 | $row = $res->fetchObject(); |
| 961 | |
| 962 | return (bool)$row->unlocked; |
| 963 | } |
| 964 | |
| 965 | public function doLock( string $lockName, string $method, int $timeout ) { |
| 966 | $query = new Query( |
| 967 | $this->platform->lockSQLText( $lockName, $timeout ), |
| 968 | self::QUERY_CHANGE_LOCKS, |
| 969 | 'SELECT' |
| 970 | ); |
| 971 | |
| 972 | $acquired = null; |
| 973 | $loop = new WaitConditionLoop( |
| 974 | function () use ( $query, $method, &$acquired ) { |
| 975 | $res = $this->query( $query, $method ); |
| 976 | $row = $res->fetchObject(); |
| 977 | |
| 978 | if ( $row->acquired !== null ) { |
| 979 | $acquired = (float)$row->acquired; |
| 980 | |
| 981 | return WaitConditionLoop::CONDITION_REACHED; |
| 982 | } |
| 983 | |
| 984 | return WaitConditionLoop::CONDITION_CONTINUE; |
| 985 | }, |
| 986 | $timeout |
| 987 | ); |
| 988 | $loop->invoke(); |
| 989 | |
| 990 | return $acquired; |
| 991 | } |
| 992 | |
| 993 | public function doUnlock( string $lockName, string $method ) { |
| 994 | $query = new Query( |
| 995 | $this->platform->unlockSQLText( $lockName ), |
| 996 | self::QUERY_CHANGE_LOCKS, |
| 997 | 'SELECT' |
| 998 | ); |
| 999 | $result = $this->query( $query, $method ); |
| 1000 | $row = $result->fetchObject(); |
| 1001 | |
| 1002 | return (bool)$row->released; |
| 1003 | } |
| 1004 | |
| 1005 | protected function doFlushSession( $fname ) { |
| 1006 | $flags = self::QUERY_CHANGE_LOCKS | self::QUERY_NO_RETRY; |
| 1007 | |
| 1008 | // https://www.postgresql.org/docs/9.1/functions-admin.html |
| 1009 | $sql = "SELECT pg_advisory_unlock_all()"; |
| 1010 | $query = new Query( $sql, $flags, 'UNLOCK' ); |
| 1011 | $qs = $this->executeQuery( $query, __METHOD__, $flags ); |
| 1012 | if ( $qs->res === false ) { |
| 1013 | $this->reportQueryError( $qs->message, $qs->code, $sql, $fname, true ); |
| 1014 | } |
| 1015 | } |
| 1016 | |
| 1017 | public function serverIsReadOnly() { |
| 1018 | $query = new Query( |
| 1019 | "SHOW default_transaction_read_only", |
| 1020 | self::QUERY_IGNORE_DBO_TRX | self::QUERY_CHANGE_NONE, |
| 1021 | 'SHOW' |
| 1022 | ); |
| 1023 | $res = $this->query( $query, __METHOD__ ); |
| 1024 | $row = $res->fetchObject(); |
| 1025 | |
| 1026 | return $row && strtolower( $row->default_transaction_read_only ) === 'on'; |
| 1027 | } |
| 1028 | |
| 1029 | protected function getInsertIdColumnForUpsert( $table ) { |
| 1030 | $column = null; |
| 1031 | |
| 1032 | $flags = self::QUERY_IGNORE_DBO_TRX | self::QUERY_CHANGE_NONE; |
| 1033 | $components = $this->platform->qualifiedTableComponents( $table ); |
| 1034 | $encTable = $this->addQuotes( end( $components ) ); |
| 1035 | foreach ( $this->getCoreSchemas() as $schema ) { |
| 1036 | $encSchema = $this->addQuotes( $schema ); |
| 1037 | $query = new Query( |
| 1038 | "SELECT column_name,data_type,column_default " . |
| 1039 | "FROM information_schema.columns " . |
| 1040 | "WHERE table_name = $encTable AND table_schema = $encSchema", |
| 1041 | self::QUERY_IGNORE_DBO_TRX | self::QUERY_CHANGE_NONE, |
| 1042 | 'SELECT' |
| 1043 | ); |
| 1044 | $res = $this->query( $query, __METHOD__ ); |
| 1045 | if ( $res->numRows() ) { |
| 1046 | foreach ( $res as $row ) { |
| 1047 | if ( |
| 1048 | $row->column_default !== null && |
| 1049 | str_starts_with( $row->column_default, "nextval(" ) && |
| 1050 | in_array( $row->data_type, [ 'integer', 'bigint' ], true ) |
| 1051 | ) { |
| 1052 | $column = $row->column_name; |
| 1053 | } |
| 1054 | } |
| 1055 | break; |
| 1056 | } |
| 1057 | } |
| 1058 | |
| 1059 | return $column; |
| 1060 | } |
| 1061 | |
| 1062 | public static function getAttributes() { |
| 1063 | return [ self::ATTR_SCHEMAS_AS_TABLE_GROUPS => true ]; |
| 1064 | } |
| 1065 | } |