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| 1 | <?php |
| 2 | /** |
| 3 | * @license GPL-2.0-or-later |
| 4 | * @file |
| 5 | */ |
| 6 | namespace Wikimedia\Rdbms\Platform; |
| 7 | |
| 8 | use Wikimedia\Rdbms\DBLanguageError; |
| 9 | use Wikimedia\Rdbms\Query; |
| 10 | use Wikimedia\Timestamp\ConvertibleTimestamp; |
| 11 | use Wikimedia\Timestamp\TimestampFormat as TS; |
| 12 | |
| 13 | /** |
| 14 | * @since 1.39 |
| 15 | * @see ISQLPlatform |
| 16 | */ |
| 17 | class PostgresPlatform extends SQLPlatform { |
| 18 | private ?string $coreSchema = null; |
| 19 | |
| 20 | /** @inheritDoc */ |
| 21 | public function limitResult( $sql, $limit, $offset = false ) { |
| 22 | return "$sql LIMIT $limit " . ( is_numeric( $offset ) ? " OFFSET {$offset} " : '' ); |
| 23 | } |
| 24 | |
| 25 | /** @inheritDoc */ |
| 26 | public function buildConcat( $stringList ) { |
| 27 | return implode( ' || ', $stringList ); |
| 28 | } |
| 29 | |
| 30 | /** @inheritDoc */ |
| 31 | public function buildGroupConcat( $field, $delim ): string { |
| 32 | return "array_to_string(array_agg($field)," . $this->quoter->addQuotes( $delim ) . ')'; |
| 33 | } |
| 34 | |
| 35 | /** @inheritDoc */ |
| 36 | public function timestamp( $ts = 0 ) { |
| 37 | $ct = new ConvertibleTimestamp( $ts ); |
| 38 | |
| 39 | return $ct->getTimestamp( TS::POSTGRES ); |
| 40 | } |
| 41 | |
| 42 | /** @inheritDoc */ |
| 43 | public function buildStringCast( $field ) { |
| 44 | return $field . '::text'; |
| 45 | } |
| 46 | |
| 47 | /** @inheritDoc */ |
| 48 | public function implicitOrderby() { |
| 49 | return false; |
| 50 | } |
| 51 | |
| 52 | public function getCoreSchema(): string { |
| 53 | return $this->coreSchema; |
| 54 | } |
| 55 | |
| 56 | public function setCoreSchema( string $coreSchema ): void { |
| 57 | $this->coreSchema = $coreSchema; |
| 58 | } |
| 59 | |
| 60 | /** @inheritDoc */ |
| 61 | public function selectSQLText( |
| 62 | $tables, $vars, $conds = '', $fname = __METHOD__, $options = [], $join_conds = [] |
| 63 | ) { |
| 64 | if ( is_string( $options ) ) { |
| 65 | $options = [ $options ]; |
| 66 | } |
| 67 | |
| 68 | // Change the FOR UPDATE option as necessary based on the join conditions. Then pass |
| 69 | // to the parent function to get the actual SQL text. |
| 70 | // In Postgres when using FOR UPDATE, only the main table and tables that are inner joined |
| 71 | // can be locked. That means tables in an outer join cannot be FOR UPDATE locked. Trying to |
| 72 | // do so causes a DB error. This wrapper checks which tables can be locked and adjusts it |
| 73 | // accordingly. |
| 74 | // MySQL uses "ORDER BY NULL" as an optimization hint, but that is illegal in PostgreSQL. |
| 75 | if ( is_array( $options ) ) { |
| 76 | $forUpdateKey = array_search( 'FOR UPDATE', $options, true ); |
| 77 | if ( $forUpdateKey !== false && $join_conds ) { |
| 78 | unset( $options[$forUpdateKey] ); |
| 79 | $options['FOR UPDATE'] = []; |
| 80 | |
| 81 | $toCheck = $tables; |
| 82 | reset( $toCheck ); |
| 83 | while ( $toCheck ) { |
| 84 | $alias = key( $toCheck ); |
| 85 | $table = $toCheck[$alias]; |
| 86 | unset( $toCheck[$alias] ); |
| 87 | |
| 88 | if ( !is_string( $alias ) ) { |
| 89 | // No alias? Set it equal to the table name |
| 90 | $alias = $table; |
| 91 | } |
| 92 | |
| 93 | if ( !isset( $join_conds[$alias] ) || |
| 94 | !preg_match( '/^(?:LEFT|RIGHT|FULL)(?: OUTER)? JOIN$/i', $join_conds[$alias][0] ) |
| 95 | ) { |
| 96 | if ( is_array( $table ) ) { |
| 97 | // It's a parenthesized group, process all the tables inside the group. |
| 98 | $toCheck = array_merge( $toCheck, $table ); |
| 99 | } else { |
| 100 | // If an alias is declared, then any FOR UPDATE FOR must use it |
| 101 | $options['FOR UPDATE'][] = $alias; |
| 102 | } |
| 103 | } |
| 104 | } |
| 105 | } |
| 106 | |
| 107 | if ( |
| 108 | isset( $options['ORDER BY'] ) && |
| 109 | ( $options['ORDER BY'] == 'NULL' || $options['ORDER BY'] == [ 'NULL' ] ) |
| 110 | ) { |
| 111 | unset( $options['ORDER BY'] ); |
| 112 | } |
| 113 | } |
| 114 | |
| 115 | return parent::selectSQLText( $tables, $vars, $conds, $fname, $options, $join_conds ); |
| 116 | } |
| 117 | |
| 118 | /** @inheritDoc */ |
| 119 | protected function makeSelectOptions( array $options ) { |
| 120 | $preLimitTail = $postLimitTail = ''; |
| 121 | $startOpts = ''; |
| 122 | |
| 123 | $noKeyOptions = []; |
| 124 | foreach ( $options as $key => $option ) { |
| 125 | if ( is_numeric( $key ) ) { |
| 126 | $noKeyOptions[$option] = true; |
| 127 | } |
| 128 | } |
| 129 | |
| 130 | $preLimitTail .= $this->makeGroupByWithHaving( $options ); |
| 131 | |
| 132 | $preLimitTail .= $this->makeOrderBy( $options ); |
| 133 | |
| 134 | if ( isset( $options['FOR UPDATE'] ) ) { |
| 135 | $postLimitTail .= ' FOR UPDATE OF ' . implode( |
| 136 | ', ', |
| 137 | array_map( $this->addIdentifierQuotes( ... ), $options['FOR UPDATE'] ) |
| 138 | ); |
| 139 | } elseif ( isset( $noKeyOptions['FOR UPDATE'] ) ) { |
| 140 | $postLimitTail .= ' FOR UPDATE'; |
| 141 | } |
| 142 | |
| 143 | if ( isset( $noKeyOptions['DISTINCT'] ) || isset( $noKeyOptions['DISTINCTROW'] ) ) { |
| 144 | $startOpts .= 'DISTINCT'; |
| 145 | } |
| 146 | |
| 147 | return [ $startOpts, $preLimitTail, $postLimitTail ]; |
| 148 | } |
| 149 | |
| 150 | /** @inheritDoc */ |
| 151 | public function getDatabaseAndTableIdentifier( string $table ) { |
| 152 | $components = $this->qualifiedTableComponents( $table ); |
| 153 | switch ( count( $components ) ) { |
| 154 | case 1: |
| 155 | return [ $this->currentDomain->getDatabase(), $components[0] ]; |
| 156 | case 2: |
| 157 | return [ $this->currentDomain->getDatabase(), $components[1] ]; |
| 158 | case 3: |
| 159 | return [ $components[0], $components[2] ]; |
| 160 | default: |
| 161 | throw new DBLanguageError( 'Too many table components' ); |
| 162 | } |
| 163 | } |
| 164 | |
| 165 | /** @inheritDoc */ |
| 166 | protected function relationSchemaQualifier() { |
| 167 | if ( $this->coreSchema === $this->currentDomain->getSchema() ) { |
| 168 | // The schema to be used is now in the search path; no need for explicit qualification |
| 169 | return ''; |
| 170 | } |
| 171 | |
| 172 | return parent::relationSchemaQualifier(); |
| 173 | } |
| 174 | |
| 175 | /** @inheritDoc */ |
| 176 | public function makeInsertLists( array $rows, $aliasPrefix = '', array $typeByColumn = [] ) { |
| 177 | $firstRow = $rows[0]; |
| 178 | if ( !is_array( $firstRow ) || !$firstRow ) { |
| 179 | throw new DBLanguageError( 'Got an empty row list or empty row' ); |
| 180 | } |
| 181 | // List of columns that define the value tuple ordering |
| 182 | $tupleColumns = array_keys( $firstRow ); |
| 183 | |
| 184 | $valueTuples = []; |
| 185 | foreach ( $rows as $row ) { |
| 186 | $rowColumns = array_keys( $row ); |
| 187 | // VALUES(...) requires a uniform correspondence of (column => value) |
| 188 | if ( $rowColumns !== $tupleColumns ) { |
| 189 | throw new DBLanguageError( |
| 190 | 'All rows must specify the same columns in multi-row inserts. Found a row with (' . |
| 191 | implode( ', ', $rowColumns ) . ') ' . |
| 192 | 'instead of expected (' . implode( ', ', $tupleColumns ) . ') as in the first row' |
| 193 | ); |
| 194 | } |
| 195 | // Make the value tuple that defines this row |
| 196 | $typedRowValues = []; |
| 197 | foreach ( $row as $column => $value ) { |
| 198 | $type = $typeByColumn[$column] ?? null; |
| 199 | if ( $value === null ) { |
| 200 | $typedRowValues[] = 'NULL'; |
| 201 | } elseif ( $type !== null ) { |
| 202 | $typedRowValues[] = $this->quoter->addQuotes( $value ) . '::' . $type; |
| 203 | } else { |
| 204 | $typedRowValues[] = $this->quoter->addQuotes( $value ); |
| 205 | } |
| 206 | } |
| 207 | $valueTuples[] = '(' . implode( ',', $typedRowValues ) . ')'; |
| 208 | } |
| 209 | |
| 210 | $magicAliasFields = []; |
| 211 | foreach ( $tupleColumns as $column ) { |
| 212 | $magicAliasFields[] = $aliasPrefix . $column; |
| 213 | } |
| 214 | |
| 215 | return [ |
| 216 | $this->makeList( $tupleColumns, self::LIST_NAMES ), |
| 217 | implode( ',', $valueTuples ), |
| 218 | $this->makeList( $magicAliasFields, self::LIST_NAMES ) |
| 219 | ]; |
| 220 | } |
| 221 | |
| 222 | /** @inheritDoc */ |
| 223 | protected function makeInsertNonConflictingVerbAndOptions() { |
| 224 | return [ 'INSERT INTO', 'ON CONFLICT DO NOTHING' ]; |
| 225 | } |
| 226 | |
| 227 | /** @inheritDoc */ |
| 228 | protected function makeUpdateOptionsArray( $options ) { |
| 229 | $options = $this->normalizeOptions( $options ); |
| 230 | // PostgreSQL doesn't support anything like "ignore" for UPDATE. |
| 231 | $options = array_diff( $options, [ 'IGNORE' ] ); |
| 232 | |
| 233 | return parent::makeUpdateOptionsArray( $options ); |
| 234 | } |
| 235 | |
| 236 | /** @inheritDoc */ |
| 237 | public function isTransactableQuery( Query $sql ) { |
| 238 | return parent::isTransactableQuery( $sql ) && |
| 239 | !preg_match( '/^SELECT\s+pg_(try_|)advisory_\w+\(/', $sql->getSQL() ); |
| 240 | } |
| 241 | |
| 242 | /** @inheritDoc */ |
| 243 | public function lockSQLText( $lockName, $timeout ) { |
| 244 | // http://www.postgresql.org/docs/9.2/static/functions-admin.html#FUNCTIONS-ADVISORY-LOCKS |
| 245 | $key = $this->quoter->addQuotes( $this->bigintFromLockName( $lockName ) ); |
| 246 | return "SELECT (CASE WHEN pg_try_advisory_lock($key) " . |
| 247 | "THEN EXTRACT(epoch from clock_timestamp()) " . |
| 248 | "ELSE NULL " . |
| 249 | "END) AS acquired"; |
| 250 | } |
| 251 | |
| 252 | /** @inheritDoc */ |
| 253 | public function unlockSQLText( $lockName ) { |
| 254 | // http://www.postgresql.org/docs/9.2/static/functions-admin.html#FUNCTIONS-ADVISORY-LOCKS |
| 255 | $key = $this->quoter->addQuotes( $this->bigintFromLockName( $lockName ) ); |
| 256 | return "SELECT pg_advisory_unlock($key) AS released"; |
| 257 | } |
| 258 | |
| 259 | /** |
| 260 | * @param string $lockName |
| 261 | * @return string Integer |
| 262 | */ |
| 263 | private function bigintFromLockName( $lockName ) { |
| 264 | return \Wikimedia\base_convert( substr( sha1( $lockName ), 0, 15 ), 16, 10 ); |
| 265 | } |
| 266 | } |