Fix bigint handling on postgres

Signed-off-by: Joas Schilling <coding@schilljs.com>

2 files changed, 98 insertions, 0 deletions

diff --git a/lib/private/DB/ConnectionFactory.php b/lib/private/DB/ConnectionFactory.php
index d90d7737d40..8848f6db3b4 100644
--- a/lib/private/DB/ConnectionFactory.php
+++ b/lib/private/DB/ConnectionFactory.php
@@ -137,6 +137,10 @@ class ConnectionFactory {
 				}
 				unset($additionalConnectionParams['host']);
 				break;
+
+			case 'pgsql':
+				$additionalConnectionParams['platform'] = new OCPostgreSqlPlatform();
+				break;
 			case 'sqlite3':
 				$journalMode = $additionalConnectionParams['sqlite.journal_mode'];
 				$additionalConnectionParams['platform'] = new OCSqlitePlatform();
diff --git a/lib/private/DB/OCPostgreSqlPlatform.php b/lib/private/DB/OCPostgreSqlPlatform.php
new file mode 100644
index 00000000000..524a62c2beb
--- /dev/null
+++ b/lib/private/DB/OCPostgreSqlPlatform.php
@@ -0,0 +1,94 @@
+<?php
+/**
+ * @author Victor Dubiniuk <dubiniuk@owncloud.com>
+ *
+ * @copyright Copyright (c) 2017, ownCloud GmbH
+ * @license AGPL-3.0
+ *
+ * This code is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License, version 3,
+ * as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License, version 3,
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>
+ *
+ */
+
+namespace OC\DB;
+
+use Doctrine\DBAL\Platforms\PostgreSqlPlatform;
+use Doctrine\DBAL\Schema\ColumnDiff;
+use Doctrine\DBAL\Schema\TableDiff;
+use Doctrine\DBAL\Types\Type;
+
+class OCPostgreSqlPlatform extends PostgreSqlPlatform {
+
+	/**
+	 * {@inheritDoc}
+	 */
+	public function getAlterTableSQL(TableDiff $diff){
+		$queries = parent::getAlterTableSQL($diff);
+		foreach ($queries as $index => $sql){
+			// BIGSERIAL could not be used in statements altering column type
+			// That's why we replace it with BIGINT 
+			// see https://github.com/owncloud/core/pull/28364#issuecomment-315006853
+			if (preg_match('|(ALTER TABLE\s+\S+\s+ALTER\s+\S+\s+TYPE\s+)(BIGSERIAL)|i', $sql, $matches)) {
+				$alterTable = $matches[1];
+				$queries[$index] = $alterTable . 'BIGINT';
+			}
+
+			// Changing integer to bigint kills next autoincrement value
+			// see https://github.com/owncloud/core/pull/28364#issuecomment-315006853
+			if (preg_match('|ALTER TABLE\s+(\S+)\s+ALTER\s+(\S+)\s+DROP DEFAULT|i', $sql, $matches)) {
+				$queryColumnName = $matches[2];
+				$columnDiff = $this->findColumnDiffByName($diff, $queryColumnName);
+				if ($columnDiff && $this->shouldSkipDropDefault($columnDiff)) {
+					unset($queries[$index]);
+					continue;
+				}
+			}
+		}
+		
+		return $queries;
+	}
+
+	/**
+	 * We should NOT drop next sequence value if
+	 * - type was changed from INTEGER to BIGINT
+	 * - column keeps an autoincrement
+	 * - default value is kept NULL
+	 *
+	 * @param ColumnDiff $columnDiff
+	 * @return bool
+	 */
+	private function shouldSkipDropDefault(ColumnDiff $columnDiff) {
+		$column = $columnDiff->column;
+		$fromColumn = $columnDiff->fromColumn;
+		return $fromColumn->getType()->getName() === Type::INTEGER
+				&& $column->getType()->getName() === Type::BIGINT
+				&& $fromColumn->getDefault() === null
+				&& $column->getDefault() === null
+				&& $fromColumn->getAutoincrement()
+				&& $column->getAutoincrement();
+	}
+
+	/**
+	 * @param TableDiff $diff
+	 * @param string $name
+	 * @return  ColumnDiff | false
+	 */
+	private function findColumnDiffByName(TableDiff $diff, $name) {
+		foreach ($diff->changedColumns as $columnDiff) {
+			$oldColumnName = $columnDiff->getOldColumnName()->getQuotedName($this);
+			if ($oldColumnName === $name) {
+				return $columnDiff;
+			}
+		}
+		return false;
+	}
+}