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<?php
/**
* @copyright Copyright (c) 2016, ownCloud, Inc.
*
* @author Christoph Wurst <christoph@winzerhof-wurst.at>
* @author Daniel Kesselberg <mail@danielkesselberg.de>
* @author Joas Schilling <coding@schilljs.com>
* @author Morris Jobke <hey@morrisjobke.de>
* @author Robin Appelman <robin@icewind.nl>
* @author Roeland Jago Douma <roeland@famdouma.nl>
* @author Thomas Müller <thomas.mueller@tmit.eu>
*
* @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\Connection;
use Doctrine\DBAL\Exception;
use Doctrine\DBAL\Platforms\MySQLPlatform;
use Doctrine\DBAL\Schema\AbstractAsset;
use Doctrine\DBAL\Schema\Schema;
use Doctrine\DBAL\Schema\SchemaDiff;
use Doctrine\DBAL\Types\StringType;
use Doctrine\DBAL\Types\Type;
use OCP\EventDispatcher\IEventDispatcher;
use OCP\IConfig;
use function preg_match;
class Migrator {
/** @var Connection */
protected $connection;
/** @var IConfig */
protected $config;
private ?IEventDispatcher $dispatcher;
/** @var bool */
private $noEmit = false;
public function __construct(Connection $connection,
IConfig $config,
?IEventDispatcher $dispatcher = null) {
$this->connection = $connection;
$this->config = $config;
$this->dispatcher = $dispatcher;
}
/**
* @throws Exception
*/
public function migrate(Schema $targetSchema) {
$this->noEmit = true;
$this->applySchema($targetSchema);
}
/**
* @return string
*/
public function generateChangeScript(Schema $targetSchema) {
$schemaDiff = $this->getDiff($targetSchema, $this->connection);
$script = '';
$sqls = $this->connection->getDatabasePlatform()->getAlterSchemaSQL($schemaDiff);
foreach ($sqls as $sql) {
$script .= $this->convertStatementToScript($sql);
}
return $script;
}
/**
* @throws Exception
*/
public function createSchema() {
$this->connection->getConfiguration()->setSchemaAssetsFilter(function ($asset) {
/** @var string|AbstractAsset $asset */
$filterExpression = $this->getFilterExpression();
if ($asset instanceof AbstractAsset) {
return preg_match($filterExpression, $asset->getName()) === 1;
}
return preg_match($filterExpression, $asset) === 1;
});
return $this->connection->createSchemaManager()->introspectSchema();
}
/**
* @return SchemaDiff
*/
protected function getDiff(Schema $targetSchema, Connection $connection) {
// Adjust STRING columns with a length higher than 4000 to TEXT (clob)
// for consistency between the supported databases and
// old vs. new installations.
foreach ($targetSchema->getTables() as $table) {
foreach ($table->getColumns() as $column) {
if ($column->getType() instanceof StringType) {
if ($column->getLength() > 4000) {
$column->setType(Type::getType('text'));
$column->setLength(null);
}
}
}
}
$this->connection->getConfiguration()->setSchemaAssetsFilter(function ($asset) {
/** @var string|AbstractAsset $asset */
$filterExpression = $this->getFilterExpression();
if ($asset instanceof AbstractAsset) {
return preg_match($filterExpression, $asset->getName()) === 1;
}
return preg_match($filterExpression, $asset) === 1;
});
$sourceSchema = $connection->createSchemaManager()->introspectSchema();
// remove tables we don't know about
foreach ($sourceSchema->getTables() as $table) {
if (!$targetSchema->hasTable($table->getName())) {
$sourceSchema->dropTable($table->getName());
}
}
// remove sequences we don't know about
foreach ($sourceSchema->getSequences() as $table) {
if (!$targetSchema->hasSequence($table->getName())) {
$sourceSchema->dropSequence($table->getName());
}
}
$comparator = $connection->createSchemaManager()->createComparator();
return $comparator->compareSchemas($sourceSchema, $targetSchema);
}
/**
* @throws Exception
*/
protected function applySchema(Schema $targetSchema, ?Connection $connection = null) {
if (is_null($connection)) {
$connection = $this->connection;
}
$schemaDiff = $this->getDiff($targetSchema, $connection);
if (!$connection->getDatabasePlatform() instanceof MySQLPlatform) {
$connection->beginTransaction();
}
$sqls = $connection->getDatabasePlatform()->getAlterSchemaSQL($schemaDiff);
$step = 0;
foreach ($sqls as $sql) {
$this->emit($sql, $step++, count($sqls));
$connection->executeQuery($sql);
}
if (!$connection->getDatabasePlatform() instanceof MySQLPlatform) {
$connection->commit();
}
}
/**
* @param $statement
* @return string
*/
protected function convertStatementToScript($statement) {
$script = $statement . ';';
$script .= PHP_EOL;
$script .= PHP_EOL;
return $script;
}
protected function getFilterExpression() {
return '/^' . preg_quote($this->config->getSystemValueString('dbtableprefix', 'oc_'), '/') . '/';
}
protected function emit(string $sql, int $step, int $max): void {
if ($this->noEmit) {
return;
}
if (is_null($this->dispatcher)) {
return;
}
$this->dispatcher->dispatchTyped(new MigratorExecuteSqlEvent($sql, $step, $max));
}
}
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