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316 lines
9.6 KiB
316 lines
9.6 KiB
<?php
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/**
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* @copyright Copyright (c) 2016, ownCloud, Inc.
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*
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* @author Christoph Wurst <christoph@winzerhof-wurst.at>
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* @author Joas Schilling <coding@schilljs.com>
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* @author martin-rueegg <martin.rueegg@metaworx.ch>
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* @author Morris Jobke <hey@morrisjobke.de>
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* @author Robin Appelman <robin@icewind.nl>
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* @author Roeland Jago Douma <roeland@famdouma.nl>
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* @author tbelau666 <thomas.belau@gmx.de>
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* @author Thomas Müller <thomas.mueller@tmit.eu>
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* @author Victor Dubiniuk <dubiniuk@owncloud.com>
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* @author Vincent Petry <pvince81@owncloud.com>
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*
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* @license AGPL-3.0
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*
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* This code is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License, version 3,
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* as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License, version 3,
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* along with this program. If not, see <http://www.gnu.org/licenses/>
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*
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*/
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namespace OC\DB;
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use Doctrine\DBAL\DBALException;
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use Doctrine\DBAL\Schema\Comparator;
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use Doctrine\DBAL\Schema\Index;
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use Doctrine\DBAL\Schema\Schema;
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use Doctrine\DBAL\Schema\SchemaConfig;
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use Doctrine\DBAL\Schema\Table;
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use Doctrine\DBAL\Types\StringType;
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use Doctrine\DBAL\Types\Type;
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use OCP\IConfig;
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use OCP\Security\ISecureRandom;
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use Symfony\Component\EventDispatcher\EventDispatcherInterface;
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use Symfony\Component\EventDispatcher\GenericEvent;
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class Migrator {
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/** @var \Doctrine\DBAL\Connection */
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protected $connection;
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/** @var ISecureRandom */
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private $random;
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/** @var IConfig */
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protected $config;
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/** @var EventDispatcherInterface */
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private $dispatcher;
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/** @var bool */
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private $noEmit = false;
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/**
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* @param \Doctrine\DBAL\Connection $connection
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* @param ISecureRandom $random
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* @param IConfig $config
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* @param EventDispatcherInterface $dispatcher
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*/
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public function __construct(\Doctrine\DBAL\Connection $connection,
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ISecureRandom $random,
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IConfig $config,
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EventDispatcherInterface $dispatcher = null) {
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$this->connection = $connection;
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$this->random = $random;
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$this->config = $config;
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$this->dispatcher = $dispatcher;
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}
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/**
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* @param \Doctrine\DBAL\Schema\Schema $targetSchema
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*/
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public function migrate(Schema $targetSchema) {
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$this->noEmit = true;
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$this->applySchema($targetSchema);
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}
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/**
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* @param \Doctrine\DBAL\Schema\Schema $targetSchema
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* @return string
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*/
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public function generateChangeScript(Schema $targetSchema) {
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$schemaDiff = $this->getDiff($targetSchema, $this->connection);
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$script = '';
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$sqls = $schemaDiff->toSql($this->connection->getDatabasePlatform());
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foreach ($sqls as $sql) {
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$script .= $this->convertStatementToScript($sql);
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}
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return $script;
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}
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/**
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* @param Schema $targetSchema
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* @throws \OC\DB\MigrationException
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*/
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public function checkMigrate(Schema $targetSchema) {
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$this->noEmit = true;
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/**@var \Doctrine\DBAL\Schema\Table[] $tables */
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$tables = $targetSchema->getTables();
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$filterExpression = $this->getFilterExpression();
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$this->connection->getConfiguration()->
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setFilterSchemaAssetsExpression($filterExpression);
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$existingTables = $this->connection->getSchemaManager()->listTableNames();
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$step = 0;
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foreach ($tables as $table) {
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if (strpos($table->getName(), '.')) {
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list(, $tableName) = explode('.', $table->getName());
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} else {
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$tableName = $table->getName();
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}
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$this->emitCheckStep($tableName, $step++, count($tables));
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// don't need to check for new tables
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if (array_search($tableName, $existingTables) !== false) {
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$this->checkTableMigrate($table);
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}
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}
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}
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/**
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* Create a unique name for the temporary table
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*
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* @param string $name
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* @return string
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*/
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protected function generateTemporaryTableName($name) {
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return $this->config->getSystemValue('dbtableprefix', 'oc_') . $name . '_' . $this->random->generate(13, ISecureRandom::CHAR_LOWER . ISecureRandom::CHAR_DIGITS);
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}
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/**
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* Check the migration of a table on a copy so we can detect errors before messing with the real table
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*
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* @param \Doctrine\DBAL\Schema\Table $table
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* @throws \OC\DB\MigrationException
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*/
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protected function checkTableMigrate(Table $table) {
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$name = $table->getName();
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$tmpName = $this->generateTemporaryTableName($name);
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$this->copyTable($name, $tmpName);
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//create the migration schema for the temporary table
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$tmpTable = $this->renameTableSchema($table, $tmpName);
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$schemaConfig = new SchemaConfig();
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$schemaConfig->setName($this->connection->getDatabase());
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$schema = new Schema([$tmpTable], [], $schemaConfig);
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try {
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$this->applySchema($schema);
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$this->dropTable($tmpName);
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} catch (DBALException $e) {
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// pgsql needs to commit it's failed transaction before doing anything else
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if ($this->connection->isTransactionActive()) {
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$this->connection->commit();
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}
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$this->dropTable($tmpName);
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throw new MigrationException($table->getName(), $e->getMessage());
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}
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}
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/**
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* @param \Doctrine\DBAL\Schema\Table $table
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* @param string $newName
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* @return \Doctrine\DBAL\Schema\Table
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*/
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protected function renameTableSchema(Table $table, $newName) {
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/**
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* @var \Doctrine\DBAL\Schema\Index[] $indexes
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*/
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$indexes = $table->getIndexes();
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$newIndexes = [];
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foreach ($indexes as $index) {
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if ($index->isPrimary()) {
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// do not rename primary key
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$indexName = $index->getName();
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} else {
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// avoid conflicts in index names
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$indexName = $this->config->getSystemValue('dbtableprefix', 'oc_') . $this->random->generate(13, ISecureRandom::CHAR_LOWER);
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}
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$newIndexes[] = new Index($indexName, $index->getColumns(), $index->isUnique(), $index->isPrimary());
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}
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// foreign keys are not supported so we just set it to an empty array
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return new Table($newName, $table->getColumns(), $newIndexes, [], 0, $table->getOptions());
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}
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public function createSchema() {
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$filterExpression = $this->getFilterExpression();
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$this->connection->getConfiguration()->setFilterSchemaAssetsExpression($filterExpression);
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return $this->connection->getSchemaManager()->createSchema();
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}
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/**
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* @param Schema $targetSchema
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* @param \Doctrine\DBAL\Connection $connection
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* @return \Doctrine\DBAL\Schema\SchemaDiff
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* @throws DBALException
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*/
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protected function getDiff(Schema $targetSchema, \Doctrine\DBAL\Connection $connection) {
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// adjust varchar columns with a length higher then getVarcharMaxLength to clob
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foreach ($targetSchema->getTables() as $table) {
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foreach ($table->getColumns() as $column) {
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if ($column->getType() instanceof StringType) {
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if ($column->getLength() > $connection->getDatabasePlatform()->getVarcharMaxLength()) {
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$column->setType(Type::getType('text'));
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$column->setLength(null);
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}
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}
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}
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}
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$filterExpression = $this->getFilterExpression();
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$this->connection->getConfiguration()->setFilterSchemaAssetsExpression($filterExpression);
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$sourceSchema = $connection->getSchemaManager()->createSchema();
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// remove tables we don't know about
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foreach ($sourceSchema->getTables() as $table) {
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if (!$targetSchema->hasTable($table->getName())) {
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$sourceSchema->dropTable($table->getName());
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}
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}
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// remove sequences we don't know about
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foreach ($sourceSchema->getSequences() as $table) {
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if (!$targetSchema->hasSequence($table->getName())) {
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$sourceSchema->dropSequence($table->getName());
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}
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}
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$comparator = new Comparator();
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return $comparator->compare($sourceSchema, $targetSchema);
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}
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/**
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* @param \Doctrine\DBAL\Schema\Schema $targetSchema
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* @param \Doctrine\DBAL\Connection $connection
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*/
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protected function applySchema(Schema $targetSchema, \Doctrine\DBAL\Connection $connection = null) {
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if (is_null($connection)) {
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$connection = $this->connection;
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}
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$schemaDiff = $this->getDiff($targetSchema, $connection);
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$connection->beginTransaction();
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$sqls = $schemaDiff->toSql($connection->getDatabasePlatform());
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$step = 0;
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foreach ($sqls as $sql) {
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$this->emit($sql, $step++, count($sqls));
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$connection->query($sql);
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}
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$connection->commit();
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}
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/**
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* @param string $sourceName
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* @param string $targetName
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*/
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protected function copyTable($sourceName, $targetName) {
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$quotedSource = $this->connection->quoteIdentifier($sourceName);
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$quotedTarget = $this->connection->quoteIdentifier($targetName);
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$this->connection->exec('CREATE TABLE ' . $quotedTarget . ' (LIKE ' . $quotedSource . ')');
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$this->connection->exec('INSERT INTO ' . $quotedTarget . ' SELECT * FROM ' . $quotedSource);
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}
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/**
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* @param string $name
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*/
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protected function dropTable($name) {
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$this->connection->exec('DROP TABLE ' . $this->connection->quoteIdentifier($name));
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}
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/**
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* @param $statement
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* @return string
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*/
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protected function convertStatementToScript($statement) {
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$script = $statement . ';';
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$script .= PHP_EOL;
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$script .= PHP_EOL;
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return $script;
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}
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protected function getFilterExpression() {
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return '/^' . preg_quote($this->config->getSystemValue('dbtableprefix', 'oc_')) . '/';
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}
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protected function emit($sql, $step, $max) {
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if ($this->noEmit) {
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return;
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}
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if (is_null($this->dispatcher)) {
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return;
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}
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$this->dispatcher->dispatch('\OC\DB\Migrator::executeSql', new GenericEvent($sql, [$step+1, $max]));
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}
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private function emitCheckStep($tableName, $step, $max) {
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if (is_null($this->dispatcher)) {
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return;
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}
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$this->dispatcher->dispatch('\OC\DB\Migrator::checkTable', new GenericEvent($tableName, [$step+1, $max]));
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}
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}
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