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<?php
/**
* Copyright (c) 2014 Robin Appelman <icewind@owncloud.com>
* This file is licensed under the Affero General Public License version 3 or
* later.
* See the COPYING-README file.
*/
namespace OC\DB;
use \Doctrine\DBAL\DBALException;
use \Doctrine\DBAL\Schema\Index;
use \Doctrine\DBAL\Schema\Table;
use \Doctrine\DBAL\Schema\Schema;
use \Doctrine\DBAL\Schema\SchemaConfig;
use \Doctrine\DBAL\Schema\Comparator;
class Migrator {
/**
* @var \Doctrine\DBAL\Connection $connection
*/
protected $connection;
/**
* @param \Doctrine\DBAL\Connection $connection
*/
public function __construct(\Doctrine\DBAL\Connection $connection) {
$this->connection = $connection;
}
/**
* @param \Doctrine\DBAL\Schema\Schema $targetSchema
*/
public function migrate(Schema $targetSchema) {
$this->applySchema($targetSchema);
}
/**
* @param \Doctrine\DBAL\Schema\Schema $targetSchema
* @return string
*/
public function generateChangeScript(Schema $targetSchema) {
$schemaDiff = $this->getDiff($targetSchema, $this->connection);
$script = '';
$sqls = $schemaDiff->toSql($this->connection->getDatabasePlatform());
foreach ($sqls as $sql) {
$script .= $sql . ';';
$script .= PHP_EOL;
}
return $script;
}
/**
* @param Schema $targetSchema
* @throws \OC\DB\MigrationException
*/
public function checkMigrate(Schema $targetSchema) {
/**
* @var \Doctrine\DBAL\Schema\Table[] $tables
*/
$tables = $targetSchema->getTables();
$existingTables = $this->connection->getSchemaManager()->listTableNames();
foreach ($tables as $table) {
if (strpos($table->getName(), '.')) {
list(, $tableName) = explode('.', $table->getName());
} else {
$tableName = $table->getName();
}
// don't need to check for new tables
if (array_search($tableName, $existingTables) !== false) {
$this->checkTableMigrate($table);
}
}
}
/**
* Create a unique name for the temporary table
*
* @param string $name
* @return string
*/
protected function generateTemporaryTableName($name) {
return 'oc_' . $name . '_' . \OCP\Util::generateRandomBytes(13);
}
/**
* Check the migration of a table on a copy so we can detect errors before messing with the real table
*
* @param \Doctrine\DBAL\Schema\Table $table
* @throws \OC\DB\MigrationException
*/
protected function checkTableMigrate(Table $table) {
$name = $table->getName();
$tmpName = $this->generateTemporaryTableName($name);
$this->copyTable($name, $tmpName);
//create the migration schema for the temporary table
$tmpTable = $this->renameTableSchema($table, $tmpName);
$schemaConfig = new SchemaConfig();
$schemaConfig->setName($this->connection->getDatabase());
$schema = new Schema(array($tmpTable), array(), $schemaConfig);
try {
$this->applySchema($schema);
$this->dropTable($tmpName);
} catch (DBALException $e) {
// pgsql needs to commit it's failed transaction before doing anything else
if ($this->connection->isTransactionActive()) {
$this->connection->commit();
}
$this->dropTable($tmpName);
throw new MigrationException($table->getName(), $e->getMessage());
}
}
/**
* @param \Doctrine\DBAL\Schema\Table $table
* @param string $newName
* @return \Doctrine\DBAL\Schema\Table
*/
protected function renameTableSchema(Table $table, $newName) {
/**
* @var \Doctrine\DBAL\Schema\Index[] $indexes
*/
$indexes = $table->getIndexes();
$newIndexes = array();
foreach ($indexes as $index) {
if ($index->isPrimary()) {
// do not rename primary key
$indexName = $index->getName();
} else {
// avoid conflicts in index names
$indexName = 'oc_' . \OCP\Util::generateRandomBytes(13);
}
$newIndexes[] = new Index($indexName, $index->getColumns(), $index->isUnique(), $index->isPrimary());
}
// foreign keys are not supported so we just set it to an empty array
return new Table($newName, $table->getColumns(), $newIndexes, array(), 0, $table->getOptions());
}
protected function getDiff(Schema $targetSchema, \Doctrine\DBAL\Connection $connection) {
$sourceSchema = $connection->getSchemaManager()->createSchema();
// remove tables we don't know about
/** @var $table \Doctrine\DBAL\Schema\Table */
foreach ($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 = new Comparator();
return $comparator->compare($sourceSchema, $targetSchema);
}
/**
* @param \Doctrine\DBAL\Schema\Schema $targetSchema
* @param \Doctrine\DBAL\Connection $connection
*/
protected function applySchema(Schema $targetSchema, \Doctrine\DBAL\Connection $connection = null) {
if (is_null($connection)) {
$connection = $this->connection;
}
$schemaDiff = $this->getDiff($targetSchema, $connection);
$connection->beginTransaction();
foreach ($schemaDiff->toSql($connection->getDatabasePlatform()) as $sql) {
$connection->query($sql);
}
$connection->commit();
}
/**
* @param string $sourceName
* @param string $targetName
*/
protected function copyTable($sourceName, $targetName) {
$quotedSource = $this->connection->quoteIdentifier($sourceName);
$quotedTarget = $this->connection->quoteIdentifier($targetName);
$this->connection->exec('CREATE TABLE ' . $quotedTarget . ' (LIKE ' . $quotedSource . ')');
$this->connection->exec('INSERT INTO ' . $quotedTarget . ' SELECT * FROM ' . $quotedSource);
}
/**
* @param string $name
*/
protected function dropTable($name) {
$this->connection->exec('DROP TABLE ' . $this->connection->quoteIdentifier($name));
}
}
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