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<?php
/**
* @copyright Copyright (c) 2017 Joas Schilling <coding@schilljs.com>
* @copyright Copyright (c) 2017, ownCloud GmbH
*
* @author Joas Schilling <coding@schilljs.com>
*
* @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\Schema\SchemaException;
use OC\IntegrityCheck\Helpers\AppLocator;
use OC\Migration\SimpleOutput;
use OCP\AppFramework\App;
use OCP\AppFramework\QueryException;
use OCP\IDBConnection;
use OCP\Migration\IMigrationStep;
use OCP\Migration\IOutput;
use Doctrine\DBAL\Schema\Column;
use Doctrine\DBAL\Schema\Table;
use Doctrine\DBAL\Types\Type;
class MigrationService {
/** @var boolean */
private $migrationTableCreated;
/** @var array */
private $migrations;
/** @var IOutput */
private $output;
/** @var Connection */
private $connection;
/** @var string */
private $appName;
/**
* MigrationService constructor.
*
* @param $appName
* @param IDBConnection $connection
* @param AppLocator $appLocator
* @param IOutput|null $output
* @throws \Exception
*/
public function __construct($appName, IDBConnection $connection, IOutput $output = null, AppLocator $appLocator = null) {
$this->appName = $appName;
$this->connection = $connection;
$this->output = $output;
if (null === $this->output) {
$this->output = new SimpleOutput(\OC::$server->getLogger(), $appName);
}
if ($appName === 'core') {
$this->migrationsPath = \OC::$SERVERROOT . '/core/Migrations';
$this->migrationsNamespace = 'OC\\Core\\Migrations';
} else {
if (null === $appLocator) {
$appLocator = new AppLocator();
}
$appPath = $appLocator->getAppPath($appName);
$namespace = App::buildAppNamespace($appName);
$this->migrationsPath = "$appPath/lib/Migration";
$this->migrationsNamespace = $namespace . '\\Migration';
}
}
/**
* Returns the name of the app for which this migration is executed
*
* @return string
*/
public function getApp() {
return $this->appName;
}
/**
* @return bool
* @codeCoverageIgnore - this will implicitly tested on installation
*/
private function createMigrationTable() {
if ($this->migrationTableCreated) {
return false;
}
$schema = new SchemaWrapper($this->connection);
/**
* We drop the table when it has different columns or the definition does not
* match. E.g. ownCloud uses a length of 177 for app and 14 for version.
*/
try {
$table = $schema->getTable('migrations');
$columns = $table->getColumns();
if (count($columns) === 2) {
try {
$column = $table->getColumn('app');
$schemaMismatch = $column->getLength() !== 255;
if (!$schemaMismatch) {
$column = $table->getColumn('version');
$schemaMismatch = $column->getLength() !== 255;
}
} catch (SchemaException $e) {
// One of the columns is missing
$schemaMismatch = true;
}
if (!$schemaMismatch) {
// Table exists and schema matches: return back!
$this->migrationTableCreated = true;
return false;
}
}
// Drop the table, when it didn't match our expectations.
$this->connection->dropTable('migrations');
// Recreate the schema after the table was dropped.
$schema = new SchemaWrapper($this->connection);
} catch (SchemaException $e) {
// Table not found, no need to panic, we will create it.
}
$table = $schema->createTable('migrations');
$table->addColumn('app', Type::STRING, ['length' => 255]);
$table->addColumn('version', Type::STRING, ['length' => 255]);
$table->setPrimaryKey(['app', 'version']);
$this->connection->migrateToSchema($schema->getWrappedSchema());
$this->migrationTableCreated = true;
return true;
}
/**
* Returns all versions which have already been applied
*
* @return string[]
* @codeCoverageIgnore - no need to test this
*/
public function getMigratedVersions() {
$this->createMigrationTable();
$qb = $this->connection->getQueryBuilder();
$qb->select('version')
->from('migrations')
->where($qb->expr()->eq('app', $qb->createNamedParameter($this->getApp())))
->orderBy('version');
$result = $qb->execute();
$rows = $result->fetchAll(\PDO::FETCH_COLUMN);
$result->closeCursor();
return $rows;
}
/**
* Returns all versions which are available in the migration folder
*
* @return array
*/
public function getAvailableVersions() {
$this->ensureMigrationsAreLoaded();
return array_map('strval', array_keys($this->migrations));
}
protected function findMigrations() {
$directory = realpath($this->migrationsPath);
if (!file_exists($directory) || !is_dir($directory)) {
return [];
}
$iterator = new \RegexIterator(
new \RecursiveIteratorIterator(
new \RecursiveDirectoryIterator($directory, \FilesystemIterator::SKIP_DOTS),
\RecursiveIteratorIterator::LEAVES_ONLY
),
'#^.+\\/Version[^\\/]{1,255}\\.php$#i',
\RegexIterator::GET_MATCH);
$files = array_keys(iterator_to_array($iterator));
uasort($files, function ($a, $b) {
preg_match('/^Version(\d+)Date(\d+)\\.php$/', basename($a), $matchA);
preg_match('/^Version(\d+)Date(\d+)\\.php$/', basename($b), $matchB);
if (!empty($matchA) && !empty($matchB)) {
if ($matchA[1] !== $matchB[1]) {
return ($matchA[1] < $matchB[1]) ? -1 : 1;
}
return ($matchA[2] < $matchB[2]) ? -1 : 1;
}
return (basename($a) < basename($b)) ? -1 : 1;
});
$migrations = [];
foreach ($files as $file) {
$className = basename($file, '.php');
$version = (string) substr($className, 7);
if ($version === '0') {
throw new \InvalidArgumentException(
"Cannot load a migrations with the name '$version' because it is a reserved number"
);
}
$migrations[$version] = sprintf('%s\\%s', $this->migrationsNamespace, $className);
}
return $migrations;
}
/**
* @param string $to
* @return string[]
*/
private function getMigrationsToExecute($to) {
$knownMigrations = $this->getMigratedVersions();
$availableMigrations = $this->getAvailableVersions();
$toBeExecuted = [];
foreach ($availableMigrations as $v) {
if ($to !== 'latest' && $v > $to) {
continue;
}
if ($this->shallBeExecuted($v, $knownMigrations)) {
$toBeExecuted[] = $v;
}
}
return $toBeExecuted;
}
/**
* @param string $m
* @param string[] $knownMigrations
* @return bool
*/
private function shallBeExecuted($m, $knownMigrations) {
if (in_array($m, $knownMigrations)) {
return false;
}
return true;
}
/**
* @param string $version
*/
private function markAsExecuted($version) {
$this->connection->insertIfNotExist('*PREFIX*migrations', [
'app' => $this->appName,
'version' => $version
]);
}
/**
* Returns the name of the table which holds the already applied versions
*
* @return string
*/
public function getMigrationsTableName() {
return $this->connection->getPrefix() . 'migrations';
}
/**
* Returns the namespace of the version classes
*
* @return string
*/
public function getMigrationsNamespace() {
return $this->migrationsNamespace;
}
/**
* Returns the directory which holds the versions
*
* @return string
*/
public function getMigrationsDirectory() {
return $this->migrationsPath;
}
/**
* Return the explicit version for the aliases; current, next, prev, latest
*
* @param string $alias
* @return mixed|null|string
*/
public function getMigration($alias) {
switch($alias) {
case 'current':
return $this->getCurrentVersion();
case 'next':
return $this->getRelativeVersion($this->getCurrentVersion(), 1);
case 'prev':
return $this->getRelativeVersion($this->getCurrentVersion(), -1);
case 'latest':
$this->ensureMigrationsAreLoaded();
$migrations = $this->getAvailableVersions();
return @end($migrations);
}
return '0';
}
/**
* @param string $version
* @param int $delta
* @return null|string
*/
private function getRelativeVersion($version, $delta) {
$this->ensureMigrationsAreLoaded();
$versions = $this->getAvailableVersions();
array_unshift($versions, 0);
$offset = array_search($version, $versions, true);
if ($offset === false || !isset($versions[$offset + $delta])) {
// Unknown version or delta out of bounds.
return null;
}
return (string) $versions[$offset + $delta];
}
/**
* @return string
*/
private function getCurrentVersion() {
$m = $this->getMigratedVersions();
if (count($m) === 0) {
return '0';
}
$migrations = array_values($m);
return @end($migrations);
}
/**
* @param string $version
* @return string
* @throws \InvalidArgumentException
*/
private function getClass($version) {
$this->ensureMigrationsAreLoaded();
if (isset($this->migrations[$version])) {
return $this->migrations[$version];
}
throw new \InvalidArgumentException("Version $version is unknown.");
}
/**
* Allows to set an IOutput implementation which is used for logging progress and messages
*
* @param IOutput $output
*/
public function setOutput(IOutput $output) {
$this->output = $output;
}
/**
* Applies all not yet applied versions up to $to
*
* @param string $to
* @throws \InvalidArgumentException
*/
public function migrate($to = 'latest') {
// read known migrations
$toBeExecuted = $this->getMigrationsToExecute($to);
foreach ($toBeExecuted as $version) {
$this->executeStep($version);
}
}
/**
* @param string $version
* @return mixed
* @throws \InvalidArgumentException
*/
protected function createInstance($version) {
$class = $this->getClass($version);
try {
$s = \OC::$server->query($class);
} catch (QueryException $e) {
if (class_exists($class)) {
$s = new $class();
} else {
throw new \InvalidArgumentException("Migration step '$class' is unknown");
}
}
return $s;
}
/**
* Executes one explicit version
*
* @param string $version
* @throws \InvalidArgumentException
*/
public function executeStep($version) {
$instance = $this->createInstance($version);
if (!$instance instanceof IMigrationStep) {
throw new \InvalidArgumentException('Not a valid migration');
}
$instance->preSchemaChange($this->output, function() {
return new SchemaWrapper($this->connection);
}, ['tablePrefix' => $this->connection->getPrefix()]);
$toSchema = $instance->changeSchema($this->output, function() {
return new SchemaWrapper($this->connection);
}, ['tablePrefix' => $this->connection->getPrefix()]);
if ($toSchema instanceof SchemaWrapper) {
$this->connection->migrateToSchema($toSchema->getWrappedSchema());
$toSchema->performDropTableCalls();
}
$instance->postSchemaChange($this->output, function() {
return new SchemaWrapper($this->connection);
}, ['tablePrefix' => $this->connection->getPrefix()]);
$this->markAsExecuted($version);
}
private function ensureMigrationsAreLoaded() {
if (empty($this->migrations)) {
$this->migrations = $this->findMigrations();
}
}
}