<?php
namespace Illuminate\Database\Migrations;
use Illuminate\Contracts\Events\Dispatcher;
use Illuminate\Database\ConnectionResolverInterface as Resolver;
use Illuminate\Database\Events\MigrationEnded;
use Illuminate\Database\Events\MigrationsEnded;
use Illuminate\Database\Events\MigrationsStarted;
use Illuminate\Database\Events\MigrationStarted;
use Illuminate\Database\Events\NoPendingMigrations;
use Illuminate\Filesystem\Filesystem;
use Illuminate\Support\Arr;
use Illuminate\Support\Collection;
use Illuminate\Support\Str;
use ReflectionClass;
use Symfony\Component\Console\Output\OutputInterface;
class Migrator
{
/**
* The event dispatcher instance.
*
* @var \Illuminate\Contracts\Events\Dispatcher
*/
protected $events;
/**
* The migration repository implementation.
*
* @var \Illuminate\Database\Migrations\MigrationRepositoryInterface
*/
protected $repository;
/**
* The filesystem instance.
*
* @var \Illuminate\Filesystem\Filesystem
*/
protected $files;
/**
* The connection resolver instance.
*
* @var \Illuminate\Database\ConnectionResolverInterface
*/
protected $resolver;
/**
* The name of the default connection.
*
* @var string
*/
protected $connection;
/**
* The paths to all of the migration files.
*
* @var array
*/
protected $paths = [];
/**
* The output interface implementation.
*
* @var \Symfony\Component\Console\Output\OutputInterface
*/
protected $output;
/**
* Create a new migrator instance.
*
* @param \Illuminate\Database\Migrations\MigrationRepositoryInterface $repository
* @param \Illuminate\Database\ConnectionResolverInterface $resolver
* @param \Illuminate\Filesystem\Filesystem $files
* @param \Illuminate\Contracts\Events\Dispatcher|null $dispatcher
* @return void
*/
public function __construct(MigrationRepositoryInterface $repository,
Resolver $resolver,
Filesystem $files,
Dispatcher $dispatcher = null)
{
$this->files = $files;
$this->events = $dispatcher;
$this->resolver = $resolver;
$this->repository = $repository;
}
/**
* Run the pending migrations at a given path.
*
* @param array|string $paths
* @param array $options
* @return array
*/
public function run($paths = [], array $options = [])
{
// Once we grab all of the migration files for the path, we will compare them
// against the migrations that have already been run for this package then
// run each of the outstanding migrations against a database connection.
$files = $this->getMigrationFiles($paths);
$this->requireFiles($migrations = $this->pendingMigrations(
$files, $this->repository->getRan()
));
// Once we have all these migrations that are outstanding we are ready to run
// we will go ahead and run them "up". This will execute each migration as
// an operation against a database. Then we'll return this list of them.
$this->runPending($migrations, $options);
return $migrations;
}
/**
* Get the migration files that have not yet run.
*
* @param array $files
* @param array $ran
* @return array
*/
protected function pendingMigrations($files, $ran)
{
return Collection::make($files)
->reject(function ($file) use ($ran) {
return in_array($this->getMigrationName($file), $ran);
})->values()->all();
}
/**
* Run an array of migrations.
*
* @param array $migrations
* @param array $options
* @return void
*/
public function runPending(array $migrations, array $options = [])
{
// First we will just make sure that there are any migrations to run. If there
// aren't, we will just make a note of it to the developer so they're aware
// that all of the migrations have been run against this database system.
if (count($migrations) === 0) {
$this->fireMigrationEvent(new NoPendingMigrations('up'));
$this->note('<info>Nothing to migrate.</info>');
return;
}
// Next, we will get the next batch number for the migrations so we can insert
// correct batch number in the database migrations repository when we store
// each migration's execution. We will also extract a few of the options.
$batch = $this->repository->getNextBatchNumber();
$pretend = $options['pretend'] ?? false;
$step = $options['step'] ?? false;
$this->fireMigrationEvent(new MigrationsStarted);
// Once we have the array of migrations, we will spin through them and run the
// migrations "up" so the changes are made to the databases. We'll then log
// that the migration was run so we don't repeat it next time we execute.
foreach ($migrations as $file) {
$this->runUp($file, $batch, $pretend);
if ($step) {
$batch++;
}
}
$this->fireMigrationEvent(new MigrationsEnded);
}
/**
* Run "up" a migration instance.
*
* @param string $file
* @param int $batch
* @param bool $pretend
* @return void
*/
protected function runUp($file, $batch, $pretend)
{
// First we will resolve a "real" instance of the migration class from this
// migration file name. Once we have the instances we can run the actual
// command such as "up" or "down", or we can just simulate the action.
$migration = $this->resolvePath($file);
$name = $this->getMigrationName($file);
if ($pretend) {
return $this->pretendToRun($migration, 'up');
}
$this->note("<comment>Migrating:</comment> {$name}");
$startTime = microtime(true);
$this->runMigration($migration, 'up');
$runTime = number_format((microtime(true) - $startTime) * 1000, 2);
// Once we have run a migrations class, we will log that it was run in this
// repository so that we don't try to run it next time we do a migration
// in the application. A migration repository keeps the migrate order.
$this->repository->log($name, $batch);
$this->note("<info>Migrated:</info> {$name} ({$runTime}ms)");
}
/**
* Rollback the last migration operation.
*
* @param array|string $paths
* @param array $options
* @return array
*/
public function rollback($paths = [], array $options = [])
{
// We want to pull in the last batch of migrations that ran on the previous
// migration operation. We'll then reverse those migrations and run each
// of them "down" to reverse the last migration "operation" which ran.
$migrations = $this->getMigrationsForRollback($options);
if (count($migrations) === 0) {
$this->fireMigrationEvent(new NoPendingMigrations('down'));
$this->note('<info>Nothing to rollback.</info>');
return [];
}
return $this->rollbackMigrations($migrations, $paths, $options);
}
/**
* Get the migrations for a rollback operation.
*
* @param array $options
* @return array
*/
protected function getMigrationsForRollback(array $options)
{
if (($steps = $options['step'] ?? 0) > 0) {
return $this->repository->getMigrations($steps);
}
return $this->repository->getLast();
}
/**
* Rollback the given migrations.
*
* @param array $migrations
* @param array|string $paths
* @param array $options
* @return array
*/
protected function rollbackMigrations(array $migrations, $paths, array $options)
{
$rolledBack = [];
$this->requireFiles($files = $this->getMigrationFiles($paths));
$this->fireMigrationEvent(new MigrationsStarted);
// Next we will run through all of the migrations and call the "down" method
// which will reverse each migration in order. This getLast method on the
// repository already returns these migration's names in reverse order.
foreach ($migrations as $migration) {
$migration = (object) $migration;
if (! $file = Arr::get($files, $migration->migration)) {
$this->note("<fg=red>Migration not found:</> {$migration->migration}");
continue;
}
$rolledBack[] = $file;
$this->runDown(
$file, $migration,
$options['pretend'] ?? false
);
}
$this->fireMigrationEvent(new MigrationsEnded);
return $rolledBack;
}
/**
* Rolls all of the currently applied migrations back.
*
* @param array|string $paths
* @param bool $pretend
* @return array
*/
public function reset($paths = [], $pretend = false)
{
// Next, we will reverse the migration list so we can run them back in the
// correct order for resetting this database. This will allow us to get
// the database back into its "empty" state ready for the migrations.
$migrations = array_reverse($this->repository->getRan());
if (count($migrations) === 0) {
$this->note('<info>Nothing to rollback.</info>');
return [];
}
return $this->resetMigrations($migrations, $paths, $pretend);
}
/**
* Reset the given migrations.
*
* @param array $migrations
* @param array $paths
* @param bool $pretend
* @return array
*/
protected function resetMigrations(array $migrations, array $paths, $pretend = false)
{
// Since the getRan method that retrieves the migration name just gives us the
// migration name, we will format the names into objects with the name as a
// property on the objects so that we can pass it to the rollback method.
$migrations = collect($migrations)->map(function ($m) {
return (object) ['migration' => $m];
})->all();
return $this->rollbackMigrations(
$migrations, $paths, compact('pretend')
);
}
/**
* Run "down" a migration instance.
*
* @param string $file
* @param object $migration
* @param bool $pretend
* @return void
*/
protected function runDown($file, $migration, $pretend)
{
// First we will get the file name of the migration so we can resolve out an
// instance of the migration. Once we get an instance we can either run a
// pretend execution of the migration or we can run the real migration.
$instance = $this->resolvePath($file);
$name = $this->getMigrationName($file);
$this->note("<comment>Rolling back:</comment> {$name}");
if ($pretend) {
return $this->pretendToRun($instance, 'down');
}
$startTime = microtime(true);
$this->runMigration($instance, 'down');
$runTime = number_format((microtime(true) - $startTime) * 1000, 2);
// Once we have successfully run the migration "down" we will remove it from
// the migration repository so it will be considered to have not been run
// by the application then will be able to fire by any later operation.
$this->repository->delete($migration);
$this->note("<info>Rolled back:</info> {$name} ({$runTime}ms)");
}
/**
* Run a migration inside a transaction if the database supports it.
*
* @param object $migration
* @param string $method
* @return void
*/
protected function runMigration($migration, $method)
{
$connection = $this->resolveConnection(
$migration->getConnection()
);
$callback = function () use ($migration, $method) {
if (method_exists($migration, $method)) {
$this->fireMigrationEvent(new MigrationStarted($migration, $method));
$migration->{$method}();
$this->fireMigrationEvent(new MigrationEnded($migration, $method));
}
};
$this->getSchemaGrammar($connection)->supportsSchemaTransactions()
&& $migration->withinTransaction
? $connection->transaction($callback)
: $callback();
}
/**
* Pretend to run the migrations.
*
* @param object $migration
* @param string $method
* @return void
*/
protected function pretendToRun($migration, $method)
{
foreach ($this->getQueries($migration, $method) as $query) {
$name = get_class($migration);
$reflectionClass = new ReflectionClass($migration);
if ($reflectionClass->isAnonymous()) {
$name = $this->getMigrationName($reflectionClass->getFileName());
}
$this->note("<info>{$name}:</info> {$query['query']}");
}
}
/**
* Get all of the queries that would be run for a migration.
*
* @param object $migration
* @param string $method
* @return array
*/
protected function getQueries($migration, $method)
{
// Now that we have the connections we can resolve it and pretend to run the
// queries against the database returning the array of raw SQL statements
// that would get fired against the database system for this migration.
$db = $this->resolveConnection(
$migration->getConnection()
);
return $db->pretend(function () use ($migration, $method) {
if (method_exists($migration, $method)) {
$migration->{$method}();
}
});
}
/**
* Resolve a migration instance from a file.
*
* @param string $file
* @return object
*/
public function resolve($file)
{
$class = $this->getMigrationClass($file);
return new $class;
}
/**
* Resolve a migration instance from a migration path.
*
* @param string $path
* @return object
*/
protected function resolvePath(string $path)
{
$class = $this->getMigrationClass($this->getMigrationName($path));
if (class_exists($class) && realpath($path) == (new ReflectionClass($class))->getFileName()) {
return new $class;
}
$migration = $this->files->getRequire($path);
return is_object($migration) ? $migration : new $class;
}
/**
* Generate a migration class name based on the migration file name.
*
* @param string $migrationName
* @return string
*/
protected function getMigrationClass(string $migrationName): string
{
return Str::studly(implode('_', array_slice(explode('_', $migrationName), 4)));
}
/**
* Get all of the migration files in a given path.
*
* @param string|array $paths
* @return array
*/
public function getMigrationFiles($paths)
{
return Collection::make($paths)->flatMap(function ($path) {
return Str::endsWith($path, '.php') ? [$path] : $this->files->glob($path.'/*_*.php');
})->filter()->values()->keyBy(function ($file) {
return $this->getMigrationName($file);
})->sortBy(function ($file, $key) {
return $key;
})->all();
}
/**
* Require in all the migration files in a given path.
*
* @param array $files
* @return void
*/
public function requireFiles(array $files)
{
foreach ($files as $file) {
$this->files->requireOnce($file);
}
}
/**
* Get the name of the migration.
*
* @param string $path
* @return string
*/
public function getMigrationName($path)
{
return str_replace('.php', '', basename($path));
}
/**
* Register a custom migration path.
*
* @param string $path
* @return void
*/
public function path($path)
{
$this->paths = array_unique(array_merge($this->paths, [$path]));
}
/**
* Get all of the custom migration paths.
*
* @return array
*/
public function paths()
{
return $this->paths;
}
/**
* Get the default connection name.
*
* @return string
*/
public function getConnection()
{
return $this->connection;
}
/**
* Execute the given callback using the given connection as the default connection.
*
* @param string $name
* @param callable $callback
* @return mixed
*/
public function usingConnection($name, callable $callback)
{
$previousConnection = $this->resolver->getDefaultConnection();
$this->setConnection($name);
return tap($callback(), function () use ($previousConnection) {
$this->setConnection($previousConnection);
});
}
/**
* Set the default connection name.
*
* @param string $name
* @return void
*/
public function setConnection($name)
{
if (! is_null($name)) {
$this->resolver->setDefaultConnection($name);
}
$this->repository->setSource($name);
$this->connection = $name;
}
/**
* Resolve the database connection instance.
*
* @param string $connection
* @return \Illuminate\Database\Connection
*/
public function resolveConnection($connection)
{
return $this->resolver->connection($connection ?: $this->connection);
}
/**
* Get the schema grammar out of a migration connection.
*
* @param \Illuminate\Database\Connection $connection
* @return \Illuminate\Database\Schema\Grammars\Grammar
*/
protected function getSchemaGrammar($connection)
{
if (is_null($grammar = $connection->getSchemaGrammar())) {
$connection->useDefaultSchemaGrammar();
$grammar = $connection->getSchemaGrammar();
}
return $grammar;
}
/**
* Get the migration repository instance.
*
* @return \Illuminate\Database\Migrations\MigrationRepositoryInterface
*/
public function getRepository()
{
return $this->repository;
}
/**
* Determine if the migration repository exists.
*
* @return bool
*/
public function repositoryExists()
{
return $this->repository->repositoryExists();
}
/**
* Determine if any migrations have been run.
*
* @return bool
*/
public function hasRunAnyMigrations()
{
return $this->repositoryExists() && count($this->repository->getRan()) > 0;
}
/**
* Delete the migration repository data store.
*
* @return void
*/
public function deleteRepository()
{
return $this->repository->deleteRepository();
}
/**
* Get the file system instance.
*
* @return \Illuminate\Filesystem\Filesystem
*/
public function getFilesystem()
{
return $this->files;
}
/**
* Set the output implementation that should be used by the console.
*
* @param \Symfony\Component\Console\Output\OutputInterface $output
* @return $this
*/
public function setOutput(OutputInterface $output)
{
$this->output = $output;
return $this;
}
/**
* Write a note to the console's output.
*
* @param string $message
* @return void
*/
protected function note($message)
{
if ($this->output) {
$this->output->writeln($message);
}
}
/**
* Fire the given event for the migration.
*
* @param \Illuminate\Contracts\Database\Events\MigrationEvent $event
* @return void
*/
public function fireMigrationEvent($event)
{
if ($this->events) {
$this->events->dispatch($event);
}
}
}