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<?php |
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namespace Helix\DB; |
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use Helix\DB; |
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/** |
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* @method static static factory(DB $db, string $dir); |
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*/ |
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class Migrator { |
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use FactoryTrait; |
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/** |
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* @var DB |
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*/ |
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protected $db; |
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/** |
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* @var string |
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*/ |
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protected $dir; |
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/** |
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* @var Table |
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*/ |
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protected $table; |
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/** |
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* @param DB $db |
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* @param string $dir |
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*/ |
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public function __construct (DB $db, string $dir) { |
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$this->db = $db; |
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$this->dir = $dir; |
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$this->table ??= $db['__migrations__'] ?? $db->getSchema()->createTable('__migrations__', [ |
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'sequence' => Schema::T_STRING_STRICT | Schema::I_PRIMARY |
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])['__migrations__']; |
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} |
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/** |
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* Migrates down within a transaction. |
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* |
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* @param string $to Migration sequence identifier, or `null` to step down once. |
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* @return false|string The resulting current sequence identifier. |
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*/ |
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public function down (string $to = null) { |
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return $this->db->transact(function() use ($to) { |
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$current = $this->getCurrent(); |
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// walk newest to oldest |
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foreach (array_reverse($this->glob(), true) as $sequence => $spec) { |
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if ($current and $to === $current) { |
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break; |
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} |
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if ($current < $sequence) { |
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continue; |
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} |
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$this->db->transact(function() use ($sequence, $spec) { |
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$this->getMigration($spec)->down($this->db); |
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$this->table->delete(['sequence' => $sequence]); |
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}); |
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$current = $this->getCurrent(); |
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if ($to === null) { |
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break; |
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} |
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} |
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return $current; |
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}); |
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} |
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/** |
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* Returns the sequence identifier of the most recent upgrade. |
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* |
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* @return null|string |
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*/ |
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public function getCurrent (): ?string { |
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return $this->table->select([$this->table['sequence']->max()])->getResult(); |
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} |
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/** |
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* @param array $spec |
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* @return MigrationInterface |
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*/ |
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protected function getMigration (array $spec) { |
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include_once "{$spec['file']}"; |
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$migration = new $spec['class']; |
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assert($migration instanceof MigrationInterface); |
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return $migration; |
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} |
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/** |
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* Scans the migration directory for `<SEQUENCE>_<CLASS>.php` files. |
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* |
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* @return array[] [ file => spec array ] |
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*/ |
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protected function glob () { |
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$specs = []; |
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$files = glob("{$this->dir}/?*_?*.php"); |
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foreach ($files as $file) { |
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preg_match('/^(?<sequence>[^_]+)_(?<class>.*)\.php$/', basename($file), $spec); |
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$specs[$spec['sequence']] = [ |
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'file' => $file, |
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'class' => "\\{$spec['class']}" |
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]; |
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} |
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return $specs; |
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} |
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/** |
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* Migrates up within a transaction. |
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* |
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* @param null|string $to Migration sequence identifier, or `null` for all upgrades. |
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* @return false|string The resulting current sequence identifier. |
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*/ |
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public function up (string $to = null) { |
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return $this->db->transact(function() use ($to) { |
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$current = $this->getCurrent(); |
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// walk oldest to newest |
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foreach ($this->glob() as $sequence => $spec) { |
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if ($current and $to === $current) { |
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break; |
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} |
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if ($current >= $sequence) { |
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continue; |
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} |
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$this->db->transact(function() use ($sequence, $spec) { |
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$this->getMigration($spec)->up($this->db); |
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$this->table->insert(['sequence' => $sequence]); |
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}); |
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$current = $sequence; |
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} |
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return $current; |
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}); |
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} |
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} |
hfw /
db
