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<?php |
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namespace Daikon\CouchDb\Migration; |
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use Daikon\CouchDb\Connector\CouchDbConnector; |
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use Daikon\Dbal\Connector\ConnectorInterface; |
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use Daikon\Dbal\Exception\MigrationException; |
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use Daikon\Dbal\Migration\MigrationAdapterInterface; |
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use Daikon\Dbal\Migration\MigrationList; |
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use GuzzleHttp\Exception\RequestException; |
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use GuzzleHttp\Psr7\Request; |
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final class CouchDbMigrationAdapter implements MigrationAdapterInterface |
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{ |
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private $connector; |
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private $settings; |
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public function __construct(CouchDbConnector $connector, array $settings = []) |
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{ |
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$this->connector = $connector; |
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$this->settings = $settings; |
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} |
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public function read(string $identifier): MigrationList |
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{ |
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try { |
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$response = $this->request($identifier, 'GET'); |
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$rawResponse = json_decode($response->getBody(), true); |
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} catch (RequestException $error) { |
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if ($error->hasResponse() && $error->getResponse()->getStatusCode() === 404) { |
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return new MigrationList; |
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} |
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throw $error; |
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} |
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return $this->createMigrationList($rawResponse['migrations']); |
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} |
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public function write(string $identifier, MigrationList $executedMigrations): void |
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{ |
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$body = [ |
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'target' => $identifier, |
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'migrations' => $executedMigrations->toArray() |
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]; |
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if ($revision = $this->getCurrentRevision($identifier)) { |
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$body['_rev'] = $revision; |
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} |
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$response = $this->request($identifier, 'PUT', $body); |
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$rawResponse = json_decode($response->getBody(), true); |
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if (!isset($rawResponse['ok']) || !isset($rawResponse['rev'])) { |
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throw new MigrationException('Failed to write migration data for '.$identifier); |
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} |
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} |
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public function getConnector(): ConnectorInterface |
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{ |
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return $this->connector; |
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} |
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private function createMigrationList(array $migrationData) |
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{ |
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$migrations = []; |
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foreach ($migrationData as $migration) { |
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$migrationClass = $migration['@type']; |
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/* |
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* Explicitly not using a service locator to make migration classes here because |
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* it could enable unusual behaviour. |
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*/ |
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$migrations[] = new $migrationClass(new \DateTimeImmutable($migration['executedAt'])); |
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} |
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return new MigrationList($migrations); |
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} |
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private function getCurrentRevision(string $identifier): ?string |
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{ |
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try { |
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$response = $this->request($identifier, 'HEAD'); |
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$revision = trim(current($response->getHeader('ETag')), '"'); |
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} catch (RequestException $error) { |
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if (!$error->hasResponse() || $error->getResponse()->getStatusCode() !== 404) { |
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throw $error; |
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} |
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} |
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return $revision ?? null; |
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} |
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private function request(string $identifier, string $method, array $body = [], array $params = []) |
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{ |
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$uri = $this->buildUri($identifier, $params); |
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$request = empty($body) |
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? new Request($method, $uri) |
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: new Request($method, $uri, [], json_encode($body)); |
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return $this->connector->getConnection()->send($request); |
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} |
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private function buildUri(string $identifier, array $params = []) |
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{ |
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$settings = $this->connector->getSettings(); |
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$uri = sprintf('/%s/%s', $settings['database'], $identifier); |
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if (!empty($params)) { |
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$uri .= '?'.http_build_query($params); |
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} |
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return str_replace('//', '/', $uri); |
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} |
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} |
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daikon-cqrs /
couchdb-adapter
