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<?php |
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namespace Daikon\CouchDb\Storage; |
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use Daikon\CouchDb\Connector\CouchDbConnector; |
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use Daikon\Dbal\Exception\DbalException; |
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use Daikon\Dbal\Storage\StorageAdapterInterface; |
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use Daikon\EventSourcing\EventStore\CommitSequence; |
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use GuzzleHttp\Exception\RequestException; |
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use GuzzleHttp\Psr7\Request; |
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final class CouchDbStorageAdapter implements StorageAdapterInterface |
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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 $identifier) |
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{ |
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$viewPath = sprintf( |
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'/_design/%s/_view/%s', |
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$this->settings['design_doc'], |
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$this->settings['view_name'] ?? 'commit_stream' |
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); |
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$viewParams = [ |
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'startkey' => sprintf('["%s", {}]', $identifier), |
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'endkey' => sprintf('["%s", 1]', $identifier), |
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'include_docs' => 'true', |
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'reduce' => 'false', |
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'descending' => 'true', |
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'limit' => 1000 // @todo use snapshot size config setting as soon as available |
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]; |
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try { |
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$response = $this->request($viewPath, 'GET', [], $viewParams); |
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$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 CommitSequence::makeEmpty(); |
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} else { |
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throw $error; |
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} |
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} |
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if (!isset($rawResponse['total_rows'])) { |
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throw new DbalException('Failed to read data for '.$identifier); |
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} |
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return CommitSequence::fromArray(array_map(function (array $commitData) { |
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return $commitData['doc']; |
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}, array_reverse($rawResponse['rows']))); |
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} |
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public function write(string $identifier, array $body) |
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{ |
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$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($rawResponse['rev'])) { |
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throw new DbalException('Failed to write data for '.$identifier); |
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} |
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} |
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public function delete(string $identifier) |
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{ |
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throw new DbalException('Not yet implemented'); |
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} |
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private function request(string $identifier, string $method, array $body = [], array $params = []) |
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{ |
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$requestPath = $this->buildRequestPath($identifier, $params); |
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if (empty($body)) { |
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$request = new Request($method, $requestPath, ['Accept' => 'application/json']); |
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} else { |
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$request = new Request( |
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$method, |
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$requestPath, |
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['Accept' => 'application/json', 'Content-Type' => 'application/json'], |
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json_encode($body) |
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); |
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} |
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return $this->connector->getConnection()->send($request); |
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} |
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private function buildRequestPath(string $identifier, array $params = []) |
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{ |
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$settings = $this->connector->getSettings(); |
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$requestPath = sprintf('/%s/%s', $settings['database'], $identifier); |
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if (!empty($params)) { |
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$requestPath .= '?'.http_build_query($params); |
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} |
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return str_replace('//', '/', $requestPath); |
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} |
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} |
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daikon-cqrs /
couchdb-adapter
