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<?php |
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namespace Pachico\SlimCorrelationId\Middleware; |
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use \Pachico\SlimCorrelationId\Generator; |
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use \Pachico\SlimCorrelationId\Model; |
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use \Psr\Http\Message; |
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class CorrelationId |
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{ |
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/** |
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* @var callable |
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*/ |
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private $callable; |
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/** |
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* @var array |
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*/ |
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private $settings; |
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/** |
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* @var Generator\IdInterface |
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*/ |
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private $idGenerator; |
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/** |
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* @param array $settings |
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* @param callable $callable Which will be called as soon as the correlation id is resolved |
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* @param Generator\IdInterface $idGenerator |
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*/ |
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public function __construct( |
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array $settings = [], |
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callable $callable = null, |
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Generator\IdInterface $idGenerator = null |
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) { |
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$this->settings = array_merge([ |
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'header_key' => Model\CorrelationId::DEFAULT_HEADER_KEY |
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], $settings); |
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$this->callable = $callable; |
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$this->idGenerator = $idGenerator ?: new Generator\Simple(); |
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} |
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/** |
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* @param Message\RequestInterface $request |
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* @param Message\ResponseInterface $response |
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* @param callable $next |
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* |
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* @return Message\ResponseInterface |
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*/ |
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public function __invoke(Message\RequestInterface $request, Message\ResponseInterface $response, callable $next) |
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{ |
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$correlationId = $this->resolveCorrelationId($request); |
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if ($this->callable) { |
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call_user_func_array($this->callable, [$correlationId]); |
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} |
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$requestWithHeader = $request->withHeader($this->settings['header_key'], (string) $correlationId); |
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$pipeThroughResponse = $next($requestWithHeader, $response); |
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$responseWithHeader = $pipeThroughResponse->withHeader($this->settings['header_key'], (string) $correlationId); |
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return $responseWithHeader; |
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} |
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/** |
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* @param \Psr\Http\Message\RequestInterface $request |
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* |
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* @return Model\IdInterface |
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*/ |
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private function resolveCorrelationId(Message\RequestInterface $request) |
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{ |
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$headerLine = $request->getHeaderLine($this->settings['header_key']); |
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if (!empty($headerLine)) { |
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return new Model\CorrelationId($headerLine); |
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} |
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return Model\CorrelationId::create($this->idGenerator); |
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} |
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} |
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pachico /
slim-correlationid
