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<?php |
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namespace Tomaj\Hermes; |
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use Exception; |
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use Psr\Log\LoggerInterface; |
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use Psr\Log\LogLevel; |
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use Tomaj\Hermes\Handler\HandlerInterface; |
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use Tomaj\Hermes\Driver\DriverInterface; |
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use Tracy\Debugger; |
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class Dispatcher implements DispatcherInterface |
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{ |
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/** |
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* Dispatcher driver |
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* |
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* @var DriverInterface |
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*/ |
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private $driver; |
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/** |
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* Logger |
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* |
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* @var LoggerInterface |
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*/ |
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private $logger; |
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/** |
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* All registered handalers |
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* |
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* @var array |
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*/ |
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private $handlers = []; |
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/** |
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* Create new Dispatcher |
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* |
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* @param DriverInterface $driver |
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*/ |
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public function __construct(DriverInterface $driver, LoggerInterface $logger = null) |
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{ |
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$this->driver = $driver; |
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$this->logger = $logger; |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function emit(MessageInterface $message) |
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{ |
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$this->driver->send($message); |
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$this->log( |
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LogLevel::INFO, |
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"Dispatcher send message #{$message->getId()} to driver " . get_class($this->driver), |
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$this->messageLoggerContext($message) |
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); |
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return $this; |
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} |
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/** |
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* Basic method for background job to star listening. |
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* |
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* This method hook to driver wait() method and start listening events. |
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* Method is blockig, so when you call it all processing will stop. |
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* WARNING! Dont use it on web server calls. Run it only with cli. |
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* |
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* @return void |
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*/ |
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public function handle() |
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{ |
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$this->driver->wait(function (MessageInterface $message) { |
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$this->log( |
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LogLevel::INFO, |
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"Start handle message #{$message->getId()} ({$message->getType()})", |
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$this->messageLoggerContext($message) |
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); |
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return $this->dispatch($message); |
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}); |
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} |
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private function dispatch(MessageInterface $message) |
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{ |
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$type = $message->getType(); |
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if (!$this->hasHandlers($type)) { |
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return true; |
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} |
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$result = true; |
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foreach ($this->handlers[$type] as $handler) { |
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$handlerResult = $this->handleMessage($handler, $message); |
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if ($result && !$handlerResult) { |
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$result = false; |
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} |
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} |
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return $result; |
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} |
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private function handleMessage($handler, $message) |
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{ |
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// check if handler implements Psr\Log\LoggerAwareInterface (you can use \Psr\Log\LoggerAwareTrait) |
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if ($this->logger && method_exists($handler, 'setLogger')) { |
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$handler->setLogger($this->logger); |
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} |
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try { |
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$result = $handler->handle($message); |
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$this->log( |
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LogLevel::INFO, |
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"End handle message #{$message->getId()} ({$message->getType()})", |
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$this->messageLoggerContext($message) |
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); |
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} catch (Exception $e) { |
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$this->log( |
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LogLevel::ERROR, |
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"Handler " . get_class($handler) . " throws exception - {$e->getMessage()}", |
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['error' => $e, 'message' => $this->messageLoggerContext($message), 'exception' => $e] |
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); |
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Debugger::log($e, Debugger::EXCEPTION); |
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$result = false; |
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} |
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return $result; |
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} |
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private function hasHandlers($type) |
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{ |
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return isset($this->handlers[$type]) && count($this->handlers[$type]) > 0; |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function registerHandler($type, HandlerInterface $handler) |
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{ |
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if (!isset($this->handlers[$type])) { |
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$this->handlers[$type] = []; |
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} |
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$this->handlers[$type][] = $handler; |
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} |
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private function messageLoggerContext(MessageInterface $message) |
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{ |
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return [ |
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'id' => $message->getId(), |
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'created' => $message->getCreated(), |
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'type' => $message->getType(), |
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'payload' => $message->getPayload(), |
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]; |
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} |
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private function log($level, $message, $context) |
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{ |
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if ($this->logger) { |
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$this->logger->log($level, $message, $context); |
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} |
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} |
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} |
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tomaj /
hermes
