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<?php |
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/** |
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* ZeroMQ interface for cruftflake. |
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* |
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* @author @davegardnerisme |
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*/ |
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namespace Gendoria\CruftFlake\Zmq; |
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use Exception; |
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use Gendoria\CruftFlake\Generator\Generator; |
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use Gendoria\CruftFlake\ServerInterface; |
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use Psr\Log\LoggerAwareInterface; |
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use Psr\Log\LoggerInterface; |
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use Psr\Log\NullLogger; |
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class ZmqServer implements ServerInterface, LoggerAwareInterface |
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{ |
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/** |
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* Cruft flake generator. |
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* |
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* @var Generator |
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*/ |
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private $generator; |
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/** |
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* DSN. |
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* |
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* @var string |
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*/ |
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private $dsn; |
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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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private $debugMode = false; |
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/** |
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* Constructor. |
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* |
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* @param @inject Generator $generator |
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* @param string $dsn Where socket should be bound. Default 'tcp://*:5599' |
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* @param bool $debugMode Debug mode. If set to true, server will only listen for one command, before exiting. |
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*/ |
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public function __construct(Generator $generator, $dsn = 'tcp://*:5599', $debugMode = false) |
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{ |
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$this->generator = $generator; |
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$this->dsn = $dsn; |
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$this->logger = new NullLogger(); |
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$this->debugMode = $debugMode; |
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} |
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/** |
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* Run ZMQ interface for generator. |
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* |
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* Req-rep pattern; msgs are commands: |
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* |
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* GEN = Generate ID |
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* STATUS = Get status string |
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*/ |
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public function run() |
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{ |
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$receiver = $this->getZmqSocket($this->dsn); |
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while (true) { |
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$msg = $receiver->recv(); |
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$this->logger->debug('ZMQ server received command: ' . $msg); |
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$response = $this->runCommand($msg); |
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$receiver->send(json_encode($response)); |
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if ($this->debugMode) { |
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break; |
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} |
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} |
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} |
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private function runCommand($msg) |
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{ |
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switch ($msg) { |
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case 'GEN': |
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return $this->commandGenerate(); |
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case 'STATUS': |
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return $this->commandStatus(); |
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default: |
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$this->logger->debug('Unknown command received: ' . $msg); |
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return $this->createResponse('UNKNOWN COMMAND', 404); |
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} |
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} |
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/** |
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* Create generate command response. |
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* |
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* @return array |
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*/ |
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private function commandGenerate() |
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{ |
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try { |
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$response = $this->createResponse($this->generator->generate()); |
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} catch (Exception $e) { |
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$this->logger->error('Generator error: ' . $e->getMessage(), array($e, $this)); |
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$response = $this->createResponse('ERROR', 500); |
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} |
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return $response; |
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} |
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/** |
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* Create status command response. |
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* |
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* @return array |
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*/ |
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private function commandStatus() |
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{ |
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return $this->createResponse($this->generator->status()); |
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} |
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/** |
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* Prepare response. |
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* |
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* @param mixed $message Return message. Anything, which is JSON serializable. |
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* @param int $code Response code. |
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* |
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* @return array |
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*/ |
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private function createResponse($message, $code = 200) |
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{ |
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return array( |
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'code' => $code, |
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'message' => $message, |
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); |
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} |
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/** |
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* Get ZMQ socket. |
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* |
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* @param string $dsn DSN, on which ZMQ connection should listen. |
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* |
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* @return \ZMQSocket |
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*/ |
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protected function getZmqSocket($dsn) |
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{ |
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$context = new \ZMQContext(); |
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$receiver = new \ZMQSocket($context, \ZMQ::SOCKET_REP); |
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$this->logger->debug("Binding to {$dsn}"); |
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$receiver->bind($dsn); |
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return $receiver; |
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} |
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public function setLogger(LoggerInterface $logger) |
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{ |
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$this->logger = $logger; |
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} |
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} |
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Gendoria /
cruftflake
