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<?php |
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/** |
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* Async sockets |
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* |
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* @copyright Copyright (c) 2015-2017, Efimov Evgenij <[email protected]> |
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* |
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* This source file is subject to the MIT license that is bundled |
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* with this source code in the file LICENSE. |
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*/ |
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namespace AsyncSockets\RequestExecutor\Pipeline; |
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use AsyncSockets\Event\DataAlertEvent; |
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use AsyncSockets\Exception\UnmanagedSocketException; |
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use AsyncSockets\Frame\EmptyFramePicker; |
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use AsyncSockets\Operation\NullOperation; |
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use AsyncSockets\Operation\ReadOperation; |
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use AsyncSockets\RequestExecutor\ExecutionContext; |
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use AsyncSockets\RequestExecutor\Metadata\RequestDescriptor; |
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use AsyncSockets\RequestExecutor\RequestExecutorInterface; |
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/** |
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* Class GuardianStage |
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*/ |
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class GuardianStage extends AbstractStage |
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{ |
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/** |
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* Maximum socket attempts to execute |
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*/ |
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const MAX_ATTEMPTS_PER_SOCKET = 25; |
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/** |
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* Indexed by RequestDescriptor object hash array of attempts, after which we should kill connection |
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* |
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* @var int[] |
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*/ |
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private $candidates = []; |
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/** |
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* Disconnect stage |
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* |
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* @var DisconnectStage |
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*/ |
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private $disconnectStage; |
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/** |
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* GuardianStage constructor. |
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* |
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* @param RequestExecutorInterface $executor Request executor |
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* @param EventCaller $eventCaller Event caller |
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* @param ExecutionContext $executionContext Execution context |
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* @param DisconnectStage $disconnectStage Disconnect stage |
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*/ |
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public function __construct( |
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RequestExecutorInterface $executor, |
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EventCaller $eventCaller, |
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ExecutionContext $executionContext, |
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DisconnectStage $disconnectStage |
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) { |
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parent::__construct($executor, $eventCaller, $executionContext); |
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$this->disconnectStage = $disconnectStage; |
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} |
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/** {@inheritdoc} */ |
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public function processStage(array $requestDescriptors) |
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{ |
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$result = []; |
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foreach ($requestDescriptors as $key => $descriptor) { |
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if (!$this->handleDeadConnection($descriptor)) { |
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$result[$key] = $descriptor; |
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} |
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} |
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return $result; |
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} |
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/** |
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* Check if this request is alive and managed by client code |
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* |
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* @param RequestDescriptor $descriptor Object to test |
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* |
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* @return bool True if connection killed, false otherwise |
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*/ |
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private function handleDeadConnection(RequestDescriptor $descriptor) |
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{ |
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$key = spl_object_hash($descriptor); |
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if (!$this->isZombieCandidate($descriptor)) { |
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unset($this->candidates[$key]); |
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return false; |
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} |
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if (!isset($this->candidates[$key])) { |
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$this->candidates[$key] = self::MAX_ATTEMPTS_PER_SOCKET; |
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} |
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$this->notifyDataAlert( |
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$descriptor, |
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self::MAX_ATTEMPTS_PER_SOCKET - $this->candidates[$key] + 1, |
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self::MAX_ATTEMPTS_PER_SOCKET |
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); |
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--$this->candidates[$key]; |
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$result = false; |
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if (!$this->candidates[$key]) { |
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$result = true; |
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$this->killZombieConnection($descriptor); |
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unset($this->candidates[$key]); |
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} |
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return $result; |
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} |
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/** |
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* Check if this socket can be a zombie |
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* |
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* @param RequestDescriptor $descriptor Descriptor object |
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* |
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* @return bool |
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*/ |
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private function isZombieCandidate(RequestDescriptor $descriptor) |
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{ |
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$metadata = $descriptor->getMetadata(); |
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if ($metadata[RequestExecutorInterface::META_REQUEST_COMPLETE]) { |
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return false; |
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} |
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$operation = $descriptor->getOperation(); |
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return ($operation instanceof NullOperation) || |
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( |
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$operation instanceof ReadOperation && |
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$operation->getFramePicker() instanceof EmptyFramePicker |
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); |
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} |
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/** |
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* Closes connection, as we suppose it is unmanaged |
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* |
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* @param RequestDescriptor $descriptor Descriptor object to kill |
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* |
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* @return void |
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*/ |
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private function killZombieConnection(RequestDescriptor $descriptor) |
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{ |
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$this->eventCaller->callExceptionSubscribers( |
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$descriptor, |
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UnmanagedSocketException::zombieSocketDetected($descriptor->getSocket()), |
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$this->executor, |
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$this->executionContext |
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); |
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$this->disconnectStage->disconnect($descriptor); |
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} |
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/** |
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* Notify client about unhandled data in socket |
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* |
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* @param RequestDescriptor $descriptor Socket operation descriptor |
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* @param int $attempt Current attempt number from 1 |
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* @param int $totalAttempts Total attempts |
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* |
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* @return void |
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*/ |
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private function notifyDataAlert( |
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RequestDescriptor $descriptor, |
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$attempt, |
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$totalAttempts |
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) { |
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$socket = $descriptor->getSocket(); |
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$meta = $this->executor->socketBag()->getSocketMetaData($socket); |
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$event = new DataAlertEvent( |
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$this->executor, |
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$socket, |
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$meta[ RequestExecutorInterface::META_USER_CONTEXT ], |
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$attempt, |
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$totalAttempts |
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); |
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$this->callSocketSubscribers($descriptor, $event); |
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$operation = $event->getNextOperation(); |
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if ($operation) { |
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$descriptor->setOperation($operation); |
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} |
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} |
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} |
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|
edefimov /
async-sockets
