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<?php |
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namespace Jalle19\StatusManager\Manager; |
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use Jalle19\StatusManager\Configuration\Configuration; |
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use Jalle19\StatusManager\Configuration\Instance; |
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use Jalle19\StatusManager\Event\Events; |
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use Jalle19\StatusManager\Event\InstanceStateEvent; |
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use Jalle19\StatusManager\Event\InstanceStatusCollectionRequestEvent; |
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use Jalle19\StatusManager\Instance\InstanceState; |
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use Psr\Log\LoggerInterface; |
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use Symfony\Component\EventDispatcher\EventDispatcher; |
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use Symfony\Component\EventDispatcher\EventSubscriberInterface; |
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/** |
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* Keeps track of the reachability for all configures instances. |
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* |
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* @package Jalle19\StatusManager\Manager |
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* @copyright Copyright © Sam Stenvall 2016- |
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* @license https://www.gnu.org/licenses/gpl.html The GNU General Public License v2.0 |
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*/ |
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class InstanceStateManager extends AbstractManager implements EventSubscriberInterface |
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{ |
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/** |
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* The number of cycles to wait until retrying an unreachable instance |
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*/ |
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const UNREACHABLE_CYCLES_UNTIL_RETRY = 10; |
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/** |
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* @var \SplObjectStorage the instances to connect to and their individual state |
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*/ |
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private $_instances; |
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/** |
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* InstanceStateManager constructor. |
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* |
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* @param Configuration $configuration |
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* @param LoggerInterface $logger |
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* @param EventDispatcher $eventDispatcher |
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*/ |
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public function __construct(Configuration $configuration, LoggerInterface $logger, EventDispatcher $eventDispatcher) |
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{ |
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parent::__construct($configuration, $logger, $eventDispatcher); |
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$this->_instances = new \SplObjectStorage(); |
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// Attach a state to each instance |
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foreach ($configuration->getInstances() as $instance) |
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$this->_instances->attach($instance, new InstanceState()); |
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} |
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/** |
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* @inheritdoc |
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*/ |
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public static function getSubscribedEvents() |
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{ |
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return [ |
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Events::INSTANCE_STATUS_COLLECTION_REQUEST => 'onInstanceStatusCollectionRequest', |
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Events::INSTANCE_STATE_REACHABLE => 'onInstanceReachable', |
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Events::INSTANCE_STATE_UNREACHABLE => 'onInstanceUnreachable', |
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Events::INSTANCE_STATE_MAYBE_REACHABLE => 'onInstanceMaybeReachable', |
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]; |
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} |
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/** |
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* Handler for the INSTANCE_STATUS_COLLECTION_EVENT event |
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* |
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* @param InstanceStatusCollectionRequestEvent $event |
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*/ |
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public function onInstanceStatusCollectionRequest(InstanceStatusCollectionRequestEvent $event) |
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{ |
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$event->setInstanceCollection($this->_instances); |
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} |
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/** |
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* Called when an instance was tried and reachable |
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* |
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* @param InstanceStateEvent $event |
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*/ |
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public function onInstanceReachable(InstanceStateEvent $event) |
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{ |
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$instance = $event->getInstance(); |
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$instanceState = $this->getInstanceState($instance); |
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// Update reachability state now that we know the instance is reachable |
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if ($instanceState->getReachability() === InstanceState::MAYBE_REACHABLE) |
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{ |
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$this->logger->notice('Instance {instanceName} is now reachable, will start polling for updates', [ |
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'instanceName' => $instance->getName(), |
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]); |
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$instanceState->setReachability(InstanceState::REACHABLE); |
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} |
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} |
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/** |
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* Called when an instance was tried and wasn't reachable |
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* |
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* @param InstanceStateEvent $event |
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*/ |
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public function onInstanceUnreachable(InstanceStateEvent $event) |
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{ |
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$instance = $event->getInstance(); |
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$instanceState = $this->getInstanceState($instance); |
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// Mark the instance as unreachable |
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$message = 'Instance {instanceName} not reachable, will wait for {cycles} cycles before retrying'; |
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$this->logger->warning($message, [ |
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'instanceName' => $instance->getName(), |
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'cycles' => self::UNREACHABLE_CYCLES_UNTIL_RETRY, |
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]); |
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$instanceState->setReachability(InstanceState::UNREACHABLE); |
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} |
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/** |
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* Called when a previously unreachable instance was left untried for the current tick |
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* |
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* @param InstanceStateEvent $event |
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*/ |
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public function onInstanceMaybeReachable(InstanceStateEvent $event) |
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{ |
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$instance = $event->getInstance(); |
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$instanceState = $this->getInstanceState($instance); |
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// Wait for some cycles and then mark unreachable instances as maybe reachable |
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if ($instanceState->getRetryCount() === self::UNREACHABLE_CYCLES_UNTIL_RETRY - 1) |
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{ |
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$instanceState->setReachability(InstanceState::MAYBE_REACHABLE); |
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$instanceState->resetRetryCount(); |
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$this->logger->info('Retrying instance {instanceName} during next cycle', [ |
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'instanceName' => $instance->getName(), |
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]); |
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} |
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else |
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$instanceState->incrementRetryCount(); |
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} |
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/** |
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* @param Instance $instance |
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* |
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* @return InstanceState |
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*/ |
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public function getInstanceState(Instance $instance) |
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{ |
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return $this->_instances[$instance]; |
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} |
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} |
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Jalle19 /
tvheadend-status-manager
