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<?php |
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namespace Innmind\ProvisionerBundle\EventListener; |
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use Innmind\ProvisionerBundle\ProcessStatusHandler; |
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use Innmind\ProvisionerBundle\RabbitMQ\HistoryInterface; |
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use Innmind\ProvisionerBundle\RabbitMQ\Admin; |
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use Innmind\ProvisionerBundle\Event\ProvisionRequirementEvent; |
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use Innmind\ProvisionerBundle\Math; |
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use Psr\Log\LoggerInterface; |
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use RuntimeException; |
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class RabbitMQRequirementListener |
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{ |
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protected $processStatus; |
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protected $queueHistory; |
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protected $admin; |
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protected $logger; |
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/** |
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* Set process status handler |
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* |
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* @param ProcessStatusHandler $handler |
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*/ |
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public function setProcessStatusHandler(ProcessStatusHandler $handler) |
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{ |
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$this->processStatus = $handler; |
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} |
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/** |
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* Set the queue history object to help retrieve last |
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* queue depth number |
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* |
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* @param HistoryInterface $history |
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*/ |
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public function setQueueHistory(HistoryInterface $history) |
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{ |
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$this->queueHistory = $history; |
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} |
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/** |
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* Set the rabbitmq admin interface |
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* |
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* @param Admin $admin |
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*/ |
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public function setRabbitMQAdmin(Admin $admin) |
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{ |
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$this->admin = $admin; |
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} |
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/** |
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* Set the logger |
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* |
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* @param LoggerInterface $logger |
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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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* Compute how many consumers needs to be run |
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* |
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* @param ProvisionRequirementEvent $event |
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*/ |
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public function handle(ProvisionRequirementEvent $event) |
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{ |
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if ($event->getCommandName() !== 'rabbitmq:consumer') { |
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return; |
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} |
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$input = $event->getCommandInput(); |
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if (!$input->hasOption('messages')) { |
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throw new RuntimeException('Consumers must be run with the "messages" option'); |
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} |
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$command = sprintf( |
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'console %s', |
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(string) $input |
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); |
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$consumers = $this->processStatus->getProcessCount($command); |
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$messages = (int) $input->getOption('messages'); |
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$queue = $input->getArgument('name'); |
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$depth = $this->admin->listQueueMessages($queue); |
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$depthHistory = $this->queueHistory->get(sprintf( |
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'%s.queue_depth', |
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$queue |
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)); |
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if ($this->logger) { |
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$this->logger->info( |
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'Estimating required consumers processes', |
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[ |
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'queue_depth' => $depth, |
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'previous_depth' => end($depthHistory), |
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] |
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); |
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} |
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$depthHistory[] = $depth; |
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if (count($depthHistory) > 1) { |
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$estimated = $this->getEstimatedDepth($depthHistory); |
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$depth = $estimated['current']; |
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$previousDepth = $estimated['previous']; |
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} else { |
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$previousDepth = 0; |
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} |
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$event->setRequiredProcesses( |
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$this->computeRequirement( |
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$previousDepth, |
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$depth, |
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$messages, |
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$consumers |
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) |
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); |
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$event->stopPropagation(); |
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$this->queueHistory->put(sprintf( |
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'%s.queue_depth', |
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$queue |
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), $depthHistory); |
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if ($this->logger) { |
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$this->logger->info(sprintf( |
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'Required consumers processes estimated to %s', |
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$event->getRequiredProcesses() |
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)); |
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} |
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} |
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/** |
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* Determine how many consumers to launch based on previous |
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* messages count and the new one, and the available consumers |
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* |
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* @param float $previousDepth |
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* @param float $currentDepth |
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* @param int $messages Messages consumed by one consumer |
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* @param int $consumers Running consumers |
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* |
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* @return int |
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*/ |
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public function computeRequirement($previousDepth, $currentDepth, $messages, $consumers) |
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{ |
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if ((int) $previousDepth === 0) { |
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if ( |
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(float) $currentDepth < (int) $messages && |
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(int) $consumers >= 1 |
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) { |
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$consumersToLaunch = 0; |
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} else { |
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$consumersToLaunch = 2; |
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} |
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} else { |
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$diff = (float) $currentDepth - (float) $previousDepth; |
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if ($diff <= 0) { |
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$consumersToLaunch = 1; |
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if ( |
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(float) $currentDepth < (int) $messages && |
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(int) $consumers >= 1 |
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) { |
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$consumersToLaunch = 0; |
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} else if ( |
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(int) $diff === 0 && |
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$currentDepth > (int) $messages |
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) { |
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$consumersToLaunch = 2; |
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} |
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} else { |
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$consumersToLaunch = (int) floor($diff / $messages); |
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} |
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} |
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return $consumersToLaunch; |
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} |
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/** |
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* Return estimated previous and current depth once |
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* a linear regression is applied to the real history |
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* |
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* @param array $history |
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* |
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* @return array As ['previous' => float, 'current' => float] |
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*/ |
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public function getEstimatedDepth(array $history) |
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{ |
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$regression = Math::linearRegression($history); |
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$previous = (count($history) - 2) * $regression['slope'] + $regression['intercept']; |
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$current = (count($history) - 1) * $regression['slope'] + $regression['intercept']; |
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return [ |
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'previous' => $previous, |
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'current' => $current, |
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]; |
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} |
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} |
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Innmind /
ProvisionerBundle
