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<?php declare(strict_types=1); |
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namespace LeoCarmo\CircuitBreaker\Adapters; |
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use Swoole\Table; |
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class SwooleTableAdapter implements AdapterInterface |
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{ |
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protected Table $table; |
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public function __construct() |
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{ |
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$this->checkExtensionLoaded(); |
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$this->table = $this->createTable(); |
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} |
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protected function createTable() |
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{ |
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$table = new Table(12); |
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$table->column('count', Table::TYPE_INT, 4); |
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$table->column('until_date', Table::TYPE_INT, 4); |
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$table->create(); |
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return $table; |
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} |
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protected function checkExtensionLoaded() |
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{ |
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if (! extension_loaded('swoole')) { |
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throw new \RuntimeException('Extension swoole is required to use SwooleTableAdapter.'); |
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} |
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} |
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/** |
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* @param string $service |
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* @param int $timeWindow |
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* @return bool |
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*/ |
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public function incrementFailure(string $service, int $timeWindow): bool |
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{ |
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$key = "{$service}-failures"; |
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if ($this->table->exist($key)) { |
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return is_integer($this->table->incr($key, 'count')); |
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} |
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$date = (new \DateTime("+{$timeWindow} seconds")); |
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return $this->table->set($key, [ |
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'count' => 1, |
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'until_date' => $date->getTimestamp(), |
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]); |
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} |
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public function reachRateLimit(string $service, int $failureRateThreshold): bool |
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{ |
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$key = "{$service}-failures"; |
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if (! $this->table->exist($key)) { |
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return false; |
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} |
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$failures = $this->table->get($key); |
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if ((new \DateTime('now'))->getTimestamp() > $failures['until_date']) { |
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$this->table->delete("{$service}-failures"); |
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return false; |
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} |
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return ($failures['count'] >= $failureRateThreshold); |
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} |
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/** |
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* @param string $service |
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*/ |
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public function setSuccess(string $service): void |
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{ |
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$this->table->delete("{$service}-failures"); |
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$this->table->delete("{$service}-open"); |
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$this->table->delete("{$service}-half_open"); |
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} |
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/** |
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* @param string $service |
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* @return bool |
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*/ |
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public function isOpen(string $service): bool |
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{ |
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$key = "{$service}-open"; |
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if (! $this->table->exists($key)) { |
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return false; |
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} |
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$open = $this->table->get($key, 'until_date'); |
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return ( |
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(new \DateTime('now'))->getTimestamp() < $open |
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); |
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} |
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/** |
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* @param string $service |
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* @return bool|string |
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*/ |
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public function isHalfOpen(string $service): bool |
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{ |
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$key = "{$service}-half_open"; |
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if (! $this->table->exists($key)) { |
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return false; |
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} |
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$halfOpen = $this->table->get($key, 'until_date'); |
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return ( |
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(new \DateTime('now'))->getTimestamp() < $halfOpen |
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); |
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} |
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/** |
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* @param string $service |
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* @param int $timeWindow |
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*/ |
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public function setOpenCircuit(string $service, int $timeWindow): void |
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{ |
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$date = (new \DateTime("+{$timeWindow} seconds")); |
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$this->table->set( |
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"{$service}-open", |
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[ |
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'until_date' => $date->getTimestamp(), |
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] |
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); |
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$this->table->delete("{$service}-failures"); |
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} |
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/** |
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* @param string $service |
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* @param int $timeWindow |
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* @param int $intervalToHalfOpen |
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*/ |
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public function setHalfOpenCircuit(string $service, int $timeWindow, int $intervalToHalfOpen): void |
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{ |
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$seconds = ($timeWindow + $intervalToHalfOpen); |
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$date = (new \DateTime("+{$seconds} seconds")); |
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$this->table->set( |
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"{$service}-half_open", |
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[ |
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'until_date' => $date->getTimestamp(), |
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] |
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); |
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$this->table->delete("{$service}-failures"); |
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} |
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public function getFailuresCounter(string $service): int |
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{ |
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$failures = $this->table->get("{$service}-failures"); |
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return (int) ($failures['count'] ?? 0); |
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} |
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} |
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leocarmo /
circuit-breaker-php
