143 lines
4.0 KiB
PHP
143 lines
4.0 KiB
PHP
<?php
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/*
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* This file is part of the Symfony package.
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*
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* (c) Fabien Potencier <fabien@symfony.com>
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*
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* For the full copyright and license information, please view the LICENSE
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* file that was distributed with this source code.
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*/
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namespace Symfony\Component\Notifier\Transport;
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use Symfony\Component\Notifier\Exception\LogicException;
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use Symfony\Component\Notifier\Exception\RuntimeException;
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use Symfony\Component\Notifier\Exception\TransportExceptionInterface;
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use Symfony\Component\Notifier\Message\MessageInterface;
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use Symfony\Component\Notifier\Message\SentMessage;
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/**
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* Uses several Transports using a round robin algorithm.
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*
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* @author Fabien Potencier <fabien@symfony.com>
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*/
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class RoundRobinTransport implements TransportInterface
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{
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/**
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* @var \SplObjectStorage<TransportInterface, float>
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*/
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private \SplObjectStorage $deadTransports;
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private array $transports = [];
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private int $retryPeriod;
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private int $cursor = -1;
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/**
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* @param TransportInterface[] $transports
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*/
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public function __construct(array $transports, int $retryPeriod = 60)
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{
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if (!$transports) {
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throw new LogicException(sprintf('"%s" must have at least one transport configured.', static::class));
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}
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$this->transports = $transports;
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$this->deadTransports = new \SplObjectStorage();
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$this->retryPeriod = $retryPeriod;
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}
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public function __toString(): string
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{
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return implode(' '.$this->getNameSymbol().' ', array_map('strval', $this->transports));
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}
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public function supports(MessageInterface $message): bool
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{
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foreach ($this->transports as $transport) {
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if ($transport->supports($message)) {
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return true;
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}
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}
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return false;
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}
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public function send(MessageInterface $message): SentMessage
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{
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if (!$this->supports($message)) {
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throw new LogicException(sprintf('None of the configured Transports of "%s" supports the given message.', static::class));
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}
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while ($transport = $this->getNextTransport($message)) {
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try {
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return $transport->send($message);
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} catch (TransportExceptionInterface $e) {
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$this->deadTransports[$transport] = microtime(true);
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}
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}
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throw new RuntimeException('All transports failed.');
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}
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/**
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* Rotates the transport list around and returns the first instance.
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*/
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protected function getNextTransport(MessageInterface $message): ?TransportInterface
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{
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if (-1 === $this->cursor) {
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$this->cursor = $this->getInitialCursor();
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}
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$cursor = $this->cursor;
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while (true) {
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$transport = $this->transports[$cursor];
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if (!$transport->supports($message)) {
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$cursor = $this->moveCursor($cursor);
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continue;
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}
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if (!$this->isTransportDead($transport)) {
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break;
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}
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if ((microtime(true) - $this->deadTransports[$transport]) > $this->retryPeriod) {
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$this->deadTransports->detach($transport);
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break;
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}
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if ($this->cursor === $cursor = $this->moveCursor($cursor)) {
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return null;
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}
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}
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$this->cursor = $this->moveCursor($cursor);
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return $transport;
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}
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protected function isTransportDead(TransportInterface $transport): bool
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{
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return $this->deadTransports->contains($transport);
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}
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protected function getInitialCursor(): int
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{
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// the cursor initial value is randomized so that
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// when are not in a daemon, we are still rotating the transports
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return mt_rand(0, \count($this->transports) - 1);
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}
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protected function getNameSymbol(): string
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{
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return '&&';
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}
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private function moveCursor(int $cursor): int
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{
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return ++$cursor >= \count($this->transports) ? 0 : $cursor;
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}
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}
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