Viewing file:  RoundRobinTransport.php (3.39 KB) -rw-r--r--
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<?php
/*
* This file is part of the Symfony package.
*
* (c) Fabien Potencier <fabien@symfony.com>
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
namespace Symfony\Component\Mailer\Transport;
use Symfony\Component\Mailer\Envelope;
use Symfony\Component\Mailer\Exception\TransportException;
use Symfony\Component\Mailer\Exception\TransportExceptionInterface;
use Symfony\Component\Mailer\SentMessage;
use Symfony\Component\Mime\RawMessage;
/**
* Uses several Transports using a round robin algorithm.
*
* @author Fabien Potencier <fabien@symfony.com>
*/
class RoundRobinTransport implements TransportInterface
{
/**
* @var \SplObjectStorage<TransportInterface, float>
*/
private \SplObjectStorage $deadTransports;
private array $transports = [];
private int $retryPeriod;
private int $cursor = -1;
/**
* @param TransportInterface[] $transports
*/
public function __construct(array $transports, int $retryPeriod = 60)
{
if (!$transports) {
throw new TransportException(sprintf('"%s" must have at least one transport configured.', static::class));
}
$this->transports = $transports;
$this->deadTransports = new \SplObjectStorage();
$this->retryPeriod = $retryPeriod;
}
public function send(RawMessage $message, Envelope $envelope = null): ?SentMessage
{
while ($transport = $this->getNextTransport()) {
try {
return $transport->send($message, $envelope);
} catch (TransportExceptionInterface) {
$this->deadTransports[$transport] = microtime(true);
}
}
throw new TransportException('All transports failed.');
}
public function __toString(): string
{
return $this->getNameSymbol().'('.implode(' ', array_map('strval', $this->transports)).')';
}
/**
* Rotates the transport list around and returns the first instance.
*/
protected function getNextTransport(): ?TransportInterface
{
if (-1 === $this->cursor) {
$this->cursor = $this->getInitialCursor();
}
$cursor = $this->cursor;
while (true) {
$transport = $this->transports[$cursor];
if (!$this->isTransportDead($transport)) {
break;
}
if ((microtime(true) - $this->deadTransports[$transport]) > $this->retryPeriod) {
$this->deadTransports->detach($transport);
break;
}
if ($this->cursor === $cursor = $this->moveCursor($cursor)) {
return null;
}
}
$this->cursor = $this->moveCursor($cursor);
return $transport;
}
protected function isTransportDead(TransportInterface $transport): bool
{
return $this->deadTransports->contains($transport);
}
protected function getInitialCursor(): int
{
// the cursor initial value is randomized so that
// when are not in a daemon, we are still rotating the transports
return mt_rand(0, \count($this->transports) - 1);
}
protected function getNameSymbol(): string
{
return 'roundrobin';
}
private function moveCursor(int $cursor): int
{
return ++$cursor >= \count($this->transports) ? 0 : $cursor;
}
}
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