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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\HttpClient;
use Symfony\Component\HttpClient\Chunk\ServerSentEvent;
use Symfony\Component\HttpClient\Exception\EventSourceException;
use Symfony\Component\HttpClient\Response\AsyncContext;
use Symfony\Component\HttpClient\Response\AsyncResponse;
use Symfony\Contracts\HttpClient\ChunkInterface;
use Symfony\Contracts\HttpClient\Exception\TransportExceptionInterface;
use Symfony\Contracts\HttpClient\HttpClientInterface;
use Symfony\Contracts\HttpClient\ResponseInterface;
/**
* @author Antoine Bluchet <soyuka@gmail.com>
* @author Nicolas Grekas <p@tchwork.com>
*/
final class EventSourceHttpClient implements HttpClientInterface
{
use AsyncDecoratorTrait, HttpClientTrait {
AsyncDecoratorTrait::withOptions insteadof HttpClientTrait;
}
private $reconnectionTime;
public function __construct(HttpClientInterface $client = null, float $reconnectionTime = 10.0)
{
$this->client = $client ?? HttpClient::create();
$this->reconnectionTime = $reconnectionTime;
}
public function connect(string $url, array $options = []): ResponseInterface
{
return $this->request('GET', $url, self::mergeDefaultOptions($options, [
'buffer' => false,
'headers' => [
'Accept' => 'text/event-stream',
'Cache-Control' => 'no-cache',
],
], true));
}
public function request(string $method, string $url, array $options = []): ResponseInterface
{
$state = new class() {
public $buffer = null;
public $lastEventId = null;
public $reconnectionTime;
public $lastError = null;
};
$state->reconnectionTime = $this->reconnectionTime;
if ($accept = self::normalizeHeaders($options['headers'] ?? [])['accept'] ?? []) {
$state->buffer = \in_array($accept, [['Accept: text/event-stream'], ['accept: text/event-stream']], true) ? '' : null;
if (null !== $state->buffer) {
$options['extra']['trace_content'] = false;
}
}
return new AsyncResponse($this->client, $method, $url, $options, static function (ChunkInterface $chunk, AsyncContext $context) use ($state, $method, $url, $options) {
if (null !== $state->buffer) {
$context->setInfo('reconnection_time', $state->reconnectionTime);
$isTimeout = false;
}
$lastError = $state->lastError;
$state->lastError = null;
try {
$isTimeout = $chunk->isTimeout();
if (null !== $chunk->getInformationalStatus()) {
yield $chunk;
return;
}
} catch (TransportExceptionInterface $e) {
$state->lastError = $lastError ?? microtime(true);
if (null === $state->buffer || ($isTimeout && microtime(true) - $state->lastError < $state->reconnectionTime)) {
yield $chunk;
} else {
$options['headers']['Last-Event-ID'] = $state->lastEventId;
$state->buffer = '';
$state->lastError = microtime(true);
$context->getResponse()->cancel();
$context->replaceRequest($method, $url, $options);
if ($isTimeout) {
yield $chunk;
} else {
$context->pause($state->reconnectionTime);
}
}
return;
}
if ($chunk->isFirst()) {
if (preg_match('/^text\/event-stream(;|$)/i', $context->getHeaders()['content-type'][0] ?? '')) {
$state->buffer = '';
} elseif (null !== $lastError || (null !== $state->buffer && 200 === $context->getStatusCode())) {
throw new EventSourceException(sprintf('Response content-type is "%s" while "text/event-stream" was expected for "%s".', $context->getHeaders()['content-type'][0] ?? '', $context->getInfo('url')));
} else {
$context->passthru();
}
if (null === $lastError) {
yield $chunk;
}
return;
}
$rx = '/((?:\r\n|[\r\n]){2,})/';
$content = $state->buffer.$chunk->getContent();
if ($chunk->isLast()) {
$rx = substr_replace($rx, '|$', -2, 0);
}
$events = preg_split($rx, $content, -1, \PREG_SPLIT_DELIM_CAPTURE);
$state->buffer = array_pop($events);
for ($i = 0; isset($events[$i]); $i += 2) {
$event = new ServerSentEvent($events[$i].$events[1 + $i]);
if ('' !== $event->getId()) {
$context->setInfo('last_event_id', $state->lastEventId = $event->getId());
}
if ($event->getRetry()) {
$context->setInfo('reconnection_time', $state->reconnectionTime = $event->getRetry());
}
yield $event;
}
if (preg_match('/^(?::[^\r\n]*+(?:\r\n|[\r\n]))+$/m', $state->buffer)) {
$content = $state->buffer;
$state->buffer = '';
yield $context->createChunk($content);
}
if ($chunk->isLast()) {
yield $chunk;
}
});
}
}