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Psr7EventStream.php
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Psr7EventStream.php
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<?php
declare(strict_types=1);
/*
* This file is part of the Composer package "eliashaeussler/sse".
*
* Copyright (C) 2023-2024 Elias Häußler <[email protected]>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
namespace EliasHaeussler\SSE\Stream;
use EliasHaeussler\SSE\Event;
use EliasHaeussler\SSE\Exception;
use Http\Discovery;
use Psr\Http\Message;
use function json_encode;
use function sprintf;
use function uniqid;
/**
* Psr7EventStream.
*
* @author Elias Häußler <[email protected]>
* @license GPL-3.0-or-later
*/
final class Psr7EventStream implements EventStream
{
private ?Message\ResponseInterface $response = null;
private bool $closed = false;
/**
* @param non-empty-string $id
*/
private function __construct(
private readonly string $id,
private readonly int $retry,
private readonly Message\ResponseFactoryInterface $responseFactory,
) {}
/**
* @param non-empty-string|null $id
*/
public static function create(?string $id = null, int $retry = 50): self
{
$id ??= uniqid();
$responseFactory = Discovery\Psr17FactoryDiscovery::findResponseFactory();
return new self($id, $retry, $responseFactory);
}
public function open(): void
{
if ($this->isActive()) {
throw new Exception\StreamIsActive();
}
$this->response = $this->responseFactory->createResponse()
->withHeader('Content-Type', self::CONTENT_TYPE)
->withHeader('Cache-Control', 'no-cache')
->withHeader('Connection', 'keep-alive')
->withHeader('X-Accel-Buffering', 'no')
;
}
public function close(string $eventName = 'done'): void
{
$this->sendMessage($eventName);
$this->closed = true;
}
public function sendEvent(Event\Event $event): void
{
$this->sendMessage($event->getName(), json_encode($event, JSON_THROW_ON_ERROR));
}
public function sendMessage(string $name = 'message', bool|float|int|string|null $data = null): void
{
if ($this->closed) {
throw new Exception\StreamIsClosed();
}
if (!$this->isActive()) {
throw new Exception\StreamIsInactive();
}
// Send event data
$this->sendStreamData('id', $this->id);
$this->sendStreamData('event', $name);
$this->sendStreamData('data', $data);
$this->sendStreamData('retry', $this->retry);
$this->sendDelimiter();
}
/**
* @phpstan-assert-if-true !null $this->response
*/
public function isActive(): bool
{
return null !== $this->response;
}
/**
* @return non-empty-string
*/
public function getId(): string
{
return $this->id;
}
/**
* @throws Exception\StreamIsInactive
*/
public function getResponse(): Message\ResponseInterface
{
if (!$this->isActive()) {
throw new Exception\StreamIsInactive();
}
return $this->response;
}
public static function canHandle(Message\ServerRequestInterface $request): bool
{
return $request->getHeader('Accept') === [self::CONTENT_TYPE];
}
private function sendStreamData(string $name, bool|float|int|string|null $value): void
{
$this->addBodyLine(
sprintf('%s: %s', $name, $value),
);
$this->sendDelimiter();
}
private function sendDelimiter(): void
{
$this->addBodyLine(PHP_EOL);
}
private function addBodyLine(string $line): void
{
$this->response?->getBody()->write($line);
}
}