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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\HttpFoundation;
/**
* StreamedResponse represents a streamed HTTP response.
*
* A StreamedResponse uses a callback or an iterable of strings for its content.
*
* The callback should use the standard PHP functions like echo
* to stream the response back to the client. The flush() function
* can also be used if needed.
*
* @see flush()
*
* @author Fabien Potencier <fabien@symfony.com>
*/
class StreamedResponse extends Response
{
protected ?\Closure $callback = null;
protected bool $streamed = false;
private bool $headersSent = false;
/**
* @param callable|iterable<string>|null $callbackOrChunks
* @param int $status The HTTP status code (200 "OK" by default)
*/
public function __construct(callable|iterable|null $callbackOrChunks = null, int $status = 200, array $headers = [])
{
parent::__construct(null, $status, $headers);
if (\is_callable($callbackOrChunks)) {
$this->setCallback($callbackOrChunks);
} elseif ($callbackOrChunks) {
$this->setChunks($callbackOrChunks);
}
$this->streamed = false;
$this->headersSent = false;
}
/**
* @param iterable<string> $chunks
*/
public function setChunks(iterable $chunks): static
{
$this->callback = static function () use ($chunks): void {
foreach ($chunks as $chunk) {
echo $chunk;
@ob_flush();
flush();
}
};
return $this;
}
/**
* Sets the PHP callback associated with this Response.
*
* @return $this
*/
public function setCallback(callable $callback): static
{
$this->callback = $callback(...);
return $this;
}
public function getCallback(): ?\Closure
{
if (!isset($this->callback)) {
return null;
}
return ($this->callback)(...);
}
/**
* This method only sends the headers once.
*
* @param positive-int|null $statusCode The status code to use, override the statusCode property if set and not null
*
* @return $this
*/
public function sendHeaders(?int $statusCode = null): static
{
if ($this->headersSent) {
return $this;
}
if ($statusCode < 100 || $statusCode >= 200) {
$this->headersSent = true;
}
return parent::sendHeaders($statusCode);
}
/**
* This method only sends the content once.
*
* @return $this
*/
public function sendContent(): static
{
if ($this->streamed) {
return $this;
}
$this->streamed = true;
if (!isset($this->callback)) {
throw new \LogicException('The Response callback must be set.');
}
($this->callback)();
return $this;
}
/**
* @return $this
*
* @throws \LogicException when the content is not null
*/
public function setContent(?string $content): static
{
if (null !== $content) {
throw new \LogicException('The content cannot be set on a StreamedResponse instance.');
}
$this->streamed = true;
return $this;
}
public function getContent(): string|false
{
return false;
}
}