<?php

declare(strict_types=1);

namespace Docker\Stream;

use Psr\Http\Message\StreamInterface;

abstract class CallbackStream

{

protected $stream;

private $onNewFrameCallables = [];

public function __construct(StreamInterface $stream)

{

$this->stream = $stream;

}

/**

* Called when there is a new frame from the stream.

*

* @param callable $onNewFrame

*/

public function onFrame(callable $onNewFrame): void

{

$this->onNewFrameCallables[] = $onNewFrame;

}

/**

* Read a frame in the stream.

*

* @return mixed

*/

abstract protected function readFrame();

/**

* Wait for stream to finish and call callables if defined.

*/

public function wait(): void

{

while (!$this->stream->eof()) {

$frame = $this->readFrame();

if (null !== $frame) {

if (!\is_array($frame)) {

$frame = [$frame];

}

foreach ($this->onNewFrameCallables as $newFrameCallable) {

\call_user_func_array($newFrameCallable, $frame);

}

}

}

}

public function closeAndRead(): void

{

$this->stream->close();

$this->wait();

}

}