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<?php

declare(strict_types=1);

namespace Docker\Stream;

use Psr\Http\Message\StreamInterface;

class DockerRawStream

{

public const HEADER = 'application/vnd.docker.raw-stream';

/** @var StreamInterface Stream for the response */

protected $stream;

/** @var callable[] A list of callable to call when there is a stdin output */

protected $onStdinCallables = [];

/** @var callable[] A list of callable to call when there is a stdout output */

protected $onStdoutCallables = [];

/** @var callable[] A list of callable to call when there is a stderr output */

protected $onStderrCallables = [];

public function __construct(StreamInterface $stream)

{

$this->stream = $stream;

}

/**

* Add a callable to read stdin.

*

* @param callable $callback

*/

public function onStdin(callable $callback): void

{

$this->onStdinCallables[] = $callback;

}

/**

* Add a callable to read stdout.

*

* @param callable $callback

*/

public function onStdout(callable $callback): void

{

$this->onStdoutCallables[] = $callback;

}

/**

* Add a callable to read stderr.

*

* @param callable $callback

*/

public function onStderr(callable $callback): void

{

$this->onStderrCallables[] = $callback;

}

/**

* Read a frame in the stream.

*/

protected function readFrame(): void

{

$header = $this->forceRead(8);

if (\strlen($header) < 8) {

return;

}

$decoded = \unpack('C1type/C3/N1size', $header);

$output = $this->forceRead($decoded['size']);

$callbackList = [];

if (0 === $decoded['type']) {

$callbackList = $this->onStdinCallables;

}

if (1 === $decoded['type']) {

$callbackList = $this->onStdoutCallables;

}

if (2 === $decoded['type']) {

$callbackList = $this->onStderrCallables;

}

foreach ($callbackList as $callback) {

$callback($output);

}

}

/**

* Force to have something of the expected size (block).

*

* @param $length

*

* @return string

*/

private function forceRead($length)

{

$read = '';

do {

$read .= $this->stream->read($length - \strlen($read));

} while (\strlen($read) < $length && !$this->stream->eof());

return $read;

}

/**

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

*/

public function wait(): void

{

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

$this->readFrame();

}

}

}