Docker\Stream\DockerRawStream

Complexity

Total Complexity

15

Size/Duplication

Total Lines	111
Duplicated Lines	0 %

Coupling/Cohesion

Components	1
Dependencies	1

Test Coverage

Coverage

76.19%

Importance

Changes	3
Bugs	0	Features	1

7 Methods

Rating	Name	Duplication	Size	Complexity
A	__construct()	0	4	1
A	onStdin()	0	4	1
A	onStdout()	0	4	1
A	onStderr()	0	4	1
B	readFrame()	0	28	6
A	forceRead()	0	10	3
A	wait()	0	6	2

<?php

namespace Docker\Stream;

use Psr\Http\Message\StreamInterface;

class DockerRawStream
{
    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)
    {
        $this->onStdinCallables[] = $callback;
    }

    /**
     * Add a callable to read stdout
     *
     * @param callable $callback
     */
    public function onStdout(callable $callback)
    {
        $this->onStdoutCallables[] = $callback;
    }

    /**
     * Add a callable to read stderr
     *
     * @param callable $callback
     */
    public function onStderr(callable $callback)
    {
        $this->onStderrCallables[] = $callback;
    }

    /**
     * Read a frame in the stream
     */
    protected function readFrame()
    {
        $header  = $this->forceRead(8);

        if (strlen($header) < 8) {
            return;
        }

        $decoded = unpack('C1type/C3/N1size', $header);
        $output  = $this->forceRead($decoded['size']);
        $callbackList = [];

        if ($decoded['type'] == 0) {
            $callbackList = $this->onStdinCallables;
        }

        if ($decoded['type'] == 1) {
            $callbackList = $this->onStdoutCallables;
        }

        if ($decoded['type'] == 2) {
            $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()
    {
        while (!$this->stream->eof()) {
            $this->readFrame();
        }
    }
}