AsyncSockets\Socket\AbstractSocket

Complexity

Total Complexity

18

Size/Duplication

Total Lines	210
Duplicated Lines	0 %

Coupling/Cohesion

Components	1
Dependencies	4

Test Coverage

Coverage

100%

Importance

Changes

0

11 Methods

Rating	Name	Duplication	Size	Complexity
A	__construct()	0	5	1
A	setDisconnectedState()	0	4	1
B	open()	0	30	3
A	close()	0	10	2
A	read()	0	9	2
A	write()	0	9	2
A	getStreamResource()	0	4	1
A	__toString()	0	10	2
	createSocketResource()	0	1	?
	createIoInterface()	0	1	?
B	resolveSocketType()	0	24	4

<?php
/**
 * Async sockets
 *
 * @copyright Copyright (c) 2015-2017, Efimov Evgenij <edefimov.it@gmail.com>
 *
 * This source file is subject to the MIT license that is bundled
 * with this source code in the file LICENSE.
 */

namespace AsyncSockets\Socket;

use AsyncSockets\Exception\ConnectionException;
use AsyncSockets\Frame\FramePickerInterface;
use AsyncSockets\Socket\Io\Context;
use AsyncSockets\Socket\Io\DisconnectedIo;
use AsyncSockets\Socket\Io\IoInterface;

/**
 * Class AbstractSocket
 */
abstract class AbstractSocket implements SocketInterface
{
    /**
     * Tcp socket type
     */
    const SOCKET_TYPE_TCP = 'tcp';

    /**
     * Udp socket type
     */
    const SOCKET_TYPE_UDP = 'udp';

    /**
     * Unix socket type
     */
    const SOCKET_TYPE_UNIX = 'unix';

    /**
     * Unix datagram socket type
     */
    const SOCKET_TYPE_UDG = 'udg';

    /**
     * Unknown type of socket
     */
    const SOCKET_TYPE_UNKNOWN = '';

    /**
     * This socket resource
     *
     * @var resource
     */
    private $resource;

    /**
     * I/O interface
     *
     * @var IoInterface
     */
    private $ioInterface;

    /**
     * Socket address
     *
     * @var string
     */
    private $remoteAddress;

    /**
     * Context for this socket
     *
     * @var Context
     */
    private $context;

    /**
     * AbstractSocket constructor.
     */
    public function __construct()
    {
        $this->setDisconnectedState();
        $this->context = new Context();
    }

    /**
     * Set disconnected state for socket
     *
     * @return void
     */
    private function setDisconnectedState()
    {
        $this->ioInterface = new DisconnectedIo($this);
    }

    /** {@inheritdoc} */
    public function open($address, $context = null)
    {
        $this->resource = $this->createSocketResource(
            $address,
            $context ?: stream_context_get_default()
        );

        if (!is_resource($this->resource)) {
            throw new ConnectionException(
                $this,
                'Can not allocate socket resource.'
            );
        }

        $this->remoteAddress = $address;

        // https://bugs.php.net/bug.php?id=51056
        stream_set_blocking($this->resource, 0);

        // https://bugs.php.net/bug.php?id=52602
        stream_set_timeout($this->resource, 0, 0);
        stream_set_chunk_size($this->resource, IoInterface::SOCKET_BUFFER_SIZE);

        $this->ioInterface = $this->createIoInterface(
            $this->resolveSocketType(),
            $address
        );

        $this->context->reset();
    }

    /** {@inheritdoc} */
    public function close()
    {
        if ($this->resource) {
            $this->setDisconnectedState();
            stream_socket_shutdown($this->resource, STREAM_SHUT_RDWR);
            fclose($this->resource);
            $this->resource      = null;
            $this->remoteAddress = null;
        }
    }

    /** {@inheritdoc} */
    public function read(FramePickerInterface $picker, $isOutOfBand = false)
    {
        try {
            return $this->ioInterface->read($picker, $this->context, $isOutOfBand);
        } catch (ConnectionException $e) {
            $this->setDisconnectedState();
            throw $e;
        }
    }

    /** {@inheritdoc} */
    public function write($data, $isOutOfBand = false)
    {
        try {
            return $this->ioInterface->write($data, $this->context, $isOutOfBand);
        } catch (ConnectionException $e) {
            $this->setDisconnectedState();
            throw $e;
        }
    }

    /** {@inheritdoc} */
    public function getStreamResource()
    {
        return $this->resource;
    }

    /**
     * @inheritDoc
     */
    public function __toString()
    {
        return $this->remoteAddress ?
            sprintf(
                '[#%s, %s]',
                preg_replace('/Resource id #(\d+)/i', '$1', (string) $this->resource),
                $this->remoteAddress
            ) :
            '[closed socket]';
    }

    /**
     * Create certain socket resource
     *
     * @param string   $address Network address to open in form transport://path:port
     * @param resource $context Valid stream context created by function stream_context_create or null
     *
     * @return resource
     */
    abstract protected function createSocketResource($address, $context);

    /**
     * Create I/O interface for socket
     *
     * @param string $type Type of this socket, one of SOCKET_TYPE_* consts
     * @param string $address Address passed to open method
     *
     * @return IoInterface
     */
    abstract protected function createIoInterface($type, $address);

    /**
     * Get current socket type
     *
     * @return string One of SOCKET_TYPE_* consts
     */
    private function resolveSocketType()
    {
        $info = stream_get_meta_data($this->resource);
        if (!isset($info['stream_type'])) {
            return self::SOCKET_TYPE_UNKNOWN;
        }

        $parts = explode('/', $info['stream_type']);
        $map   = [
            'tcp'  => self::SOCKET_TYPE_TCP,
            'udp'  => self::SOCKET_TYPE_UDP,
            'udg'  => self::SOCKET_TYPE_UDG,
            'unix' => self::SOCKET_TYPE_UNIX,
        ];

        $regexp = '#^('. implode('|', array_keys($map)) . ')_socket$#';
        foreach ($parts as $part) {
            if (preg_match($regexp, $part, $pockets)) {
                return $map[$pockets[1]];
            }
        }

        return self::SOCKET_TYPE_UNKNOWN;
    }
}