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<?php |
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namespace Thruster\Component\SocketClient; |
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use Thruster\Component\EventLoop\EventLoopInterface; |
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use Thruster\Component\Promise\Deferred; |
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use Thruster\Component\Promise\FulfilledPromise; |
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use Thruster\Component\Promise\PromiseInterface; |
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use Thruster\Component\Promise\RejectedPromise; |
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use Thruster\Component\SocketClient\Exception\ConnectionException; |
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use Thruster\Component\Stream\Stream; |
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/** |
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* Class TcpConnector |
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* |
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* @package Thruster\Component\SocketClient |
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* @author Aurimas Niekis <[email protected]> |
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*/ |
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class TcpConnector implements ConnectorInterface |
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{ |
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/** |
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* @var EventLoopInterface |
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*/ |
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private $loop; |
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public function __construct(EventLoopInterface $loop) |
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{ |
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$this->loop = $loop; |
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} |
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public function create(string $ip, int $port) : PromiseInterface |
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{ |
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if (false === filter_var($ip, FILTER_VALIDATE_IP)) { |
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return new RejectedPromise( |
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new \InvalidArgumentException( |
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sprintf( |
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'Given parameter "%s" is not a valid IP', |
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$ip |
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) |
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) |
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); |
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} |
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$url = $this->getSocketUrl($ip, $port); |
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$socket = @stream_socket_client($url, $errNo, $errStr, 0, STREAM_CLIENT_CONNECT | STREAM_CLIENT_ASYNC_CONNECT); |
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if (false === $socket) { |
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return new RejectedPromise( |
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new \RuntimeException( |
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sprintf("Connection to %s:%d failed: %s", $ip, $port, $errStr), |
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$errNo |
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) |
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); |
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} |
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stream_set_blocking($socket, 0); |
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// wait for connection |
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return $this |
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->waitForStreamOnce($socket) |
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->then([$this, 'checkConnectedSocket']) |
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->then([$this, 'handleConnectedSocket']); |
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} |
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private function waitForStreamOnce($stream) : PromiseInterface |
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{ |
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$deferred = new Deferred(); |
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$this->loop->addWriteStream($stream, function ($stream) use ($deferred) { |
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$this->loop->removeWriteStream($stream); |
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$deferred->resolve($stream); |
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}); |
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return $deferred->promise(); |
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} |
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public function checkConnectedSocket($socket) : PromiseInterface |
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{ |
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// The following hack looks like the only way to |
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// detect connection refused errors with PHP's stream sockets. |
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if (false === stream_socket_get_name($socket, true)) { |
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return new RejectedPromise( |
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new ConnectionException('Connection refused') |
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); |
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} |
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return new FulfilledPromise($socket); |
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} |
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public function handleConnectedSocket($socket) : Stream |
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{ |
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return new Stream($socket, $this->loop); |
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} |
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private function getSocketUrl(string $ip, int $port) : string |
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{ |
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if (false !== strpos($ip, ':')) { |
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// enclose IPv6 addresses in square brackets before appending port |
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$ip = '[' . $ip . ']'; |
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} |
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return 'tcp://' . $ip . ':' . $port; |
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} |
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} |
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ThrusterIO /
socket-client
