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|
<?php
namespace React\Socket;
use React\EventLoop\LoopInterface;
use React\Promise;
use InvalidArgumentException;
use RuntimeException;
final class TcpConnector implements ConnectorInterface
{
private $loop;
private $context;
public function __construct(LoopInterface $loop, array $context = array())
{
$this->loop = $loop;
$this->context = $context;
}
public function connect($uri)
{
if (strpos($uri, '://') === false) {
$uri = 'tcp://' . $uri;
}
$parts = parse_url($uri);
if (!$parts || !isset($parts['scheme'], $parts['host'], $parts['port']) || $parts['scheme'] !== 'tcp') {
return Promise\reject(new InvalidArgumentException('Given URI "' . $uri . '" is invalid'));
}
$ip = trim($parts['host'], '[]');
if (false === filter_var($ip, FILTER_VALIDATE_IP)) {
return Promise\reject(new InvalidArgumentException('Given URI "' . $ip . '" does not contain a valid host IP'));
}
// use context given in constructor
$context = array(
'socket' => $this->context
);
// parse arguments from query component of URI
$args = array();
if (isset($parts['query'])) {
parse_str($parts['query'], $args);
}
// If an original hostname has been given, use this for TLS setup.
// This can happen due to layers of nested connectors, such as a
// DnsConnector reporting its original hostname.
// These context options are here in case TLS is enabled later on this stream.
// If TLS is not enabled later, this doesn't hurt either.
if (isset($args['hostname'])) {
$context['ssl'] = array(
'SNI_enabled' => true,
'peer_name' => $args['hostname']
);
// Legacy PHP < 5.6 ignores peer_name and requires legacy context options instead.
// The SNI_server_name context option has to be set here during construction,
// as legacy PHP ignores any values set later.
if (PHP_VERSION_ID < 50600) {
$context['ssl'] += array(
'SNI_server_name' => $args['hostname'],
'CN_match' => $args['hostname']
);
}
}
// latest versions of PHP no longer accept any other URI components and
// HHVM fails to parse URIs with a query but no path, so let's simplify our URI here
$remote = 'tcp://' . $parts['host'] . ':' . $parts['port'];
$socket = @stream_socket_client(
$remote,
$errno,
$errstr,
0,
STREAM_CLIENT_CONNECT | STREAM_CLIENT_ASYNC_CONNECT,
stream_context_create($context)
);
if (false === $socket) {
return Promise\reject(new RuntimeException(
sprintf("Connection to %s failed: %s", $uri, $errstr),
$errno
));
}
stream_set_blocking($socket, 0);
// wait for connection
return $this->waitForStreamOnce($socket);
}
private function waitForStreamOnce($stream)
{
$loop = $this->loop;
return new Promise\Promise(function ($resolve, $reject) use ($loop, $stream) {
$loop->addWriteStream($stream, function ($stream) use ($loop, $resolve, $reject) {
$loop->removeWriteStream($stream);
// The following hack looks like the only way to
// detect connection refused errors with PHP's stream sockets.
if (false === stream_socket_get_name($stream, true)) {
fclose($stream);
$reject(new RuntimeException('Connection refused'));
} else {
$resolve(new Connection($stream, $loop));
}
});
}, function () use ($loop, $stream) {
$loop->removeWriteStream($stream);
fclose($stream);
throw new RuntimeException('Cancelled while waiting for TCP/IP connection to be established');
});
}
}
|
