/**
* {@inheritdoc}
*/
public function resolve(string $host) : Awaitable
{
$host = \strtolower(\trim($host, '[]'));
if ($host === 'localhost') {
return new Success(new Address('::1', '127.0.0.1'));
}
if (Address::isResolved($host)) {
return new Success(new Address($host));
}
if (isset($this->hosts[$host])) {
return new Success($this->hosts[$host]);
}
if (isset($this->cache[$host]) && \time() < $this->cache[$host]['expires']) {
return new Success($this->cache[$host]['address']);
}
if (!isset($this->pending[$host])) {
$this->pending[$host] = $resolver = new Coroutine($this->resolveHost($host));
$resolver->when(function (\Throwable $e = null, array $val = null) use($host) {
unset($this->pending[$host]);
if ($val) {
$this->cache[$host] = $val;
}
});
}
return new Task(new Transform($this->pending[$host], function (array $result) {
return $result['address'];
}));
}
/**
* {@inheritdoc}
*/
public function resolve(string $host) : Awaitable
{
$host = \strtolower(\trim($host, '[]'));
if ($host === 'localhost') {
return new Success(new Address('::1', '127.0.0.1'));
}
if (Address::isResolved($host)) {
return new Success(new Address($host));
}
return $this->loop->handleCallback('uv_getaddrinfo', function ($result, array $ips) use($host) {
if ($result < 0) {
throw new \RuntimeException(\sprintf('Could not resolve "%s" into an IP address', $host));
}
return new Address(...$ips);
}, $host, '', []);
}
/**
* Set all DNS nameservers to be used.
*
* @param array $servers DNS server addresses including UDP port number
*
* @throws \InvalidArgumentException When a server entry is invalid or cannot be resolved into an IP address.
*/
public function setNameservers(array $servers)
{
$result = [];
foreach ($servers as $host) {
if (false === ($index = \strrpos($host, ':'))) {
throw new \InvalidArgumentException(\sprintf('No DNS server UDP port number specified (default port is 53): "%s"', $host));
}
$address = \substr($host, 0, $index);
$port = \substr($host, $index + 1);
if (!\preg_match("'[1-9][0-9]*'", $port)) {
throw new \InvalidArgumentException(\sprintf('Invalid DNS server port number: "%s"', $port));
}
if (!Address::isResolved($address)) {
$ips = \gethostbynamel($address);
if (empty($ips)) {
throw new \InvalidArgumentException(\sprintf('Cannot resolve DNS server into an IP address: "%s"', $address));
}
foreach ($ips as $ip) {
$result[] = \sprintf('%s:%u', $ip, $port);
}
} else {
$result[] = $host;
}
}
$this->nameservers = $result;
}
protected function connectSocket(Uri $uri) : Awaitable
{
$host = $uri->getHost();
if (Address::isResolved($host)) {
$factory = new SocketFactory(new Address($host) . ':' . $uri->getPort(), 'tcp');
} else {
$factory = new SocketFactory($uri->getHostWithPort(true), 'tcp');
}
$factory->setTcpNoDelay(true);
if ($this->protocols && Socket::isAlpnSupported()) {
$factory->setOption('ssl', 'alpn_protocols', \implode(',', $this->protocols));
}
return $factory->createSocketStream(5, $uri->getScheme() === 'https');
}
