private async Task <IObservable <IHttpRequestReponse> > GetUdpRequestResponseObservable(
int port,
ICommunicationInterface communicationInterface = null,
bool allowMultipleBindToSamePort = false)
{
IUdpSocketReceiver udpListener = new UdpSocketReceiver();
var observeUdpRequest = await udpListener.ObservableUnicastListener(
port,
communicationInterface,
allowMultipleBindToSamePort);
var observable = Observable.Create <IHttpRequestReponse>(
obs =>
{
var disp = observeUdpRequest.Subscribe(
udpSocket =>
{
var stream = new MemoryStream(udpSocket.ByteData);
var requestHandler = new HttpParserDelegate
{
HttpRequestReponse =
{
RemoteAddress = udpSocket.RemoteAddress,
RemotePort = int.Parse(udpSocket.RemotePort),
RequestType = RequestType.UDP
}
};
var result = _httpStreamParser.Parse(requestHandler, stream, Timeout);
obs.OnNext(result);
},
ex =>
{
Cleanup();
obs.OnError(ex);
},
() =>
{
Cleanup();
obs.OnCompleted();
});
return(disp);
void Cleanup()
{
_udpReceiverPortToObservable.Remove(port);
udpListener.Dispose();
}
});
return(observable);
}
public static async Task <DnsServer> Create(string ip, int port, IRecordResolver recordResolver, IAuthority areWeAuthority, IExceptionHandler onError)
{
var networkInterface = Network.Interfaces.FirstOrDefault(x => x.IpAddress == ip);
var udpReceiver = new UdpSocketReceiver();
var observerUdpReceiver = await udpReceiver.ObservableUnicastListener(
port : port,
communicationInterface : networkInterface,
allowMultipleBindToSamePort : false);
var subscriberUpdReceiver = observerUdpReceiver.Subscribe(
async udpMsg =>
{
var req = Reader.ReadRequest(new MemoryStream(udpMsg.ByteData));
var response = new Response(req);
foreach (var q in req)
{
var record = recordResolver.Resolve(q.Class, q.Type, q.Name);
if (record == null)
{
continue;
}
if (areWeAuthority?.AreWeAuthority(q.Name) ?? false)
{
response.Authorities.Add(record);
}
else
{
response.Answers.Add(record);
}
}
await udpReceiver.SendToAsync(Writer.Serialize(response), udpMsg.RemoteAddress, int.Parse(udpMsg.RemotePort));
},
x => onError?.OnError(x));
return(new UDPServer
{
udpReceiver = udpReceiver,
observerUdpReceiver = observerUdpReceiver,
subscriberUpdReceiver = subscriberUpdReceiver,
RecordResolver = recordResolver
});
}