private async void handleConnection(TcpClient connection)
{
var ep = connection.Client.RemoteEndPoint;
Console.WriteLine("New Connection from {0}", ep);
NetworkStream stream = connection.GetStream();
MqttMessage message = await MqttMessage.Read(stream, 5);
if (message.Type != MessageType.Connect)
{
throw new MqttProtocolException("First packet not connect");
}
//TODO: Non-clean sessions
ConnAckMessage connAck = new ConnAckMessage(0, false);
await connAck.Write(stream);
ConnectMessage connectMessage = (ConnectMessage)message;
double keepalive = ((ConnectMessage)message).KeepAlive * 1.5;
String clientId = ((ConnectMessage)message).ClientId;
if (String.IsNullOrEmpty(clientId))
{
clientId = Guid.NewGuid().ToString();
}
IMqttSession session = await sessionProvider.NewSession(clientId);
Console.WriteLine("Client {0} connected from {1} ({2},{3})", clientId, ep, connectMessage.CleanSession, connectMessage.KeepAlive);
connections.Add(session, connection);
Task <MqttMessage> incoming = MqttMessage.Read(stream);
Task <PendingMessage> outgoing = session.NextPending(null, 0);
while (connection.Connected)
{
try
{
if (await Task.WhenAny(incoming, outgoing) == incoming)
{
try
{
message = incoming.Result;
}
catch (AggregateException e)
{
Console.WriteLine(e.InnerException.Message);
connections.Remove(session);
connection.Close();
continue;
}
catch (Exception e)
{
Console.WriteLine(e.Message);
connections.Remove(session);
connection.Close();
continue;
}
switch (message.Type)
{
case MessageType.Publish:
await PublishReceived(session, stream, (PublishMessage)message);
break;
case MessageType.Disconnect:
Console.WriteLine("Client {0} disconnected cleanly", clientId);
connections.Remove(session);
connection.Close();
//Skip reading the next message. Loop should exit.
continue;
case MessageType.Subscribe:
await SubscribeReceived(session, stream, (SubscribeMessage)message);
break;
case MessageType.Unsubscribe:
await sessionProvider.RemoveSubscriptions(session, ((UnsubscribeMessage)message).TopicFilters);
await new UnsubAckMessage(((UnsubscribeMessage)message).PacketId).Write(stream);
break;
case MessageType.PubAck:
string messageId = await session.PublishAcknowledged(((PubAckMessage)message).PacketId);
if (messageId != null)
{
await storageProvider.ReleaseMessage(messageId);
}
break;
case MessageType.PubRec:
messageId = await session.PublishReceived(((PubRecMessage)message).PacketId);
if (messageId != null)
{
await storageProvider.ReleaseMessage(messageId);
}
break;
case MessageType.PubRel:
await session.RemoveQoS2(((PubRelMessage)message).PacketId);
await new PubCompMessage(((PubRelMessage)message).PacketId).Write(stream);
break;
case MessageType.PubComp:
await session.PublishCompleted(((PubCompMessage)message).PacketId);
break;
case MessageType.PingReq:
await new PingRespMessage().Write(stream);
break;
}
incoming = MqttMessage.Read(stream);
}
else
{
PendingMessage pendingMessage = outgoing.Result;
PendingPublishMessage pendingPublish = pendingMessage as PendingPublishMessage;
if (pendingPublish != null)
{
var messageInfo = await storageProvider.GetMessage(pendingPublish.MessageId);
message = new PublishMessage(pendingPublish.Duplicate, false, pendingPublish.QoS, messageInfo.Topic, messageInfo.Payload, pendingPublish.PacketId);
}
else
{
message = new PubRelMessage(pendingMessage.PacketId);
}
await message.Write(stream);
outgoing = session.NextPending(pendingMessage, 5000);
}
}
catch (Exception e)
{
Console.Out.WriteLine(e.Message);
}
}
await sessionProvider.CloseSession(session);
}