private async void ListenerOnMessageReceived(DatagramSocket sender, DatagramSocketMessageReceivedEventArgs args)
{
object outObj;
if (CoreApplication.Properties.TryGetValue("remotePeer", out outObj))
{
EchoMessage((RemotePeer)outObj, args);
return;
}
// We do not have an output stream yet so create one.
try
{
IOutputStream outputStream = await listener.GetOutputStreamAsync(args.RemoteAddress, args.RemotePort);
// It might happen that the OnMessage was invoked more than once before the GetOutputStreamAsync completed.
// In this case we will end up with multiple streams - make sure we have just one of it.
RemotePeer peer;
lock (this)
{
if (CoreApplication.Properties.TryGetValue("remotePeer", out outObj))
{
peer = (RemotePeer)outObj;
}
else
{
peer = new RemotePeer(outputStream, args.RemoteAddress, args.RemotePort);
CoreApplication.Properties.Add("remotePeer", peer);
}
}
EchoMessage(peer, args);
}
catch (Exception exception)
{
// If this is an unknown status it means that the error is fatal and retry will likely fail.
if (SocketError.GetStatus(exception.HResult) == SocketErrorStatus.Unknown)
{
throw;
}
// NotifyUserFromAsyncThread("Connect failed with error: " + exception.Message, NotifyType.ErrorMessage);
}
}
private async void ListenerOnMessageReceived(DatagramSocket sender, DatagramSocketMessageReceivedEventArgs args)
{
object outObj;
if (CoreApplication.Properties.TryGetValue("remotePeer", out outObj))
{
EchoMessage((RemotePeer)outObj, args);
return;
}
// We do not have an output stream yet so create one.
try
{
IOutputStream outputStream = await listener.GetOutputStreamAsync(args.RemoteAddress, args.RemotePort);
// It might happen that the OnMessage was invoked more than once before the GetOutputStreamAsync completed.
// In this case we will end up with multiple streams - make sure we have just one of it.
RemotePeer peer;
lock (this)
{
if (CoreApplication.Properties.TryGetValue("remotePeer", out outObj))
{
peer = (RemotePeer)outObj;
}
else
{
peer = new RemotePeer(outputStream, args.RemoteAddress, args.RemotePort);
CoreApplication.Properties.Add("remotePeer", peer);
}
}
EchoMessage(peer, args);
}
catch (Exception exception)
{
// If this is an unknown status it means that the error is fatal and retry will likely fail.
if (SocketError.GetStatus(exception.HResult) == SocketErrorStatus.Unknown)
{
throw;
}
// NotifyUserFromAsyncThread("Connect failed with error: " + exception.Message, NotifyType.ErrorMessage);
}
}
async void EchoMessage(RemotePeer peer, DatagramSocketMessageReceivedEventArgs eventArguments)
{
if (!peer.IsMatching(eventArguments.RemoteAddress, eventArguments.RemotePort))
{
// In the sample we are communicating with just one peer. To communicate with multiple peers application
// should cache output streams (i.e. by using a hash map), because creating an output stream for each
// received datagram is costly. Keep in mind though, that every cache requires logic to remove old
// or unused elements; otherwise cache turns into a memory leaking structure.
//NotifyUserFromAsyncThread(String.Format("Got datagram from {0}:{1}, but already 'connected' to {3}", eventArguments.RemoteAddress, eventArguments.RemotePort, peer), NotifyType.ErrorMessage);
}
try
{
var reader = eventArguments.GetDataReader();
var size = reader.UnconsumedBufferLength;
StringBuilder sb = new StringBuilder();
while (reader.UnconsumedBufferLength > 0)
{
var b = reader.ReadByte();
sb.Append((char) b);
}
var msg = sb.ToString();
if (msg.StartsWith("VS:"))
{
msg = msg.Substring(3);
var colon = msg.IndexOf(':');
var typename = msg.Substring(0, colon);
var equals = msg.IndexOf('=');
var ip = msg.Substring(colon + 1, equals - colon - 1);
var name = msg.Substring(equals + 1);
var colon2 = name.IndexOf(':');
if (colon2 > -1)
{
name = name.Substring(0, colon2);
}
if (string.IsNullOrWhiteSpace(name))
{
name = $"({typename}):{ip}";
}
var port = peer.Port;
var portColon = ip.IndexOf(':');
if (portColon > -1)
{
port = ip.Substring(portColon + 1);
ip = ip.Substring(0, portColon);
}
peer.IP = ip;
peer.Name = name;
peer.Message = msg;
peer.Pinged = DateTime.Now;
peer.OriginalPort = peer.Port;
peer.Port = port;
var connection = new Connection(name, peer);
if (!clients.ContainsKey(ip))
{
clients[ip] = connection;
}
}
}
catch (Exception exception)
{
// If this is an unknown status it means that the error is fatal and retry will likely fail.
if (SocketError.GetStatus(exception.HResult) == SocketErrorStatus.Unknown)
{
throw;
}
}
}
async void EchoMessage(RemotePeer peer, DatagramSocketMessageReceivedEventArgs eventArguments)
{
if (!peer.IsMatching(eventArguments.RemoteAddress, eventArguments.RemotePort))
{
// In the sample we are communicating with just one peer. To communicate with multiple peers application
// should cache output streams (i.e. by using a hash map), because creating an output stream for each
// received datagram is costly. Keep in mind though, that every cache requires logic to remove old
// or unused elements; otherwise cache turns into a memory leaking structure.
//NotifyUserFromAsyncThread(String.Format("Got datagram from {0}:{1}, but already 'connected' to {3}", eventArguments.RemoteAddress, eventArguments.RemotePort, peer), NotifyType.ErrorMessage);
}
try
{
var reader = eventArguments.GetDataReader();
var size = reader.UnconsumedBufferLength;
StringBuilder sb = new StringBuilder();
while (reader.UnconsumedBufferLength > 0)
{
var b = reader.ReadByte();
sb.Append((char)b);
}
var msg = sb.ToString();
if (msg.StartsWith("VS:"))
{
msg = msg.Substring(3);
var colon = msg.IndexOf(':');
var typename = msg.Substring(0, colon);
var equals = msg.IndexOf('=');
var ip = msg.Substring(colon + 1, equals - colon - 1);
var name = msg.Substring(equals + 1);
var colon2 = name.IndexOf(':');
if (colon2 > -1)
{
name = name.Substring(0, colon2);
}
if (string.IsNullOrWhiteSpace(name))
{
name = $"({typename}):{ip}";
}
var port = peer.Port;
var portColon = ip.IndexOf(':');
if (portColon > -1)
{
port = ip.Substring(portColon + 1);
ip = ip.Substring(0, portColon);
}
peer.IP = ip;
peer.Name = name;
peer.Message = msg;
peer.Pinged = DateTime.Now;
peer.OriginalPort = peer.Port;
peer.Port = port;
var connection = new Connection(name, peer);
if (!clients.ContainsKey(ip))
{
clients[ip] = connection;
}
}
}
catch (Exception exception)
{
// If this is an unknown status it means that the error is fatal and retry will likely fail.
if (SocketError.GetStatus(exception.HResult) == SocketErrorStatus.Unknown)
{
throw;
}
}
}
