protected override async Task<SourceConnectionClient> DoConnect(Uri source, CancellationToken cancellationToken)
{
TcpClient client = null;
var bind_addr = GetBindAddresses(source);
if (bind_addr.Count()==0) {
this.state = ConnectionState.Error;
throw new BindErrorException(String.Format("Cannot resolve bind address: {0}", source.DnsSafeHost));
}
var listeners = bind_addr.Select(addr => new TcpListener(addr)).ToArray();
try {
var cancel_task = cancellationToken.CreateCancelTask<TcpClient>();
var tasks = listeners.Select(listener => {
listener.Start(1);
Logger.Debug("Listening on {0}", listener.LocalEndpoint);
return listener.AcceptTcpClientAsync();
}).Concat(Enumerable.Repeat(cancel_task, 1)).ToArray();
var result = await Task.WhenAny(tasks);
if (!result.IsCanceled) {
client = result.Result;
Logger.Debug("Client accepted");
}
else {
Logger.Debug("Listen cancelled");
}
}
catch (SocketException) {
this.state = ConnectionState.Error;
throw new BindErrorException(String.Format("Cannot bind address: {0}", bind_addr));
}
finally {
foreach (var listener in listeners) {
listener.Stop();
}
}
if (client!=null) {
return new SourceConnectionClient(client);
}
else {
return null;
}
}
