Exemplo n.º 1
0
 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;
   }
 }