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POHow to build a robust/scalable async await echo server?
 

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  1. POHow to build a robust/scalable async await echo server?
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    <p>Im building a simple TCP client and server as a basis for my networking project. Im planning to use the async await technique for future proof and scaleable server.</p> <p>If I put wrong ip address, the client cant connect to my server and throw an exception. I can catch the exception using try/catch but is that the recommended way to do?</p> <p>What do you guys think of the implementation. Any comments for me to improve?</p> <p>My server </p> <pre><code> private void startServer_Click(object sender, RoutedEventArgs e) { if (anyIP.IsChecked == true) { listener = new TcpListener(IPAddress.Any, Int32.Parse(serverPort.Text)); Logger.Info("Ip Address : " + IPAddress.Any + " Port : " + serverPort.Text); } else { listener = new TcpListener(IPAddress.Parse(serverIP.Text), Int32.Parse(serverPort.Text)); Logger.Info("Ip Address : " + serverIP.Text + " Port : " + serverPort.Text); } try { listener.Start(); Logger.Info("Listening"); HandleConnectionAsync(listener, cts.Token); } //finally //{ //cts.Cancel(); //listener.Stop(); //Logger.Info("Stop listening"); //} //cts.Cancel(); } async Task HandleConnectionAsync(TcpListener listener, CancellationToken ct) { while (!ct.IsCancellationRequested) { Logger.Info("Accepting client"); //TcpClient client = await listener.AcceptTcpClientAsync(); TcpClient client = await listener.AcceptTcpClientAsync(); Logger.Info("Client accepted"); EchoAsync(client, ct); } } async Task EchoAsync(TcpClient client, CancellationToken ct) { var buf = new byte[4096]; var stream = client.GetStream(); while (!ct.IsCancellationRequested) { var amountRead = await stream.ReadAsync(buf, 0, buf.Length, ct); Logger.Info("Receive " + stream.ToString()); if (amountRead == 0) break; //end of stream. await stream.WriteAsync(buf, 0, amountRead, ct); Logger.Info("Echo to client"); } } private void stopServer_Click(object sender, RoutedEventArgs e) { cts.Cancel(); listener.Stop(); Logger.Info("Stop listening"); } </code></pre> <p>My client</p> <pre><code> private void connect_Click(object sender, System.Windows.RoutedEventArgs e) { IPAddress ipAddress; int port; //TODO Check if ip address is valid ipAddress = IPAddress.Parse(serverIP.Text); //TODO port range is 0-65000 port = int.Parse(serverPort.Text); StartClient(ipAddress, port); } private static async void StartClient(IPAddress serverIpAddress, int port) { var client = new TcpClient(); //can i try/catch to catch await exception? try { await client.ConnectAsync(serverIpAddress, port); } catch (Exception e) { Logger.Info(e); } Logger.Info("Connected to server"); using (var networkStream = client.GetStream()) using (var writer = new StreamWriter(networkStream)) using (var reader = new StreamReader(networkStream)) { writer.AutoFlush = true; for (int i = 0; i &lt; 10; i++) { Logger.Info("Writing to server"); await writer.WriteLineAsync(DateTime.Now.ToLongDateString()); Logger.Info("Reading from server"); var dataFromServer = await reader.ReadLineAsync(); if (!string.IsNullOrEmpty(dataFromServer)) { Logger.Info(dataFromServer); } } } if (client != null) { client.Close(); Logger.Info("Connection closed"); } } </code></pre>
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    1. PTQuestion
    1. USSyaiful Nizam Yahya
    1. USSyaiful Nizam Yahya
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    1. COActually it seems like the port is 6666, not 4502?
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      1. POHow to build a robust/scalable async await echo server?
      1. UScarlpett
    2. COyou were right. my bad. please excuse. thanks.
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      1. POHow to build a robust/scalable async await echo server?
      1. USSyaiful Nizam Yahya
    3. COFixed my typo. I still cant connect on 127.0.0.1(localhost).
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      1. POHow to build a robust/scalable async await echo server?
      1. USSyaiful Nizam Yahya
 

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