/// <summary>
/// Do handshake for client side.
/// </summary>
/// <param name="clientSocket"> Socket from client side to server side</param>
/// <returns>null if handShake fail otherwise return instance of AProtocol</returns>
public async Task <AProtocol> HandShakeClient(NetworkStream clientSocket)
{
HelloCommand hello = new HelloCommand(ClientConfig.SUPPORTED_PROTOCOLS);
await hello.SendAsync(clientSocket);
ACommand shouldBeOLLEH = GetCommand(await clientSocket.ReadLineAsync());
if (shouldBeOLLEH is OllehCommand)
{
OllehCommand olleh = (OllehCommand)shouldBeOLLEH;
AProtocol protocol = ClientConfig.PROTOCOL_FACTORY.GetProtocol(olleh.PROTOCOL);
if (protocol != null)
{
AckCommand ack = new AckCommand();
await ack.SendAsync(clientSocket);
return(protocol);
}
ErrorCommand error = new ErrorCommand($"Unsupported protocols '{olleh.PROTOCOL}'. Handshake failed.");
await error.SendAsync(clientSocket);
}
else
{
printIfErrorElseSendMessage(shouldBeOLLEH, "Handshake error. Expected OllehCommand but receive " + shouldBeOLLEH.GetType().Name, clientSocket);
}
return(null);
}
/// <summary>
/// Disconnect networkStream from server and send message.
/// </summary>
/// <param name="n"></param>
/// <param name="message"></param>
protected async void disconnect(NetworkStream n, string message)
{
lock (networkStreamPool) {
networkStreamPool.Remove(n);
}
await Task.Yield();
ErrorCommand error = new ErrorCommand(message);
await error.SendAsync(n);
n.Close();
}
