/// <summary>
/// Decides which operation is requested depending on prefix of the data string.
/// </summary>
/// <param name="aData">Full incoming data string</param>
/// <param name="aClient">Client that send the operation</param>
private static void DecideOperation(string aData, TcpServerClient aClient)
{
string lOperationData = String.Empty;
string lPrefix = GetDataPrefix(aData, out lOperationData);
switch (lPrefix)
{
case PREFIX_NEWRM:
CreateNewRoom(lOperationData, aClient);
break;
case PREFIX_SNDRM:
SendAvailableRooms(aClient);
break;
case PREFIX_CONRM:
ConnectToRoomAsSecondPlayer(lOperationData, aClient);
break;
case PREFIX_TDATA:
FillPlayerTurnData(lOperationData, aClient);
break;
default:
MessageBox.Show("Unknown data prefix.");
break;
//throw new Exception("Unknown data prefix.");
}
}
/// <summary>
/// Checks continuously if this client is sending new data.
/// Runs on a separate thread.
/// </summary>
/// <param name="aClient">Client to check for new data.</param>
private static async void CheckClientForNewData(TcpServerClient aClient)
{
NetworkStream lNetworkStream = aClient.PlayerClient.GetStream();
try
{
while (aClient.PlayerClient.Client.Connected)
{
int byteCount = await lNetworkStream.ReadAsync(_BufferSize, 0, _BufferSize.Length);
string ReceivedData = _EncodingInstance.GetString(_BufferSize, 0, byteCount);
if (ReceivedData != String.Empty)
{
DecideOperation(ReceivedData, aClient);
//Confirmation Message ?
//byte[] ResponseBytes = _EncodingInstance.GetBytes(MESSAGE_CONFIRMED);
//await lNetworkStream.WriteAsync(ResponseBytes, 0, ResponseBytes.Length);
}
Thread.Sleep(1);
}
}
catch (Exception e)
{
Console.WriteLine(">>> " + e.Message);
}
lNetworkStream.Close();
aClient.PlayerClient.Close();
_ListConnectedClients.Remove(aClient);
}
/// <summary>
/// Send player/client the current game state (was their move valid etc. and the board state)
/// </summary>
/// <param name="aRoom">Room</param>
/// <param name="aClient">Client the gets this data</param>
/// <param name="aGameStateString">Board state data</param>
private static void SendPlayerGameState(Room aRoom, TcpServerClient aClient, string aGameStateString)
{
DataGameState lGameState = new DataGameState();
lGameState.GameState = aGameStateString;
lGameState.PlayGround = aRoom.PlayGround;
SendData(aClient, String.Format("{0}{1}", PREFIX_GMEST, DataProcessor.SerializeGameStateData(lGameState)));
}
/// <summary>
/// Creates a new Play-Room.
/// </summary>
/// <param name="name">Name of the Room</param>
/// <param name="player1">Player 1</param>
public Room(string name, TcpServerClient player1)
{
this.Player1 = player1;
this.Name = name;
long ticks = DateTime.Now.Ticks;
this.Id = String.Format("{0}-{1}", ticks, Guid.NewGuid().ToString());
this.Status = RoomState.WAITING_FOR_SECOND_PLAYER;
}
/// <summary>
/// Finds the room where this client is in. Assuming each client is only in one room!!!
/// </summary>
/// <param name="aClient">Client to search for</param>
/// <returns>Room in which the client is</returns>
private static Room GetRoomFromClient(TcpServerClient aClient)
{
foreach (Room lRoom in _ListRooms)
{
if (lRoom.Player1.ClientID == aClient.ClientID || lRoom.Player2.ClientID == aClient.ClientID)
{
return(lRoom);
}
}
return(null);
}
/// <summary>
/// Continuously checks if a new client wants to connect to the server.
/// Runs on a separate thread.
/// </summary>
private static async void CheckForNewConnections()
{
TcpClient Client;
TcpServerClient ServerClient;
while (_TcpGameServer != null && CurrentServerStatus == ServerStatus.Online)
{
try
{
//Client connect with server
Client = await _TcpGameServer.AcceptTcpClientAsync();
ServerClient = new TcpServerClient();
ServerClient.PlayerClient = Client;
//Public Key für RSA verschicken
SendData(ServerClient, Cryptography.GetStringFromKey(Cryptography.PublicKey));
//Client verschlüsselt dann damit den symmetrischen Schlüssel und sendet Chiffre zurück
//Chiffre mit Private Key hier entschlüsseln
string lChiffre = WaitForResponse(ServerClient);
Cryptography.SymmetricKey = Cryptography.RsaDecrypt(lChiffre, Cryptography.PrivateKey);
//Sende BEREIT Nachricht an Client
SendData(ServerClient, MESSAGE_CONFIRMED);
//Client sendet Chiffre (AES) des Spielernamen (verschlüsselt durch symm. Schlüssel)
string lChiffre_ClientName = WaitForResponse(ServerClient);
//Chiffre wird hier mit symm. Schlüssel entschlüsselt
string lClientName = Cryptography.AesDecrypt(lChiffre_ClientName, Cryptography.SymmetricKey);
//Neuen Client anlegen (wird dann weiter unten gemacht)
//Client should immediately send message with client name / player name, gets saved as TcpServerClient
if (lClientName != String.Empty)
{
ServerClient.PlayerName = lClientName;
}
else
{
ServerClient.PlayerName = "Unknown Player";
}
//Add ServerClient to the list of clients
TryAddNewTcpClient(ServerClient);
Thread.Sleep(1);
}
catch
{
}
}
}
/// <summary>
/// Creates a new room, which then waits until a second player has joined.
/// </summary>
/// <param name="aData">Data required to creating a new room</param>
/// <param name="aClient">Client that creates the room</param>
private static void CreateNewRoom(string aData, TcpServerClient aClient)
{
DataRoom NewRoomData = DataProcessor.DeserializeRoomData(aData);
Room GameRoom = new Room(NewRoomData.Name, aClient);
_ListRooms.Add(GameRoom);
Thread ThreadWaitForSecPlayer = new Thread(() => WaitForSecondPlayer(GameRoom));
ThreadWaitForSecPlayer.Start();
}
private static string WaitForResponse(TcpServerClient aClient)
{
NetworkStream lNetworkStream = aClient.PlayerClient.GetStream();
string JSON_string = String.Empty;
while (JSON_string == String.Empty)
{
int byteCount = lNetworkStream.Read(_BufferSize, 0, _BufferSize.Length);
JSON_string = _EncodingInstance.GetString(_BufferSize, 0, byteCount);
Thread.Sleep(2);
}
return(JSON_string);
}
/// <summary>
/// Adds the second Player.
/// </summary>
/// <param name="player2">Player 2</param>
/// <returns>Returns true if execution was successful.</returns>
public bool AddSecondPlayer(TcpServerClient player2)
{
if (this.Status.Equals(RoomState.WAITING_FOR_SECOND_PLAYER) && this.Player2 == null)
{
this.Player2 = player2;
this.Status = RoomState.PLAYING;
this.ActivePlayer = this.Player1;
this.PlayGround = new int[NUMBER_OF_ROWS, NUMBER_OF_COLUMNS];
return(true);
}
else
{
return(false);
}
}
/// <summary>
/// Changes Player
/// </summary>
private void ChangePlayer()
{
if (this.ActivePlayer == this.Player1)
{
this.ActivePlayer = this.Player2;
}
else if (this.ActivePlayer == this.Player2)
{
this.ActivePlayer = this.Player1;
}
else
{
this.ActivePlayer = this.Player1;
Console.WriteLine("ERROR: Active Player is neither Player1 nor Player2!");
}
}
/// <summary>
/// Connects a client to a room as the second player.
/// </summary>
/// <param name="aOperationData">Json string for room ID</param>
/// <param name="aClient">Client to connect as second player</param>
private static void ConnectToRoomAsSecondPlayer(string aOperationData, TcpServerClient aClient)
{
RoomID ID = new RoomID(); //DataProcessor.DeserializeRoomID(aOperationData);
ID.ID = aOperationData;
GetRoomFromID(ID).AddSecondPlayer(aClient);
Thread.Sleep(5);
if (GetRoomFromID(ID).Status == Room.RoomState.PLAYING)
{
SendData(aClient, MESSAGE_CONFIRMED);
}
else
{
SendData(aClient, MESSAGE_ERROR);
}
}
/// <summary>
/// Executes a Turn from one Player.
/// </summary>
/// <param name="player">The executing Player</param>
/// <param name="column">The selected column</param>
/// <returns>Returns the state of the turn.</returns>
public TurnState NextTurn(TcpServerClient player, int column)
{
if (this.Status != RoomState.PLAYING)
{
Console.WriteLine("ERROR: Room is not fully initialized!");
return(TurnState.NOT_VALID);
}
if (player == this.ActivePlayer)
{
int playerNumber = this.GetCurrentPlayerNumber();
if (playerNumber == 0)
{
return(TurnState.UNDEFINIED_PLAYER);
}
TurnState turnState = this.DropPiece(playerNumber, column);
WinState winner = this.IsWinner();
if (winner == WinState.WINNER)
{
this.Status = RoomState.FINISHED;
turnState = TurnState.WINNER;
//return TurnState.WINNER;
}
else if (winner == WinState.DRAW)
{
this.Status = RoomState.FINISHED;
turnState = TurnState.DRAW;
}
if (turnState != TurnState.NOT_VALID)
{
this.ChangePlayer();
}
return(turnState);
}
else
{
return(TurnState.NOT_ACITVE_PLAYER);
}
}
/// <summary>
/// Trys to add ServerClient to list of clients. Only works successfully when client list does not contain client yet.
/// </summary>
/// <param name="aClient">Client to add to list.</param>
/// <returns>AddingSuccessful</returns>
private static bool TryAddNewTcpClient(TcpServerClient aClient)
{
bool canAdd = true;
foreach (TcpServerClient Client in _ListConnectedClients)
{
if (aClient.PlayerClient.Client.RemoteEndPoint == Client.PlayerClient.Client.RemoteEndPoint)
{
canAdd = false;
}
}
if (canAdd)
{
_ListConnectedClients.Add(aClient);
Thread lDataCheckThread = new Thread(() => CheckClientForNewData(aClient));
lDataCheckThread.Start();
return(true);
}
return(false);
}
/// <summary>
/// Send a client data.
/// </summary>
/// <param name="aClient">Client that gets the data</param>
/// <param name="aData">Data to send</param>
private static /*async*/ void SendData(TcpServerClient aClient, String aData)
{
try
{
if (aClient != null)
{
byte[] dataToSend = new byte[4096];
dataToSend = _EncodingInstance.GetBytes(aData);
aClient.PlayerClient.GetStream().BeginWrite(dataToSend, 0, dataToSend.Length, null, null);
//var byteCount = await aClient.PlayerClient.GetStream().ReadAsync(_BufferSize, 0, _BufferSize.Length);
//var response = _EncodingInstance.GetString(_BufferSize, 0, byteCount);
}
}
catch (SocketException e)
{
MessageBox.Show("Keine Verbindung möglich", "Error", MessageBoxButtons.OK, MessageBoxIcon.Warning);
}
catch (Exception e)
{
MessageBox.Show(e.Message);
}
}
/// <summary>
/// When clients the request a list of available rooms , they get the names and IDs (etc.) of those as a list.
/// Sends client a json string with this list.
/// </summary>
/// <param name="aClient">Client that requested rooms</param>
private static void SendAvailableRooms(TcpServerClient aClient)
{
bool DEBUG = false;
//Start DEBUG
if (DEBUG)
{
DataRoom room = new DataRoom();
room.Name = "TEST_ROOM";
TcpServerClient client = new TcpServerClient();
client.ClientID = "TEST_ID";
client.PlayerClient = new TcpClient();
client.PlayerName = "TEST_CLIENT";
CreateNewRoom(JsonConvert.SerializeObject(room), client);
}
//End DEBUG
DataSendRooms RoomData = new DataSendRooms(_ListRooms);
SendData(aClient, String.Format("{0}", DataProcessor.SerializeSendRoomsData(RoomData)));
}
/// <summary>
/// Fills the TurnData field in a room with the data received from a client.
/// Also adds clients ID to the field for later search.
/// </summary>
/// <param name="aOperationData">Json string data for game state</param>
/// <param name="aClient">Player client</param>
private static void FillPlayerTurnData(string aOperationData, TcpServerClient aClient)
{
GetRoomFromClient(aClient).TurnData = DataProcessor.DeserializePlayerTurnData(aOperationData, aClient.ClientID);
}
/// <summary>
/// Send the player a signal that it's their turn.
/// </summary>
/// <param name="aClient">Client that gets the signal</param>
private static void SendPlayerYourTurn(TcpServerClient aClient)
{
SendData(aClient, PREFIX_YOURT);
}
