static void AcceptCallback(IAsyncResult ar)
{
Socket serverSocket = (Socket)ar.AsyncState;
Socket clientSocket = serverSocket.EndAccept(ar);
WriteConsole("Accepted connection.");
BeginReceive(clientSocket);
BeginAccept(serverSocket);
string clientName = GetUniqueName();
ClientInformation clientInformation = new ClientInformation(clientSocket, clientName, GetFirstUnusedClientId());
string connectionResponse = XMLManager.Serialize(new ConnectionResponse(clientName, _clients.Select(c => c.Name).ToList()));
BeginSend(clientInformation, connectionResponse);
string clientConnect = XMLManager.Serialize(new ClientConnect(clientName));
foreach (ClientInformation client in _clients)
{
BeginSend(client, clientConnect);
}
_clients.Add(clientInformation);
}
static void BeginSend(ClientInformation clientSocket, string text)
{
byte[] dataToSend = Encoding.UTF8.GetBytes(text);
clientSocket.Socket.BeginSend(dataToSend, 0, dataToSend.Length, SocketFlags.None, new AsyncCallback(SendCallback), clientSocket.Socket);
WriteConsole(string.Format("Sending data to client {0}: {1}", clientSocket.Name, text));
}
static void ReceiveCallBack(IAsyncResult ar)
{
StateObject state = (StateObject)ar.AsyncState;
Socket clientSocket = state.Socket;
int bytesRead = clientSocket.EndReceive(ar);
string text = Encoding.UTF8.GetString(state.Buffer, 0, bytesRead);
ClientInformation senderClient = GetClientInformation(clientSocket);
WriteConsole(string.Format("Received data from client {0}: {1}", senderClient.Name, text));
if (!string.IsNullOrEmpty(text))
{
object element = XMLManager.Deserialize(text);
if (element is SendMessage sendMessage)
{
BroadcastMessage broadcastMessage = new BroadcastMessage(senderClient.Name, sendMessage.Text);
string broadcastMessageText = XMLManager.Serialize(broadcastMessage);
foreach (ClientInformation client in _clients)
{
BeginSend(client, broadcastMessageText);
}
}
else if (element is ChangeNameRequest cnr)
{
if (string.IsNullOrEmpty(cnr.Name))
{
BeginSend(senderClient, XMLManager.Serialize(new ErrorResponse((int)ErrorCode.InvalidName)));
}
else if (IsNameUnique(cnr.Name))
{
string changeNameResponseText = XMLManager.Serialize(new ChangeNameResponse(senderClient.Name, cnr.Name));
foreach (ClientInformation client in _clients)
{
BeginSend(client, changeNameResponseText);
}
senderClient.Name = cnr.Name;
}
else
{
BeginSend(senderClient, XMLManager.Serialize(new ErrorResponse((int)ErrorCode.NameAlreadyExists)));
}
}
else if (element is ChallengeRequest challengeRequest)
{
ClientInformation challengeeClient = GetClientInformation(challengeRequest.ChallengeeName);
if (challengeeClient.State == ClientState.Available)
{
senderClient.ChangeStateToChallenge(challengeeClient.Id);
challengeeClient.ChangeStateToChallenge(senderClient.Id);
BeginSend(senderClient, XMLManager.Serialize(new ChallengePendingResponse()
{
ChallengeeName = challengeRequest.ChallengeeName
}));
BeginSend(challengeeClient, XMLManager.Serialize(new ChallengeRequest(senderClient.Name)));
}
else if (challengeeClient.State == ClientState.Challenge)
{
BeginSend(senderClient, XMLManager.Serialize(new ErrorResponse((int)ErrorCode.ClientAlreadyChallenged)));
}
else if (challengeeClient.State == ClientState.Duel)
{
BeginSend(senderClient, XMLManager.Serialize(new ErrorResponse((int)ErrorCode.ClientAlreadyInDuel)));
}
else
{
throw new InvalidOperationException("Unknown client state.");
}
}
else if (element is CancelChallengeRequest)
{
ClientInformation challengeeClient = GetClientInformation(senderClient.OtherClientId);
senderClient.ChangeStateToAvailable();
challengeeClient.ChangeStateToAvailable();
BeginSend(senderClient, XMLManager.Serialize(new CancelChallengeRequest()));
BeginSend(challengeeClient, XMLManager.Serialize(new CancelChallengeResponse()
{
Challenger = senderClient.Name
}));
}
else if (element is DeclineChallengeRequest)
{
ClientInformation challengerClient = GetClientInformation(senderClient.OtherClientId);
senderClient.ChangeStateToAvailable();
challengerClient.ChangeStateToAvailable();
BeginSend(senderClient, XMLManager.Serialize(new DeclineChallengeRequest()));
BeginSend(challengerClient, XMLManager.Serialize(new DeclineChallengeResponse()
{
Challengee = senderClient.Name
}));
}
else if (element is AcceptChallengeRequest)
{
//TODO: implement properly
ClientInformation challengerClient = GetClientInformation(senderClient.OtherClientId);
senderClient.ChangeStateToAvailable();
challengerClient.ChangeStateToAvailable();
BeginSend(senderClient, XMLManager.Serialize(new AcceptChallengeRequest()));
BeginSend(challengerClient, XMLManager.Serialize(new AcceptChallengeResponse()
{
Challengee = senderClient.Name
}));
}
else
{
throw new ArgumentOutOfRangeException("element");
}
BeginReceive(clientSocket);
}
else
{
senderClient.Socket.Shutdown(SocketShutdown.Both);
senderClient.Socket.Close();
_clients.Remove(senderClient);
WriteConsole(string.Format("{0} disconnected.", senderClient.Name));
ClientDisconnect clientDisconnect = new ClientDisconnect(senderClient.Name);
string clientDisconnectText = XMLManager.Serialize(clientDisconnect);
foreach (ClientInformation client in _clients)
{
BeginSend(client, clientDisconnectText);
}
}
}