public void ReceiveTcp(AsyncSocket.ReadResult rr)
{
Read(rr.Buffer);
}
public void RemoveTarget(AsyncSocket socket)
{
bool b;
_connectedClients.TryRemove(socket, out b);
PlayerEndPoint endPoint;
// perhaps add socket to PlayerEndPoint so we can always efficiently remove the player from _connectedClients
if (_playerEndPoints.TryRemove(socket.IpEndPoint, out endPoint))
{
Console.WriteLine($"Client: {socket.IpEndPoint.ToString().Replace("::ffff:", "")} disconnected.");
bool b2;
_udpEndPoints.TryRemove(endPoint.IpEndPoint, out b2);
Game game;
if (BoDService.PlayerIngame.TryRemove(endPoint.PlayerId, out game))
{
game.RemovePlayer(endPoint.PlayerId);
Console.WriteLine($"Player: {endPoint.PlayerId} quit game: {game.Id}.");
}
}
socket.Dispose();
}
private async Task AcceptClientAsync(Socket socket)
{
await Task.Yield();
AsyncSocket s = null;
try
{
s = new AsyncSocket(socket);
}
catch (SocketException)
{
socket.Dispose();
return;
}
_connectedClients.TryAdd(s, true);
Console.WriteLine($"Client connected: {s.IpEndPoint?.ToString().Replace("::ffff:", "")}");
try
{
while (true)
{
Task<AsyncSocket.ReadResult> receive = s.ReceiveAsync();
await receive;
ReceiveTcp(receive.Result);
}
}
catch (SocketException)
{
}
catch (ObjectDisposedException)
{
}
finally
{
RemoveTarget(s);
}
}
public void RemoveTarget(AsyncSocket socket)
{
LightEvent e;
_connectedClients.TryRemove(socket, out e);
PlayerEndPoint endPoint;
// perhaps add socket to PlayerEndPoint so we can always efficiently remove the player from _connectedClients
if (_playerEndPoints.TryRemove(socket.IpEndPoint, out endPoint))
{
BoDConsole.WriteLine($"Client: {socket.IpEndPoint.Address.MapToIPv4()}:{socket.IpEndPoint.Port} disconnected.");
// If any PlayerEndPoint, other than the one that was just removed,
// references PlayerId, the player must be connected on another PlayerEndPoint.
if (_playerEndPoints.Values.All(p => p.PlayerId != endPoint.PlayerId))
{
Game game;
if (BoDService.PlayerIngame.TryRemove(endPoint.PlayerId, out game))
{
game.RemovePlayer(endPoint.PlayerId);
}
}
}
socket.Dispose();
}
private async Task ReceiveFromClientAsync(AsyncSocket s)
{
while (true)
{
AsyncSocket.ReadResult result = await s.ReceiveAsync();
LightEvent e;
if (_connectedClients.TryGetValue(s, out e))
{
// Reset the LightEvent's timer to prevent timeout.
e.Reset();
}
Read(result.Buffer, s.IpEndPoint);
}
}
/// <summary>
/// Awaits a message from the client containing a sessionId.
/// If the sessionId matches any we have given out. Assign the found PlayerEndPoint
/// to the client. We write back the sessionId again as a signal that the client should
/// begin attempting to "connect" with UDP.
/// </summary>
/// <param name="socket"> The TCP socket for the client. </param>
/// <returns> true if the client succesfully verified through TCP. false otherwise. </returns>
private async Task<bool> AddTCPTarget(AsyncSocket socket)
{
AsyncSocket.ReadResult result = await socket.ReceiveAsync();
if (result.BytesRead != SESSIONID_LENGTH)
{
return false;
}
string sessionId = Convert.ToBase64String(result.Buffer);
PlayerEndPoint playerEndPoint;
if (!_playerSessionTokens.TryGetValue(sessionId, out playerEndPoint))
{
return false;
}
if (sessionId != playerEndPoint.SessionId)
return false;
playerEndPoint.TCPSocket = socket;
await socket.SendMessage(result.Buffer);
return _playerEndPoints.TryAdd(socket.IpEndPoint, playerEndPoint);
}
private async Task AcceptClientAsync(Socket socket)
{
await Task.Yield();
AsyncSocket s = null;
try
{
s = new AsyncSocket(socket);
}
catch (SocketException)
{
socket.Dispose();
return;
}
// Cancel the attempt to communicate with the client on both TCP and UDP after 10 sec.
CancellationTokenSource cts = new CancellationTokenSource(TCP_TIMEOUT);
Task timeout = new Task(async () =>
{
await Task.Delay(TCP_TIMEOUT);
throw new SocketException();
});
try
{
Task<bool> tcp = AddTCPTarget(s);
// Only await timeout once. If tcp finishes first we wont get an exception when timeout finishes.
await Task.WhenAny(tcp, timeout);
// await tcp here aswell because we want the result of it. Once we got the result of AddTCPTarget(),
// we await the result of AddUDPTarget.
PlayerEndPoint playerEndPoint;
if (await tcp && _playerEndPoints.TryGetValue(s.IpEndPoint, out playerEndPoint) && await AddUDPTarget(playerEndPoint, cts.Token))
{
// Timeout the TCP and UDP connection to a client if we dont receive a TCP message
// at least once per 10 sec.
_connectedClients.TryAdd(s, new LightEvent(TCP_TIMEOUT, () => { RemoveTarget(s); }));
playerEndPoint.InactivityEvent = new LightEvent(60000, () => { RemoveTarget(s); });
BoDConsole.WriteLine($"Client connected: {s.IpEndPoint.Address.MapToIPv4()}");
// Start reading actual game related messages from the client.
await ReceiveFromClientAsync(s);
}
}
catch (SocketException)
{
}
catch (ObjectDisposedException)
{
}
finally
{
cts.Dispose();
RemoveTarget(s);
}
}
private async Task AcceptClientAsync(Socket socket)
{
await Task.Yield();
AsyncSocket s = null;
try
{
s = new AsyncSocket(socket);
_connectedClients.TryAdd(s, true);
Console.WriteLine($"Client connected: {s.IpEndPoint?.ToString().Replace("::ffff:", "")}");
while (true)
{
Task<AsyncSocket.ReadResult> receive = s.ReceiveAsync();
await receive;
ReceiveTcp(receive.Result);
}
}
catch (SocketException)
{
}
finally
{
if (s != null)
{
bool b;
if (_connectedClients.TryRemove(s, out b))
{
IPEndPoint ip = s.IpEndPoint;
if (ip != null)
{
Console.WriteLine($"Client: {ip.ToString().Replace("::ffff:", "")} disconnected.");
RemoveTarget(ip);
}
}
s.Dispose();
}
socket?.Close();
}
}
