/// <summary>
/// Callback to <code>TcpClient.BeginReceive</code>. If we are accepting connections (<see cref="AcceptingConnections"/>),
/// and the sender is <see cref="InviteStatus.None"/>, their invite is registered
/// </summary>
private void AcceptConnection(IAsyncResult result)
{
TcpClient client = _listener.EndAcceptTcpClient(result);
_listener.BeginAcceptTcpClient(AcceptConnection, null);
IPEndPoint player = (IPEndPoint)client.Client.RemoteEndPoint;
var wrapper = new TcpWrapper <GameInitializationPacket>(client);
if (!AcceptingConnections)
{
Program.Log(this).Warning("TcpListener recieved connection while not AcceptingConnections");
wrapper.Send(new GameInitializationPacket(InitRequest.Reject));
wrapper.Dispose();
return;
}
// can only accept invitations from remotes with no preexisting invites
if (!_connections.ContainsKey(player) || _connections[player].Item1 == InviteStatus.None)
{
_connections[player] = Tuple.Create(InviteStatus.SentByRemote, wrapper);
// If a withdrawal is received
wrapper.ReceiveEvent += () =>
{
wrapper.Dispose();
_connections[player] = NewEmptyConnection();
};
}
else
{
Program.Log(this).Warning("TcpListener received invalid request");
}
}
internal void SendInvitationTo(IPEndPoint player)
{
if (_connections[player].Item1 != InviteStatus.None)
{
throw new ArgumentException("Passed player must not be invited/have invited us");
}
TcpClient client = new TcpClient();
client.Connect(player);
var wrapper = new TcpWrapper <GameInitializationPacket>(client);
wrapper.ReceiveEvent += () =>
{
while (wrapper.Received.Any())
{
GameInitializationPacket packet;
wrapper.Received.TryDequeue(out packet);
switch (packet.Request)
{
case InitRequest.Accept:
JoinGameWith(player);
break;
case InitRequest.Reject:
wrapper.Dispose();
_connections[player] = NewEmptyConnection();
break;
}
}
};
_connections[player] = Tuple.Create(InviteStatus.SentByUs, wrapper);
}
/// <summary>
/// Helper function for withdrawing and rejecting, i.e. when something is sent to a player before closing the connection
/// </summary>
private void SendAndClose(IPEndPoint player, InviteStatus expectedStatus, InitRequest request)
{
if (expectedStatus == InviteStatus.SentByUs && _connections[player].Item1 != InviteStatus.SentByUs)
{
throw new ArgumentException("Passed player must already be invited");
}
if (expectedStatus == InviteStatus.SentByRemote && _connections[player].Item1 != InviteStatus.SentByRemote)
{
throw new ArgumentException("Passed player must already have sent an invitation");
}
TcpWrapper <GameInitializationPacket> wrapper = _connections[player].Item2;
wrapper.Send(new GameInitializationPacket(request));
wrapper.Dispose();
_connections[player] = NewEmptyConnection();
}