/// <summary>
/// Call with a received message. If this message is not the current state's
/// ValidReceives list, the connection will be disconnected.
/// </summary>
/// <param name="message">A received message</param>
public void Received(IMessage message)
{
if (!_state.ValidReceives.Contains(message.TypeId))
{
_disconnecter.Disconnect();
return;
}
_state.Received(this, message);
}
public void Sent(NetworkStateContext context, IMessage message)
{
// The only valid send is FoundGame
context.SetState(NetworkStateId.FoundGame);
// Get the opponents connection.
if (!_userRepo.TryGetSender(_state.Match.Opponent.Username, out var opponent))
{
// Somehow the opponent is not logged in.
_disconnecter.Disconnect();
return;
}
_state.SetMatchTimeoutCallback((s, e) =>
{
// If the opponent has responded already, send a RejectGame to them.
if (_state.Match.Opponent.AcceptedGame != MatchResponse.None)
{
opponent.Send(new BasicMessage(MessageTypeId.RejectGame));
}
_sender.Send(new BasicMessage(MessageTypeId.GameExpired));
});
_state.StartMatchTimer();
}
public void Received(NetworkStateContext context, IMessage message)
{
// Only valid receive is MyGuess
context.SetState(NetworkStateId.Waiting);
var guess = ((MyGuessMessage)message).Position;
var guessResult = _state.Match.Opponent.Board.Guess(guess);
var id = guessResult switch
{
GuessResult.Miss => MessageTypeId.Miss,
GuessResult.Hit => MessageTypeId.Hit,
GuessResult.Sunk => MessageTypeId.Sunk,
GuessResult.Win => MessageTypeId.YouWin,
_ => throw new ArgumentOutOfRangeException()
};
_sender.Send(new BasicMessage(id));
// Get the opponents connection.
if (!_userRepo.TryGetSender(_state.Match.Opponent.Username, out var opponent))
{
// Somehow the opponent is not logged in.
_disconnecter.Disconnect();
return;
}
if (id == MessageTypeId.YouWin)
{
opponent.Send(new YouLoseMessage(guess));
return;
}
opponent.Send(new TheirGuessMessage(guess));
}
/// <summary>
/// Asynchronously receive and parse data terminating if anything unexpected
/// is received.
/// </summary>
public async Task StartReceivingAsync()
{
var reader = PipeReader.Create(_stream);
_logger.LogInfo("Connected to " + _socket.RemoteEndPoint);
while (true)
{
// Suspend this method until reader returns data.
var result = await reader.ReadAsync();
// Parse contents until we run out of valid & complete messages.
var position = _parser.Parse(result.Buffer);
// Disconnect if we receive any invalid data.
if (position == null)
{
break;
}
// Tell the reader how much data we evaluated so it does not return
// data we have already seen.
reader.AdvanceTo(position.Value, result.Buffer.End);
}
await reader.CompleteAsync();
_disconnecter.Disconnect();
}
public void Received(NetworkStateContext context, IMessage message)
{
// Get the opponents connection.
if (!_userRepo.TryGetSender(_state.Match.Opponent.Username, out var opponent))
{
// Somehow the opponent is not logged in.
_disconnecter.Disconnect();
return;
}
_state.CancelMatchTimer();
// The player is rejecting the game.
if (message.TypeId == MessageTypeId.RejectGame)
{
// Mark the player as accepting the game.
_state.Match.Player.AcceptedGame = MatchResponse.Reject;
// Update our state.
context.SetState(NetworkStateId.WaitingForBoard);
// Let the opponent know that the player has rejected the game.
opponent.Send(new BasicMessage(MessageTypeId.RejectGame));
return;
}
// The only remaining valid message is AcceptGame. So mark the player as accept.
_state.Match.Player.AcceptedGame = MatchResponse.Accept;
// If the opponent has also sent AcceptGame, we let both know to start the game.
if (_state.Match.Opponent.AcceptedGame == MatchResponse.Accept)
{
// Let both know that the game has been accepted.
_sender.Send(new BasicMessage(MessageTypeId.AcceptGame));
opponent.Send(new BasicMessage(MessageTypeId.AcceptGame));
// Notify who goes first
if (_state.Match.PlayerGoesFirst)
{
_sender.Send(new BasicMessage(MessageTypeId.AssignRed));
opponent.Send(new BasicMessage(MessageTypeId.AssignBlue));
}
else
{
_sender.Send(new BasicMessage(MessageTypeId.AssignBlue));
opponent.Send(new BasicMessage(MessageTypeId.AssignRed));
}
}
}