public InitializationResponse ConnectToServer()
{
client.Connect(server_endpoint);
this.private_endpoint = ((IPEndPoint)client.LocalEndPoint).Convert();
System.Console.WriteLine($"{client.LocalEndPoint}");
System.Console.WriteLine($"Local endpoint: {private_endpoint.GetAddress()}:{private_endpoint.Port}");
this.state = Tcp_State.Initialization;
this.stream = new NetworkStream(client);
InitializationRequest info = new InitializationRequest
{
ClientId = id,
PrivateEndpoint = private_endpoint
};
info.WriteDelimitedTo(stream);
var response = InitializationResponse.Parser.ParseDelimitedFrom(stream);
this.state = Tcp_State.WithoutLobby;
return(response);
}
public PeerWithinLobbyResponse ReceiveWithinLobbyPeerRequest()
{
// same spiel as above goes for here as well
if (!TryGetMessageOrStateChange(out PeerWithinLobbyRequest request))
{
return(null);
}
switch (request.MessageCase)
{
case PeerWithinLobbyRequest.MessageOneofCase.LeaveLobbyRequest:
{
LeaveLobby();
state = Tcp_State.WithoutLobby;
var response = new LeaveLobbyResponse();
response.Success = true;
return(new PeerWithinLobbyResponse
{
LeaveLobbyResponse = response
});
}
default:
Log($"Unexpected within lobby request message.");
return(null);
}
}
public bool TryJoinLobby(int id, string password)
{
var request = new WithoutLobbyRequest();
var message = new JoinLobbyRequest();
message.Password = password;
message.LobbyId = id;
request.JoinLobbyRequest = message;
System.Console.WriteLine($"Joining lobby {id}");
request.WriteDelimitedTo(stream);
var response = JoinLobbyResponse.Parser.ParseDelimitedFrom(stream);
if (response.LobbyInfo != null)
{
System.Console.WriteLine($"Successfully joined lobby: {response.LobbyInfo}");
this.state = Tcp_State.PeerWithinLobby;
this.joined_lobby = response.LobbyInfo;
return(true);
}
this.state = Tcp_State.WithoutLobby;
return(false);
}
public Client(IPEndPoint server_endpoint)
{
this.server_endpoint = server_endpoint;
this.client = CreateSocket();
this.id = new Random().Next();
this.state = Tcp_State.Connecting;
}
public bool TryCreateLobby(string password)
{
var request = new WithoutLobbyRequest();
var message = new CreateLobbyRequest();
message.Password = password;
message.Capacity = 2;
request.CreateLobbyRequest = message;
System.Console.WriteLine($"Creating lobby {id}");
request.WriteDelimitedTo(stream);
var response = CreateLobbyResponse.Parser.ParseDelimitedFrom(stream);
if (response.LobbyId != 0)
{
System.Console.WriteLine($"Successfully created lobby {response.LobbyId}");
this.state = Tcp_State.HostWithinLobby;
this.joined_lobby = new LobbyInfo
{
HostId = id,
LobbyId = response.LobbyId,
Capacity = message.Capacity
};
return(true);
}
this.state = Tcp_State.WithoutLobby;
return(false);
}
public void Start()
{
try
{
Initialize();
server.sessions.Add(id, this);
state = Tcp_State.WithoutLobby;
while (state != Tcp_State.Closed && client.Connected)
{
switch (state)
{
case Tcp_State.WithoutLobby:
ReceiveMessageAndRespond(ReceiveWithoutLobbyRequest);
break;
case Tcp_State.PeerWithinLobby:
ReceiveMessageAndRespond(ReceiveWithinLobbyPeerRequest);
break;
case Tcp_State.HostWithinLobby:
ReceiveMessageAndRespond(ReceiveWithinLobbyHostRequest);
break;
case Tcp_State.Closing:
// for now, just end the session
Log("Closing session in 10 seconds, since lobby has been locked.");
Thread.Sleep(10 * 1000);
state = Tcp_State.Closed;
break;
}
}
Log($"Ending session.");
}
catch (System.Exception e)
{
Log($"Session prematurely ended due to the exception: {e}");
}
server.sessions.Remove(id);
if (joined_lobby != null)
{
LeaveLobby();
foreach (var lobby in server.lobbies.Values)
{
server.Log(lobby.GetInfo().ToString());
}
}
if (client.Connected)
{
client.Close();
}
}
public void ListenHost()
{
var response = ReceiveMessage <HostWithinLobbyResponse>();
switch (response.MessageCase)
{
case HostWithinLobbyResponse.MessageOneofCase.PeerJoinedNotification:
System.Console.WriteLine("Peer joined");
AddPeerToLobby(response.PeerJoinedNotification);
break;
case MakeHostResponse:
System.Console.WriteLine("Made smb host");
break;
case HostWithinLobbyResponse.MessageOneofCase.LeaveLobbyResponse:
System.Console.WriteLine("Leave lobby response");
break;
case GoResponse:
if (response.GoResponse.PeerAddressInfo.Count > 0)
{
var tasks = new Task <Socket> [response.GoResponse.PeerAddressInfo.Count];
for (int i = 0; i < tasks.Length; i++)
{
var info = response.GoResponse.PeerAddressInfo[i];
tasks[i] = Task.Run(() => EstablishOutboundTcp(info));
System.Console.WriteLine(info.ToPrettyString());
}
Task.WaitAll(tasks);
for (int i = 0; i < tasks.Length; i++)
{
System.Console.WriteLine($"{i}: Connection established? {tasks[i].Result != null}");
}
}
ConnectedToPeerEvent?.Invoke();
state = Tcp_State.Closing;
break;
default:
System.Console.WriteLine("Unexpected response/notification");
break;
}
}
public void StartReceiving()
{
while (state != Tcp_State.Closed && client.Connected)
{
switch (state)
{
case Tcp_State.PeerWithinLobby:
ListenPeer();
break;
case Tcp_State.HostWithinLobby:
ListenHost();
break;
case Tcp_State.Closing:
System.Console.WriteLine("Closing");
state = Tcp_State.Closed;
break;
}
}
}
public void ListenPeer()
{
var response = ReceiveMessage <PeerWithinLobbyResponse>();
switch (response.MessageCase)
{
case PeerWithinLobbyResponse.MessageOneofCase.PeerJoinedNotification:
AddPeerToLobby(response.PeerJoinedNotification);
System.Console.WriteLine("Peer joined");
break;
case LeaveLobbyNotification:
System.Console.WriteLine("Leave lobby notification");
break;
case BecomeHostNotification:
System.Console.WriteLine("Promoted to host");
break;
case PeerWithinLobbyResponse.MessageOneofCase.LeaveLobbyResponse:
System.Console.WriteLine("Leave lobby response");
break;
case HostAddressInfo:
{
var info = response.HostAddressInfo;
System.Console.WriteLine(info.ToPrettyString());
var task = Task.Run(() => EstablishOutboundTcp(response.HostAddressInfo));
Task.WaitAll(task);
System.Console.WriteLine($"Connection to host established? {task.Result != null}");
state = Tcp_State.Closing;
ConnectedToPeerEvent?.Invoke();
break;
}
default:
System.Console.WriteLine("Unexpected response/notification");
break;
}
}
public HostWithinLobbyResponse ReceiveWithinLobbyHostRequest()
{
// same spiel as above goes for here as well
if (!TryGetMessageOrStateChange(out HostWithinLobbyRequest request))
{
return(null);
}
var outerResponse = new HostWithinLobbyResponse();
switch (request.MessageCase)
{
case HostWithinLobbyRequest.MessageOneofCase.LeaveLobbyRequest:
{
LeaveLobby();
var response = new LeaveLobbyResponse();
response.Success = true;
state = Tcp_State.WithoutLobby;
return(new HostWithinLobbyResponse
{
LeaveLobbyResponse = response
});
}
case MakeHostRequest:
{
var response = new MakeHostResponse();
int peer_id = request.MakeHostRequest.PeerId;
if (id != peer_id && // since we are host
joined_lobby.peers.ContainsKey(peer_id))
{
response.NewHostId = peer_id;
MakeHost(joined_lobby.peers[peer_id]);
}
return(new HostWithinLobbyResponse
{
MakeHostResponse = response
});
}
case GoRequest:
{
var host_response = new GoResponse();
var host_address_message = CreateAddressMessage();
var peer_notification = new PeerWithinLobbyResponse
{
HostAddressInfo = host_address_message
};
// TODO: run concurrently (although sending is pretty fast, I suppose)
foreach (var peer_id in joined_lobby.GetNonHostPeerIds())
{
var peer = joined_lobby.peers[peer_id];
try
{
peer.joined_lobby = null;
peer.TransitionState(Tcp_State.Closing);
peer_notification.WriteDelimitedTo(peer.stream);
host_response.PeerAddressInfo.Add(peer.CreateAddressMessage());
}
catch
{
peer.Log($"An error has been catched while trying to send PeerAddressInfo");
}
}
server.lobbies.Remove(joined_lobby.id);
joined_lobby = null;
state = Tcp_State.Closing;
return(new HostWithinLobbyResponse
{
GoResponse = host_response
});
}
default:
Log($"Unexpected within lobby request message.");
return(null);
}
}
public Tcp_Session(Socket client, Server server)
{
this.client = client;
this.state = Tcp_State.Connecting;
this.server = server;
}
public IMessage ReceiveWithoutLobbyRequest()
{
// so, this happens in 2 cases:
// 1. either a state has been changed, which would rerun the loop condition and
// it would exit into the main loop;
// 2. or it were not, in which case the reading of stream failed.
// Either invalid data has been received or the client has diconnected.
// This is also checked in the while conditon.
// UDPATE: the client.Connected property does not reflect the fact whether the
// client is connected. However, the stream does get closed when the connection dies down.
if (!TryGetMessageOrStateChange(out WithoutLobbyRequest request))
{
return(null);
}
switch (request.MessageCase)
{
// TODO: do stuff with the password
case CreateLobbyRequest:
{
Log("Creating a new lobby...");
CreateLobbyResponse response = new CreateLobbyResponse();
if (server.TryCreateLobby(id, out Lobby lobby) && lobby.TryJoin(this))
{
Log($"Creating a new lobby {lobby.id}");
joined_lobby = lobby;
response.LobbyId = lobby.id;
state = Tcp_State.HostWithinLobby;
}
return(response);
}
case JoinLobbyRequest:
{
Log($"Joining lobby {request.JoinLobbyRequest.LobbyId}...");
JoinLobbyResponse response = new JoinLobbyResponse();
if (server.lobbies.TryGetValue(request.JoinLobbyRequest.LobbyId, out Lobby lobby) &&
lobby.TryJoin(this))
{
Log($"Joined lobby {request.JoinLobbyRequest.LobbyId}.");
joined_lobby = lobby;
response.LobbyInfo = lobby.GetInfo();
state = Tcp_State.PeerWithinLobby;
// notify other peers
var peer_joined_notification = new PeerJoinedNotification();
peer_joined_notification.PeerId = id;
foreach (var peer_id in lobby.peers.Keys)
{
if (peer_id != id)
{
lobby.peers[peer_id].SendPeerJoinedNotification(peer_joined_notification);
}
}
}
return(response);
}
case MyAddressInfoRequest:
{
Log($"Sending address info message.");
return(CreateAddressMessage());
}
default:
Log($"Unexpected WithoutLobby request message. {request}");
return(null);
}
}
/*
* This method is useful when changing the state of some other session from without
* its thread, so e.g. if thread of session with id = 1 transitions thread with id = 2
* into another state.
*
* This potentially might be dangerous to do while the other thread is in the process
* of receiving messages, which is why:
* a. the listen task gets cancelled to not misinterpret the message.
* b. if in the middle of parsing, the message and the buffered data is all discarded.
*
* An ideal solution would be to finish parsing, if in the middle of parsing, but then discard
* the message, however, I have no way of knowing that information, since I'm using protobuf for packets.
*/
public void TransitionState(Tcp_State state)
{
this.state = state;
this.change_state_task_completion_source.SetResult(state);
}