/// <summary>
/// reads a message from connection
/// </summary>
/// <param name="buffer">buffer where the message will be written</param>
/// <returns>true if we got a message, false if we got disconnected</returns>
public async UniTask <int> ReceiveAsync(MemoryStream buffer)
{
try
{
while (!_cancellationToken.IsCancellationRequested)
{
while (_queuedIncomingData.TryDequeue(out Message message))
{
Libuv2kNGLogger.Log(
$"Libuv2kConnection processing message: {BitConverter.ToString(message.Data)}");
buffer.SetLength(0);
buffer.Write(message.Data, 0, message.Data.Length);
return(message.Channel);
}
await UniTask.Delay(1);
}
throw new EndOfStreamException();
}
catch (EndOfStreamException)
{
throw new EndOfStreamException();
}
}
/// <summary>
/// Callback when connection has closed.
/// </summary>
/// <param name="handle">The stream handle in which closed connection to.</param>
private void OnLibuvClientClosed(TcpStream handle)
{
Libuv2kNGLogger.Log("libuv client callback: closed connection");
handle.Dispose();
// set client to null so we can't send to an old reference anymore
_client = null;
}
/// <summary>
/// Shut down the server.
/// </summary>
public void Shutdown()
{
if (_server != null)
{
_cancellationToken.Cancel();
_server?.Dispose();
_server = null;
Libuv2kNGLogger.Log("libuv server: TCP stopped!");
_serverLoop?.Dispose();
}
}
/// <summary>
/// Callback when connection receives a new message.
/// </summary>
/// <param name="handle">The stream handle we used to connect with server with.</param>
/// <param name="segment">The data that has come in with it.</param>
private void OnLibuvClientMessage(TcpStream handle, ArraySegment <byte> segment)
{
Libuv2kNGLogger.Log($"libuv client callback received: data= {BitConverter.ToString(segment.Array)}");
byte[] data = new byte[segment.Count];
Array.Copy(segment.Array, segment.Offset, data, 0, segment.Count);
_queuedIncomingData.Enqueue(new Message
{
Data = data
});
}
/// <summary>
/// Start listening for incoming connections.
/// </summary>
/// <param name="port">The port to bind to listen connections on.</param>
private void ListenAsync(int port)
{
// start server
IPEndPoint endPoint = new IPEndPoint(IPAddress.Any, port);
Libuv2kNGLogger.Log("libuv server: starting TCP..." + endPoint);
_server = new TcpStream(_serverLoop);
_server.SimultaneousAccepts(true);
_server.onServerConnect = OnLibuvServerConnected;
_server.Listen(endPoint);
Libuv2kNGLogger.Log("libuv server: TCP started!");
}
/// <summary>
/// Connect to server.
/// </summary>
/// <param name="uri">The server <see cref="Uri"/> to connect to.</param>
/// <returns>Returns back a new <see cref="Libuv2kConnection"/> when connected or null when failed.</returns>
public async UniTask <IConnection> ConnectAsync(Uri uri)
{
try
{
// libuv doesn't resolve host name, and it needs ipv4.
if (LibuvUtils.ResolveToIPV4(uri.Host, out IPAddress address))
{
// connect client
var localEndPoint = new IPEndPoint(IPAddress.Any, IPEndPoint.MinPort);
var remoteEndPoint = new IPEndPoint(address, uri.Port);
Libuv2kNGLogger.Log("Libuv client connecting to: " + address + ":" + uri.Port);
_client.onClientConnect = ConnectedAction;
_client.ConnectTo(localEndPoint, remoteEndPoint);
}
else
{
Libuv2kNGLogger.Log("Libuv client connect: no IPv4 found for hostname: " + uri.Host, LogType.Warning);
}
_connectedComplete = new UniTaskCompletionSource();
UniTask connectedCompleteTask = _connectedComplete.Task;
while (await UniTask.WhenAny(connectedCompleteTask,
UniTask.Delay(TimeSpan.FromSeconds(Math.Max(1, 30)))) != 0)
{
Disconnect();
return(null);
}
Libuv2kNGLogger.Log("Libuv client connected to: " + address + ":" + uri.Port);
return(this);
}
catch (Exception ex)
{
Libuv2kNGLogger.Log($"Error trying to attempting to connect. Error: {ex}", LogType.Error);
Disconnect();
}
return(null);
}
/// <summary>
/// Queue up connections that are trying to connect.
/// </summary>
/// <param name="handle">The stream which is trying to connect to server.</param>
/// <param name="error"></param>
private void OnLibuvServerConnected(TcpStream handle, Exception error)
{
Libuv2kNGLogger.Log("libuv server: client connected =" + handle.GetPeerEndPoint().Address);
// close if errors (AFTER setting up onClosed callback!)
if (error != null)
{
Libuv2kNGLogger.Log($"libuv server: client connection failed {error}");
handle.Dispose();
return;
}
var newClient = new Libuv2kConnection(true, handle);
_transport.Connected.Invoke(newClient);
}
/// <summary>
/// Receive call back when we finally connect to a server.
/// </summary>
/// <param name="handle">The stream handle we used to connect with server with.</param>
/// <param name="error">If there were any errors during connection.</param>
private void ConnectedAction(TcpStream handle, Exception error)
{
handle.onMessage = OnLibuvClientMessage;
handle.onError = OnLibuvClientError;
handle.onClosed = OnLibuvClientClosed;
// close if errors (AFTER setting up onClosed callback!)
if (error != null)
{
Libuv2kNGLogger.Log($"libuv client callback: client error {error}", LogType.Error);
handle.Dispose();
return;
}
_connectedComplete.TrySetResult();
}
/// <summary>
/// Disconnect this connection
/// </summary>
public void Disconnect()
{
Libuv2kNGLogger.Log("libuv client: closed connection");
_cancellationToken.Cancel();
_connectedComplete?.TrySetCanceled();
_client?.Dispose();
while (_queuedIncomingData.TryDequeue(out _))
{
// do nothing
}
while (_queueOutgoingData.TryDequeue(out _))
{
// do nothing
}
_clientLoop?.Dispose();
}
/// <summary>
/// Send data with channel specific settings. (NOOP atm until mirrorng links it)
/// </summary>
/// <param name="data">The data to be sent.</param>
/// <param name="channel">The channel to send it on.</param>
/// <returns></returns>
public void Send(ArraySegment <byte> data, int channel)
{
if (_client is null || _client.IsClosing || _cancellationToken.IsCancellationRequested)
{
return;
}
Libuv2kNGLogger.Log("Libuv2kConnection client: send data=" + BitConverter.ToString(data.Array));
byte[] buffer = new byte[data.Count];
Array.Copy(data.Array, data.Offset, buffer, 0, data.Count);
_queueOutgoingData.Enqueue(new Message
{
Data = buffer,
Channel = channel
});
return;
}
private UniTask ProcessOutgoingMessages()
{
while (!_cancellationToken.IsCancellationRequested)
{
for (int messageIndex = 0; messageIndex < _queueOutgoingData.Count; messageIndex++)
{
if (_queueOutgoingData.TryDequeue(out Message outgoing))
{
_client?.Send(new ArraySegment <byte>(outgoing.Data));
}
UniTask.Delay(1);
}
UniTask.Delay(1);
}
Libuv2kNGLogger.Log("Shutting down processing task");
return(UniTask.CompletedTask);
}
/// <summary>
/// We must tick through to receive connection status.
/// </summary>
private UniTask Tick()
{
// tick client
while (!(_clientLoop is null) && !(_client is null))
{
// Run with UV_RUN_NOWAIT returns 0 when nothing to do, but we
// should avoid deadlocks via LibuvMaxTicksPerFrame
for (int i = 0; i < LibuvMaxTicksPerFrame; ++i)
{
if (_clientLoop.Run(uv_run_mode.UV_RUN_NOWAIT) == 0)
{
Debug.Log("Client libuv ticked only " + i + " times");
break;
}
}
}
Libuv2kNGLogger.Log("Shutting down tick task.");
return(UniTask.CompletedTask);
}
/// <summary>
/// Callback for any errors that occur on the connection.
/// </summary>
/// <param name="handle">The stream handle we used to connect with server with.</param>
/// <param name="error">The error that occurred on the connection.</param>
private void OnLibuvClientError(TcpStream handle, Exception error)
{
Libuv2kNGLogger.Log($"libuv client callback: read error {error}", LogType.Error);
handle.Dispose();
}
