/// <summary>
/// Processes the payload and invokes the <see cref="LavalinkSocket.PayloadReceived"/>
/// event asynchronously. (Can be override for event catching)
/// </summary>
/// <param name="eventArgs">the event arguments</param>
/// <returns>a task that represents the asynchronous operation</returns>
protected override async Task OnPayloadReceived(PayloadReceivedEventArgs eventArgs)
{
var payload = eventArgs.Payload;
// received an event
if (payload is EventPayload eventPayload)
{
await OnEventReceived(eventPayload);
}
// received a payload for a player
if (payload is IPlayerPayload playerPayload)
{
await OnPlayerPayloadReceived(playerPayload);
}
// statistics update received
if (payload is StatsUpdatePayload statsUpdate)
{
Statistics = new NodeStatistics(statsUpdate.Players, statsUpdate.PlayingPlayers,
statsUpdate.Uptime, statsUpdate.Memory, statsUpdate.Processor, statsUpdate.FrameStatistics);
await OnStatisticsUpdateAsync(new NodeStatisticsUpdateEventArgs(Statistics));
}
await base.OnPayloadReceived(eventArgs);
}
private void OnReceived(object sender, PayloadReceivedEventArgs args)
{
// TODO KZ: handle missing packets
var packet = (Packet)args.Payload;
if (packet.Total == 1)
{
Received?.Invoke(this, new MessageReceivedEventArgs(packet.Sender, packet.Total, packet.Message, args.Received, args.Received));
return;
}
var key = new MessageKey(packet.Sender, packet.Sequence, packet.Total);
var receivedContext = _receivedContexts.GetValueOrAdd(key, _ => new ReceivedContext(packet.Total));
receivedContext.Chunks.Add(packet.Message);
if (receivedContext.Chunks.Count == 1)
{
receivedContext.FirstSent = args.Received;
return;
}
if (receivedContext.Chunks.Count != packet.Total)
{
return;
}
Received?.Invoke(this, new MessageReceivedEventArgs(packet.Sender, packet.Total, receivedContext.Chunks.Concat(), receivedContext.FirstSent, args.Received));
_receivedContexts.Remove(key);
}
/// <summary>
/// Processes an incoming payload asynchronously.
/// </summary>
/// <remarks>
/// This method should not be called manually. It is called in the connection life cycle,
/// see: <see cref="RunLifeCycleAsync"/>.
/// </remarks>
/// <returns>a task that represents the asynchronous operation</returns>
/// <exception cref="ObjectDisposedException">thrown if the instance is disposed</exception>
private async Task ProcessNextPayload()
{
EnsureNotDisposed();
WebSocketReceiveResult result;
try
{
result = await _webSocket !.ReceiveAsync(new ArraySegment <byte>(_receiveBuffer, 0, _receiveBuffer.Length), _cancellationTokenSource !.Token);
}
catch (WebSocketException ex)
{
if (_cancellationTokenSource !.IsCancellationRequested)
{
return;
}
Logger?.Log(ex, "Lavalink Node disconnected (without handshake, maybe connection loss or server crash)");
await OnDisconnectedAsync(new DisconnectedEventArgs(_webSocketUri, WebSocketCloseStatus.Empty, string.Empty, true));
_webSocket?.Dispose();
_webSocket = null;
return;
}
// check if the web socket received a close frame
if (result.MessageType == WebSocketMessageType.Close)
{
Logger?.Log(this, string.Format("Lavalink Node disconnected: {0}, {1}.", result.CloseStatus.GetValueOrDefault(), result.CloseStatusDescription), LogLevel.Warning);
await OnDisconnectedAsync(new DisconnectedEventArgs(_webSocketUri, result.CloseStatus.GetValueOrDefault(), result.CloseStatusDescription, true));
_webSocket.Dispose();
_webSocket = null;
return;
}
var content = Encoding.UTF8.GetString(_receiveBuffer, 0, result.Count);
if (!result.EndOfMessage)
{
// the server sent a message frame that is incomplete
_overflowBuffer.Append(content);
return;
}
// check if old data exists
if (result.EndOfMessage && _overflowBuffer.Length > 0)
{
_overflowBuffer.Append(content);
content = _overflowBuffer.ToString();
_overflowBuffer.Clear();
}
if (_ioDebug)
{
Logger?.Log(this, string.Format("Received payload: `{0}` from: {1}.", content, _webSocketUri), LogLevel.Trace);
}
// process data
try
{
var payload = PayloadConverter.ReadPayload(content);
var eventArgs = new PayloadReceivedEventArgs(payload, content);
await OnPayloadReceived(eventArgs);
}
catch (Exception ex)
{
Logger?.Log(this, string.Format("Received bad payload: {0}.", content), LogLevel.Warning, ex);
await CloseAsync(WebSocketCloseStatus.InvalidPayloadData);
}
}
/// <summary> /// Invokes the <see cref="PayloadReceived"/> event asynchronously. (Can be override for /// event catching) /// </summary> /// <param name="eventArgs">the event arguments for the event</param> /// <returns>a task that represents the asynchronous operation</returns> protected virtual Task OnPayloadReceived(PayloadReceivedEventArgs eventArgs) => PayloadReceived.InvokeAsync(this, eventArgs);
public static void PayloadReceivedConsoleHandler(object sender, PayloadReceivedEventArgs e)
{
Console.WriteLine(new string(Encoding.UTF8.GetChars(e.Payload)));
}