private void HandlePacket(ReadOnlySequence <byte> buffer, MCConnectionContext ctx, IPacketQueue packetQueue)
{
var reader = _packetReaderFactory.CreateReader(buffer);
var length = reader.ReadVarInt();
if (length > reader.Buffer.Length || length < 1 /* 1 = small ID but no fields*/)
{
_logger.LogCritical($"Read Invalid length {length:X}. Aborting");
ctx.Abort();
return;
}
var lengthLength = buffer.Length - reader.Buffer.Length;
reader = new MCPacketReader(reader.Buffer.Slice(0, length));
var id = reader.ReadVarInt();
using var packetIdScope = _logger.BeginScope($"Packet ID: {id:x2}");
_packetHandler.HandlePacket(ctx, reader, packetQueue, id);
// NOT IDEAL, but easiest
var packetSize = length + lengthLength;
ctx.Transport.Input.AdvanceTo(buffer.GetPosition(packetSize));
_metrics.Measure.Histogram.Update(MetricsRegistry.ReadPacketSize, packetSize);
}
public void HandlePacket(MCConnectionContext ctx, IPacketReader reader, IPacketQueue packetQueue, int id)
{
var packet = _resolver.GetReadablePacket(id, ctx);
if (packet == null)
{
_logger.LogInformation($"Unknown {ctx.ConnectionStage.AsString()} Packet {id:x2}");
return;
}
packet.Read(reader);
packet.Process(_logger, ctx, _serviceProvider);
}
private async Task HandleConnection(MCConnectionContext ctx)
{
var packetQueue = ctx.PacketQueue;
while (!ctx.ConnectionClosed.IsCancellationRequested)
{
var readResult = await ctx.Transport.Input.ReadAsync(ctx.ConnectionClosed);
if (readResult.IsCanceled || readResult.IsCompleted)
{
_logger.LogInformation("Connection Closed");
return;
}
var buffer = readResult.Buffer;
HandlePacket(buffer, ctx, packetQueue);
if (packetQueue.NeedsWriting)
{
packetQueue.WriteQueued();
await ctx.Transport.Output.FlushAsync();
}
}
}
