63 lines
2.4 KiB
C#
63 lines
2.4 KiB
C#
using System.Buffers.Binary;
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using Ananta.SDK.Network;
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using Ananta.SDK.Logging;
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using Ananta.SDK.Rpc;
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namespace Ananta.Server.Network;
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/// <summary>Decodes the small outer RPC frame envelope shared by login, gate and game sockets.</summary>
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internal static class RpcFrameDispatcher
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{
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internal static async Task DispatchAsync(
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RpcRouter router,
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TcpSession session,
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Frame frame,
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CancellationToken cancellationToken)
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{
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// Heartbeat request -> heartbeat reply.
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if (frame.Mode == 0x04)
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{
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var heartbeat = frame.Payload.Length == 8 ? frame.Payload : new byte[8];
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await session.SendFrameAsync(0x03, heartbeat, cancellationToken);
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return;
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}
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if (frame.Mode == 0x03 && frame.Payload.Length == 8)
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return;
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// Client received an invoke that it does not implement. Acknowledge it instead of
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// letting an optional compatibility RPC break the whole session.
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if (frame.Mode == 0x08 && frame.Payload.Length >= 9)
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{
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RuntimeLogs.RawFrame(session.Log.Scope, "C2S", frame.Mode, frame.Payload, "CLIENT_UNIMPLEMENTED_INVOKE");
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var methodId = BinaryPrimitives.ReadUInt32LittleEndian(frame.Payload.AsSpan(1, 4));
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var invokeId = BinaryPrimitives.ReadInt32LittleEndian(frame.Payload.AsSpan(5, 4));
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await session.ReturnAsync(methodId, invokeId, 0, Array.Empty<byte>(), cancellationToken);
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return;
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}
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if (frame.Mode == 0x09)
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{
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// Last-resort containment: the router already catches handler/fallback errors,
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// but anything that still escapes here must only cost this one frame — an
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// exception propagating to the TCP loop closes the session (client: Reconnecting).
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try
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{
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await router.DispatchAsync(session, frame, cancellationToken);
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}
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catch (OperationCanceledException)
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{
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throw;
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}
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catch (Exception ex)
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{
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session.Log.Error($"dispatch survived frame mode=0x{frame.Mode:X2} (session kept)", ex);
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}
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return;
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}
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RuntimeLogs.RawFrame(session.Log.Scope, "C2S", frame.Mode, frame.Payload, "IGNORED_FRAME_MODE");
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session.Log.Warn($"ignored frame mode={frame.Mode} payload={frame.Payload.Length}");
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}
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}
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