public static byte[] WriteCompletionMessage(MemoryBufferWriter writer, string protocolName)
{
// Written as a MessagePack 'arr' containing at least these items:
// * A 'str': The name of the HubProtocol used for the serialization of the Completion Message
// * [A serialized Completion Message which is a 'bin']
// Any additional items are discarded.
var completionMessage = writer.DetachAndReset();
var msgPackWriter = new MessagePackWriter(writer);
msgPackWriter.WriteArrayHeader(2);
msgPackWriter.Write(protocolName);
msgPackWriter.WriteBinHeader(completionMessage.ByteLength);
foreach (var segment in completionMessage.Segments)
{
msgPackWriter.WriteRaw(segment.Span);
}
completionMessage.Dispose();
msgPackWriter.Flush();
return(writer.ToArray());
}