public bool TryParseMessage(
ref ReadOnlySequence <byte> input,
out HubMessage message,
IReadOnlyDictionary <int, Type> protobufIndexToTypeMap
)
{
// 4 bytes are required to read the length of the message
if (input.Length < 4)
{
message = null;
return(false);
}
var totalByteSize = BitConverter.ToInt32(input.Slice(0, 4).ToArray(), 0);
if (input.Length < totalByteSize)
{
message = null;
return(false);
}
var protobufInput = input.Slice(4);
var arrayPool = ArrayPool <byte> .Shared;
var byteArray = arrayPool.Rent((int)protobufInput.Length);
try
{
protobufInput.CopyTo(byteArray);
using (var inputStream = new MemoryStream(byteArray))
{
var metadata = new MessageMetadata();
metadata.MergeFixedDelimitedFrom(inputStream);
var items = new List <object>(metadata.Items.Count);
foreach (var itemMetadata in metadata.Items)
{
var item = itemMetadata.CreateItem(inputStream, protobufIndexToTypeMap);
items.Add(item);
}
message = CreateHubMessage(items);
}
input = input.Slice(totalByteSize);
return(true);
}
finally
{
arrayPool.Return(byteArray);
}
}
