/// <summary>
/// Utility method to unpack from msgpack.
/// </summary>
/// <remarks>Will be used recursively to parse nested messages</remarks>
/// <param name="unpacker"></param>
/// <returns></returns>
/// <exception cref="TypeNotSupportedException">Thrown, when a datatype of msgpack is not supported, e.g. enums</exception>
/// <exception cref="ParseMessageException">Generic exception </exception>
/// <exception cref="OverflowException" >Thrown from msgpack, if a received long does not fit into an int.</exception>
protected override Message UnpackFromCore(Unpacker unpacker)
{
var message = new Message();
if (!unpacker.IsMapHeader)
{
throw new ParseMessageException("Incoming msgpack stream does not seem to be a Map, only Maps can be transcoded to Message. Did you rewind Position?");
}
var count = unpacker.ItemsCount;
while (count > 0 && AssertSuccess(unpacker.Read()))
{
count--;
if (!unpacker.LastReadData.IsRaw)
{
throw new ParseMessageException("Only strings can be keys of supported dictionaries. Sorry, only Json style here");
}
string fieldName = unpacker.LastReadData.AsString();
if (fieldName == "Topic")
{
string topic;
unpacker.ReadString(out topic);
message.Topic = topic;
continue;
}
if (fieldName == "Stamp")
{
MessagePackExtendedTypeObject ext;
unpacker.ReadMessagePackExtendedTypeObject(out ext);
message.TimeStamp = TimeSerializer.UnpackSingleObject(ext.GetBody());
continue;
}
Bin bin;
AssertSuccess(unpacker.Read());
if (unpacker.IsMapHeader) // single Message
{
bin = BinFactory.New(UnpackFromCore(unpacker));
}
else if (unpacker.IsArrayHeader) // multiples!
{
long binCount = unpacker.LastReadData.AsInt64();
if (binCount <= 0)
{
continue; // cannot infer type, so skip
}
AssertSuccess(unpacker.Read()); // populates a new MessagePackObject, GC ahoy
if (unpacker.IsMapHeader) // multiple nested messages
{
bin = BinFactory.New <Message>(UnpackFromCore(unpacker));
for (int i = 1; i < binCount; i++)
{
AssertSuccess(unpacker.Read());
bin.Add(UnpackFromCore(unpacker));
}
}
else // multiple slices
{
bin = BinFromCurrent(unpacker);
var alias = TypeIdentity.Instance[bin.GetInnerType()].Alias;
for (int i = 1; i < binCount; i++)
{
AssertSuccess(unpacker.Read());
var item = FromCurrent(unpacker, alias);
bin.Add(item);
}
}
}
else // single slice of non-Message
{
bin = BinFromCurrent(unpacker);
}
message[fieldName] = bin;
}
return(message);
}
