Hi, we've been using protobuf-net with much joy for sometime but have a
tiny issue which I'm hoping someone might be able to guide us on...
when using enums, is there a way to get protobuf-net fallback to a default
value when its using a older model version for backwards compatibility, for
example, given
enum ReqRepType
{
UnknownReqRepType = 0;
Login = 1;
SayHello = 2; //added in a later version of the model
}
message Batch
{
repeated Request requests = 1;
}
message Request
{
optional ReqRepType rrType = 1 [default = UnknownReqRepType];
}
if we deserialize a proto binary that has the enum value "SayHello" in a
batch's request collection on an older binary that is not aware of the enum
value 2 - we'd like it to fallback to the default "UnknownReqRepType" but
we get an error:
Failed to load ..\..\..\datafiles\v2.proto
ProtoBuf.ProtoException: No com.spaceape.proto.test.ReqRepType enum is
mapped to the wire-value 2
at ProtoBuf.ProtoReader.ThrowEnumException(Type type, Int32 value)
at PersistenceSerializer.Read(Request , ProtoReader )
at PersistenceSerializer.Read(Batch , ProtoReader )
at PersistenceSerializer.Deserialize(Int32 , Object , ProtoReader )
at ProtoBuf.Meta.TypeModel.DeserializeCore(ProtoReader reader, Type
type, Object value, Boolean noAutoCreate)
at ProtoBuf.Meta.TypeModel.Deserialize(Stream source, Object value, Type
type, SerializationContext context)
at ProtoBuf.Meta.TypeModel.Deserialize(Stream source, Object value, Type
type)
at prototest.Program.Load[T](String path) in
c:\temp\proto\prototest-v1\Program.cs:line 74Failed to load file
our Java version works ok and it gracefully falls back to UnknownReqRepType.
Are we missing an option in the code gen? (Tested against protobuf-net
2.0.0.668 and protoc 2.4.1)
Can provide a simple project to demo this issue if needed.
thanks,
Andy
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