In Go, using google.golang.org/protobuf@v1.25.0, I can turn a proto.Message
m into a serialized description of its type like this:
ref := m.ProtoReflect()
desc := ref.Descriptor()
descProto := protodesc.ToDescriptorProto(desc)
proto.Marshal(descProto)
I would like to take a serialized type t like this and turn it back into a
(blank) proto.Message of the appropriate type. (Error checks etc. omitted
for clarity.)
var descProto descriptorpb.DescriptorProto
err := proto.Unmarshal(t, &descProto)
desc := ThisOperationDoesNotExist(&descProto) // The problem.
m := dynamicpb.NewMessage(desc)
I've been able to make ThisOperationDoesNotExist work by faking up a
FileDescriptorSet, like this:
descProtos := []*descriptorpb.DescriptorProto{&descProto}
name := "x"
fdProtos := []*descriptorpb.FileDescriptorProto{{Name: &name, MessageType:
descProtos}}
fdSet := &descriptorpb.FileDescriptorSet{File: fdProtos}
f, err := protodesc.NewFiles(fdSet)
&descriptorpb.FileDescriptorSet{File: []*descriptorpb.FileDescriptorProto{{
Name: &name, MessageType: []*descriptorpb.DescriptorProto{&dp}}}})
var desc protoreflect.MessageDescriptor
f.RangeFiles(func(fileDesc protoreflect.FileDescriptor) bool {
msgDescs := fileDesc.Messages()
desc = msgDescs.Get(0)
})
but that's pretty ugly, and probably brittle. Is there another way? And if
there isn't, can one be added?
Thanks,
- Bob
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