Accept binary DescriptorProto as input

I would like to use a binary DescriptorProto as input to sourcePath or protoPath

wire {
    sourcePath {
        srcDir("my/dir")
        include("first_file.pb")
    }
}

Where first_file.pb is a serialized DescriptorProto.

I checked Wire's source code and I don't think there's a way to do this right now. ProtoParser expects .proto, and unfortunately protobuf-java does not support generating .proto files.

Since Wire can generate protobuf-compatible binary files, maybe it isn't too hard to accept binary as input too?

To expand on my use case, I receive a serialized FileDescriptorSet as input. On protoc, the call to generate code would be

protoc ... --descriptor_set_in=path/data_models.pb first_file_name.proto second_file_name.proto

Where first_file_name.proto and second_file_name.proto are DescriptorProto in data_models.pb, a FileDescriptorSet. When protoc doesn't find a .proto file in the filesystem, it looks if it exists in any of the descriptor_set_in parameters. If there's a FileDescriptorProto with that name, it generates the code.

Thanks!

Start by tracing the sourcePath and protoPath entry points into ProtoParser, then compare the requested behavior with protoc's descriptor_set_in handling. Use the protobuf-java types FileDescriptorSet and DescriptorProto as the stated input model; done means serialized descriptors can be accepted where the issue describes them instead of requiring .proto files.