Our design approach with Aserto has been to have a single OPA-based decision engine integrated with a built-in directory. So Topaz carries this forward.
We do have a gRPC contract for the directory (which is pluggable in Topaz), and it would be interesting to see if there could be SpiceDB or OpenFGA implementations of that contract!
We do have a gRPC contract for the directory (which is pluggable in Topaz), and it would be interesting to see if there could be SpiceDB or OpenFGA implementations of that contract!