[tdrd]

Lots of comments here about lack of JSON support in gRPC - while that's true, it's relatively easily to bolt on using grpc-gateway (https://github.com/grpc-ecosystem/grpc-gateway).

Here's how we did it in CockroachDB: https://github.com/cockroachdb/cockroach/blob/24ed8df04719a1...

The supporting code (protoutil) is https://godoc.org/github.com/cockroachdb/cockroach/pkg/util/... and https://godoc.org/github.com/cockroachdb/cockroach/pkg/util/....