brew install golang protobuf
go install google.golang.org/protobuf/cmd/protoc-gen-go@latest
go install google.golang.org/grpc/cmd/protoc-gen-go-grpc@latest
# after modifying pb/proto-v2.proto
go generate -x ./...
# run the servers
go run cmd/gateway-server/main.go &
go run cmd/target-server/main.go &
# run the client
go run cmd/client/main.go
pb/proto-v1.proto and pb/proto-v2.proto are nearly the same file, with only additional request fields added to proto-v2.proto. Model code generated for v2 is placed in a separate import path. cmd/client and cmd/target-server use the /v2 import path, and cmd/gateway-server uses the bare import path.
Project demonstrates that when sharing nested protobuf messages, an intermediate server does not need to be re-compiled in-order to receive forward types from an vN+1 client and vN+1 server dependency