To compile the proto buffers definition you need to install version latest version of protocol buffers.

See https://github.com/google/protobuf/releases for releases and https://developers.google.com/protocol-buffers/ for documentation.

Install the necessary go packages:

go get -u github.com/golang/protobuf/protoc-gen-go
go get -u google.golang.org/grpc

To generate code run in this directory:

go generate ./...

Or use protoc directly:

protoc --go_out=plugins=grpc:. diffservice.proto