Imports github.com/golang/glog github.com/golang/protobuf/proto github.com/golang/protobuf/protoc-gen-go/plugin github.com/grpc-ecosystem/grpc-gateway/protoc-gen-grpc-gateway/gengateway github.com/grpc-ecosystem/grpc-gateway/protoc-gen-grpc-gateway/descriptor Standard library imports flag io io/ioutil os strings