You need to install few things to start contributing:

• The protoc tool, a protocol buffer compiler.

• The following compiler plugins:

$ go install google.golang.org/protobuf/cmd/protoc-gen-go@latest
$ go install google.golang.org/grpc/cmd/protoc-gen-go-grpc@latest

To update generated files:

make generate_grpc_code

to update the go libs

go get -u google.golang.org/grpc

it should fade the errors in pubsub_grpc.pb.go and pubsub.pb.go

To cleanup go.mod run this:

go mod tidy

if error persists in go.mod delete go.sum and rerun go mod tidy

export GO_PATH=~/go export PATH=$PATH:/$GO_PATH/bin source ~/.bash_profile