Golang protobuf v2 issues with grpc

[KS Chow]

New to protobuf and grpc, was trying the grpc Quick start tutorial.

I installed latest Go (1.15.8) and protobuf (v 3.14.0).

Then I installed protobuf compiler via:

go get google.golang.org/protobuf/cmd/protoc-gen-go \ google.golang.org/grpc/cmd/protoc-gen-go-grpc

I am able to compile my test.proto to get test.pb.go and test_grpc.pb.go via:

protoc --go_out=. --go-grpc_out=. test.proto

But compiling my sample code I get errors i.e.

go\src\google.golang.org\grpc\credentials\credentials.go:31:2: cannot find package "github.com/golang/protobuf/proto" in any of: GOROOT or GOPATH

grpc is trying to import "github.com/golang/protobuf/proto" which doesnt exist, it should be pointing to google.golang.org/protobuf/proto

Any idea how to get grpc to point to protobuf v2? Or I need to switch to protobuf v1 (github.com/golang/protobuf) to work with grpc?

[Easwar Swaminathan]

gRPC-Go has a dependency on the old and new protobuf packages. See our go.mod file here: https://github.com/grpc/grpc-go/blob/master/go.mod

When you try running/compiling your example code for the first time, you should see both these dependencies being pulled down:
easwars@grpc-go:~/grpc-go/examples/helloworld$ go run greeter_server/main.go

go: downloading github.com/golang/protobuf v1.4.2

go: downloading google.golang.org/protobuf v1.25.0

go: downloading google.golang.org/genproto v0.0.0-20200806141610-86f49bd18e98

go: downloading golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a

go: downloading golang.org/x/net v0.0.0-20190311183353-d8887717615a

go: downloading golang.org/x/text v0.3.0

2021/02/11 03:49:57 Received: world

Please try going through the quickstart to see if you missed anything.

Thanks