Unwanted namespacing warning/ or error

[mamaart]

What version of gRPC are you using?

1.59.0

What version of Go are you using (go version)?

1.21.4

What operating system (Linux, Windows, …) and version?

Linux 6.6.4-arch1-1

What did you do?

I have multiple protos defined in a git repo and the generated code is in this repo as well and I use it to import the functionality into the server and clients.

├── events_service
│   ├── admin.proto
│   ├── golang
│   │   ├── admin
│   │   │   ├── admin_grpc.pb.go
│   │   │   └── admin.pb.go
│   │   ├── generate.sh
│   │   ├── go.mod
│   │   ├── go.sum
│   │   ├── shared
│   │   │   └── shared.pb.go
│   │   └── user
│   │   ├── user_grpc.pb.go
│   │   └── user.pb.go
│   ├── shared.proto
│   └── user.proto
├── mailbox_service
│   ├── admin.proto
│   ├── golang
│   │   ├── admin
│   │   │   ├── admin_grpc.pb.go
│   │   │   └── admin.pb.go
│   │   ├── generate.sh
│   │   ├── go.mod
│   │   └── user
│   │   ├── user_grpc.pb.go
│   │   └── user.pb.go
│   └── user.proto
├── member_service
│   ├── admin.proto
│   ├── golang
│   │   ├── admin
│   │   │   ├── admin_grpc.pb.go
│   │   │   └── admin.pb.go
│   │   ├── generate.sh
│   │   ├── go.mod
│   │   ├── registration
│   │   │   ├── registration_grpc.pb.go
│   │   │   └── registration.pb.go
│   │   ├── shared
│   │   │   └── shared.pb.go
│   │   └── statistics
│   │   ├── statistics_grpc.pb.go
│   │   └── statistics.pb.go
│   ├── registration.proto
│   ├── shared.proto
│   └── statistics.proto
└── README.md

• events service
• mailbox service
• member service

They are not related to eachother.

Inside some of them have a protofile called shared (its only used inside the domain and not shared with the others.)

When I have a client application that use all of the protos I get a panic, but I managed to reduce it to a warning after reading the FAQ in the error message.

I have even namespaced the package name in the proto - for instance:

syntax = "proto3";

package eventsservice.shared;

option go_package = "github.com/dk-slack/protos/events_service/golang/shared";

What did you expect to see?

Nothing, no warning and no errors.

What did you see instead?

After running this:

❯ GOLANG_PROTOBUF_REGISTRATION_CONFLICT=warn go run ./cmd

WARNING: proto: file "shared.proto" is already registered
	previously from: "github.com/dk-slack/protos/events_service/golang/shared"
	currently from:  "github.com/dk-slack/protos/member_service/golang/shared"
See https://protobuf.dev/reference/go/faq#namespace-conflict

WARNING: proto: file "admin.proto" is already registered
	previously from: "github.com/dk-slack/protos/events_service/golang/admin"
	currently from:  "github.com/dk-slack/protos/member_service/golang/admin"
See https://protobuf.dev/reference/go/faq#namespace-conflict

[easwars]

This feels like a protobuf issue and not a grpc issue. Please open an issue with the protobuf repository. Thanks.