Example 02: Importing a Sibling Proto File

This example demonstrates importing a proto file from the same directory.

Proto Definition

Two proto files in the same directory share the same go_package:

• types.proto — Defines shared message types (User).
• user.proto — Defines the RPC service, importing types.proto.

Both files use the same go_package with a full module path:

option go_package = "example.com/demo/pb";

user.proto imports types.proto via:

import "types.proto";

Generation Commands

First, initialize the output directory with a go.mod:

mkdir -p output && cd output && go mod init example.com/demo && cd ..

Then generate the code:

goctl rpc protoc user.proto \
  --go_out=output \
  --go-grpc_out=output \
  --zrpc_out=output \
  --go_opt=module=example.com/demo \
  --go-grpc_opt=module=example.com/demo \
  --module=example.com/demo \
  -I .

Generated directory structure:

output/
├── etc
│   └── usersvc.yaml
├── go.mod
├── internal
│   ├── config
│   │   └── config.go
│   ├── logic
│   │   ├── createuserlogic.go
│   │   └── getuserlogic.go
│   ├── server
│   │   └── userserviceserver.go
│   └── svc
│       └── servicecontext.go
├── pb
│   ├── types.pb.go
│   ├── user.pb.go
│   └── user_grpc.pb.go
├── userservice
│   └── userservice.go
└── usersvc.go

Key Points

• Two proto files (user.proto and types.proto) share the same go_package = "example.com/demo/pb", compiled into a single Go package.
• user.proto imports types.proto via import "types.proto".
• When multiple proto files share the same go_package, they compile into a single Go package.
• Only the proto file containing service definitions needs to be passed to goctl rpc protoc.
• The imported proto is automatically compiled by protoc and resolved by goctl.