ContextQMD
Back to Go Zero

Example 07: External Proto — Same `go_package`

tools/goctl/rpc/example/07-external-proto-same-pkg/README.md

1.10.12.1 KB
Original Source

Example 07: External Proto — Same go_package

This example demonstrates importing proto files from an external directory where both files share the same go_package.

Proto Definition

Both service.proto and ext.proto use the same go_package:

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

Source layout:

07-external-proto-same-pkg/
├── ext_protos
│   └── ext.proto        # External proto (go_package = "example.com/demo/pb")
├── service.proto        # Service definition (go_package = "example.com/demo/pb")
├── README.md
└── README-cn.md
  • ext.proto lives in a separate directory (ext_protos/), but has the same go_package as service.proto.
  • service.proto imports ext.proto and uses ext.ExtReq / ext.ExtReply as RPC types.

Generation Commands

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

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

Then generate the code (note -I ./ext_protos):

bash
goctl rpc protoc service.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 . -I ./ext_protos

Generated directory structure:

output/
├── etc
│   └── svc.yaml
├── go.mod
├── internal
│   ├── config
│   │   └── config.go
│   ├── logic
│   │   └── querylogic.go
│   ├── server
│   │   └── queryserviceserver.go
│   └── svc
│       └── servicecontext.go
├── pb
│   ├── ext.pb.go
│   ├── service.pb.go
│   └── service_grpc.pb.go
├── queryservice
│   └── queryservice.go
└── svc.go

Key Points

  • ext.proto lives in a separate directory (ext_protos/), but has the same go_package as service.proto.
  • Use -I ./ext_protos to add the external directory to the proto search path.
  • When the external proto has the same go_package, all types merge into one Go package — no cross-package imports are needed.