syntax = "proto3";

// 场景04：主 proto（A 层），只 import middleware.proto
// 传递依赖：A → B(middleware) → C(base)
// 预期：goctl 应同时生成 base.pb.go、middleware.pb.go、main.pb.go
package pingsvc;

option go_package = "example.com/demo/s04_transitive/pb";

import "middleware.proto";

message PingReq {
  middleware.RequestMeta meta = 1;
}

message PingReply {
  string pong = 1;
}

service PingService {
  rpc Ping(PingReq) returns (PingReply);
}