Add hostname to response

cmd/hwtd/main.go

@@ -3,13 +3,18 @@ package main
 import (
 	"log"
 	"net/http"
+	"os"
 
 	"mcquay.me/hwt"
 	pb "mcquay.me/hwt/rpc/hwt"
 )
 
 func main() {
-	s := &hwt.Server{}
+	hn, err := os.Hostname()
+	if err != nil {
+		log.Fatalf("cannot get hostname: %v", err)
+	}
+	s := &hwt.Server{hn}
 	th := pb.NewHelloWorldServer(s, nil)
 	if err := http.ListenAndServe(":8080", th); err != nil {
 		log.Fatalf("listen and serve: %v", err)

hwt.go

@@ -8,11 +8,18 @@ import (
 	pb "mcquay.me/hwt/rpc/hwt"
 )
 
-type Server struct{}
+type Server struct {
+	Hostname string
+}
 
 func (s *Server) Hello(ctx context.Context, req *pb.HelloReq) (*pb.HelloResp, error) {
 	if req.Subject == "" {
 		return nil, twirp.RequiredArgumentError("subject")
 	}
-	return &pb.HelloResp{Text: fmt.Sprintf("echo: %v", req.Subject)}, nil
+
+	r := &pb.HelloResp{
+		Text:     fmt.Sprintf("echo: %v", req.Subject),
+		Hostname: s.Hostname,
+	}
+	return r, nil
 }

rpc/hwt/service.proto

@@ -14,4 +14,5 @@ message HelloReq {
 
 message HelloResp {
   string text = 1; // required
+  string hostname = 2;
 }