Add server side streaming test

grpc/backend/backend.go

@@ -2,6 +2,8 @@ package backend
 
 import (
 	"context"
+	"strconv"
+	"time"
 
 	"google.golang.org/genproto/googleapis/rpc/errdetails"
 	"google.golang.org/grpc/codes"
@@ -40,5 +42,15 @@ func (b Backend) GetUser(ctx context.Context, req *server.GetUserRequest) (*serv
 }
 
 func (b Backend) GetUsers(req *server.GetUsersRequest, srv server.Backend_GetUsersServer) error {
+	for index := 0; index < int(req.GetNumUsers()); index++ {
+		err := srv.Send(&server.User{
+			Id: strconv.Itoa(index),
+		})
+		if err != nil {
+			return err
+		}
+		time.Sleep(time.Second)
+	}
+
 	return nil
 }

grpc/frontend/frontend.go

@@ -3,6 +3,7 @@ package main
 import (
 	"context"
 	"fmt"
+	"io"
 
 	_ "google.golang.org/genproto/googleapis/rpc/errdetails"
 	"google.golang.org/grpc/status"
@@ -39,4 +40,27 @@ func main() {
 	} else {
 		fmt.Println(resp.GetId())
 	}
+
+	srv, err := client.GetUsers(context.Background(), &server.GetUsersRequest{
+		NumUsers: 3,
+	})
+	if err != nil {
+		st := status.Convert(err)
+		fmt.Println(st.Code(), st.Message(), st.Details())
+	} else {
+		for {
+			user, err := srv.Recv()
+			if err != nil {
+				if err != io.EOF {
+					st := status.Convert(err)
+					fmt.Println(st.Code(), st.Message(), st.Details())
+				}
+				break
+			}
+
+			fmt.Println(user.GetId())
+		}
+	}
+
+	fmt.Println("finished")
 }