github.com/gogo/protobuf@v1.3.2/protoc-gen-gogo/testdata/extension_test.go

// Go support for Protocol Buffers - Google's data interchange format
//
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// https://github.com/golang/protobuf
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// modification, are permitted provided that the following conditions are
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// Test that we can use protocol buffers that use extensions.

package testdata

import (
	"bytes"
	"regexp"
	"testing"

	"github.com/gogo/protobuf/proto"
	base "github.com/gogo/protobuf/protoc-gen-gogo/testdata/extension_base"
	user "github.com/gogo/protobuf/protoc-gen-gogo/testdata/extension_user"
)

func TestSingleFieldExtension(t *testing.T) {
	bm := &base.BaseMessage{
		Height: proto.Int32(178),
	}

	// Use extension within scope of another type.
	vol := proto.Uint32(11)
	if err := proto.SetExtension(bm, user.E_LoudMessage_Volume, vol); err != nil {
		t.Fatal("Failed setting extension:", err)
	}
	buf, berr := proto.Marshal(bm)
	if berr != nil {
		t.Fatal("Failed encoding message with extension:", berr)
	}
	bm_new := new(base.BaseMessage)
	if err := proto.Unmarshal(buf, bm_new); err != nil {
		t.Fatal("Failed decoding message with extension:", err)
	}
	if !proto.HasExtension(bm_new, user.E_LoudMessage_Volume) {
		t.Fatal("Decoded message didn't contain extension.")
	}
	vol_out, err := proto.GetExtension(bm_new, user.E_LoudMessage_Volume)
	if err != nil {
		t.Fatal("Failed getting extension:", err)
	}
	if v := vol_out.(*uint32); *v != *vol {
		t.Errorf("vol_out = %v, expected %v", *v, *vol)
	}
	proto.ClearExtension(bm_new, user.E_LoudMessage_Volume)
	if proto.HasExtension(bm_new, user.E_LoudMessage_Volume) {
		t.Fatal("Failed clearing extension.")
	}
}

func TestMessageExtension(t *testing.T) {
	bm := &base.BaseMessage{
		Height: proto.Int32(179),
	}

	// Use extension that is itself a message.
	um := &user.UserMessage{
		Name: proto.String("Dave"),
		Rank: proto.String("Major"),
	}
	if err := proto.SetExtension(bm, user.E_LoginMessage_UserMessage, um); err != nil {
		t.Fatal("Failed setting extension:", err)
	}
	buf, berr := proto.Marshal(bm)
	if berr != nil {
		t.Fatal("Failed encoding message with extension:", berr)
	}
	bm_new := new(base.BaseMessage)
	if err := proto.Unmarshal(buf, bm_new); err != nil {
		t.Fatal("Failed decoding message with extension:", err)
	}
	if !proto.HasExtension(bm_new, user.E_LoginMessage_UserMessage) {
		t.Fatal("Decoded message didn't contain extension.")
	}
	um_out, err := proto.GetExtension(bm_new, user.E_LoginMessage_UserMessage)
	if err != nil {
		t.Fatal("Failed getting extension:", err)
	}
	if n := um_out.(*user.UserMessage).Name; *n != *um.Name {
		t.Errorf("um_out.Name = %q, expected %q", *n, *um.Name)
	}
	if r := um_out.(*user.UserMessage).Rank; *r != *um.Rank {
		t.Errorf("um_out.Rank = %q, expected %q", *r, *um.Rank)
	}
	proto.ClearExtension(bm_new, user.E_LoginMessage_UserMessage)
	if proto.HasExtension(bm_new, user.E_LoginMessage_UserMessage) {
		t.Fatal("Failed clearing extension.")
	}
}

func TestTopLevelExtension(t *testing.T) {
	bm := &base.BaseMessage{
		Height: proto.Int32(179),
	}

	width := proto.Int32(17)
	if err := proto.SetExtension(bm, user.E_Width, width); err != nil {
		t.Fatal("Failed setting extension:", err)
	}
	buf, berr := proto.Marshal(bm)
	if berr != nil {
		t.Fatal("Failed encoding message with extension:", berr)
	}
	bm_new := new(base.BaseMessage)
	if err := proto.Unmarshal(buf, bm_new); err != nil {
		t.Fatal("Failed decoding message with extension:", err)
	}
	if !proto.HasExtension(bm_new, user.E_Width) {
		t.Fatal("Decoded message didn't contain extension.")
	}
	width_out, err := proto.GetExtension(bm_new, user.E_Width)
	if err != nil {
		t.Fatal("Failed getting extension:", err)
	}
	if w := width_out.(*int32); *w != *width {
		t.Errorf("width_out = %v, expected %v", *w, *width)
	}
	proto.ClearExtension(bm_new, user.E_Width)
	if proto.HasExtension(bm_new, user.E_Width) {
		t.Fatal("Failed clearing extension.")
	}
}

func TestMessageSetWireFormat(t *testing.T) {
	osm := new(base.OldStyleMessage)
	osp := &user.OldStyleParcel{
		Name:   proto.String("Dave"),
		Height: proto.Int32(178),
	}

	if err := proto.SetExtension(osm, user.E_OldStyleParcel_MessageSetExtension, osp); err != nil {
		t.Fatal("Failed setting extension:", err)
	}

	buf, berr := proto.Marshal(osm)
	if berr != nil {
		t.Fatal("Failed encoding message:", berr)
	}

	// Data generated from Python implementation.
	expected := []byte{
		11, 16, 209, 15, 26, 9, 10, 4, 68, 97, 118, 101, 16, 178, 1, 12,
	}

	if !bytes.Equal(expected, buf) {
		t.Errorf("Encoding mismatch.\nwant %+v\n got %+v", expected, buf)
	}

	// Check that it is restored correctly.
	osm = new(base.OldStyleMessage)
	if err := proto.Unmarshal(buf, osm); err != nil {
		t.Fatal("Failed decoding message:", err)
	}
	osp_out, err := proto.GetExtension(osm, user.E_OldStyleParcel_MessageSetExtension)
	if err != nil {
		t.Fatal("Failed getting extension:", err)
	}
	osp = osp_out.(*user.OldStyleParcel)
	if *osp.Name != "Dave" || *osp.Height != 178 {
		t.Errorf("Retrieved extension from decoded message is not correct: %+v", osp)
	}
}

func main() {
	// simpler than rigging up gotest
	testing.Main(regexp.MatchString, []testing.InternalTest{
		{"TestSingleFieldExtension", TestSingleFieldExtension},
		{"TestMessageExtension", TestMessageExtension},
		{"TestTopLevelExtension", TestTopLevelExtension},
	},
		[]testing.InternalBenchmark{},
		[]testing.InternalExample{})
}