feat(go-client): find descriptors by proto fullname (#123)

Author: h4rikris

clients/go/client_test.go

@@ -219,6 +219,18 @@ func TestClient(t *testing.T) {
 			field := msg.Fields().ByName("field_one")
 			assert.NotNil(t, field)
 		})
+		t.Run("should get descriptor if package name is not defined", func(t *testing.T) {
+			msg, err := client.GetDescriptor("Root")
+			assert.Nil(t, err)
+			field := msg.Fields().ByName("field_one")
+			assert.NotNil(t, field)
+		})
+		t.Run("should get descriptor if proto package name is not defined but java package is defined", func(t *testing.T) {
+			msg, err := client.GetDescriptor("test.stencil.Root")
+			assert.Nil(t, err)
+			field := msg.Fields().ByName("field_one")
+			assert.NotNil(t, field)
+		})
 	})
 	t.Run("Parse", func(t *testing.T) {
 		data, err := getDescriptorData(t, true)

clients/go/protoutils.go

@@ -27,6 +27,8 @@ func defaultKeyFn(msg protoreflect.MessageDescriptor) string {
 	pkg := getJavaPackage(file)
 	if pkg == "" {
 		return fullName
+	} else if protoPackage == "" {
+		return fmt.Sprintf("%s.%s", pkg, fullName)
 	}
 	return strings.Replace(fullName, protoPackage, pkg, 1)
 }

clients/go/resolver.go

@@ -20,7 +20,7 @@ type Resolver struct {
 func (r *Resolver) Get(className string) (protoreflect.MessageType, bool) {
 	fullName, ok := r.javaToProtoName[className]
 	if !ok {
-		return nil, false
+		fullName = className
 	}
 	msg, err := r.types.FindMessageByName(protoreflect.FullName(fullName))
 	if err != nil {

clients/go/test_data/3.proto

@@ -0,0 +1,5 @@
+syntax = "proto3";
+option java_package = "test.stencil";
+message Root {
+  int64 field_one = 1;
+}