pkg/bufman/pkg/protoencoding/reparse_unrecognized.go

// Licensed to the Apache Software Foundation (ASF) under one or more
// contributor license agreements.  See the NOTICE file distributed with
// this work for additional information regarding copyright ownership.
// The ASF licenses this file to You under the Apache License, Version 2.0
// (the "License"); you may not use this file except in compliance with
// the License.  You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package protoencoding

import (
	"google.golang.org/protobuf/proto"

	"google.golang.org/protobuf/reflect/protoreflect"
)

// ReparseUnrecognized uses the given resolver to parse any unrecognized fields in the
// given reflectMessage. It does so recursively, resolving any unrecognized fields in
// nested messages.
func ReparseUnrecognized(resolver Resolver, reflectMessage protoreflect.Message) error {
	if resolver == nil {
		return nil
	}
	unknown := reflectMessage.GetUnknown()
	if len(unknown) > 0 {
		reflectMessage.SetUnknown(nil)
		options := proto.UnmarshalOptions{
			Resolver: resolver,
			Merge:    true,
		}
		if err := options.Unmarshal(unknown, reflectMessage.Interface()); err != nil {
			return err
		}
	}
	var err error
	reflectMessage.Range(func(fieldDescriptor protoreflect.FieldDescriptor, value protoreflect.Value) bool {
		err = reparseUnrecognizedInField(resolver, fieldDescriptor, value)
		return err == nil
	})
	return err
}

func reparseUnrecognizedInField(resolver Resolver, fieldDescriptor protoreflect.FieldDescriptor, value protoreflect.Value) error {
	if fieldDescriptor.IsMap() {
		valDesc := fieldDescriptor.MapValue()
		if valDesc.Kind() != protoreflect.MessageKind && valDesc.Kind() != protoreflect.GroupKind {
			// nothing to reparse
			return nil
		}
		var err error
		value.Map().Range(func(k protoreflect.MapKey, v protoreflect.Value) bool {
			err = ReparseUnrecognized(resolver, v.Message())
			return err == nil
		})
		return err
	}
	if fieldDescriptor.Kind() != protoreflect.MessageKind && fieldDescriptor.Kind() != protoreflect.GroupKind {
		// nothing to reparse
		return nil
	}
	if fieldDescriptor.IsList() {
		list := value.List()
		for i := 0; i < list.Len(); i++ {
			if err := ReparseUnrecognized(resolver, list.Get(i).Message()); err != nil {
				return err
			}
		}
		return nil
	}
	return ReparseUnrecognized(resolver, value.Message())
}