89 lines
2.8 KiB
Go
89 lines
2.8 KiB
Go
// Copyright 2020-2021 Buf Technologies, Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package protoencoding
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import (
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"google.golang.org/protobuf/reflect/protodesc"
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"google.golang.org/protobuf/reflect/protoreflect"
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"google.golang.org/protobuf/reflect/protoregistry"
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"google.golang.org/protobuf/types/descriptorpb"
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"google.golang.org/protobuf/types/dynamicpb"
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)
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func newResolver(fileDescriptorProtos ...*descriptorpb.FileDescriptorProto) (Resolver, error) {
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if len(fileDescriptorProtos) == 0 {
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return nil, nil
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}
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// TODO: handle if resolvable
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files, err := protodesc.FileOptions{
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AllowUnresolvable: true,
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}.NewFiles(
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&descriptorpb.FileDescriptorSet{
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File: fileDescriptorProtos,
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},
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)
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if err != nil {
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return nil, err
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}
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types := &protoregistry.Types{}
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var rangeErr error
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files.RangeFiles(func(fileDescriptor protoreflect.FileDescriptor) bool {
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if err := addMessagesToTypes(types, fileDescriptor.Messages()); err != nil {
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rangeErr = err
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return false
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}
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if err := addExtensionsToTypes(types, fileDescriptor.Extensions()); err != nil {
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rangeErr = err
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return false
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}
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// There is no way to do register enum, and it is not used
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// https://github.com/golang/protobuf/issues/1065
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// https://godoc.org/google.golang.org/protobuf/types/dynamicpb does not have NewEnumType
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return true
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})
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if rangeErr != nil {
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return nil, rangeErr
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}
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return types, nil
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}
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func addMessagesToTypes(types *protoregistry.Types, messageDescriptors protoreflect.MessageDescriptors) error {
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messagesLen := messageDescriptors.Len()
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for i := 0; i < messagesLen; i++ {
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messageDescriptor := messageDescriptors.Get(i)
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if err := types.RegisterMessage(dynamicpb.NewMessageType(messageDescriptor)); err != nil {
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return err
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}
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if err := addMessagesToTypes(types, messageDescriptor.Messages()); err != nil {
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return err
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}
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if err := addExtensionsToTypes(types, messageDescriptor.Extensions()); err != nil {
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return err
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}
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}
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return nil
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}
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func addExtensionsToTypes(types *protoregistry.Types, extensionDescriptors protoreflect.ExtensionDescriptors) error {
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extensionsLen := extensionDescriptors.Len()
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for i := 0; i < extensionsLen; i++ {
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extensionDescriptor := extensionDescriptors.Get(i)
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if err := types.RegisterExtension(dynamicpb.NewExtensionType(extensionDescriptor)); err != nil {
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return err
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}
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}
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return nil
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}
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