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gogocompat.go
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gogocompat.go
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// Copyright 2019 The Skycfg Authors.
//
// Licensed 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.
//
// SPDX-License-Identifier: Apache-2.0
// Package gogocompat is a compatibility shim for GoGo.
package gogocompat
import (
"reflect"
"strings"
gogo_proto "github.com/gogo/protobuf/proto"
"github.com/golang/protobuf/proto"
impl "github.com/chhsia0/skycfg/internal/go/skycfg"
)
type unstableProtoRegistry interface {
impl.ProtoRegistry
}
type protoRegistry struct{}
func (*protoRegistry) UnstableProtoMessageType(name string) (reflect.Type, error) {
if t := proto.MessageType(name); t != nil {
return t, nil
}
name = strings.TrimPrefix(name, "gogo:")
if t := gogo_proto.MessageType(name); t != nil {
return t, nil
}
return nil, nil
}
func (*protoRegistry) UnstableEnumValueMap(name string) map[string]int32 {
if ev := proto.EnumValueMap(name); ev != nil {
return ev
}
if ev := gogo_proto.EnumValueMap(name); ev != nil {
return ev
}
return nil
}
// ProtoRegistry returns a Protobuf message registry that falls back to GoGo.
//
// To support types that might differ between Protobuf and GoGo registrations,
// the special prefix "gogo:" can be used to skip looking up messages in the
// standard Protobuf registry.
//
// pb = proto.package("google.protobuf")
// gogo_pb = proto.package("gogo:google.protobuf")
// # pb.Timestamp and gogo_pb.Timestamp are distinct types.
//
// The exact type of the return value is not yet stabilized, but the result
// is guaranteed to be accepted by the skycfg.WithProtoRegistry() load option.
func ProtoRegistry() unstableProtoRegistry {
return &protoRegistry{}
}