grpc_codec.go

/*
Copyright 2021 The Vitess 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.
*/

package servenv

import (
	"fmt"

	// use the original golang/protobuf package we can continue serializing
	// messages from our dependencies, particularly from etcd
	"github.com/golang/protobuf/proto" //nolint

	"google.golang.org/grpc/encoding"
	_ "google.golang.org/grpc/encoding/proto" // nolint:revive
)

// Name is the name registered for the proto compressor.
const Name = "proto"

type vtprotoCodec struct{}

type vtprotoMessage interface {
	MarshalVT() ([]byte, error)
	UnmarshalVT([]byte) error
}

func (vtprotoCodec) Marshal(v any) ([]byte, error) {
	switch v := v.(type) {
	case vtprotoMessage:
		return v.MarshalVT()
	case proto.Message:
		return proto.Marshal(v)
	default:
		return nil, fmt.Errorf("failed to marshal, message is %T, must satisfy the vtprotoMessage interface or want proto.Message", v)
	}
}

func (vtprotoCodec) Unmarshal(data []byte, v any) error {
	switch v := v.(type) {
	case vtprotoMessage:
		return v.UnmarshalVT(data)
	case proto.Message:
		return proto.Unmarshal(data, v)
	default:
		return fmt.Errorf("failed to unmarshal, message is %T, must satisfy the vtprotoMessage interface or want proto.Message", v)
	}
}

func (vtprotoCodec) Name() string {
	return Name
}

func init() {
	encoding.RegisterCodec(vtprotoCodec{})
}