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vt_grpc.go
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vt_grpc.go
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// 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.
// This implementation is based on
// https://github.com/vitessio/vitess/blob/main/go/vt/servenv/grpc_codec.go
// Package api holds api related files
package api
import (
fmt "fmt"
"google.golang.org/grpc/encoding"
_ "google.golang.org/grpc/encoding/proto" // for default proto registration purposes
"google.golang.org/protobuf/proto"
)
// VTProtoCodecName represents the name of the vtproto codec, using vtproto instead of the default marshalling functions
const VTProtoCodecName = "vtproto"
// maybeVTCodec represents a codec able to encode and decode vt enabled proto messages
type maybeVTCodec struct{}
type vtprotoMessage interface {
MarshalVT() ([]byte, error)
UnmarshalVT([]byte) error
}
// Marshal encodes the protobuf message to a byte array
func (maybeVTCodec) Marshal(v interface{}) ([]byte, error) {
vt, ok := v.(vtprotoMessage)
if ok {
return vt.MarshalVT()
}
msg, ok := v.(proto.Message)
if !ok {
return nil, fmt.Errorf("failed to marshal, message is %T, want proto.Message", v)
}
return proto.Marshal(msg)
}
// Unmarshal decodes the byte array to the provided value
func (maybeVTCodec) Unmarshal(data []byte, v interface{}) error {
vt, ok := v.(vtprotoMessage)
if ok {
return vt.UnmarshalVT(data)
}
msg, ok := v.(proto.Message)
if !ok {
return fmt.Errorf("failed to unmarshal, message is %T, want proto.Message", v)
}
return proto.Unmarshal(data, msg)
}
// Name returns the name of the codec
func (maybeVTCodec) Name() string {
return VTProtoCodecName
}
func init() {
encoding.RegisterCodec(maybeVTCodec{})
}