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codec.go
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codec.go
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//
// Copyright (C) 2019-2022 vdaas.org vald team <vald@vdaas.org>
//
// 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
//
// https://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 grpc provides generic functionality for grpc
package grpc
import (
"github.com/vdaas/vald/internal/errors"
"github.com/vdaas/vald/internal/net/grpc/proto"
)
// Codec represents a gRPC codec.
type Codec struct{}
// Name represents the codec name.
const Name = "proto"
type vtprotoMessage interface {
MarshalVT() ([]byte, error)
UnmarshalVT([]byte) error
}
// Marshal returns byte slice representing the proto message marshalling result.
func (Codec) Marshal(v interface{}) ([]byte, error) {
vt, ok := v.(vtprotoMessage)
if ok {
return vt.MarshalVT()
}
pm, ok := v.(proto.Message)
if ok {
return proto.Marshal(pm)
}
return nil, errors.ErrInvalidProtoMessageType(v)
}
// Unmarshal parses the byte stream data into v.
func (Codec) Unmarshal(data []byte, v interface{}) error {
vt, ok := v.(vtprotoMessage)
if ok {
return vt.UnmarshalVT(data)
}
pm, ok := v.(proto.Message)
if ok {
return proto.Unmarshal(data, pm)
}
return errors.ErrInvalidProtoMessageType(v)
}
func (Codec) Name() string {
return Name
}