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// Copyright 2015-2018 The NATS 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 protobuf
import (
"errors"
"github.com/golang/protobuf/proto"
"github.com/nats-io/go-nats"
)
// Additional index for registered Encoders.
const (
PROTOBUF_ENCODER = "protobuf"
)
func init() {
// Register protobuf encoder
nats.RegisterEncoder(PROTOBUF_ENCODER, &ProtobufEncoder{})
}
// ProtobufEncoder is a protobuf implementation for EncodedConn
// This encoder will use the builtin protobuf lib to Marshal
// and Unmarshal structs.
type ProtobufEncoder struct {
// Empty
}
var (
ErrInvalidProtoMsgEncode = errors.New("nats: Invalid protobuf proto.Message object passed to encode")
ErrInvalidProtoMsgDecode = errors.New("nats: Invalid protobuf proto.Message object passed to decode")
)
// Encode
func (pb *ProtobufEncoder) Encode(subject string, v interface{}) ([]byte, error) {
if v == nil {
return nil, nil
}
i, found := v.(proto.Message)
if !found {
return nil, ErrInvalidProtoMsgEncode
}
b, err := proto.Marshal(i)
if err != nil {
return nil, err
}
return b, nil
}
// Decode
func (pb *ProtobufEncoder) Decode(subject string, data []byte, vPtr interface{}) error {
if _, ok := vPtr.(*interface{}); ok {
return nil
}
i, found := vPtr.(proto.Message)
if !found {
return ErrInvalidProtoMsgDecode
}
return proto.Unmarshal(data, i)
}
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