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protobuf_enc.go
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protobuf_enc.go
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// Copyright 2015 Apcera Inc. All rights reserved.
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)
}