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marshaler.go
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/
marshaler.go
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// Copyright 2016 The Cockroach 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 protoutil
import (
"io"
"io/ioutil"
"github.com/gogo/protobuf/proto"
gwruntime "github.com/grpc-ecosystem/grpc-gateway/runtime"
"github.com/pkg/errors"
"github.com/cockroachdb/cockroach/pkg/util/httputil"
)
var _ gwruntime.Marshaler = (*ProtoPb)(nil)
// ProtoPb is a gwruntime.Marshaler that uses github.com/gogo/protobuf/proto.
type ProtoPb struct{}
// ContentType implements gwruntime.Marshaler.
func (*ProtoPb) ContentType() string {
return httputil.ProtoContentType
}
// Marshal implements gwruntime.Marshaler.
func (*ProtoPb) Marshal(v interface{}) ([]byte, error) {
if p, ok := v.(proto.Message); ok {
return Marshal(p)
}
return nil, errors.Errorf("unexpected type %T does not implement %s", v, typeProtoMessage)
}
// Unmarshal implements gwruntime.Marshaler.
func (*ProtoPb) Unmarshal(data []byte, v interface{}) error {
if p, ok := v.(proto.Message); ok {
return proto.Unmarshal(data, p)
}
return errors.Errorf("unexpected type %T does not implement %s", v, typeProtoMessage)
}
type protoDecoder struct {
r io.Reader
}
// NewDecoder implements gwruntime.Marshaler.
func (*ProtoPb) NewDecoder(r io.Reader) gwruntime.Decoder {
return &protoDecoder{r: r}
}
// Decode implements gwruntime.Marshaler.
func (d *protoDecoder) Decode(v interface{}) error {
if p, ok := v.(proto.Message); ok {
bytes, err := ioutil.ReadAll(d.r)
if err == nil {
err = proto.Unmarshal(bytes, p)
}
return err
}
return errors.Errorf("unexpected type %T does not implement %s", v, typeProtoMessage)
}
type protoEncoder struct {
w io.Writer
}
// NewEncoder implements gwruntime.Marshaler.
func (*ProtoPb) NewEncoder(w io.Writer) gwruntime.Encoder {
return &protoEncoder{w: w}
}
// Encode implements gwruntime.Marshaler.
func (e *protoEncoder) Encode(v interface{}) error {
if p, ok := v.(proto.Message); ok {
bytes, err := Marshal(p)
if err == nil {
_, err = e.w.Write(bytes)
}
return err
}
return errors.Errorf("unexpected type %T does not implement %s", v, typeProtoMessage)
}