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protobuf.go
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protobuf.go
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// Copyright (c) 2022 Palantir Technologies. All rights reserved.
//
// 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 codecs
import (
"io"
werror "github.com/palantir/witchcraft-go-error"
"google.golang.org/protobuf/proto"
)
const (
contentTypeProtobuf = "Application/x-protobuf"
)
// Protobuf codec encodes and decodes protobuf requests and responses using
// google.golang.org/protobuf.
var Protobuf Codec = codecProtobuf{}
type codecProtobuf struct{}
func (codecProtobuf) Accept() string {
return contentTypeProtobuf
}
func (codecProtobuf) Decode(r io.Reader, v interface{}) error {
msg, ok := v.(proto.Message)
if !ok {
return werror.Error("failed to decode protobuf data from type which does not implement proto.Message")
}
data, err := io.ReadAll(r)
if err != nil {
return err
}
return proto.Unmarshal(data, msg)
}
func (c codecProtobuf) Unmarshal(data []byte, v interface{}) error {
msg, ok := v.(proto.Message)
if !ok {
return werror.Error("failed to decode protobuf data from type which does not implement proto.Message")
}
return proto.Unmarshal(data, msg)
}
func (codecProtobuf) ContentType() string {
return contentTypeProtobuf
}
func (c codecProtobuf) Encode(w io.Writer, v interface{}) error {
buf, err := c.Marshal(v)
if err != nil {
return err
}
_, err = w.Write(buf)
return err
}
func (c codecProtobuf) Marshal(v interface{}) ([]byte, error) {
msg, ok := v.(proto.Message)
if !ok {
return nil, werror.Error("failed to encode protobuf data from type which does not implement proto.Message")
}
return proto.Marshal(msg)
}