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message_io_util.go
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message_io_util.go
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// Copyright 2023 Ant Group Co., Ltd.
//
// 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 message
import (
"fmt"
"io"
"google.golang.org/protobuf/encoding/protojson"
"google.golang.org/protobuf/proto"
)
type ContentEncodingType int
const (
EncodingTypeUnknown ContentEncodingType = iota + 1
EncodingTypeJson
EncodingTypeProtobuf
)
var ContentType2EncodingType = map[string]ContentEncodingType{
"application/json": EncodingTypeJson,
"application/x-protobuf": EncodingTypeProtobuf,
}
var EncodingType2ContentType = map[ContentEncodingType]string{
EncodingTypeJson: "application/json",
EncodingTypeProtobuf: "application/x-protobuf",
}
var maxPrintContentLength = 1000
func DeserializeFrom(in io.ReadCloser, request proto.Message) (ContentEncodingType, error) {
if request == nil {
return EncodingTypeUnknown, fmt.Errorf("unexpected empty message")
}
body, err := io.ReadAll(in)
if err != nil {
return EncodingTypeUnknown, err
}
// try parse order(fast&strict -> slow&loose): 1. protobuf 2. json
err = proto.Unmarshal(body, request)
if err == nil {
return EncodingTypeProtobuf, nil
}
err = protojson.Unmarshal(body, request)
if err == nil {
return EncodingTypeJson, nil
}
highLimit := len(body)
if highLimit > maxPrintContentLength {
highLimit = maxPrintContentLength
}
return EncodingTypeUnknown, fmt.Errorf("got unexpected error=\"%w\" while unmarshal proto from content=%s", err, string(body[:highLimit]))
}
func SerializeTo(response proto.Message, encodingType ContentEncodingType) (content string, err error) {
if response == nil {
return "", fmt.Errorf("unexpected empty message")
}
switch encodingType {
case EncodingTypeProtobuf:
c, err := proto.Marshal(response)
return string(c), err
case EncodingTypeJson:
options := &protojson.MarshalOptions{
Multiline: false,
Indent: "",
UseProtoNames: true,
EmitUnpopulated: true,
}
c, err := options.Marshal(response)
return string(c), err
default:
return "", fmt.Errorf("not implemented")
}
}