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codec.go
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codec.go
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// Copyright (c) 2021 The Jaeger 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 gogocodec
import (
"reflect"
"strings"
gogoproto "github.com/gogo/protobuf/proto"
"google.golang.org/grpc/encoding"
"google.golang.org/grpc/encoding/proto"
)
const jaegerProtoGenPkgPath = "github.com/jaegertracing/jaeger/proto-gen"
const jaegerModelPkgPath = "github.com/jaegertracing/jaeger/model"
var defaultCodec encoding.Codec
func init() {
defaultCodec = encoding.GetCodec(proto.Name)
defaultCodec.Name() // ensure it's not nil
encoding.RegisterCodec(newCodec())
}
// gogoCodec forces the use of gogo proto marshalling/unmarshalling for
// Jaeger proto types (package jaeger/gen-proto).
type gogoCodec struct{}
var _ encoding.Codec = (*gogoCodec)(nil)
func newCodec() *gogoCodec {
return &gogoCodec{}
}
// Name implements encoding.Codec
func (c *gogoCodec) Name() string {
return proto.Name
}
// Marshal implements encoding.Codec
func (c *gogoCodec) Marshal(v interface{}) ([]byte, error) {
t := reflect.TypeOf(v)
elem := t.Elem()
// use gogo proto only for Jaeger types
if useGogo(elem) {
return gogoproto.Marshal(v.(gogoproto.Message))
}
return defaultCodec.Marshal(v)
}
// Unmarshal implements encoding.Codec
func (c *gogoCodec) Unmarshal(data []byte, v interface{}) error {
t := reflect.TypeOf(v)
elem := t.Elem()
// use gogo proto only for Jaeger types
if useGogo(elem) {
return gogoproto.Unmarshal(data, v.(gogoproto.Message))
}
return defaultCodec.Unmarshal(data, v)
}
func useGogo(t reflect.Type) bool {
return t != nil && (strings.HasPrefix(t.PkgPath(), jaegerProtoGenPkgPath) || strings.HasPrefix(t.PkgPath(), jaegerModelPkgPath))
}