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marshaller.go
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/
marshaller.go
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// Copyright (c) 2018 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 kafka
import (
"bytes"
"github.com/gogo/protobuf/jsonpb"
"github.com/gogo/protobuf/proto"
"github.com/jaegertracing/jaeger/model"
)
// Marshaller encodes a span into a byte array to be sent to Kafka
type Marshaller interface {
Marshal(*model.Span) ([]byte, error)
}
type protobufMarshaller struct{}
func newProtobufMarshaller() *protobufMarshaller {
return &protobufMarshaller{}
}
// Marshal encodes a span as a protobuf byte array
func (h *protobufMarshaller) Marshal(span *model.Span) ([]byte, error) {
return proto.Marshal(span)
}
type jsonMarshaller struct {
pbMarshaller *jsonpb.Marshaler
}
func newJSONMarshaller() *jsonMarshaller {
return &jsonMarshaller{&jsonpb.Marshaler{}}
}
// Marshal encodes a span as a json byte array
func (h *jsonMarshaller) Marshal(span *model.Span) ([]byte, error) {
out := new(bytes.Buffer)
err := h.pbMarshaller.Marshal(out, span)
return out.Bytes(), err
}