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span_processor.go
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span_processor.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 processor
import (
"io"
"github.com/pkg/errors"
"github.com/jaegertracing/jaeger/plugin/storage/kafka"
"github.com/jaegertracing/jaeger/storage/spanstore"
)
//go:generate mockery -name=KafkaSpanProcessor
// SpanProcessor processes kafka spans
type SpanProcessor interface {
Process(input Message) error
io.Closer
}
// Message contains the fields of the kafka message that the span processor uses
type Message interface {
Value() []byte
}
// SpanProcessorParams stores the necessary parameters for a SpanProcessor
type SpanProcessorParams struct {
Writer spanstore.Writer
Unmarshaller kafka.Unmarshaller
}
// KafkaSpanProcessor implements SpanProcessor for Kafka messages
type KafkaSpanProcessor struct {
unmarshaller kafka.Unmarshaller
writer spanstore.Writer
io.Closer
}
// NewSpanProcessor creates a new KafkaSpanProcessor
func NewSpanProcessor(params SpanProcessorParams) *KafkaSpanProcessor {
return &KafkaSpanProcessor{
unmarshaller: params.Unmarshaller,
writer: params.Writer,
}
}
// Process unmarshals and writes a single kafka message
func (s KafkaSpanProcessor) Process(message Message) error {
mSpan, err := s.unmarshaller.Unmarshal(message.Value())
if err != nil {
return errors.Wrap(err, "cannot unmarshall byte array into span")
}
return s.writer.WriteSpan(mSpan)
}