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factory.go
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factory.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 (
"errors"
"flag"
"github.com/Shopify/sarama"
"github.com/spf13/viper"
"github.com/uber/jaeger-lib/metrics"
"go.uber.org/zap"
"github.com/jaegertracing/jaeger/pkg/kafka/producer"
"github.com/jaegertracing/jaeger/storage/dependencystore"
"github.com/jaegertracing/jaeger/storage/spanstore"
)
// Factory implements storage.Factory and creates write-only storage components backed by kafka.
type Factory struct {
options Options
metricsFactory metrics.Factory
logger *zap.Logger
producer sarama.AsyncProducer
marshaller Marshaller
producer.Builder
}
// NewFactory creates a new Factory.
func NewFactory() *Factory {
return &Factory{}
}
// AddFlags implements plugin.Configurable
func (f *Factory) AddFlags(flagSet *flag.FlagSet) {
f.options.AddFlags(flagSet)
}
// InitFromViper implements plugin.Configurable
func (f *Factory) InitFromViper(v *viper.Viper) {
f.options.InitFromViper(v)
f.Builder = &f.options.config
}
// Initialize implements storage.Factory
func (f *Factory) Initialize(metricsFactory metrics.Factory, logger *zap.Logger) error {
f.metricsFactory, f.logger = metricsFactory, logger
logger.Info("Kafka factory",
zap.Any("producer builder", f.Builder),
zap.Any("topic", f.options.topic))
p, err := f.NewProducer()
if err != nil {
return err
}
f.producer = p
switch f.options.encoding {
case encodingProto:
f.marshaller = newProtobufMarshaller()
case encodingJSON:
f.marshaller = newJSONMarshaller()
default:
return errors.New("kafka encoding is not one of '" + encodingJSON + "' or '" + encodingProto + "'")
}
return nil
}
// CreateSpanReader implements storage.Factory
func (f *Factory) CreateSpanReader() (spanstore.Reader, error) {
return nil, errors.New("kafka storage is write-only")
}
// CreateSpanWriter implements storage.Factory
func (f *Factory) CreateSpanWriter() (spanstore.Writer, error) {
return NewSpanWriter(f.producer, f.marshaller, f.options.topic, f.metricsFactory, f.logger), nil
}
// CreateDependencyReader implements storage.Factory
func (f *Factory) CreateDependencyReader() (dependencystore.Reader, error) {
return nil, errors.New("kafka storage is write-only")
}