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kafka_exporter.go
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/
kafka_exporter.go
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// Copyright The OpenTelemetry 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 kafkaexporter // import "github.com/open-telemetry/opentelemetry-collector-contrib/exporter/kafkaexporter"
import (
"context"
"errors"
"fmt"
"github.com/Shopify/sarama"
"go.opentelemetry.io/collector/component"
"go.opentelemetry.io/collector/consumer/consumererror"
"go.opentelemetry.io/collector/pdata/plog"
"go.opentelemetry.io/collector/pdata/pmetric"
"go.opentelemetry.io/collector/pdata/ptrace"
"go.uber.org/zap"
)
var errUnrecognizedEncoding = fmt.Errorf("unrecognized encoding")
// kafkaTracesProducer uses sarama to produce trace messages to Kafka.
type kafkaTracesProducer struct {
producer sarama.SyncProducer
topic string
marshaler TracesMarshaler
logger *zap.Logger
}
type kafkaErrors struct {
count int
err string
}
func (ke kafkaErrors) Error() string {
return fmt.Sprintf("Failed to deliver %d messages due to %s", ke.count, ke.err)
}
func (e *kafkaTracesProducer) tracesPusher(ctx context.Context, td ptrace.Traces) error {
sinkId := ctx.Value("sink-id").(string)
topic := e.topic + "-" + sinkId
e.logger.Info("Pushing traces to kafka topic = " + topic )
messages, err := e.marshaler.Marshal(td, topic)
if err != nil {
return consumererror.NewPermanent(err)
}
err = e.producer.SendMessages(messages)
if err != nil {
var prodErr sarama.ProducerErrors
if errors.As(err, &prodErr) {
if len(prodErr) > 0 {
return kafkaErrors{len(prodErr), prodErr[0].Err.Error()}
}
}
return err
}
return nil
}
func (e *kafkaTracesProducer) Close(context.Context) error {
return e.producer.Close()
}
// kafkaMetricsProducer uses sarama to produce metrics messages to kafka
type kafkaMetricsProducer struct {
producer sarama.SyncProducer
topic string
marshaler MetricsMarshaler
logger *zap.Logger
}
func (e *kafkaMetricsProducer) metricsDataPusher(ctx context.Context, md pmetric.Metrics) error {
sinkId := ctx.Value("sink_id").(string)
topic := e.topic + "-" + sinkId
e.logger.Info("Pushing metrics to kafka topic = " + topic )
messages, err := e.marshaler.Marshal(md, topic)
if err != nil {
return consumererror.NewPermanent(err)
}
err = e.producer.SendMessages(messages)
if err != nil {
var prodErr sarama.ProducerErrors
if errors.As(err, &prodErr) {
if len(prodErr) > 0 {
return kafkaErrors{len(prodErr), prodErr[0].Err.Error()}
}
}
return err
}
return nil
}
func (e *kafkaMetricsProducer) Close(context.Context) error {
return e.producer.Close()
}
// kafkaLogsProducer uses sarama to produce logs messages to kafka
type kafkaLogsProducer struct {
producer sarama.SyncProducer
topic string
marshaler LogsMarshaler
logger *zap.Logger
}
func (e *kafkaLogsProducer) logsDataPusher(ctx context.Context, ld plog.Logs) error {
sinkId := ctx.Value("sink-id").(string)
topic := e.topic + "-" + sinkId
e.logger.Info("Pushing logs to kafka topic = " + topic )
messages, err := e.marshaler.Marshal(ld, topic)
if err != nil {
return consumererror.NewPermanent(err)
}
err = e.producer.SendMessages(messages)
if err != nil {
var prodErr sarama.ProducerErrors
if errors.As(err, &prodErr) {
if len(prodErr) > 0 {
return kafkaErrors{len(prodErr), prodErr[0].Err.Error()}
}
}
return err
}
return nil
}
func (e *kafkaLogsProducer) Close(context.Context) error {
return e.producer.Close()
}
func newSaramaProducer(config Config) (sarama.SyncProducer, error) {
c := sarama.NewConfig()
// These setting are required by the sarama.SyncProducer implementation.
c.Producer.Return.Successes = true
c.Producer.Return.Errors = true
c.Producer.RequiredAcks = config.Producer.RequiredAcks
// Because sarama does not accept a Context for every message, set the Timeout here.
c.Producer.Timeout = config.Timeout
c.Metadata.Full = config.Metadata.Full
c.Metadata.Retry.Max = config.Metadata.Retry.Max
c.Metadata.Retry.Backoff = config.Metadata.Retry.Backoff
c.Producer.MaxMessageBytes = config.Producer.MaxMessageBytes
c.Producer.Flush.MaxMessages = config.Producer.FlushMaxMessages
if config.ProtocolVersion != "" {
version, err := sarama.ParseKafkaVersion(config.ProtocolVersion)
if err != nil {
return nil, err
}
c.Version = version
}
if err := ConfigureAuthentication(config.Authentication, c); err != nil {
return nil, err
}
compression, err := saramaProducerCompressionCodec(config.Producer.Compression)
if err != nil {
return nil, err
}
c.Producer.Compression = compression
producer, err := sarama.NewSyncProducer(config.Brokers, c)
if err != nil {
return nil, err
}
return producer, nil
}
func newMetricsExporter(config Config, set component.ExporterCreateSettings, marshalers map[string]MetricsMarshaler) (*kafkaMetricsProducer, error) {
marshaler := marshalers[config.Encoding]
if marshaler == nil {
return nil, errUnrecognizedEncoding
}
producer, err := newSaramaProducer(config)
if err != nil {
return nil, err
}
return &kafkaMetricsProducer{
producer: producer,
topic: config.Topic,
marshaler: marshaler,
logger: set.Logger,
}, nil
}
// newTracesExporter creates Kafka exporter.
func newTracesExporter(config Config, set component.ExporterCreateSettings, marshalers map[string]TracesMarshaler) (*kafkaTracesProducer, error) {
marshaler := marshalers[config.Encoding]
if marshaler == nil {
return nil, errUnrecognizedEncoding
}
producer, err := newSaramaProducer(config)
if err != nil {
return nil, err
}
return &kafkaTracesProducer{
producer: producer,
topic: config.Topic,
marshaler: marshaler,
logger: set.Logger,
}, nil
}
func newLogsExporter(config Config, set component.ExporterCreateSettings, marshalers map[string]LogsMarshaler) (*kafkaLogsProducer, error) {
marshaler := marshalers[config.Encoding]
if marshaler == nil {
return nil, errUnrecognizedEncoding
}
producer, err := newSaramaProducer(config)
if err != nil {
return nil, err
}
return &kafkaLogsProducer{
producer: producer,
topic: config.Topic,
marshaler: marshaler,
logger: set.Logger,
}, nil
}