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config.go
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config.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 consumer
import (
"io"
"time"
"github.com/Shopify/sarama"
cluster "github.com/bsm/sarama-cluster"
"go.uber.org/zap"
"github.com/jaegertracing/jaeger/pkg/kafka/auth"
)
// Consumer is an interface to features of Sarama that are necessary for the consumer
type Consumer interface {
Partitions() <-chan cluster.PartitionConsumer
MarkPartitionOffset(topic string, partition int32, offset int64, metadata string)
io.Closer
}
// Builder builds a new kafka consumer
type Builder interface {
NewConsumer() (Consumer, error)
}
// Configuration describes the configuration properties needed to create a Kafka consumer
type Configuration struct {
auth.AuthenticationConfig `mapstructure:"authentication"`
Consumer
Brokers []string `mapstructure:"brokers"`
Topic string `mapstructure:"topic"`
GroupID string `mapstructure:"group_id"`
ClientID string `mapstructure:"client_id"`
ProtocolVersion string `mapstructure:"protocol_version"`
RackID string `mapstructure:"rack_id"`
}
// NewConsumer creates a new kafka consumer
func (c *Configuration) NewConsumer(logger *zap.Logger) (Consumer, error) {
saramaConfig := cluster.NewConfig()
saramaConfig.Group.Mode = cluster.ConsumerModePartitions
saramaConfig.ClientID = c.ClientID
saramaConfig.RackID = c.RackID
if len(c.ProtocolVersion) > 0 {
ver, err := sarama.ParseKafkaVersion(c.ProtocolVersion)
if err != nil {
return nil, err
}
saramaConfig.Config.Version = ver
}
if err := c.AuthenticationConfig.SetConfiguration(&saramaConfig.Config, logger); err != nil {
return nil, err
}
// cluster.NewConfig() uses sarama.NewConfig() to create the config.
// However the Jaeger OTEL module pulls in newer samara version (from OTEL collector)
// that does not set saramaConfig.Consumer.Offsets.CommitInterval to its default value 1s.
// then the samara-cluster fails if the default interval is not 1s.
saramaConfig.Consumer.Offsets.CommitInterval = time.Second
return cluster.NewConsumer(c.Brokers, c.GroupID, []string{c.Topic}, saramaConfig)
}