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kafka.go
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kafka.go
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/*This file is part of sisyphus.
*
* Copyright Datto, Inc.
* Author: John Seekins <jseekins@datto.com>
*
* Licensed under the GNU General Public License Version 3
* Fedora-License-Identifier: GPLv3+
* SPDX-2.0-License-Identifier: GPL-3.0+
* SPDX-3.0-License-Identifier: GPL-3.0-or-later
*
* sisyphus is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* sisyphus is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with sisyphus. If not, see <https://www.gnu.org/licenses/>.
*/
package main
import (
"context"
"fmt"
"sync"
"time"
"github.com/confluentinc/confluent-kafka-go/kafka"
json "github.com/json-iterator/go"
log "github.com/sirupsen/logrus"
)
/*
KafkaConsumerMeta objects for creating Kafka functions
(makes for cleaner passing of data)
*/
type KafkaConsumerMeta struct {
ThreadCount int
Topics []string
Brokers string
ConsumerGroup string
ClientID string
SessionTimeout int
OffsetReset string
}
// KafkaProducerMeta : meta about Kafka producer objects
type KafkaProducerMeta struct {
Topic string
Brokers string
CompressionType string
WritePath string
TSDOrg string
TSDName string
}
/*
DeadLetterMsg :
Each message to the dead letter queue may be for a different tenant
We'll need this struct to ensure we have metadata
*/
type DeadLetterMsg struct {
WritePath string
TSDOrg string
TSDName string
Message string
}
var (
deliveryChan chan kafka.Event
)
/*
Dead letter queue section
Here we collect messages that didn't write successfully and push them back into Kafka
*/
func processFailed(msg DeadLetterMsg, topic string, producer *kafka.Producer) {
FailedTimeStart := time.Now()
thisMsg, err := json.Marshal(msg)
if err != nil {
log.WithFields(log.Fields{"message": msg, "error": err}).Fatal("Failed to deserialize message for dead letter queue")
}
err = producer.Produce(&kafka.Message{
TopicPartition: kafka.TopicPartition{Topic: &topic, Partition: kafka.PartitionAny},
Value: thisMsg,
}, nil)
if err != nil {
log.WithFields(log.Fields{"error": err}).Fatal("Couldn't write message to dead letter queue")
}
FailedMsgs.Inc()
FailedWriteTime.Add(float64(time.Now().Sub(FailedTimeStart)) / TimeSegmentDivisor)
}
// SendFailedToKafka : Exposed function for sending failed write attempts to our dead letter queue
func SendFailedToKafka(ctx context.Context, channel chan string, prodMeta KafkaProducerMeta, wg *sync.WaitGroup) {
/*
Dead letter messages should contain:
1. the endpoint they were being sent to (to handle tenancy)
2. the actual metric that failed to write
3. the topic they came from
*/
log.WithFields(log.Fields{"section": "failedwrites"}).Info("Starting failed writes thread...")
defer wg.Done()
producer, err := kafka.NewProducer(
&kafka.ConfigMap{
"bootstrap.servers": prodMeta.Brokers,
"compression.type": prodMeta.CompressionType,
"go.delivery.reports": false})
if err != nil {
log.WithFields(log.Fields{"error": err, "section": "failedwrites"}).Fatal("Couldn't build Kafka producer")
}
defer producer.Close()
failedloop:
for {
select {
case msg := <-channel:
processFailed(DeadLetterMsg{Message: msg, WritePath: prodMeta.WritePath,
TSDOrg: prodMeta.TSDOrg, TSDName: prodMeta.TSDName}, prodMeta.Topic, producer)
case <-ctx.Done():
// we want to drain the queue before we completely close (if possible)
log.WithFields(log.Fields{"section": "failedwrites"}).Info("Closing failed writes thread...")
for msg := range channel {
processFailed(DeadLetterMsg{Message: msg, WritePath: prodMeta.WritePath,
TSDOrg: prodMeta.TSDOrg, TSDName: prodMeta.TSDName}, prodMeta.Topic, producer)
}
// wait for producer to flush for 10 seconds
producer.Flush(10 * 1000)
break failedloop
}
}
}
//ReadFromKafka : Allow for reading Influx or Prometheus-style stats through a boolean
func ReadFromKafka(ctx context.Context, cfg KafkaConsumerMeta, outputChannel chan []byte, wg *sync.WaitGroup) {
log.WithFields(log.Fields{"threadNum": cfg.ThreadCount, "section": "kafka reader"}).Info("Starting Sisyphus ingest thread...")
defer wg.Done()
consumer, err := kafka.NewConsumer(&kafka.ConfigMap{
"bootstrap.servers": cfg.Brokers,
"client.id": fmt.Sprintf("%v-%v", cfg.ClientID, cfg.ThreadCount),
"group.id": cfg.ConsumerGroup,
"session.timeout.ms": cfg.SessionTimeout,
"go.events.channel.enable": true,
"enable.partition.eof": true,
"enable.auto.commit": true,
"auto.offset.reset": cfg.OffsetReset})
if err != nil {
log.WithFields(log.Fields{"threadNum": cfg.ThreadCount, "error": err, "section": "kafka reader"}).Fatal("Couldn't build consumer")
}
defer consumer.Close()
err = consumer.SubscribeTopics(cfg.Topics, nil)
if err != nil {
log.WithFields(log.Fields{"threadNum": cfg.ThreadCount, "error": err, "section": "kafka reader"}).Fatal("Couldn't subscribe to topics")
}
log.WithFields(log.Fields{"threadNum": cfg.ThreadCount, "brokers": cfg.Brokers, "topics": cfg.Topics, "section": "kafka reader"}).Info("Consumer Started")
readloop:
for {
select {
case ev := <-consumer.Events():
ingestTimeStart := time.Now()
switch e := ev.(type) {
case kafka.AssignedPartitions:
log.WithFields(log.Fields{"threadNum": cfg.ThreadCount, "msg": e, "section": "kafka reader"}).Debug("Assigning partitions...")
err := consumer.Assign(e.Partitions)
if err != nil {
log.WithFields(log.Fields{"threadNum": cfg.ThreadCount, "msg": e, "section": "kafka reader"}).Error("Couldn't assign partitions")
}
case kafka.RevokedPartitions:
log.WithFields(log.Fields{"threadNum": cfg.ThreadCount, "msg": e, "section": "kafka reader"}).Debug("Revoked partitions...")
err := consumer.Unassign()
if err != nil {
log.WithFields(log.Fields{"threadNum": cfg.ThreadCount, "msg": e, "section": "kafka reader"}).Error("Couldn't unassign partitions")
}
case kafka.PartitionEOF:
log.WithFields(log.Fields{"threadNum": cfg.ThreadCount, "msg": e, "section": "kafka reader"}).Debug("End of partition...")
case *kafka.Message:
IngestMsgs.Inc()
outputChannel <- e.Value
case kafka.Error:
// Errors should generally be considered as informational, the client will try to automatically recover
log.WithFields(log.Fields{"threadNum": cfg.ThreadCount, "error": e, "section": "kafka reader"}).Error("Kafka Error, recovering...")
}
IngestTime.Add(float64(time.Now().Sub(ingestTimeStart)) / TimeSegmentDivisor)
case <-ctx.Done():
log.WithFields(log.Fields{"threadNum": cfg.ThreadCount, "section": "kafka reader"}).Info("Closing ingest thread...")
break readloop
}
}
}