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data_recorder_kafka.go
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data_recorder_kafka.go
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package handler
import (
"crypto/tls"
"crypto/x509"
"fmt"
"os"
"strings"
"time"
"github.com/openflagr/flagr/pkg/config"
"github.com/openflagr/flagr/pkg/util"
"github.com/openflagr/flagr/swagger_gen/models"
"github.com/Shopify/sarama"
"github.com/sirupsen/logrus"
)
var (
saramaNewAsyncProducer = sarama.NewAsyncProducer
)
func mustParseKafkaVersion(version string) sarama.KafkaVersion {
v, err := sarama.ParseKafkaVersion(version)
if err != nil {
panic(err)
}
return v
}
// NewKafkaRecorder creates a new Kafka recorder
var NewKafkaRecorder = func() DataRecorder {
cfg := sarama.NewConfig()
tlscfg := createTLSConfiguration(
config.Config.RecorderKafkaCertFile,
config.Config.RecorderKafkaKeyFile,
config.Config.RecorderKafkaCAFile,
config.Config.RecorderKafkaVerifySSL,
config.Config.RecorderKafkaSimpleSSL,
)
if tlscfg != nil {
cfg.Net.TLS.Enable = true
cfg.Net.TLS.Config = tlscfg
}
if config.Config.RecorderKafkaSASLUsername != "" && config.Config.RecorderKafkaSASLPassword != "" {
cfg.Net.SASL.Enable = true
cfg.Net.SASL.User = config.Config.RecorderKafkaSASLUsername
cfg.Net.SASL.Password = config.Config.RecorderKafkaSASLPassword
}
cfg.Net.MaxOpenRequests = config.Config.RecorderKafkaMaxOpenReqs
cfg.Producer.Compression = sarama.CompressionCodec(config.Config.RecorderKafkaCompressionCodec)
cfg.Producer.RequiredAcks = sarama.RequiredAcks(config.Config.RecorderKafkaRequiredAcks)
cfg.Producer.Idempotent = config.Config.RecorderKafkaIdempotent
cfg.Producer.Retry.Max = config.Config.RecorderKafkaRetryMax
cfg.Producer.Flush.Frequency = config.Config.RecorderKafkaFlushFrequency
cfg.Version = mustParseKafkaVersion(config.Config.RecorderKafkaVersion)
brokerList := strings.Split(config.Config.RecorderKafkaBrokers, ",")
producer, err := saramaNewAsyncProducer(brokerList, cfg)
if err != nil {
logrus.WithField("kafka_error", err).Fatal("Failed to start Sarama producer:")
}
// We will just log to STDOUT if we're not able to produce messages.
if producer != nil {
go func() {
for err := range producer.Errors() {
logrus.WithField("kafka_error", err).Error("failed to write access log entry")
}
}()
}
var encryptor dataRecordEncryptor
if config.Config.RecorderKafkaEncrypted && config.Config.RecorderKafkaEncryptionKey != "" {
encryptor = newSimpleboxEncryptor(config.Config.RecorderKafkaEncryptionKey)
}
return &kafkaRecorder{
topic: config.Config.RecorderKafkaTopic,
partitionKeyEnabled: config.Config.RecorderKafkaPartitionKeyEnabled,
producer: producer,
options: DataRecordFrameOptions{
Encrypted: config.Config.RecorderKafkaEncrypted,
Encryptor: encryptor,
FrameOutputMode: config.Config.RecorderFrameOutputMode,
},
}
}
func createTLSConfiguration(certFile string, keyFile string, caFile string, verifySSL bool, simpleSSL bool) (t *tls.Config) {
if certFile != "" && keyFile != "" {
cert, err := tls.LoadX509KeyPair(certFile, keyFile)
if err != nil {
logrus.WithField("TLSConfigurationError", err).Panic(err)
}
t = &tls.Config{
Certificates: []tls.Certificate{cert},
InsecureSkipVerify: !verifySSL,
}
}
if simpleSSL {
t = &tls.Config{
InsecureSkipVerify: !verifySSL,
}
}
if caFile != "" && t != nil {
caCert, err := os.ReadFile(caFile)
if err != nil {
logrus.WithField("TLSConfigurationError", err).Panic(err)
}
caCertPool := x509.NewCertPool()
caCertPool.AppendCertsFromPEM(caCert)
t.RootCAs = caCertPool
}
// will be nil by default if nothing is provided
return t
}
type kafkaRecorder struct {
producer sarama.AsyncProducer
topic string
options DataRecordFrameOptions
partitionKeyEnabled bool
}
func (k *kafkaRecorder) NewDataRecordFrame(r models.EvalResult) DataRecordFrame {
return DataRecordFrame{
evalResult: r,
options: k.options,
}
}
func (k *kafkaRecorder) AsyncRecord(r models.EvalResult) {
frame := k.NewDataRecordFrame(r)
output, err := frame.Output()
if err != nil {
logrus.WithField("err", err).Error("failed to generate data record frame for kafka recorder")
return
}
var partitionKey sarama.Encoder = nil
if k.partitionKeyEnabled {
partitionKey = sarama.StringEncoder(frame.GetPartitionKey())
}
k.producer.Input() <- &sarama.ProducerMessage{
Topic: k.topic,
Key: partitionKey,
Value: sarama.ByteEncoder(output),
Timestamp: time.Now().UTC(),
}
logKafkaAsyncRecordToDatadog(r)
}
var logKafkaAsyncRecordToDatadog = func(r models.EvalResult) {
if config.Global.StatsdClient == nil {
return
}
config.Global.StatsdClient.Incr(
"data_recorder.kafka",
[]string{
fmt.Sprintf("FlagID:%d", util.SafeUint(r.FlagID)),
},
float64(1),
)
}