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kafka.go
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kafka.go
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// SPDX-License-Identifier: MIT OR Apache-2.0
package outputs
import (
"context"
"crypto/tls"
"crypto/x509"
"encoding/json"
"fmt"
"log"
"net"
"strings"
"time"
"github.com/DataDog/datadog-go/statsd"
"github.com/segmentio/kafka-go"
"github.com/segmentio/kafka-go/sasl/plain"
"github.com/segmentio/kafka-go/sasl/scram"
"github.com/falcosecurity/falcosidekick/types"
)
// NewKafkaClient returns a new output.Client for accessing the Apache Kafka.
func NewKafkaClient(config *types.Configuration, stats *types.Statistics, promStats *types.PromStatistics, statsdClient, dogstatsdClient *statsd.Client) (*Client, error) {
transport := &kafka.Transport{
Dial: (&net.Dialer{
Timeout: 3 * time.Second,
DualStack: true,
}).DialContext,
ClientID: config.Kafka.ClientID,
}
if config.Kafka.TLS {
caCertPool, err := x509.SystemCertPool()
if err != nil {
log.Printf("[ERROR] : Kafka - failed to initialize root CAs: %v", err)
}
transport.TLS = &tls.Config{
RootCAs: caCertPool,
MinVersion: tls.VersionTLS12,
}
}
var err error
if config.Kafka.SASL != "" {
saslMode := strings.ToUpper(config.Kafka.SASL)
switch {
case saslMode == "PLAIN":
transport.SASL = plain.Mechanism{
Username: config.Kafka.Username,
Password: config.Kafka.Password,
}
case strings.HasPrefix(saslMode, "SCRAM_"):
algo := strings.TrimPrefix(config.Kafka.SASL, "SCRAM_")
switch algo {
case "SHA256":
transport.SASL, err = scram.Mechanism(scram.SHA256, config.Kafka.Username, config.Kafka.Password)
case "SHA512":
transport.SASL, err = scram.Mechanism(scram.SHA512, config.Kafka.Username, config.Kafka.Password)
default:
err = fmt.Errorf("unsupported SASL SCRAM algorithm %q", algo)
}
if err != nil {
err = fmt.Errorf("failed to initialize SASL SCRAM %q: %w", algo, err)
}
default:
err = fmt.Errorf("unsupported SASL mode: %q", config.Kafka.SASL)
}
}
if err != nil {
log.Printf("[ERROR] : Kafka - %v\n", err)
return nil, err
}
kafkaWriter := &kafka.Writer{
Addr: kafka.TCP(strings.Split(config.Kafka.HostPort, ",")...),
Topic: config.Kafka.Topic,
Async: config.Kafka.Async,
Transport: transport,
AllowAutoTopicCreation: config.Kafka.TopicCreation,
}
switch strings.ToLower(config.Kafka.Balancer) {
case "crc32":
kafkaWriter.Balancer = kafka.CRC32Balancer{Consistent: true}
case "crc32_random":
kafkaWriter.Balancer = kafka.CRC32Balancer{Consistent: false}
case "murmur2":
kafkaWriter.Balancer = kafka.Murmur2Balancer{Consistent: true}
case "murmur2_random":
kafkaWriter.Balancer = kafka.Murmur2Balancer{Consistent: false}
case "least_bytes":
kafkaWriter.Balancer = &kafka.LeastBytes{}
case "round_robin":
kafkaWriter.Balancer = &kafka.RoundRobin{}
default:
log.Printf("[ERROR] : Kafka - unsupported balancer %q\n", config.Kafka.Balancer)
return nil, fmt.Errorf("unsupported balancer %q", config.Kafka.Balancer)
}
switch strings.ToUpper(config.Kafka.Compression) {
case "GZIP":
kafkaWriter.Compression = kafka.Gzip
case "SNAPPY":
kafkaWriter.Compression = kafka.Snappy
case "LZ4":
kafkaWriter.Compression = kafka.Lz4
case "ZSTD":
kafkaWriter.Compression = kafka.Zstd
case "NONE":
// leave as default, none
default:
log.Printf("[ERROR] : Kafka - unsupported compression %q\n", config.Kafka.Compression)
return nil, fmt.Errorf("unsupported compression %q", config.Kafka.Compression)
}
switch strings.ToUpper(config.Kafka.RequiredACKs) {
case "ALL":
kafkaWriter.RequiredAcks = kafka.RequireAll
case "ONE":
kafkaWriter.RequiredAcks = kafka.RequireOne
case "NONE":
kafkaWriter.RequiredAcks = kafka.RequireNone
default:
log.Printf("[ERROR] : Kafka - unsupported required ACKs %q\n", config.Kafka.RequiredACKs)
return nil, fmt.Errorf("unsupported required ACKs %q", config.Kafka.RequiredACKs)
}
client := &Client{
OutputType: "Kafka",
Config: config,
Stats: stats,
PromStats: promStats,
StatsdClient: statsdClient,
DogstatsdClient: dogstatsdClient,
KafkaProducer: kafkaWriter,
}
kafkaWriter.Completion = client.handleKafkaCompletion
return client, nil
}
// KafkaProduce sends a message to a Apach Kafka Topic
func (c *Client) KafkaProduce(falcopayload types.FalcoPayload) {
c.Stats.Kafka.Add(Total, 1)
falcoMsg, err := json.Marshal(falcopayload)
if err != nil {
c.incrKafkaErrorMetrics(1)
log.Printf("[ERROR] : Kafka - %v - %v\n", "failed to marshalling message", err.Error())
return
}
kafkaMsg := kafka.Message{
Value: falcoMsg,
}
// Errors are logged/captured via handleKafkaCompletion function, ignore here
err = c.KafkaProducer.WriteMessages(context.Background(), kafkaMsg)
if err != nil {
c.incrKafkaErrorMetrics(1)
log.Printf("[ERROR] : Kafka - %v\n", err.Error())
return
} else {
c.incrKafkaSuccessMetrics(1)
log.Printf("[INFO] : Kafka - Publish OK\n")
}
}
// handleKafkaCompletion is called when a message is produced
func (c *Client) handleKafkaCompletion(messages []kafka.Message, err error) {
if err != nil {
c.incrKafkaErrorMetrics(len(messages))
log.Printf("[ERROR] : Kafka (%d) - %v\n", len(messages), err)
} else {
c.incrKafkaSuccessMetrics(len(messages))
log.Printf("[INFO] : Kafka (%d) - Publish OK\n", len(messages))
}
}
// incrKafkaSuccessMetrics increments the error stats
func (c *Client) incrKafkaSuccessMetrics(add int) {
go c.CountMetric("outputs", int64(add), []string{"output:kafka", "status:ok"})
c.Stats.Kafka.Add(OK, int64(add))
c.PromStats.Outputs.With(map[string]string{"destination": "kafka", "status": OK}).Add(float64(add))
}
// incrKafkaErrorMetrics increments the error stats
func (c *Client) incrKafkaErrorMetrics(add int) {
go c.CountMetric(Outputs, int64(add), []string{"output:kafka", "status:error"})
c.Stats.Kafka.Add(Error, int64(add))
c.PromStats.Outputs.With(map[string]string{"destination": "kafka", "status": Error}).Add(float64(add))
}