/
kafka.go
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/
kafka.go
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// Copyright (c) 2015-2023 MinIO, Inc.
//
// This file is part of MinIO Object Storage stack
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program 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 Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
package target
import (
"context"
"crypto/tls"
"crypto/x509"
"encoding/json"
"errors"
"fmt"
"net/url"
"os"
"path/filepath"
"strings"
"time"
"github.com/minio/minio/internal/event"
"github.com/minio/minio/internal/logger"
"github.com/minio/minio/internal/once"
"github.com/minio/minio/internal/store"
xnet "github.com/minio/pkg/v2/net"
"github.com/IBM/sarama"
saramatls "github.com/IBM/sarama/tools/tls"
)
// Kafka input constants
const (
KafkaBrokers = "brokers"
KafkaTopic = "topic"
KafkaQueueDir = "queue_dir"
KafkaQueueLimit = "queue_limit"
KafkaTLS = "tls"
KafkaTLSSkipVerify = "tls_skip_verify"
KafkaTLSClientAuth = "tls_client_auth"
KafkaSASL = "sasl"
KafkaSASLUsername = "sasl_username"
KafkaSASLPassword = "sasl_password"
KafkaSASLMechanism = "sasl_mechanism"
KafkaClientTLSCert = "client_tls_cert"
KafkaClientTLSKey = "client_tls_key"
KafkaVersion = "version"
KafkaBatchSize = "batch_size"
KafkaCompressionCodec = "compression_codec"
KafkaCompressionLevel = "compression_level"
EnvKafkaEnable = "MINIO_NOTIFY_KAFKA_ENABLE"
EnvKafkaBrokers = "MINIO_NOTIFY_KAFKA_BROKERS"
EnvKafkaTopic = "MINIO_NOTIFY_KAFKA_TOPIC"
EnvKafkaQueueDir = "MINIO_NOTIFY_KAFKA_QUEUE_DIR"
EnvKafkaQueueLimit = "MINIO_NOTIFY_KAFKA_QUEUE_LIMIT"
EnvKafkaTLS = "MINIO_NOTIFY_KAFKA_TLS"
EnvKafkaTLSSkipVerify = "MINIO_NOTIFY_KAFKA_TLS_SKIP_VERIFY"
EnvKafkaTLSClientAuth = "MINIO_NOTIFY_KAFKA_TLS_CLIENT_AUTH"
EnvKafkaSASLEnable = "MINIO_NOTIFY_KAFKA_SASL"
EnvKafkaSASLUsername = "MINIO_NOTIFY_KAFKA_SASL_USERNAME"
EnvKafkaSASLPassword = "MINIO_NOTIFY_KAFKA_SASL_PASSWORD"
EnvKafkaSASLMechanism = "MINIO_NOTIFY_KAFKA_SASL_MECHANISM"
EnvKafkaClientTLSCert = "MINIO_NOTIFY_KAFKA_CLIENT_TLS_CERT"
EnvKafkaClientTLSKey = "MINIO_NOTIFY_KAFKA_CLIENT_TLS_KEY"
EnvKafkaVersion = "MINIO_NOTIFY_KAFKA_VERSION"
EnvKafkaBatchSize = "MINIO_NOTIFY_KAFKA_BATCH_SIZE"
EnvKafkaProducerCompressionCodec = "MINIO_NOTIFY_KAFKA_PRODUCER_COMPRESSION_CODEC"
EnvKafkaProducerCompressionLevel = "MINIO_NOTIFY_KAFKA_PRODUCER_COMPRESSION_LEVEL"
)
var codecs = map[string]sarama.CompressionCodec{
"none": sarama.CompressionNone,
"gzip": sarama.CompressionGZIP,
"snappy": sarama.CompressionSnappy,
"lz4": sarama.CompressionLZ4,
"zstd": sarama.CompressionZSTD,
}
// KafkaArgs - Kafka target arguments.
type KafkaArgs struct {
Enable bool `json:"enable"`
Brokers []xnet.Host `json:"brokers"`
Topic string `json:"topic"`
QueueDir string `json:"queueDir"`
QueueLimit uint64 `json:"queueLimit"`
Version string `json:"version"`
BatchSize uint32 `json:"batchSize"`
TLS struct {
Enable bool `json:"enable"`
RootCAs *x509.CertPool `json:"-"`
SkipVerify bool `json:"skipVerify"`
ClientAuth tls.ClientAuthType `json:"clientAuth"`
ClientTLSCert string `json:"clientTLSCert"`
ClientTLSKey string `json:"clientTLSKey"`
} `json:"tls"`
SASL struct {
Enable bool `json:"enable"`
User string `json:"username"`
Password string `json:"password"`
Mechanism string `json:"mechanism"`
} `json:"sasl"`
Producer struct {
Compression string `json:"compression"`
CompressionLevel int `json:"compressionLevel"`
} `json:"producer"`
}
// Validate KafkaArgs fields
func (k KafkaArgs) Validate() error {
if !k.Enable {
return nil
}
if len(k.Brokers) == 0 {
return errors.New("no broker address found")
}
for _, b := range k.Brokers {
if _, err := xnet.ParseHost(b.String()); err != nil {
return err
}
}
if k.QueueDir != "" {
if !filepath.IsAbs(k.QueueDir) {
return errors.New("queueDir path should be absolute")
}
}
if k.Version != "" {
if _, err := sarama.ParseKafkaVersion(k.Version); err != nil {
return err
}
}
if k.BatchSize > 1 {
if k.QueueDir == "" {
return errors.New("batch should be enabled only if queue dir is enabled")
}
}
return nil
}
// KafkaTarget - Kafka target.
type KafkaTarget struct {
initOnce once.Init
id event.TargetID
args KafkaArgs
client sarama.Client
producer sarama.SyncProducer
config *sarama.Config
store store.Store[event.Event]
batch *store.Batch[string, *sarama.ProducerMessage]
loggerOnce logger.LogOnce
quitCh chan struct{}
}
// ID - returns target ID.
func (target *KafkaTarget) ID() event.TargetID {
return target.id
}
// Name - returns the Name of the target.
func (target *KafkaTarget) Name() string {
return target.ID().String()
}
// Store returns any underlying store if set.
func (target *KafkaTarget) Store() event.TargetStore {
return target.store
}
// IsActive - Return true if target is up and active
func (target *KafkaTarget) IsActive() (bool, error) {
if err := target.init(); err != nil {
return false, err
}
return target.isActive()
}
func (target *KafkaTarget) isActive() (bool, error) {
// Refer https://github.com/IBM/sarama/issues/1341
brokers := target.client.Brokers()
if len(brokers) == 0 {
return false, store.ErrNotConnected
}
return true, nil
}
// Save - saves the events to the store which will be replayed when the Kafka connection is active.
func (target *KafkaTarget) Save(eventData event.Event) error {
if target.store != nil {
return target.store.Put(eventData)
}
if err := target.init(); err != nil {
return err
}
return target.send(eventData)
}
// send - sends an event to the kafka.
func (target *KafkaTarget) send(eventData event.Event) error {
if target.producer == nil {
return store.ErrNotConnected
}
msg, err := target.toProducerMessage(eventData)
if err != nil {
return err
}
_, _, err = target.producer.SendMessage(msg)
return err
}
// SendFromStore - reads an event from store and sends it to Kafka.
func (target *KafkaTarget) SendFromStore(key store.Key) error {
if err := target.init(); err != nil {
return err
}
// If batch is enabled, the event will be batched in memory
// and will be committed once the batch is full.
if target.batch != nil {
return target.addToBatch(key)
}
eventData, eErr := target.store.Get(key.Name)
if eErr != nil {
// The last event key in a successful batch will be sent in the channel atmost once by the replayEvents()
// Such events will not exist and wouldve been already been sent successfully.
if os.IsNotExist(eErr) {
return nil
}
return eErr
}
if err := target.send(eventData); err != nil {
if isKafkaConnErr(err) {
return store.ErrNotConnected
}
return err
}
// Delete the event from store.
return target.store.Del(key.Name)
}
func (target *KafkaTarget) addToBatch(key store.Key) error {
if target.batch.IsFull() {
if err := target.commitBatch(); err != nil {
return err
}
}
if _, ok := target.batch.GetByKey(key.Name); !ok {
eventData, err := target.store.Get(key.Name)
if err != nil {
if os.IsNotExist(err) {
return nil
}
return err
}
msg, err := target.toProducerMessage(eventData)
if err != nil {
return err
}
if err = target.batch.Add(key.Name, msg); err != nil {
return err
}
}
// commit the batch if the key is the last one present in the store.
if key.IsLast || target.batch.IsFull() {
return target.commitBatch()
}
return nil
}
func (target *KafkaTarget) commitBatch() error {
keys, msgs, err := target.batch.GetAll()
if err != nil {
return err
}
if err = target.producer.SendMessages(msgs); err != nil {
if isKafkaConnErr(err) {
return store.ErrNotConnected
}
return err
}
return target.store.DelList(keys)
}
func (target *KafkaTarget) toProducerMessage(eventData event.Event) (*sarama.ProducerMessage, error) {
objectName, err := url.QueryUnescape(eventData.S3.Object.Key)
if err != nil {
return nil, err
}
key := eventData.S3.Bucket.Name + "/" + objectName
data, err := json.Marshal(event.Log{EventName: eventData.EventName, Key: key, Records: []event.Event{eventData}})
if err != nil {
return nil, err
}
return &sarama.ProducerMessage{
Topic: target.args.Topic,
Key: sarama.StringEncoder(key),
Value: sarama.ByteEncoder(data),
}, nil
}
// Close - closes underneath kafka connection.
func (target *KafkaTarget) Close() error {
close(target.quitCh)
if target.producer != nil {
target.producer.Close()
return target.client.Close()
}
return nil
}
func (target *KafkaTarget) init() error {
return target.initOnce.Do(target.initKafka)
}
func (target *KafkaTarget) initKafka() error {
args := target.args
config := sarama.NewConfig()
if args.Version != "" {
kafkaVersion, err := sarama.ParseKafkaVersion(args.Version)
if err != nil {
target.loggerOnce(context.Background(), err, target.ID().String())
return err
}
config.Version = kafkaVersion
}
config.Net.KeepAlive = 60 * time.Second
config.Net.SASL.User = args.SASL.User
config.Net.SASL.Password = args.SASL.Password
initScramClient(args, config) // initializes configured scram client.
config.Net.SASL.Enable = args.SASL.Enable
tlsConfig, err := saramatls.NewConfig(args.TLS.ClientTLSCert, args.TLS.ClientTLSKey)
if err != nil {
target.loggerOnce(context.Background(), err, target.ID().String())
return err
}
config.Net.TLS.Enable = args.TLS.Enable
config.Net.TLS.Config = tlsConfig
config.Net.TLS.Config.InsecureSkipVerify = args.TLS.SkipVerify
config.Net.TLS.Config.ClientAuth = args.TLS.ClientAuth
config.Net.TLS.Config.RootCAs = args.TLS.RootCAs
// These settings are needed to ensure that kafka client doesn't hang on brokers
// refer https://github.com/IBM/sarama/issues/765#issuecomment-254333355
config.Producer.Retry.Max = 2
config.Producer.Retry.Backoff = (1 * time.Second)
config.Producer.Return.Successes = true
config.Producer.Return.Errors = true
config.Producer.RequiredAcks = 1
config.Producer.Timeout = (5 * time.Second)
// Set Producer Compression
cc, ok := codecs[strings.ToLower(args.Producer.Compression)]
if ok {
config.Producer.Compression = cc
config.Producer.CompressionLevel = args.Producer.CompressionLevel
}
config.Net.ReadTimeout = (5 * time.Second)
config.Net.DialTimeout = (5 * time.Second)
config.Net.WriteTimeout = (5 * time.Second)
config.Metadata.Retry.Max = 1
config.Metadata.Retry.Backoff = (1 * time.Second)
config.Metadata.RefreshFrequency = (15 * time.Minute)
target.config = config
brokers := []string{}
for _, broker := range args.Brokers {
brokers = append(brokers, broker.String())
}
client, err := sarama.NewClient(brokers, config)
if err != nil {
if !errors.Is(err, sarama.ErrOutOfBrokers) {
target.loggerOnce(context.Background(), err, target.ID().String())
}
return err
}
producer, err := sarama.NewSyncProducerFromClient(client)
if err != nil {
if !errors.Is(err, sarama.ErrOutOfBrokers) {
target.loggerOnce(context.Background(), err, target.ID().String())
}
return err
}
target.client = client
target.producer = producer
yes, err := target.isActive()
if err != nil {
return err
}
if !yes {
return store.ErrNotConnected
}
return nil
}
// NewKafkaTarget - creates new Kafka target with auth credentials.
func NewKafkaTarget(id string, args KafkaArgs, loggerOnce logger.LogOnce) (*KafkaTarget, error) {
var queueStore store.Store[event.Event]
if args.QueueDir != "" {
queueDir := filepath.Join(args.QueueDir, storePrefix+"-kafka-"+id)
queueStore = store.NewQueueStore[event.Event](queueDir, args.QueueLimit, event.StoreExtension)
if err := queueStore.Open(); err != nil {
return nil, fmt.Errorf("unable to initialize the queue store of Kafka `%s`: %w", id, err)
}
}
target := &KafkaTarget{
id: event.TargetID{ID: id, Name: "kafka"},
args: args,
store: queueStore,
loggerOnce: loggerOnce,
quitCh: make(chan struct{}),
}
if target.store != nil {
if args.BatchSize > 1 {
target.batch = store.NewBatch[string, *sarama.ProducerMessage](args.BatchSize)
}
store.StreamItems(target.store, target, target.quitCh, target.loggerOnce)
}
return target, nil
}
func isKafkaConnErr(err error) bool {
// Sarama opens the circuit breaker after 3 consecutive connection failures.
return err == sarama.ErrLeaderNotAvailable || err.Error() == "circuit breaker is open"
}