frostfs-s3-gw/pkg/event/target/kafka.go

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/*
* MinIO Cloud Storage, (C) 2018 MinIO, Inc.
*
* 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 target
import (
"context"
"crypto/tls"
"crypto/x509"
"encoding/json"
"errors"
"net"
"net/url"
"os"
"path/filepath"
"github.com/minio/minio/pkg/event"
xnet "github.com/minio/minio/pkg/net"
sarama "github.com/Shopify/sarama"
saramatls "github.com/Shopify/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"
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"
)
// 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"`
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"`
}
// 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
}
}
return nil
}
// KafkaTarget - Kafka target.
type KafkaTarget struct {
id event.TargetID
args KafkaArgs
producer sarama.SyncProducer
config *sarama.Config
store Store
loggerOnce func(ctx context.Context, err error, id interface{}, errKind ...interface{})
}
// ID - returns target ID.
func (target *KafkaTarget) ID() event.TargetID {
return target.id
}
// HasQueueStore - Checks if the queueStore has been configured for the target
func (target *KafkaTarget) HasQueueStore() bool {
return target.store != nil
}
// IsActive - Return true if target is up and active
func (target *KafkaTarget) IsActive() (bool, error) {
if !target.args.pingBrokers() {
return false, 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)
}
_, err := target.IsActive()
if err != nil {
return err
}
return target.send(eventData)
}
// send - sends an event to the kafka.
func (target *KafkaTarget) send(eventData event.Event) error {
objectName, err := url.QueryUnescape(eventData.S3.Object.Key)
if err != nil {
return 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 err
}
msg := sarama.ProducerMessage{
Topic: target.args.Topic,
Key: sarama.StringEncoder(key),
Value: sarama.ByteEncoder(data),
}
_, _, err = target.producer.SendMessage(&msg)
return err
}
// Send - reads an event from store and sends it to Kafka.
func (target *KafkaTarget) Send(eventKey string) error {
var err error
_, err = target.IsActive()
if err != nil {
return err
}
if target.producer == nil {
brokers := []string{}
for _, broker := range target.args.Brokers {
brokers = append(brokers, broker.String())
}
target.producer, err = sarama.NewSyncProducer(brokers, target.config)
if err != nil {
if err != sarama.ErrOutOfBrokers {
return err
}
return errNotConnected
}
}
eventData, eErr := target.store.Get(eventKey)
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
}
err = target.send(eventData)
if err != nil {
// Sarama opens the ciruit breaker after 3 consecutive connection failures.
if err == sarama.ErrLeaderNotAvailable || err.Error() == "circuit breaker is open" {
return errNotConnected
}
return err
}
// Delete the event from store.
return target.store.Del(eventKey)
}
// Close - closes underneath kafka connection.
func (target *KafkaTarget) Close() error {
if target.producer != nil {
return target.producer.Close()
}
return nil
}
// Check if atleast one broker in cluster is active
func (k KafkaArgs) pingBrokers() bool {
for _, broker := range k.Brokers {
_, dErr := net.Dial("tcp", broker.String())
if dErr == nil {
return true
}
}
return false
}
// NewKafkaTarget - creates new Kafka target with auth credentials.
func NewKafkaTarget(id string, args KafkaArgs, doneCh <-chan struct{}, loggerOnce func(ctx context.Context, err error, id interface{}, kind ...interface{}), test bool) (*KafkaTarget, error) {
config := sarama.NewConfig()
target := &KafkaTarget{
id: event.TargetID{ID: id, Name: "kafka"},
args: args,
loggerOnce: loggerOnce,
}
if args.Version != "" {
kafkaVersion, err := sarama.ParseKafkaVersion(args.Version)
if err != nil {
target.loggerOnce(context.Background(), err, target.ID())
return target, err
}
config.Version = kafkaVersion
}
config.Net.SASL.User = args.SASL.User
config.Net.SASL.Password = args.SASL.Password
if args.SASL.Mechanism == "sha512" {
config.Net.SASL.SCRAMClientGeneratorFunc = func() sarama.SCRAMClient { return &XDGSCRAMClient{HashGeneratorFcn: KafkaSHA512} }
config.Net.SASL.Mechanism = sarama.SASLMechanism(sarama.SASLTypeSCRAMSHA512)
} else if args.SASL.Mechanism == "sha256" {
config.Net.SASL.SCRAMClientGeneratorFunc = func() sarama.SCRAMClient { return &XDGSCRAMClient{HashGeneratorFcn: KafkaSHA256} }
config.Net.SASL.Mechanism = sarama.SASLMechanism(sarama.SASLTypeSCRAMSHA256)
} else {
// default to PLAIN
config.Net.SASL.Mechanism = sarama.SASLMechanism(sarama.SASLTypePlaintext)
}
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())
return target, 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
config.Producer.RequiredAcks = sarama.WaitForAll
config.Producer.Retry.Max = 10
config.Producer.Return.Successes = true
target.config = config
brokers := []string{}
for _, broker := range args.Brokers {
brokers = append(brokers, broker.String())
}
var store Store
if args.QueueDir != "" {
queueDir := filepath.Join(args.QueueDir, storePrefix+"-kafka-"+id)
store = NewQueueStore(queueDir, args.QueueLimit)
if oErr := store.Open(); oErr != nil {
target.loggerOnce(context.Background(), oErr, target.ID())
return target, oErr
}
target.store = store
}
producer, err := sarama.NewSyncProducer(brokers, config)
if err != nil {
if store == nil || err != sarama.ErrOutOfBrokers {
target.loggerOnce(context.Background(), err, target.ID())
return target, err
}
}
target.producer = producer
if target.store != nil && !test {
// Replays the events from the store.
eventKeyCh := replayEvents(target.store, doneCh, target.loggerOnce, target.ID())
// Start replaying events from the store.
go sendEvents(target, eventKeyCh, doneCh, target.loggerOnce)
}
return target, nil
}