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minio/pkg/event/target/kafka.go

251 lines
6.2 KiB

/*
* 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 (
"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 "gopkg.in/Shopify/sarama.v1"
)
// 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"`
TLS struct {
Enable bool `json:"enable"`
RootCAs *x509.CertPool `json:"-"`
SkipVerify bool `json:"skipVerify"`
ClientAuth tls.ClientAuthType `json:"clientAuth"`
} `json:"tls"`
SASL struct {
Enable bool `json:"enable"`
User string `json:"username"`
Password string `json:"password"`
} `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.QueueLimit > 10000 {
return errors.New("queueLimit should not exceed 10000")
}
return nil
}
// KafkaTarget - Kafka target.
type KafkaTarget struct {
id event.TargetID
args KafkaArgs
producer sarama.SyncProducer
config *sarama.Config
store Store
}
// ID - returns target ID.
func (target *KafkaTarget) ID() event.TargetID {
return target.id
}
// 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 !target.args.pingBrokers() {
return errNotConnected
}
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
if !target.args.pingBrokers() {
return errNotConnected
}
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{}) (*KafkaTarget, error) {
config := sarama.NewConfig()
config.Net.SASL.User = args.SASL.User
config.Net.SASL.Password = args.SASL.Password
config.Net.SASL.Enable = args.SASL.Enable
config.Net.TLS.Enable = args.TLS.Enable
tlsConfig := &tls.Config{
ClientAuth: args.TLS.ClientAuth,
InsecureSkipVerify: args.TLS.SkipVerify,
RootCAs: args.TLS.RootCAs,
}
config.Net.TLS.Config = tlsConfig
config.Producer.RequiredAcks = sarama.WaitForAll
config.Producer.Retry.Max = 10
config.Producer.Return.Successes = true
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 {
return nil, oErr
}
}
producer, err := sarama.NewSyncProducer(brokers, config)
if err != nil {
if store == nil || err != sarama.ErrOutOfBrokers {
return nil, err
}
}
target := &KafkaTarget{
id: event.TargetID{ID: id, Name: "kafka"},
args: args,
producer: producer,
config: config,
store: store,
}
if target.store != nil {
// Replays the events from the store.
eventKeyCh := replayEvents(target.store, doneCh)
// Start replaying events from the store.
go sendEvents(target, eventKeyCh, doneCh)
}
return target, nil
}