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339 lines
9.7 KiB
339 lines
9.7 KiB
/*
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* MinIO Cloud Storage, (C) 2018 MinIO, Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package target
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import (
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"context"
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"crypto/tls"
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"crypto/x509"
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"encoding/json"
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"errors"
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"net"
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"net/url"
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"os"
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"path/filepath"
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"github.com/minio/minio/pkg/event"
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xnet "github.com/minio/minio/pkg/net"
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sarama "github.com/Shopify/sarama"
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saramatls "github.com/Shopify/sarama/tools/tls"
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)
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// Kafka input constants
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const (
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KafkaBrokers = "brokers"
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KafkaTopic = "topic"
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KafkaQueueDir = "queue_dir"
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KafkaQueueLimit = "queue_limit"
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KafkaTLS = "tls"
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KafkaTLSSkipVerify = "tls_skip_verify"
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KafkaTLSClientAuth = "tls_client_auth"
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KafkaSASL = "sasl"
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KafkaSASLUsername = "sasl_username"
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KafkaSASLPassword = "sasl_password"
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KafkaSASLMechanism = "sasl_mechanism"
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KafkaClientTLSCert = "client_tls_cert"
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KafkaClientTLSKey = "client_tls_key"
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KafkaVersion = "version"
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EnvKafkaEnable = "MINIO_NOTIFY_KAFKA_ENABLE"
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EnvKafkaBrokers = "MINIO_NOTIFY_KAFKA_BROKERS"
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EnvKafkaTopic = "MINIO_NOTIFY_KAFKA_TOPIC"
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EnvKafkaQueueDir = "MINIO_NOTIFY_KAFKA_QUEUE_DIR"
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EnvKafkaQueueLimit = "MINIO_NOTIFY_KAFKA_QUEUE_LIMIT"
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EnvKafkaTLS = "MINIO_NOTIFY_KAFKA_TLS"
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EnvKafkaTLSSkipVerify = "MINIO_NOTIFY_KAFKA_TLS_SKIP_VERIFY"
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EnvKafkaTLSClientAuth = "MINIO_NOTIFY_KAFKA_TLS_CLIENT_AUTH"
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EnvKafkaSASLEnable = "MINIO_NOTIFY_KAFKA_SASL"
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EnvKafkaSASLUsername = "MINIO_NOTIFY_KAFKA_SASL_USERNAME"
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EnvKafkaSASLPassword = "MINIO_NOTIFY_KAFKA_SASL_PASSWORD"
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EnvKafkaSASLMechanism = "MINIO_NOTIFY_KAFKA_SASL_MECHANISM"
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EnvKafkaClientTLSCert = "MINIO_NOTIFY_KAFKA_CLIENT_TLS_CERT"
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EnvKafkaClientTLSKey = "MINIO_NOTIFY_KAFKA_CLIENT_TLS_KEY"
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EnvKafkaVersion = "MINIO_NOTIFY_KAFKA_VERSION"
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)
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// KafkaArgs - Kafka target arguments.
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type KafkaArgs struct {
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Enable bool `json:"enable"`
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Brokers []xnet.Host `json:"brokers"`
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Topic string `json:"topic"`
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QueueDir string `json:"queueDir"`
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QueueLimit uint64 `json:"queueLimit"`
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Version string `json:"version"`
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TLS struct {
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Enable bool `json:"enable"`
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RootCAs *x509.CertPool `json:"-"`
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SkipVerify bool `json:"skipVerify"`
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ClientAuth tls.ClientAuthType `json:"clientAuth"`
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ClientTLSCert string `json:"clientTLSCert"`
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ClientTLSKey string `json:"clientTLSKey"`
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} `json:"tls"`
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SASL struct {
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Enable bool `json:"enable"`
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User string `json:"username"`
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Password string `json:"password"`
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Mechanism string `json:"mechanism"`
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} `json:"sasl"`
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}
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// Validate KafkaArgs fields
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func (k KafkaArgs) Validate() error {
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if !k.Enable {
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return nil
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}
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if len(k.Brokers) == 0 {
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return errors.New("no broker address found")
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}
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for _, b := range k.Brokers {
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if _, err := xnet.ParseHost(b.String()); err != nil {
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return err
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}
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}
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if k.QueueDir != "" {
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if !filepath.IsAbs(k.QueueDir) {
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return errors.New("queueDir path should be absolute")
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}
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}
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if k.Version != "" {
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if _, err := sarama.ParseKafkaVersion(k.Version); err != nil {
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return err
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}
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}
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return nil
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}
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// KafkaTarget - Kafka target.
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type KafkaTarget struct {
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id event.TargetID
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args KafkaArgs
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producer sarama.SyncProducer
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config *sarama.Config
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store Store
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loggerOnce func(ctx context.Context, err error, id interface{}, errKind ...interface{})
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}
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// ID - returns target ID.
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func (target *KafkaTarget) ID() event.TargetID {
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return target.id
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}
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// HasQueueStore - Checks if the queueStore has been configured for the target
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func (target *KafkaTarget) HasQueueStore() bool {
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return target.store != nil
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}
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// IsActive - Return true if target is up and active
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func (target *KafkaTarget) IsActive() (bool, error) {
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if !target.args.pingBrokers() {
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return false, errNotConnected
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}
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return true, nil
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}
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// Save - saves the events to the store which will be replayed when the Kafka connection is active.
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func (target *KafkaTarget) Save(eventData event.Event) error {
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if target.store != nil {
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return target.store.Put(eventData)
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}
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_, err := target.IsActive()
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if err != nil {
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return err
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}
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return target.send(eventData)
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}
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// send - sends an event to the kafka.
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func (target *KafkaTarget) send(eventData event.Event) error {
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if target.producer == nil {
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return errNotConnected
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}
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objectName, err := url.QueryUnescape(eventData.S3.Object.Key)
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if err != nil {
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return err
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}
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key := eventData.S3.Bucket.Name + "/" + objectName
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data, err := json.Marshal(event.Log{EventName: eventData.EventName, Key: key, Records: []event.Event{eventData}})
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if err != nil {
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return err
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}
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msg := sarama.ProducerMessage{
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Topic: target.args.Topic,
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Key: sarama.StringEncoder(key),
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Value: sarama.ByteEncoder(data),
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}
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_, _, err = target.producer.SendMessage(&msg)
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return err
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}
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// Send - reads an event from store and sends it to Kafka.
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func (target *KafkaTarget) Send(eventKey string) error {
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var err error
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_, err = target.IsActive()
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if err != nil {
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return err
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}
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if target.producer == nil {
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brokers := []string{}
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for _, broker := range target.args.Brokers {
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brokers = append(brokers, broker.String())
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}
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target.producer, err = sarama.NewSyncProducer(brokers, target.config)
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if err != nil {
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if err != sarama.ErrOutOfBrokers {
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return err
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}
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return errNotConnected
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}
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}
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eventData, eErr := target.store.Get(eventKey)
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if eErr != nil {
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// The last event key in a successful batch will be sent in the channel atmost once by the replayEvents()
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// Such events will not exist and wouldve been already been sent successfully.
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if os.IsNotExist(eErr) {
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return nil
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}
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return eErr
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}
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err = target.send(eventData)
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if err != nil {
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// Sarama opens the ciruit breaker after 3 consecutive connection failures.
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if err == sarama.ErrLeaderNotAvailable || err.Error() == "circuit breaker is open" {
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return errNotConnected
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}
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return err
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}
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// Delete the event from store.
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return target.store.Del(eventKey)
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}
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// Close - closes underneath kafka connection.
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func (target *KafkaTarget) Close() error {
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if target.producer != nil {
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return target.producer.Close()
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}
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return nil
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}
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// Check if atleast one broker in cluster is active
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func (k KafkaArgs) pingBrokers() bool {
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for _, broker := range k.Brokers {
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_, dErr := net.Dial("tcp", broker.String())
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if dErr == nil {
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return true
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}
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}
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return false
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}
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// NewKafkaTarget - creates new Kafka target with auth credentials.
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func NewKafkaTarget(id string, args KafkaArgs, doneCh <-chan struct{}, loggerOnce func(ctx context.Context, err error, id interface{}, kind ...interface{}), test bool) (*KafkaTarget, error) {
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config := sarama.NewConfig()
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target := &KafkaTarget{
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id: event.TargetID{ID: id, Name: "kafka"},
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args: args,
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loggerOnce: loggerOnce,
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}
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if args.Version != "" {
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kafkaVersion, err := sarama.ParseKafkaVersion(args.Version)
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if err != nil {
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target.loggerOnce(context.Background(), err, target.ID())
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return target, err
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}
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config.Version = kafkaVersion
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}
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config.Net.SASL.User = args.SASL.User
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config.Net.SASL.Password = args.SASL.Password
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if args.SASL.Mechanism == "sha512" {
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config.Net.SASL.SCRAMClientGeneratorFunc = func() sarama.SCRAMClient { return &XDGSCRAMClient{HashGeneratorFcn: KafkaSHA512} }
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config.Net.SASL.Mechanism = sarama.SASLMechanism(sarama.SASLTypeSCRAMSHA512)
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} else if args.SASL.Mechanism == "sha256" {
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config.Net.SASL.SCRAMClientGeneratorFunc = func() sarama.SCRAMClient { return &XDGSCRAMClient{HashGeneratorFcn: KafkaSHA256} }
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config.Net.SASL.Mechanism = sarama.SASLMechanism(sarama.SASLTypeSCRAMSHA256)
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} else {
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// default to PLAIN
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config.Net.SASL.Mechanism = sarama.SASLMechanism(sarama.SASLTypePlaintext)
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}
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config.Net.SASL.Enable = args.SASL.Enable
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tlsConfig, err := saramatls.NewConfig(args.TLS.ClientTLSCert, args.TLS.ClientTLSKey)
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if err != nil {
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target.loggerOnce(context.Background(), err, target.ID())
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return target, err
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}
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config.Net.TLS.Enable = args.TLS.Enable
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config.Net.TLS.Config = tlsConfig
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config.Net.TLS.Config.InsecureSkipVerify = args.TLS.SkipVerify
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config.Net.TLS.Config.ClientAuth = args.TLS.ClientAuth
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config.Net.TLS.Config.RootCAs = args.TLS.RootCAs
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config.Producer.RequiredAcks = sarama.WaitForAll
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config.Producer.Retry.Max = 10
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config.Producer.Return.Successes = true
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target.config = config
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brokers := []string{}
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for _, broker := range args.Brokers {
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brokers = append(brokers, broker.String())
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}
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var store Store
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if args.QueueDir != "" {
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queueDir := filepath.Join(args.QueueDir, storePrefix+"-kafka-"+id)
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store = NewQueueStore(queueDir, args.QueueLimit)
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if oErr := store.Open(); oErr != nil {
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target.loggerOnce(context.Background(), oErr, target.ID())
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return target, oErr
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}
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target.store = store
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}
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producer, err := sarama.NewSyncProducer(brokers, config)
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if err != nil {
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if store == nil || err != sarama.ErrOutOfBrokers {
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target.loggerOnce(context.Background(), err, target.ID())
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return target, err
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}
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}
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target.producer = producer
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if target.store != nil && !test {
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// Replays the events from the store.
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eventKeyCh := replayEvents(target.store, doneCh, target.loggerOnce, target.ID())
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// Start replaying events from the store.
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go sendEvents(target, eventKeyCh, doneCh, target.loggerOnce)
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}
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return target, nil
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}
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