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kafka.go
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kafka.go
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/*
Copyright 2016 The Fission Authors.
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 kafka
import (
"context"
"crypto/tls"
"crypto/x509"
"os"
"regexp"
"strconv"
"strings"
"github.com/Shopify/sarama"
"github.com/pkg/errors"
"go.uber.org/zap"
fv1 "github.com/fission/fission/pkg/apis/core/v1"
"github.com/fission/fission/pkg/mqtrigger/factory"
"github.com/fission/fission/pkg/mqtrigger/messageQueue"
"github.com/fission/fission/pkg/mqtrigger/validator"
)
func init() {
factory.Register(fv1.MessageQueueTypeKafka, &Factory{})
validator.Register(fv1.MessageQueueTypeKafka, IsTopicValid)
}
var (
// Need to use raw string to support escape sequence for - & . chars
validKafkaTopicName = regexp.MustCompile(`^[a-zA-Z0-9][a-zA-Z0-9\-\._]*[a-zA-Z0-9]$`)
// Map for ErrorTopic messages to maintain recycle counter
errorMessageMap = make(map[string]int)
)
type (
Kafka struct {
logger *zap.Logger
routerUrl string
brokers []string
version sarama.KafkaVersion
client sarama.Client
authKeys map[string][]byte
tls bool
}
Factory struct{}
)
type MqtConsumer struct {
ctx context.Context
cancel context.CancelFunc
consumer sarama.ConsumerGroup
}
func (factory *Factory) Create(logger *zap.Logger, mqCfg messageQueue.Config, routerUrl string) (messageQueue.MessageQueue, error) {
return New(logger, mqCfg, routerUrl)
}
func New(logger *zap.Logger, mqCfg messageQueue.Config, routerUrl string) (messageQueue.MessageQueue, error) {
if len(routerUrl) == 0 || len(mqCfg.Url) == 0 {
return nil, errors.New("the router URL or MQ URL is empty")
}
mqKafkaVersion := os.Getenv("MESSAGE_QUEUE_KAFKA_VERSION")
// Parse version string
kafkaVersion, err := sarama.ParseKafkaVersion(mqKafkaVersion)
if err != nil {
logger.Warn("error parsing kafka version string - falling back to default",
zap.Error(err),
zap.String("failed_version", mqKafkaVersion),
zap.Any("default_version", kafkaVersion))
}
kafka := Kafka{
logger: logger.Named("kafka"),
routerUrl: routerUrl,
brokers: strings.Split(mqCfg.Url, ","),
version: kafkaVersion,
}
if tls, _ := strconv.ParseBool(os.Getenv("TLS_ENABLED")); tls {
kafka.tls = true
authKeys := make(map[string][]byte)
if mqCfg.Secrets == nil {
return nil, errors.New("no secrets were loaded")
}
authKeys["caCert"] = mqCfg.Secrets["caCert"]
authKeys["userCert"] = mqCfg.Secrets["userCert"]
authKeys["userKey"] = mqCfg.Secrets["userKey"]
kafka.authKeys = authKeys
}
logger.Info("created kafka queue", zap.Any("kafka brokers", kafka.brokers),
zap.Any("kafka version", kafka.version))
// Create new config
saramaConfig := sarama.NewConfig()
saramaConfig.Version = kafka.version
// consumer config
saramaConfig.Consumer.Return.Errors = true
// producer config
saramaConfig.Producer.RequiredAcks = sarama.WaitForAll
saramaConfig.Producer.Retry.Max = 10
saramaConfig.Producer.Return.Successes = true
// Setup TLS for both producer and consumer
if kafka.tls {
tlsConfig, err := kafka.getTLSConfig()
if err != nil {
return nil, err
}
saramaConfig.Net.TLS.Enable = true
saramaConfig.Net.TLS.Config = tlsConfig
}
saramaClient, err := sarama.NewClient(kafka.brokers, saramaConfig)
if err != nil {
return nil, err
}
kafka.client = saramaClient
return kafka, nil
}
func (kafka Kafka) Subscribe(trigger *fv1.MessageQueueTrigger) (messageQueue.Subscription, error) {
kafka.logger.Debug("inside kakfa subscribe", zap.Any("trigger", trigger))
kafka.logger.Debug("brokers set", zap.Strings("brokers", kafka.brokers))
consumer, err := sarama.NewConsumerGroupFromClient(string(trigger.ObjectMeta.UID), kafka.client)
if err != nil {
return nil, err
}
producer, err := sarama.NewSyncProducerFromClient(kafka.client)
if err != nil {
return nil, err
}
kafka.logger.Info("created a new producer and a new consumer", zap.Strings("brokers", kafka.brokers),
zap.String("topic", trigger.Spec.Topic),
zap.String("response topic", trigger.Spec.ResponseTopic),
zap.String("error topic", trigger.Spec.ErrorTopic),
zap.String("trigger", trigger.ObjectMeta.Name),
zap.String("function namespace", trigger.ObjectMeta.Namespace),
zap.String("function name", trigger.Spec.FunctionReference.Name))
// consume errors
go func() {
for err := range consumer.Errors() {
kafka.logger.With(zap.String("trigger", trigger.ObjectMeta.Name), zap.String("topic", trigger.Spec.Topic)).Error("consumer error received", zap.Error(err))
}
}()
ctx, cancel := context.WithCancel(context.Background())
ch := NewMqtConsumerGroupHandler(kafka.version, kafka.logger, trigger, producer, kafka.routerUrl)
// consume messages
go func() {
topic := []string{trigger.Spec.Topic}
// Create a new session for the consumer group until the context is cancelled
for {
// Consume messages
err := consumer.Consume(ctx, topic, ch)
if err != nil {
kafka.logger.Error("consumer error", zap.Error(err), zap.String("trigger", trigger.ObjectMeta.Name))
}
if ctx.Err() != nil {
kafka.logger.Info("consumer context cancelled", zap.String("trigger", trigger.ObjectMeta.Name))
return
}
ch.ready = make(chan bool)
}
}()
<-ch.ready // wait for consumer to be ready
mqtConsumer := MqtConsumer{
ctx: ctx,
cancel: cancel,
consumer: consumer,
}
return mqtConsumer, nil
}
func (kafka Kafka) getTLSConfig() (*tls.Config, error) {
tlsConfig := tls.Config{}
cert, err := tls.X509KeyPair(kafka.authKeys["userCert"], kafka.authKeys["userKey"])
if err != nil {
return nil, err
}
tlsConfig.Certificates = []tls.Certificate{cert}
skipVerify, err := strconv.ParseBool(os.Getenv("INSECURE_SKIP_VERIFY"))
if err != nil {
kafka.logger.Error("failed to parse value of env variable INSECURE_SKIP_VERIFY taking default value false, expected boolean value: true/false",
zap.String("received", os.Getenv("INSECURE_SKIP_VERIFY")))
} else {
tlsConfig.InsecureSkipVerify = skipVerify
}
caCertPool := x509.NewCertPool()
caCertPool.AppendCertsFromPEM(kafka.authKeys["caCert"])
tlsConfig.RootCAs = caCertPool
return &tlsConfig, nil
}
func (kafka Kafka) Unsubscribe(subscription messageQueue.Subscription) error {
mqtConsumer := subscription.(MqtConsumer)
mqtConsumer.cancel()
return mqtConsumer.consumer.Close()
}
// The validation is based on Kafka's internal implementation:
// https://github.com/apache/kafka/blob/cde6d18983b5d58199f8857d8d61d7efcbe6e54a/clients/src/main/java/org/apache/kafka/common/internals/Topic.java#L36-L47
func IsTopicValid(topic string) bool {
if len(topic) == 0 {
return false
}
if topic == "." || topic == ".." {
return false
}
if len(topic) > 249 {
return false
}
if !validKafkaTopicName.MatchString(topic) {
return false
}
return true
}