/
trigger.go
386 lines (347 loc) · 12.2 KB
/
trigger.go
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package kafkasub
import (
"context"
"crypto/tls"
"crypto/x509"
"fmt"
"io/ioutil"
"os"
"os/signal"
"strconv"
"strings"
"time"
"github.com/Shopify/sarama"
"github.com/TIBCOSoftware/flogo-lib/core/trigger"
"github.com/TIBCOSoftware/flogo-lib/logger"
)
// log is the default package logger
var log = logger.GetLogger("trigger-flogo-kafkasub")
type _topichandler struct {
topic string
offset int64
group string
partitions []int32
}
type _kafkaParms struct {
brokers []string
handlers []_topichandler
}
// MqttTrigger is simple MQTT trigger
type KafkaSubTrigger struct {
metadata *trigger.Metadata
config *trigger.Config
handlers []*trigger.Handler
kafkaParms _kafkaParms
shutdownChan *chan struct{}
signals *chan os.Signal
kafkaConfig *sarama.Config
kafkaConsumer *sarama.Consumer
partitionConsumers *map[string]sarama.PartitionConsumer
}
//NewFactory create a new Trigger factory
func NewFactory(md *trigger.Metadata) trigger.Factory {
return &KafkasubFactory{metadata: md}
}
// KafkasubFactory Kafka subscriber Trigger factory
type KafkasubFactory struct {
metadata *trigger.Metadata
}
//New Creates a new trigger instance for a given id
func (t *KafkasubFactory) New(config *trigger.Config) trigger.Trigger {
kafkaTrigger := &KafkaSubTrigger{metadata: t.metadata, config: config}
kafkaTrigger.kafkaConfig = sarama.NewConfig()
kafkaTrigger.kafkaConfig.Consumer.Return.Errors = true
//err := initKafkaParams(kafkaTrigger)
//if err != nil {
// panic(fmt.Errorf("Failed to initialize parms: [%s]", err))
//}
return kafkaTrigger
}
// Metadata implements trigger.Trigger.Metadata
func (t *KafkaSubTrigger) Metadata() *trigger.Metadata {
return t.metadata
}
// Initialize implements trigger.Init
func (t *KafkaSubTrigger) Initialize(ctx trigger.InitContext) error {
t.handlers = ctx.GetHandlers()
err := initKafkaParams(t)
return err
}
// Start implements ext.Trigger.Start
func (t *KafkaSubTrigger) Start() error {
shutdownChan := make(chan struct{})
t.shutdownChan = &shutdownChan
signals := make(chan os.Signal, 1)
t.signals = &signals
signal.Notify(*t.signals, os.Interrupt)
err := run(t)
//log.Debug("KafkaSubTrigger Started")
return err
}
// Stop implements ext.Trigger.Stop
func (t *KafkaSubTrigger) Stop() error {
//unsubscribe from topic
if t.partitionConsumers == nil {
log.Debug("Closed called for a subscriber with no running consumers")
log.Debug("Stopped")
return nil
}
for id, partitionConsumer := range *t.partitionConsumers {
partitionConsumer.Close()
log.Debug("Closed partition consumer:", id)
}
if t.kafkaConsumer != nil {
(*t.kafkaConsumer).Close()
log.Debug("Closed kafka consumer")
}
log.Debug("Stopped")
return nil
}
func run(t *KafkaSubTrigger) error {
kafkaConsumer, err := sarama.NewConsumer(t.kafkaParms.brokers, t.kafkaConfig)
if err != nil {
return fmt.Errorf("failed to create Kafka consumer for reason [%s]", err)
}
t.kafkaConsumer = &kafkaConsumer
consumers := make(map[string]sarama.PartitionConsumer)
t.partitionConsumers = &consumers
for id, handler := range t.kafkaParms.handlers {
validPartitions, err := kafkaConsumer.Partitions(handler.topic)
if err != nil {
return fmt.Errorf("failed to get valid partitions for topic [%s] for reason [%s]. Aborting subscriber",
handler.topic, err)
}
log.Debugf("Subscribing to topic [%s]", handler.topic)
log.Debugf("Valid partitions for topic [%s] detected as: [%v]", handler.topic, validPartitions)
if handler.partitions == nil { //subscribe to all valid partitions
handler.partitions = validPartitions
for _, part := range validPartitions {
startConsumer(t, part, id)
}
} else { //subscribe to a subset of valid partitions
configPartitions := handler.partitions
for _, confPart := range configPartitions {
for _, valPart := range validPartitions {
if confPart == valPart {
startConsumer(t, confPart, id)
break
}
log.Errorf("Configured partition [%d] on topic [%s] does not exist and will not be subscribed", confPart, handler.topic)
}
}
}
if len(*t.partitionConsumers) < 1 {
return fmt.Errorf("Kafka consumer is not configured for any valid partitions")
}
log.Debugf("Kafka consumers for topic [%s] started", handler.topic)
}
return nil
}
func startConsumer(t *KafkaSubTrigger, part int32, id int) error {
log.Debugf("Creating PartitionConsumer for valid partition: [%s:%d]", t.kafkaParms.handlers[id].topic, part)
consumer := *t.kafkaConsumer
partitionConsumer, err := consumer.ConsumePartition(t.kafkaParms.handlers[id].topic, part, t.kafkaParms.handlers[id].offset)
if err != nil {
log.Errorf("Creating PartitionConsumer for valid partition: [%s:%d] failed for reason: %s", t.kafkaParms.handlers[id].topic, part, err)
return err
}
consumerName := fmt.Sprintf("%d_%d", part, id)
(*t.partitionConsumers)[consumerName] = partitionConsumer
go consumePartition(t, partitionConsumer, part)
return nil
}
func consumePartition(t *KafkaSubTrigger, consumer sarama.PartitionConsumer, part int32) {
for {
select {
case err := <-consumer.Errors():
if err == nil {
//been shutdown
return
}
log.Warnf("PartitionConsumer [%d] got error: [%s]", part, err)
time.Sleep(time.Millisecond * 300)
case msg := <-consumer.Messages():
onMessage(t, msg)
case <-*t.signals:
log.Infof("Partition consumer got SIGINT; exiting")
*t.shutdownChan <- struct{}{}
return
case <-*t.shutdownChan:
log.Infof("Partition consumer got SHUTDOWN signal; exiting")
return
}
}
}
func getTopics(t *KafkaSubTrigger) []string {
return strings.Split(t.config.Settings["Topics"].(string), ",")
}
func initKafkaParams(t *KafkaSubTrigger) error {
brokersString := t.config.Settings["BrokerUrl"]
if brokersString == nil || brokersString.(string) == "" {
return fmt.Errorf("BrokerUrl not provided")
}
brokers := strings.Split(brokersString.(string), ",")
if len(brokers) < 1 {
return fmt.Errorf("BrokerUrl [%s] is invalid, require at least one broker", brokersString.(string))
}
t.kafkaParms.brokers = make([]string, len(brokers))
for brokerNo, broker := range brokers {
err := validateBrokerUrl(broker)
if err != nil {
return fmt.Errorf("BrokerUrl [%s] format invalid for reason: [%s]", broker, err.Error())
}
t.kafkaParms.brokers[brokerNo] = broker
}
//clientKeystore
/*
Its worth mentioning here that when the keystore for kafka is created it must support RSA keys via
the -keyalg RSA option. If not then there will be ZERO overlap in supported cipher suites with java.
see: https://issues.apache.org/jira/browse/KAFKA-3647
for more info
*/
if trustStore := t.config.Settings["truststore"]; trustStore != nil &&
len(trustStore.(string)) > 0 {
trustPool, err := getCerts(trustStore.(string))
if err != nil {
return err
}
config := tls.Config{
RootCAs: trustPool,
InsecureSkipVerify: true}
t.kafkaConfig.Net.TLS.Enable = true
t.kafkaConfig.Net.TLS.Config = &config
}
// SASL
if t.config.Settings["user"] != nil {
var password string
user := t.config.Settings["user"].(string)
if len(user) > 0 {
if t.config.Settings["password"] == nil ||
len(t.config.Settings["password"].(string)) < 1 {
return fmt.Errorf("password not provided for user: %s", user)
}
password = t.config.Settings["password"].(string)
t.kafkaConfig.Net.SASL.Enable = true
t.kafkaConfig.Net.SASL.User = user
t.kafkaConfig.Net.SASL.Password = password
}
}
// _topichandlers section
if len(t.handlers) == 0 {
return fmt.Errorf("Kafka trigger requires at least one handler containing a valid topic name")
}
t.kafkaParms.handlers = make([]_topichandler, len(t.handlers))
for handlerNum, handler := range t.handlers {
if handler.GetStringSetting("Topic") == "" {
return fmt.Errorf("topic string was not provided for handler: [%s]", handler)
}
t.kafkaParms.handlers[handlerNum].topic = handler.GetStringSetting("Topic")
//offset
if handler.GetStringSetting("offset") != "" {
i, err := strconv.Atoi(handler.GetStringSetting("offset"))
if err != nil {
log.Warnf("Offset [%s] specified for handler [%s] is not a valid number, using latest for offset",
handler.GetStringSetting("offset"), handler)
t.kafkaParms.handlers[handlerNum].offset = sarama.OffsetNewest
} else {
t.kafkaParms.handlers[handlerNum].offset = int64(i)
}
} else {
t.kafkaParms.handlers[handlerNum].offset = sarama.OffsetNewest
}
//partitions
if handler.GetStringSetting("partitions") != "" {
partitions := handler.GetStringSetting("partitions")
i := 0
parts := strings.Split(partitions, ",")
t.kafkaParms.handlers[handlerNum].partitions = make([]int32, len(parts))
for _, p := range parts {
n, err := strconv.Atoi(p)
if err == nil {
t.kafkaParms.handlers[handlerNum].partitions[i] = int32(n)
i++
} else {
log.Warnf("Partition [%s] specified for handler [%s] is not a valid number and is discarded",
p, handler)
}
}
}
//group
if handler.GetStringSetting("group") != "" {
t.kafkaParms.handlers[handlerNum].group = handler.GetStringSetting("group")
}
}
return nil
}
func getCerts(trustStore string) (*x509.CertPool, error) {
certPool := x509.NewCertPool()
fileInfo, err := os.Stat(trustStore)
if err != nil {
return certPool, fmt.Errorf("Truststore [%s] does not exist", trustStore)
}
switch mode := fileInfo.Mode(); {
case mode.IsDir():
break
case mode.IsRegular():
return certPool, fmt.Errorf("Truststore [%s] is not a directory. Must be a directory containing trusted certificates in PEM format",
trustStore)
}
trustedCertFiles, err := ioutil.ReadDir(trustStore)
if err != nil || len(trustedCertFiles) == 0 {
return certPool, fmt.Errorf("Failed to read trusted certificates from [%s] Must be a directory containing trusted certificates in PEM format", trustStore)
}
for _, trustCertFile := range trustedCertFiles {
fqfName := fmt.Sprintf("%s%c%s", trustStore, os.PathSeparator, trustCertFile.Name())
trustCertBytes, err := ioutil.ReadFile(fqfName)
if err != nil {
log.Warnf("Failed to read trusted certificate [%s] ... continueing", trustCertFile.Name())
}
certPool.AppendCertsFromPEM(trustCertBytes)
}
if len(certPool.Subjects()) < 1 {
return certPool, fmt.Errorf("Failed to read trusted certificates from [%s] After processing all files in the directory no valid trusted certs were found", trustStore)
}
return certPool, nil
}
//Ensure that this string meets the host:port definition of a kafka hostspec
//Kafka calls it a url but its really just host:port, which for numeric ip addresses is not a valid URI
//technically speaking.
func validateBrokerUrl(broker string) error {
hostport := strings.Split(broker, ":")
if len(hostport) != 2 {
return fmt.Errorf("BrokerUrl must be composed of sections like \"host:port\"")
}
i, err := strconv.Atoi(hostport[1])
if err != nil || i < 0 || i > 32767 {
return fmt.Errorf("Port specification [%s] is not numeric and between 0 and 32767", hostport[1])
}
return nil
}
func onMessage(t *KafkaSubTrigger, msg *sarama.ConsumerMessage) {
if msg == nil {
return
}
log.Debugf("Kafka subscriber triggering job from topic [%s] on partition [%d] with key [%s] at offset [%d]",
msg.Topic, msg.Partition, msg.Key, msg.Offset)
for _, handler := range t.handlers {
//actionID := action.Get(handler.ActionId)
//log.Debugf("Found action: '%+x' for ActionID: %s", actionID, handler.ActionId)
if t.metadata == nil {
log.Infof("Kafka subscriber running in test mode received message on topic [%s] on partition [%d] with key [%s] at offset [%d]",
msg.Topic, msg.Partition, msg.Key, msg.Offset)
log.Infof("Content: [%s]", string(msg.Value))
return
}
data := make(map[string]interface{})
data["message"] = string(msg.Value)
//if(t.metadata.Metadata.OutPuts
startAttrs, errorAttrs := t.metadata.OutputsToAttrs(data, true)
if errorAttrs != nil || startAttrs == nil {
log.Errorf("Failed to create output attributes for kafka message for handler [%s] for reason [%s] message lost", handler, errorAttrs)
}
_, err := handler.Handle(context.Background(), data)
if err != nil {
log.Errorf("Run action for handler [%s] failed for reason [%s] message lost", handler, err)
}
}
}