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client.go
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client.go
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package kafka
import (
"encoding/json"
"expvar"
"sync"
"sync/atomic"
"time"
"github.com/Shopify/sarama"
"github.com/elastic/beats/libbeat/common"
"github.com/elastic/beats/libbeat/logp"
)
type client struct {
hosts []string
topic string
useType bool
config sarama.Config
producer sarama.AsyncProducer
wg sync.WaitGroup
isConnected int32
}
type msgRef struct {
count int32
batch []common.MapStr
cb func([]common.MapStr, error)
err error
}
var (
ackedEvents = expvar.NewInt("libbeatKafkaPublishedAndAckedEvents")
eventsNotAcked = expvar.NewInt("libbeatKafkaPublishedButNotAckedEvents")
publishEventsCallCount = expvar.NewInt("libbeatKafkaPublishEventsCallCount")
)
func newKafkaClient(hosts []string, topic string, useType bool, cfg *sarama.Config) (*client, error) {
c := &client{
hosts: hosts,
useType: useType,
topic: topic,
config: *cfg,
}
return c, nil
}
func (c *client) Connect(timeout time.Duration) error {
debugf("connect: %v", c.hosts)
c.config.Net.DialTimeout = timeout
// try to connect
producer, err := sarama.NewAsyncProducer(c.hosts, &c.config)
if err != nil {
logp.Err("Kafka connect fails with: %v", err)
return err
}
c.producer = producer
c.wg.Add(2)
go c.successWorker(producer.Successes())
go c.errorWorker(producer.Errors())
atomic.StoreInt32(&c.isConnected, 1)
return nil
}
func (c *client) Close() error {
if c.IsConnected() {
debugf("closed kafka client")
c.producer.AsyncClose()
c.wg.Wait()
atomic.StoreInt32(&c.isConnected, 0)
c.producer = nil
}
return nil
}
func (c *client) IsConnected() bool {
return atomic.LoadInt32(&c.isConnected) != 0
}
func (c *client) AsyncPublishEvent(
cb func(error),
event common.MapStr,
) error {
return c.AsyncPublishEvents(func(_ []common.MapStr, err error) {
cb(err)
}, []common.MapStr{event})
}
func (c *client) AsyncPublishEvents(
cb func([]common.MapStr, error),
events []common.MapStr,
) error {
publishEventsCallCount.Add(1)
debugf("publish events")
ref := &msgRef{
count: int32(len(events)),
batch: events,
cb: cb,
}
ch := c.producer.Input()
for _, event := range events {
topic := c.topic
if c.useType {
topic = event["type"].(string)
}
jsonEvent, err := json.Marshal(event)
if err != nil {
ref.done()
continue
}
msg := &sarama.ProducerMessage{
Metadata: ref,
Topic: topic,
Value: sarama.ByteEncoder(jsonEvent),
}
ch <- msg
}
return nil
}
func (c *client) successWorker(ch <-chan *sarama.ProducerMessage) {
defer c.wg.Done()
defer debugf("Stop kafka ack worker")
for msg := range ch {
ref := msg.Metadata.(*msgRef)
ref.done()
}
}
func (c *client) errorWorker(ch <-chan *sarama.ProducerError) {
defer c.wg.Done()
defer debugf("Stop kafka error handler")
for errMsg := range ch {
msg := errMsg.Msg
ref := msg.Metadata.(*msgRef)
ref.fail(errMsg.Err)
}
}
func (r *msgRef) done() {
r.dec()
}
func (r *msgRef) fail(err error) {
r.err = err
r.dec()
}
func (r *msgRef) dec() {
i := atomic.AddInt32(&r.count, -1)
if i > 0 {
return
}
debugf("finished kafka batch")
err := r.err
if err != nil {
eventsNotAcked.Add(int64(len(r.batch)))
debugf("Kafka publish failed with: %v", err)
r.cb(r.batch, err)
} else {
ackedEvents.Add(int64(len(r.batch)))
r.cb(nil, nil)
}
}