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kafka.go
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kafka.go
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package kafka
import (
"errors"
"fmt"
"strings"
"time"
"github.com/Shopify/sarama"
"github.com/urso/ucfg"
"github.com/rwdial/beats/libbeat/common"
"github.com/rwdial/beats/libbeat/logp"
"github.com/rwdial/beats/libbeat/outputs"
"github.com/rwdial/beats/libbeat/outputs/mode"
)
type kafka struct {
mode mode.ConnectionMode
}
func init() {
sarama.Logger = kafkaLogger{}
outputs.RegisterOutputPlugin("kafka", New)
}
var debugf = logp.MakeDebug("kafka")
var (
errNoTopicSet = errors.New("No topic configured")
errNoHosts = errors.New("No hosts configured")
)
var (
compressionModes = map[string]sarama.CompressionCodec{
"none": sarama.CompressionNone,
"no": sarama.CompressionNone,
"off": sarama.CompressionNone,
"gzip": sarama.CompressionGZIP,
"snappy": sarama.CompressionSnappy,
}
)
func New(cfg *ucfg.Config, topologyExpire int) (outputs.Outputer, error) {
output := &kafka{}
err := output.init(cfg)
if err != nil {
return nil, err
}
return output, nil
}
func (k *kafka) init(cfg *ucfg.Config) error {
debugf("initialize kafka output")
config := defaultConfig
if err := cfg.Unpack(&config); err != nil {
return err
}
libCfg, retries, err := newKafkaConfig(&config)
if err != nil {
return err
}
hosts := config.Hosts
if len(hosts) < 1 {
logp.Err("Kafka configuration failed with: %v", errNoHosts)
return errNoHosts
}
debugf("hosts: %v", hosts)
useType := config.UseType
topic := config.Topic
if topic == "" && !useType {
logp.Err("Kafka configuration failed with: %v", errNoTopicSet)
return errNoTopicSet
}
var clients []mode.AsyncProtocolClient
worker := 1
if config.Worker > 1 {
worker = config.Worker
}
for i := 0; i < worker; i++ {
client, err := newKafkaClient(hosts, topic, useType, libCfg)
if err != nil {
logp.Err("Failed to create kafka client: %v", err)
return err
}
clients = append(clients, client)
}
mode, err := mode.NewAsyncConnectionMode(
clients,
false,
retries, // retry implemented by kafka client
libCfg.Producer.Retry.Backoff,
libCfg.Net.WriteTimeout,
10*time.Second)
if err != nil {
logp.Err("Failed to configure kafka connection: %v", err)
return err
}
k.mode = mode
return nil
}
func (k *kafka) Close() error {
return k.mode.Close()
}
func (k *kafka) PublishEvent(
signal outputs.Signaler,
opts outputs.Options,
event common.MapStr,
) error {
return k.mode.PublishEvent(signal, opts, event)
}
func (k *kafka) BulkPublish(
signal outputs.Signaler,
opts outputs.Options,
event []common.MapStr,
) error {
return k.mode.PublishEvents(signal, opts, event)
}
func newKafkaConfig(config *kafkaConfig) (*sarama.Config, int, error) {
k := sarama.NewConfig()
modeRetries := 1
// configure network level properties
timeout := time.Duration(config.Timeout) * time.Second
k.Net.DialTimeout = timeout
k.Net.ReadTimeout = timeout
k.Net.WriteTimeout = timeout
k.Net.KeepAlive = config.KeepAlive
k.Producer.Timeout = config.BrokerTimeout
tls, err := outputs.LoadTLSConfig(config.TLS)
if err != nil {
return nil, modeRetries, err
}
k.Net.TLS.Enable = tls != nil
k.Net.TLS.Config = tls
// TODO: configure metadata level properties
// use lib defaults
// configure producer API properties
if config.MaxMessageBytes != nil {
k.Producer.MaxMessageBytes = *config.MaxMessageBytes
}
if config.RequiredACKs != nil {
k.Producer.RequiredAcks = sarama.RequiredAcks(*config.RequiredACKs)
}
compressionMode, ok := compressionModes[strings.ToLower(config.Compression)]
if !ok {
return nil, modeRetries, fmt.Errorf("Unknown compression mode: %v", config.Compression)
}
k.Producer.Compression = compressionMode
k.Producer.Return.Successes = true // enable return channel for signaling
k.Producer.Return.Errors = true
if config.MaxRetries != nil {
retries := *config.MaxRetries
if retries < 0 {
retries = 10
modeRetries = -1
}
k.Producer.Retry.Max = retries
}
// configure client ID
k.ClientID = config.ClientID
if err := k.Validate(); err != nil {
logp.Err("Invalid kafka configuration: %v", err)
return nil, modeRetries, err
}
return k, modeRetries, nil
}