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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/elastic/beats/libbeat/common"
"github.com/elastic/beats/libbeat/common/op"
"github.com/elastic/beats/libbeat/logp"
"github.com/elastic/beats/libbeat/outputs"
"github.com/elastic/beats/libbeat/outputs/mode"
"github.com/elastic/beats/libbeat/outputs/mode/modeutil"
)
type kafka struct {
config kafkaConfig
modeRetry mode.ConnectionMode
modeGuaranteed mode.ConnectionMode
}
const (
defaultWaitRetry = 1 * time.Second
// NOTE: maxWaitRetry has no effect on mode, as logstash client currently does
// not return ErrTempBulkFailure
defaultMaxWaitRetry = 60 * time.Second
)
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,
}
)
// New instantiates a new kafka output instance.
func New(cfg *common.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 *common.Config) error {
debugf("initialize kafka output")
k.config = defaultConfig
if err := cfg.Unpack(&k.config); err != nil {
return err
}
_, err := newKafkaConfig(&k.config)
if err != nil {
return err
}
return nil
}
func (k *kafka) initMode(guaranteed bool) (mode.ConnectionMode, error) {
libCfg, err := newKafkaConfig(&k.config)
if err != nil {
return nil, err
}
if guaranteed {
libCfg.Producer.Retry.Max = 1000
}
worker := 1
if k.config.Worker > 1 {
worker = k.config.Worker
}
var clients []mode.AsyncProtocolClient
hosts := k.config.Hosts
topic := k.config.Topic
useType := k.config.UseType
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 nil, err
}
clients = append(clients, client)
}
maxAttempts := 1
if guaranteed {
maxAttempts = 0
}
mode, err := modeutil.NewAsyncConnectionMode(
clients,
false,
maxAttempts,
defaultWaitRetry,
libCfg.Net.WriteTimeout,
defaultMaxWaitRetry)
if err != nil {
logp.Err("Failed to configure kafka connection: %v", err)
return nil, err
}
return mode, nil
}
func (k *kafka) getMode(opts outputs.Options) (mode.ConnectionMode, error) {
var err error
guaranteed := opts.Guaranteed || k.config.MaxRetries == -1
if guaranteed {
if k.modeGuaranteed == nil {
k.modeGuaranteed, err = k.initMode(true)
}
return k.modeGuaranteed, err
}
if k.modeRetry == nil {
k.modeRetry, err = k.initMode(false)
}
return k.modeRetry, err
}
func (k *kafka) Close() error {
var err error
if k.modeGuaranteed != nil {
err = k.modeGuaranteed.Close()
}
if k.modeRetry != nil {
tmp := k.modeRetry.Close()
if err == nil {
err = tmp
}
}
return err
}
func (k *kafka) PublishEvent(
signal op.Signaler,
opts outputs.Options,
event common.MapStr,
) error {
mode, err := k.getMode(opts)
if err != nil {
return err
}
return mode.PublishEvent(signal, opts, event)
}
func (k *kafka) BulkPublish(
signal op.Signaler,
opts outputs.Options,
event []common.MapStr,
) error {
mode, err := k.getMode(opts)
if err != nil {
return err
}
return mode.PublishEvents(signal, opts, event)
}
func newKafkaConfig(config *kafkaConfig) (*sarama.Config, error) {
k := sarama.NewConfig()
// configure network level properties
timeout := config.Timeout
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, 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, 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
// have retries being handled by libbeat, disable retries in sarama library
retryMax := config.MaxRetries
if retryMax < 0 {
retryMax = 1000
}
k.Producer.Retry.Max = retryMax
// configure per broker go channel buffering
k.ChannelBufferSize = config.ChanBufferSize
// configure client ID
k.ClientID = config.ClientID
if err := k.Validate(); err != nil {
logp.Err("Invalid kafka configuration: %v", err)
return nil, err
}
return k, nil
}