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kafka.go
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kafka.go
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// Copyright (c) 2014 Ashley Jeffs
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
package output
import (
"strings"
"sync/atomic"
"time"
"github.com/Jeffail/benthos/lib/types"
"github.com/Jeffail/benthos/lib/util/service/log"
"github.com/Jeffail/benthos/lib/util/service/metrics"
"github.com/Shopify/sarama"
)
//------------------------------------------------------------------------------
func init() {
constructors["kafka"] = typeSpec{
constructor: NewKafka,
description: `
The kafka output type writes messages to a kafka broker, these messages are
acknowledged, which is propagated back to the input. The config field
'ack_replicas' determines whether we wait for acknowledgement from all replicas
or just a single broker.`,
}
}
//------------------------------------------------------------------------------
// KafkaConfig is configuration for the Kafka output type.
type KafkaConfig struct {
Addresses []string `json:"addresses" yaml:"addresses"`
ClientID string `json:"client_id" yaml:"client_id"`
Topic string `json:"topic" yaml:"topic"`
TimeoutMS int `json:"timeout_ms" yaml:"timeout_ms"`
AckReplicas bool `json:"ack_replicas" yaml:"ack_replicas"`
}
// NewKafkaConfig creates a new KafkaConfig with default values.
func NewKafkaConfig() KafkaConfig {
return KafkaConfig{
Addresses: []string{"localhost:9092"},
ClientID: "benthos_kafka_output",
Topic: "benthos_stream",
TimeoutMS: 5000,
AckReplicas: true,
}
}
//------------------------------------------------------------------------------
// Kafka is an output type that writes messages into kafka.
type Kafka struct {
running int32
log log.Modular
stats metrics.Type
addresses []string
conf Config
producer sarama.SyncProducer
messages <-chan types.Message
responseChan chan types.Response
closeChan chan struct{}
closedChan chan struct{}
}
// NewKafka creates a new Kafka output type.
func NewKafka(conf Config, log log.Modular, stats metrics.Type) (Type, error) {
k := Kafka{
running: 1,
log: log.NewModule(".output.kafka"),
stats: stats,
conf: conf,
messages: nil,
responseChan: make(chan types.Response),
closeChan: make(chan struct{}),
closedChan: make(chan struct{}),
}
for _, addr := range conf.Kafka.Addresses {
for _, splitAddr := range strings.Split(addr, ",") {
if len(splitAddr) > 0 {
k.addresses = append(k.addresses, splitAddr)
}
}
}
return &k, nil
}
//------------------------------------------------------------------------------
func (k *Kafka) connect() error {
config := sarama.NewConfig()
config.ClientID = k.conf.Kafka.ClientID
config.Producer.Timeout = time.Duration(k.conf.Kafka.TimeoutMS) * time.Millisecond
config.Producer.Return.Errors = true
config.Producer.Return.Successes = true
if k.conf.Kafka.AckReplicas {
config.Producer.RequiredAcks = sarama.WaitForAll
} else {
config.Producer.RequiredAcks = sarama.WaitForLocal
}
var err error
k.producer, err = sarama.NewSyncProducer(k.addresses, config)
return err
}
// loop is an internal loop that brokers incoming messages to output pipe, does
// not use select.
func (k *Kafka) loop() {
defer func() {
atomic.StoreInt32(&k.running, 0)
if nil != k.producer {
k.producer.Close()
}
close(k.responseChan)
close(k.closedChan)
}()
for {
if err := k.connect(); err != nil {
k.log.Errorf("Failed to connect to Kafka: %v\n", err)
select {
case <-time.After(time.Second):
case <-k.closeChan:
return
}
} else {
break
}
}
k.log.Infof("Sending Kafka messages to addresses: %s\n", k.addresses)
var open bool
for atomic.LoadInt32(&k.running) == 1 {
var msg types.Message
if msg, open = <-k.messages; !open {
return
}
k.stats.Incr("output.kafka.count", 1)
var err error
for _, part := range msg.Parts {
if _, _, err = k.producer.SendMessage(&sarama.ProducerMessage{
Topic: k.conf.Kafka.Topic,
Value: sarama.ByteEncoder(part),
}); err != nil {
k.stats.Incr("output.kafka.send.error", 1)
break
} else {
k.stats.Incr("output.kafka.send.success", 1)
}
}
select {
case k.responseChan <- types.NewSimpleResponse(err):
case <-k.closeChan:
return
}
}
}
// StartReceiving assigns a messages channel for the output to read.
func (k *Kafka) StartReceiving(msgs <-chan types.Message) error {
if k.messages != nil {
return types.ErrAlreadyStarted
}
k.messages = msgs
go k.loop()
return nil
}
// ResponseChan returns the errors channel.
func (k *Kafka) ResponseChan() <-chan types.Response {
return k.responseChan
}
// CloseAsync shuts down the Kafka output and stops processing messages.
func (k *Kafka) CloseAsync() {
if atomic.CompareAndSwapInt32(&k.running, 1, 0) {
close(k.closeChan)
}
}
// WaitForClose blocks until the Kafka output has closed down.
func (k *Kafka) WaitForClose(timeout time.Duration) error {
select {
case <-k.closedChan:
case <-time.After(timeout):
return types.ErrTimeout
}
return nil
}
//------------------------------------------------------------------------------