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kafka.go
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kafka.go
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package kafka
import (
"strings"
"time"
"github.com/Shopify/sarama"
"github.com/abulo/ratel/logger"
"github.com/pkg/errors"
)
const (
ACK_BEFORE_AUTO = 0
ACK_AFTER_NOERROR = 1
ACK_AFTER_NOMATTER = 2
)
type ProducerMessage = sarama.ProducerMessage
type ProducerError = sarama.ProducerError
type ConsumerMessage = sarama.ConsumerMessage
type ConsumerError = sarama.ConsumerError
type StringEncoder = sarama.StringEncoder
type ByteEncoder = sarama.ByteEncoder
type ProducerConfig struct {
Key string
Address []string // kafka地址
Async bool
ReturnSuccess bool
ReturnError bool
User string //username and password for SASL/PLAIN or SASL/SCRAM authentication
Password string
Version *sarama.KafkaVersion // kafka version
}
type ConsumerConfig struct {
Key string
Address []string // kafka地址
Group string // groupId
Offset int64
Ack int // ack类型
User string //username and password for SASL/PLAIN or SASL/SCRAM authentication
Password string
DialTimeout time.Duration // How long to wait for the initial connection.
ReadTimeout time.Duration // How long to wait for a response.
WriteTimeout time.Duration // How long to wait for a transmit.
KeepAlive time.Duration
Version *sarama.KafkaVersion // kafka version
}
type ProducerMessageHandler func(msg *ProducerMessage)
type ProducerErrorHandler func(err *ProducerError)
type Producer interface {
Close() error
Produce(msgs ...*ProducerMessage) error
AsyncHandle(mh ProducerMessageHandler, eh ProducerErrorHandler) // 必须设置 asyncReturnSuccess 或 asyncReturnError
}
type ConsumerMessageHandler func(msg *ConsumerMessage) error
type ConsumerErrorHandler func(err error)
type Consumer interface {
Close() error
// blocking to consume the messages
Consume(topics string, mh ConsumerMessageHandler, eh ConsumerErrorHandler) error
ConsumeM(topics []string, mh ConsumerMessageHandler, eh ConsumerErrorHandler) error
}
func producerConfig(opt *ProducerConfig) (config *sarama.Config) {
config = sarama.NewConfig()
if opt.Version != nil {
config.Version = *opt.Version
} else {
config.Version = sarama.V2_6_0_0 // consumer groups require Version to be >= V0_10_2_0
}
if opt.User != "" { // only plain
config.Net.SASL.Enable = true
config.Net.SASL.Mechanism = sarama.SASLTypePlaintext
config.Net.SASL.User = opt.User
config.Net.SASL.Password = opt.Password
}
config.Producer.Return.Successes = opt.ReturnSuccess
config.Producer.Return.Errors = opt.ReturnError
return
}
func consumerConfig(opt *ConsumerConfig) (config *sarama.Config) {
config = sarama.NewConfig()
if opt.Version != nil {
config.Version = *opt.Version
} else {
config.Version = sarama.V2_6_0_0 // consumer groups require Version to be >= V0_10_2_0
}
if opt.User != "" { // only plain
config.Net.SASL.Enable = true
config.Net.SASL.Mechanism = sarama.SASLTypePlaintext
config.Net.SASL.User = opt.User
config.Net.SASL.Password = opt.Password
}
if opt.KeepAlive > 0 {
config.Net.KeepAlive = opt.KeepAlive
}
if opt.DialTimeout > 0 {
config.Net.DialTimeout = opt.DialTimeout
}
if opt.ReadTimeout > 0 {
config.Net.ReadTimeout = opt.ReadTimeout
}
if opt.WriteTimeout > 0 {
config.Net.WriteTimeout = opt.WriteTimeout
}
if opt.Offset < 0 { // only -1(OffsetNewest), -2(OffsetOldest)
if opt.Offset == sarama.OffsetNewest {
config.Consumer.Offsets.Initial = sarama.OffsetNewest
} else if opt.Offset == sarama.OffsetOldest {
config.Consumer.Offsets.Initial = sarama.OffsetOldest
} else {
logger.Logger.Panic("invalid initial offset")
}
}
return
}
var producers map[string]Producer = make(map[string]Producer)
var consumers map[string]Consumer = make(map[string]Consumer)
func GetProducer(key string) Producer {
if rt, ok := producers[key]; ok {
return rt
}
return nil
}
func GetConsumer(key string) Consumer {
if rt, ok := consumers[key]; ok {
return rt
}
return nil
}
func SetupProducer(opt *ProducerConfig) (err error) {
keys := strings.Split(opt.Key, ",")
for _, k := range keys {
if _, ok := producers[k]; ok {
err = errors.New("duplicate kafka producer key " + k)
return
}
}
var p Producer
if opt.Async {
p, err = newSaramaAsyncProducer(opt)
} else {
p, err = newSaramaSyncProducer(opt)
}
if err != nil {
return
}
for _, k := range keys {
producers[k] = p
}
return
}
func SetupConsumer(opt *ConsumerConfig) (err error) {
keys := strings.Split(opt.Key, ",")
for _, k := range keys {
if _, ok := consumers[k]; ok {
err = errors.New("duplicate kafka consumer key " + k)
return
}
}
c, err := newSaramaConsumerGroup(opt)
if err != nil {
return
}
for _, k := range keys {
consumers[k] = c
}
return
}
func Close() {
for _, p := range producers {
p.Close()
}
for _, c := range consumers {
c.Close()
}
}