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kafka.go
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kafka.go
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package broker
import (
"context"
"errors"
"fmt"
"strings"
"time"
"github.com/IBM/sarama"
"github.com/golangid/candi/candihelper"
"github.com/golangid/candi/candishared"
"github.com/golangid/candi/codebase/factory/types"
"github.com/golangid/candi/codebase/interfaces"
"github.com/golangid/candi/config/env"
"github.com/golangid/candi/logger"
"github.com/golangid/candi/tracer"
)
// KafkaOptionFunc func type
type KafkaOptionFunc func(*KafkaBroker)
// KafkaSetWorkerType set worker type
func KafkaSetWorkerType(workerType types.Worker) KafkaOptionFunc {
return func(bk *KafkaBroker) {
bk.WorkerType = workerType
}
}
// KafkaSetBrokerHost set custom broker host
func KafkaSetBrokerHost(brokers []string) KafkaOptionFunc {
return func(kb *KafkaBroker) {
kb.BrokerHost = brokers
}
}
// KafkaSetConfig set custom sarama configuration
func KafkaSetConfig(cfg *sarama.Config) KafkaOptionFunc {
return func(kb *KafkaBroker) {
kb.Config = cfg
}
}
// KafkaSetPublisher set custom publisher
func KafkaSetPublisher(pub interfaces.Publisher) KafkaOptionFunc {
return func(kb *KafkaBroker) {
kb.publisher = pub
}
}
// GetDefaultKafkaConfig construct default kafka config
func GetDefaultKafkaConfig(additionalConfigFunc ...func(*sarama.Config)) *sarama.Config {
version := env.BaseEnv().Kafka.ClientVersion
if version == "" {
version = "2.0.0"
}
// set default configuration
cfg := sarama.NewConfig()
cfg.Version, _ = sarama.ParseKafkaVersion(version)
// Producer config
cfg.ClientID = env.BaseEnv().Kafka.ClientID
cfg.Producer.Retry.Max = 15
cfg.Producer.Retry.Backoff = 50 * time.Millisecond
cfg.Producer.RequiredAcks = sarama.WaitForAll
cfg.Producer.Return.Successes = true
// Consumer config
cfg.Consumer.Offsets.Initial = sarama.OffsetOldest
cfg.Consumer.Group.Rebalance.Strategy = sarama.NewBalanceStrategyRoundRobin()
for _, additionalFunc := range additionalConfigFunc {
additionalFunc(cfg)
}
return cfg
}
// KafkaBroker configuration
type KafkaBroker struct {
WorkerType types.Worker
BrokerHost []string
Config *sarama.Config
Client sarama.Client
publisher interfaces.Publisher
}
// NewKafkaBroker setup kafka configuration for publisher or consumer, empty option param for default configuration (with default worker type is types.Kafka)
func NewKafkaBroker(opts ...KafkaOptionFunc) *KafkaBroker {
defer logger.LogWithDefer("Load Kafka broker configuration... ")()
kb := new(KafkaBroker)
kb.BrokerHost = env.BaseEnv().Kafka.Brokers
kb.WorkerType = types.Kafka
for _, opt := range opts {
opt(kb)
}
if kb.Config == nil {
// set default configuration
kb.Config = GetDefaultKafkaConfig()
}
saramaClient, err := sarama.NewClient(kb.BrokerHost, kb.Config)
if err != nil {
panic(fmt.Errorf("%s. Brokers: %s", err, strings.Join(kb.BrokerHost, ", ")))
}
kb.Client = saramaClient
if kb.publisher == nil {
kb.publisher = NewKafkaPublisher(saramaClient, false) // default publisher is sync
}
return kb
}
// GetPublisher method
func (k *KafkaBroker) GetPublisher() interfaces.Publisher {
return k.publisher
}
// GetName method
func (k *KafkaBroker) GetName() types.Worker {
return k.WorkerType
}
// Health method
func (k *KafkaBroker) Health() map[string]error {
mErr := make(map[string]error)
var err error
if len(k.Client.Brokers()) == 0 {
err = errors.New("not ok")
}
mErr[string(types.Kafka)] = err
return mErr
}
// Disconnect method
func (k *KafkaBroker) Disconnect(ctx context.Context) error {
defer logger.LogWithDefer("kafka: disconnect...")()
return k.Client.Close()
}
// kafkaPublisher kafka publisher
type kafkaPublisher struct {
producerSync sarama.SyncProducer
producerAsync sarama.AsyncProducer
broker string
}
// NewKafkaPublisher setup only kafka publisher with client connection
func NewKafkaPublisher(client sarama.Client, async bool) interfaces.Publisher {
var err error
kafkaPublisher := &kafkaPublisher{}
if async {
kafkaPublisher.producerAsync, err = sarama.NewAsyncProducerFromClient(client)
} else {
kafkaPublisher.producerSync, err = sarama.NewSyncProducerFromClient(client)
}
if err != nil {
logger.LogYellow(fmt.Sprintf("(Kafka publisher: warning, %v. Should be panicked when using kafka publisher.) ", err))
return nil
}
brokers := client.Brokers()
for i, cl := range brokers {
kafkaPublisher.broker += cl.Addr()
if i < len(brokers)-1 {
kafkaPublisher.broker += ","
}
}
return kafkaPublisher
}
// PublishMessage method
func (p *kafkaPublisher) PublishMessage(ctx context.Context, args *candishared.PublisherArgument) (err error) {
trace, _ := tracer.StartTraceWithContext(ctx, "kafka:publish_message")
defer trace.Finish(
tracer.FinishWithRecoverPanic(func(panicMessage any) { err = fmt.Errorf("%v", panicMessage) }),
)
var payload []byte
if len(args.Message) > 0 {
payload = args.Message
} else {
payload = candihelper.ToBytes(args.Data)
}
trace.SetTag("brokers", p.broker)
trace.SetTag("topic", args.Topic)
trace.SetTag("key", args.Key)
trace.Log("header", args.Header)
trace.Log("message", payload)
msg := &sarama.ProducerMessage{
Topic: args.Topic,
Key: sarama.ByteEncoder([]byte(args.Key)),
Value: sarama.ByteEncoder(payload),
Timestamp: time.Now(),
}
traceHeader := map[string]string{}
trace.InjectRequestHeader(traceHeader)
for k, v := range traceHeader {
msg.Headers = append(msg.Headers, sarama.RecordHeader{
Key: []byte(k),
Value: []byte(v),
})
}
for keyHeader, valueHeader := range args.Header {
msg.Headers = append(msg.Headers, sarama.RecordHeader{
Key: []byte(keyHeader),
Value: candihelper.ToBytes(valueHeader),
})
}
if p.producerSync != nil {
_, _, err = p.producerSync.SendMessage(msg)
trace.SetError(err)
} else {
p.producerAsync.Input() <- msg
}
return
}