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producer.go
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producer.go
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package healer
import (
"context"
"fmt"
"math/rand"
"sync"
"time"
"github.com/aviddiviner/go-murmur"
)
type ctxKey string
var leaderKey ctxKey = "leader"
var parentProducerKey ctxKey = "parentProducer"
type Producer struct {
config ProducerConfig
topic string
brokers *Brokers
topicMeta TopicMetadata
pidToSimpleProducers map[int32]*SimpleProducer
leaderBrokersMapping map[int32]*Broker
currentProducer *SimpleProducer
lock sync.Mutex
ctx context.Context
}
// NewProducer creates a new console producer.
// config can be a map[string]interface{} or a ProducerConfig,
// use DefaultProducerConfig if config is nil
func NewProducer(topic string, config interface{}) (*Producer, error) {
cfg, err := createProducerConfig(config)
logger.Info("create producer", "origin_config", config, "final_config", cfg)
if err != nil {
return nil, err
}
p := &Producer{
config: cfg,
topic: topic,
pidToSimpleProducers: make(map[int32]*SimpleProducer),
leaderBrokersMapping: make(map[int32]*Broker),
}
brokerConfig := getBrokerConfigFromProducerConfig(&cfg)
p.brokers, err = NewBrokersWithConfig(cfg.BootstrapServers, brokerConfig)
if err != nil {
err = fmt.Errorf("init brokers error: %w", err)
return nil, err
}
for {
if err = p.updateCurrentSimpleProducer(); err != nil {
logger.Error(err, "update current simple consumer, sleep and retry", "topic", p.topic, "retry_backoff_ms", p.config.RetryBackOffMS)
time.Sleep(time.Duration(p.config.RetryBackOffMS) * time.Millisecond)
} else {
break
}
}
ctx := context.Background()
p.ctx = context.WithValue(ctx, parentProducerKey, p)
go func() {
for range time.NewTicker(time.Duration(cfg.MetadataMaxAgeMS) * time.Millisecond).C {
err := p.updateCurrentSimpleProducer()
if err != nil {
logger.Error(err, "refresh simple producer failed", "topic", p.topic)
}
}
}()
return p, nil
}
// update metadata and currentProducer
func (p *Producer) updateCurrentSimpleProducer() error {
metadataResponse, err := p.brokers.RequestMetaData(p.config.ClientID, []string{p.topic})
if err == nil {
err = metadataResponse.Error()
}
if err != nil {
return fmt.Errorf("get metadata of %s error: %w", p.topic, err)
}
p.topicMeta = metadataResponse.TopicMetadatas[0]
validPartitionID := make([]int32, 0)
for _, partition := range p.topicMeta.PartitionMetadatas {
if partition.PartitionErrorCode == 0 {
validPartitionID = append(validPartitionID, partition.PartitionID)
}
}
partitionID := validPartitionID[rand.Int31n(int32(len(validPartitionID)))]
sp, err := NewSimpleProducer(context.Background(), p.topic, partitionID, p.config)
if err != nil {
return fmt.Errorf("change current simple producer to %s-%d error: %w", p.topic, partitionID, err)
}
p.lock.Lock()
defer p.lock.Unlock()
if p.currentProducer == nil {
logger.Info("init current simple producer", "leader", sp.leader)
p.currentProducer = sp
} else {
older := p.currentProducer
logger.Info("update current simple producer", "older", older, "oldLeader", older.leader, "new", sp, "newLeader", sp.leader)
p.currentProducer = sp
older.Close()
}
return nil
}
// getLeaderID return the leader broker id of the partition from metadata cache
func (p *Producer) getLeaderID(pid int32) (int32, error) {
for _, partition := range p.topicMeta.PartitionMetadatas {
if partition.PartitionID == pid {
if partition.PartitionErrorCode == 0 {
return partition.Leader, nil
}
return -1, getErrorFromErrorCode(partition.PartitionErrorCode)
}
}
return -1, fmt.Errorf("partition %s-%d not found in metadata", p.topic, pid)
}
// getSimpleProducer return the simple producer. if key is nil, return the current simple producer
func (p *Producer) getSimpleProducer(key []byte) (*SimpleProducer, error) {
if key == nil {
p.lock.Lock()
defer p.lock.Unlock()
return p.currentProducer, nil
}
partitionID := int32(murmur.MurmurHash2(key, 0) % uint32(len(p.topicMeta.PartitionMetadatas)))
if sp, ok := p.pidToSimpleProducers[partitionID]; ok {
return sp, nil
}
leaderID, err := p.getLeaderID(partitionID)
if err != nil {
return nil, err
}
broker, ok := p.leaderBrokersMapping[leaderID]
if !ok {
broker, err = p.brokers.NewBroker(leaderID)
if err != nil {
return nil, fmt.Errorf("create broker %d error: %s", leaderID, err)
}
p.leaderBrokersMapping[leaderID] = broker
}
ctx := context.WithValue(p.ctx, leaderKey, broker)
sp, err := NewSimpleProducer(ctx, p.topic, partitionID, p.config)
if err != nil {
return nil, fmt.Errorf("could not create simple producer from the %s-%d", p.topic, partitionID)
}
p.pidToSimpleProducers[partitionID] = sp
return sp, nil
}
// AddMessage add message to the producer, if key is nil, use current simple producer, else use the simple producer of the partition of the key
// if the simple producer of the partition of the key not exist, create a new one
// if the simple producer closed, retry 3 times
func (p *Producer) AddMessage(key []byte, value []byte) error {
for i := 0; i < 3; i++ {
simpleProducer, err := p.getSimpleProducer(key)
if err != nil {
return err
}
err = simpleProducer.AddMessage(key, value)
if err == ErrProducerClosed { // maybe current simple-producer closed in ticker, retry
logger.V(1).Info("simple producer closed, retry", "producer", simpleProducer)
continue
}
return err
}
return nil
}
// Close close all simple producers in the console producer
func (p *Producer) Close() {
if p.currentProducer != nil {
p.currentProducer.Close()
}
for _, sp := range p.pidToSimpleProducers {
sp.Close()
}
for _, broker := range p.leaderBrokersMapping {
broker.Close()
}
}