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producer.go
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/
producer.go
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package rediqueue
import (
"bytes"
"fmt"
"strconv"
"sync"
"time"
"github.com/go-redis/redis"
)
type Producer struct {
conf *Config
client *redis.Client
errors chan *ProducerError
input, successes, retries chan *ProducerMessage
inFlight sync.WaitGroup
children map[string]map[int64]*partitionProducer
lock sync.Mutex
}
func NewProducer(client *redis.Client, config *Config) *Producer {
p := &Producer{
conf: config,
client: client,
errors: make(chan *ProducerError),
input: make(chan *ProducerMessage),
successes: make(chan *ProducerMessage),
retries: make(chan *ProducerMessage),
children: make(map[string]map[int64]*partitionProducer),
}
go withRecover(p.dispatcher)
return p
}
type ProducerMessage struct {
Topic string
Key string
Value []byte
Metadata interface{}
Partition int64
Timestamp time.Time
}
func (p *Producer) getValue() *bytes.Buffer {
return bufferPool.Get().(*bytes.Buffer)
}
func (p *Producer) releaseValue(buf *bytes.Buffer) {
buf.Reset()
bufferPool.Put(buf)
}
func (p *Producer) Input() chan<- *ProducerMessage {
return p.input
}
func (p *Producer) Close() error {
go withRecover(p.down)
var errors ProducerErrors
if p.conf.Producer.Return.Errors {
for event := range p.errors {
errors = append(errors, event)
}
}
if len(errors) > 0 {
return errors
}
return nil
}
func (p *Producer) down() {
close(p.input)
for _, v := range p.children {
for _, pp := range v {
p.inFlight.Add(1)
pp.shutdown = true
}
}
p.inFlight.Wait()
close(p.errors)
close(p.successes)
}
type ProducerError struct {
Msg *ProducerMessage
Err error
}
func (pe ProducerError) Error() string {
return fmt.Sprintf("Failed to produce message to topic %s: %s", pe.Msg.Topic, pe.Err)
}
type ProducerErrors []*ProducerError
func (pe ProducerErrors) Error() string {
return fmt.Sprintf("Failed to delivery %d messages.", len(pe))
}
func (p *Producer) dispatcher() {
handlers := make(map[string]chan<- *ProducerMessage)
for msg := range p.input {
if msg == nil {
continue
}
handler := handlers[msg.Topic]
if handler == nil {
handler = p.newTopicProducer(msg.Topic)
handlers[msg.Topic] = handler
}
handler <- msg
}
for _, handler := range handlers {
close(handler)
}
}
type topicProducer struct {
parent *Producer
topic string
input chan *ProducerMessage
handlers map[int64]chan<- *ProducerMessage
partitioner Partitioner
}
func (p *Producer) newTopicProducer(topic string) chan<- *ProducerMessage {
input := make(chan *ProducerMessage, p.conf.ChannelBufferSize)
tp := &topicProducer{
parent: p,
topic: topic,
input: input,
handlers: make(map[int64]chan<- *ProducerMessage),
partitioner: p.conf.Producer.Partitioner(topic),
}
go withRecover(tp.dispatcher)
return input
}
func (tp *topicProducer) dispatcher() {
if err := tp.saveMeta(tp.topic); err != nil {
if tp.parent.conf.Producer.Return.Errors {
tp.parent.errors <- &ProducerError{Msg: &ProducerMessage{}, Err: err}
}
return
}
for msg := range tp.input {
if err := tp.partitionMessage(msg); err != nil {
if tp.parent.conf.Producer.Return.Errors {
tp.parent.errors <- &ProducerError{Msg: msg, Err: err}
}
continue
}
handler := tp.handlers[msg.Partition]
if handler == nil {
handler = tp.newPartitionProducer(msg.Topic, msg.Partition)
tp.handlers[msg.Partition] = handler
}
handler <- msg
}
for _, handler := range tp.handlers {
close(handler)
}
}
func (tp *topicProducer) saveMeta(topic string) error {
_, er := tp.parent.client.HSet(tp.parent.conf.TopicMapName, topic, tp.parent.conf.Producer.PartitionSize).Result()
if er != nil {
return er
}
return nil
}
func (tp *topicProducer) partitionMessage(msg *ProducerMessage) error {
choice, err := tp.partitioner.Partition(msg, tp.parent.conf.Producer.PartitionSize)
if err != nil {
return err
}
msg.Partition = choice
return nil
}
type partitionProducer struct {
parent *topicProducer
topic string
partition int64
input chan *ProducerMessage
shutdown bool
}
func (tp *topicProducer) newPartitionProducer(topic string, partition int64) chan *ProducerMessage {
input := make(chan *ProducerMessage, tp.parent.conf.ChannelBufferSize)
pp := &partitionProducer{
parent: tp,
topic: topic,
partition: partition,
input: input,
}
tp.parent.addChild(pp)
go withRecover(pp.dispatcher)
return input
}
func (p *Producer) addChild(pp *partitionProducer) {
p.lock.Lock()
defer p.lock.Unlock()
topicChildren := p.children[pp.topic]
if topicChildren == nil {
topicChildren = make(map[int64]*partitionProducer)
p.children[pp.topic] = topicChildren
}
if topicChildren[pp.partition] != nil {
return
}
topicChildren[pp.partition] = pp
}
func (p *Producer) removeChild(pp *partitionProducer) {
p.lock.Lock()
defer p.lock.Unlock()
delete(p.children[pp.topic], pp.partition)
}
func (pp *partitionProducer) dispatcher() {
for msg := range pp.input {
value := pp.parent.parent.getValue()
value.WriteString(msg.Key)
value.WriteByte('_')
value.Write(msg.Value)
//redis
count := 0
Loop:
_, err := pp.parent.parent.client.LPush(msg.Topic+strconv.Itoa(int(msg.Partition)), value.Bytes()).Result()
if isNetworkError(err) {
if count > 2 {
break
}
count++
goto Loop
}
if err != nil {
if pp.parent.parent.conf.Producer.Return.Errors {
pp.parent.parent.errors <- &ProducerError{Msg: msg, Err: err}
}
continue
} else {
if pp.parent.parent.conf.Producer.Return.Successes {
pp.parent.parent.successes <- msg
}
}
pp.parent.parent.releaseValue(value)
}
if pp.shutdown {
pp.parent.parent.inFlight.Done()
}
pp.parent.parent.removeChild(pp)
}