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subscriber.go
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subscriber.go
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package wpc
import (
"crypto/md5"
"encoding/hex"
"github.com/apache/pulsar-client-go/pulsar"
"github.com/wshops/wpc/workerpool"
"github.com/wshops/zlog"
"sync"
"time"
)
// https://github.com/chinagocoder/go-queue/blob/main/pq/consumer.go
// https://github.com/AlexCuse/watermill-pulsar/blob/main/pkg/pulsar/subscriber.go
// https://github.com/utain/poc-realtime-go/blob/main/withpulsar/withpulsar.go
type MessageHandler func(msg *Message) error
type wpcSubscriber struct {
topic string
handler MessageHandler
workerNum int
pulsarConsumer pulsar.Consumer
messageChannel chan pulsar.ConsumerMessage
workerPool *workerpool.Pool[*wpcSubscriber]
waitGroup sync.WaitGroup
}
func NewWpcSubscriber(h MessageHandler) *wpcSubscriber {
return &wpcSubscriber{
handler: h,
}
}
func (w *wpcSubscriber) SetWorkerNum(num int) *wpcSubscriber {
w.workerNum = num
return w
}
func (w *wpcSubscriber) Subscribe(topic string, consumerOptions ...*pulsar.ConsumerOptions) *wpcSubscriber {
var c pulsar.Consumer
var err error
w.topic = topic
w.messageChannel = make(chan pulsar.ConsumerMessage)
if len(consumerOptions) == 0 {
c, err = instance.GetClient().Subscribe(pulsar.ConsumerOptions{
Topic: topic,
SubscriptionName: topic + "_subscription",
Type: pulsar.Shared,
ReceiverQueueSize: 1000,
MessageChannel: w.messageChannel,
})
} else {
consumerOptions[0].Topic = topic
consumerOptions[0].SubscriptionName = topic + "_subscription"
consumerOptions[0].MessageChannel = w.messageChannel
c, err = instance.GetClient().Subscribe(*consumerOptions[0])
}
if err != nil {
zlog.Log().Fatal(err)
}
w.pulsarConsumer = c
return w
}
func (w *wpcSubscriber) Start() {
if w.workerNum == 0 {
w.workerNum = 1
}
if w.pulsarConsumer == nil {
zlog.Log().Fatal("please subscribe first")
}
if w.handler == nil {
zlog.Log().Fatal("please set message handler first")
}
w.waitGroup = sync.WaitGroup{}
w.workerPool = workerpool.New[*wpcSubscriber](workerpool.Config{
MaxWorkersCount: uint(w.workerNum),
MaxIdleWorkerDuration: 5 * time.Second,
}, workerMessageProcessor)
instance.subscriberMap.Store(w.topic, w)
w.waitGroup.Add(1)
w.workerPool.Exec(w)
w.waitGroup.Wait()
}
func workerMessageProcessor(w *wpcSubscriber) {
for cm := range w.messageChannel {
m := AcquireMessage()
m.Topic = cm.Message.Topic()
m.Payload = cm.Message.Payload()
m.Properties = cm.Message.Properties()
m.MessageId = cm.Message.ID().Serialize()
m.PublishTime = cm.Message.PublishTime()
m.EventTime = cm.Message.EventTime()
m.RedeliveryCount = int(cm.Message.RedeliveryCount())
m.ProducerName = cm.Message.ProducerName()
if err := w.handler(m); err != nil {
zlog.Log().Error(err)
cm.Nack(cm.Message)
}
err := cm.Ack(cm.Message)
if err != nil {
zlog.Log().Error(err)
}
ReleaseMessage(m)
}
w.waitGroup.Done()
}
func md5Encode(str string) string {
hash := md5.Sum([]byte(str))
return hex.EncodeToString(hash[:])
}
func (w *wpcSubscriber) Close() {
w.pulsarConsumer.Close()
w.workerPool.Stop()
}