[GitHub] [pulsar-client-go] wolfstudy commented on pull request #366: [WIP][consumer] Deadlock with in-flight acknowledgements

[GitBox <gi...@apache.org>]

wolfstudy commented on pull request #366:
URL: https://github.com/apache/pulsar-client-go/pull/366#issuecomment-693119010


   ```
   package main
   
   import (
   	"context"
   	"fmt"
   	"github.com/apache/pulsar-client-go/pulsar"
   	"log"
   	"math/rand"
   	"time"
   )
   
   func main() {
   	//  create client
   	client, err := pulsar.NewClient(pulsar.ClientOptions{
   		URL:                     "pulsar://localhost:6650",
   		MaxConnectionsPerBroker: 1,
   	})
   	if err != nil {
   		log.Fatal(err)
   	}
   	defer client.Close()
   
   	topic := randomName("topic-name")
   
   	// create consumer
   	consumer, err := client.Subscribe(pulsar.ConsumerOptions{
   		Name:                        randomName("consumer-name"),
   		SubscriptionName:            randomName("subscription-name"),
   		Topic:                       topic,
   		Type:                        pulsar.KeyShared,
   		SubscriptionInitialPosition: pulsar.SubscriptionPositionEarliest,
   	})
   	if err != nil {
   		log.Fatal(err)
   	}
   	defer consumer.Close()
   
   	// create producer
   	producer, err := client.CreateProducer(pulsar.ProducerOptions{
   		Topic: topic,
   		Name:  randomName("producer-name"),
   	})
   	if err != nil {
   		log.Fatal(err)
   	}
   	defer producer.Close()
   
   	// Publishing a lot of messages to target topic
   	countMsg := 10000
   	log.Printf("Publishing %d messages", countMsg)
   
   	// publish messages
   	for i := 0; i < countMsg; i++ {
   		_, err := producer.Send(context.Background(), &pulsar.ProducerMessage{
   			Payload:   []byte(fmt.Sprintf("payload-%d", i)),
   			Key:       fmt.Sprintf("msg-key-%d", i),
   			EventTime: time.Now(),
   		})
   		if err != nil {
   			log.Fatal(err)
   		}
   	}
   
   	// receive message
   	log.Println("Starting consumer routine")
   	for i := 1; i <= countMsg; i++ {
   		msg, err := consumer.Receive(context.Background())
   		if err != nil {
   			log.Fatal(err)
   		}
   		log.Printf("Got message %d", i)
   		consumer.Ack(msg)
   	}
   
   }
   
   func randomName(prefix string) string {
   	return fmt.Sprintf("%s-%x", prefix, rand.Int63())
   }
   ```


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