3ybactuk-marketplace-go-service-project/notifier/internal/infra/messaging/kafka/consumer.go

package kafka

import (
	"context"

	"github.com/IBM/sarama"
	"github.com/rs/zerolog/log"
)

type StatusConsumer struct {
	group sarama.ConsumerGroup
	topic string
}

func NewStatusConsumer(topic string, consumerGroup sarama.ConsumerGroup) (*StatusConsumer, error) {
	return &StatusConsumer{
		group: consumerGroup,
		topic: topic,
	}, nil
}

func (c *StatusConsumer) FetchEvents(ctx context.Context) error {
	h := &statusHandler{}

	return c.group.Consume(ctx, []string{c.topic}, h)
}

type statusHandler struct{}

func (h *statusHandler) Setup(sess sarama.ConsumerGroupSession) error {
	log.Info().Msgf("[notifier] assigned %v", sess.Claims())

	return nil
}

func (h *statusHandler) Cleanup(_ sarama.ConsumerGroupSession) error {
	return nil
}

func (h *statusHandler) ConsumeClaim(sess sarama.ConsumerGroupSession, claim sarama.ConsumerGroupClaim) error {
	for msg := range claim.Messages() {
		log.Info().Msgf("[order=%s] p=%d off=%d %s\n", string(msg.Key), msg.Partition, msg.Offset, string(msg.Value))

		sess.MarkMessage(msg, "")
	}

	return nil
}