[hw-6] add notifier service, kafka

notifier/internal/domain/service/service.go

@@ -0,0 +1,42 @@
+package service
+
+import (
+	"context"
+	"time"
+
+	"github.com/rs/zerolog/log"
+)
+
+type StatusConsumer interface {
+	FetchEvents(ctx context.Context) error
+}
+
+type NotifierService struct {
+	consumer StatusConsumer
+}
+
+func NewNotifierService(consumer StatusConsumer) *NotifierService {
+	return &NotifierService{
+		consumer: consumer,
+	}
+}
+
+func (s *NotifierService) RunFetchEvents(ctx context.Context) error {
+	backoff := 1 * time.Second
+
+	for {
+		if err := s.consumer.FetchEvents(ctx); err != nil {
+			if ctx.Err() != nil {
+				return ctx.Err()
+			}
+
+			log.Error().Err(err).Msgf("consume error (retrying in %d second(s))", backoff)
+		}
+
+		select {
+		case <-ctx.Done():
+			return ctx.Err()
+		case <-time.After(backoff):
+		}
+	}
+}