[hw-6] add notifier service, kafka

loms/internal/app/app.go

@@ -8,6 +8,7 @@ import (
 	"os"
 	"time"
 
+	"github.com/IBM/sarama"
 	"github.com/grpc-ecosystem/grpc-gateway/v2/runtime"
 	"github.com/jackc/pgx/v5/pgxpool"
 	"github.com/rs/zerolog"
@@ -22,6 +23,7 @@ import (
 	"route256/loms/internal/domain/service"
 	"route256/loms/internal/infra/config"
 	mw "route256/loms/internal/infra/grpc/middleware"
+	"route256/loms/internal/infra/messaging/kafka"
 	"route256/loms/internal/infra/postgres"
 
 	pb "route256/pkg/api/loms/v1"
@@ -61,11 +63,20 @@ func NewApp(configPath string) (*App, error) {
 		return nil, err
 	}
 
+	producer, err := setupSaramaAsyncConn([]string{c.Kafka.Brokers})
+	if err != nil {
+		return nil, err
+	}
+
 	stockRepo := stocksRepository.NewStockRepository(masterPool, replicaPool)
 	orderRepo := ordersRepository.NewOrderRepository(masterPool)
 	txManager := postgres.NewTxManager(masterPool, replicaPool)
+	kafkaProducer, err := kafka.NewStatusProducer(c.Kafka.OrderTopic, producer)
+	if err != nil {
+		return nil, err
+	}
 
-	service := service.NewLomsService(orderRepo, stockRepo, txManager)
+	service := service.NewLomsService(orderRepo, stockRepo, txManager, kafkaProducer)
 	controller := server.NewServer(service)
 
 	app := &App{
@@ -79,7 +90,6 @@ func NewApp(configPath string) (*App, error) {
 func (app *App) Shutdown(ctx context.Context) (err error) {
 	if app.httpServer != nil {
 		err = app.httpServer.Shutdown(ctx)
-
 		if err != nil {
 			log.Error().Err(err).Msgf("failed http gateway server shutdown")
 		}
@@ -197,3 +207,19 @@ func getPostgresPools(c *config.Config) (masterPool, replicaPool *pgxpool.Pool,
 
 	return pools[0], pools[1], nil
 }
+
+func setupSaramaAsyncConn(brokers []string) (sarama.AsyncProducer, error) {
+	cfg := sarama.NewConfig()
+	cfg.Producer.RequiredAcks = sarama.WaitForAll
+	cfg.Producer.Idempotent = true
+	cfg.Producer.Return.Successes = true
+	cfg.Producer.Retry.Max = 5
+	cfg.Net.MaxOpenRequests = 1
+
+	producer, err := sarama.NewAsyncProducer(brokers, cfg)
+	if err != nil {
+		return nil, fmt.Errorf("create async producer: %w", err)
+	}
+
+	return producer, nil
+}