chore: initial commit

cmd/product-service/main.go

@@ -0,0 +1,99 @@
+// Copyright (C) 2024 Declan Teevan
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Affero General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Affero General Public License for more details.
+//
+// You should have received a copy of the GNU Affero General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+package main
+
+import (
+	"github.com/jackc/pgx/v5/pgxpool"
+	"github.com/rs/zerolog/log"
+	"github.com/twmb/franz-go/pkg/kgo"
+
+	"github.com/hexolan/stocklet/internal/pkg/messaging"
+	"github.com/hexolan/stocklet/internal/pkg/metrics"
+	"github.com/hexolan/stocklet/internal/pkg/serve"
+	"github.com/hexolan/stocklet/internal/pkg/storage"
+	"github.com/hexolan/stocklet/internal/svc/product"
+	"github.com/hexolan/stocklet/internal/svc/product/api"
+	"github.com/hexolan/stocklet/internal/svc/product/controller"
+)
+
+func loadConfig() *product.ServiceConfig {
+	// Load the core service configuration
+	cfg, err := product.NewServiceConfig()
+	if err != nil {
+		log.Panic().Err(err).Msg("")
+	}
+
+	// Configure metrics (logging and OTEL)
+	metrics.ConfigureLogger()
+	metrics.InitTracerProvider(&cfg.Shared.Otel, "product")
+
+	return cfg
+}
+
+func usePostgresController(cfg *product.ServiceConfig) (product.StorageController, *pgxpool.Pool) {
+	// load the Postgres configuration
+	if err := cfg.Postgres.Load(); err != nil {
+		log.Panic().Err(err).Msg("")
+	}
+
+	// open a Postgres connection
+	client, err := storage.NewPostgresConn(&cfg.Postgres)
+	if err != nil {
+		log.Panic().Err(err).Msg("")
+	}
+
+	controller := controller.NewPostgresController(client)
+	return controller, client
+}
+
+func useKafkaController(cfg *product.ServiceConfig) (product.ConsumerController, *kgo.Client) {
+	// load the Kafka configuration
+	if err := cfg.Kafka.Load(); err != nil {
+		log.Panic().Err(err).Msg("")
+	}
+
+	// open a Kafka connection
+	client, err := messaging.NewKafkaConn(&cfg.Kafka, kgo.ConsumerGroup("product-service"))
+	if err != nil {
+		log.Panic().Err(err).Msg("")
+	}
+
+	controller := controller.NewKafkaController(client)
+	return controller, client
+}
+
+func main() {
+	cfg := loadConfig()
+
+	// Create the storage controller
+	store, storeCl := usePostgresController(cfg)
+	defer storeCl.Close()
+
+	// Create the service (& API interfaces)
+	svc := product.NewProductService(cfg, store)
+	grpcSvr := api.PrepareGrpc(cfg, svc)
+	gatewayMux := api.PrepareGateway(cfg)
+
+	// Create the consumer
+	consumer, consCl := useKafkaController(cfg)
+	defer consCl.Close()
+	consumer.Attach(svc)
+
+	// Serve/start the interfaces
+	go consumer.Start()
+	go serve.Gateway(gatewayMux)
+	serve.Grpc(grpcSvr)
+}