[hw-5] concurrency, graceful shutdown, concurrent tests

cart/internal/app/app.go

@@ -1,6 +1,7 @@
 package app
 
 import (
+	"context"
 	"fmt"
 	"net"
 	"net/http"
@@ -68,7 +69,11 @@ func NewApp(configPath string) (*App, error) {
 	return app, nil
 }
 
-func (app *App) ListenAndServe() error {
+func (app *App) Shutdown(ctx context.Context) error {
+	return app.server.Shutdown(ctx)
+}
+
+func (app *App) ListenAndServe(_ context.Context) error {
 	address := fmt.Sprintf("%s:%s", app.config.Service.Host, app.config.Service.Port)
 
 	l, err := net.Listen("tcp", address)
@@ -96,6 +101,9 @@ func (app *App) setupCartService() (*service.CartService, error) {
 		httpClient,
 		app.config.ProductService.Token,
 		fmt.Sprintf("%s:%s", app.config.ProductService.Host, app.config.ProductService.Port),
+		app.config.ProductService.Limit,
+		app.config.ProductService.Burst,
+		app.config.Service.Workers,
 	)
 
 	// LOMS service client