chore: refactored project according to clean architecture

internal/handler/grpc/errors.go

@@ -0,0 +1,24 @@
+package handler
+
+import (
+	"errors"
+
+	"orderservice/internal/domain"
+
+	"google.golang.org/grpc/codes"
+	"google.golang.org/grpc/status"
+)
+
+func mapError(err error) error {
+	if errors.Is(err, domain.ErrOrderNotFound) {
+		return status.Error(codes.NotFound, err.Error())
+	}
+	if errors.Is(err, domain.ErrOrderAlreadyExist) {
+		return status.Error(codes.AlreadyExists, err.Error())
+	}
+	if errors.Is(err, domain.ErrInvalidOrderData) {
+		return status.Error(codes.InvalidArgument, err.Error())
+	}
+
+	return status.Error(codes.Internal, "internal server error")
+}