init gateway-service

services/gateway-service/internal/api/handlers/error.go

@@ -0,0 +1,55 @@
+package handlers
+
+import (
+	"errors"
+
+	"github.com/gofiber/fiber/v2"
+	"github.com/gofiber/fiber/v2/log"
+	"google.golang.org/grpc/codes"
+	"google.golang.org/grpc/status"
+)
+
+func ErrorHandler(c *fiber.Ctx, err error) error {
+    c.Set(fiber.HeaderContentType, fiber.MIMEApplicationJSONCharsetUTF8)
+    code := fiber.StatusInternalServerError
+	msg := err.Error()
+
+    // Retrieval of codes from fiber.Errors
+    var e *fiber.Error
+    if errors.As(err, &e) {
+        code = e.Code
+    } else {
+		// Retrival of codes from gRPC errors.
+		status, ok := status.FromError(err)
+		if ok {
+			msg = status.Message()
+
+			switch status.Code() {
+			case codes.NotFound:
+				code = fiber.StatusNotFound
+			case codes.InvalidArgument:
+				code = fiber.StatusUnprocessableEntity
+			case codes.AlreadyExists:
+				code = fiber.StatusConflict
+			case codes.PermissionDenied:
+				code = fiber.StatusForbidden
+			case codes.Unauthenticated:
+				code = fiber.StatusUnauthorized
+			case codes.Internal:
+				code = fiber.StatusInternalServerError
+			case codes.Unavailable:
+				code = fiber.StatusBadGateway
+				msg = "Service unavaliable for request."
+			default:
+				code = fiber.StatusInternalServerError
+				msg = "Something went wrong."
+				log.Error(err)
+			}
+		} else {
+			msg = "Something unexpected went wrong."
+			log.Error(err)
+		}
+	}
+
+    return c.Status(code).JSON(fiber.Map{"status": "failure", "msg": msg})
+}