Alerting: Return proper status code when trying to create alert notification…

Alerting: Return proper status code when trying to create alert notification channel with duplicate name or uid (#28043)

* Alerting: Return proper status code when trying to create an Alert Notification where the name or UID already exists.

Co-authored-by: Arve Knudsen <arve.knudsen@gmail.com>
Signed-off-by: Arve Knudsen <arve.knudsen@gmail.com>

pkg/api/alerting.go

 package api
 
 import (
+	"errors"
 	"fmt"
 	"strconv"
 
@@ -273,6 +274,9 @@ func CreateAlertNotification(c *models.ReqContext, cmd models.CreateAlertNotific
 	cmd.OrgId = c.OrgId
 
 	if err := bus.Dispatch(&cmd); err != nil {
+		if errors.Is(err, models.ErrAlertNotificationWithSameNameExists) || errors.Is(err, models.ErrAlertNotificationWithSameUIDExists) {
+			return Error(409, "Failed to create alert notification", err)
+		}
 		return Error(500, "Failed to create alert notification", err)
 	}
 

pkg/models/alert_notifications.go

@@ -15,6 +15,8 @@ var (
 	ErrAlertNotificationStateVersionConflict    = errors.New("alert notification state update version conflict")
 	ErrAlertNotificationStateAlreadyExist       = errors.New("alert notification state already exists")
 	ErrAlertNotificationFailedGenerateUniqueUid = errors.New("Failed to generate unique alert notification uid")
+	ErrAlertNotificationWithSameNameExists      = errors.New("alert notification with same name already exists")
+	ErrAlertNotificationWithSameUIDExists       = errors.New("alert notification with same uid already exists")
 )
 
 type AlertNotificationStateType string

pkg/services/sqlstore/alert_notification.go

@@ -299,7 +299,7 @@ func CreateAlertNotificationCommand(cmd *models.CreateAlertNotificationCommand)
 		}
 
 		if existingQuery.Result != nil {
-			return fmt.Errorf("Alert notification uid %s already exists", cmd.Uid)
+			return models.ErrAlertNotificationWithSameUIDExists
 		}
 
 		// check if name exists
@@ -309,7 +309,7 @@ func CreateAlertNotificationCommand(cmd *models.CreateAlertNotificationCommand)
 		}
 
 		if sameNameQuery.Result != nil {
-			return fmt.Errorf("Alert notification name %s already exists", cmd.Name)
+			return models.ErrAlertNotificationWithSameNameExists
 		}
 
 		var frequency time.Duration