add outbound traffic reset (#1767)

web/service/outbound.go

@@ -78,3 +78,25 @@ func (s *OutboundService) GetOutboundsTraffic() ([]*model.OutboundTraffics, erro
 
 	return traffics, nil
 }
+
+func (s *OutboundService) ResetOutboundTraffic(tag string) error {
+	db := database.GetDB()
+
+	whereText := "tag "
+	if tag == "-alltags-" {
+		whereText += " <> ?"
+	} else {
+		whereText += " = ?"
+	}
+
+	result := db.Model(model.OutboundTraffics{}).
+		Where(whereText, tag).
+		Updates(map[string]interface{}{"up": 0, "down": 0, "total": 0})
+
+	err := result.Error
+	if err != nil {
+		return err
+	}
+
+	return nil
+}