if (! $scope.loading) $scope.loading = 0;
 $scope.refresh_statistics = function () {
      $scope.loading ++;
      $http.post(HOST + "/rpc/refresh_stats", {
        'statsId': json_stats.id
      }).success(function (data) {
          if (data['status'] == 'OK') {
            console.log("we are in ok");
            growl.addSuccessMessage(JSON.stringify(data))
          }
          else {
            growl.addErrorMessage(JSON.stringify(data))
          }
          $scope.loading--;
        }
      ).error(function(data){growl.addErrorMessage(JSON.stringify(data)); $scope.loading--;});
    };