How to break uploading from JSON into steps?

Question

1C-Bitrix

There is a JSON with 4500 products with characteristics.

Through CIBlockElement::Add I bypass the array and create a product. The problem is that a 504 error is thrown.

I tried to increase the server response time - it didn’t help.

At the same time, the goods were created in the end, but now you need to update their prices, taking them from JSON, when bypassing, 504 is also issued

//$items - json 
foreach ($items as $key => $item) {
  $arSelect = Array("ID", "PROPERTY_CML2_ARTICLE");
  $arFilter = Array("IBLOCK_ID"=>32, "PROPERTY_CML2_ARTICLE"=> $item['код_артикула']);
  $res = CIBlockElement::GetList(Array(), $arFilter, false, false, $arSelect);
  while($itemUpdate = $res->GetNext())
  {
    CPrice::SetBasePrice($itemUpdate['ID'], $item['цена'], 'RUB');
    unset($items[$key]);
  }
}

How to break a cycle into steps? Google didn't return any results, or I'm looking for something wrong

Answer 1

You can use the special Bitrix ui.stepprocessing for step-by-step scripts.
https://dev.1c-bitrix.ru/api_d7/bitrix/ui/stepproc...
https://dev.1c-bitrix.ru/api_d7/bitrix/ui/stepproc...
This is for the front. On the backend, you need to write a script that will process elements with the specified offset. And the answer must be in the format that is described in the documentation for this library.