RuntimeConfigSource.php

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<?php
namespace Magento\Config\App\Config\Source;

use Magento\Framework\App\Config\ConfigSourceInterface;
use Magento\Framework\App\Config\ScopeCodeResolver;
use Magento\Framework\App\Config\ScopeConfigInterface;
use Magento\Framework\DataObject;
use Magento\Config\Model\ResourceModel\Config\Data\CollectionFactory;
use Magento\Framework\App\Config\Scope\Converter;

class RuntimeConfigSource implements ConfigSourceInterface
{
    private $collectionFactory;

    private $converter;

    private $scopeCodeResolver;

    public function __construct(
        CollectionFactory $collectionFactory,
        ScopeCodeResolver $scopeCodeResolver,
        Converter $converter
    ) {
        $this->collectionFactory = $collectionFactory;
        $this->converter = $converter;
        $this->scopeCodeResolver = $scopeCodeResolver;
    }

    public function get($path = '')
    {
        $data = new DataObject($this->loadConfig());
        return $data->getData($path) ?: [];
    }

    private function loadConfig()
    {
        try {
            $collection = $this->collectionFactory->create();
        } catch (\DomainException $e) {
            $collection = [];
        }
        $config = [];
        foreach ($collection as $item) {
            if ($item->getScope() === ScopeConfigInterface::SCOPE_TYPE_DEFAULT) {
                $config[$item->getScope()][$item->getPath()] = $item->getValue();
            } else {
                $code = $this->scopeCodeResolver->resolve($item->getScope(), $item->getScopeId());
                $config[$item->getScope()][$code][$item->getPath()] = $item->getValue();
            }
        }

        foreach ($config as $scope => &$item) {
            if ($scope === ScopeConfigInterface::SCOPE_TYPE_DEFAULT) {
                $item = $this->converter->convert($item);
            } else {
                foreach ($item as &$scopeItems) {
                    $scopeItems = $this->converter->convert($scopeItems);
                }
            }
        }
        return $config;
    }
}