PluginList.php

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<?php
namespace Magento\Framework\Interception\PluginList;

use Magento\Framework\Config\CacheInterface;
use Magento\Framework\Config\Data\Scoped;
use Magento\Framework\Config\ReaderInterface;
use Magento\Framework\Config\ScopeInterface;
use Magento\Framework\Interception\DefinitionInterface;
use Magento\Framework\Interception\PluginListInterface as InterceptionPluginList;
use Magento\Framework\Interception\ObjectManager\ConfigInterface;
use Magento\Framework\ObjectManager\RelationsInterface;
use Magento\Framework\ObjectManager\DefinitionInterface as ClassDefinitions;
use Magento\Framework\ObjectManagerInterface;
use Magento\Framework\Serialize\SerializerInterface;
use Magento\Framework\Serialize\Serializer\Serialize;

class PluginList extends Scoped implements InterceptionPluginList
{
    protected $_inherited = [];

    protected $_processed;

    protected $_omConfig;

    protected $_relations;

    protected $_definitions;

    protected $_classDefinitions;

    protected $_objectManager;

    protected $_pluginInstances = [];

    private $logger;

    private $serializer;

    public function __construct(
        ReaderInterface $reader,
        ScopeInterface $configScope,
        CacheInterface $cache,
        RelationsInterface $relations,
        ConfigInterface $omConfig,
        DefinitionInterface $definitions,
        ObjectManagerInterface $objectManager,
        ClassDefinitions $classDefinitions,
        array $scopePriorityScheme = ['global'],
        $cacheId = 'plugins',
        SerializerInterface $serializer = null
    ) {
        $this->serializer = $serializer ?: $objectManager->get(Serialize::class);
        parent::__construct($reader, $configScope, $cache, $cacheId, $this->serializer);
        $this->_omConfig = $omConfig;
        $this->_relations = $relations;
        $this->_definitions = $definitions;
        $this->_classDefinitions = $classDefinitions;
        $this->_scopePriorityScheme = $scopePriorityScheme;
        $this->_objectManager = $objectManager;
    }

    protected function _inheritPlugins($type)
    {
        $type = ltrim($type, '\\');
        if (!array_key_exists($type, $this->_inherited)) {
            $realType = $this->_omConfig->getOriginalInstanceType($type);

            if ($realType !== $type) {
                $plugins = $this->_inheritPlugins($realType);
            } elseif ($this->_relations->has($type)) {
                $relations = $this->_relations->getParents($type);
                $plugins = [];
                foreach ($relations as $relation) {
                    if ($relation) {
                        $relationPlugins = $this->_inheritPlugins($relation);
                        if ($relationPlugins) {
                            $plugins = array_replace_recursive($plugins, $relationPlugins);
                        }
                    }
                }
            } else {
                $plugins = [];
            }
            if (isset($this->_data[$type])) {
                if (!$plugins) {
                    $plugins = $this->_data[$type];
                } else {
                    $plugins = array_replace_recursive($plugins, $this->_data[$type]);
                }
            }
            $this->_inherited[$type] = null;
            if (is_array($plugins) && count($plugins)) {
                $this->filterPlugins($plugins);
                uasort($plugins, [$this, '_sort']);
                $this->trimInstanceStartingBackslash($plugins);
                $this->_inherited[$type] = $plugins;
                $lastPerMethod = [];
                foreach ($plugins as $key => $plugin) {
                    // skip disabled plugins
                    if (isset($plugin['disabled']) && $plugin['disabled']) {
                        unset($plugins[$key]);
                        continue;
                    }
                    $pluginType = $this->_omConfig->getOriginalInstanceType($plugin['instance']);
                    if (!class_exists($pluginType)) {
                        throw new \InvalidArgumentException('Plugin class ' . $pluginType . ' doesn\'t exist');
                    }
                    foreach ($this->_definitions->getMethodList($pluginType) as $pluginMethod => $methodTypes) {
                        $current = isset($lastPerMethod[$pluginMethod]) ? $lastPerMethod[$pluginMethod] : '__self';
                        $currentKey = $type . '_' . $pluginMethod . '_' . $current;
                        if ($methodTypes & DefinitionInterface::LISTENER_AROUND) {
                            $this->_processed[$currentKey][DefinitionInterface::LISTENER_AROUND] = $key;
                            $lastPerMethod[$pluginMethod] = $key;
                        }
                        if ($methodTypes & DefinitionInterface::LISTENER_BEFORE) {
                            $this->_processed[$currentKey][DefinitionInterface::LISTENER_BEFORE][] = $key;
                        }
                        if ($methodTypes & DefinitionInterface::LISTENER_AFTER) {
                            $this->_processed[$currentKey][DefinitionInterface::LISTENER_AFTER][] = $key;
                        }
                    }
                }
            }
            return $plugins;
        }
        return $this->_inherited[$type];
    }

    private function trimInstanceStartingBackslash(&$plugins)
    {
        foreach ($plugins as &$plugin) {
            $plugin['instance'] = ltrim($plugin['instance'], '\\');
        }
    }

    protected function _sort($itemA, $itemB)
    {
        if (isset($itemA['sortOrder'])) {
            if (isset($itemB['sortOrder'])) {
                return $itemA['sortOrder'] - $itemB['sortOrder'];
            }
            return $itemA['sortOrder'];
        } elseif (isset($itemB['sortOrder'])) {
            return (0 - (int)$itemB['sortOrder']);
        } else {
            return 0;
        }
    }

    public function getPlugin($type, $code)
    {
        if (!isset($this->_pluginInstances[$type][$code])) {
            $this->_pluginInstances[$type][$code] = $this->_objectManager->get(
                $this->_inherited[$type][$code]['instance']
            );
        }
        return $this->_pluginInstances[$type][$code];
    }

    public function getNext($type, $method, $code = '__self')
    {
        $this->_loadScopedData();
        if (!isset($this->_inherited[$type]) && !array_key_exists($type, $this->_inherited)) {
            $this->_inheritPlugins($type);
        }
        $key = $type . '_' . lcfirst($method) . '_' . $code;
        return $this->_processed[$key] ?? null;
    }

    protected function _loadScopedData()
    {
        $scope = $this->_configScope->getCurrentScope();
        if (false == isset($this->_loadedScopes[$scope])) {
            if (false == in_array($scope, $this->_scopePriorityScheme)) {
                $this->_scopePriorityScheme[] = $scope;
            }
            $cacheId = implode('|', $this->_scopePriorityScheme) . "|" . $this->_cacheId;
            $data = $this->_cache->load($cacheId);
            if ($data) {
                list($this->_data, $this->_inherited, $this->_processed) = $this->serializer->unserialize($data);
                foreach ($this->_scopePriorityScheme as $scopeCode) {
                    $this->_loadedScopes[$scopeCode] = true;
                }
            } else {
                $virtualTypes = [];
                foreach ($this->_scopePriorityScheme as $scopeCode) {
                    if (false == isset($this->_loadedScopes[$scopeCode])) {
                        $data = $this->_reader->read($scopeCode) ?: [];
                        unset($data['preferences']);
                        if (count($data) > 0) {
                            $this->_inherited = [];
                            $this->_processed = [];
                            $this->merge($data);
                            foreach ($data as $class => $config) {
                                if (isset($config['type'])) {
                                    $virtualTypes[] = $class;
                                }
                            }
                        }
                        $this->_loadedScopes[$scopeCode] = true;
                    }
                    if ($this->isCurrentScope($scopeCode)) {
                        break;
                    }
                }
                foreach ($virtualTypes as $class) {
                    $this->_inheritPlugins($class);
                }
                foreach ($this->getClassDefinitions() as $class) {
                    $this->_inheritPlugins($class);
                }
                $this->_cache->save(
                    $this->serializer->serialize([$this->_data, $this->_inherited, $this->_processed]),
                    $cacheId
                );
            }
            $this->_pluginInstances = [];
        }
    }

    protected function isCurrentScope($scopeCode)
    {
        return $this->_configScope->getCurrentScope() == $scopeCode;
    }

    protected function getClassDefinitions()
    {
        return $this->_classDefinitions->getClasses();
    }

    public function merge(array $config)
    {
        foreach ($config as $type => $typeConfig) {
            if (isset($typeConfig['plugins'])) {
                $type = ltrim($type, '\\');
                if (isset($this->_data[$type])) {
                    $this->_data[$type] = array_replace_recursive($this->_data[$type], $typeConfig['plugins']);
                } else {
                    $this->_data[$type] = $typeConfig['plugins'];
                }
            }
        }
    }

    private function filterPlugins(array &$plugins)
    {
        foreach ($plugins as $name => $plugin) {
            if (empty($plugin['instance'])) {
                unset($plugins[$name]);
                $this->getLogger()->info("Reference to undeclared plugin with name '{$name}'.");
            }
        }
    }

    private function getLogger()
    {
        if ($this->logger === null) {
            $this->logger = $this->_objectManager->get(\Psr\Log\LoggerInterface::class);
        }
        return $this->logger;
    }
}