Container::decorateLazy() - Code Metrics - Inspection of "Lazy services" - yiisoft/di - Measure and Improve Code Quality continuously with Scrutinizer

Test Failed
Pull Request — master (#232)

by Dmitriy
created 2021-08-01 10:32 UTC
Container::decorateLazy() A

↳ Parent: Container
Complexity

Conditions	4
Paths	3
Size

Total Lines	12
Code Lines	8
Duplication

Lines	0
Ratio	0 %
Code Coverage

Tests	0
CRAP Score	20
Importance

Changes	1
Bugs	0	Features	0
Metric	Value
cc	4
eloc	8
nc	3
nop	2
dl	0
loc	12
ccs	0
cts	0
cp	0
crap	20
rs	10
c	1
b	0
f	0
<?php

declare(strict_types=1);

namespace Yiisoft\Di;

use Closure;
use ProxyManager\Factory\LazyLoadingValueHolderFactory;
use Psr\Container\ContainerInterface;
use Yiisoft\Di\Contracts\DeferredServiceProviderInterface;
use Yiisoft\Di\Contracts\ServiceProviderInterface;
use Yiisoft\Factory\Definition\ArrayDefinition;
use Yiisoft\Factory\Definition\Decorator\LazyDefinitionDecorator;
filter:
    dependency_paths: ["lib/*"]
use Yiisoft\Factory\Definition\DefinitionInterface;
use Yiisoft\Factory\Definition\DefinitionValidator;
use Yiisoft\Factory\DependencyResolverInterface;
use Yiisoft\Factory\Exception\CircularReferenceException;
use Yiisoft\Factory\Exception\InvalidConfigException;
use Yiisoft\Factory\Exception\NotFoundException;
use Yiisoft\Factory\Exception\NotInstantiableException;
use Yiisoft\Injector\Injector;
use function array_key_exists;
use function array_keys;
use function assert;
use function class_exists;
use function get_class;
use function implode;
use function in_array;
use function is_array;
use function is_object;
use function is_string;

/**
 * Container implements a [dependency injection](http://en.wikipedia.org/wiki/Dependency_injection) container.
 */
final class Container extends AbstractContainerConfigurator implements ContainerInterface
{
    private const META_TAGS = 'tags';
    private const META_RESET = 'reset';
    private const META_LAZY = 'lazy';
    private const ALLOWED_META = [self::META_TAGS, self::META_RESET, self::META_LAZY];

    /**
     * @var array object definitions indexed by their types
     */
    private array $definitions = [];
    /**
     * @var array used to collect ids instantiated during build
     * to detect circular references
     */
    private array $building = [];

    /**
     * @var bool $validate Validate definitions when set
     */
    private bool $validate;

    /**
     * @var object[]
     */
    private array $instances = [];

    private array $tags;

    private array $resetters = [];

    private ?CompositeContainer $rootContainer = null;
    private DependencyResolverInterface $dependencyResolver;
    private LazyLoadingValueHolderFactory $lazyFactory;

    /**
     * Container constructor.
     *
     * @param array $definitions Definitions to put into container.
     * @param array $providers Service providers to get definitions from.
     * @param ContainerInterface|null $rootContainer Root container to delegate
     * lookup to when resolving dependencies. If provided the current container
     * is no longer queried for dependencies.
     *
     * @throws InvalidConfigException
     */
    public function __construct(
        array $definitions = [],
        array $providers = [],
        array $tags = [],
        ContainerInterface $rootContainer = null,
        bool $validate = true
    ) {
        $this->tags = $tags;
        $this->validate = $validate;
        $this->delegateLookup($rootContainer);
        $this->setDefaultDefinitions();
        $this->setMultiple($definitions);
        $this->addProviders($providers, new DependencyResolver($this));

        // Prevent circular reference to ContainerInterface
        $this->get(ContainerInterface::class);
    }

    /**
     * Returns a value indicating whether the container has the definition of the specified name.
     *
     * @param string $id class name, interface name or alias name
     *
     * @return bool whether the container is able to provide instance of class specified.
     *
     * @see set()
     */
    public function has($id): bool
    {
        if ($this->isTagAlias($id)) {
            $tag = substr($id, 4);
            return isset($this->tags[$tag]);
        }

        return isset($this->definitions[$id]) || class_exists($id);
    }

    /**
     * Returns an instance by either interface name or alias.
     *
     * Same instance of the class will be returned each time this method is called.
     *
     * @param string $id The interface or an alias name that was previously registered.
     *
     * @throws CircularReferenceException
     * @throws InvalidConfigException
     * @throws NotFoundException
     * @throws NotInstantiableException
     *
     * @return mixed|object An instance of the requested interface.
     *
     * @psalm-template T
     * @psalm-param string|class-string<T> $id
     * @psalm-return ($id is class-string ? T : mixed)
     */
    public function get($id)
    {
        if ($id === StateResetter::class && !isset($this->definitions[$id])) {
            $resetters = [];
            foreach ($this->resetters as $serviceId => $callback) {
                if (isset($this->instances[$serviceId])) {
                    $resetters[] = $callback->bindTo($this->instances[$serviceId], get_class($this->instances[$serviceId]));
                }
            }
            return new StateResetter($resetters, $this);
        }

        if (!array_key_exists($id, $this->instances)) {
            $this->instances[$id] = $this->build($id);
        }

        return $this->instances[$id];
    }

    /**
     * Delegate service lookup to another container.
     *
     * @param ContainerInterface $container
     */
    protected function delegateLookup(?ContainerInterface $container): void
    {
        if ($container !== null) {
            if ($this->rootContainer === null) {
                $this->rootContainer = new CompositeContainer();
                $this->setDefaultDefinitions();
            }

            $this->rootContainer->attach($container);
                                  attach($container);
        }

        $this->dependencyResolver = new DependencyResolver($this->rootContainer ?? $this);
    }

    /**
     * Sets a definition to the container. Definition may be defined multiple ways.
     *
     * @param string $id
     * @param mixed $definition
     *
     * @throws InvalidConfigException
     *
     * @see `DefinitionNormalizer::normalize()`
     */
    protected function set(string $id, $definition): void
    {
        [$definition, $meta] = DefinitionParser::parse($definition);
        if ($this->validate) {
            $this->validateDefinition($definition, $id);
            $this->validateMeta($meta);
        }
        $definition = DefinitionNormalizer::normalize($definition, $id);

        if (isset($meta[self::META_TAGS])) {
            if ($this->validate) {
                $this->validateTags($meta[self::META_TAGS]);
            }
            $this->setTags($id, $meta[self::META_TAGS]);
        }
        if (isset($meta[self::META_RESET])) {
            $this->setResetter($id, $meta[self::META_RESET]);
        }
        if (isset($meta[self::META_LAZY]) && $meta[self::META_LAZY] === true) {
            $definition = $this->decorateLazy($id, $definition);
        }

        unset($this->instances[$id]);
        $this->definitions[$id] = $definition;
    }

    /**
     * Sets multiple definitions at once.
     *
     * @param array $config definitions indexed by their ids
     *
     * @throws InvalidConfigException
     */
    protected function setMultiple(array $config): void
    {
        foreach ($config as $id => $definition) {
            if ($this->validate && !is_string($id)) {
                throw new InvalidConfigException(sprintf('Key must be a string. %s given.', $this->getVariableType($id)));
            }
            $this->set($id, $definition);
        }
    }

    private function setDefaultDefinitions(): void
    {
        $container = $this->rootContainer ?? $this;
        $this->setMultiple([
            ContainerInterface::class => $container,
            Injector::class => new Injector($container),
        ]);
    }

    /**
     * @param mixed $definition
     *
     * @throws InvalidConfigException
     */
    private function validateDefinition($definition, ?string $id = null): void
    {
        if (is_array($definition) && isset($definition[DefinitionParser::IS_PREPARED_ARRAY_DEFINITION_DATA])) {
            [$class, $constructorArguments, $methodsAndProperties] = $definition;
            $definition = array_merge(
                $class === null ? [] : [ArrayDefinition::CLASS_NAME => $class],
                [ArrayDefinition::CONSTRUCTOR => $constructorArguments],
                $methodsAndProperties,
            );
        }
        DefinitionValidator::validate($definition, $id);
    }

    /**
     * @throws InvalidConfigException
     */
    private function validateMeta(array $meta): void
    {
        foreach ($meta as $key => $_value) {
            if (!in_array($key, self::ALLOWED_META, true)) {
                throw new InvalidConfigException(
                    sprintf(
                        'Invalid definition: metadata "%s" is not allowed. Did you mean "%s()" or "$%s"?',
                        $key,
                        $key,
                        $key,
                    )
                );
            }
        }
    }

    private function validateTags(array $tags): void
    {
        foreach ($tags as $tag) {
            if (!is_string($tag)) {
                throw new InvalidConfigException('Invalid tag. Expected a string, got ' . var_export($tag, true) . '.');
            }
        }
    }

    private function setTags(string $id, array $tags): void
    {
        foreach ($tags as $tag) {
            if (!isset($this->tags[$tag]) || !in_array($id, $this->tags[$tag], true)) {
                $this->tags[$tag][] = $id;
            }
        }
    }

    private function setResetter(string $id, Closure $resetter): void
    {
        $this->resetters[$id] = $resetter;
    }

    /**
     * Creates new instance by either interface name or alias.
     *
     * @param string $id The interface or an alias name that was previously registered.
     *
     * @throws CircularReferenceException
     * @throws InvalidConfigException
     * @throws NotFoundException
     *
     * @return mixed|object New built instance of the specified class.
     *
     * @internal
     */
    private function build(string $id)
    {
        if ($this->isTagAlias($id)) {
            return $this->getTaggedServices($id);
        }

        if (isset($this->building[$id])) {
            if ($id === ContainerInterface::class) {
                return $this;
            }
            throw new CircularReferenceException(sprintf(
                'Circular reference to "%s" detected while building: %s.',
                $id,
                implode(',', array_keys($this->building))
            ));
        }

        $this->building[$id] = 1;
        try {
            $object = $this->buildInternal($id);
        } finally {
            unset($this->building[$id]);
        }

        return $object;
    }

    private function isTagAlias(string $id): bool
    {
        return strpos($id, 'tag@') === 0;
    }

    private function getTaggedServices(string $tagAlias): array
    {
        $tag = substr($tagAlias, 4);
        $services = [];
        if (isset($this->tags[$tag])) {
            foreach ($this->tags[$tag] as $service) {
                $services[] = $this->get($service);
            }
        }

        return $services;
    }

    /**
     * @param mixed $definition
     */
    private function processDefinition($definition): void
    {
        if ($definition instanceof DeferredServiceProviderInterface) {
            $definition->register($this);
        }
    }

    /**
     * @param string $id
     *
     * @throws InvalidConfigException
     * @throws NotFoundException
     *
     * @return mixed|object
     */
    private function buildInternal(string $id)
    {
        if (!isset($this->definitions[$id])) {
            return $this->buildPrimitive($id);
        }
        $this->processDefinition($this->definitions[$id]);

        return $this->definitions[$id]->resolve($this->dependencyResolver);
    }

    /**
     * @param string $class
     *
     * @throws InvalidConfigException
     * @throws NotFoundException
     *
     * @return mixed|object
     */
    private function buildPrimitive(string $class)
    {
        if (class_exists($class)) {
            $definition = ArrayDefinition::fromPreparedData($class);

            return $definition->resolve($this->dependencyResolver);
        }

        throw new NotFoundException($class);
    }

    private function addProviders(array $providers, DependencyResolverInterface $dependencyResolver): void
    {
        foreach ($providers as $provider) {
            $this->addProvider($provider, $dependencyResolver);
        }
    }

    /**
     * Adds service provider to the container. Unless service provider is deferred
     * it would be immediately registered.
     *
     * @param mixed $providerDefinition
     *
     * @throws InvalidConfigException
     * @throws NotInstantiableException
     *
     * @see ServiceProviderInterface
     * @see DeferredServiceProviderInterface
     */
    private function addProvider($providerDefinition, DependencyResolverInterface $dependencyResolver): void
    {
        $provider = $this->buildProvider($providerDefinition, $dependencyResolver);

        if ($provider instanceof DeferredServiceProviderInterface) {
            foreach ($provider->provides() as $id) {
                $this->definitions[$id] = $provider;
            }
        } else {
            $provider->register($this);
        }
    }

    /**
     * Builds service provider by definition.
     *
     * @param mixed $providerDefinition class name or definition of provider.
     *
     * @throws InvalidConfigException
     *
     * @return ServiceProviderInterface instance of service provider;
     */
    private function buildProvider($providerDefinition, DependencyResolverInterface $dependencyResolver): ServiceProviderInterface
    {
        if ($this->validate) {
            $this->validateDefinition($providerDefinition);
        }
        $provider = DefinitionNormalizer::normalize($providerDefinition)->resolve($dependencyResolver);
        assert($provider instanceof ServiceProviderInterface, new InvalidConfigException(
            sprintf(
                'Service provider should be an instance of %s. %s given.',
                ServiceProviderInterface::class,
                $this->getVariableType($provider)
            )
        ));

        return $provider;
    }

    /**
     * @param mixed $variable
     */
    private function getVariableType($variable): string
    {
        if (is_object($variable)) {
            return get_class($variable);
        }

        return gettype($variable);
    }

    private function decorateLazy(string $id, DefinitionInterface $definition): DefinitionInterface
    {
        $factory = $this->getLazyLoadingValueHolderFactory();
        if (class_exists($id) || interface_exists($id)) {
            $class = $id;
        } elseif ($definition instanceof ArrayDefinition) {
            $class = $definition->getClass();
        } else {
            throw new \RuntimeException('Could not determinate object class');
        }

        return new LazyDefinitionDecorator($factory, $definition, $class);
    }

    private function getLazyLoadingValueHolderFactory(): LazyLoadingValueHolderFactory
    {
        if (!class_exists(LazyLoadingValueHolderFactory::class)) {
            throw new \RuntimeException('You should install `ocramius/proxy-manager` if you want to use lazy services.');
        }
        return $this->lazyFactory ??= new LazyLoadingValueHolderFactory();
    }
}

yiisoft / di

Pull Request — master (#232)

Container::decorateLazy() A

Complexity

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Duplication

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