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<?php
/*
* This file is part of the Symfony package.
*
* (c) Fabien Potencier <fabien@symfony.com>
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
namespace Symfony\Component\DependencyInjection\Compiler;
use Symfony\Component\Config\Resource\ClassExistenceResource;
use Symfony\Component\DependencyInjection\ContainerBuilder;
use Symfony\Component\DependencyInjection\Definition;
use Symfony\Component\DependencyInjection\Exception\AutowiringFailedException;
use Symfony\Component\DependencyInjection\Exception\RuntimeException;
use Symfony\Component\DependencyInjection\LazyProxy\ProxyHelper;
use Symfony\Component\DependencyInjection\TypedReference;
/**
* Inspects existing service definitions and wires the autowired ones using the type hints of their classes.
*
* @author Kévin Dunglas <dunglas@gmail.com>
* @author Nicolas Grekas <p@tchwork.com>
*/
class AutowirePass extends AbstractRecursivePass
{
private $types;
private $ambiguousServiceTypes;
private $lastFailure;
private $throwOnAutowiringException;
private $decoratedClass;
private $decoratedId;
private $methodCalls;
private $getPreviousValue;
private $decoratedMethodIndex;
private $decoratedMethodArgumentIndex;
public function __construct(bool $throwOnAutowireException = true)
{
$this->throwOnAutowiringException = $throwOnAutowireException;
}
/**
* {@inheritdoc}
*/
public function process(ContainerBuilder $container)
{
try {
parent::process($container);
} finally {
$this->types = null;
$this->ambiguousServiceTypes = null;
$this->decoratedClass = null;
$this->decoratedId = null;
$this->methodCalls = null;
$this->getPreviousValue = null;
$this->decoratedMethodIndex = null;
$this->decoratedMethodArgumentIndex = null;
}
}
/**
* {@inheritdoc}
*/
protected function processValue($value, $isRoot = false)
{
try {
return $this->doProcessValue($value, $isRoot);
} catch (AutowiringFailedException $e) {
if ($this->throwOnAutowiringException) {
throw $e;
}
$this->container->getDefinition($this->currentId)->addError($e->getMessageCallback() ?? $e->getMessage());
return parent::processValue($value, $isRoot);
}
}
private function doProcessValue($value, $isRoot = false)
{
if ($value instanceof TypedReference) {
if ($ref = $this->getAutowiredReference($value)) {
return $ref;
}
if (ContainerBuilder::RUNTIME_EXCEPTION_ON_INVALID_REFERENCE === $value->getInvalidBehavior()) {
$message = $this->createTypeNotFoundMessageCallback($value, 'it');
// since the error message varies by referenced id and $this->currentId, so should the id of the dummy errored definition
$this->container->register($id = sprintf('.errored.%s.%s', $this->currentId, (string) $value), $value->getType())
->addError($message);
return new TypedReference($id, $value->getType(), $value->getInvalidBehavior(), $value->getName());
}
}
$value = parent::processValue($value, $isRoot);
if (!$value instanceof Definition || !$value->isAutowired() || $value->isAbstract() || !$value->getClass()) {
return $value;
}
if (!$reflectionClass = $this->container->getReflectionClass($value->getClass(), false)) {
$this->container->log($this, sprintf('Skipping service "%s": Class or interface "%s" cannot be loaded.', $this->currentId, $value->getClass()));
return $value;
}
$this->methodCalls = $value->getMethodCalls();
try {
$constructor = $this->getConstructor($value, false);
} catch (RuntimeException $e) {
throw new AutowiringFailedException($this->currentId, $e->getMessage(), 0, $e);
}
if ($constructor) {
array_unshift($this->methodCalls, [$constructor, $value->getArguments()]);
}
$this->methodCalls = $this->autowireCalls($reflectionClass, $isRoot);
if ($constructor) {
list(, $arguments) = array_shift($this->methodCalls);
if ($arguments !== $value->getArguments()) {
$value->setArguments($arguments);
}
}
if ($this->methodCalls !== $value->getMethodCalls()) {
$value->setMethodCalls($this->methodCalls);
}
return $value;
}
/**
* @param \ReflectionClass $reflectionClass
*
* @return array
*/
private function autowireCalls(\ReflectionClass $reflectionClass, bool $isRoot): array
{
$this->decoratedId = null;
$this->decoratedClass = null;
$this->getPreviousValue = null;
if ($isRoot && ($definition = $this->container->getDefinition($this->currentId)) && $this->container->has($this->decoratedId = $definition->innerServiceId)) {
$this->decoratedClass = $this->container->findDefinition($this->decoratedId)->getClass();
}
foreach ($this->methodCalls as $i => $call) {
$this->decoratedMethodIndex = $i;
list($method, $arguments) = $call;
if ($method instanceof \ReflectionFunctionAbstract) {
$reflectionMethod = $method;
} else {
$definition = new Definition($reflectionClass->name);
try {
$reflectionMethod = $this->getReflectionMethod($definition, $method);
} catch (RuntimeException $e) {
if ($definition->getFactory()) {
continue;
}
throw $e;
}
}
$arguments = $this->autowireMethod($reflectionMethod, $arguments);
if ($arguments !== $call[1]) {
$this->methodCalls[$i][1] = $arguments;
}
}
return $this->methodCalls;
}
/**
* Autowires the constructor or a method.
*
* @return array The autowired arguments
*
* @throws AutowiringFailedException
*/
private function autowireMethod(\ReflectionFunctionAbstract $reflectionMethod, array $arguments): array
{
$class = $reflectionMethod instanceof \ReflectionMethod ? $reflectionMethod->class : $this->currentId;
$method = $reflectionMethod->name;
$parameters = $reflectionMethod->getParameters();
if ($reflectionMethod->isVariadic()) {
array_pop($parameters);
}
foreach ($parameters as $index => $parameter) {
if (\array_key_exists($index, $arguments) && '' !== $arguments[$index]) {
continue;
}
$type = ProxyHelper::getTypeHint($reflectionMethod, $parameter, true);
if (!$type) {
if (isset($arguments[$index])) {
continue;
}
// no default value? Then fail
if (!$parameter->isDefaultValueAvailable()) {
// For core classes, isDefaultValueAvailable() can
// be false when isOptional() returns true. If the
// argument *is* optional, allow it to be missing
if ($parameter->isOptional()) {
continue;
}
$type = ProxyHelper::getTypeHint($reflectionMethod, $parameter, false);
$type = $type ? sprintf('is type-hinted "%s"', ltrim($type, '\\')) : 'has no type-hint';
throw new AutowiringFailedException($this->currentId, sprintf('Cannot autowire service "%s": argument "$%s" of method "%s()" %s, you should configure its value explicitly.', $this->currentId, $parameter->name, $class !== $this->currentId ? $class.'::'.$method : $method, $type));
}
// specifically pass the default value
$arguments[$index] = $parameter->getDefaultValue();
continue;
}
$getValue = function () use ($type, $parameter, $class, $method) {
if (!$value = $this->getAutowiredReference($ref = new TypedReference($type, $type, ContainerBuilder::EXCEPTION_ON_INVALID_REFERENCE, $parameter->name))) {
$failureMessage = $this->createTypeNotFoundMessageCallback($ref, sprintf('argument "$%s" of method "%s()"', $parameter->name, $class !== $this->currentId ? $class.'::'.$method : $method));
if ($parameter->isDefaultValueAvailable()) {
$value = $parameter->getDefaultValue();
} elseif (!$parameter->allowsNull()) {
throw new AutowiringFailedException($this->currentId, $failureMessage);
}
}
return $value;
};
if ($this->decoratedClass && $isDecorated = is_a($this->decoratedClass, $type, true)) {
if ($this->getPreviousValue) {
// The inner service is injected only if there is only 1 argument matching the type of the decorated class
// across all arguments of all autowired methods.
// If a second matching argument is found, the default behavior is restored.
$getPreviousValue = $this->getPreviousValue;
$this->methodCalls[$this->decoratedMethodIndex][1][$this->decoratedMethodArgumentIndex] = $getPreviousValue();
$this->decoratedClass = null; // Prevent further checks
} else {
$arguments[$index] = new TypedReference($this->decoratedId, $this->decoratedClass);
$this->getPreviousValue = $getValue;
$this->decoratedMethodArgumentIndex = $index;
continue;
}
}
$arguments[$index] = $getValue();
}
if ($parameters && !isset($arguments[++$index])) {
while (0 <= --$index) {
$parameter = $parameters[$index];
if (!$parameter->isDefaultValueAvailable() || $parameter->getDefaultValue() !== $arguments[$index]) {
break;
}
unset($arguments[$index]);
}
}
// it's possible index 1 was set, then index 0, then 2, etc
// make sure that we re-order so they're injected as expected
ksort($arguments);
return $arguments;
}
/**
* @return TypedReference|null A reference to the service matching the given type, if any
*/
private function getAutowiredReference(TypedReference $reference)
{
$this->lastFailure = null;
$type = $reference->getType();
if ($type !== (string) $reference) {
return $reference;
}
if (null !== $name = $reference->getName()) {
if ($this->container->has($alias = $type.' $'.$name) && !$this->container->findDefinition($alias)->isAbstract()) {
return new TypedReference($alias, $type, $reference->getInvalidBehavior());
}
if ($this->container->has($name) && !$this->container->findDefinition($name)->isAbstract()) {
foreach ($this->container->getAliases() as $id => $alias) {
if ($name === (string) $alias && 0 === strpos($id, $type.' $')) {
return new TypedReference($name, $type, $reference->getInvalidBehavior());
}
}
}
}
if ($this->container->has($type) && !$this->container->findDefinition($type)->isAbstract()) {
return new TypedReference($type, $type, $reference->getInvalidBehavior());
}
}
/**
* Populates the list of available types.
*/
private function populateAvailableTypes(ContainerBuilder $container)
{
$this->types = [];
$this->ambiguousServiceTypes = [];
foreach ($container->getDefinitions() as $id => $definition) {
$this->populateAvailableType($container, $id, $definition);
}
}
/**
* Populates the list of available types for a given definition.
*/
private function populateAvailableType(ContainerBuilder $container, string $id, Definition $definition)
{
// Never use abstract services
if ($definition->isAbstract()) {
return;
}
if ('' === $id || '.' === $id[0] || $definition->isDeprecated() || !$reflectionClass = $container->getReflectionClass($definition->getClass(), false)) {
return;
}
foreach ($reflectionClass->getInterfaces() as $reflectionInterface) {
$this->set($reflectionInterface->name, $id);
}
do {
$this->set($reflectionClass->name, $id);
} while ($reflectionClass = $reflectionClass->getParentClass());
}
/**
* Associates a type and a service id if applicable.
*/
private function set(string $type, string $id)
{
// is this already a type/class that is known to match multiple services?
if (isset($this->ambiguousServiceTypes[$type])) {
$this->ambiguousServiceTypes[$type][] = $id;
return;
}
// check to make sure the type doesn't match multiple services
if (!isset($this->types[$type]) || $this->types[$type] === $id) {
$this->types[$type] = $id;
return;
}
// keep an array of all services matching this type
if (!isset($this->ambiguousServiceTypes[$type])) {
$this->ambiguousServiceTypes[$type] = [$this->types[$type]];
unset($this->types[$type]);
}
$this->ambiguousServiceTypes[$type][] = $id;
}
private function createTypeNotFoundMessageCallback(TypedReference $reference, $label)
{
$container = new ContainerBuilder($this->container->getParameterBag());
$container->setAliases($this->container->getAliases());
$container->setDefinitions($this->container->getDefinitions());
$container->setResourceTracking(false);
return function () use ($container, $reference, $label) {
return $this->createTypeNotFoundMessage($container, $reference, $label);
};
}
private function createTypeNotFoundMessage(ContainerBuilder $container, TypedReference $reference, $label)
{
if (!$r = $container->getReflectionClass($type = $reference->getType(), false)) {
// either $type does not exist or a parent class does not exist
try {
$resource = new ClassExistenceResource($type, false);
// isFresh() will explode ONLY if a parent class/trait does not exist
$resource->isFresh(0);
$parentMsg = false;
} catch (\ReflectionException $e) {
$parentMsg = $e->getMessage();
}
$message = sprintf('has type "%s" but this class %s.', $type, $parentMsg ? sprintf('is missing a parent class (%s)', $parentMsg) : 'was not found');
} else {
$alternatives = $this->createTypeAlternatives($container, $reference);
$message = $container->has($type) ? 'this service is abstract' : 'no such service exists';
$message = sprintf('references %s "%s" but %s.%s', $r->isInterface() ? 'interface' : 'class', $type, $message, $alternatives);
if ($r->isInterface() && !$alternatives) {
$message .= ' Did you create a class that implements this interface?';
}
}
$message = sprintf('Cannot autowire service "%s": %s %s', $this->currentId, $label, $message);
if (null !== $this->lastFailure) {
$message = $this->lastFailure."\n".$message;
$this->lastFailure = null;
}
return $message;
}
private function createTypeAlternatives(ContainerBuilder $container, TypedReference $reference)
{
// try suggesting available aliases first
if ($message = $this->getAliasesSuggestionForType($container, $type = $reference->getType())) {
return ' '.$message;
}
if (null === $this->ambiguousServiceTypes) {
$this->populateAvailableTypes($container);
}
$servicesAndAliases = $container->getServiceIds();
if (!$container->has($type) && false !== $key = array_search(strtolower($type), array_map('strtolower', $servicesAndAliases))) {
return sprintf(' Did you mean "%s"?', $servicesAndAliases[$key]);
} elseif (isset($this->ambiguousServiceTypes[$type])) {
$message = sprintf('one of these existing services: "%s"', implode('", "', $this->ambiguousServiceTypes[$type]));
} elseif (isset($this->types[$type])) {
$message = sprintf('the existing "%s" service', $this->types[$type]);
} else {
return;
}
return sprintf(' You should maybe alias this %s to %s.', class_exists($type, false) ? 'class' : 'interface', $message);
}
private function getAliasesSuggestionForType(ContainerBuilder $container, $type, $extraContext = null)
{
$aliases = [];
foreach (class_parents($type) + class_implements($type) as $parent) {
if ($container->has($parent) && !$container->findDefinition($parent)->isAbstract()) {
$aliases[] = $parent;
}
}
$extraContext = $extraContext ? ' '.$extraContext : '';
if (1 < $len = \count($aliases)) {
$message = sprintf('Try changing the type-hint%s to one of its parents: ', $extraContext);
for ($i = 0, --$len; $i < $len; ++$i) {
$message .= sprintf('%s "%s", ', class_exists($aliases[$i], false) ? 'class' : 'interface', $aliases[$i]);
}
$message .= sprintf('or %s "%s".', class_exists($aliases[$i], false) ? 'class' : 'interface', $aliases[$i]);
return $message;
}
if ($aliases) {
return sprintf('Try changing the type-hint%s to "%s" instead.', $extraContext, $aliases[0]);
}
}
}
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