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[DI] Deprecate/remove autowiring "auto-create" Definition functionality #23350

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[DI] Deprecate/remove autowiring "auto-create" Definition functionality#23350
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DependencyInjectionDeprecation
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3.4
@weaverryan

Description

@weaverryan
weaverryan
opened on Jul 2, 2017
Q A
Bug report? No
Feature request? No
BC Break report? no
RFC? No
Symfony version 3.4.0

The current autowiring behavior is:

If there is not a service whose id exactly matches the type AND there are 0 services in the container that have the type, a new, private, autowired service is auto-registered in the container and used for that argument.

In #22295, @nicolas-grekas proposed removing this. But, we decided not to, because it meant that all services would need to be explicitly wired. But with the PSR-4 service loader, that's not true anymore.

We should deprecate this "auto-registration" functionality from AutowirePass (

symfony/src/Symfony/Component/DependencyInjection/Compiler/AutowirePass.php

Lines 422 to 461 in d7992dc

/**
* Registers a definition for the type if possible or throws an exception.
*
* @param string $type
*
* @return TypedReference|null A reference to the registered definition
*/
private function createAutowiredDefinition($type)
{
if (!($typeHint = $this->container->getReflectionClass($type)) || !$typeHint->isInstantiable()) {
return;
}
$currentId = $this->currentId;
$this->currentId = $type;
$this->autowired[$type] = $argumentId = sprintf('autowired.%s', $type);
$argumentDefinition = new Definition($type);
$argumentDefinition->setPublic(false);
$argumentDefinition->setAutowired(true);
try {
$originalThrowSetting = $this->throwOnAutowiringException;
$this->throwOnAutowiringException = true;
$this->processValue($argumentDefinition, true);
$this->container->setDefinition($argumentId, $argumentDefinition);
} catch (AutowiringFailedException $e) {
$this->autowired[$type] = false;
$this->lastFailure = $e->getMessage();
$this->container->log($this, $this->lastFailure);
return;
} finally {
$this->throwOnAutowiringException = $originalThrowSetting;
$this->currentId = $currentId;
}
$this->container->log($this, sprintf('Type "%s" has been auto-registered for service "%s".', $type, $this->currentId));
return new TypedReference($argumentId, $type);
}
) and throw an exception in 4.0.

This "auto-registration" in AutowirePass is problematic because we can't apply instanceof to those definitions... which is a bit unexpected. Removing it also simplifies the autowiring logic: there's one less case to explain. I chatted with @dunglas about this already (https://twitter.com/dunglas/status/881557361042894849).

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