How to make LoggerInterface service public in symfony 4

问题

I want to have Psr\Log\LoggerInterface public in symfony to be able to get it directly from the container with $container->get('Psr\Log\LoggerInterface').

I tried the following services.yaml:

_defaults:
 public: true

Psr\Log\LoggerInterface:
 public: true

Psr\Log\LoggerInterface:
 alias: 'logger'
 public: true

Psr\Log\LoggerInterface:
 alias: 'monolog.logger'
 public: true

I can not get a clue why it is so hard to rewrite a service.

回答1:

As previously noted, directly accessing services from the container is discouraged. But I was a bit curious to see how to make a private service public. I tried what was listed in the question and confirmed it did not work.

This may not be the simplest approach but a compiler pass will do the trick:

# src/Kernel.php
# Make the kernel a compiler pass
use Psr\Log\LoggerInterface;
use Symfony\Component\DependencyInjection\Compiler\CompilerPassInterface;
class Kernel extends BaseKernel implements CompilerPassInterface
...
public function process(ContainerBuilder $container)
{
    $logger = $container->getAlias(LoggerInterface::class);
    $logger->setPublic(true);
}

# And that should do the trick, you can confirm with
bin/console debug:container Psr\Log\LoggerInterface

Be aware that only services which have the complete container injected will be able to take advantage of this. Controllers which extend from AbstractController only have access to a small number of services.

Take a look at Service Subscribers if you need the logger in your controller or if you just want a "better" way of doing this.

回答2:

Using $container->get() is a bad practise. It violates many good software design principles.

You should use constructor injection instead.

class Foo
{
    protected $logger;

    public function __construct(LoggerInterface $logger)
    {
        $this->logger = $logger;
    }
}

来源：https://stackoverflow.com/questions/55042137/how-to-make-loggerinterface-service-public-in-symfony-4

标签

symfony