Callback argument resolver

Provide a callback argument resolver interface and implementation, very similar to symfony/http-kernel's ArgumentResolver class implementation, but usable out of Symfony project and HTTP context.

This API does not depend upon any other, and has copy-pasted some code from the Symfony component:

This choice has been made because Symfony's code hardwires the Request object dependency as a part of its API where we need to be able to use this API out of the HTTP context.
This makes this component resilient to Symfony code changes in the long term and simplifies maintainance.

1.0 Roadmap

API basics
Retrieve features from makinacorpus/access-control
Basic Symfony bundle
Service argument value resolver

Get started

Installation

Install it using composer:

composer require makinacorpus/argument-resolver

As Symfony bundle setup

Then add to your config/bundles.php file:

<?php

return [
    // ... Your other bundles.
    MakinaCorpus\ArgumentResolver\Bridge\Symfony\ArgumentResolverBundle::class => ['all' => true],
];

Basic usage

Consider the following function:

namespace Some\Namespace;

function foo(int $bar, ?int $foo, string $fizz = 'foo', \DateTime ...$dates): void
{
    // Do something.
}

This will reconciliate arguments from argument value resolvers:

use MakinaCorpus\ArgumentResolver\Context\ArrayResolverContext;
use MakinaCorpus\ArgumentResolver\DefaultArgumentResolver;

$callback = '\\Some\\Namespace\\foo';

$argumentResolver = new DefaultArgumentResolver();

$arguments = $argumentResolver->getArguments(
    $callback,
    new ArrayResolverContext(
        [
            'bar' => 12,
        ]
    )
);

echo ($callback)(...$arguments);
// 12

And that's it. This has no real added value as-is, but it becomes handy when working with dynamic service method calls in a large complex app.

Symfony integration

Basics

More than one argument resolver can coexist in container, each one will have a dedicated string identifier, for example:

when using makinacorpus/access-control, the access-control argument resolver will be created,
when using makinacorpus/corebus, the corebus argument resolver will be created.

For plugging in custom value resolver, there is two different tags:

use the custom.argument_resolver.default tag for registering a value resolver to all argument resolvers,
use the custom.argument_resolver.NAME tag, where NAME is one of the argument resolver identifiers for register a given value converter.

Define a new argument resolver

Whatever situation is yours, creating a new resolver in a project, or in a custom bundle, you must add a new service using the argument_resolver tag to define a new service, such as:

services:
    # ... your other services
    my_custom_bundle.argument_resolver:
        class: MakinaCorpus\ArgumentResolver\DefaultArgumentResolver
        tags: [{ name: 'custom.argument_resolver', id: 'my_custom_name' }]

You may also want to provide some additional custom value resolvers:

services:
    # ... your other services
    MyCustomBundle\ArgumentResolver\Resolver\FooValueResolver:
        tags: ['custom.argument_resolver.my_custom_name']

Notice that the name after the last . in the custom.argument_resolver.my_custom_name string refers to the argument resolver id attribute.

In your services, use the my_custom_bundle.argument_resolver service for injection, since you defined for your own usage.

Some compiler passes will do the hard job of autowiring anything that needs to be autowired for you.

makinacorpus / argument-resolver