Symfony without the framework

Many of us do not know the world outside frameworks - you simply have to use one to be regarded a well-rounded engineer. Symfony is one of them, a quite interesting choice if you look for very popular, actively maintained and well-engineered foundation for years to come. But there is one advantage that not many of us are aware of - the level of reusability of its components. I want to show how to build fully-featured solutions using Symfony components without relying on virtually anything that would make you think that it is a stock framework. I will show how I maintained several projects in various companies I worked for.

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1. symfony
   

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6. ➔ ➔
   

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7. ➔ ➔ ➔
   

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31. declare(strict_types=1);
    namespace X;
    use Symfony\Component\HttpFoundation\Request;
    use Thunder\Example\Application\Example\Kernel\ExampleKernel;
    require __DIR__.'/../../../vendor/autoload.php';
    require __DIR__.'/../../../var/cache/ExampleContainer.php';
    $request = Request::createFromGlobals();
    $kernel = new ExampleKernel(new \ExampleContainer());
    $response = $kernel->handle($request);
    $response->send();
    

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33. services:
    _defaults:
    autowire: false
    autoconfigure: false
    public: false
    index.controller:
    class: Thunder\Example\Application\Example\Controller\IndexController
    arguments: ['@routing']
    public: true
    routing:
    class: Symfony\Component\Routing\Router
    arguments: ['@routing.loader', 'routing.yaml', { cache_dir: '../var/cache' }]
    public: true
    routing.loader:
    class: Symfony\Component\Routing\Loader\YamlFileLoader
    arguments: ['@routing.locator']
    routing.locator:
    class: Symfony\Component\Config\FileLocator
    arguments: [['../etc']]
    

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34. declare(strict_types=1);
    namespace Thunder\Example\Application\Console\Command;
    use …;
    final class ContainerGenerateCommand extends Command
    {
    protected function configure(): void { /* … */ }
    protected function execute(InputInterface $input, OutputInterface $output): void
    {
    $yaml = $input->getOption('services');
    $target = $input->getOption('target');
    $builder = new ContainerBuilder();
    $loader = new YamlFileLoader($builder, new FileLocator(\dirname($yaml)));
    $loader->load(basename($yaml));
    $builder->compile();
    $dumper = new PhpDumper($builder);
    file_put_contents($target, $dumper->dump([
    'class' => str_replace('.php', '', basename($target)),
    ]));
    }
    }
    

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35. declare(strict_types=1);
    namespace Thunder\Example\Application\Console\Command;
    use …;
    final class RoutingGenerateCommand extends Command
    {
    protected function configure(): void { /* … */ }
    protected function execute(InputInterface $input, OutputInterface $output): void
    {
    $resource = $input->getOption('resource');
    $target = $input->getOption('target');
    $loader = new YamlFileLoader(new FileLocator([\dirname($resource)]));
    $routing = new Router($loader, basename($resource), [
    'cache_dir' => $target,
    ]);
    $routing->match('/');
    }
    }
    

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36. apps/console/bin/example container:generate
    --services=apps/example/etc/services.yaml
    --target=apps/example/var/cache/ExampleContainer.php
    apps/console/bin/example routing:generate
    --resource=apps/example/etc/routing.yaml
    --target=apps/example/var/cache
    

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37. class ExampleContainer extends Container
    {
    public function __construct()
    {
    $this->services = $this->privates = array();
    $this->methodMap = array(
    'index.controller' => 'getIndex_ControllerService',
    'routing' => 'getRoutingService',
    );
    $this->aliases = array();
    }
    protected function getIndex_ControllerService()
    {
    return $this->services['index.controller']
    = new \Thunder\Example\Application\Example\Controller\IndexController(
    ($this->services['routing'] ?? $this->getRoutingService()
    );
    }
    protected function getRoutingService()
    {
    return $this->services['routing'] = new \Symfony\Component\Routing\Router(
    new \Symfony\Component\Routing\Loader\YamlFileLoader(
    new \Symfony\Component\Config\FileLocator(array(0 => '../etc'))
    ),
    'routing.yaml',
    array('cache_dir' => '../var/cache')
    );
    }
    }
    

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39. final class ExampleKernel implements HttpKernelInterface
    {
    private $container;
    public function __construct(\AppContainer $container)
    {
    $this->container = $container;
    }
    public function handle(Request $request, $type, $catch)
    {
    // to be continued...
    }
    }
    

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40. $routing = $this->container->get('routing');
    $context = new RequestContext();
    $context->fromRequest($request);
    $routing->setContext($context);
    $route = $routing->matchRequest($request);
    $request->attributes->replace($route);
    [$ctrl, $action] = $route['controller'];
    return $container->get($ctrl)->{$action}($request);
    

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42. services:
    user.controller:
    class: Application\Web\Controller\UserController
    arguments: ['@user.repository']
    user.repository:
    alias: user.repository.doctrine
    user.repository.doctrine:
    class: Application\Web\Repository\DoctrineUserRepository
    arguments: ['@doctrine.em']
    user.repository.memory:
    class: Application\Web\Repository\MemoryUserRepository
    

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43. index.index:
    path: /
    methods: [GET]
    defaults:
    controller: [index.controller, indexAction]
    _controller: index.controller:indexAction
    user.view:
    path: /user/{id}
    methods: [GET]
    defaults:
    controller: [user.controller, viewAction]
    _controller: user.controller:viewAction
    requirements:
    id: \d+
    

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44. final class UserController
    {
    private $users;
    public function __construct(UserRepositoryInterface $users)
    {
    $this->users = $users;
    }
    public function viewAction(Request $request)
    {
    // to be continued...
    }
    }
    

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45. $id = $request->attributes->get('id');
    try {
    $user = $this->users->findById(new UserId($id));
    } catch(UserNotFoundException $e) {
    return new JsonResponse(null, Response::HTTP_NOT_FOUND);
    }
    return new JsonResponse($user->toArray(), Response::HTTP_OK);
    

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47. interface UserRepositoryInterface
    {
    public function findById(UserId $id): User;
    public function add(User $user): void
    }
    

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48. final class MemoryUserRepository implements UserRepositoryInterface
    {
    private $users = [];
    public function findById(UserId $id): User
    {
    if(false === array_key_exists($id->toString(), $this->users)) {
    throw new UserNotFoundException();
    }
    return $this->users[$id->toString()];
    }
    public function add(User $user): void
    {
    if(array_key_exists($id->toString(), $this->users)) {
    throw new DuplicateUserException();
    }
    $this->users[$user->getId()->toString()] = $user;
    }
    }
    

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49. final class DoctrineOrmUserRepository implements UserRepositoryInterface
    {
    private $em;
    public function __construct(EntityManagerInterface $em)
    {
    $this->em = $em;
    }
    public function findById(UserId $id): User
    {
    return $this->em->find(User::class, $id->toString());
    }
    public function add(User $user): void
    {
    $this->em->persist($user);
    }
    }
    

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51. Application
    ﹂src
    ﹂User
    ﹂Application
    ﹂Command
    ﹂CreateUserCommand.php
    ﹂Domain
    ﹂User.php
    ﹂UserId.php
    ﹂UserRepositoryInterface.php
    ﹂Infrastructure
    ﹂Persistence
    ﹂MemoryUserRepository.php
    ﹂DoctrineOrmUserRepository.php
    ﹂tests
    ﹂User
    ﹂Domain
    ﹂UserTest.php
    

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52. Application
    ﹂apps
    ﹂example
    ﹂etc
    ﹂routing.yaml
    ﹂services.yaml
    ﹂src
    ﹂Controller
    ﹂UserController.php
    ﹂Service
    ﹂TokenService.php
    ﹂Kernel
    ﹂ExampleKernel.php
    ﹂web
    ﹂app.php
    

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53. Application
    ﹂apps
    ﹂console
    ﹂bin
    ﹂example
    ﹂src
    ﹂Command
    ﹂ContainerGenerateCommand.php
    ﹂RoutingGenerateCommand.php
    

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54. Application
    ﹂apps
    ﹂example
    ﹂features
    ﹂user-auth.feature
    ﹂tests
    ﹂UserTest.php
    ﹂var
    ﹂cache
    ﹂router.php
    ﹂container.php
    ﹂logs
    ﹂error.log
    

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57. Library
    ﹂src
    ﹂Provider
    ﹂ProviderInterface.php
    ﹂AgnosticProvider.php
    ﹂Agnostic.php
    ﹂tests
    ﹂AgnosticTest.php
    

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59. Library
    ﹂bundle
    ﹂etc
    ﹂services.yaml
    ﹂src
    ﹂DependencyInjection
    ﹂Configuration.php
    ﹂AgnosticExtension.php
    ﹂AgnosticBundle.php
    ﹂tests
    ﹂AgnosticBundleTest.php
    

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60. {
    // ...
    "autoload": {
    "psr-4": {
    "Thunder\\Agnostic\\": "src",
    "Thunder\\Agnostic\\Tests\\": "tests",
    "Thunder\\AgnosticBundle\\": "bundle"
    }
    }
    // ...
    }
    

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71. Resources
    Images
    

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