Silex: An implementation detail

Joint talk with Dave Marshall.

Transcript

1. View Slide

2. View Slide

3. View Slide

4. View Slide

5. View Slide

6. View Slide

7. View Slide

8. View Slide

9. require_once __DIR__.'/../vendor/autoload.php';
   $app = new Silex\Application();
   $app->get('/hello/{name}', function ($name) use ($app) {
   return 'Hello '.$app->escape($name);
   });
   $app->run();
   

   View Slide

10. $app['some_service'] = $app->share(
    function ($app) {
    return new SomeService($app['other_service']);
    }
    );
    

    View Slide

11. View Slide

12. View Slide

13. View Slide

14. Scenario: Place bid on a running auction
    Given there is an auction for some "Glasses"
    And I am a registered user
    And I am on "/"
    When I follow "Login"
    And I fill in "email" with "dave@example.com"
    And I fill in "password" with "password"
    And I press "Login"
    And I follow "Glasses"
    And I fill in "amount" with "10.00"
    And I select "USD" from "currency"
    And I press "Place Bid"
    Then I should see "Bid Accepted"
    

    View Slide

15. View Slide

16. Scenario: Place bid on a running auction
    Given there is a running auction
    And I am viewing the auction
    When I place a bid on the auction
    Then I should see my bid is accepted
    

    View Slide

17. View Slide

18. View Slide

19. View Slide

20. View Slide

21. class BidRequest
    {
    public $auctionId;
    public $userId;
    public $amount;
    public function __construct($auctionId, $userId, Money $amount)
    {
    $this->auctionId = $auctionId;
    $this->userId = $userId;
    $this->amount = $amount;
    }
    }
    

    View Slide

22. class BidResponse
    {
    public $bid;
    public function __construct(BidValue $bid)
    {
    $this->bid = $bid;
    }
    }
    

    View Slide

23. $interactor = new BidInteractor();
    $request = new BidRequest(
    $auctionId,
    $userId,
    new Money($amount)
    );
    $response = $interactor($request);
    

    View Slide

24. View Slide

25. View Slide

26. namespace Douche\Interactor;
    class Bid
    {
    public function __invoke(BidRequest $request)
    {
    $auction = $this->auctionRepo->find($request->auctionId);
    $user = $this->userRepo->find($request->userId);
    $converted = $this->converter->convert(
    $request->amount,
    $auction->getCurrency()
    );
    $bid = new BidValue($converted, $request->amount);
    $auction->bid($user, $bid);
    return new BidResponse($bid);
    }
    }
    

    View Slide

27. View Slide

28. class Auction
    {
    public function getId();
    public function getName();
    public function getCurrency();
    public function getEndingAt();
    public function getHighestBid();
    public function getHighestBidder();
    public function isRunning(DateTime $now = null);
    public function bid(User $bidder, Bid $bid,
    DateTime $now = null);
    }
    

    View Slide

29. public function bid(User $bidder, Bid $bid, DateTime $now = null)
    {
    if (!$this->isRunning($now)) {
    throw new AuctionClosedException();
    }
    $highestBid = $this->getHighestBid();
    if ($highestBid && $bid->getAmount() <= $highestBid->getAmount()) {
    throw new BidTooLowException();
    }
    $this->bids[] = [$bidder, $bid];
    }
    

    View Slide

30. View Slide

31. View Slide

32. View Slide

33. View Slide

34. View Slide

35. $app->get('/auction/{id}', ...)
    ->convert('request', function ($_, Request $req) {
    return new AuctionViewRequest(
    $req->attributes->get('id')
    );
    });
    

    View Slide

36. $app->get('/auction/{id}', 'interactor.auction_view')
    

    View Slide

37. public function getController(Request $req)
    {
    $controller = $req->attributes->get('_controller');
    if (!is_string($controller)
    || !isset($this->container[$controller])) {
    return $this->resolver->getController($req);
    }
    if (!is_callable($this->container[$controller])) {
    throw new \InvalidArgumentException("...");
    }
    return $this->container[$controller];
    }
    

    View Slide

38. $app['resolver'] = $app->share(
    $app->extend('resolver', function ($resolver, $app) {
    $resolver = new ControllerResolver(
    $resolver,
    $app
    );
    return $resolver;
    })
    );
    

    View Slide

39. $dispatcher->addListener(KernelEvents::VIEW, function
    ($event) use ($app) {
    $view = $event->getControllerResult();
    $request = $event->getRequest();
    $controller = $request->attributes->get('controller');
    $template = "$controller.html";
    $body = $app['mustache']->render($template, $view);
    $response = new Response($body);
    $event->setResponse($response);
    });
    

    View Slide

40. View Slide

41. {{> _header.html }}
    {{ auction.name }}
    Ends: {{ auction.endingAt | format_date }}
    {{# auction.highestBid }}
    Highest bid: {{ getAmount | format_money }}
    {{/ auction.highestBid }}
    {{# auction.highestBidder }}
    Highest bidder: {{ . }}
    {{/ auction.highestBidder }}
    

    View Slide

42. $app->get('/auction/{id}', 'interactor.auction_view')
    ->value('success_handler', function ($view, $req) {
    return new RedirectResponse(
    "/auction/"
    . $request->attributes->get("id")
    );
    });
    

    View Slide

43. if ($request->attributes->has('success_handler')) {
    $fn = $request->attributes->get('success_handler');
    $view = $fn($view, $request);
    if ($view instanceof Response) {
    $event->setResponse($view);
    return;
    }
    }
    

    View Slide

44. $app->post('/login', 'interactor.user_login')
    ->value('error_handlers', [
    "IncorrectPasswordException" => function () {
    return ['errors' => [
    'Invalid Credentials',
    ]];
    },
    ]);
    

    View Slide

45. $app->error(function (DoucheException $e, $code)
    use ($app) {
    $handlers = $app['request']
    ->attributes
    ->get('error_handlers', []);
    foreach ($handlers as $type => $handler) {
    if ($e instanceof $type) {
    return $handler(
    $e,
    $code,
    $app['request']
    );
    }
    }
    });
    

    View Slide

46. namespace DoucheWeb;
    use Douche\Interactor\AuctionListResponse;
    use Douche\Interactor\AuctionViewRequest;
    use Douche\Interactor\UserLoginRequest;
    use Douche\Interactor\UserLoginResponse;
    use Douche\Interactor\AuctionViewResponse;
    use Douche\Interactor\BidRequest;
    use Douche\Exception\Exception as DoucheException;
    use Mustache\Silex\Provider\MustacheServiceProvider;
    use Silex\Application;
    use Silex\Provider\DoctrineServiceProvider;
    use Silex\Provider\MonologServiceProvider;
    use Silex\Provider\ServiceControllerServiceProvider;
    use Silex\Provider\SessionServiceProvider;
    use Silex\ExceptionListenerWrapper;
    use Symfony\Component\HttpFoundation\Request;
    use Symfony\Component\HttpFoundation\Response;
    use Symfony\Component\HttpFoundation\RedirectResponse;
    use Symfony\Component\HttpKernel\KernelEvents;
    use Money\Money;
    use Money\Currency;
    $app = new Application();
    $app->register(new MonologServiceProvider());
    $app->register(new DoctrineServiceProvider());
    $app->register(new MustacheServiceProvider(), [
    'mustache.options' => [
    'helpers' => [
    'format_money' => function ($money) {
    return $money->getCurrency().' '.($money->getAmount() / 100);
    },
    'format_date' => function (\DateTime $date) {
    return $date->format("Y-m-d H:i:s");
    },
    ],
    ],
    ]);
    $app->register(new ServiceControllerServiceProvider());
    $app->register(new SessionServiceProvider());
    $app->register(new ServiceProvider());
    $app->get('/', 'interactor.auction_list')
    ->value('controller', 'auction_list');
    $app->get('/auction/{id}', 'interactor.auction_view')
    ->value('controller', 'auction_view')
    ->convert('request', function ($_, Request $request) {
    return new AuctionViewRequest($request->attributes->get('id'));
    });
    $app->post('/auction/{id}/bids', 'interactor.bid')
    ->before(function (Request $request, Application $app) {
    if (!$request->getSession()->has('current_user')) {
    return $app->abort(401, 'Authenitcation Required');
    }
    })
    ->value('controller', 'bid')
    ->value('success_handler', function ($view, $request) {
    return new RedirectResponse("/auction/" . $request->attributes->get('id'));
    })
    ->value('error_handlers', [
    "Douche\Exception\BidTooLowException" => function ($e, $code, $request) {
    $request->getSession()->getFlashBag()->set('errors', [
    'The provided bid was too low.',
    ]);
    return new RedirectResponse("/auction/" . $request->attributes->get('id'));
    },
    ])
    ->convert('request', function ($_, Request $request) {
    return new BidRequest(
    $request->attributes->get('id'),
    $request->getSession()->get('current_user')->id,
    new Money((int) $request->request->get('amount') * 100, new Currency($request->request->get('currency')))
    );
    });
    $app->post('/login', 'interactor.user_login')
    ->value('controller', 'login')
    ->value('success_handler', function ($view, $request) {
    $request->getSession()->set('current_user', $view->user);
    return new RedirectResponse("/");
    })
    ->value('error_handlers', [
    "Douche\Exception\UserNotFoundException" => function ($e) {
    return [
    'errors' => ['Incorrect email provided.'],
    'email' => $e->email,
    ];
    },
    "Douche\Exception\IncorrectPasswordException" => function ($e) {
    return [
    'errors' => ['Invalid credentials provided.'],
    'email' => $e->email,
    ];
    },
    ])
    ->convert('request', function ($_, Request $request) {
    return new UserLoginRequest($request->request->all());
    });
    $app->get('/login', function(Request $request, Application $app) {
    $view = [
    'errors' => [],
    ];
    return $app['mustache']->render('login.html.mustache', $view);
    });
    $app->get('/logout', function(Request $request, Application $app) {
    $request->getSession()->start();
    $request->getSession()->invalidate();
    return $app->redirect("/");
    });
    $app['resolver'] = $app->share($app->extend('resolver', function ($resolver, $app) {
    $resolver = new ControllerResolver($resolver, $app);
    return $resolver;
    }));
    // TODO change to ->error once fabpot/silex#705 is merged
    $app['dispatcher'] = $app->share($app->extend('dispatcher', function ($dispatcher, $app) {
    $dispatcher->addListener(KernelEvents::EXCEPTION, new ExceptionListenerWrapper($app, function (DoucheException $e, $code) use ($app) {
    $app['request']->attributes->set('failed', true);
    $errorHandlers = $app['request']->attributes->get('error_handlers', []);
    foreach ($errorHandlers as $type => $handler) {
    if ($e instanceof $type) {
    return $handler($e, $code, $app['request']);
    }
    }
    }), -8);
    return $dispatcher;
    }));
    // TODO change to ->on once fabpot/silex#705 is merged
    $app['dispatcher'] = $app->share($app->extend('dispatcher', function ($dispatcher, $app) {
    $dispatcher->addListener(KernelEvents::VIEW, function ($event) use ($app) {
    $view = $event->getControllerResult();
    if (is_null($view) || is_string($view)) {
    return;
    }
    $request = $event->getRequest();
    if (!$request->attributes->get('failed') && $request->attributes->has('success_handler')) {
    $handler = $request->attributes->get('success_handler');
    $view = $handler($view, $request);
    if ($view instanceof Response) {
    $event->setResponse($view);
    return;
    }
    }
    $controller = $request->attributes->get('controller');
    $template = "$controller.html";
    $view = (object) $view;
    $view->current_user = $request->getSession()->get('current_user');
    $view->form_errors = $request->getSession()->getFlashBag()->get('errors');
    $body = $app['mustache']->render($template, $view);
    $response = new Response($body);
    $event->setResponse($response);
    });
    return $dispatcher;
    }));
    // TODO change to ->after once fabpot/silex#705 is merged
    $app['dispatcher'] = $app->share($app->extend('dispatcher', function ($dispatcher, $app) {
    $dispatcher->addListener(KernelEvents::RESPONSE, function () use ($app) {
    $app['douche.auction_repo']->save();
    });
    return $dispatcher;
    }));
    return $app;
    service providers
    routes
    listeners
    

    View Slide

47. View Slide

48. View Slide

49. /**
    * @When /^I place a bid on the auction$/
    */
    public function iPlaceABidOnTheAuction()
    {
    $this->auctionHelper->placeBid(1.0);
    }
    

    View Slide

50. public function placeBid($amount)
    {
    $interactor = new BidInteractor(
    $this->getAuctionRepository()
    );
    $request = new BidRequest(
    $this->auction->getId(),
    $this->getCurrentUserId(),
    $amount
    );
    $this->response = $interactor($request);
    }
    

    View Slide

51. public function placeBid($amount)
    {
    $page = $this->mink->getSession()->getPage();
    $page->fillField('amount', $amount);
    $page->pressButton("Place Bid");
    }
    

    View Slide

52. View Slide

53. View Slide

54. View Slide

55. View Slide

56. View Slide