Lottoclient Bundle Laravel Package

Getting Started

Minimal Steps

1. Installation:

   composer require dwr/lottoclient-bundle
   

   Verify the package appears in vendor/dwr/lottoclient-bundle.

2. Enable Bundle: Add to config/bundles.php (Symfony 4+):

   return [
       // ...
       Dwr\LottoClientBundle\DwrLottoClientBundle::class => ['all' => true],
   ];
   

3. First Use Case: Fetch lottery results in a controller:

   use Dwr\LottoClientBundle\Service\LottoService;
   
   class LottoController extends AbstractController
   {
       public function showResults(LottoService $lottoService)
       {
           $results = $lottoService->getLottoResults();
           return $this->render('lotto/results.html.twig', ['results' => $results]);
       }
   }
   

Where to Look First

• Service Layer: src/Service/LottoService.php – Core logic for fetching data.
• Configuration: Check config/packages/dwr_lotto_client.yaml (if exists) for customizable settings.
• Tests: tests/ for usage examples and edge cases.

Implementation Patterns

Core Workflows

1. Dependency Injection: Inject LottoService into controllers/services to fetch data:

   public function __construct(private LottoService $lottoService) {}
   

2. Data Transformation: Use the service to parse raw responses into structured arrays:

   $draws = $lottoService->getDrawHistory(5); // Last 5 draws
   

3. Caching: Implement Symfony’s cache system (e.g., CacheInterface) to store responses:

   $cache = $this->get('cache.app');
   $cachedResults = $cache->get('lotto_results');
   if (!$cachedResults) {
       $cachedResults = $lottoService->getLottoResults();
       $cache->set('lotto_results', $cachedResults, 3600); // Cache for 1 hour
   }
   

4. Event-Driven Updates: Dispatch events when data is fetched (e.g., LottoResultsFetchedEvent):

   $event = new LottoResultsFetchedEvent($results);
   $this->get('event_dispatcher')->dispatch($event, 'lotto.results.fetched');
   

Integration Tips

• Twig Templates: Pass structured data to templates for rendering:

  {% for draw in results %}
      <div>{{ draw.number }}: {{ draw.winningNumbers|join(', ') }}</div>
  {% endfor %}
  

• API Endpoints: Expose lottery data via API Platform or FOSRestBundle:

  # config/routes.yaml
  app_lotto_results:
      path: /api/lotto
      controller: Dwr\LottoClientBundle\Controller\LottoApiController::getResults
  

• Scheduled Tasks: Use Symfony’s CronBundle or Symfony\Component\Console to fetch data periodically:

  // src/Command/FetchLottoDataCommand.php
  class FetchLottoDataCommand extends Command
  {
      protected function execute(InputInterface $input, OutputInterface $output): int
      {
          $this->get('lotto_service')->fetchAndCacheResults();
          return Command::SUCCESS;
      }
  }
  

Gotchas and Tips

Pitfalls

1. Rate Limiting: The Polish lottery server may throttle requests. Implement exponential backoff:

   try {
       $results = $lottoService->getLottoResults();
   } catch (RateLimitException $e) {
       sleep(2 ** $attempt); // Exponential backoff
   }
   

2. Data Format Changes: The API response structure may change. Validate responses:

   $results = $lottoService->getLottoResults();
   if (!isset($results['draws'])) {
       throw new \RuntimeException('Unexpected API response format');
   }
   

3. Deprecated Methods: Avoid hardcoding endpoints. Use the service’s configured client:

   // Bad: Hardcoded URL
   $client = new \GuzzleHttp\Client(['base_uri' => 'https://old-api-url']);
   
   // Good: Use service's client
   $client = $this->get('lotto_service')->getClient();
   

Debugging

• Enable Debug Mode: Set APP_DEBUG=1 in .env to log API responses:

  // In LottoService
  $this->logger->debug('Raw API response:', ['data' => $rawResponse]);
  

• Mock the Service: Use PHPUnit to mock LottoService in tests:

  $mockService = $this->createMock(LottoService::class);
  $mockService->method('getLottoResults')->willReturn(['draws' => []]);
  $this->container->set('lotto_service', $mockService);
  

Extension Points

1. Custom Endpoints: Extend the service to support additional lottery types (e.g., EuroMillions):

   class ExtendedLottoService extends LottoService
   {
       public function getEuroMillionsResults(): array
       {
           return $this->fetchFromUrl('https://api.euro-millions.pl');
       }
   }
   

2. Configuration Overrides: Override default settings in config/packages/dwr_lotto_client.yaml:

   dwr_lotto_client:
       api_url: 'https://custom-api-url.pl'
       cache_lifetime: 7200 # 2 hours
   

3. Event Listeners: Subscribe to events to modify data before rendering:

   // src/EventListener/LottoResultsListener.php
   class LottoResultsListener implements EventSubscriberInterface
   {
       public static function getSubscribedEvents(): array
       {
           return [
               'lotto.results.fetched' => 'onResultsFetched',
           ];
       }
   
       public function onResultsFetched(LottoResultsFetchedEvent $event): void
       {
           $event->setResults($this->transformResults($event->getResults()));
       }
   }
   

4. Async Processing: Use Symfony Messenger to fetch data asynchronously:

   $message = new FetchLottoDataMessage();
   $this->get('message_bus')->dispatch($message);