store export parameters in redis key (issue #33)

Controller/ExportController.php

@@ -33,6 +33,8 @@ use Chill\MainBundle\Export\ExportManager;
 use Psr\Log\LoggerInterface;
 use Symfony\Component\HttpFoundation\Session\SessionInterface;
 use Symfony\Component\Form\FormFactoryInterface;
+use Chill\MainBundle\Redis\ChillRedis;
+use Symfony\Component\Translation\TranslatorInterface;
 
 /**
  * ExportController is the controller use for exporting data.
@@ -66,16 +68,32 @@ class ExportController extends Controller
      */
     protected $formFactory;
     
+    /**
+     *
+     * @var ChillRedis
+     */
+    protected $redis;
+    
+    /**
+     *
+     * @var TranslatorInterface
+     */
+    protected $translator;
+    
     public function __construct(
+        ChillRedis $chillRedis,
         ExportManager $exportManager,
         FormFactoryInterface $formFactory,
         LoggerInterface $logger,
-        SessionInterface $session
+        SessionInterface $session,
+        TranslatorInterface $translator
     ) {
+        $this->redis = $chillRedis;
         $this->exportManager = $exportManager;
         $this->formFactory = $formFactory;
         $this->logger = $logger;
         $this->session = $session;
+        $this->translator = $translator;
     }
 
     
@@ -393,9 +411,8 @@ class ExportController extends Controller
     }
 
     /**
-     * Gather data stored in session from previous steps, and redirect
+     * Gather data stored in session from previous steps, store it inside redis
-     * to the `generate` action, compiling data from previous step in the URL
+     * and redirect to the `generate` action.
-     * (to obtain a GET HTTP query).
      *
      * The data from previous steps is removed from session.
      *
@@ -416,22 +433,24 @@ class ExportController extends Controller
             ));
         }
         
+        $parameters = [
+              'formatter' => $dataFormatter ?? [],
+              'export' => $dataExport ?? [],
+              'centers' => $dataCenters ?? [],
+              'alias' => $alias
+              ];
+        unset($parameters['_token']);
+        $key = md5(uniqid(rand(), false));
+        
+        $this->redis->setEx($key, 3600, \serialize($parameters));
+
         // remove data from session
         $this->session->remove('export_step_raw');
         $this->session->remove('export_step');
         $this->session->remove('formatter_step_raw');
         $this->session->remove('formatter_step');
 
-        $redirectParameters = array_merge(
+        return $this->redirectToRoute('chill_main_export_download', [ 'key' => $key, 'alias' => $alias ]);
-              $dataFormatter ?? [],
-              $dataExport ?? [],
-              $dataCenters ?? [],
-              array('alias' => $alias)
-              );
-        unset($redirectParameters['_token']);
-
-        return $this->redirectToRoute('chill_main_export_download',
-              $redirectParameters);
     }
 
     /**
@@ -447,44 +466,65 @@ class ExportController extends Controller
     {
         /* @var $exportManager \Chill\MainBundle\Export\ExportManager */
         $exportManager = $this->exportManager;
-        $export = $exportManager->getExport($alias);
+        $key = $request->query->get('key', null);
         
-        $formCenters = $this->createCreateFormExport($alias, 'generate_centers');
+        list($dataCenters, $dataExport, $dataFormatter) = $this->rebuildData($key);
-        $formCenters->handleRequest($request);
-        $dataCenters = $formCenters->getData();
-
-        $formExport = $this->createCreateFormExport($alias, 'generate_export', $dataCenters);
-        $formExport->handleRequest($request);
-        $dataExport = $formExport->getData();
-
-        if ($export instanceof \Chill\MainBundle\Export\ExportInterface) {
-            $formFormatter = $this->createCreateFormExport($alias, 'generate_formatter',
-                  $dataExport);
-            $formFormatter->handleRequest($request);
-            $dataFormatter = $formFormatter->getData();
-        }
 
         $r = $exportManager->generate(
             $alias, 
             $dataCenters['centers'],
             $dataExport['export'], 
-            isset($dataFormatter) ? $dataFormatter['formatter'] : []
+            $dataFormatter !== NULL ? $dataFormatter['formatter'] : []
             );
 
         return $r;
     }
     
+    protected function rebuildData($key)
+    {
+        if ($key === NULL) {
+            throw $this->createHttpNotFoundException("key does not exists");
+        }
+        
+        if ($this->redis->exists($key) !== 1) {
+            $this->addFlash('error', $this->translator->trans("This report is not available any more"));
+            throw $this->createHttpNotFoundException("key does not exists");
+        }
+        
+        $serialized = $this->redis->get($key);
+        
+        if ($serialized === false) {
+            throw new \LogicException("the key could not be reached from redis");
+        }
+        
+        $rawData = \unserialize($serialized);
+        $alias = $rawData['alias'];
+        
+        $formCenters = $this->createCreateFormExport($alias, 'generate_centers');
+        $formCenters->submit($rawData['centers']);
+        $dataCenters = $formCenters->getData();
+
+        $formExport = $this->createCreateFormExport($alias, 'generate_export', $dataCenters);
+        $formExport->submit($rawData['export']);
+        $dataExport = $formExport->getData();
+
+        if (count($rawData['formatter']) > 0) {
+            $formFormatter = $this->createCreateFormExport($alias, 'generate_formatter',
+                  $dataExport);
+            $formFormatter->submit($rawData['formatter']);
+            $dataFormatter = $formFormatter->getData();
+        }
+        
+        return [$dataCenters, $dataExport, $dataFormatter ?? null];
+    }
+
     public function downloadResultAction(Request $request, $alias)
     {  
         /* @var $exportManager \Chill\MainBundle\Export\ExportManager */
         $exportManager = $this->exportManager;
-        $formCenters = $this->createCreateFormExport($alias, 'generate_centers');
+        $key = $request->query->get('key', null);
-        $formCenters->handleRequest($request);
-        $dataCenters = $formCenters->getData();
         
-        $formExport = $this->createCreateFormExport($alias, 'generate_export', $dataCenters);
+        list($dataCenters, $dataExport, $dataFormatter) = $this->rebuildData($key);
-        $formExport->handleRequest($request);
-        $dataExport = $formExport->getData();
         
         $formatterAlias = $exportManager->getFormatterAlias($dataExport['export']);
         if ($formatterAlias !== null) {