SSR module: live progress bar for cache warming

The Cache warming row of the VITEC SSR module now shows a Bootstrap progress bar with a running counter instead of asking for a reload. New ajax route vitec_ssr_health (SsrController::healthJson) returns the node /__health JSON; ssr-warm-progress.js polls it every 2 s while a warm run is active and every 15 s otherwise (pauses in background tabs) and also refreshes the Cache: N pages / M MB line. The health fetch moved into SsrController::fetchHealth, shared by indexAction and the ajax route; its error text is English now. Verified live in the backend: bar, counter and cache line advance during a run.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

packages/vitec/Classes/Controller/Backend/SsrController.php

@@ -19,6 +19,7 @@ use TYPO3\CMS\Core\Http\RequestFactory;
 use TYPO3\CMS\Core\Messaging\FlashMessage;
 use TYPO3\CMS\Core\Site\SiteFinder;
 use TYPO3\CMS\Core\Messaging\FlashMessageService;
+use TYPO3\CMS\Core\Page\PageRenderer;
 use TYPO3\CMS\Core\Type\ContextualFeedbackSeverity;
 use TYPO3\CMS\Core\Utility\GeneralUtility;
 
@@ -36,6 +37,7 @@ final class SsrController
         private readonly ConnectionPool $connectionPool,
         private readonly FlashMessageService $flashMessageService,
         private readonly UriBuilder $uriBuilder,
+        private readonly PageRenderer $pageRenderer,
     ) {}
 
     public function indexAction(ServerRequestInterface $request): ResponseInterface
@@ -43,29 +45,8 @@ final class SsrController
         $view = $this->moduleTemplateFactory->create($request);
         $view->setTitle('VITEC SSR');
 
-        $health = null;
-        $healthError = '';
-        $endpoint = $this->purgeService->getHealthEndpoint();
-        if ($endpoint === '') {
-            $healthError = 'var/vitec-ssr-purge.env fehlt oder ist unvollständig.';
-        } else {
-            $start = microtime(true);
-            try {
-                $response = $this->requestFactory->request($endpoint, 'GET', [
-                    'timeout' => 3, 'connect_timeout' => 2, 'http_errors' => false,
-                ]);
-                if ($response->getStatusCode() === 200) {
-                    $health = json_decode((string)$response->getBody(), true) ?: null;
-                    if ($health !== null) {
-                        $health['responseMs'] = (int)round((microtime(true) - $start) * 1000);
-                    }
-                } else {
-                    $healthError = 'HTTP ' . $response->getStatusCode();
-                }
-            } catch (\Throwable $e) {
-                $healthError = $e->getMessage();
-            }
-        }
+        [$health, $healthError] = $this->fetchHealth();
+        $this->pageRenderer->loadJavaScriptModule('@evomedien/vitec/ssr-warm-progress.js');
 
         $view->assignMultiple([
             'flagOn' => file_exists(Environment::getVarPath() . '/vitec-ssr-on.flag'),
@@ -186,6 +167,44 @@ final class SsrController
         ]);
     }
 
+    /**
+     * GET /__health of the SSR node. Returns [health array|null, error string].
+     */
+    private function fetchHealth(): array
+    {
+        $endpoint = $this->purgeService->getHealthEndpoint();
+        if ($endpoint === '') {
+            return [null, 'var/vitec-ssr-purge.env missing or incomplete.'];
+        }
+        $start = microtime(true);
+        try {
+            $response = $this->requestFactory->request($endpoint, 'GET', [
+                'timeout' => 3, 'connect_timeout' => 2, 'http_errors' => false,
+            ]);
+            if ($response->getStatusCode() !== 200) {
+                return [null, 'HTTP ' . $response->getStatusCode()];
+            }
+            $health = json_decode((string)$response->getBody(), true) ?: null;
+            if ($health === null) {
+                return [null, 'invalid JSON from /__health'];
+            }
+            $health['responseMs'] = (int)round((microtime(true) - $start) * 1000);
+            return [$health, ''];
+        } catch (\Throwable $e) {
+            return [null, $e->getMessage()];
+        }
+    }
+
+    /**
+     * Ajax route vitec_ssr_health: live status for the module's
+     * "Cache warming" progress bar (ssr-warm-progress.js polls it).
+     */
+    public function healthJson(ServerRequestInterface $request): ResponseInterface
+    {
+        [$health, $error] = $this->fetchHealth();
+        return new JsonResponse(['health' => $health, 'error' => $error]);
+    }
+
     private function rows(string $table, int $limit): array
     {
         try {