Read config, handle lastEventId in topicmanager

src/Broker/TopicManager.php

@@ -9,6 +9,8 @@ class TopicManager
     /** @var array<string,Topic> */
     private array $topics = [];
 
+    private ?string $lastEventId = null;
+
     private SplObjectStorage $subscribers;
 
     public function __construct()
@@ -26,6 +28,7 @@ class TopicManager
 
     public function publish(Message $message): void
     {
+        $this->lastEventId = $message->id;
         foreach ($message->topic as $topic) {
             $this->getTopic($topic)->publish($message);
         }
@@ -66,7 +69,7 @@ class TopicManager
                     'topic' => $topic->getTopic(),
                     'subscriber' => $sub->getId(),
                     'active' => true,
-                    'payload' => null,
+                    'payload' => null, // TODO populate from mercure.payload in JWT
                 ];
             }
         }
@@ -74,6 +77,11 @@ class TopicManager
         return $all;
     }
 
+    public function getLastEventId(): ?string
+    {
+        return ($this->lastEventId !== null)?("urn:uuid:".$this->lastEventId):null;
+    }
+
     public function getTopicCount(): int
     {
         return count($this->topics);