Implemented subscription logic

src/Broker/Message.php

@@ -44,6 +44,16 @@ class Message
         return time() - $this->created;
     }
 
+    public function toString(): string
+    {
+        $msg = [];
+        if ($this->type) $msg[] = "event: ".$this->type;
+        if ($this->retry) $msg[] = "retry: ".$this->retry;
+        if ($this->id) $msg[] = "id: ".$this->id;
+        if ($this->data) $msg[] = "data: ".$this->data;
+        return join("\n", $msg)."\n\n";
+    }
+
     public static function fromData(array $data): Message
     {
         return new Message(

src/Broker/SseSubscriber.php

@@ -0,0 +1,24 @@
+<?php
+
+namespace NoccyLabs\Mercureact\Broker;
+
+use React\Stream\WritableStreamInterface;
+
+class SseSubscriber implements SubscriberInterface
+{
+    public function __construct(
+        private WritableStreamInterface $stream
+    )
+    {
+    }
+
+    public function deliver(Message $message): void
+    {
+        $this->stream->write($message->toString());
+    }
+
+    public function isAuthorized(string $topics): bool
+    {
+        return true;
+    }
+}

src/Broker/SubscriberInterface.php

@@ -0,0 +1,10 @@
+<?php
+
+namespace NoccyLabs\Mercureact\Broker;
+
+interface SubscriberInterface
+{
+    public function deliver(Message $message): void;
+
+    public function isAuthorized(string $topics): bool;
+}

src/Broker/SubscriptionList.php

@@ -1,28 +0,0 @@
-<?php
-
-namespace NoccyLabs\Mercureact\Broker;
-
-use ArrayIterator;
-use Countable;
-use IteratorAggregate;
-use SplObjectStorage;
-use Traversable;
-
-class SubscriptionList implements Countable, IteratorAggregate
-{
-
-    private array $subscriptions = [];
-
-    
-
-    public function count(): int
-    {
-        return count($this->subscriptions);
-    }
-
-    public function getIterator(): Traversable
-    {
-        return new ArrayIterator($this->subscriptions);
-    }
-}
-

src/Broker/Topic.php

@@ -10,17 +10,19 @@ class Topic
 
     /** @var string Topic name */
     private string $topic;
+
     /** @var array<string,Message> */
     private array $messages = [];
+    
     /** @var int Creation unixtime */
     private int $created;
 
-    private SubscriptionList $subscribers;
+    private SplObjectStorage $subscribers;
 
     public function __construct(string $topic)
     {
         $this->topic = $topic;
-        $this->subscribers = new SubscriptionList();
+        $this->subscribers = new SplObjectStorage();
         $this->created = time();
     }
 
@@ -31,8 +33,10 @@ class Topic
         foreach ($this->subscribers as $subscriber) {
             if ($message->private === true) {
                 // TODO check subscriber access
+                $subscriber->deliver($message);
             } else {
                 // TODO deliver to subscriber
+                $subscriber->deliver($message);
             }
         }
     }
@@ -52,6 +56,16 @@ class Topic
         return count($this->subscribers);
     }
 
+    public function addSubscriber(SubscriberInterface $subscriber)
+    {
+        $this->subscribers->attach($subscriber);
+    }
+
+    public function removeSubscriber(SubscriberInterface $subscriber)
+    {
+        $this->subscribers->detach($subscriber);
+    }
+
     /**
      * Garbage collect histry
      * 

src/Broker/TopicManager.php

@@ -9,6 +9,12 @@ class TopicManager
     /** @var array<string,Topic> */
     private array $topics = [];
 
+    private SplObjectStorage $subscribers;
+
+    public function __construct()
+    {
+        $this->subscribers = new SplObjectStorage();
+    }
 
     public function getTopic(string $topic): Topic
     {
@@ -25,6 +31,26 @@ class TopicManager
         }
     }
 
+    public function subscribe(SubscriberInterface $subscriber, array $topics): void
+    {
+        foreach ($topics as $topic) {
+            $this->getTopic($topic)->addSubscriber($subscriber);
+        }
+    }
+
+    public function unsubscribe(SubscriberInterface $subscriber, ?array $topics=null): void
+    {
+        if (!$topics) {
+            foreach ($this->topics as $topic) {
+                $topic->removeSubscriber($subscriber);
+            }
+            return;
+        }
+        foreach ($topics as $topic) {
+            $this->getTopic($topic)->removeSubscriber($subscriber);
+        }
+    }
+
     public function getTopicCount(): int
     {
         return count($this->topics);
@@ -32,7 +58,7 @@ class TopicManager
 
     public function getSubscriberCount(): int
     {
-        return array_sum(array_map(fn($t) => $t->getSubscriberCount(), $this->topics));
+        return count($this->subscribers);
     }
 
     public function garbageCollect(): void