Initial commit

src/Broker/Message.php

@@ -0,0 +1,59 @@
+<?php
+
+namespace NoccyLabs\Mercureact\Broker;
+
+use SplObjectStorage;
+
+class Message
+{
+    /** @var array<int,string> The topic, if more than one the first is canonical, but all receive delivery */
+    public readonly array $topic;
+    /** @var string|null The SSE event type */
+    public readonly ?string $type;
+    /** @var string|null Message data */
+    public readonly ?string $data;
+    /** @var bool|null Private update*/
+    public readonly ?bool $private;
+    /** @var string|null Message ID */
+    public readonly ?string $id;
+    /** @var int SSE retry interval */
+    public readonly ?int $retry;
+
+    private readonly int $created;
+
+    public function __construct(
+        array $topic,
+        ?string $type,
+        ?string $data,
+        ?bool $private,
+        ?string $id,
+        ?int $retry
+    )
+    {
+        $this->topic = $topic;
+        $this->type = $type;
+        $this->data = $data;
+        $this->private = $private;
+        $this->id = $id;
+        $this->retry = $retry;
+        $this->created = time();
+    }
+
+    public function getAge(): int
+    {
+        return time() - $this->created;
+    }
+
+    public static function fromData(array $data): Message
+    {
+        return new Message(
+            topic: (array)$data['topic'],
+            type: $data['type']??null,
+            data: $data['data']??null,
+            private: match ($data['private']??null) { "on" => true, null => null, default => false },
+            id: $data['id']??null,
+            retry: $data['retry']??null,
+        );
+    }
+}
+

src/Broker/SubscriptionList.php

@@ -0,0 +1,20 @@
+<?php
+
+namespace NoccyLabs\Mercureact\Broker;
+
+use Countable;
+use SplObjectStorage;
+
+class SubscriptionList implements Countable
+{
+
+    private array $subscriptions = [];
+
+    
+
+    public function count(): int
+    {
+        return count($this->subscriptions);
+    }
+}
+

src/Broker/Topic.php

@@ -0,0 +1,67 @@
+<?php
+
+namespace NoccyLabs\Mercureact\Broker;
+
+use SplObjectStorage;
+
+class Topic
+{
+    const MAX_HISTORY_AGE = 180;
+
+    /** @var string Topic name */
+    private string $topic;
+    /** @var array<string,Message> */
+    private array $messages = [];
+    /** @var int Creation unixtime */
+    private int $created;
+
+    private SubscriptionList $subscribers;
+
+    public function __construct(string $topic)
+    {
+        $this->topic = $topic;
+        $this->subscribers = new SubscriptionList();
+        $this->created = time();
+    }
+
+    public function publish(Message $message)
+    {
+        // TODO check if message id has already been published
+
+        foreach ($this->subscribers as $subscriber) {
+            if ($message->private === true) {
+                // TODO check subscriber access
+            } else {
+                // TODO deliver to subscriber
+            }
+        }
+    }
+
+    public function getAge(): int
+    {
+        return time() - $this->created;
+    }
+
+    public function getHistorySize(): int
+    {
+        return count($this->messages);
+    }
+
+    public function getSubscriberCount(): int
+    {
+        return count($this->subscribers);
+    }
+
+    /**
+     * Garbage collect histry
+     * 
+     */
+    public function garbageCollect(): void
+    {
+        $this->messages = array_filter(
+            $this->messages,
+            fn($message) => $message->getAge() < self::MAX_HISTORY_AGE
+        );
+    }
+}
+

src/Broker/TopicManager.php

@@ -0,0 +1,50 @@
+<?php
+
+namespace NoccyLabs\Mercureact\Broker;
+
+use SplObjectStorage;
+
+class TopicManager
+{
+    /** @var array<string,Topic> */
+    private array $topics = [];
+
+
+    public function getTopic(string $topic): Topic
+    {
+        if (!isset($this->topics[$topic])) {
+            $this->topics[$topic] = new Topic($topic);
+        }
+        return $this->topics[$topic];
+    }
+
+    public function publish(Message $message): void
+    {
+        foreach ($message->topic as $topic) {
+            $this->getTopic($topic)->publish($message);
+        }
+    }
+
+    public function getTopicCount(): int
+    {
+        return count($this->topics);
+    }
+
+    public function getSubscriberCount(): int
+    {
+        return array_sum(array_map(fn($t) => $t->getSubscriberCount(), $this->topics));
+    }
+
+    public function garbageCollect(): void
+    {
+        $this->topics = array_filter(
+            $this->topics,
+            function (Topic $topic) {
+                $topic->garbageCollect();
+                return ($topic->getHistorySize() > 0 && $topic->getSubscriberCount() > 0) || ($topic->getAge() < 60);
+            }
+        );
+    }
+
+}
+