Add KCP support

src/Transport/KcpFrameServerConnection.php

@@ -0,0 +1,75 @@
+<?php
+
+declare(strict_types=1);
+
+namespace LayLink\Transport;
+
+use LayLink\Protocol\Frame;
+use Workerman\Connection\UdpConnection;
+
+final class KcpFrameServerConnection implements FrameServerConnection
+{
+    private bool $closed = false;
+
+    public function __construct(
+        private readonly int $id,
+        private UdpConnection $connection,
+        private readonly KcpReliableSession|NativeKcpSession $session,
+        private readonly int $maxSendBuffer,
+    ) {
+    }
+
+    public function id(): int
+    {
+        return $this->id;
+    }
+
+    public function send(Frame $frame): bool|null
+    {
+        if ($this->closed) {
+            return false;
+        }
+
+        return $this->session->sendFrame($frame, $this->maxSendBuffer);
+    }
+
+    public function close(): void
+    {
+        if ($this->closed) {
+            return;
+        }
+
+        $this->closed = true;
+        $this->session->close();
+    }
+
+    public function pauseRecv(): void
+    {
+        $this->session->pause();
+    }
+
+    public function resumeRecv(): void
+    {
+        $this->session->resume();
+    }
+
+    public function getSendBufferQueueSize(): int
+    {
+        return $this->session->getSendBufferQueueSize();
+    }
+
+    public function getRemoteIp(): string
+    {
+        return $this->connection->getRemoteIp();
+    }
+
+    public function updateConnection(UdpConnection $connection): void
+    {
+        $this->connection = $connection;
+    }
+
+    public function isClosed(): bool
+    {
+        return $this->closed || $this->session->isClosed();
+    }
+}