Add ability to expose TCP connections (#123)

app/Server/Http/Controllers/Admin/GetTcpConnectionsController.php

@@ -0,0 +1,41 @@
+<?php
+
+namespace App\Server\Http\Controllers\Admin;
+
+use App\Contracts\ConnectionManager;
+use App\Server\Configuration;
+use App\Server\Connections\TcpControlConnection;
+use Illuminate\Http\Request;
+use Ratchet\ConnectionInterface;
+
+class GetTcpConnectionsController extends AdminController
+{
+    /** @var ConnectionManager */
+    protected $connectionManager;
+    /** @var Configuration */
+    protected $configuration;
+
+    public function __construct(ConnectionManager $connectionManager, Configuration $configuration)
+    {
+        $this->connectionManager = $connectionManager;
+    }
+
+    public function handle(Request $request, ConnectionInterface $httpConnection)
+    {
+        $httpConnection->send(
+            respond_json([
+                'tcp_connections' => collect($this->connectionManager->getConnections())
+                    ->filter(function ($connection) {
+                        return get_class($connection) === TcpControlConnection::class;
+                    })
+                    ->map(function ($site, $siteId) {
+                        $site = $site->toArray();
+                        $site['id'] = $siteId;
+
+                        return $site;
+                    })
+                    ->values(),
+            ])
+        );
+    }
+}