refactor: move buspro XML protocol into XmlChannel

src/BusProNet/Transport/RequestIdSequence.php

@@ -0,0 +1,31 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\BusProNet\Transport;
+
+use App\Service\RequestIdGenerator;
+use Symfony\Component\HttpFoundation\RequestStack;
+
+/**
+ * Ids for BPN requests: the id of the current HTTP request, or a fresh one on the CLI, with a
+ * running number, so the log entries and dumps of one page load can be found together.
+ */
+class RequestIdSequence
+{
+    private int $counter = 0;
+
+    public function __construct(
+        private readonly RequestStack $requestStack,
+        private readonly RequestIdGenerator $requestIdGenerator,
+    ) {
+    }
+
+    public function next(): string
+    {
+        $baseId = $this->requestStack->getMainRequest()?->attributes->get('request_id')
+            ?? $this->requestIdGenerator->generateBaseId();
+
+        return $baseId.'_'.++$this->counter;
+    }
+}