refactor: move buspro XML protocol into XmlChannel

src/Service/XmlDumpReader.php

@@ -37,7 +37,7 @@ class XmlDumpReader
             return [];
         }
 
-        $pattern = '/^'.preg_quote($requestId, '/').'(_\d+)?_(request|response)\.xml$/';
+        $pattern = '/^'.preg_quote($requestId, '/').'(_\d+)?_('.XmlDumpWriter::REQUEST.'|'.XmlDumpWriter::RESPONSE.')\.xml$/';
         $matches = [];
 
         foreach ($this->xmlDump->listContents('.') as $item) {

src/Service/XmlDumpWriter.php

@@ -0,0 +1,35 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Service;
+
+use League\Flysystem\FilesystemException;
+use League\Flysystem\FilesystemOperator;
+
+/**
+ * Writes the XML dumps of BusProNet API communication that XmlDumpReader finds and reads.
+ */
+class XmlDumpWriter
+{
+    public const REQUEST = 'request';
+    public const RESPONSE = 'response';
+
+    public function __construct(
+        private readonly FilesystemOperator $xmlDump,
+    ) {
+    }
+
+    /**
+     * A dump is a diagnostic aid, so failing to write one never fails the request it records.
+     *
+     * @param self::REQUEST|self::RESPONSE $direction
+     */
+    public function write(string $requestId, string $direction, string $body): void
+    {
+        try {
+            $this->xmlDump->write($requestId.'_'.$direction.'.xml', $body);
+        } catch (FilesystemException) {
+        }
+    }
+}