Initial Commit

dependencies/amphp/dns/lib/BlockingFallbackResolver.php

@@ -0,0 +1,35 @@
+<?php
+
+namespace WP_Ultimo\Dependencies\Amp\Dns;
+
+use WP_Ultimo\Dependencies\Amp\Failure;
+use WP_Ultimo\Dependencies\Amp\Promise;
+use WP_Ultimo\Dependencies\Amp\Success;
+class BlockingFallbackResolver implements Resolver
+{
+    public function resolve(string $name, int $typeRestriction = null) : Promise
+    {
+        if (!\in_array($typeRestriction, [Record::A, null], \true)) {
+            return new Failure(new DnsException("Query for '{$name}' failed, because loading the system's DNS configuration failed and querying records other than A records isn't supported in blocking fallback mode."));
+        }
+        return $this->query($name, Record::A);
+    }
+    public function query(string $name, int $type) : Promise
+    {
+        if ($type !== Record::A) {
+            return new Failure(new DnsException("Query for '{$name}' failed, because loading the system's DNS configuration failed and querying records other than A records isn't supported in blocking fallback mode."));
+        }
+        $result = \gethostbynamel($name);
+        if ($result === \false) {
+            return new Failure(new DnsException("Query for '{$name}' failed, because loading the system's DNS configuration failed and blocking fallback via gethostbynamel() failed, too."));
+        }
+        if ($result === []) {
+            return new Failure(new NoRecordException("No records returned for '{$name}' using blocking fallback mode."));
+        }
+        $records = [];
+        foreach ($result as $record) {
+            $records[] = new Record($record, Record::A, null);
+        }
+        return new Success($records);
+    }
+}