Fallback to database lock if locking fails

[friendica.git] / src / Model / APContact.php

diff --git a/src/Model/APContact.php b/src/Model/APContact.php
index d31aa5d3727f4eecebdbb6d7e9f0841b37d310b8..6a8e5b3ae1c78e39433c1d25543fab4a02718616 100644 (file)
--- a/src/Model/APContact.php
+++ b/src/Model/APContact.php
@@ -22,8 +22,11 @@
 namespace Friendica\Model;
 
 use Friendica\Content\Text\HTML;
+use Friendica\Core\Cache\Duration;
 use Friendica\Core\Logger;
+use Friendica\Core\System;
 use Friendica\Database\DBA;
+use Friendica\DI;
 use Friendica\Network\Probe;
 use Friendica\Protocol\ActivityNamespace;
 use Friendica\Protocol\ActivityPub;
@@ -40,7 +43,7 @@ class APContact
         * @param string $addr Address
         * @return array webfinger data
         */
-       public static function fetchWebfingerData(string $addr)
+       private static function fetchWebfingerData(string $addr)
        {
                $addr_parts = explode('@', $addr);
                if (count($addr_parts) != 2) {
@@ -154,6 +157,16 @@ class APContact
                        return $fetched_contact;
                }
 
+               // Detect multiple fast repeating request to the same address
+               // See https://github.com/friendica/friendica/issues/9303
+               $cachekey = 'apcontact:getByURL:' . $url;
+               $result = DI::cache()->get($cachekey);
+               if (!is_null($result)) {
+                       Logger::notice('Multiple requests for the address', ['url' => $url, 'update' => $update, 'callstack' => System::callstack(20), 'result' => $result]);
+               } else {
+                       DI::cache()->set($cachekey, System::callstack(20), Duration::FIVE_MINUTES);
+               }
+
                $apcontact['url'] = $compacted['@id'];
                $apcontact['uuid'] = JsonLD::fetchElement($compacted, 'diaspora:guid', '@value');
                $apcontact['type'] = str_replace('as:', '', JsonLD::fetchElement($compacted, '@type'));