Update DeduplicationChanges.md

notes/DeduplicationChanges.md

@@ -1,3 +1,47 @@
+# ActivityPub Delivery boilerplate
+- `ActivityPubDeliveryService::pool($profile, $audience, $activity);`
+
+replaces
+```
+        $payload = json_encode($activity);
+
+        $client = new Client([
+            'timeout' => config('federation.activitypub.delivery.timeout'),
+        ]);
+
+        $version = config('pixelfed.version');
+        $appUrl = config('app.url');
+        $userAgent = "(Pixelfed/{$version}; +{$appUrl})";
+
+        $requests = function ($audience) use ($client, $activity, $profile, $payload, $userAgent) {
+            foreach ($audience as $url) {
+                $headers = HttpSignature::sign($profile, $url, $activity, [
+                    'Content-Type' => 'application/ld+json; profile="https://www.w3.org/ns/activitystreams"',
+                    'User-Agent' => $userAgent,
+                ]);
+                yield function () use ($client, $url, $headers, $payload) {
+                    return $client->postAsync($url, [
+                        'curl' => [
+                            CURLOPT_HTTPHEADER => $headers,
+                            CURLOPT_POSTFIELDS => $payload,
+                            CURLOPT_HEADER => true,
+                        ],
+                    ]);
+                };
+            }
+        };
+
+        $pool = new Pool($client, $requests($audience), [
+            'concurrency' => config('federation.activitypub.delivery.concurrency'),
+            'fulfilled' => function ($response, $index) {},
+            'rejected' => function ($reason, $index) {},
+        ]);
+
+        $promise = $pool->promise();
+
+        $promise->wait();
+```
+
 # Username validation boilerplate
 - `new ValidUsername,`
 replaces