Introducing the "failed" counter

database.sql

@@ -1,6 +1,6 @@
 -- ------------------------------------------
 -- Friendica 2022.05-rc (Siberian Iris)
--- DB_UPDATE_VERSION 1461
+-- DB_UPDATE_VERSION 1462
 -- ------------------------------------------
 
 
@@ -1126,6 +1126,7 @@ CREATE TABLE IF NOT EXISTS `post-delivery` (
 	`uid` mediumint unsigned COMMENT 'Delivering user',
 	`created` datetime DEFAULT '0001-01-01 00:00:00' COMMENT '',
 	`command` varbinary(32) COMMENT '',
+	`failed` tinyint DEFAULT 0 COMMENT 'Number of times the delivery has failed',
 	 PRIMARY KEY(`uri-id`,`inbox-id`),
 	 INDEX `inbox-id_created` (`inbox-id`,`created`),
 	 INDEX `uid` (`uid`),

doc/database/db_post-delivery.md

@@ -13,6 +13,7 @@ Fields
 | uid      | Delivering user                                           | mediumint unsigned | YES  |     | NULL                |       |
 | created  |                                                           | datetime           | YES  |     | 0001-01-01 00:00:00 |       |
 | command  |                                                           | varbinary(32)      | YES  |     | NULL                |       |
+| failed   | Number of times the delivery has failed                   | tinyint            | YES  |     | 0                   |       |
 
 Indexes
 ------------

src/Model/Post/Delivery.php

@@ -57,8 +57,19 @@ class Delivery
 		DBA::delete('post-delivery', ['uri-id' => $uri_id, 'inbox-id' => ItemURI::getIdByURI($inbox)]);
 	}
 
+	/**
+	 * Increment "failed" counter for the given inbox and post
+	 *
+	 * @param integer $uri_id
+	 * @param string  $inbox
+	 */
+	public static function incrementFailed(int $uri_id, string $inbox)
+	{
+		return DBA::e('UPDATE `post-delivery` SET `failed` = `failed` + 1 WHERE `uri-id` = ? AND `inbox-id` = ?', $uri_id, ItemURI::getIdByURI($inbox));
+	}
+
 	public static function selectForInbox(string $inbox)
 	{
-		return DBA::selectToArray('post-delivery', [], ['inbox-id' => ItemURI::getIdByURI($inbox)], ['order' => ['created']]);
+		return DBA::selectToArray('post-delivery', [], ["`inbox-id` = ? AND `failed` < ?", ItemURI::getIdByURI($inbox), 15], ['order' => ['created']]);
 	}
 }

src/Worker/APDelivery.php

@@ -131,8 +131,12 @@ class APDelivery
 			$data = ActivityPub\Transmitter::createCachedActivityFromItem($item_id);
 			if (!empty($data)) {
 				$success = HTTPSignature::transmit($data, $inbox, $uid);
-				if ($success && $uri_id) {
+				if ($uri_id) {
-					Post\Delivery::remove($uri_id, $inbox);
+					if ($success) {
+						Post\Delivery::remove($uri_id, $inbox);
+					} else {
+						Post\Delivery::incrementFailed($uri_id, $inbox);
+					}
 				}
 			}
 		}

static/dbstructure.config.php

@@ -55,7 +55,7 @@
 use Friendica\Database\DBA;
 
 if (!defined('DB_UPDATE_VERSION')) {
-	define('DB_UPDATE_VERSION', 1461);
+	define('DB_UPDATE_VERSION', 1462);
 }
 
 return [
@@ -1165,6 +1165,7 @@ return [
 			"uid" => ["type" => "mediumint unsigned", "foreign" => ["user" => "uid"], "comment" => "Delivering user"],
 			"created" => ["type" => "datetime", "default" => DBA::NULL_DATETIME, "comment" => ""],
 			"command" => ["type" => "varbinary(32)", "comment" => ""],
+			"failed" => ["type" => "tinyint", "default" => 0, "comment" => "Number of times the delivery has failed"],
 		],
 		"indexes" => [
 			"PRIMARY" => ["uri-id", "inbox-id"],