Add return codes to ProfilePollQueue->add

src/classes/Models/ProfilePollQueue.php

@@ -9,28 +9,37 @@ use Friendica\Directory\Utils\Network;
  */
 class ProfilePollQueue extends \Friendica\Directory\Model
 {
-	public function add(string $profile_url): bool
+	const EMPTY_URL      = 1;
+	const MISSING_HOST   = 2;
+	const PRIVATE_HOST   = 3;
+	const ALREADY_EXISTS = 4;
+
+	/**
+	 * @param string $profile_url
+	 * @return int 0 on success or error code
+	 */
+	public function add(string $profile_url): int
 	{
 		$url = trim($profile_url);
 
 		if (!$url) {
-			return false;
+			return self::EMPTY_URL;
 		}
 
 		$host = parse_url($url, PHP_URL_HOST);
 		if (!$host) {
-			return false;
+			return self::MISSING_HOST;
 		}
 
 		if (Network::isPublicHost($host)) {
-			return false;
+			return self::PRIVATE_HOST;
 		}
 
-		$this->atlas->perform(
+		$affected = $this->atlas->fetchAffected(
 			'INSERT IGNORE INTO `profile_poll_queue` SET `profile_url` = :profile_url',
 			['profile_url' => $url]
 		);
 
-		return true;
+		return ($affected == 1 ? 0 : self::ALREADY_EXISTS);
 	}
 }