+ * Check if the cached suggestion is outdated
+ *
+ * @param integer $uid
+ * @return boolean
+ */
+ static public function areSuggestionsOutdated(int $uid): bool
+ {
+ return DI::pConfig()->get($uid, 'suggestion', 'last_update') + 3600 < time();
+ }
+
+ /**
+ * Update contact suggestions for a given user
+ *
+ * @param integer $uid
+ * @return void
+ */
+ static public function updateCachedSuggestions(int $uid)
+ {
+ if (!self::areSuggestionsOutdated($uid)) {
+ return;
+ }
+
+ DBA::delete('account-suggestion', ['uid' => $uid, 'ignore' => false]);
+
+ foreach (self::getSuggestions($uid) as $contact) {
+ DBA::insert('account-suggestion', ['uri-id' => $contact['uri-id'], 'uid' => $uid, 'level' => 1], Database::INSERT_IGNORE);
+ }
+
+ DI::pConfig()->set($uid, 'suggestion', 'last_update', time());
+ }
+
+ /**
+ * Returns a cached array of suggested contacts for given user id
+ *
+ * @param int $uid User id
+ * @param int $start optional, default 0
+ * @param int $limit optional, default 80
+ * @return array
+ */
+ static public function getCachedSuggestions(int $uid, int $start = 0, int $limit = 80): array
+ {
+ $condition = ["`uid` = ? AND `uri-id` IN (SELECT `uri-id` FROM `account-suggestion` WHERE NOT `ignore` AND `uid` = ?)", 0, $uid];
+ $params = ['limit' => [$start, $limit]];
+ $cached = DBA::selectToArray('contact', [], $condition, $params);
+
+ if (!empty($cached)) {
+ return $cached;
+ } else {
+ return self::getSuggestions($uid, $start, $limit);
+ }
+ }
+
+ /**
+ * Returns an array of suggested contacts for given user id
+ *
+ * @param int $uid User id