From 3ebd4e4429a9680046daeac2ed8753471365be9e Mon Sep 17 00:00:00 2001 From: Shpuld Shpuldson Date: Wed, 1 Jul 2020 17:55:42 +0300 Subject: [PATCH] document the 'mark-as-read-detection' system --- .../notifications_fetcher.service.js | 17 +++++++++-------- 1 file changed, 9 insertions(+), 8 deletions(-) diff --git a/src/services/notifications_fetcher/notifications_fetcher.service.js b/src/services/notifications_fetcher/notifications_fetcher.service.js index 581931f5..c2552480 100644 --- a/src/services/notifications_fetcher/notifications_fetcher.service.js +++ b/src/services/notifications_fetcher/notifications_fetcher.service.js @@ -27,17 +27,18 @@ const fetchAndUpdate = ({ store, credentials, older = false }) => { } const result = fetchNotifications({ store, args, older }) - // load unread notifications repeatedly to provide consistency between browser tabs + // If there's any unread notifications, try fetch notifications since + // the newest read notification to check if any of the unread notifs + // have changed their 'seen' state (marked as read in another session), so + // we can update the state in this session to mark them as read as well. + // The normal maxId-check does not tell if older notifications have changed const notifications = timelineData.data const readNotifsIds = notifications.filter(n => n.seen).map(n => n.id) - if (readNotifsIds.length) { - const possibleMax = Math.max(...readNotifsIds) - if (possibleMax !== timelineData.maxId) { - args['since'] = possibleMax - fetchNotifications({ store, args, older }) - } + const numUnseenNotifs = notifications.length - readNotifsIds.length + if (numUnseenNotifs > 0) { + args['since'] = Math.max(...readNotifsIds) + fetchNotifications({ store, args, older }) } - return result } }