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Check for non-empty pages when falling back (#3603)

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Requesting a non-existent notification ID will cause the fall-back requests to succeed but return empty lists which stops pagination.

Check for this, and in the worst case, fall back to returning the most recent notifications.
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Nik Clayton 2023-05-04 13:19:28 +02:00 committed by GitHub
parent 62b91664e9
commit 4da758c1f7
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GPG key ID: 4AEE18F83AFDEB23
1 changed files with 18 additions and 7 deletions
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25
app/src/main/java/com/keylesspalace/tusky/components/notifications/NotificationsPagingSource.kt
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@ -97,9 +97,10 @@ class NotificationsPagingSource @Inject constructor(
* - If there is no key, a page of the most recent notifications is returned
* - If the notification exists, and is not filtered, a page of notifications is returned
* - If the notification does not exist, or is filtered, the page of notifications immediately
* before is returned
* before is returned (if non-empty)
* - If there is no page of notifications immediately before then the page immediately after
* is returned
* is returned (if non-empty)
* - Finally, fall back to the most recent notifications
*/
private suspend fun getInitialPage(params: LoadParams<String>): Response<List<Notification>> = coroutineScope {
// If the key is null this is straightforward, just return the most recent notifications.
@ -163,15 +164,25 @@ class NotificationsPagingSource @Inject constructor(
}
// The user's last read notification was missing or is filtered. Use the page of
// notifications chronologically older than their desired notification.
deferredNotificationPage.await().apply {
if (this.isSuccessful) return@coroutineScope this
// notifications chronologically older than their desired notification. This page must
// *not* be empty (as noted earlier, if it is, paging stops).
deferredNotificationPage.await().let { response ->
if (response.isSuccessful) {
if (!response.body().isNullOrEmpty()) return@coroutineScope response
}
}
// There were no notifications older than the user's desired notification. Return the page
// of notifications immediately newer than their desired notification.
// of notifications immediately newer than their desired notification. This page must
// *not* be empty (as noted earlier, if it is, paging stops).
mastodonApi.notifications(minId = key, limit = params.loadSize, excludes = notificationFilter).let { response ->
if (response.isSuccessful) {
if (!response.body().isNullOrEmpty()) return@coroutineScope response
}
}
// Everything failed -- fallback to fetching the most recent notifications
return@coroutineScope mastodonApi.notifications(
minId = key,
limit = params.loadSize,
excludes = notificationFilter
)