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Fix refreshing timeline 

Before on initial load we tried to get current statuses using some
ID math plus we've been fetching latest statuses. Updating current
doesn't actually work so instead now we are doing what Mastodon itself
is doing: we just fetch latest and update current if they overlap.

There were also a few issues with finding overlap index (using
indexOfLast using ===) so it wasn't actually working.
view-update-on-tl-cache
charlag 5 years ago
parent
357250f6d5
commit
453a000d49
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2 changed files with 114 additions and 166 deletions
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  1. 116
      app/src/main/java/com/keylesspalace/tusky/components/timeline/TimelineViewModel.kt
  2. 164
      app/src/test/java/com/keylesspalace/tusky/components/timeline/TimelineViewModelTest.kt

116
app/src/main/java/com/keylesspalace/tusky/components/timeline/TimelineViewModel.kt
Unescape View File

@ -126,47 +126,6 @@ class TimelineViewModel @Inject constructor(
reloadFilters()
}
private suspend fun updateCurrent() {
val topId = statuses.firstIsInstanceOrNull<StatusViewData.Concrete>()?.id ?: return
// Request statuses including current top to refresh all of them
val topIdMinusOne = topId.inc()
val statuses = try {
loadStatuses(
maxId = topIdMinusOne,
sinceId = null,
sinceIdMinusOne = null,
TimelineRequestMode.NETWORK,
)
} catch (t: Exception) {
initialUpdateFailed = true
if (isExpectedRequestException(t)) {
Log.d(TAG, "Failed updating timeline", t)
triggerViewUpdate()
return
} else {
throw t
}
}
initialUpdateFailed = false
// When cached timeline is too old, we would replace it with nothing
if (statuses.isNotEmpty()) {
val mutableStatuses = statuses.toMutableList()
filterStatuses(mutableStatuses)
this.statuses.removeAll { item ->
val id = when (item) {
is StatusViewData.Concrete -> item.id
is StatusViewData.Placeholder -> item.id
}
id == topId || id.isLessThan(topId)
}
this.statuses.addAll(mutableStatuses.toViewData())
}
triggerViewUpdate()
}
private fun isExpectedRequestException(t: Exception) = t is IOException || t is HttpException
fun refresh(): Job {
@ -176,7 +135,6 @@ class TimelineViewModel @Inject constructor(
triggerViewUpdate()
try {
if (initialUpdateFailed) updateCurrent()
loadAbove()
} catch (e: Exception) {
if (isExpectedRequestException(e)) {
@ -458,34 +416,45 @@ class TimelineViewModel @Inject constructor(
return statuses
}
/** Insert statuses from above taking overlaps into account and adding gap if needed. */
private fun updateStatuses(
newStatuses: MutableList<Either<Placeholder, Status>>,
fullFetch: Boolean
) {
// What we want to do here is:
// 1. Find out if there's an overlap between old and new. If there is one, take overlap
// from the server:
// server: [5, 4, 3, 2]
// cached: [3, 2, 1]
// result: [5, 4, 3, 2, 1], index = 2
//
// 2. If there's none and it was full fetch then insert a gap:
// server: [9, 8, 7, 6]
// cached: [4, 3, 2, 1]
// result: [9, 8, 7, 6, 5, 4, 3, 2, 1]
// ^ placeholder
// (assuming LOAD_AT_ONE = 4)
if (statuses.isEmpty()) {
statuses.addAll(newStatuses.toViewData())
} else {
val lastOfNew = newStatuses.lastOrNull()
val index = if (lastOfNew == null) -1
else statuses.indexOfLast { it.asStatusOrNull()?.id === lastOfNew.asRightOrNull()?.id }
else statuses.indexOfFirst { it.asStatusOrNull()?.id == lastOfNew.asRightOrNull()?.id }
Log.d(TAG, "updateStatuses: clearing up to $index")
if (index >= 0) {
statuses.subList(0, index).clear()
statuses.subList(0, index + 1).clear()
}
val newIndex =
newStatuses.indexOfFirst {
it.isRight() && it.asRight().id == (statuses[0] as? StatusViewData.Concrete)?.id
}
if (newIndex == -1) {
if (index == -1 && fullFetch) {
val placeholderId =
newStatuses.last { status -> status.isRight() }.asRight().id.inc()
newStatuses.add(Either.Left(Placeholder(placeholderId)))
}
statuses.addAll(0, newStatuses.toViewData())
} else {
statuses.addAll(0, newStatuses.subList(0, newIndex).toViewData())
// If we loaded max and didn't find overlap then there might be a gap
if (index == -1 && fullFetch) {
val placeholderId =
newStatuses.last { status -> status.isRight() }.asRight().id.inc()
Log.d(TAG, "updateStatuses: Adding placeholder for ")
newStatuses.add(Either.Left(Placeholder(placeholderId)))
}
statuses.addAll(0, newStatuses.toViewData())
}
// Remove all consecutive placeholders
removeConsecutivePlaceholders()
@ -526,7 +495,6 @@ class TimelineViewModel @Inject constructor(
.await()
val mutableStatusResponse = statuses.toMutableList()
filterStatuses(mutableStatusResponse)
if (statuses.size > 1) {
clearPlaceholdersForResponse(mutableStatusResponse)
this.statuses.clear()
@ -548,7 +516,6 @@ class TimelineViewModel @Inject constructor(
tryCache()
isLoadingInitially = statuses.isEmpty()
triggerViewUpdate()
updateCurrent()
try {
loadAbove()
} catch (e: Exception) {
@ -580,31 +547,14 @@ class TimelineViewModel @Inject constructor(
}
private suspend fun loadAbove() {
var firstOrNull: String? = null
var secondOrNull: String? = null
for (i in statuses.indices) {
val status = statuses[i].asStatusOrNull() ?: continue
firstOrNull = status.id
secondOrNull = statuses.getOrNull(i + 1)?.asStatusOrNull()?.id
break
}
try {
if (firstOrNull != null) {
triggerViewUpdate()
val statuses = loadStatuses(
maxId = null,
sinceId = firstOrNull,
sinceIdMinusOne = secondOrNull,
homeMode = TimelineRequestMode.NETWORK
)
val fullFetch = isFullFetch(statuses)
updateStatuses(statuses.toMutableList(), fullFetch)
} else {
loadBelow(null)
}
val statuses = loadStatuses(
maxId = null,
sinceId = null,
sinceIdMinusOne = null,
TimelineRequestMode.NETWORK
)
updateStatuses(statuses.toMutableList(), isFullFetch(statuses))
} finally {
triggerViewUpdate()
}

164
app/src/test/java/com/keylesspalace/tusky/components/timeline/TimelineViewModelTest.kt
Unescape View File

@ -12,6 +12,7 @@ import com.keylesspalace.tusky.network.FilterModel
import com.keylesspalace.tusky.network.MastodonApi
import com.keylesspalace.tusky.network.TimelineCases
import com.keylesspalace.tusky.util.Either
import com.keylesspalace.tusky.util.inc
import com.keylesspalace.tusky.util.toViewData
import com.keylesspalace.tusky.viewdata.StatusViewData
import com.nhaarman.mockitokotlin2.clearInvocations
@ -85,13 +86,13 @@ class TimelineViewModelTest {
val initialResponse = listOf<Status>()
setCachedResponse(initialResponse)
// loadAbove -> loadBelow
// loadAbove
whenever(
timelineRepository.getStatuses(
maxId = null,
sinceId = null,
sincedIdMinusOne = null,
requestMode = TimelineRequestMode.ANY,
requestMode = TimelineRequestMode.NETWORK,
limit = LOAD_AT_ONCE
)
).thenReturn(Single.just(listOf()))
@ -105,7 +106,7 @@ class TimelineViewModelTest {
null,
null,
LOAD_AT_ONCE,
TimelineRequestMode.ANY
TimelineRequestMode.NETWORK
)
}
@ -120,7 +121,7 @@ class TimelineViewModelTest {
isNull(),
isNull(),
eq(LOAD_AT_ONCE),
eq(TimelineRequestMode.ANY)
eq(TimelineRequestMode.NETWORK)
)
).thenReturn(
Single.just(
@ -141,7 +142,7 @@ class TimelineViewModelTest {
isNull(),
isNull(),
eq(LOAD_AT_ONCE),
eq(TimelineRequestMode.ANY)
eq(TimelineRequestMode.NETWORK)
)
assertViewUpdated(updates)
@ -193,7 +194,7 @@ class TimelineViewModelTest {
sinceId = null,
sincedIdMinusOne = null,
limit = LOAD_AT_ONCE,
TimelineRequestMode.ANY,
TimelineRequestMode.NETWORK,
)
).thenReturn(Single.error(IOException("test")))
@ -208,7 +209,7 @@ class TimelineViewModelTest {
isNull(),
isNull(),
eq(LOAD_AT_ONCE),
eq(TimelineRequestMode.ANY)
eq(TimelineRequestMode.NETWORK)
)
assertViewUpdated(updates)
@ -221,7 +222,7 @@ class TimelineViewModelTest {
fun `loadInitial, home, with cache, error on load above`() {
val statuses = (5 downTo 1).map { makeStatus(it.toString()) }
setCachedResponse(statuses)
setInitialRefresh("6", statuses)
setInitialRefresh(statuses)
whenever(
timelineRepository.getStatuses(
@ -263,7 +264,7 @@ class TimelineViewModelTest {
).thenReturn(Single.error(IOException("test")))
// Empty on loading above
setLoadAbove("5", "4", listOf())
setInitialRefresh(listOf())
val updates = viewModel.viewUpdates.test()
@ -277,24 +278,65 @@ class TimelineViewModelTest {
assertNull(viewModel.failure)
}
@Test
fun `loadInitial but there's a gap above now`() {
val cachedStatuses = (5 downTo 1).map { makeStatus(it.toString()) }
val newStatuses = (100 downTo 100 - LOAD_AT_ONCE).map { makeStatus(it.toString()) }
setCachedResponse(cachedStatuses)
setInitialRefresh(newStatuses)
runBlocking {
viewModel.loadInitial()
}
clearInvocations(timelineRepository)
runBlocking {
viewModel.refresh().join()
}
val expected = newStatuses.toViewData() +
listOf(StatusViewData.Placeholder(newStatuses.last().id.inc(), false)) +
cachedStatuses.toViewData()
assertHasList(expected)
assertFalse("refreshing", viewModel.isRefreshing)
assertNull("failure is not set", viewModel.failure)
}
@Test
fun `loadInitial but there's overlap`() {
val cachedStatuses = (5 downTo 1).map { makeStatus(it.toString()) }
val newStatuses = (3 + LOAD_AT_ONCE downTo 3).map { makeStatus(it.toString()) }
setCachedResponse(cachedStatuses)
setInitialRefresh(newStatuses)
runBlocking {
viewModel.loadInitial()
}
clearInvocations(timelineRepository)
runBlocking {
viewModel.refresh().join()
}
val expected = (3 + LOAD_AT_ONCE downTo 1).map { makeStatus(it.toString()) }.toViewData()
assertHasList(expected)
assertFalse("refreshing", viewModel.isRefreshing)
assertNull("failure is not set", viewModel.failure)
}
@Test
fun `loads above cached`() {
val cachedStatuses = (5 downTo 1).map { makeStatus(it.toString()) }
setCachedResponse(cachedStatuses)
setInitialRefresh("6", cachedStatuses)
val additionalStatuses = (10 downTo 6)
.map { makeStatus(it.toString()) }
whenever(
timelineRepository.getStatuses(
null,
"5",
"4",
LOAD_AT_ONCE,
TimelineRequestMode.NETWORK
)
).thenReturn(Single.just(additionalStatuses.toEitherList()))
setInitialRefresh(additionalStatuses + cachedStatuses)
runBlocking {
viewModel.loadInitial()
@ -309,19 +351,10 @@ class TimelineViewModelTest {
fun refresh() {
val cachedStatuses = (5 downTo 1).map { makeStatus(it.toString()) }
setCachedResponse(cachedStatuses)
setInitialRefresh("6", cachedStatuses)
val additionalStatuses = listOf(makeStatus("6"))
whenever(
timelineRepository.getStatuses(
null,
"5",
"4",
LOAD_AT_ONCE,
TimelineRequestMode.NETWORK
)
).thenReturn(Single.just(additionalStatuses.toEitherList()))
setInitialRefresh(additionalStatuses + cachedStatuses)
runBlocking {
viewModel.loadInitial()
@ -335,12 +368,12 @@ class TimelineViewModelTest {
whenever(
timelineRepository.getStatuses(
null,
"6",
"5",
null,
null,
LOAD_AT_ONCE,
TimelineRequestMode.NETWORK
)
).thenReturn(Single.just(newStatuses.toEitherList()))
).thenReturn(Single.just((newStatuses + additionalStatuses + cachedStatuses).toEitherList()))
runBlocking {
viewModel.refresh()
@ -354,8 +387,7 @@ class TimelineViewModelTest {
fun `refresh failed`() {
val cachedStatuses = (5 downTo 1).map { makeStatus(it.toString()) }
setCachedResponse(cachedStatuses)
setInitialRefresh("6", cachedStatuses)
setLoadAbove("5", "4", listOf())
setInitialRefresh(cachedStatuses)
runBlocking {
viewModel.loadInitial()
@ -367,8 +399,8 @@ class TimelineViewModelTest {
whenever(
timelineRepository.getStatuses(
null,
"6",
"5",
null,
null,
LOAD_AT_ONCE,
TimelineRequestMode.NETWORK
)
@ -387,10 +419,7 @@ class TimelineViewModelTest {
fun loadMore() {
val cachedStatuses = (10 downTo 5).map { makeStatus(it.toString()) }
setCachedResponse(cachedStatuses)
setInitialRefresh("11", cachedStatuses)
// Nothing above
setLoadAbove("10", "9", listOf())
setInitialRefresh(cachedStatuses)
runBlocking {
viewModel.loadInitial().join()
@ -423,10 +452,7 @@ class TimelineViewModelTest {
fun `loadMore parallel`() {
val cachedStatuses = (10 downTo 5).map { makeStatus(it.toString()) }
setCachedResponse(cachedStatuses)
setInitialRefresh("11", cachedStatuses)
// Nothing above
setLoadAbove("10", "9", listOf())
setInitialRefresh(cachedStatuses)
runBlocking {
viewModel.loadInitial().join()
@ -477,10 +503,7 @@ class TimelineViewModelTest {
fun `loadMore failed`() {
val cachedStatuses = (10 downTo 5).map { makeStatus(it.toString()) }
setCachedResponse(cachedStatuses)
setInitialRefresh("11", cachedStatuses)
// Nothing above
setLoadAbove("10", "9", listOf())
setInitialRefresh(cachedStatuses)
runBlocking {
viewModel.loadInitial().join()
@ -542,10 +565,7 @@ class TimelineViewModelTest {
)
setCachedResponseWithGaps(cachedStatuses)
setInitialRefreshWithGaps("6", cachedStatuses)
// Nothing above
setLoadAbove("5", items = listOf())
setInitialRefreshWithGaps(cachedStatuses)
whenever(
timelineRepository.getStatuses(
@ -584,9 +604,7 @@ class TimelineViewModelTest {
Either.Right(status1)
)
setCachedResponseWithGaps(cachedStatuses)
setInitialRefreshWithGaps("6", cachedStatuses)
setLoadAbove("5", items = listOf())
setInitialRefreshWithGaps(cachedStatuses)
whenever(
timelineRepository.getStatuses(
@ -620,8 +638,7 @@ class TimelineViewModelTest {
val status3 = makeStatus("3")
val statuses = listOf(status5, status4, status3)
setCachedResponse(statuses)
setInitialRefresh("6", statuses)
setLoadAbove("5", "4", listOf())
setInitialRefresh(listOf())
runBlocking { viewModel.loadInitial() }
@ -644,8 +661,7 @@ class TimelineViewModelTest {
val status3 = makeStatus("3")
val statuses = listOf(status5, status4, status3)
setCachedResponse(statuses)
setInitialRefresh("6", statuses)
setLoadAbove("5", "4", listOf())
setInitialRefresh(statuses)
runBlocking { viewModel.loadInitial() }
@ -668,8 +684,7 @@ class TimelineViewModelTest {
val status3 = makeStatus("3")
val statuses = listOf(status5, status4, status3)
setCachedResponse(statuses)
setInitialRefresh("6", statuses)
setLoadAbove("5", "4", listOf())
setInitialRefresh(statuses)
runBlocking { viewModel.loadInitial() }
@ -702,8 +717,7 @@ class TimelineViewModelTest {
val status3 = makeStatus("3")
val statuses = listOf(status5, status4, status3)
setCachedResponse(statuses)
setInitialRefresh("6", statuses)
setLoadAbove("5", "4", listOf())
setInitialRefresh(statuses)
runBlocking { viewModel.loadInitial() }
@ -720,22 +734,6 @@ class TimelineViewModelTest {
assertHasList(listOf(status5, status4.copy(poll = votedPoll), status3).toViewData())
}
private fun setLoadAbove(
above: String,
aboveMinusOne: String? = null,
items: List<TimelineStatus>
) {
whenever(
timelineRepository.getStatuses(
null,
above,
aboveMinusOne,
LOAD_AT_ONCE,
TimelineRequestMode.NETWORK
)
).thenReturn(Single.just(items))
}
private fun assertHasList(aList: List<StatusViewData>) {
assertEquals(
aList,
@ -747,8 +745,8 @@ class TimelineViewModelTest {
assertTrue("There were view updates", updates.values().isNotEmpty())
}
private fun setInitialRefresh(maxId: String?, statuses: List<Status>) {
setInitialRefreshWithGaps(maxId, statuses.toEitherList())
private fun setInitialRefresh(statuses: List<Status>) {
setInitialRefreshWithGaps(statuses.toEitherList())
}
private fun setCachedResponse(initialResponse: List<Status>) {
@ -768,10 +766,10 @@ class TimelineViewModelTest {
.thenReturn(Single.just(initialResponse))
}
private fun setInitialRefreshWithGaps(maxId: String?, statuses: List<TimelineStatus>) {
private fun setInitialRefreshWithGaps(statuses: List<TimelineStatus>) {
whenever(
timelineRepository.getStatuses(
maxId,
null,
null,
null,
LOAD_AT_ONCE,

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