Use member count instead of counting members (#530)

Use member count instead of counting members

For the room details screen, use the member count as supplied by
matrix instead of waiting for the entire member list to be
retrieved and then manually adding up all the relevant users.

This removes the loading state of the member count, relying on
a spinner on the member list itself if the user actually wants
to see the members. (The performance of that will be improved
separately on the rust side in the future)

Closes #505

build.gradle.kts

@@ -221,6 +221,7 @@ koverMerged {
                 excludes += "io.element.android.libraries.matrix.api.timeline.item.event.OtherState$*"
                 excludes += "io.element.android.libraries.matrix.api.timeline.item.event.EventSendState$*"
                 excludes += "io.element.android.libraries.matrix.api.room.RoomMembershipState*"
+                excludes += "io.element.android.libraries.matrix.api.room.MatrixRoomMembersState*"
                 excludes += "io.element.android.libraries.push.impl.notifications.NotificationState*"
                 excludes += "io.element.android.features.messages.impl.media.local.pdf.PdfViewerState"
             }

features/leaveroom/impl/src/main/kotlin/io/element/android/features/leaveroom/impl/LeaveRoomPresenterImpl.kt

@@ -27,15 +27,10 @@ import io.element.android.features.leaveroom.api.LeaveRoomState
 import io.element.android.features.leaveroom.api.LeaveRoomState.Confirmation.Generic
 import io.element.android.features.leaveroom.api.LeaveRoomState.Confirmation.LastUserInRoom
 import io.element.android.features.leaveroom.api.LeaveRoomState.Confirmation.PrivateRoom
-import io.element.android.libraries.architecture.Async
 import io.element.android.libraries.core.coroutine.CoroutineDispatchers
 import io.element.android.libraries.matrix.api.MatrixClient
 import io.element.android.libraries.matrix.api.core.RoomId
-import io.element.android.libraries.matrix.api.room.MatrixRoom
-import io.element.android.libraries.matrix.api.room.MatrixRoomMembersState
 import io.element.android.libraries.matrix.api.room.RoomMembershipObserver
-import io.element.android.libraries.matrix.api.room.RoomMembershipState
-import kotlinx.coroutines.flow.first
 import kotlinx.coroutines.launch
 import timber.log.Timber
 import javax.inject.Inject
@@ -83,7 +78,7 @@ class LeaveRoomPresenterImpl @Inject constructor(
     }
 }
 
-private suspend fun showLeaveRoomAlert(
+private fun showLeaveRoomAlert(
     matrixClient: MatrixClient,
     roomId: RoomId,
     confirmation: MutableState<LeaveRoomState.Confirmation>,
@@ -91,7 +86,7 @@ private suspend fun showLeaveRoomAlert(
     matrixClient.getRoom(roomId)?.use { room ->
         confirmation.value = when {
             !room.isPublic -> PrivateRoom(roomId)
-            (room.memberCount() as? Async.Success<Int>)?.state == 1 -> LastUserInRoom(roomId)
+            room.joinedMemberCount == 1L -> LastUserInRoom(roomId)
             else -> Generic(roomId)
         }
     }
@@ -116,12 +111,3 @@ private suspend fun MatrixClient.leaveRoom(
     }
     progress.value = LeaveRoomState.Progress.Hidden
 }
-
-private suspend fun MatrixRoom.memberCount(): Async<Int> = membersStateFlow.first().let { membersState ->
-    when (membersState) {
-        MatrixRoomMembersState.Unknown -> Async.Uninitialized
-        is MatrixRoomMembersState.Pending -> Async.Loading(prevState = membersState.prevRoomMembers?.size)
-        is MatrixRoomMembersState.Error -> Async.Failure(membersState.failure, prevState = membersState.prevRoomMembers?.size)
-        is MatrixRoomMembersState.Ready -> Async.Success(membersState.roomMembers.count { it.membership == RoomMembershipState.JOIN })
-    }
-}

features/leaveroom/impl/src/test/kotlin/io/element/android/features/leaveroom/impl/LeaveRoomPresenterImplTest.kt

@@ -24,11 +24,7 @@ import io.element.android.features.leaveroom.api.LeaveRoomEvent
 import io.element.android.features.leaveroom.api.LeaveRoomPresenter
 import io.element.android.features.leaveroom.api.LeaveRoomState
 import io.element.android.libraries.matrix.api.MatrixClient
-import io.element.android.libraries.matrix.api.core.UserId
-import io.element.android.libraries.matrix.api.room.MatrixRoomMembersState
-import io.element.android.libraries.matrix.api.room.RoomMember
 import io.element.android.libraries.matrix.api.room.RoomMembershipObserver
-import io.element.android.libraries.matrix.api.room.RoomMembershipState
 import io.element.android.libraries.matrix.api.timeline.item.event.MembershipChange
 import io.element.android.libraries.matrix.test.A_ROOM_ID
 import io.element.android.libraries.matrix.test.FakeMatrixClient
@@ -100,24 +96,7 @@ class LeaveRoomPresenterImplTest {
             client = FakeMatrixClient().apply {
                 givenGetRoomResult(
                     roomId = A_ROOM_ID,
-                    result = FakeMatrixRoom().apply {
+                    result = FakeMatrixRoom(joinedMemberCount = 1),
-                        givenRoomMembersState(
-                            MatrixRoomMembersState.Ready(
-                                listOf(
-                                    RoomMember(
-                                        userId = UserId(value = "@aUserId:aDomain"),
-                                        displayName = null,
-                                        avatarUrl = null,
-                                        membership = RoomMembershipState.JOIN,
-                                        isNameAmbiguous = false,
-                                        powerLevel = 0,
-                                        normalizedPowerLevel = 0,
-                                        isIgnored = false
-                                    )
-                                )
-                            )
-                        )
-                    },
                 )
             }
         )

features/roomdetails/impl/src/main/kotlin/io/element/android/features/roomdetails/impl/RoomDetailsPresenter.kt

@@ -27,12 +27,10 @@ import androidx.compose.runtime.remember
 import io.element.android.features.leaveroom.api.LeaveRoomEvent
 import io.element.android.features.leaveroom.api.LeaveRoomPresenter
 import io.element.android.features.roomdetails.impl.members.details.RoomMemberDetailsPresenter
-import io.element.android.libraries.architecture.Async
 import io.element.android.libraries.architecture.Presenter
 import io.element.android.libraries.matrix.api.room.MatrixRoom
 import io.element.android.libraries.matrix.api.room.MatrixRoomMembersState
 import io.element.android.libraries.matrix.api.room.RoomMember
-import io.element.android.libraries.matrix.api.room.RoomMembershipState
 import io.element.android.libraries.matrix.api.room.StateEventType
 import io.element.android.libraries.matrix.ui.room.getDirectRoomMember
 import javax.inject.Inject
@@ -51,7 +49,6 @@ class RoomDetailsPresenter @Inject constructor(
         }
 
         val membersState by room.membersStateFlow.collectAsState()
-        val memberCount by getMemberCount(membersState)
         val canInvite by getCanInvite(membersState)
         val canEditName by getCanSendStateEvent(membersState, StateEventType.ROOM_NAME)
         val canEditAvatar by getCanSendStateEvent(membersState, StateEventType.ROOM_AVATAR)
@@ -85,7 +82,7 @@ class RoomDetailsPresenter @Inject constructor(
             roomAlias = room.alias,
             roomAvatarUrl = room.avatarUrl,
             roomTopic = topicState,
-            memberCount = memberCount,
+            memberCount = room.joinedMemberCount,
             isEncrypted = room.isEncrypted,
             canInvite = canInvite,
             canEdit = canEditAvatar || canEditName || canEditTopic,
@@ -131,18 +128,4 @@ class RoomDetailsPresenter @Inject constructor(
         }
         return canSendEvent
     }
-
-    @Composable
-    private fun getMemberCount(membersState: MatrixRoomMembersState): State<Async<Int>> {
-        return remember(membersState) {
-            derivedStateOf {
-                when (membersState) {
-                    MatrixRoomMembersState.Unknown -> Async.Uninitialized
-                    is MatrixRoomMembersState.Pending -> Async.Loading(prevState = membersState.prevRoomMembers?.size)
-                    is MatrixRoomMembersState.Error -> Async.Failure(membersState.failure, prevState = membersState.prevRoomMembers?.size)
-                    is MatrixRoomMembersState.Ready -> Async.Success(membersState.roomMembers.count { it.membership == RoomMembershipState.JOIN })
-                }
-            }
-        }
-    }
 }

features/roomdetails/impl/src/main/kotlin/io/element/android/features/roomdetails/impl/RoomDetailsState.kt

@@ -18,7 +18,6 @@ package io.element.android.features.roomdetails.impl
 
 import io.element.android.features.leaveroom.api.LeaveRoomState
 import io.element.android.features.roomdetails.impl.members.details.RoomMemberDetailsState
-import io.element.android.libraries.architecture.Async
 import io.element.android.libraries.matrix.api.room.RoomMember
 
 data class RoomDetailsState(
@@ -27,7 +26,7 @@ data class RoomDetailsState(
     val roomAlias: String?,
     val roomAvatarUrl: String?,
     val roomTopic: RoomTopicState,
-    val memberCount: Async<Int>,
+    val memberCount: Long,
     val isEncrypted: Boolean,
     val roomType: RoomDetailsType,
     val roomMemberDetailsState: RoomMemberDetailsState?,

features/roomdetails/impl/src/main/kotlin/io/element/android/features/roomdetails/impl/RoomDetailsStateProvider.kt

@@ -19,7 +19,6 @@ package io.element.android.features.roomdetails.impl
 import androidx.compose.ui.tooling.preview.PreviewParameterProvider
 import io.element.android.features.leaveroom.api.LeaveRoomState
 import io.element.android.features.roomdetails.impl.members.details.aRoomMemberDetailsState
-import io.element.android.libraries.architecture.Async
 import io.element.android.libraries.matrix.api.core.UserId
 import io.element.android.libraries.matrix.api.room.RoomMember
 import io.element.android.libraries.matrix.api.room.RoomMembershipState
@@ -32,7 +31,6 @@ open class RoomDetailsStateProvider : PreviewParameterProvider<RoomDetailsState>
             aRoomDetailsState().copy(roomTopic = RoomTopicState.CanAddTopic),
             aRoomDetailsState().copy(isEncrypted = false),
             aRoomDetailsState().copy(roomAlias = null),
-            aRoomDetailsState().copy(memberCount = Async.Failure(Throwable())),
             aDmRoomDetailsState().copy(roomName = "Daniel"),
             aDmRoomDetailsState(isDmMemberIgnored = true).copy(roomName = "Daniel"),
             aRoomDetailsState().copy(canInvite = true),
@@ -73,7 +71,7 @@ fun aRoomDetailsState() = RoomDetailsState(
             "|| MAI iki/Marketing " +
             "|| MAI iki/Marketing..."
     ),
-    memberCount = Async.Success(32),
+    memberCount = 32,
     isEncrypted = true,
     canInvite = false,
     canEdit = false,

features/roomdetails/impl/src/main/kotlin/io/element/android/features/roomdetails/impl/RoomDetailsView.kt

@@ -59,7 +59,6 @@ import io.element.android.features.roomdetails.impl.blockuser.BlockUserDialogs
 import io.element.android.features.roomdetails.impl.blockuser.BlockUserSection
 import io.element.android.features.roomdetails.impl.members.details.RoomMemberHeaderSection
 import io.element.android.features.roomdetails.impl.members.details.RoomMemberMainActionsSection
-import io.element.android.libraries.architecture.isLoading
 import io.element.android.libraries.designsystem.ElementTextStyles
 import io.element.android.libraries.designsystem.components.avatar.Avatar
 import io.element.android.libraries.designsystem.components.avatar.AvatarData
@@ -145,10 +144,8 @@ fun RoomDetailsView(
             }
 
             if (state.roomType is RoomDetailsType.Room) {
-                val memberCount = state.memberCount.dataOrNull()
                 MembersSection(
-                    memberCount = memberCount,
+                    memberCount = state.memberCount,
-                    isLoading = state.memberCount.isLoading(),
                     openRoomMemberList = openRoomMemberList,
                 )
 
@@ -273,8 +270,7 @@ internal fun TopicSection(
 
 @Composable
 internal fun MembersSection(
-    memberCount: Int?,
+    memberCount: Long,
-    isLoading: Boolean,
     openRoomMemberList: () -> Unit,
     modifier: Modifier = Modifier,
 ) {
@@ -282,9 +278,8 @@ internal fun MembersSection(
         PreferenceText(
             title = stringResource(R.string.screen_room_details_people_title),
             icon = Icons.Outlined.Person,
-            currentValue = memberCount?.toString(),
+            currentValue = memberCount.toString(),
             onClick = openRoomMemberList,
-            loadingCurrentValue = isLoading,
         )
     }
 }

features/roomdetails/impl/src/test/kotlin/io/element/android/features/roomdetails/RoomDetailsPresenterTests.kt

@@ -26,18 +26,15 @@ import io.element.android.features.roomdetails.impl.RoomDetailsType
 import io.element.android.features.roomdetails.impl.RoomTopicState
 import io.element.android.features.roomdetails.impl.members.aRoomMember
 import io.element.android.features.roomdetails.impl.members.details.RoomMemberDetailsPresenter
-import io.element.android.libraries.architecture.Async
 import io.element.android.libraries.matrix.api.core.RoomId
 import io.element.android.libraries.matrix.api.core.SessionId
 import io.element.android.libraries.matrix.api.core.UserId
 import io.element.android.libraries.matrix.api.room.MatrixRoom
 import io.element.android.libraries.matrix.api.room.MatrixRoomMembersState
-import io.element.android.libraries.matrix.api.room.RoomMembershipState
 import io.element.android.libraries.matrix.api.room.StateEventType
 import io.element.android.libraries.matrix.test.A_ROOM_ID
 import io.element.android.libraries.matrix.test.A_ROOM_NAME
 import io.element.android.libraries.matrix.test.A_SESSION_ID
-import io.element.android.libraries.matrix.test.A_USER_ID
 import io.element.android.libraries.matrix.test.A_USER_ID_2
 import io.element.android.libraries.matrix.test.FakeMatrixClient
 import io.element.android.libraries.matrix.test.room.FakeMatrixRoom
@@ -69,48 +66,13 @@ class RoomDetailsPresenterTests {
             assertThat(initialState.roomName).isEqualTo(room.name)
             assertThat(initialState.roomAvatarUrl).isEqualTo(room.avatarUrl)
             assertThat(initialState.roomTopic).isEqualTo(RoomTopicState.ExistingTopic(room.topic!!))
-            assertThat(initialState.memberCount).isEqualTo(Async.Uninitialized)
+            assertThat(initialState.memberCount).isEqualTo(room.joinedMemberCount)
             assertThat(initialState.isEncrypted).isEqualTo(room.isEncrypted)
 
             cancelAndIgnoreRemainingEvents()
         }
     }
 
-    @Test
-    fun `present - room member count is calculated asynchronously`() = runTest {
-        val error = RuntimeException()
-        val room = aMatrixRoom()
-        val roomMembers = listOf(
-            aRoomMember(A_USER_ID),
-            aRoomMember(A_USER_ID_2, membership = RoomMembershipState.INVITE),
-        )
-        val presenter = aRoomDetailsPresenter(room)
-        moleculeFlow(RecompositionClock.Immediate) {
-            presenter.present()
-        }.test {
-            room.givenRoomMembersState(MatrixRoomMembersState.Unknown)
-            val initialState = awaitItem()
-            assertThat(initialState.memberCount).isEqualTo(Async.Uninitialized)
-            skipItems(1)
-
-            room.givenRoomMembersState(MatrixRoomMembersState.Pending(null))
-            val loadingState = awaitItem()
-            assertThat(loadingState.memberCount).isEqualTo(Async.Loading(null))
-
-            room.givenRoomMembersState(MatrixRoomMembersState.Error(error))
-            skipItems(1)
-            val failureState = awaitItem()
-            assertThat(failureState.memberCount).isEqualTo(Async.Failure(error, null))
-
-            room.givenRoomMembersState(MatrixRoomMembersState.Ready(roomMembers))
-            skipItems(1)
-            val successState = awaitItem()
-            assertThat(successState.memberCount).isEqualTo(Async.Success(1))
-
-            cancelAndIgnoreRemainingEvents()
-        }
-    }
-
     @Test
     fun `present - initial state with no room name`() = runTest {
         val room = aMatrixRoom(name = null)

libraries/matrix/api/src/main/kotlin/io/element/android/libraries/matrix/api/room/MatrixRoom.kt

@@ -43,6 +43,7 @@ interface MatrixRoom : Closeable {
     val isEncrypted: Boolean
     val isDirect: Boolean
     val isPublic: Boolean
+    val joinedMemberCount: Long
 
     /**
      * The current loaded members as a StateFlow.

libraries/matrix/impl/src/main/kotlin/io/element/android/libraries/matrix/impl/room/RustMatrixRoom.kt

@@ -137,6 +137,9 @@ class RustMatrixRoom(
     override val isDirect: Boolean
         get() = innerRoom.isDirect()
 
+    override val joinedMemberCount: Long
+        get() = innerRoom.joinedMembersCount().toLong()
+
     override suspend fun updateMembers(): Result<Unit> = withContext(coroutineDispatchers.io) {
         val currentState = _membersStateFlow.value
         val currentMembers = currentState.roomMembers()

libraries/matrix/test/src/main/kotlin/io/element/android/libraries/matrix/test/room/FakeMatrixRoom.kt

@@ -51,6 +51,7 @@ class FakeMatrixRoom(
     override val alternativeAliases: List<String> = emptyList(),
     override val isPublic: Boolean = true,
     override val isDirect: Boolean = false,
+    override val joinedMemberCount: Long = 123L,
     private val matrixTimeline: MatrixTimeline = FakeMatrixTimeline(),
 ) : MatrixRoom {
 

libraries/matrixui/src/main/kotlin/io/element/android/libraries/matrix/ui/room/MatrixRoomMembers.kt

@@ -55,7 +55,7 @@ fun MatrixRoom.getDirectRoomMember(): State<RoomMember?> {
 @Composable
 fun MatrixRoom.getDirectRoomMember(roomMembersState: MatrixRoomMembersState): State<RoomMember?> {
     val roomMembers = roomMembersState.roomMembers()
-    return remember(roomMembers) {
+    return remember(roomMembersState) {
         derivedStateOf {
             if (roomMembers == null) {
                 null