matrix-0.8.13/lib/src/timeline.dart

371 lines
12 KiB
Dart

/*
* Famedly Matrix SDK
* Copyright (C) 2019, 2020, 2021 Famedly GmbH
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as
* published by the Free Software Foundation, either version 3 of the
* License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
import 'dart:async';
import 'package:collection/src/iterable_extensions.dart';
import '../matrix.dart';
/// Represents the timeline of a room. The callback [onUpdate] will be triggered
/// automatically. The initial
/// event list will be retreived when created by the `room.getTimeline()` method.
class Timeline {
final Room room;
final List<Event> events;
/// Map of event ID to map of type to set of aggregated events
final Map<String, Map<String, Set<Event>>> aggregatedEvents = {};
final void Function()? onUpdate;
final void Function(int index)? onChange;
final void Function(int index)? onInsert;
final void Function(int index)? onRemove;
StreamSubscription<EventUpdate>? sub;
StreamSubscription<SyncUpdate>? roomSub;
StreamSubscription<String>? sessionIdReceivedSub;
bool isRequestingHistory = false;
final Map<String, Event> _eventCache = {};
/// Searches for the event in this timeline. If not
/// found, requests from the server. Requested events
/// are cached.
Future<Event?> getEventById(String id) async {
for (final event in events) {
if (event.eventId == id) return event;
}
if (_eventCache.containsKey(id)) return _eventCache[id];
final requestedEvent = await room.getEventById(id);
if (requestedEvent == null) return null;
_eventCache[id] = requestedEvent;
return _eventCache[id];
}
// When fetching history, we will collect them into the `_historyUpdates` set
// first, and then only process all events at once, once we have the full history.
// This ensures that the entire history fetching only triggers `onUpdate` only *once*,
// even if /sync's complete while history is being proccessed.
bool _collectHistoryUpdates = false;
bool get canRequestHistory {
if (events.isEmpty) return true;
return events.last.type != EventTypes.RoomCreate;
}
Future<void> requestHistory(
{int historyCount = Room.defaultHistoryCount}) async {
if (isRequestingHistory) {
return;
}
isRequestingHistory = true;
onUpdate?.call();
try {
// Look up for events in hive first
final eventsFromStore = await room.client.database?.getEventList(
room,
start: events.length,
limit: Room.defaultHistoryCount,
);
if (eventsFromStore != null && eventsFromStore.isNotEmpty) {
events.addAll(eventsFromStore);
final startIndex = events.length - eventsFromStore.length;
final endIndex = events.length;
for (var i = startIndex; i < endIndex; i++) {
onInsert?.call(i);
}
} else {
Logs().v('No more events found in the store. Request from server...');
await room.requestHistory(
historyCount: historyCount,
onHistoryReceived: () {
_collectHistoryUpdates = true;
},
);
}
} finally {
_collectHistoryUpdates = false;
isRequestingHistory = false;
onUpdate?.call();
}
}
Timeline({
required this.room,
List<Event>? events,
this.onUpdate,
this.onChange,
this.onInsert,
this.onRemove,
}) : events = events ?? [] {
sub = room.client.onEvent.stream.listen(_handleEventUpdate);
// If the timeline is limited we want to clear our events cache
roomSub = room.client.onSync.stream
.where((sync) => sync.rooms?.join?[room.id]?.timeline?.limited == true)
.listen(_removeEventsNotInThisSync);
sessionIdReceivedSub =
room.onSessionKeyReceived.stream.listen(_sessionKeyReceived);
// we want to populate our aggregated events
for (final e in this.events) {
addAggregatedEvent(e);
}
}
/// Removes all entries from [events] which are not in this SyncUpdate.
void _removeEventsNotInThisSync(SyncUpdate sync) {
final newSyncEvents = sync.rooms?.join?[room.id]?.timeline?.events ?? [];
final keepEventIds = newSyncEvents.map((e) => e.eventId);
events.removeWhere((e) => !keepEventIds.contains(e.eventId));
}
/// Don't forget to call this before you dismiss this object!
void cancelSubscriptions() {
sub?.cancel();
roomSub?.cancel();
sessionIdReceivedSub?.cancel();
}
void _sessionKeyReceived(String sessionId) async {
var decryptAtLeastOneEvent = false;
final decryptFn = () async {
final encryption = room.client.encryption;
if (!room.client.encryptionEnabled || encryption == null) {
return;
}
for (var i = 0; i < events.length; i++) {
if (events[i].type == EventTypes.Encrypted &&
events[i].messageType == MessageTypes.BadEncrypted &&
events[i].content['session_id'] == sessionId) {
events[i] = await encryption.decryptRoomEvent(room.id, events[i],
store: true);
onChange?.call(i);
if (events[i].type != EventTypes.Encrypted) {
decryptAtLeastOneEvent = true;
}
}
}
};
if (room.client.database != null) {
await room.client.database?.transaction(decryptFn);
} else {
await decryptFn();
}
if (decryptAtLeastOneEvent) onUpdate?.call();
}
/// Request the keys for undecryptable events of this timeline
void requestKeys() {
for (final event in events) {
if (event.type == EventTypes.Encrypted &&
event.messageType == MessageTypes.BadEncrypted &&
event.content['can_request_session'] == true) {
try {
room.client.encryption?.keyManager.maybeAutoRequest(room.id,
event.content['session_id'], event.content['sender_key']);
} catch (_) {
// dispose
}
}
}
}
/// Set the read marker to the last synced event in this timeline.
Future<void> setReadMarker([String? eventId]) async {
eventId ??=
events.firstWhereOrNull((event) => event.status.isSynced)?.eventId;
if (eventId == null) return;
return room.setReadMarker(eventId, mRead: eventId);
}
int _findEvent({String? event_id, String? unsigned_txid}) {
// we want to find any existing event where either the passed event_id or the passed unsigned_txid
// matches either the event_id or transaction_id of the existing event.
// For that we create two sets, searchNeedle, what we search, and searchHaystack, where we check if there is a match.
// Now, after having these two sets, if the intersect between them is non-empty, we know that we have at least one match in one pair,
// thus meaning we found our element.
final searchNeedle = <String>{};
if (event_id != null) {
searchNeedle.add(event_id);
}
if (unsigned_txid != null) {
searchNeedle.add(unsigned_txid);
}
int i;
for (i = 0; i < events.length; i++) {
final searchHaystack = <String>{events[i].eventId};
final txnid = events[i].unsigned?['transaction_id'];
if (txnid != null) {
searchHaystack.add(txnid);
}
if (searchNeedle.intersection(searchHaystack).isNotEmpty) {
break;
}
}
return i;
}
void _removeEventFromSet(Set<Event> eventSet, Event event) {
eventSet.removeWhere((e) =>
e.matchesEventOrTransactionId(event.eventId) ||
(event.unsigned != null &&
e.matchesEventOrTransactionId(event.unsigned?['transaction_id'])));
}
void addAggregatedEvent(Event event) {
// we want to add an event to the aggregation tree
final relationshipType = event.relationshipType;
final relationshipEventId = event.relationshipEventId;
if (relationshipType == null || relationshipEventId == null) {
return; // nothing to do
}
final events = (aggregatedEvents[relationshipEventId] ??=
<String, Set<Event>>{})[relationshipType] ??= <Event>{};
// remove a potential old event
_removeEventFromSet(events, event);
// add the new one
events.add(event);
if (onChange != null) {
final index = _findEvent(event_id: relationshipEventId);
onChange?.call(index);
}
}
void removeAggregatedEvent(Event event) {
aggregatedEvents.remove(event.eventId);
if (event.unsigned != null) {
aggregatedEvents.remove(event.unsigned?['transaction_id']);
}
for (final types in aggregatedEvents.values) {
for (final events in types.values) {
_removeEventFromSet(events, event);
}
}
}
void _handleEventUpdate(EventUpdate eventUpdate, {bool update = true}) {
try {
if (eventUpdate.roomID != room.id) return;
if (eventUpdate.type != EventUpdateType.timeline &&
eventUpdate.type != EventUpdateType.history) {
return;
}
final status = eventStatusFromInt(eventUpdate.content['status'] ??
(eventUpdate.content['unsigned'] is Map<String, dynamic>
? eventUpdate.content['unsigned'][messageSendingStatusKey]
: null) ??
EventStatus.synced.intValue);
if (status.isRemoved) {
final i = _findEvent(event_id: eventUpdate.content['event_id']);
if (i < events.length) {
removeAggregatedEvent(events[i]);
events.removeAt(i);
onRemove?.call(i);
}
} else {
final i = _findEvent(
event_id: eventUpdate.content['event_id'],
unsigned_txid: eventUpdate.content['unsigned'] is Map
? eventUpdate.content['unsigned']['transaction_id']
: null);
if (i < events.length) {
// if the old status is larger than the new one, we also want to preserve the old status
final oldStatus = events[i].status;
events[i] = Event.fromJson(
eventUpdate.content,
room,
);
// do we preserve the status? we should allow 0 -> -1 updates and status increases
if ((latestEventStatus(status, oldStatus) == oldStatus) &&
!(status.isError && oldStatus.isSending)) {
events[i].status = oldStatus;
}
addAggregatedEvent(events[i]);
onChange?.call(i);
} else {
final newEvent = Event.fromJson(
eventUpdate.content,
room,
);
if (eventUpdate.type == EventUpdateType.history &&
events.indexWhere(
(e) => e.eventId == eventUpdate.content['event_id']) !=
-1) return;
var index = events.length;
if (eventUpdate.type == EventUpdateType.history) {
events.add(newEvent);
} else {
index = events.firstIndexWhereNotError;
events.insert(index, newEvent);
}
onInsert?.call(index);
addAggregatedEvent(newEvent);
}
}
// Handle redaction events
if (eventUpdate.content['type'] == EventTypes.Redaction) {
final index = _findEvent(event_id: eventUpdate.content['redacts']);
if (index < events.length) {
removeAggregatedEvent(events[index]);
// Is the redacted event a reaction? Then update the event this
// belongs to:
if (onChange != null) {
final relationshipEventId = events[index].relationshipEventId;
if (relationshipEventId != null) {
onChange?.call(_findEvent(event_id: relationshipEventId));
}
}
events[index].setRedactionEvent(Event.fromJson(
eventUpdate.content,
room,
));
onChange?.call(index);
}
}
if (update && !_collectHistoryUpdates) {
onUpdate?.call();
}
} catch (e, s) {
Logs().w('Handle event update failed', e, s);
}
}
}
extension on List<Event> {
int get firstIndexWhereNotError {
if (isEmpty) return 0;
final index = indexWhere((event) => !event.status.isError);
if (index == -1) return length;
return index;
}
}