385 lines
No EOL
12 KiB
Dart
385 lines
No EOL
12 KiB
Dart
import 'dart:async';
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import 'dart:convert';
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import 'dart:io';
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import 'package:flutter/widgets.dart';
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import 'package:hive_flutter/hive_flutter.dart';
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import 'package:http/http.dart' as http;
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import 'package:logging/logging.dart';
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import 'package:contacts_plus_plus/apis/friend_api.dart';
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import 'package:contacts_plus_plus/apis/message_api.dart';
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import 'package:contacts_plus_plus/apis/user_api.dart';
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import 'package:contacts_plus_plus/clients/notification_client.dart';
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import 'package:contacts_plus_plus/models/friend.dart';
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import 'package:contacts_plus_plus/clients/api_client.dart';
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import 'package:contacts_plus_plus/config.dart';
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import 'package:contacts_plus_plus/models/message.dart';
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enum EventType {
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unknown,
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message,
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unknown1,
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unknown2,
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unknown3,
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unknown4,
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keepAlive,
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error;
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}
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enum EventTarget {
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unknown,
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messageSent,
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receiveMessage,
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messagesRead;
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factory EventTarget.parse(String? text) {
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if (text == null) return EventTarget.unknown;
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return EventTarget.values.firstWhere((element) => element.name.toLowerCase() == text.toLowerCase(),
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orElse: () => EventTarget.unknown,
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);
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}
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}
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class MessagingClient extends ChangeNotifier {
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static const String _eofChar = " ";
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static const String _negotiationPacket = "{\"protocol\":\"json\", \"version\":1}$_eofChar";
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static const List<int> _reconnectTimeoutsSeconds = [0, 5, 10, 20, 60];
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static const Duration _autoRefreshDuration = Duration(seconds: 10);
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static const Duration _unreadSafeguardDuration = Duration(seconds: 120);
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static const String _messageBoxKey = "message-box";
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static const String _lastUpdateKey = "__last-update-time";
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final ApiClient _apiClient;
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final List<Friend> _sortedFriendsCache = []; // Keep a sorted copy so as to not have to sort during build()
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final Map<String, MessageCache> _messageCache = {};
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final Map<String, List<Message>> _unreads = {};
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final Logger _logger = Logger("NeosHub");
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final NotificationClient _notificationClient;
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Friend? selectedFriend;
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Timer? _notifyOnlineTimer;
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Timer? _autoRefresh;
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Timer? _unreadSafeguard;
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int _attempts = 0;
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WebSocket? _wsChannel;
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bool _isConnecting = false;
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String? _initStatus;
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MessagingClient({required ApiClient apiClient, required NotificationClient notificationClient})
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: _apiClient = apiClient, _notificationClient = notificationClient {
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Hive.openBox(_messageBoxKey).then((box) async {
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box.delete(_lastUpdateKey);
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await refreshFriendsListWithErrorHandler();
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await _refreshUnreads();
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});
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_startWebsocket();
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_notifyOnlineTimer = Timer.periodic(const Duration(seconds: 60), (timer) async {
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// We should probably let the MessagingClient handle the entire state of USerStatus instead of mirroring like this
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// but I don't feel like implementing that right now.
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UserApi.setStatus(apiClient, status: await UserApi.getUserStatus(apiClient, userId: apiClient.userId));
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});
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}
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@override
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void dispose() {
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_autoRefresh?.cancel();
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_notifyOnlineTimer?.cancel();
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_wsChannel?.close();
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super.dispose();
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}
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String? get initStatus => _initStatus;
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bool get websocketConnected => _wsChannel != null;
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List<Friend> get cachedFriends => _sortedFriendsCache;
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List<Message> getUnreadsForFriend(Friend friend) => _unreads[friend.id] ?? [];
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bool friendHasUnreads(Friend friend) => _unreads.containsKey(friend.id);
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bool messageIsUnread(Message message) => _unreads[message.senderId]?.any((element) => element.id == message.id) ?? false;
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Friend? getAsFriend(String userId) => Friend.fromMapOrNull(Hive.box(_messageBoxKey).get(userId));
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MessageCache? getUserMessageCache(String userId) => _messageCache[userId];
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MessageCache _createUserMessageCache(String userId) => MessageCache(apiClient: _apiClient, userId: userId);
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Future<void> refreshFriendsListWithErrorHandler () async {
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try {
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await refreshFriendsList();
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} catch (e) {
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_initStatus = "$e";
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notifyListeners();
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}
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}
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Future<void> refreshFriendsList() async {
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DateTime? lastUpdateUtc = Hive.box(_messageBoxKey).get(_lastUpdateKey);
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_autoRefresh?.cancel();
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_autoRefresh = Timer(_autoRefreshDuration, () => refreshFriendsList());
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final friends = await FriendApi.getFriendsList(_apiClient, lastStatusUpdate: lastUpdateUtc);
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for (final friend in friends) {
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await _updateFriend(friend);
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}
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_initStatus = "";
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notifyListeners();
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}
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void sendMessage(Message message) async {
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final msgBody = message.toMap();
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final data = {
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"type": EventType.message.index,
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"target": "SendMessage",
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"arguments": [
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msgBody
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],
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};
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_sendData(data);
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final cache = getUserMessageCache(message.recipientId) ?? _createUserMessageCache(message.recipientId);
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cache.addMessage(message);
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notifyListeners();
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}
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void markMessagesRead(MarkReadBatch batch) {
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final msgBody = batch.toMap();
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final data = {
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"type": EventType.message.index,
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"target": "MarkMessagesRead",
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"arguments": [
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msgBody
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],
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};
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_sendData(data);
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clearUnreadsForUser(batch.senderId);
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}
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void addUnread(Message message) {
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var messages = _unreads[message.senderId];
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if (messages == null) {
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messages = [message];
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_unreads[message.senderId] = messages;
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} else {
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messages.add(message);
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}
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messages.sort();
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_sortFriendsCache();
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_notificationClient.showUnreadMessagesNotification(messages.reversed);
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notifyListeners();
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}
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void updateAllUnreads(List<Message> messages) {
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_unreads.clear();
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for (final msg in messages) {
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if (msg.senderId != _apiClient.userId) {
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final value = _unreads[msg.senderId];
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if (value == null) {
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_unreads[msg.senderId] = [msg];
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} else {
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value.add(msg);
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}
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}
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}
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}
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void clearUnreadsForUser(String userId) {
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_unreads[userId]?.clear();
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notifyListeners();
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}
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void deleteUserMessageCache(String userId) {
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_messageCache.remove(userId);
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}
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Future<void> loadUserMessageCache(String userId) async {
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final cache = getUserMessageCache(userId) ?? _createUserMessageCache(userId);
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await cache.loadMessages();
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_messageCache[userId] = cache;
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notifyListeners();
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}
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Future<void> updateFriendStatus(String userId) async {
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final friend = getAsFriend(userId);
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if (friend == null) return;
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final newStatus = await UserApi.getUserStatus(_apiClient, userId: userId);
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await _updateFriend(friend.copyWith(userStatus: newStatus));
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notifyListeners();
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}
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void resetInitStatus() {
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_initStatus = null;
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notifyListeners();
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}
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Future<void> _refreshUnreads() async {
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_unreadSafeguard?.cancel();
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try {
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final unreadMessages = await MessageApi.getUserMessages(_apiClient, unreadOnly: true);
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updateAllUnreads(unreadMessages.toList());
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} catch (_) {}
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_unreadSafeguard = Timer(_unreadSafeguardDuration, _refreshUnreads);
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}
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void _sortFriendsCache() {
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_sortedFriendsCache.sort((a, b) {
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var aVal = friendHasUnreads(a) ? -3 : 0;
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var bVal = friendHasUnreads(b) ? -3 : 0;
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aVal -= a.latestMessageTime.compareTo(b.latestMessageTime);
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aVal += a.userStatus.onlineStatus.compareTo(b.userStatus.onlineStatus) * 2;
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return aVal.compareTo(bVal);
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});
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}
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Future<void> _updateFriend(Friend friend) async {
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final box = Hive.box(_messageBoxKey);
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box.put(friend.id, friend.toMap());
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final lastStatusUpdate = box.get(_lastUpdateKey);
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if (lastStatusUpdate == null || friend.userStatus.lastStatusChange.isAfter(lastStatusUpdate)) {
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await box.put(_lastUpdateKey, friend.userStatus.lastStatusChange);
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}
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final sIndex = _sortedFriendsCache.indexWhere((element) => element.id == friend.id);
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if (sIndex == -1) {
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_sortedFriendsCache.add(friend);
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} else {
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_sortedFriendsCache[sIndex] = friend;
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}
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_sortFriendsCache();
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}
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// ===== Websocket Stuff =====
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void _onDisconnected(error) async {
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_wsChannel = null;
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_logger.warning("Neos Hub connection died with error '$error', reconnecting...");
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await _startWebsocket();
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}
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Future<void> _startWebsocket() async {
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if (!_apiClient.isAuthenticated) {
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_logger.info("Tried to connect to Neos Hub without authentication, this is probably fine for now.");
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return;
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}
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if (_isConnecting) {
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return;
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}
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_isConnecting = true;
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_wsChannel = await _tryConnect();
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_isConnecting = false;
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_logger.info("Connected to Neos Hub.");
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_wsChannel!.done.then((error) => _onDisconnected(error));
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_wsChannel!.listen(_handleEvent, onDone: () => _onDisconnected("Connection closed."), onError: _onDisconnected);
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_wsChannel!.add(_negotiationPacket);
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}
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Future<WebSocket> _tryConnect() async {
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while (true) {
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try {
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final http.Response response;
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try {
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response = await http.post(
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Uri.parse("${Config.neosHubUrl}/negotiate"),
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headers: _apiClient.authorizationHeader,
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);
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ApiClient.checkResponse(response);
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} catch (e) {
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throw "Failed to acquire connection info from Neos API: $e";
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}
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final body = jsonDecode(response.body);
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final url = (body["url"] as String?)?.replaceFirst("https://", "wss://");
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final wsToken = body["accessToken"];
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if (url == null || wsToken == null) {
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throw "Invalid response from server.";
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}
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final ws = await WebSocket.connect("$url&access_token=$wsToken");
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_attempts = 0;
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return ws;
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} catch (e) {
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final timeout = _reconnectTimeoutsSeconds[_attempts.clamp(0, _reconnectTimeoutsSeconds.length - 1)];
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_logger.severe(e);
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_logger.severe("Retrying in $timeout seconds");
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await Future.delayed(Duration(seconds: timeout));
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_attempts++;
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}
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}
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}
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void _handleEvent(event) {
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final body = jsonDecode((event.toString().replaceAll(_eofChar, "")));
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final int rawType = body["type"] ?? 0;
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if (rawType > EventType.values.length) {
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_logger.info("Unhandled event type $rawType: $body");
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return;
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}
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switch (EventType.values[rawType]) {
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case EventType.unknown1:
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case EventType.unknown2:
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case EventType.unknown3:
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case EventType.unknown4:
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case EventType.unknown:
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_logger.info("Received unknown event: $rawType: $body");
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break;
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case EventType.message:
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_logger.info("Received message-event.");
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_handleMessageEvent(body);
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break;
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case EventType.keepAlive:
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_logger.info("Received keep-alive.");
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break;
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case EventType.error:
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_logger.severe("Received error-event: ${body["error"]}");
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// Should we trigger a manual reconnect here or just let the remote service close the connection?
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break;
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}
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}
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void _handleMessageEvent(body) async {
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final target = EventTarget.parse(body["target"]);
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final args = body["arguments"];
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switch (target) {
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case EventTarget.unknown:
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_logger.info("Unknown event-target in message: $body");
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return;
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case EventTarget.messageSent:
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final msg = args[0];
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final message = Message.fromMap(msg, withState: MessageState.sent);
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final cache = getUserMessageCache(message.recipientId) ?? _createUserMessageCache(message.recipientId);
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cache.addMessage(message);
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notifyListeners();
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break;
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case EventTarget.receiveMessage:
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final msg = args[0];
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final message = Message.fromMap(msg);
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final cache = getUserMessageCache(message.senderId) ?? _createUserMessageCache(message.senderId);
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cache.addMessage(message);
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if (message.senderId != selectedFriend?.id) {
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addUnread(message);
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updateFriendStatus(message.senderId);
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}
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notifyListeners();
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break;
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case EventTarget.messagesRead:
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final messageIds = args[0]["ids"] as List;
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final recipientId = args[0]["recipientId"];
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if (recipientId == null) break;
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final cache = getUserMessageCache(recipientId);
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if (cache == null) break;
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for (var id in messageIds) {
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cache.setMessageState(id, MessageState.read);
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}
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notifyListeners();
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break;
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}
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}
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void _sendData(data) {
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if (_wsChannel == null) throw "Neos Hub is not connected";
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_wsChannel!.add(jsonEncode(data)+_eofChar);
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}
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} |