mirror of
https://gitlab.com/veilid/veilidchat.git
synced 2025-07-24 07:00:47 -04:00
316 lines
11 KiB
Dart
316 lines
11 KiB
Dart
// A Conversation is a type of Chat that is 1:1 between two Contacts only
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// Each Contact in the ContactList has at most one Conversation between the
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// remote contact and the local account
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import 'dart:async';
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import 'dart:convert';
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import 'package:async_tools/async_tools.dart';
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import 'package:equatable/equatable.dart';
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import 'package:flutter_bloc/flutter_bloc.dart';
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import 'package:meta/meta.dart';
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import 'package:protobuf/protobuf.dart';
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import 'package:veilid_support/veilid_support.dart';
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import '../../account_manager/account_manager.dart';
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import '../../proto/proto.dart' as proto;
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const _sfUpdateAccountChange = 'updateAccountChange';
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@immutable
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class ConversationState extends Equatable {
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const ConversationState(
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{required this.localConversation, required this.remoteConversation});
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final proto.Conversation? localConversation;
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final proto.Conversation? remoteConversation;
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@override
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List<Object?> get props => [localConversation, remoteConversation];
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@override
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String toString() => 'ConversationState('
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'localConversation: ${DynamicDebug.toDebug(localConversation)}, '
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'remoteConversation: ${DynamicDebug.toDebug(remoteConversation)}'
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')';
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}
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/// Represents the control channel between two contacts
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/// Used to pass profile, identity and status changes, and the messages key for
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/// 1-1 chats
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class ConversationCubit extends Cubit<AsyncValue<ConversationState>> {
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ConversationCubit(
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{required AccountInfo accountInfo,
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required TypedKey remoteIdentityPublicKey,
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TypedKey? localConversationRecordKey,
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TypedKey? remoteConversationRecordKey})
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: _accountInfo = accountInfo,
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_remoteIdentityPublicKey = remoteIdentityPublicKey,
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super(const AsyncValue.loading()) {
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_identityWriter = _accountInfo.identityWriter;
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if (localConversationRecordKey != null) {
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_initWait.add((_) async {
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await _setLocalConversation(() async {
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// Open local record key if it is specified
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final pool = DHTRecordPool.instance;
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final crypto = await _cachedConversationCrypto();
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final writer = _identityWriter;
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final record = await pool.openRecordWrite(
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localConversationRecordKey, writer,
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debugName: 'ConversationCubit::LocalConversation',
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parent: accountInfo.accountRecordKey,
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crypto: crypto);
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return record;
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});
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});
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}
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if (remoteConversationRecordKey != null) {
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_initWait.add((cancel) async {
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await _setRemoteConversation(() async {
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// Open remote record key if it is specified
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final pool = DHTRecordPool.instance;
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final crypto = await _cachedConversationCrypto();
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final record = await pool.openRecordRead(remoteConversationRecordKey,
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debugName: 'ConversationCubit::RemoteConversation',
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parent:
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await pool.getParentRecordKey(remoteConversationRecordKey) ??
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accountInfo.accountRecordKey,
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crypto: crypto);
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return record;
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});
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});
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}
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}
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@override
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Future<void> close() async {
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await _initWait();
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await _accountSubscription?.cancel();
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await _localSubscription?.cancel();
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await _remoteSubscription?.cancel();
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await _localConversationCubit?.close();
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await _remoteConversationCubit?.close();
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await super.close();
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}
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////////////////////////////////////////////////////////////////////////////
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// Public Interface
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/// Initialize a local conversation
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/// If we were the initiator of the conversation there may be an
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/// incomplete 'existingConversationRecord' that we need to fill
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/// in now that we have the remote identity key
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/// The ConversationCubit must not already have a local conversation
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/// Returns the local conversation record key that was initialized
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Future<TypedKey> initLocalConversation(
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{required proto.Profile profile,
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TypedKey? existingConversationRecordKey}) async {
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assert(_localConversationCubit == null,
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'must not have a local conversation yet');
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final pool = DHTRecordPool.instance;
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final crypto = await _cachedConversationCrypto();
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final accountRecordKey = _accountInfo.accountRecordKey;
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final writer = _accountInfo.identityWriter;
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// Open with SMPL schema for identity writer
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late final DHTRecord localConversationRecord;
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if (existingConversationRecordKey != null) {
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localConversationRecord = await pool.openRecordWrite(
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existingConversationRecordKey, writer,
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debugName:
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'ConversationCubit::initLocalConversation::LocalConversation',
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parent: accountRecordKey,
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crypto: crypto);
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} else {
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localConversationRecord = await pool.createRecord(
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debugName:
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'ConversationCubit::initLocalConversation::LocalConversation',
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parent: accountRecordKey,
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crypto: crypto,
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writer: writer,
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schema: DHTSchema.smpl(
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oCnt: 0, members: [DHTSchemaMember(mKey: writer.key, mCnt: 1)]));
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}
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await localConversationRecord.deleteScope((localConversation) async {
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await _initLocalMessages(
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localConversationKey: localConversation.key,
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callback: (messages) async {
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// Create initial local conversation key contents
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final conversation = proto.Conversation()
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..profile = profile
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..superIdentityJson =
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jsonEncode(_accountInfo.localAccount.superIdentity.toJson())
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..messages = messages.recordKey.toProto();
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// Write initial conversation to record
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final update = await localConversation.tryWriteProtobuf(
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proto.Conversation.fromBuffer, conversation);
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if (update != null) {
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throw Exception('Failed to write local conversation');
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}
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// If success, save the new local conversation
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// record key in this object
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localConversation.ref();
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await _setLocalConversation(() async => localConversation);
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});
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});
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return localConversationRecord.key;
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}
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/// Force refresh of conversation keys
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// Future<void> refresh() async {
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// await _initWait();
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// final lcc = _localConversationCubit;
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// final rcc = _remoteConversationCubit;
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// if (lcc != null) {
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// await lcc.refreshDefault();
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// }
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// if (rcc != null) {
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// await rcc.refreshDefault();
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// }
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// }
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/// Watch for account record changes and update the conversation
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void watchAccountChanges(Stream<AsyncValue<proto.Account>> accountStream,
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AsyncValue<proto.Account> currentState) {
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assert(_accountSubscription == null, 'only watch account once');
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_accountSubscription = accountStream.listen(_updateAccountChange);
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_updateAccountChange(currentState);
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}
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////////////////////////////////////////////////////////////////////////////
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// Private Implementation
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void _updateAccountChange(AsyncValue<proto.Account> avaccount) {
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final account = avaccount.asData?.value;
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if (account == null) {
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return;
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}
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final cubit = _localConversationCubit;
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if (cubit == null) {
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return;
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}
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serialFuture((this, _sfUpdateAccountChange), () async {
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await cubit.record?.eventualUpdateProtobuf(proto.Conversation.fromBuffer,
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(old) async {
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if (old == null || old.profile == account.profile) {
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return null;
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}
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return old.deepCopy()..profile = account.profile;
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});
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});
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}
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void _updateLocalConversationState(AsyncValue<proto.Conversation> avconv) {
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final newState = avconv.when(
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data: (conv) {
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_incrementalState = ConversationState(
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localConversation: conv,
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remoteConversation: _incrementalState.remoteConversation);
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return AsyncValue.data(_incrementalState);
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},
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loading: AsyncValue<ConversationState>.loading,
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error: AsyncValue<ConversationState>.error,
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);
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emit(newState);
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}
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void _updateRemoteConversationState(AsyncValue<proto.Conversation> avconv) {
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final newState = avconv.when(
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data: (conv) {
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_incrementalState = ConversationState(
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localConversation: _incrementalState.localConversation,
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remoteConversation: conv);
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return AsyncValue.data(_incrementalState);
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},
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loading: AsyncValue<ConversationState>.loading,
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error: AsyncValue<ConversationState>.error,
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);
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emit(newState);
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}
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// Open local converation key
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Future<void> _setLocalConversation(Future<DHTRecord> Function() open) async {
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assert(_localConversationCubit == null,
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'should not set local conversation twice');
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_localConversationCubit = DefaultDHTRecordCubit(
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open: open, decodeState: proto.Conversation.fromBuffer);
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await _localConversationCubit!.ready();
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_localSubscription =
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_localConversationCubit!.stream.listen(_updateLocalConversationState);
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_updateLocalConversationState(_localConversationCubit!.state);
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}
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// Open remote converation key
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Future<void> _setRemoteConversation(Future<DHTRecord> Function() open) async {
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assert(_remoteConversationCubit == null,
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'should not set remote conversation twice');
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_remoteConversationCubit = DefaultDHTRecordCubit(
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open: open, decodeState: proto.Conversation.fromBuffer);
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await _remoteConversationCubit!.ready();
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_remoteSubscription =
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_remoteConversationCubit!.stream.listen(_updateRemoteConversationState);
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_updateRemoteConversationState(_remoteConversationCubit!.state);
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}
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// Initialize local messages
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Future<T> _initLocalMessages<T>({
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required TypedKey localConversationKey,
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required FutureOr<T> Function(DHTLog) callback,
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}) async {
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final crypto = await _cachedConversationCrypto();
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final writer = _identityWriter;
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return (await DHTLog.create(
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debugName: 'ConversationCubit::initLocalMessages::LocalMessages',
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parent: localConversationKey,
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crypto: crypto,
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writer: writer))
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.deleteScope((messages) async => await callback(messages));
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}
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Future<VeilidCrypto> _cachedConversationCrypto() async {
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var conversationCrypto = _conversationCrypto;
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if (conversationCrypto != null) {
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return conversationCrypto;
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}
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conversationCrypto =
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await _accountInfo.makeConversationCrypto(_remoteIdentityPublicKey);
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_conversationCrypto = conversationCrypto;
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return conversationCrypto;
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}
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////////////////////////////////////////////////////////////////////////////
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// Fields
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TypedKey get remoteIdentityPublicKey => _remoteIdentityPublicKey;
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final AccountInfo _accountInfo;
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late final KeyPair _identityWriter;
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final TypedKey _remoteIdentityPublicKey;
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DefaultDHTRecordCubit<proto.Conversation>? _localConversationCubit;
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DefaultDHTRecordCubit<proto.Conversation>? _remoteConversationCubit;
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StreamSubscription<AsyncValue<proto.Conversation>>? _localSubscription;
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StreamSubscription<AsyncValue<proto.Conversation>>? _remoteSubscription;
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StreamSubscription<AsyncValue<proto.Account>>? _accountSubscription;
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var _incrementalState = const ConversationState(
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localConversation: null, remoteConversation: null);
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VeilidCrypto? _conversationCrypto;
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final WaitSet<void, void> _initWait = WaitSet();
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}
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