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using System.Collections.Concurrent;
using System.Collections.Frozen;
using System.Collections.ObjectModel;
using System.Security.Cryptography;
using System.Text.Json;
using System.Text.Json.Nodes;
using System.Text.Json.Serialization;
using ArcaneLibs;
using ArcaneLibs.Collections;
using ArcaneLibs.Extensions;
using LibMatrix.EventTypes;
using LibMatrix.EventTypes.Spec.State;
using LibMatrix.Responses;
namespace LibMatrix.HomeserverEmulator.Services;
public class RoomStore {
public ConcurrentBag<Room> _rooms = new();
private Dictionary<string, Room> _roomsById = new();
public RoomStore(HSEConfiguration config) {
if(config.StoreData) {
var path = Path.Combine(config.DataStoragePath, "rooms");
if (!Directory.Exists(path)) Directory.CreateDirectory(path);
foreach (var file in Directory.GetFiles(path)) {
var room = JsonSerializer.Deserialize<Room>(File.ReadAllText(file));
if (room is not null) _rooms.Add(room);
}
}
else
Console.WriteLine("Data storage is disabled, not loading rooms from disk");
RebuildIndexes();
}
private void RebuildIndexes() {
_roomsById = _rooms.ToDictionary(u => u.RoomId);
}
public Room? GetRoomById(string roomId, bool createIfNotExists = false) {
if (_roomsById.TryGetValue(roomId, out var user)) {
return user;
}
if (!createIfNotExists)
return null;
return CreateRoom(new() { });
}
public Room CreateRoom(CreateRoomRequest request) {
var room = new Room(roomId: $"!{Guid.NewGuid().ToString()}");
if (!string.IsNullOrWhiteSpace(request.Name))
room.SetStateInternal(new StateEvent() {
Type = RoomNameEventContent.EventId,
TypedContent = new RoomNameEventContent() {
Name = request.Name
}
});
if (!string.IsNullOrWhiteSpace(request.RoomAliasName))
room.SetStateInternal(new StateEvent() {
Type = RoomCanonicalAliasEventContent.EventId,
TypedContent = new RoomCanonicalAliasEventContent() {
Alias = $"#{request.RoomAliasName}:localhost"
}
});
foreach (var stateEvent in request.InitialState ?? []) {
room.SetStateInternal(stateEvent);
}
_rooms.Add(room);
RebuildIndexes();
return room;
}
public class Room : NotifyPropertyChanged {
private CancellationTokenSource _debounceCts = new();
private ObservableCollection<StateEventResponse> _timeline;
private ObservableDictionary<string,List<StateEventResponse>> _accountData;
public Room(string roomId) {
if (string.IsNullOrWhiteSpace(roomId)) throw new ArgumentException("Value cannot be null or whitespace.", nameof(roomId));
if (roomId[0] != '!') throw new ArgumentException("Room ID must start with !", nameof(roomId));
RoomId = roomId;
State = FrozenSet<StateEventResponse>.Empty;
Timeline = new();
AccountData = new();
}
public string RoomId { get; set; }
public FrozenSet<StateEventResponse> State { get; private set; }
public ObservableCollection<StateEventResponse> Timeline {
get => _timeline;
set {
if (Equals(value, _timeline)) return;
_timeline = new(value);
_timeline.CollectionChanged += (sender, args) => SaveDebounced();
OnPropertyChanged();
}
}
public ObservableDictionary<string, List<StateEventResponse>> AccountData {
get => _accountData;
set {
if (Equals(value, _accountData)) return;
_accountData = new(value);
_accountData.CollectionChanged += (sender, args) => SaveDebounced();
OnPropertyChanged();
}
}
internal StateEventResponse SetStateInternal(StateEvent request) {
var state = new StateEventResponse() {
Type = request.Type,
StateKey = request.StateKey,
EventId = Guid.NewGuid().ToString(),
RoomId = RoomId,
OriginServerTs = DateTimeOffset.Now.ToUnixTimeMilliseconds(),
Sender = "",
RawContent = request.RawContent ?? (request.TypedContent is not null ? new JsonObject() : JsonSerializer.Deserialize<JsonObject>(JsonSerializer.Serialize(request.TypedContent)))
};
Timeline.Add(state);
if(state.StateKey is not null)
// we want state to be deduplicated by type and key, and we want the latest state to be the one that is returned
State = Timeline.Where(s => s.Type == state.Type && s.StateKey == state.StateKey)
.OrderByDescending(s => s.OriginServerTs)
.DistinctBy(x=>(x.Type, x.StateKey))
.ToFrozenSet();
return state;
}
public StateEventResponse AddUser(string userId) {
var state = SetStateInternal(new() {
Type = RoomMemberEventContent.EventId,
StateKey = userId,
TypedContent = new RoomMemberEventContent() {
Membership = "join"
},
});
state.Sender = userId;
return state;
}
public async Task SaveDebounced() {
if (!HSEConfiguration.Current.StoreData) return;
await _debounceCts.CancelAsync();
_debounceCts = new CancellationTokenSource();
try {
await Task.Delay(250, _debounceCts.Token);
// Ensure all state events are in the timeline
State.Where(s=>!Timeline.Contains(s)).ToList().ForEach(s => Timeline.Add(s));
var path = Path.Combine(HSEConfiguration.Current.DataStoragePath, "rooms", $"{RoomId}.json");
Console.WriteLine($"Saving room {RoomId} to {path}!");
await File.WriteAllTextAsync(path, this.ToJson(ignoreNull: true));
}
catch (TaskCanceledException) { }
}
}
}
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