/// <summary>
/// Inform all users that a specific user has left a room/the server
/// </summary>
/// <param name="useridentifier"></param>
/// <returns></returns>
private async Task InformServerAboutLeavingUser(UserLeaveMessage message)
{
if (_chatrooms.TryGetValue(message.RoomIdentifier, out ChatRoom room))
{
string serialized = JsonConvert.SerializeObject(message, Global.SerializerSettings);
await SendMessageIntoRoom(room, serialized);
}
}
/// <summary>
/// Closes the user's websocket, removes him from the server and informs the other users that he is disconnected
/// </summary>
/// <param name="userIdentifier"></param>
/// <returns></returns>
public async Task DisconnectUserFromServer(string userIdentifier)
{
bool proceedWithDisconnect = false;
ChatPartner user = null;
lock (_userRemovalLockObject) {
//the socket still has to be in our socket-dictionary and shouldn't be in the list of currently disconnecting users
if (_sockets.TryRemove(userIdentifier, out user) && !_queuedUsersToDisconnect.Contains(userIdentifier))
{
_queuedUsersToDisconnect.Add(userIdentifier);
proceedWithDisconnect = true;
}
else
{
_queuedUsersToDisconnect.Remove(userIdentifier);
}
}
if (proceedWithDisconnect)
{
try
{
await RemoveUserFromAllChatRooms(userIdentifier);
Task closeTask = user.WebSocket.CloseAsync(WebSocketCloseStatus.NormalClosure, "Closing", CancellationToken.None);
closeTask.Wait();
user.WebSocket.Dispose();
}
catch (Exception ex)
{
//catch errors (if the closing of the socket fails)
}
UserLeaveMessage message = new UserLeaveMessage()
{
RoomIdentifier = _globalRoom.RoomIdentifier,
SenderGuid = userIdentifier
};
await InformServerAboutLeavingUser(message);
lock (_userRemovalLockObject)
{
_queuedUsersToDisconnect.Remove(userIdentifier);
}
}
}
/// <summary>
/// Handles the action that a user leaves a room
/// </summary>
/// <param name="message"></param>
/// <returns></returns>
private async Task HandleUserLeavingRoom(UserLeaveMessage message)
{
ChatRoom room = _chatrooms[message.RoomIdentifier];
//remove user from the room
lock (_userRemovalLockObject)
{
room.ConnectedUsers.Remove(message.SenderGuid);
}
//delete the room if it's empty (the global room can't be removed)
//if (room.RoomIdentifier != 0 && room.ConnectedUsers.Count == 0)
//{
// lock(_userRemovalLockObject)
// {
// _chatrooms.TryRemove(room.RoomIdentifier, out ChatRoom dummy);
// }
//}
await InformServerAboutLeavingUser(message);
}
