/// <summary>
/// Connected handler
/// Switches user to different pool for connected users and updates his status to online
/// </summary>
/// <param name="exception"></param>
/// <returns></returns>
public override async Task OnConnectedAsync()
{
var userId = Context.User.Identity.Name; // fetch id
DisconnectedParticipants.TryGetValue(userId, out var disconnectedParticipant); // get from disconnected participants
AllConnectedParticipants.TryGetValue(userId, out var connectedParticipant); // get from disconnected participants
if (disconnectedParticipant != null && connectedParticipant == null)
{
// if participant exists in disconnected dictionary. Move it to Connected
disconnectedParticipant.Participant.Status = ChatParticipantStatus.Online;
DisconnectedParticipants.TryRemove(userId, out var removedParticipant);
AllConnectedParticipants.TryAdd(userId, removedParticipant);
await Clients.All.SendAsync("friendsListChanged");
}
// if participant doesn't exist in disconnected dict. Fetch user and move it to Connected dictionary
if (disconnectedParticipant == null && connectedParticipant == null)
{
var user = await _mediator.Send(new GetUserRequest(Guid.Parse(userId)));
var newParticipant = _mapper.Map <ParticipantResponseViewModel>(user);
newParticipant.Participant.Status = ChatParticipantStatus.Online;
AllConnectedParticipants.TryAdd(userId, newParticipant);
}
// else if connected participant exists.. do nothing because user probably logged in on multiple browsers
}
/// <summary>
/// Disconnected handler
/// Switches user to different pool for disconnected users and updates his status to offline
/// </summary>
/// <param name="exception"></param>
/// <returns></returns>
public override async Task OnDisconnectedAsync(Exception exception)
{
var userId = Context.User.Identity.Name;
AllConnectedParticipants.TryGetValue(userId, out var participant);
if (participant != null)
{
participant.Participant.Status = ChatParticipantStatus.Offline;
AllConnectedParticipants.TryRemove(userId, out var removedParticipant);
DisconnectedParticipants.TryAdd(userId, removedParticipant);
await Clients.All.SendAsync("friendsListChanged");
}
}