public override async Task OnConnectedAsync()
{
try
{
var name = Context.User.Identity.Name;
var response = Context.GetHttpContext().Response;
var fromUrl = response.Headers["Access-Control-Allow-Origin"];
var isHostConnected = false;
var key = Context.GetHttpContext().Request.Query["key"];
_logger.LogDebug($"Connecting with Access Key:{key}...");
if (!_visitor.HasVisitorAccess(fromUrl, key))
{
throw new HubException("Invalid access key for the origin. Please check your access key");
}
if (string.IsNullOrEmpty(name))
{
//Monitor usage example
if (Monitor.TryEnter(_syncObject, _timeoutWait))
{
try
{
var userId = _random.Next(0, 10);
name = $"WebUser{userId.ToString()}";
}
finally
{
Monitor.Exit(_syncObject);
}
}
else
{
_logger.LogDebug("Can not assign name");
}
}
else
{
name = _configuration["HostUser:Name"];
await Clients.All.SendAsync("SayHello", "online");
isHostConnected = true;
}
_visitor.LetInVisitor(Context.ConnectionId ?? Guid.NewGuid().ToString(), name, fromUrl);
_logger.LogDebug($"{name} is connected.");
var host = _db.Connections.Where(c => c.User.UserName == _configuration["HostUser:Name"] && c.Connected)
.OrderByDescending(c => c.ConnectionDate)
.FirstOrDefault();
await Clients.Caller.SendAsync("GiveName", name);
if (!isHostConnected)
{
await SendWelcomeMessage(new ChatMessage()
{
Message = "How can I help you?",
Username = _configuration["HostUser:Name"],
FriendlyUsername = _configuration["HostUser:Name"],
});
}
if (host != null)
{
_logger.LogDebug($"Host{ host.ConnectionID} is already connected. Informing host...");
await Clients.Client(host.ConnectionID).SendAsync("iamin", name);
}
await base.OnConnectedAsync();
}
catch (System.Exception ex)
{
_logger.LogError(ex, $"Connection failed: {ex.Message}");
throw ex;
}
}