public void AddSocket(WebSocketItem socket)
{
string sId = CreateConnectionId();
while (!_sockets.TryAdd(sId, socket))
{
sId = CreateConnectionId();
}
}
public async Task SendMessageAsync(WebSocketItem socket, string message)
{
if (socket.Socket.State != WebSocketState.Open)
{
return;
}
await socket.Socket.SendAsync(buffer : new ArraySegment <byte>(array: Encoding.UTF8.GetBytes(message),
offset: 0,
count: message.Length),
messageType : WebSocketMessageType.Text,
endOfMessage : true,
cancellationToken : CancellationToken.None);
}
public async Task Invoke(HttpContext context)
{
if (!context.WebSockets.IsWebSocketRequest)
{
return;
}
var socket = await context.WebSockets.AcceptWebSocketAsync();
var auth = await context.AuthenticateAsync(CookieAuthenticationDefaults.AuthenticationScheme);
var userId = string.Empty;
if (auth.Succeeded)
{
userId = auth.Principal.Identity.Name;
}
if (string.IsNullOrEmpty(userId))
{
await socket.CloseOutputAsync(WebSocketCloseStatus.ProtocolError, "auth error", CancellationToken.None);
return;
}
var socketItem = new WebSocketItem(socket);
socketItem.Items.Add("userId", userId);
await _webSocketHandler.OnConnected(socketItem);
await Receive(socket, async (result, buffer) =>
{
if (result.MessageType == WebSocketMessageType.Text)
{
await _webSocketHandler.ReceiveAsync(socketItem, result, buffer);
return;
}
else if (result.MessageType == WebSocketMessageType.Close)
{
await _webSocketHandler.OnDisconnected(socketItem);
return;
}
});
//TODO - investigate the Kestrel exception thrown when this is the last middleware
//await _next.Invoke(context);
}
public string GetId(WebSocketItem socket)
{
return(_sockets.FirstOrDefault(p => p.Value == socket).Key);
}
public override async Task ReceiveAsync(WebSocketItem socket, WebSocketReceiveResult result, byte[] buffer)
{
string message = Encoding.UTF8.GetString(buffer, 0, result.Count);
await SendMessageToAllAsync(message);
}
public abstract Task ReceiveAsync(WebSocketItem socket, WebSocketReceiveResult result, byte[] buffer);
public virtual async Task OnDisconnected(WebSocketItem socket)
{
await WebSocketConnectionManager.RemoveSocket(WebSocketConnectionManager.GetId(socket));
}
public virtual async Task OnConnected(WebSocketItem socket)
{
WebSocketConnectionManager.AddSocket(socket);
}
