public async Task Invoke(HttpContext context, IBernmobilService bernmobilService)
{
if (!context.WebSockets.IsWebSocketRequest)
{
return;
}
var socket = await context.WebSockets.AcceptWebSocketAsync();
Thread sender = new Thread(() => StartSending(socket, bernmobilService));
sender.Start();
var runInvoke = true;
while (runInvoke)
{
try
{
var buffer = new byte[4096];
var received = await socket.ReceiveAsync(new ArraySegment <byte>(buffer), CancellationToken.None);
if (received.MessageType == WebSocketMessageType.Close)
{
runInvoke = false;
sender.Interrupt();
return;
}
}
catch (Exception ex)
{
}
}
//TODO - investigate the Kestrel exception thrown when this is the last middleware
//await _next.Invoke(context);
}
private async Task StartSending(WebSocket socket, IBernmobilService bernmobilService)
{
bool keepRunning = true;
while (keepRunning)
{
var vehiclesGeoJson = await bernmobilService.GetVehicles();
var geoJsonString = JsonConvert.SerializeObject(vehiclesGeoJson);
try
{
Thread.Sleep(500);
await socket.SendAsync(new ArraySegment <byte>(Encoding.UTF8.GetBytes(geoJsonString)), WebSocketMessageType.Text, true,
default(CancellationToken));
}
catch (Exception ex)
{
keepRunning = false;
Thread.CurrentThread.Join();
break;
}
}
}
