public async Task Invoke(HttpContext context)
{
var url = context.Request.Path.Value ?? string.Empty;
if (!url.StartsWith("/hystrix.stream", StringComparison.OrdinalIgnoreCase))
{
await _next(context);
return;
}
var nb = Interlocked.Increment(ref _nbConnections);
CancellationTokenSource token = null;
try
{
if (nb > maxConcurrentConnection.Value)
{
context.Response.StatusCode = 503;
context.Response.ContentType = "text/plain";
var buffer = Encoding.ASCII.GetBytes("Max concurrent connections reached.");
context.Response.Body.Write(buffer, 0, buffer.Length);
return;
}
int delay = 1000;
var pos = url.IndexOf("?delay=");
if (pos > 0)
{
try
{
delay = Int32.Parse(url.Substring(pos + 7));
}
catch
{
}
}
//Console.WriteLine( "Sending events..." );
token = new CancellationTokenSource();
var poller = new MetricsPoller(delay, token.Token);
poller.Start();
context.Response.ContentType = "text/event-stream";
context.Response.Headers.Add("Connection", new string[] { "keep-alive" });
context.Response.Headers.Add("Cache-Control", new string[] { "no-cache, no-store, max-age=0, must-revalidate" });
context.Response.Headers.Add("Pragma", new string[] { "no-cache" });
context.Response.StatusCode = 200;
await context.Response.Body.FlushAsync();
var ping = Encoding.UTF8.GetBytes("ping: \n\n");
while (!context.RequestAborted.IsCancellationRequested)
{
var events = poller.GetJsonMetrics();
if (events.Count() == 0)
{
context.Response.Body.Write(ping, 0, ping.Length);
}
else
{
foreach (var json in events)
{
var bytes = Encoding.UTF8.GetBytes(String.Format("data: {0}\n\n", json));
context.Response.Body.Write(bytes, 0, bytes.Length);
}
}
await context.Response.Body.FlushAsync(token.Token);
await Task.Delay(delay, token.Token);
}
}
catch
{
}
finally
{
//Console.WriteLine( "Stop events" );
if (token != null && !token.IsCancellationRequested)
{
token.Cancel();
}
Interlocked.Decrement(ref _nbConnections);
}
}
public async Task Invoke(HttpContext context)
{
var url = context.Request.Path.Value ?? string.Empty;
if (!url.StartsWith("/hystrix.stream", StringComparison.OrdinalIgnoreCase))
{
await _next(context);
return;
}
var nb = Interlocked.Increment(ref _nbConnections);
CancellationTokenSource token = null;
try
{
if (nb > maxConcurrentConnection.Value)
{
context.Response.StatusCode = 503;
context.Response.ContentType = "text/plain";
var buffer = Encoding.ASCII.GetBytes("Max concurrent connections reached.");
context.Response.Body.Write(buffer, 0, buffer.Length);
return;
}
int delay = 1000;
var pos = url.IndexOf("?delay=");
if (pos > 0)
{
try
{
delay = Int32.Parse(url.Substring(pos + 7));
}
catch
{
}
}
//Console.WriteLine( "Sending events..." );
token = new CancellationTokenSource();
var poller = new MetricsPoller(delay, token.Token);
poller.Start();
context.Response.ContentType = "text/event-stream";
context.Response.Headers.Add("Connection", new string[]{"keep-alive"});
context.Response.Headers.Add("Cache-Control", new string[]{"no-cache, no-store, max-age=0, must-revalidate"});
context.Response.Headers.Add("Pragma", new string[]{"no-cache"});
context.Response.StatusCode = 200;
await context.Response.Body.FlushAsync();
var ping = Encoding.UTF8.GetBytes( "ping: \n\n" );
while (!context.RequestAborted.IsCancellationRequested)
{
var events = poller.GetJsonMetrics();
if (events.Count() == 0)
{
context.Response.Body.Write(ping, 0, ping.Length);
}
else
{
foreach (var json in events)
{
var bytes = Encoding.UTF8.GetBytes(String.Format( "data: {0}\n\n", json));
context.Response.Body.Write(bytes, 0, bytes.Length);
}
}
await context.Response.Body.FlushAsync(token.Token);
await Task.Delay(delay, token.Token);
}
}
catch
{
}
finally
{
//Console.WriteLine( "Stop events" );
if (token != null && !token.IsCancellationRequested)
token.Cancel();
Interlocked.Decrement(ref _nbConnections);
}
}