async Task HandleSession(HttpSession session)
{
var closeSessionOnReturn = true;
try
{
var continueSession = true;
while (continueSession && !session.IsDisconnected())
{
try
{
TrackSessionRead(session.Id);
if (await session.ReadToBufferAsync().ConfigureAwait(false) == 0) // 0 => client clean disconnect
{
break;
}
}
finally
{
UntrackSessionRead(session.Id);
}
int requestBytesParsed, responseBytesWritten;
HttpRequest request;
while (continueSession && session.TryParseNextRequestFromBuffer(out requestBytesParsed, out request))
{
Router.HandleResult result = await router.HandleRequest(request, DateTime.UtcNow).ConfigureAwait(false);
HttpResponse response = result.HttpResponse;
var webSocketUpgradeResponse = response as WebSocketUpgradeResponse;
if (webSocketUpgradeResponse == null)
{
responseBytesWritten = session.WriteResponse(response, request.IsKeepAlive);
continueSession = request.IsKeepAlive && session.KeepAlivesRemaining > 0;
}
else
{
var isUpgraded = HandleWebsocketUpgrade(session,
result.MatchedRouteTableIndex,
result.MatchedEndpointIndex,
webSocketUpgradeResponse,
out responseBytesWritten);
continueSession = false;
closeSessionOnReturn = !isUpgraded;
}
if (result.MatchedRouteTableIndex >= 0 && result.MatchedEndpointIndex >= 0)
{
router.Metrics.CountBytes(result.MatchedRouteTableIndex, result.MatchedEndpointIndex, requestBytesParsed, responseBytesWritten);
}
}
}
}
catch (RequestException e)
{
logger.Warn("Error parsing or bad request - {0}", e.Message);
}
catch (SessionStreamException)
{
// forced disconnect, socket errors
}
catch (Exception e)
{
//TODO: count session-fatal errors (not captured as route table 500s)
logger.Fatal("Internal server error handling session - {0}", e.ToString());
}
finally
{
UntrackSession(session.Id);
if (closeSessionOnReturn)
{
session.CloseQuiety();
}
}
}
async Task HandleSession(HttpSession session)
{
var closeSessionOnReturn = true;
try
{
var continueRequestLoop = true;
while (continueRequestLoop && !session.IsDisconnected()) // request loop
{
try
{
TrackSessionRead(session.Id);
if (await session.ReadToBufferAsync().ConfigureAwait(false) == 0) // 0 => client clean disconnect
{
break;
}
}
finally
{
UntrackSessionRead(session.Id);
}
int requestBytesParsed, responseBytesWritten;
HttpRequest request;
while (continueRequestLoop && session.TryParseNextRequestFromBuffer(out requestBytesParsed, out request))
{
Router.HandleResult result = await router.HandleRequest(request, DateTime.UtcNow).ConfigureAwait(false);
HttpResponse response = result.HttpResponse;
if (response is WebSocketUpgradeResponse)
{
continueRequestLoop = false;
var acceptUpgrade = response as WebSocketUpgradeResponse.AcceptUpgradeResponse;
if (acceptUpgrade == null)
{
var rejectUpgrade = (WebSocketUpgradeResponse.RejectUpgradeResponse)response;
responseBytesWritten = await rejectUpgrade.WriteToAsync(session.Stream, 0, sessionReadTimeout).ConfigureAwait(false);
}
else
{
responseBytesWritten = await AcceptWebSocketUpgrade(session, result.MatchedRouteTableIndex, result.MatchedEndpointIndex, acceptUpgrade).ConfigureAwait(false);
closeSessionOnReturn = false;
}
}
else
{
responseBytesWritten = await response.WriteToAsync(session.Stream, request.IsKeepAlive ? session.KeepAlivesRemaining : 0, sessionReadTimeout).ConfigureAwait(false);
continueRequestLoop = request.IsKeepAlive && session.KeepAlivesRemaining > 0;
}
if (result.MatchedRouteTableIndex >= 0 && result.MatchedEndpointIndex >= 0)
{
router.Metrics.CountBytes(result.MatchedRouteTableIndex, result.MatchedEndpointIndex, requestBytesParsed, responseBytesWritten);
}
}
}
}
catch (RequestException e)
{
sessionExceptionCounters.Count(e.GetType());
logger.Warn("Error parsing or bad request - {0}", e.Message);
}
catch (SessionStreamException e)
{
sessionExceptionCounters.Count(e.GetType());
}
catch (Exception e)
{
sessionExceptionCounters.Count(e.GetType());
logger.Fatal("Error handling session - {0}", e.ToString());
}
finally
{
UntrackSession(session.Id);
if (closeSessionOnReturn)
{
session.CloseQuiety();
}
}
}
