/// <summary>Establishes the target route.</summary>
/// <remarks>Establishes the target route.</remarks>
/// <exception cref="Apache.Http.HttpException"></exception>
/// <exception cref="System.IO.IOException"></exception>
internal virtual void EstablishRoute(AuthState proxyAuthState, HttpClientConnection
managedConn, HttpRoute route, IHttpRequest request, HttpClientContext context)
{
RequestConfig config = context.GetRequestConfig();
int timeout = config.GetConnectTimeout();
RouteTracker tracker = new RouteTracker(route);
int step;
do
{
HttpRoute fact = tracker.ToRoute();
step = this.routeDirector.NextStep(route, fact);
switch (step)
{
case HttpRouteDirector.ConnectTarget:
{
this.connManager.Connect(managedConn, route, timeout > 0 ? timeout : 0, context);
tracker.ConnectTarget(route.IsSecure());
break;
}
case HttpRouteDirector.ConnectProxy:
{
this.connManager.Connect(managedConn, route, timeout > 0 ? timeout : 0, context);
HttpHost proxy = route.GetProxyHost();
tracker.ConnectProxy(proxy, false);
break;
}
case HttpRouteDirector.TunnelTarget:
{
bool secure = CreateTunnelToTarget(proxyAuthState, managedConn, route, request, context
);
this.log.Debug("Tunnel to target created.");
tracker.TunnelTarget(secure);
break;
}
case HttpRouteDirector.TunnelProxy:
{
// The most simple example for this case is a proxy chain
// of two proxies, where P1 must be tunnelled to P2.
// route: Source -> P1 -> P2 -> Target (3 hops)
// fact: Source -> P1 -> Target (2 hops)
int hop = fact.GetHopCount() - 1;
// the hop to establish
bool secure = CreateTunnelToProxy(route, hop, context);
this.log.Debug("Tunnel to proxy created.");
tracker.TunnelProxy(route.GetHopTarget(hop), secure);
break;
}
case HttpRouteDirector.LayerProtocol:
{
this.connManager.Upgrade(managedConn, route, context);
tracker.LayerProtocol(route.IsSecure());
break;
}
case HttpRouteDirector.Unreachable:
{
throw new HttpException("Unable to establish route: " + "planned = " + route + "; current = "
+ fact);
}
case HttpRouteDirector.Complete:
{
this.connManager.RouteComplete(managedConn, route, context);
break;
}
default:
{
throw new InvalidOperationException("Unknown step indicator " + step + " from RouteDirector."
);
}
}
}while (step > HttpRouteDirector.Complete);
}