private bool ProcessRequest(IHttpRequest aRequest, IHttpResponse aResponse, IHttpSession aSession)
{
session.HandleSession(aRequest, aResponse);
IServerDispatcherStrategy serverDispatcher = ChooseStrategy(session);
int index = serverDispatcher.GetNextServer();
if (index == -1)
{
return(false);
}
Logger.WriteLine("Forwarding {0} {1} to server {2}.", aRequest.Method, aRequest.UriPath, _servers[index]);
HttpWebRequest request = PrepareServerRequest(aRequest, index);
try
{
HttpWebResponse response = (HttpWebResponse)request.GetResponse();
PrepareClientResponse(aResponse, response);
SetResponseCookies(response, aResponse, index, aRequest.Uri.Host);
HandleResponse(response, aResponse, aRequest, _servers[index]);
}
catch (WebException e) when(e.Status == WebExceptionStatus.Timeout)
{
_servers.RemoveAt(index);
}
catch (WebException exception)
{
if (exception.Response != null)
{
HttpWebResponse response = (HttpWebResponse)exception.Response;
PrepareClientResponse(aResponse, response);
SetResponseCookies(response, aResponse, index, aRequest.Uri.Host);
HandleResponse(response, aResponse, aRequest, _servers[index]);
}
else
{
aResponse.Status = HttpStatusCode.InternalServerError;
StreamWriter writer = new StreamWriter(aResponse.Body);
writer.Write(exception.Message);
writer.Flush();
}
}
catch (Exception ex)
{
Logger.WriteLine("Exception! - {0}: {1}", ex.GetType().Name, ex.Message);
aResponse.Status = HttpStatusCode.InternalServerError;
StreamWriter writer = new StreamWriter(aResponse.Body);
writer.Write($"{ex.GetType().Name}: {ex.Message}");
writer.Flush();
}
return(true);
}
private IServerDispatcherStrategy ChooseStrategy(Session aSession)
{
IServerDispatcherStrategy roundrobin = RoundrobinStrategy.GetInstance(_servers);
switch (this.Settings["Algorithm"])
{
case "roundrobin": return(roundrobin);
case "sameserver": return(new SameServerStrategy(roundrobin, aSession));
default: return(roundrobin);
}
}
public SameServerStrategy(IServerDispatcherStrategy newClientStrategy, Session aSession)
{
_newClientStrategy = newClientStrategy;
_session = aSession;
}
