/// <summary>
/// Requests the remote HTML.
/// </summary>
/// <param name="cacheProvider">Strategy for caching the remote HTML.</param>
/// <param name="selectedSection">The selected section.</param>
private void RequestRemoteHtml(RemoteMasterPageCacheProviderBase cacheProvider, string selectedSection)
{
try
{
// Get the URL to request the cached control from.
// Include text size so that header knows which links to apply
var textSize = new TextSize(HttpContext.Current.Request.Cookies, HttpContext.Current.Request.QueryString);
Uri urlToRequest = new Uri(HttpContext.Current.Request.Url, String.Format(CultureInfo.CurrentCulture, config["MasterPageControlUrl"], this.Control));
var applicationPath = HttpUtility.UrlEncode(HttpRuntime.AppDomainAppVirtualPath.ToLower(CultureInfo.CurrentCulture).TrimEnd('/'));
var query = HttpUtility.ParseQueryString(urlToRequest.Query);
query.Add("section", selectedSection);
query.Add("host", Page.Request.Url.Host);
query.Add("textsize", textSize.CurrentTextSize().ToString(CultureInfo.InvariantCulture));
query.Add("path", applicationPath);
urlToRequest = new Uri(urlToRequest.Scheme + "://" + urlToRequest.Authority + urlToRequest.AbsolutePath + "?" + query);
// Create the request. Pass current user-agent so that library catalogue PCs can be detected by the remote script.
var webRequest = (HttpWebRequest)WebRequest.Create(urlToRequest);
webRequest.UseDefaultCredentials = true;
webRequest.UserAgent = Page.Request.UserAgent;
webRequest.Proxy = new ConfigurationProxyProvider().CreateProxy();
webRequest.Timeout = 4000;
if (!String.IsNullOrEmpty(this.config["Timeout"]))
{
int timeout;
if (Int32.TryParse(this.config["Timeout"], out timeout))
{
webRequest.Timeout = timeout;
}
}
#if DEBUG
// Turn off SSL check in debug mode as it will always fail against a self-signed certificate used for development
webRequest.ServerCertificateValidationCallback += (sender, certificate, chain, sslPolicyErrors) => true;
#endif
// Prepare the information we'll need when the response comes back
var state = new RequestState();
state.Request = webRequest;
state.CacheProvider = cacheProvider;
// Kick off the request and, only if there's nothing already cached which we can use, wait for it to come back
if (cacheProvider.SupportsAsync)
{
RequestRemoteHtmlAsynchronous(cacheProvider, webRequest, state);
}
else
{
RequestRemoteHtmlSynchronous(cacheProvider, webRequest);
}
}
catch (UriFormatException ex)
{
throw new ConfigurationErrorsException(String.Format(CultureInfo.CurrentCulture, config["MasterPageControlUrl"], this.Control) + " is not a valid absolute URL", ex);
}
}
private static void RequestRemoteHtmlSynchronous(RemoteMasterPageCacheProviderBase cacheProvider, HttpWebRequest webRequest)
{
try
{
using (var response = webRequest.GetResponse())
{
using (var responseStream = response.GetResponseStream())
{
cacheProvider.SaveRemoteHtmlToCache(responseStream);
}
}
}
catch (WebException ex)
{
// Publish exception, otherwise it just disappears as async method has no calling code to throw to.
ex.Data.Add("URL which failed", webRequest.RequestUri);
ex.ToExceptionless().Submit();
}
}
private void RequestRemoteHtmlAsynchronous(RemoteMasterPageCacheProviderBase cacheProvider, HttpWebRequest webRequest, RequestState state)
{
// Only wait for the response if there's nothing there at all.
// If there is a cached version use that, but set the update running in the background.
if (!cacheProvider.CachedVersionExists)
{
if (waitFor == null)
{
waitFor = new Dictionary <string, ManualResetEvent>();
}
waitFor[this.Control] = new ManualResetEvent(false);
state.WaitForResponse = waitFor[this.Control];
}
webRequest.BeginGetResponse(new AsyncCallback(Response_Callback), state);
if (!cacheProvider.CachedVersionExists)
{
waitFor[this.Control].WaitOne(new TimeSpan(0, 0, 10));
}
}
