/// <summary>
/// Downloads a webpage from a blog and searches for TEMPORARY_POST_TITLE_GUID.
/// </summary>
/// <param name="blogPageUrl"></param>
/// <param name="progress"></param>
/// <returns>Stream containing document which contains TEMPORARY_POST_TITLE_GUID.</returns>
private Stream DownloadBlogPage(string blogPageUrl, IProgressHost progress)
{
ProgressTick tick = new ProgressTick(progress, 50, 100);
MemoryStream memStream = new MemoryStream();
IHTMLDocument2 doc2 = null;
// WinLive 221984: Theme detection timing out intermittently on WordPress.com
// The temp post *often* takes more than a minute to show up on the blog home page.
// The download progress dialog has a cancel button, we'll try a lot before giving up.
for (int i = 0; i < 30 && doc2 == null; i++)
{
if (progress.CancelRequested)
{
throw new OperationCancelledException();
}
tick.UpdateProgress(0, 0, Res.Get(StringId.ProgressDownloadingWeblogEditingStyle));
// Sleep to give the post enough time to show up.
// We'll make 10 attempts with a 1 second delay.
// Subsequent attempts will use a 10 second delay.
// This means we'll try for 5 minutes (10s + 290s = 300s) before we consider the operation timed out.
Thread.Sleep(i < 10 ? 1000 : 10000);
// Add random parameter to URL to bypass cache
var urlRandom = UrlHelper.AppendQueryParameters(blogPageUrl, new string[] { Guid.NewGuid().ToString() });
HttpWebResponse resp = _pageDownloader(urlRandom, 60000);
memStream = new MemoryStream();
using (Stream respStream = resp.GetResponseStream())
StreamHelper.Transfer(respStream, memStream);
//read in the HTML file and determine if it contains the title element
memStream.Seek(0, SeekOrigin.Begin);
doc2 = HTMLDocumentHelper.GetHTMLDocumentFromStream(memStream, urlRandom);
if (HTMLDocumentHelper.FindElementContainingText(doc2, TEMPORARY_POST_TITLE_GUID) == null)
{
doc2 = null;
}
}
if (doc2 == null)
{
throw new OperationTimedOutException();
}
tick.UpdateProgress(100, 100);
//return the stream
memStream.Seek(0, SeekOrigin.Begin);
return(memStream);
}