public void Scrape()
{
using (var db = new NishkriyaContext())
{
var session = new ScraperSession { Start = DateTime.Now };
db.Accounts.Where(a => a.Active).ToList().ForEach(account =>
{
var toAdd = GetNewPosts(account, db.Threads.ToList(), session).ToList();
session.PostsAdded += toAdd.Count;
account.Posts.AddRange(toAdd);
db.SaveChanges(); //Pesky thread duplication avoided
});
session.Finish = DateTime.Now;
db.Stats.Add(session);
db.SaveChanges();
}
}
private IEnumerable<Post> GetNewPosts(ForumAccount account, List<Thread> threads, ScraperSession session)
{
try
{
var url = string.Format(Settings.Default.ProfileUrl, account.ForumId);
var req = (HttpWebRequest)WebRequest.Create(url);
req.Method = "GET";
req.ContentType = "application/x-www-form-urlencoded";
req.UserAgent = "Mozilla/5.0 (Windows NT 6.1) AppleWebKit/535.2 (KHTML, like Gecko) Chrome/15.0.874.121 Safari/535.2";
req.CookieContainer = new CookieContainer();
req.CookieContainer.Add(new Cookie(".YAFNET_Authentication", Settings.Default.AuthToken, "/", "forums.white-wolf.com"));
var responseStream = req.GetResponse().GetResponseStream();
var document = new HtmlDocument();
if (responseStream == null)
{
throw new NoNullAllowedException();
}
using (var reader = new StreamReader(responseStream))
{
using (var memoryStream = new MemoryStream())
{
using (var writer = new StreamWriter(memoryStream))
{
writer.Write(reader.ReadToEnd());
memoryStream.Position = 0;
document.Load(memoryStream, new UTF8Encoding());
}
}
}
document = CleanHtml(document);
var postsCollection = new List<Post>();
const string placeholderFragment = "id('MasterPageContentPlaceHolder_forum_ctl01_ProfileTabs_Last10PostsTab')//table//tr[";
const string anchorSelectorFragment = "]//td/a/@href";
const string titleSelectorFragment = "]//td/a/text()";
const string dateSelectorFragment = "]//td/text()[4]";
foreach (int i in Enumerable.Range(0, 10))
{
var tableRow = 1 + (2 * i);
var threadIdSelector = String.Format("{0}{1}{2}", placeholderFragment, tableRow, anchorSelectorFragment);
var titleSelector = String.Format("{0}{1}{2}", placeholderFragment, tableRow, titleSelectorFragment);
var dateSelector = String.Format("{0}{1}{2}", placeholderFragment, tableRow, dateSelectorFragment);
var threadHref = document.DocumentNode.SelectSingleNode(threadIdSelector).Attributes[0].Value;
var threadId = int.Parse(Regex.Match(threadHref, @"(\d+)$").Groups[0].Value);
var threadTitle = document.DocumentNode.SelectSingleNode(titleSelector).InnerHtml.Trim();
var postDate = DateTime.Parse(document.DocumentNode.SelectSingleNode(dateSelector).InnerHtml.Trim());
var postContent =
document.DocumentNode.SelectSingleNode(
"id('MasterPageContentPlaceHolder_forum_ctl01_ProfileTabs_Last10PostsTab_LastPosts_MessagePost_" + i + "')").InnerHtml;
Thread thread = threads.SingleOrDefault(s => s.ThreadId == threadId);
if (thread == null)
{
thread = new Thread { ThreadId = threadId, Title = threadTitle };
threads.Add(thread);
session.ThreadsAdded++;
}
postsCollection.Add(new Post
{
Content = postContent,
Hash = _hashProvider.Compute(postContent),
PostDate = postDate,
Thread = thread
});
}
return postsCollection.Where(newPost => !account.Posts.Select(p => p.Hash).Contains(newPost.Hash));
}
catch (Exception ex)
{
session.HadErrors = true;
session.Errors.Add(new Error
{
Message = ex.Message,
Source = ex.Source,
StackTrace = ex.StackTrace,
TargetSite = ex.TargetSite.Name
});
Debug.WriteLine(ex.Message + "\n----\n" + ex.StackTrace);
return new Post[0];
}
}
