partial void DeleteCLCity(CLCity instance);
partial void InsertCLCity(CLCity instance);
partial void UpdateCLCity(CLCity instance);
private void ParseFeed(IAsyncResult AsyncResult)
{
bool banned403 = false;
Stopwatch sw = new Stopwatch();
sw.Start();
AsyncRequestStruct ars = (AsyncRequestStruct)AsyncResult.AsyncState;
try
{
ars.stopwatch.Stop();
parseFeedConnectionCount++;
parseFeedConnectionTime += ars.stopwatch.Elapsed;
Tuple <CLSiteSection, CLCity, int, DateTime, CLSubCity> feedResource = (Tuple <CLSiteSection, CLCity, int, DateTime, CLSubCity>)ars.parameters;
CLSiteSection SiteSection = feedResource.Item1;
CLCity City = feedResource.Item2;
int depth = feedResource.Item3;
DateTime lastStamp = feedResource.Item4;
CLSubCity subCity = feedResource.Item5;
HtmlDocument response = new HtmlDocument();
try
{
using (WebResponse wr = ars.request.EndGetResponse(AsyncResult))
{
using (Stream stream = wr.GetResponseStream())
{
using (StreamReader sr = new StreamReader(stream))
{
response.LoadHtml(sr.ReadToEnd());
}
}
}
}
catch (Exception ex)
{
if (ex.Message.Contains("(403)")) //If a 403 occurs, remove the proxy from operation.
{
if (Properties.Settings.Default.DisabledBannedProxies)
{
WebProxy wp = (WebProxy)ars.request.Proxy;
Proxy selectedProxy = ars.DataContext.Proxies.FirstOrDefault(x => x.IP == wp.Address.Host && x.Port == wp.Address.Port);
if (selectedProxy != null)
{
selectedProxy.Enabled = false;
lock (KeyChain[ars.IP])
{
lock (MasterKey)
{
ars.DataContext.SubmitChanges();
}
}
}
}
banned403 = true;
return;
}
lock (EventLogKey)
{
EventLog.WriteEntry("An error has occurred while retreiving a feed:\n\n" + ex.Message + "\n\n" + (ex.InnerException == null ? "" : ex.InnerException.Message)
+ "\n\n" + SiteSection.Name + "\n" + City.Name + "\n" + depth.ToString(), EventLogEntryType.Warning);
}
return;
}
HtmlNodeCollection rows = response.DocumentNode.SelectNodes("//p[@class='row' and @data-pid]");
if (rows == null)
{
//The eventlog below is not necessarily true. It's possible that the end of the feeds has been reached and there are no more listings.
//EventLog.WriteEntry("Error while parsing feed. No connection errors thrown, but no results returned either.\n" + SiteSection.Name + "\n" + City.Name + "\n" + (subCity==null?"":("\n"+subCity.SubCity)) + "\n" + depth.ToString());
return;
}
bool NoUpdateTimesPosted = false;
foreach (HtmlNode row in rows)
{
if (row.SelectSingleNode("a").Attributes["href"].Value.Contains("craigslist."))
{ //This condition deals with "Nearby Areas". Links within the locale are relative -> /<sectionCode>/<Id>.html, whereas out of the locale are global -> http://<city.Name>/craigslist.org/<sectionCode>/<Id>.html
return;
}
Listing listingSource = new Listing()
{
CLSiteSection = SiteSection, CLCity = City, CLSubCity = subCity, Timestamp = DateTime.Now
};
//LASTUPDATED
try
{
HtmlNode hn = row.SelectSingleNode("span[@class='txt']/span[@class='pl']/time");
if (hn != null && DateTime.Parse(hn.Attributes["datetime"].Value) <= lastStamp)
{
return;
}
else if (hn == null)
{
NoUpdateTimesPosted = true;
}
}
catch (Exception ex)
{
lock (EventLogKey)
{
EventLog.WriteEntry("Failure to parse listing update time.\n\n" + PrintException(ex) + PrintListing(listingSource), EventLogEntryType.Error);
}
return;
}
//ID
try
{
listingSource.Id = long.Parse(row.Attributes["data-pid"].Value);
}
catch (Exception ex)
{
lock (EventLogKey)
{
EventLog.WriteEntry("Listing has an invalid ID:\n\n" + PrintException(ex) + PrintListing(listingSource), EventLogEntryType.Warning);
}
continue;
}
lock (KeyChain[ars.IP])
{
if (CompletedListingIds[ars.IP].Contains(listingSource.Id) ||
ListingQueues[ars.IP].Any(x => x.Id == listingSource.Id) ||
ProcessingListings[ars.IP].Any(x => x.Id == listingSource.Id) ||
PreQueueListings[ars.IP].Any(x => x.Id == listingSource.Id)
)
{
continue;
}
PreQueueListings[ars.IP].Add(listingSource);
}
//PRICE
{
HtmlNode hn = row.SelectSingleNode("span[@class='txt']/span[@class='l2']/span[@class='price']");
if (hn != null)
{
try
{
string value = long.Parse(hn.InnerText.Replace("$", "").Replace(@"$", "")).ToString();
listingSource.ListingAttributes.Add(
new ListingAttribute()
{
Name = "price",
Value = value
}
);
}
catch (Exception ex)
{
lock (EventLogKey)
{
EventLog.WriteEntry("Error parsing price listing data: " + hn.InnerText.Replace("$", "").Replace(@"$", "") + "\n\n" + PrintException(ex) + PrintListing(listingSource), EventLogEntryType.Warning);
}
}
}
}
//LOCALE
{
HtmlNode hn = row.SelectSingleNode("span[@class='txt']/span[@class='l2']/span[@class='pnr']/small");
if (hn != null)
{
try
{
listingSource.ListingAttributes.Add(new ListingAttribute()
{
Name = "Locale", Value = hn.InnerText.Replace("(", "").Replace(")", "").Trim()
});
}
catch (Exception ex)
{
lock (EventLogKey)
{
EventLog.WriteEntry("Error parsing listing locale data: " + hn.InnerText.Replace("(", "").Replace(")", "").Trim() + "\n\n" + PrintException(ex) + PrintListing(listingSource), EventLogEntryType.Warning);
}
}
}
}
//HAS PICTURE, HAS MAP
try
{
HtmlNode hn = row.SelectSingleNode("span[@class='txt']/span[@class='l2']/span[@class='pnr']/span[@class='px']/span[@class='p']");
if (hn != null)
{
if (hn.InnerText.Contains("pic"))
{
listingSource.ListingAttributes.Add(new ListingAttribute()
{
Name = "Has Picture", Value = "True"
});
}
if (hn.InnerText.Contains("map"))
{
listingSource.ListingAttributes.Add(new ListingAttribute()
{
Name = "Has Map", Value = "True"
});
}
}
}
catch (Exception ex)
{
lock (EventLogKey)
{
EventLog.WriteEntry("Error while parsing pic and map presence:\n" + PrintException(ex) + PrintListing(listingSource), EventLogEntryType.Warning);
}
}
//TITLE
try
{
listingSource.Title = row.SelectSingleNode("span[@class='txt']/span[@class='pl']/a[@class='hdrlnk']").InnerText;
}
catch (Exception ex)
{
lock (EventLogKey)
{
EventLog.WriteEntry("Listing skipped. Error parsing title from listing.\n\n" + PrintException(ex) + PrintListing(listingSource), EventLogEntryType.Warning);
}
lock (KeyChain[ars.IP])
{
PreQueueListings[ars.IP].Remove(listingSource);
}
continue;
}
lock (KeyChain[ars.IP])
{
ListingQueues[ars.IP].Enqueue(listingSource);
ProcessingListings[ars.IP].Remove(listingSource);
PreQueueListings[ars.IP].Remove(listingSource);
}
}
//If the for loop completes without a return, the next page needs to be looked at
if (NoUpdateTimesPosted == false)
{
lock (KeyChain[ars.IP])
{
FeedQueues[ars.IP].AddFirst(new Tuple <CLSiteSection, CLCity, int, DateTime, CLSubCity>(feedResource.Item1, feedResource.Item2, feedResource.Item3 + 100, feedResource.Item4, feedResource.Item5));
}
}
}
catch (Exception ex)
{
lock (EventLogKey)
{
EventLog.WriteEntry("An error has occurred while parsing the feed:\n\n" + PrintException(ex), EventLogEntryType.Error);
}
}
finally
{
sw.Stop();
parseFeedProcessingTime += sw.Elapsed;
parseFeedProcessingCount++;
if (ConnectionCooldown > 0 && sw.Elapsed < TimeSpan.FromMilliseconds(ConnectionCooldown))
{
Thread.Sleep(TimeSpan.FromMilliseconds(ConnectionCooldown) - sw.Elapsed);
}
try
{
if (banned403 == false)
{
FetchNextWhatchamacallit(ars.IP, ars.proxy, ars.DataContext);
}
}
catch (Exception ex)
{
lock (EventLogKey)
{
EventLog.WriteEntry("Error fetching requests from next queue.\n\n" + PrintException(ex));
}
}
}
}