public void BuildFeedQueue(string IP, DataAccessDataContext DataContext)
{
try
{
foreach (var item in DataContext.GetFeedList(IP).OrderBy(x => x.Timestamp))
{
FeedQueues[IP].AddLast(new Tuple <CLSiteSection, CLCity, int, DateTime, CLSubCity>(SiteSections[IP].First(x => x.Name == item.SiteSection), Cities[IP].First(x => x.Name == item.City), 0, item.Timestamp, SubCities[IP].FirstOrDefault(x => x.SubCity == item.SubCity)));
}
}
catch (Exception ex)
{
if (ex.Message.Contains("Rerun the transaction") || ex.Message.Contains("Rerun the transaction"))
{
lock (EventLogKey)
{
EventLog.WriteEntry("An error occurred while attempting to retrieve database records.\n\n" + PrintException(ex), EventLogEntryType.Warning);
}
BuildFeedQueue(IP, DataContext);
}
else
{
lock (EventLogKey)
{
EventLog.WriteEntry("An error occurred while attempting to retrieve database records.\n\n" + PrintException(ex), EventLogEntryType.Error);
}
}
}
}
public void FetchNextWhatchamacallit(string IP, IWebProxy proxy, DataAccessDataContext DataContext)
{
Queue <Listing> ListingQueue = ListingQueues[IP];
lock (KeyChain[IP])
{
if (ListingQueue.Count > 0)
{
HttpWebRequest hwr = (HttpWebRequest)WebRequest.Create("http://" + ListingQueue.Peek().CLCity.Name + ".craigslist.org/" + (ListingQueue.Peek().CLSubCity == null ? "" : (ListingQueue.Peek().CLSubCity.SubCity + "/")) + ListingQueue.Peek().CLSiteSection.Name + "/" + ListingQueue.Peek().Id.ToString() + ".html");
{
hwr.Proxy = proxy;
hwr.AutomaticDecompression = DecompressionMethods.GZip | DecompressionMethods.Deflate;
hwr.Headers.Add(HttpRequestHeader.AcceptEncoding, "gzip, deflate");
hwr.KeepAlive = false;
hwr.UserAgent = Properties.Settings.Default.UserAgent;
AsyncRequestStruct ars = new AsyncRequestStruct()
{
request = hwr, parameters = ListingQueue.Peek(), IP = IP, proxy = proxy, DataContext = DataContext
};
ars.stopwatch = new Stopwatch();
ars.stopwatch.Start();
hwr.BeginGetResponse(new AsyncCallback(ParseListingInfo), ars);
}
ProcessingListings[IP].Add(ListingQueue.Dequeue());
}
else
{
if (FeedQueues[IP].Count == 0)
{
BuildFeedQueue(IP, DataContext);
}
var selectedItem = FeedQueues[IP].First.Value;
FeedQueues[IP].RemoveFirst();
HttpWebRequest hwr = (HttpWebRequest)WebRequest.Create("http://" + selectedItem.Item2.Name + ".craigslist.org/search/" + (selectedItem.Item5 == null ? "" : (selectedItem.Item5.SubCity + "/")) + selectedItem.Item1.Name + "?s=" + selectedItem.Item3.ToString());
{
hwr.Proxy = proxy;
hwr.AutomaticDecompression = DecompressionMethods.GZip | DecompressionMethods.Deflate;
hwr.Headers.Add(HttpRequestHeader.AcceptEncoding, "gzip, deflate");
hwr.KeepAlive = false;
hwr.UserAgent = Properties.Settings.Default.UserAgent;
AsyncRequestStruct ars = new AsyncRequestStruct()
{
request = hwr, parameters = selectedItem, IP = IP, proxy = proxy, DataContext = DataContext
};
ars.stopwatch = new Stopwatch();
ars.stopwatch.Start();
hwr.BeginGetResponse(new AsyncCallback(ParseFeed), ars);
}
}
}
}
private void SubmitData(DataAccessDataContext DataContext)
{
try
{
lock (MasterKey)
{
if (DataContext.GetChangeSet().Inserts.OfType <Listing>().Count() >= Properties.Settings.Default.MinSubmissionBundleSize)
{
DataContext.SubmitChanges();
}
}
}
catch (Exception ex)
{
StringBuilder debugmsg = new StringBuilder();
var DuplicateListings = DataContext.Listings.GroupBy(x => x.Id).Where(x => x.Count() > 1).Select(x => x.Key).ToArray();
var DuplicateAttributes = DataContext.ListingAttributes.GroupBy(x => x.AttributeID).Where(x => x.Count() > 1).Select(x => x.Key).ToArray();
debugmsg.AppendLine("Duplicate Listings:");
foreach (long listingid in DuplicateListings)
{
debugmsg.AppendLine("[" + listingid + "]");
}
debugmsg.AppendLine("Duplicate Attributes:");
foreach (int attrid in DuplicateAttributes)
{
debugmsg.AppendLine("[" + attrid + "]");
}
debugmsg.AppendLine("Existing Listings:");
foreach (Listing li in DataContext.GetChangeSet().Inserts.OfType <Listing>())
{
if (DataContext.Listings.Any(x => x.Id == li.Id))
{
debugmsg.AppendLine("[" + li.Id + "]");
}
}
debugmsg.AppendLine("Existing Attributes:");
foreach (ListingAttribute li in DataContext.GetChangeSet().Inserts.OfType <ListingAttribute>())
{
if (DataContext.ListingAttributes.Any(x => x.AttributeID == li.AttributeID))
{
debugmsg.AppendLine("[" + li.AttributeID + "]");
}
}
string wholemessage = "Failed to submit new listings to database.\n\n" + ex.Message + "\n\n" + debugmsg.ToString();
wholemessage = wholemessage.Substring(0, Math.Min(short.MaxValue, wholemessage.Length));
lock (EventLogKey)
{
EventLog.WriteEntry(wholemessage, EventLogEntryType.Error);
}
}
}
public void init()
{
EventLog.Source = "Craigslist Crawler";
ServicePointManager.DefaultConnectionLimit = int.MaxValue;
ServicePointManager.Expect100Continue = false;
ServicePointManager.CheckCertificateRevocationList = false;
ConnectionCooldown = Properties.Settings.Default.ConnectionCooldown;
try
{
DataAccessDataContext dadc = new DataAccessDataContext();
if (Properties.Settings.Default.EnableConcurrentIPLimits)
{
IPs = dadc.CLCities.Where(x => x.Enabled).Select(x => x.IP).Distinct().ToArray();
}
else
{
IPs = new string[] { "0" }
};
var proxies = dadc.Proxies.Where(x => x.Enabled).ToArray();
foreach (string ip in IPs)
{
DataAccessDataContext datacontext = new DataAccessDataContext();
FeedQueues.Add(ip, new LinkedList <Tuple <CLSiteSection, CLCity, int, DateTime, CLSubCity> >());
ListingQueues.Add(ip, new Queue <Listing>());
ListingFailures.Add(ip, new Dictionary <Listing, int>());
ProcessingListings.Add(ip, new List <Listing>());
PreQueueListings.Add(ip, new List <Listing>());
if (Properties.Settings.Default.EnableConcurrentIPLimits)
{
Cities.Add(ip, datacontext.CLCities.Where(x => x.Enabled && x.IP == ip).ToArray());
CompletedListingIds.Add(ip, new HashSet <long>(datacontext.Listings.Where(x => x.CLCity.IP == ip).Select(x => x.Id)));
}
else
{
Cities.Add(ip, datacontext.CLCities.Where(x => x.Enabled).ToArray());
CompletedListingIds.Add(ip, new HashSet <long>(datacontext.Listings.Select(x => x.Id)));
}
SubCities.Add(ip, datacontext.CLSubCities.ToArray());
SiteSections.Add(ip, datacontext.CLSiteSections.Where(x => x.Enabled).ToArray());
KeyChain.Add(ip, new object());
BuildFeedQueue(ip, datacontext);
if (proxies.Length > 0)
{
foreach (Proxy prox in proxies)
{
FetchNextWhatchamacallit(ip, new WebProxy(prox.IP, prox.Port), datacontext);
}
}
else
{
FetchNextWhatchamacallit(ip, null, datacontext);
}
}
}
catch (Exception ex)
{
lock (EventLogKey)
{
EventLog.WriteEntry("An error occurred while attempting to retrieve database records.\n\n" + ex.Message, EventLogEntryType.Error);
}
return;
}
lock (EventLogKey)
{
EventLog.WriteEntry("Initialization Success!");
}
}
