private static void saveCrawlInDatabase(crawlingResult crawledResult)
{
lock (_lockDatabaseAdd)
{
using (var context = new DBCrawling())
{
crawledResult.UrlHash = crawledResult.Url.ComputeHashOfOurSystem();
crawledResult.HostUrl = crawledResult.Url.returnRootUrl();
var vrResult = context.tblMainUrls.SingleOrDefault(b => b.UrlHash == crawledResult.UrlHash);
crawledResult.ParentUrlHash = crawledResult.ParentUrlHash.ComputeHashOfOurSystem();
if (crawledResult.blcrawlSuccess == true)
{
crawledResult.IsCrawled = true;
if (!string.IsNullOrEmpty(crawledResult.SourceCode))
{
double dblOriginalSourceCodeLenght = crawledResult.SourceCode.Length;
crawledResult.SourceCode = crawledResult.SourceCode.CompressString();
crawledResult.CompressionPercent = Convert.ToByte(
Math.Floor(
((crawledResult.SourceCode.Length.ToDouble() / dblOriginalSourceCodeLenght) * 100))
);
}
crawledResult.CrawlTryCounter = 0;
}
tblMainUrl finalObject = crawledResult.converToBaseMainUrlClass();
//this approach brings extra overhead to the server with deleting from server first
//therefore will use copy properties of object to another object without changing reference
//if (vrResult != null)
//{
// context.tblMainUrls.Remove(vrResult);
// context.SaveChanges();
//}
if (vrResult != null)
{
finalObject.DiscoverDate = vrResult.DiscoverDate;
finalObject.LinkDepthLevel = vrResult.LinkDepthLevel;
finalObject.CrawlTryCounter = vrResult.CrawlTryCounter;
if (crawledResult.blcrawlSuccess == false)
{
finalObject.CrawlTryCounter++;
}
finalObject.CopyProperties(vrResult);
}
else
{
context.tblMainUrls.Add(finalObject);
}
var gg = context.SaveChanges();
}
}
}
public static void clearDatabase()
{
using (var context = new DBCrawling())
{
var ctx = ((System.Data.Entity.Infrastructure.IObjectContextAdapter)context).ObjectContext;
ctx.ExecuteStoreCommand("truncate table tblMainUrls");
}
}
private void btnTest_Click(object sender, RoutedEventArgs e)
{
using (DBCrawling db = new DBCrawling())
{
db.tblMainUrls.RemoveRange(db.tblMainUrls);
db.SaveChanges();
db.tblMainUrls.Add(new tblMainUrl {
Url = "www.toros.edu.tr", ParentUrlHash = "www.toros.edu.tr", SourceCode = "gg", UrlHash = "ww"
});
db.SaveChanges();
}
}
private static void saveCrawlInDatabase(crawlingResult crawledResult)
{
if (crawledResult.blcrawlSuccess == false)
{
return;
}
using (var context = new DBCrawling())
{
tblMainUrl crawledUrl = new tblMainUrl();
crawledUrl.UrlHash = crawledResult.srCrawledUrl.normalizeUrl().ComputeSha256Hash();
var vrResult = context.tblMainUrls.SingleOrDefault(b => b.UrlHash == crawledUrl.UrlHash);
if (vrResult == null)
{
context.tblMainUrls.Add(crawledUrl);
}
else
{
crawledUrl = vrResult;
context.tblMainUrls.Attach(crawledUrl);
context.Entry(crawledUrl).State = EntityState.Modified;
}
crawledUrl.DiscoverDate = crawledResult.dtDiscoverDate;
crawledUrl.FetchTimeMS = crawledResult.irCrawlingTimeMS;
crawledUrl.LastCrawlingDate = crawledResult.dtLastCrawlingDate;
crawledUrl.LinkDepthLevel = crawledResult.irLinkDepthLevel;
crawledUrl.PageTile = crawledResult.srTitleofPage;
crawledUrl.ParentUrlHash = crawledResult.srParentUrlHash.normalizeUrl().ComputeSha256Hash();
crawledUrl.SourceCode = crawledResult.srCrawledSourceCode.CompressString();
crawledUrl.CompressionPercent = Convert.ToByte(
Math.Floor(
((crawledUrl.SourceCode.Length.ToDouble() / crawledResult.srCrawledSourceCode.Length.ToDouble()) * 100))
);
crawledUrl.Url = crawledResult.srCrawledUrl;
var gg = context.SaveChanges();
}
}
private static void saveDiscoveredLinksInDatabaseForFutureCrawling(crawlingResult crawlResult)
{
lock (_lockDatabaseAdd)
{
using (var context = new DBCrawling())
{
HashSet <string> hsProcessedUrls = new HashSet <string>();
foreach (var vrPerLink in crawlResult.lstDiscoveredLinks)
{
var vrHashedLink = vrPerLink.ComputeHashOfOurSystem();
if (hsProcessedUrls.Contains(vrHashedLink))
{
continue;
}
var vrResult = context.tblMainUrls.Any(databaseRecord => databaseRecord.UrlHash == vrHashedLink);
if (vrResult == false)
{
crawlingResult newLinkCrawlingResult = new crawlingResult();
newLinkCrawlingResult.Url = vrPerLink.normalizeUrl();
newLinkCrawlingResult.HostUrl = newLinkCrawlingResult.Url.returnRootUrl();
newLinkCrawlingResult.UrlHash = vrPerLink.ComputeHashOfOurSystem();
newLinkCrawlingResult.ParentUrlHash = crawlResult.UrlHash;
newLinkCrawlingResult.LinkDepthLevel = (short)(crawlResult.LinkDepthLevel + 1);
context.tblMainUrls.Add(newLinkCrawlingResult.converToBaseMainUrlClass());
hsProcessedUrls.Add(vrHashedLink);
Interlocked.Increment(ref irDiscoveredUrlCount);
}
}
context.SaveChanges();
}
}
}
private void startPollingAwaitingURLs(object sender, EventArgs e)
{
lock (UserLogs)
{
string srPerMinCrawlingspeed = (irCrawledUrlCount.ToDouble() / (DateTime.Now - dtStartDate).TotalMinutes).ToString("N2");
string srPerMinDiscoveredLinkSpeed = (irDiscoveredUrlCount.ToDouble() / (DateTime.Now - dtStartDate).TotalMinutes).ToString("N2");
string srPassedTime = (DateTime.Now - dtStartDate).TotalMinutes.ToString("N2");
UserLogs.Insert(0, $"{DateTime.Now} polling awaiting urls \t processing: {blBeingProcessed} \t number of crawling tasks: {lstCrawlingTasks.Count}");
UserLogs.Insert(0, $"Total Time: {srPassedTime} Minutes \t Total Crawled Links Count: {irCrawledUrlCount.ToString("N0")} \t Crawling Speed Per Minute: {srPerMinCrawlingspeed} \t Total Discovered Links : {irDiscoveredUrlCount.ToString("N0")} \t Discovered Url Speed: {srPerMinDiscoveredLinkSpeed} ");
}
logMesssage($"polling awaiting urls \t processing: {blBeingProcessed} \t number of crawling tasks: {lstCrawlingTasks.Count}");
if (blBeingProcessed)
{
return;
}
lock (_lock_CrawlingSync)
{
blBeingProcessed = true;
lstCrawlingTasks = lstCrawlingTasks.Where(pr => pr.Status != TaskStatus.RanToCompletion && pr.Status != TaskStatus.Faulted).ToList();
int irTasksCountToStart = _irNumberOfTotalConcurrentCrawling - lstCrawlingTasks.Count;
if (irTasksCountToStart > 0)
{
using (DBCrawling db = new DBCrawling())
{
var vrReturnedList = db.tblMainUrls.Where(x => x.IsCrawled == false && x.CrawlTryCounter < _irMaximumTryCount)
.OrderBy(pr => pr.DiscoverDate)
.Select(x => new
{
x.Url,
x.LinkDepthLevel
}).Take(irTasksCountToStart * 2).ToList();
logMesssage(string.Join(" , ", vrReturnedList.Select(pr => pr.Url)));
foreach (var vrPerReturned in vrReturnedList)
{
var vrUrlToCrawl = vrPerReturned.Url;
int irDepth = vrPerReturned.LinkDepthLevel;
lock (lstCurrentlyCrawlingUrls)
{
if (lstCurrentlyCrawlingUrls.Contains(vrUrlToCrawl))
{
logMesssage($"bypass url since already crawling: \t {vrUrlToCrawl}");
continue;
}
lstCurrentlyCrawlingUrls.Add(vrUrlToCrawl);
}
logMesssage($"starting crawling url: \t {vrUrlToCrawl}");
lock (UserLogs)
{
UserLogs.Insert(0, $"{DateTime.Now} starting crawling url: \t {vrUrlToCrawl}");
}
var vrStartedTask = Task.Factory.StartNew(() => { crawlPage(vrUrlToCrawl, irDepth, null, DateTime.MinValue); }).ContinueWith((pr) =>
{
lock (lstCurrentlyCrawlingUrls)
{
lstCurrentlyCrawlingUrls.Remove(vrUrlToCrawl);
logMesssage($"removing url from list since task completed: \t {vrUrlToCrawl}");
}
});
lstCrawlingTasks.Add(vrStartedTask);
if (lstCrawlingTasks.Count > _irNumberOfTotalConcurrentCrawling)
{
break;
}
}
}
}
blBeingProcessed = false;
}
}
