private List <CrawlPlan> GetPagesToBrowserCrawl(string[] hosts)
{
var db = CrawlerContext.Create(_dbConStr);
Console.WriteLine("loading un-browser-crawled pages...");
List <CrawlPlan> pagesToCrawl;
pagesToCrawl = db.Uri.Where(o => o.CrawledAt.HasValue && !o.BrowserCrawledAt.HasValue && o.StatusCode == 200
&& (o.Scheme == "http" || o.Scheme == "https") &&
hosts.Contains(o.Host) &&
o.Fragment == ""
//&& o.Query == ""
&& !o.AbsoluteUri.Contains("c!") &&
!o.AbsoluteUri.Contains("i!") &&
!o.AbsoluteUri.Contains("a!") &&
!o.AbsoluteUri.Contains("p!")
&& !o.AbsoluteUri.EndsWith(".png") &&
!o.AbsoluteUri.EndsWith(".gif") &&
!o.AbsoluteUri.EndsWith(".jpg")
)
.OrderBy(o => o.Id)
.Select(o => new CrawlPlan()
{
AbsoluteUri = o.AbsoluteUri
})
.ToList();
return(pagesToCrawl);
}
//private readonly Dictionary<int, string> _dicUriPages = new Dictionary<int, string>();
public LightningCrawler(string dbConStr, string startPage, string[] hosts = null, int crawlerThreadCount = 20, int browserCrawlerThreadCount = 5, int browserLoadWait = 0)
{
_dbConStr = dbConStr;
_crawlerThreadCount = crawlerThreadCount;
_browserCrawlerThreadCount = browserCrawlerThreadCount;
_browserLoadWait = browserLoadWait;
_db = CrawlerContext.Create(dbConStr);
_startPageUri = new System.Uri(startPage);
_hosts = hosts ?? new string[] { _startPageUri.Host };
}
//private void SaveCrawlResult(CrawlResult crawlResult)
//{
// var stopWatch=new Stopwatch();
// stopWatch.Start();
// var page = _db.Uri.FirstOrDefault(o => o.AbsoluteUri == crawlResult.AbsoluteUri);
// if (page == null) Debugger.Break();
// if (page.FailedAt.HasValue)
// {
// page.FailedAt = crawlResult.FailedAt;
// page.FailedException = crawlResult.FailException;
// _db.SaveChanges();
// return;
// }
// if (crawlResult.StatusCode != 200)
// {
// if (crawlResult.LocationAbsoluteUri != null)
// {
// var destinationPage = _db.Uri.FirstOrDefault(o => o.AbsoluteUri == crawlResult.LocationAbsoluteUri);
// if (destinationPage == null)
// {
// //Console.WriteLine($"\tadding destination page to db...");
// destinationPage = NewUriDbModel(new System.Uri(crawlResult.LocationAbsoluteUri));
// _db.Uri.Add(destinationPage);
// _db.SaveChanges();
// }
// else
// {
// //Console.WriteLine($"\tdestination page already exists in db...");
// }
// //add redirect relations
// var redirectRelation = _db.RedirectRelation.FirstOrDefault(o => o.SourceId == page.Id && o.DestinationId == destinationPage.Id);
// if (redirectRelation == null)
// {
// //Console.WriteLine($"\tsaving redirect relation to db...");
// redirectRelation = new RedirectRelation()
// {
// SourceId = page.Id,
// DestinationId = destinationPage.Id,
// CreatedAt = DateTime.UtcNow,
// };
// _db.RedirectRelation.Add(redirectRelation);
// _db.SaveChanges();
// }
// else
// {
// //Console.WriteLine($"\tredirect relation already exists in db...");
// }
// }
// }
// if (crawlResult.Doc != null)
// {
// //find links
// var links = crawlResult.Doc.DocumentNode.SelectNodes("//a[@href]");
// //Console.WriteLine($"\tfound {links.Count} child links.");
// var linksToSave = new List<System.Uri>();
// foreach (var link in links)
// {
// var href = link.Attributes["href"].Value;
// //if(href.Contains("fortnite-stats/")) Debugger.Break();
// if (href == "" || href.StartsWith("javascript:"))
// continue;
// var decoded = HttpUtility.HtmlDecode(href);
// var childUri = Util.GetUriObjectFromUriString(decoded, page.AbsoluteUri);
// //no duplicated links
// if (linksToSave.All(o => o.AbsoluteUri != childUri.AbsoluteUri))
// linksToSave.Add(childUri);
// }
// Console.WriteLine($"html links parsed {stopWatch.ElapsedMilliseconds}");
// //save links & relations to db
// if (linksToSave.Count > 0)
// {
// //Console.WriteLine($"\tthere are {linksToSave.Count} unique links");
// //Console.WriteLine($"\tchecking db for existence...");
// var lstUri = linksToSave.Select(o => o.AbsoluteUri).ToList();
// var pages = _db.Uri.Where(o => lstUri.Contains(o.AbsoluteUri)).ToList();
// //Console.WriteLine($"\t{pages.Count} of them are already in db");
// Console.WriteLine($"uri pages fetched {stopWatch.ElapsedMilliseconds}");
// //save pages
// //Console.WriteLine($"\tsaving pages...");
// foreach (var linkToSave in linksToSave)
// {
// var childPage = pages.FirstOrDefault(p => p.AbsoluteUri == linkToSave.AbsoluteUri);
// if (childPage == null)
// {
// childPage = NewUriDbModel(linkToSave);
// _db.Uri.Add(childPage);
// }
// }
// _db.SaveChanges();
// Console.WriteLine($"uri pages saved {stopWatch.ElapsedMilliseconds}");
// //save relations
// //Console.WriteLine($"\trefetching {lstUri.Count} pages from db...");
// pages = _db.Uri.Where(o => lstUri.Contains(o.AbsoluteUri)).ToList();
// //Console.WriteLine($"\tchecking existing relations...");
// var relations = _db.Relation.Where(o => o.ParentId == page.Id).ToList();
// //Console.WriteLine($"\t{relations.Count} of them are already in db");
// //Console.WriteLine($"\tsaving relations...");
// Console.WriteLine($"relations fetched {stopWatch.ElapsedMilliseconds}");
// foreach (var linkToSave in linksToSave)
// {
// var childPage = pages.FirstOrDefault(p => p.AbsoluteUri == linkToSave.AbsoluteUri);
// var relation = relations.FirstOrDefault(o => o.ChildId == childPage.Id);
// if (relation == null)
// {
// relation = new Relation()
// {
// ParentId = page.Id,
// ChildId = childPage.Id,
// CreatedAt = DateTime.UtcNow,
// };
// _db.Relation.Add(relation);
// }
// }
// _db.SaveChanges();
// Console.WriteLine($"relations saved {stopWatch.ElapsedMilliseconds}");
// }
// //find canonical
// var canonicalLinks = crawlResult.Doc.DocumentNode.SelectNodes("//link[@rel='canonical']");
// if (canonicalLinks != null && canonicalLinks.Count > 0)
// {
// var canonicalLinkValue = canonicalLinks[0].Attributes["href"].Value;
// //Console.WriteLine($"\tfound canonical");
// page.Canonical = canonicalLinkValue;
// Console.WriteLine($"canonical extracted {stopWatch.ElapsedMilliseconds}");
// }
// page.ContentLength = crawlResult.Doc.ParsedText.Length;
// }
// page.CrawledAt = crawlResult.CrawledAt;
// page.StatusCode = crawlResult.StatusCode;
// page.StatusCodeString = crawlResult.StatusCodeStr;
// page.TimeTaken = crawlResult.TimeTaken;
// _db.SaveChanges();
// Console.WriteLine($"everything saved {stopWatch.ElapsedMilliseconds}");
//}
//private void CrawlPages(CrawlerContext db, string host)
//{
// //var pagesToCrawl = GetPagesToCrawl(db, _hosts);
// var pagesToCrawl = new List<Uri>();
// Console.WriteLine($"Found {pagesToCrawl.Count} pages to crawl.");
// Console.WriteLine();
// var web = new HtmlWeb();
// web.CaptureRedirect = true;
// web.PostResponse = (request, response) => HtmlWeb_PostResponse(request, response);
// for (var i = 0; i < pagesToCrawl.Count; i++)
// {
// var page = pagesToCrawl[i];
// Console.WriteLine($"{i + 1}/{pagesToCrawl.Count} {page.AbsoluteUri}");
// var stopWatch = new Stopwatch();
// stopWatch.Start();
// HtmlDocument doc;
// try
// {
// doc = web.Load(page.AbsoluteUri);
// }
// catch (Exception e)
// {
// Console.WriteLine(e);
// page.FailedAt = DateTime.UtcNow;
// page.FailedException = e.ToString();
// db.SaveChanges();
// Console.WriteLine();
// continue;
// }
// stopWatch.Stop();
// var statusCode = (int)web.StatusCode;
// var statusCodeString = web.StatusCode.ToString();
// var timeTaken = stopWatch.Elapsed.TotalSeconds;
// //not 200 OK
// if (web.StatusCode != HttpStatusCode.OK)
// {
// Console.WriteLine($"\tstatus code = {statusCode}");
// //3xx redirect
// if (statusCode / 100 == 3)
// {
// //Console.WriteLine($"\tfound redirect {statusCode} {_redirectLocation}");
// var locationUri = GetUriObjectFromUriString(_redirectLocation, page.AbsoluteUri);
// Console.WriteLine($"\tfound new location {locationUri.AbsoluteUri}");
// //var linkKey = locationUri.AbsoluteUri.TruncateMax(MAX_URI_LEN);
// //add destination to db
// var destinationPage = db.Uri.FirstOrDefault(o => o.AbsoluteUri == locationUri.AbsoluteUri);
// if (destinationPage == null)
// {
// Console.WriteLine($"\tadding destination page to db...");
// destinationPage = NewUriDbModel(locationUri);
// db.Uri.Add(destinationPage);
// db.SaveChanges();
// }
// else
// Console.WriteLine($"\tdestination page already exists in db...");
// //add redirect relations
// var redirectRelation = db.RedirectRelation.FirstOrDefault(o =>
// o.SourceId == page.Id && o.DestinationId == destinationPage.Id);
// if (redirectRelation == null)
// {
// Console.WriteLine($"\tsaving redirect relation to db...");
// redirectRelation = new RedirectRelation()
// {
// SourceId = page.Id,
// DestinationId = destinationPage.Id,
// CreatedAt = DateTime.UtcNow,
// };
// db.RedirectRelation.Add(redirectRelation);
// db.SaveChanges();
// }
// else
// Console.WriteLine($"\tredirect relation already exists in db...");
// }
// //save page info
// page.CrawledAt = DateTime.UtcNow;
// page.StatusCodeString = statusCodeString;
// page.StatusCode = statusCode;
// page.TimeTaken = (decimal?)timeTaken;
// db.SaveChanges();
// Console.WriteLine();
// continue;
// }
// //not a document
// if (doc.ParsedText == null)
// {
// page.CrawledAt = DateTime.UtcNow;
// page.StatusCodeString = statusCodeString;
// page.StatusCode = statusCode;
// page.TimeTaken = (decimal?)timeTaken;
// db.SaveChanges();
// Console.WriteLine();
// continue;
// }
// var links = doc.DocumentNode.SelectNodes("//a[@href]");
// Console.WriteLine($"\tfound {links.Count} child links.");
// var linksToSave = new List<System.Uri>();
// foreach (var link in links)
// {
// var href = link.Attributes["href"].Value;
// if (href == "" || href.StartsWith("javascript:"))
// continue;
// var decoded = HttpUtility.HtmlDecode(href);
// //if (decoded!= href)
// // Debugger.Break();
// var childUri = GetUriObjectFromUriString(decoded, page.AbsoluteUri);
// //Console.WriteLine($"\t{href}\r\n\t{childUri.AbsoluteUri}");
// //Console.WriteLine();
// //no duplicated links
// if (linksToSave.All(o => o.AbsoluteUri != childUri.AbsoluteUri))
// linksToSave.Add(childUri);
// }
// //save links & relations to db
// if (linksToSave.Count > 0)
// {
// //var uriKeyStrings = linksToSave.Select(o => o.AbsoluteUri.TruncateMax(MAX_URI_LEN)).Distinct().ToList();
// Console.WriteLine($"\tthere are {linksToSave.Count} unique links"
// //+$", {uriKeyStrings.Count} unique uri keys"
// );
// Console.WriteLine($"\tchecking db for existence...");
// var lstUri = linksToSave.Select(o => o.AbsoluteUri).ToList();
// var pages = db.Uri.Where(o => lstUri.Contains(o.AbsoluteUri)).ToList();
// //var childRelation = db.Relation.Where(o => o.ParentId == page.Id).ToList();
// Console.WriteLine($"\t{pages.Count} of them are already in db");
// //save pages
// Console.WriteLine($"\tsaving pages...");
// //var keysAdded = new List<string>();
// foreach (var linkToSave in linksToSave)
// {
// //var uriKey = linkToSave.AbsoluteUri.TruncateMax(MAX_URI_LEN).ToLower();
// ////not add uris that are different but with same unique keys
// //if (keysAdded.Contains(uriKey))
// // continue;
// var childPage = pages.FirstOrDefault(p => p.AbsoluteUri == linkToSave.AbsoluteUri);
// if (childPage == null)
// {
// childPage = NewUriDbModel(linkToSave);
// //if (linkToSave.AbsoluteUri.Length > MAX_URI_LEN)
// // childPage.FullAbsoluteUri = linkToSave.AbsoluteUri;
// db.Uri.Add(childPage);
// //keysAdded.Add(uriKey);
// }
// }
// db.SaveChanges();
// //save relations
// Console.WriteLine($"\trefetching {lstUri.Count} pages from db...");
// pages = db.Uri.Where(o => lstUri.Contains(o.AbsoluteUri)).ToList();
// Console.WriteLine($"\tchecking existing relations...");
// var relations = db.Relation.Where(o => o.ParentId == page.Id).ToList();
// Console.WriteLine($"\t{relations.Count} of them are already in db");
// Console.WriteLine($"\tsaving relations...");
// foreach (var linkToSave in linksToSave)
// {
// //var uriKey = linkToSave.AbsoluteUri.TruncateMax(MAX_URI_LEN);
// var childPage = pages.FirstOrDefault(p => p.AbsoluteUri == linkToSave.AbsoluteUri);
// var relation = relations.FirstOrDefault(o => o.ChildId == childPage.Id);
// if (relation == null)
// {
// relation = new Relation()
// {
// ParentId = page.Id,
// ChildId = childPage.Id,
// CreatedAt = DateTime.UtcNow,
// };
// db.Relation.Add(relation);
// }
// }
// db.SaveChanges();
// }
// //find canonical
// var canonicalLinks = doc.DocumentNode.SelectNodes("//link[@rel='canonical']");
// if (canonicalLinks != null && canonicalLinks.Count > 0)
// {
// var canonicalLinkValue = canonicalLinks[0].Attributes["href"].Value;
// Console.WriteLine($"\tfound canonical"
// //+$": {canonicalLinkValue}"
// );
// page.Canonical = canonicalLinkValue;
// }
// //save page info
// var contentLength = doc.ParsedText.Length;
// var content = doc.ParsedText;
// page.CrawledAt = DateTime.UtcNow;
// //page.Content = content;
// page.ContentLength = contentLength;
// page.StatusCodeString = statusCodeString;
// page.StatusCode = statusCode;
// page.TimeTaken = (decimal?)timeTaken;
// db.SaveChanges();
// Console.WriteLine();
// }
//}
private List <CrawlPlan> GetPagesToCrawl(string[] hosts)
{
var db = CrawlerContext.Create(_dbConStr);
Console.WriteLine("loading uncrawled pages...");
List <CrawlPlan> pagesToCrawl;
//pagesToCrawl = db.Uri.Where(o => !o.CrawledAt.HasValue
// && hosts.Contains(o.Host)
// && o.Fragment == ""
// && o.Query == ""
// && !o.AbsoluteUri.Contains("c!")
// && !o.AbsoluteUri.Contains("i!")
// && !o.AbsoluteUri.Contains("a!")
// && !o.AbsoluteUri.Contains("p!")
// && !o.AbsoluteUri.EndsWith(".png")
// && !o.AbsoluteUri.EndsWith(".gif")
// && !o.AbsoluteUri.EndsWith(".jpg")
// )
// .OrderBy(o => o.Id)
// .Select(o => new CrawlPlan()
// {
// AbsoluteUri = o.AbsoluteUri
// })
// .ToList();
//if (pagesToCrawl.Count < 100)
//{
// Console.WriteLine("loading uncrawled pages (2)...");
// pagesToCrawl = db.Uri.Where(o => !o.CrawledAt.HasValue
// && hosts.Contains(o.Host)
// && o.Fragment == ""
// && o.Query == ""
// //&& !o.AbsoluteUri.Contains("c!")
// //&& !o.AbsoluteUri.Contains("i!")
// //&& !o.AbsoluteUri.Contains("a!")
// //&& !o.AbsoluteUri.Contains("p!")
// && !o.AbsoluteUri.EndsWith(".png")
// && !o.AbsoluteUri.EndsWith(".gif")
// && !o.AbsoluteUri.EndsWith(".jpg")
// )
// .OrderBy(o => o.Id)
// .Select(o => new CrawlPlan()
// {
// AbsoluteUri = o.AbsoluteUri
// })
// .ToList();
//}
//if (pagesToCrawl.Count < 100)
//{
//Console.WriteLine("loading uncrawled pages (3)...");
pagesToCrawl = db.Uri.Where(o => !o.CrawledAt.HasValue &&
(o.Scheme == "http" || o.Scheme == "https") &&
hosts.Contains(o.Host) &&
o.Fragment == ""
//&& o.Query == ""
//&& !o.AbsoluteUri.Contains("c!")
//&& !o.AbsoluteUri.Contains("i!")
//&& !o.AbsoluteUri.Contains("a!")
//&& !o.AbsoluteUri.Contains("p!")
&& !o.AbsoluteUri.EndsWith(".png") &&
!o.AbsoluteUri.EndsWith(".gif") &&
!o.AbsoluteUri.EndsWith(".jpg")
)
.OrderBy(o => o.Id)
.Select(o => new CrawlPlan()
{
AbsoluteUri = o.AbsoluteUri
})
.ToList();
//}
//recrawl 5xx pages
//pagesToCrawl = db.Uri.Where(o => o.CrawledAt.HasValue && o.StatusCode.ToString().StartsWith("5")
// && (o.Scheme == "http" || o.Scheme == "https")
// && hosts.Contains(o.Host)
// && o.Fragment == ""
// //&& o.Query == ""
// //&& !o.AbsoluteUri.Contains("c!")
// //&& !o.AbsoluteUri.Contains("i!")
// //&& !o.AbsoluteUri.Contains("a!")
// //&& !o.AbsoluteUri.Contains("p!")
// && !o.AbsoluteUri.EndsWith(".png")
// && !o.AbsoluteUri.EndsWith(".gif")
// && !o.AbsoluteUri.EndsWith(".jpg")
// )
// .OrderBy(o => o.Id)
// .Select(o => new CrawlPlan()
// {
// AbsoluteUri = o.AbsoluteUri
// })
// .ToList();
return(pagesToCrawl);
}
//const int MAX_URI_LEN = 450;
static void Main(string[] args)
{
ThreadPool.SetMinThreads(1000, 1000);
IConfiguration Configuration = new ConfigurationBuilder()
.AddJsonFile("appsettings.json", optional: true, reloadOnChange: true)
.Build();
if (args.Length > 0 && args[0] == "indexer")
{
var esConfig = Configuration.GetSection("ESConnection");
var settings = new ConnectionSettings(new System.Uri(esConfig["Host"]))
.DefaultIndex("uri").BasicAuthentication(esConfig["Username"], esConfig["Password"]);
var elasticClient = new ElasticClient(settings);
//var uri = new Uri { AbsoluteUri = "key1", BrowserContent = "<fkjaslkdf>a sdlfjlasjdflsM</asdf> lkafsjiw fasd fjl<a></a>", CrawledAt = DateTime.UtcNow };
//var indexResponse = elasticClient.IndexDocument(uri);
var db = CrawlerContext.Create(Configuration.GetConnectionString("CrawlerDatabase"));
Console.WriteLine($"Fetching db data...");
var uriDocuments = db.Uri.Where(o => o.Content != null)
.OrderBy(o => o.Id)
.Select(o => new UriDocument()
{
AbsoluteUri = o.AbsoluteUri,
BrowserHtml = o.BrowserContent ?? o.Content,
Id = o.Id,
OriginalUriString = o.OriginalString,
})
.ToList();
Console.WriteLine($"Parsing html and generating doc text...");
var htmlDoc = new HtmlDocument();
foreach (var doc in uriDocuments)
{
htmlDoc.LoadHtml(doc.BrowserHtml);
var htmlBody = htmlDoc.DocumentNode.SelectSingleNode("//html");
doc.BrowserText = htmlBody.InnerText.Trim();
}
Console.WriteLine($"Saving to ES...");
var bulkAllObservable = elasticClient.BulkAll(uriDocuments, b => b
.Index("uri")
// how long to wait between retries
.BackOffTime("30s")
// how many retries are attempted if a failure occurs
.BackOffRetries(2)
// refresh the index once the bulk operation completes
.RefreshOnCompleted()
// how many concurrent bulk requests to make
.MaxDegreeOfParallelism(Environment.ProcessorCount)
// number of items per bulk request
.Size(1000)
//.RetryDocumentPredicate((item, person) =>
//{
// // decide if a document should be retried in the event of a failure
// return item.Error.Index == "even-index" && person.FirstName == "Martijn";
//})
.DroppedDocumentCallback((item, uri) =>
{
// if a document cannot be indexed this delegate is called
Console.WriteLine($"Unable to index: {item} {uri}");
})
)
// Perform the indexing, waiting up to 15 minutes.
// Whilst the BulkAll calls are asynchronous this is a blocking operation
.Wait(TimeSpan.FromMinutes(15), next =>
{
// do something on each response e.g. write number of batches indexed to console
Console.WriteLine($"ES Bulked Items: {next.Items.Count}");
Console.WriteLine(
$"{next.Items.GroupBy(o => o.Result).Select(o => o.Key + ":" + o.Count()).Aggregate((o, n) => o + " " + n)}");
});
//Console.ReadKey();
return;
}
//var db = CrawlerContext.Create(Configuration.GetConnectionString("CrawlerDatabase"));
//var u1 = new Uri { AbsoluteUri = "key1" };
//var u2 = new Uri { AbsoluteUri = "key2" };
//var u3 = new Uri { AbsoluteUri = "key1" };
//var list = new List<Uri> { u1, u2, u3 };
////db.Uri.Add(u1);
////db.Uri.Add(u2);
////db.SaveChanges();
////db.BulkInsertOrUpdate(list);
//db.BulkMerge(list, options => options.ColumnPrimaryKeyExpression = o => o.AbsoluteUri);
const string startPage = "https://www.domain.com/";
//var browserWebCrawler = new BrowserWebCrawler();
//var crawlResult = browserWebCrawler.CrawlPage(new CrawlPlan() {AbsoluteUri = "https://www.playerauctions.com/wow-account"});
//var staticWebCrawler = new StaticWebCrawler();
//var crawlResult = staticWebCrawler.CrawlPage(new CrawlPlan() { AbsoluteUri = "https://www.playerauctions.com/wow-gold/" });
var crawler = new LightningCrawler(Configuration.GetConnectionString("CrawlerDatabase"), startPage, new string[]
{
"www.domain.com",
"subdomain1.domain.com",
"subdomain2.domain.com",
},
20,
2,
0);
crawler.Run();
}
