public List <string> spawn(string url)
//public void spawn(string url)
{
HtmlWeb hw = new HtmlWeb();
HtmlDocument doc = new HtmlDocument();
List <string> hrefTags = new List <string>();
List <string> text = new List <string>();
List <string> links_from_this_page = new List <string>();
Random rnd = new Random();
int wait_time = 5000 + rnd.Next(1000);
//10000 + rnd.Next(1000);
//MONITOR.Log( "Elapsed: " + (DateTime.Now.Subtract(MONITOR.START_TIME).TotalMinutes.ToString() +" wt@"+wait_time + "mS " + url));
MONITOR.LogMulti("Elapsed: " + (DateTime.Now.Subtract(MONITOR.START_TIME).TotalMinutes.ToString() + ", wt@" + wait_time + "mS, " + url));
try
{
System.Threading.Thread.Sleep(wait_time);
doc = hw.Load(url);
}
catch (Exception e)
{
MONITOR.LogError(e.Message);
}
try
{
foreach (HtmlNode node in doc.DocumentNode.SelectNodes("//text()"))
{
text.Add(node.InnerText);
}
}
catch (Exception e)
{
MONITOR.LogError(e.Message);
}
try
{
foreach (HtmlNode link in doc.DocumentNode.SelectNodes("//a[@href]"))
{
HtmlAttribute att = link.Attributes["href"];
hrefTags.Add(att.Value);
}
}
catch (Exception e)
{
MONITOR.LogError(e.Message);
}
doc = null;
GC.Collect();
foreach (var tag in hrefTags)
{
if (Regex.IsMatch(tag, @"profile/"))
{
var user = tag.Split(("/").ToCharArray()).Last();
if (!MONITOR.listOfUniqueUsers.Contains(user))
{
using (SQLiteConnection qdbconnection = new SQLiteConnection("Data Source=D:/cache/quora.sqlite;Version=3"))
{
qdbconnection.Open();
SQLiteCommand command = new SQLiteCommand(@"INSERT INTO quora (name, link) values ('" + user + "', '" + url + "')", qdbconnection);
command.ExecuteNonQuery();
}
MONITOR.listOfUniqueUsers.Add(user);
}
}
}
//using (StreamWriter sw2 = File.AppendText(@"D:/cache/cache-quora-text.txt"))
//{
// sw2.WriteLine(String.Join(String.Empty, text.ToArray()));
//}
//using (StreamWriter sw = new StreamWriter(@"D:/cache/cache-quora-usernames.txt"))
//{
// sw.WriteLine(String.Join(Environment.NewLine, MONITOR.listOfUniqueUsers.ToArray()));
//}
//using (StreamWriter sw3 = new StreamWriter(@"D:/cache/cache-quora-visited-sites.txt"))
//{
// sw3.WriteLine(String.Join(Environment.NewLine, MONITOR.visitedpages.ToArray()));
//}
Parallel.ForEach(hrefTags, hrefTag =>
{
if (!hrefTag.Contains("topic") && !hrefTag.Contains("profile") && !hrefTag.Contains("answer") && !hrefTag.Contains("careers/"))
{
//if (!MONITOR.visitedpages.Contains(hrefTag))
//{
if (hrefTag[0].Equals('/') && hrefTag.Contains("-"))
{
try
{
links_from_this_page.Add(@"https://www.quora.com" + hrefTag.Trim(Environment.NewLine.ToCharArray()));
MONITOR.listOfUnvisitedPages.Add(@"https://www.quora.com" + hrefTag.Trim(Environment.NewLine.ToCharArray()));
}
catch (Exception e)
{
MONITOR.LogError(e.Message + e.StackTrace);
}
//using (spider n = new spider())
//{
// n.spawn(@"https://www.quora.com" + hrefTag);
// Dispose();
//}
}
//}
}
});
//MONITOR.visitedpages.Add(url);
return(links_from_this_page);
}
//Server=localhost\SQLEXPRESS;Database=master;Trusted_Connection=True;
static void Main(string[] args)
{
Console.SetBufferSize(480, 160);
string url = @"https://www.quora.com/Can-social-networks-be-scraped-for-data";
string url2 = @"https://www.instagram.com/angiesuco/";
MONITOR.START_TIME = DateTime.Now;
MONITOR.pages_visited = 0;
MONITOR.objects_disposed = 0;
//using (spider s = new spider())
//{
// s.spawn(url);
//}
//foreach(var child in MONITOR.listOfUnvisitedPages)
//{
// using (spider s = new spider())
// {
// s.spawn(child);
// }
//}
var stack = new Stack <List <string> >();
using (spider n = new spider())
{
stack.Push(n.spawn(url));
while (stack.Any())
{
try
{
var current = stack.Pop();
foreach (var child in current)
{
try
{
using (spider n2 = new spider())
{
stack.Push(n2.spawn(child));
}
}
catch (Exception e)
{
MONITOR.LogError(e.Message);
}
}
}
catch (Exception e)
{
MONITOR.LogError(e.Message);
}
}
}
Console.WriteLine("PAGES VISITED: " + MONITOR.pages_visited + ". OBJECTS DISPOSED: " + MONITOR.objects_disposed);
//using (spider n = new spider())
//{
// Parallel.ForEach( n.spawn(url), page =>{
// using (spider n2 = new spider())
// {
// n2.spawn(page);
// }
// });
//}
}
