private static void RetrieveDataEstante()
{
Logger.Setup();
_logger = LogManager.GetLogger(typeof(Program));
ScrapaContext scrapaContext = new ScrapaContext();
EstanteRepository estanteRepository = new EstanteRepository(scrapaContext);
LivroRepository livroRepository = new LivroRepository(scrapaContext);
//ScrapTipoEstantes(estanteRepository);
string baseUrl = "https://www.estantevirtual.com.br";
IEnumerable <Estante> estantes = estanteRepository.GetAll().Where(e => e.IdEstante > 38).ToList();
foreach (Estante estante in estantes)
{
Console.WriteLine($@"Starting with estante {estante.Nome}");
_logger.Info($"Starting with Estante {estante.Nome}");
try
{
CancellationTokenSource producerCancellationToken = new CancellationTokenSource();
CancellationTokenSource consumerCancellationToken = new CancellationTokenSource();
BlockingCollection <HtmlNode> pageCollection = new BlockingCollection <HtmlNode>(250);
Task producerThread = Task.Factory.StartNew(() =>
{
int i = -1;
Parallel.For(0, 350,
new ParallelOptions()
{
MaxDegreeOfParallelism = 3, CancellationToken = producerCancellationToken.Token
},
(iPage) =>
{
if (producerCancellationToken.Token.IsCancellationRequested)
{
pageCollection.CompleteAdding();
}
Interlocked.Increment(ref i);
//for (int iPage = 0; iPage < 250; ++iPage)
Console.WriteLine($"Retriving {i}.");
_logger.Info($"Retriving {i}.");
HtmlAgilityPack.HtmlDocument getPage = new HtmlAgilityPack.HtmlDocument();
HttpDownloader htmlDownloader =
new HttpDownloader($"{estante.Link}&offset={i}", null, null);
getPage.LoadHtml(htmlDownloader.GetPage());
pageCollection.Add(getPage.DocumentNode);
int sleepTime = new Random(DateTime.Now.Millisecond).Next(5, 50);
Console.WriteLine(
$@"Sleeping for {sleepTime}. Page {i}. is ready. OnThread: {
Thread.CurrentThread.ManagedThreadId
})");
_logger.Info(
$"Sleeping for {sleepTime}. Page {i}. is ready (OnThread: {Thread.CurrentThread.ManagedThreadId})");
});
pageCollection.CompleteAdding();
});
Task consumerThread = Task.Factory.StartNew(() =>
{
long iPage = 0;
long errorCount = 0;
Parallel.For(0, 350, new ParallelOptions()
{
MaxDegreeOfParallelism = 3, CancellationToken = consumerCancellationToken.Token
}, (i) =>
{
consumerCancellationToken.Token.ThrowIfCancellationRequested();
Interlocked.Increment(ref iPage);
try
{
if (pageCollection.TryTake(out HtmlNode item, TimeSpan.FromSeconds(30)) == false)
{
if (producerCancellationToken.Token.IsCancellationRequested && pageCollection.Count == 0)
{
consumerCancellationToken.Cancel();
return;
}
}
;
HtmlNodeCollection books =
item.SelectNodes("//*[contains(@class, 'js-busca-resultados')]/a");
ConcurrentBag <HtmlNode> booksConcurrentBag =
new ConcurrentBag <HtmlNode>(books.ToList());
ConcurrentBag <Livro> livros = new ConcurrentBag <Livro>();
Parallel.ForEach(
booksConcurrentBag,
new ParallelOptions {
MaxDegreeOfParallelism = 20
},
book =>
{
HtmlNode header =
book.ChildNodes.FirstOrDefault(
d => d.Attributes.Contains("class") &&
d.Attributes["class"].Value.Contains("breslt-header"));
string bookName = header
.ChildNodes
.FirstOrDefault(d => d.Attributes.Contains("class")
&&
d.Attributes["class"]
.Value.Contains("busca-title"))
.InnerText;
string bookAuthor = header
.ChildNodes
.FirstOrDefault(d => d.Attributes.Contains("class")
&&
d.Attributes["class"]
.Value.Contains("busca-author"))
.InnerText;
if (livroRepository.Exists(bookName, bookAuthor))
{
return;
}
if (livros.Any(b =>
(string.Compare(bookName, b.Nome,
StringComparison.InvariantCultureIgnoreCase) == 0)
&&
(string.Compare(bookAuthor, b.Autor,
StringComparison.InvariantCultureIgnoreCase) == 0)))
{
return;
}
var url = book.Attributes["href"];
Uri uri = new Uri(baseUrl + url.Value);
Livro livro = new Livro();
livro.IdEstante = estante.IdEstante;
livro.Autor = bookAuthor;
livro.Nome = bookName;
livro.IdEstanteVirtual = long.Parse(uri.Segments[4]);
PriceStatistics pricestats =
new PriceStatisticsService().Get(livro.IdEstanteVirtual);
if (pricestats != null)
{
livro.QtdVendida = pricestats.QtdVendida;
livro.DtUltimaVenda = pricestats.DtUltimaVenda;
livro.ValorMaxVenda = pricestats.ValorMaxVenda;
livro.ValorMedioVenda = pricestats.ValorMedioVenda;
livro.ValorMinVenda = pricestats.ValorMinVenda;
livro.ValorUltimaVenda = pricestats.ValorUltimaVenda;
}
livros.Add(livro);
});
livroRepository.AddThreadSafe(livros);
int sleep = new Random(DateTime.Now.Millisecond).Next(50, 100);
Console.WriteLine($@"Sleeping for {sleep}. Page {iPage}. is finished");
_logger.Info($"Sleeping for {sleep}. Page {iPage}. is finished");
Console.WriteLine($@"Livros {livros.Count} gravados");
Thread.Sleep(sleep);
}
catch (Exception ex)
{
Console.WriteLine($@"Erro numero --> {Interlocked.Read(ref errorCount)}) <-- na Estante {estante.Nome}, na página {Interlocked.Read(ref iPage)} ERROR: {ex.Message}");
Interlocked.Increment(ref errorCount);
_logger.Fatal($"Erro fatal na estante {estante.Nome}. Página {iPage}", ex);
Console.WriteLine($@"Erro fatal na estante {estante.Nome}. Página {iPage}");
if (Interlocked.Read(ref errorCount) > 20)
{
producerCancellationToken.Cancel();
}
}
});