private async Task ProcessHtmlAsync(HttpClient client, ConcurrentHashSet <Uri> downloadedLinks, Uri uri, int level)
{
_logger.LogInfo($"Found html: {uri}");
if (!IsValidUri(uri, ConstraintType.Url))
{
return;
}
var response = await client.GetAsync(uri);
var document = new HtmlDocument();
var htmlStream = await response.Content.ReadAsStreamAsync();
document.Load(htmlStream, Encoding.UTF8);
_logger.LogInfo($"Loaded html: {uri}");
await _saver.SaveHtmlAsync(uri, document);
var internalLinks = document.DocumentNode.Descendants()
.SelectMany(d => d.Attributes.Where(IsAttributeWithLink));
var internalLinkTasks = new List <Task>();
foreach (var internalLink in internalLinks)
{
var internalLinkTask = LoadUrlAsync(client, downloadedLinks, new Uri(client.BaseAddress, internalLink.Value), level + 1);
internalLinkTasks.Add(internalLinkTask);
}
await Task.WhenAll(internalLinkTasks);
}