private async Task DoScrapeAsync(ScrapeParameters parameters, object state)
{
//strange because here only one infohash???
//or get all torrent infohash so loop on torrents of client engine
var infohashs = new List <byte[]>(1)
{
parameters.InfoHash.Hash
};
var message = new ScrapeMessage(DateTime.Now.GetHashCode(), _connectionId, infohashs);
var responseBytes = await SendAndReceiveAsync(message);
var udpTrackerMessage = Receive(message, responseBytes);
if (!(udpTrackerMessage is ScrapeResponseMessage))
{
DoScrapeComplete(false, state);
}
else
{
CompleteScrape(udpTrackerMessage, state);
}
}
public override async void Scrape(ScrapeParameters parameters, object state)
{
try
{
await _semaphoreSlim.WaitAsync();
try
{
if (!_hasConnected)
{
await ConnectAsync();
}
await DoScrapeAsync(parameters, state);
}
finally
{
_semaphoreSlim.Release();
}
}
catch
{
DoScrapeComplete(false, state);
}
}
public abstract void Scrape(ScrapeParameters parameters, object state);
public override async void Scrape(ScrapeParameters parameters, object state)
{
var message = "";
try
{
var url = ScrapeUri.OriginalString;
// If you want to scrape the tracker for *all* torrents, don't append the info_hash.
if (url.IndexOf('?') == -1)
{
url += "?info_hash=" + parameters.InfoHash.UrlEncode();
}
else
{
url += "&info_hash=" + parameters.InfoHash.UrlEncode();
}
using (var httpClient = new HttpClient())
{
var request = new HttpRequestMessage(HttpMethod.Get, url);
request.Headers.UserAgent.ParseAdd(VersionInfo.ClientVersion);
var httpResponseMessage = await httpClient.SendAsync(request);
if (httpResponseMessage.StatusCode == HttpStatusCode.OK)
{
var stream = await httpResponseMessage.Content.ReadAsStreamAsync();
var dict = DecodeResponse(stream);
// FIXME: Log the failure?
if (!dict.ContainsKey("files"))
{
message = "Response contained no data";
}
else
{
var files = (BEncodedDictionary)dict["files"];
foreach (var kp in files.Select(keypair => (BEncodedDictionary)keypair.Value).SelectMany(d => d))
{
switch (kp.Key.ToString())
{
case ("complete"):
Complete = (int)((BEncodedNumber)kp.Value).Number;
break;
case ("downloaded"):
Downloaded = (int)((BEncodedNumber)kp.Value).Number;
break;
case ("incomplete"):
Incomplete = (int)((BEncodedNumber)kp.Value).Number;
break;
default:
Debug.WriteLine(null,
"HttpTracker - Unknown scrape tag received: Key {0} Value {1}", kp.Key,
kp.Value);
break;
}
}
}
}
else
{
message = string.Format("The tracker could not be contacted {0}", httpResponseMessage.StatusCode);
}
}
}
catch (WebException)
{
message = "The tracker could not be contacted";
}
catch (IOException ex)
{
message = ex.Message;
}
catch
{
message = "The tracker returned an invalid or incomplete response";
}
finally
{
RaiseScrapeComplete(new ScrapeResponseEventArgs(this, state, string.IsNullOrEmpty(message)));
}
}
