public static UdpTrackerMessage DecodeMessage(byte[] buffer, int offset, int count, MessageType type)
{
UdpTrackerMessage m = null;
int action = type == MessageType.Request ? ReadInt(buffer, offset + 8) : ReadInt(buffer, offset);
switch (action)
{
case 0:
if (type == MessageType.Request)
m = new ConnectMessage();
else
m = new ConnectResponseMessage();
break;
case 1:
if (type == MessageType.Request)
m = new AnnounceMessage();
else
m = new AnnounceResponseMessage();
break;
case 2:
if (type == MessageType.Request)
m = new ScrapeMessage();
else
m = new ScrapeResponseMessage();
break;
case 3:
m = new ErrorMessage();
break;
default:
throw new ProtocolException(string.Format("Invalid udp message received: {0}", buffer[offset]));
}
try
{
m.Decode(buffer, offset, count);
}
catch
{
m = new ErrorMessage(0, "Couldn't decode the tracker response");
}
return m;
}
protected virtual void ReceiveError(ErrorMessage errorMessage)
{
throw new ProtocolException(string.Format("ErrorMessage from :{0}", endpoint.Address));
}
protected virtual void ReceiveScrape(ScrapeMessage scrapeMessage)
{
var val = Handle(getCollection(scrapeMessage), endpoint.Address, true);
UdpTrackerMessage m;
byte[] data;
if (val.ContainsKey(RequestParameters.FailureKey))
{
m = new ErrorMessage(scrapeMessage.TransactionId, val[RequestParameters.FailureKey].ToString());
}
else
{
var scrapes = new List<ScrapeDetails>();
foreach (var keypair in val)
{
var dict = (BEncodedDictionary) keypair.Value;
var seeds = 0;
var leeches = 0;
var complete = 0;
foreach (var keypair2 in dict)
{
switch (keypair2.Key.Text)
{
case "complete": //The current number of connected seeds
seeds = Convert.ToInt32(keypair2.Value.ToString());
break;
case "downloaded": //The total number of completed downloads
complete = Convert.ToInt32(keypair2.Value.ToString());
break;
case "incomplete":
leeches = Convert.ToInt32(keypair2.Value.ToString());
break;
}
}
var sd = new ScrapeDetails(seeds, leeches, complete);
scrapes.Add(sd);
if (scrapes.Count == 74) //protocole do not support to send more than 74 scrape at once...
{
m = new ScrapeResponseMessage(scrapeMessage.TransactionId, scrapes);
data = m.Encode();
listener.Send(data, data.Length, endpoint);
scrapes.Clear();
}
}
m = new ScrapeResponseMessage(scrapeMessage.TransactionId, scrapes);
}
data = m.Encode();
listener.Send(data, data.Length, endpoint);
}
//QUICKHACK: format bencoded val and get it back wereas must refactor tracker system to have more generic object...
protected virtual void ReceiveAnnounce(AnnounceMessage announceMessage)
{
UdpTrackerMessage m;
var dict = Handle(getCollection(announceMessage), endpoint.Address, false);
if (dict.ContainsKey(RequestParameters.FailureKey))
{
m = new ErrorMessage(announceMessage.TransactionId, dict[RequestParameters.FailureKey].ToString());
}
else
{
var interval = TimeSpan.Zero;
var leechers = 0;
var seeders = 0;
var peers = new List<Client.Peer>();
foreach (var keypair in dict)
{
switch (keypair.Key.Text)
{
case "complete":
seeders = Convert.ToInt32(keypair.Value.ToString()); //same as seeder?
break;
case "incomplete":
leechers = Convert.ToInt32(keypair.Value.ToString()); //same as leecher?
break;
case "interval":
interval = TimeSpan.FromSeconds(int.Parse(keypair.Value.ToString()));
break;
case "peers":
if (keypair.Value is BEncodedList) // Non-compact response
peers.AddRange(Client.Peer.Decode((BEncodedList) keypair.Value));
else if (keypair.Value is BEncodedString) // Compact response
peers.AddRange(Client.Peer.Decode((BEncodedString) keypair.Value));
break;
default:
break;
}
}
m = new AnnounceResponseMessage(announceMessage.TransactionId, interval, leechers, seeders, peers);
}
var data = m.Encode();
listener.Send(data, data.Length, endpoint);
}
protected override void ReceiveError(ErrorMessage errorMessage)
{
if (!IgnoreErrors)
base.ReceiveError(errorMessage);
}