private void SendAnnounceRequest(TrackerGetHttpEntry entry)
{
StringBuilder builder = new StringBuilder(1024);
string authority = entry.Address.Authority;
string resource = entry.Address.GetComponents(UriComponents.Path, UriFormat.Unescaped);
builder.Append("GET /");
builder.Append(resource);
builder.AppendHash(entry.Request.Hash);
builder.AppendPeer(entry.Request.Peer ?? context.Configuration.Peer);
builder.AppendPort(entry.Request);
builder.AppendEvent(entry.Request);
builder.AppendProgress(entry.Request);
builder.Append("&compact=1&no_peer_id=1");
builder.AppendLine(" HTTP/1.1");
builder.Append("Host: ");
builder.AppendLine(authority);
builder.AppendLine();
byte[] data = Encoding.ASCII.GetBytes(builder.ToString());
SocketBuffer outgoing = new SocketBuffer(data);
entry.Status = TrackerGetHttpStatus.Announcing;
entry.Socket.Send(outgoing, OnSent(entry));
entry.Socket.Receive(entry.Buffer, OnReceived(entry));
}
private void ConnectToHost(TrackerGetHttpEntry entry)
{
entry.Status = TrackerGetHttpStatus.Connecting;
entry.Buffer = new SocketBuffer(16384);
entry.Socket.Bind();
entry.Socket.Connect(entry.Endpoint, OnConnected(entry));
}
public void Register(TrackerGetHttpRegistrant registrant)
{
TcpSocket socket = factory.Tcp();
TrackerGetHttpEntry entry = collection.Add(socket);
entry.Request = registrant.Request;
entry.Address = registrant.Address;
entry.Callback = registrant.Callback;
entry.Deadline = DateTime.Now + TimeSpan.FromSeconds(context.Configuration.Timeout);
}
public TrackerGetHttpEntry Add(TcpSocket socket)
{
TrackerGetHttpEntry entry = new TrackerGetHttpEntry
{
Status = TrackerGetHttpStatus.Pending,
Socket = socket,
};
items.Add(socket, entry);
return(entry);
}
private TcpSocketSendCallback OnSent(TrackerGetHttpEntry entry)
{
return(sent =>
{
if (sent.Status == SocketStatus.OK)
{
context.Queue.Add(() =>
{
context.CallPacketSent(entry.Address, entry.Request.Hash, entry.Endpoint, sent.Count);
});
}
});
}
private TcpSocketConnectCallback OnConnected(TrackerGetHttpEntry entry)
{
return(connected =>
{
if (connected.Status == SocketStatus.OK)
{
Action callback = () =>
{
context.CallConnected(entry.Address, entry.Request.Hash);
};
entry.Status = TrackerGetHttpStatus.Connected;
context.Queue.Add(callback);
}
});
}
private void ResolveHost(TrackerGetHttpEntry entry)
{
try
{
entry.Status = TrackerGetHttpStatus.Resolving;
IPHostEntry found = Dns.GetHostEntry(entry.Address.Host);
IPAddress address = found.AddressList.FirstOrDefault();
entry.Endpoint = new IPEndPoint(address, entry.Address.Port);
entry.Status = TrackerGetHttpStatus.Resolved;
}
catch (Exception ex)
{
context.CallFailed(entry.Address, entry.Request.Hash, ex.Message);
}
}
private void HandleDeadline(TrackerGetHttpEntry entry)
{
collection.Remove(entry.Socket);
context.CallTimeout(entry.Address, entry.Request.Hash);
}
private TcpSocketReceiveCallback OnReceived(TrackerGetHttpEntry entry)
{
return(received =>
{
if (received.Status == SocketStatus.OK)
{
context.Queue.Add(() =>
{
byte[] data = Bytes.Copy(entry.Buffer.Data, entry.Buffer.Offset, received.Count);
string text = Encoding.ASCII.GetString(data);
context.CallPacketReceived(entry.Endpoint, data.Length);
if (text.StartsWith(TrackerGetHttpProtocol.ResponseHeader) == false)
{
context.CallPacketIgnored(entry.Endpoint, data.Length);
return;
}
int counter = 0, position = 0;
bool r = false, n = false;
for (int i = 0; i < data.Length; i++)
{
if (data[i] == '\r')
{
r = true;
counter++;
continue;
}
if (data[i] == '\n')
{
n = true;
counter++;
continue;
}
if (counter == 4 && r && n)
{
position = i;
break;
}
if (counter == 2 && !(r && n))
{
position = i;
break;
}
counter = 0;
}
if (position == 0)
{
context.CallPacketIgnored(entry.Endpoint, data.Length);
return;
}
BencodedValue decoded = Bencoder.Decode(data, position);
if (decoded.Dictionary == null)
{
context.CallPacketIgnored(entry.Endpoint, data.Length);
return;
}
string failure = decoded.Find("failure reason", x => x?.Text?.GetString());
if (failure != null)
{
context.CallFailed(entry.Address, entry.Request.Hash, failure);
return;
}
int?interval = decoded.Find("interval", x => x?.ToInt32());
BencodedValue peers = decoded.Find("peers", x => x);
if (interval != null && peers.Text != null && peers.Text.Length % 6 == 0)
{
List <NetworkAddress> result = new List <NetworkAddress>(peers.Text.Length / 6);
byte[] bytes = peers.Data.GetBytes();
for (int i = 0; i < bytes.Length; i += 6)
{
int port = Bytes.ReadUInt16(bytes, i + 4);
StringBuilder address = new StringBuilder();
address.Append(bytes[i].ToString());
address.Append('.');
address.Append(bytes[i + 1].ToString());
address.Append('.');
address.Append(bytes[i + 2].ToString());
address.Append('.');
address.Append(bytes[i + 3].ToString());
if (port > 0)
{
result.Add(new NetworkAddress(address.ToString(), port));
}
}
collection.Remove(entry.Socket);
entry.Callback.Invoke(TimeSpan.FromSeconds(interval.Value));
context.CallAnnounced(entry.Address, entry.Request.Hash, TimeSpan.FromSeconds(interval.Value), result.ToArray());
}
});
}
});
}
