private void Callback(IAsyncResult ar)
{
var s = _socket.EndAccept(ar);
NewPeer?.Invoke(new PeerWireClient(s));
_socket.BeginAccept(Callback);
}
private void Process()
{
var buffer = new byte[200];
while (!_killSwitch)
{
EndPoint endPoint = new IPEndPoint(0, 0);
udpReaderSocket.ReceiveFrom(buffer, ref endPoint);
var remoteAddress = ((IPEndPoint)endPoint).Address;
var remotePort = 0;
var remoteHash = string.Empty;
var packet = Encoding.ASCII.GetString(buffer).Trim();
if (!packet.StartsWith("BT-SEARCH"))
{
continue;
}
var packetLines = packet.Split('\n');
foreach (var line in packetLines)
{
if (line.StartsWith("Port:"))
{
var portStr = line.Substring(5).Trim();
int.TryParse(portStr, out remotePort);
}
if (line.StartsWith("Infohash:"))
{
remoteHash = line.Substring(10, 40);
}
}
if (!string.IsNullOrEmpty(remoteHash) && remotePort != 0)
{
NewPeer?.Invoke(remoteAddress, remotePort, remoteHash);
}
}
}
private void OnMessageIn(string senderId, string messageType, string messagePayload)
{
if (disconnecting)
{
return;
}
DateTime messageTime = DateTime.UtcNow;
if (messageType.Equals("I_AM_HERE", StringComparison.InvariantCultureIgnoreCase))
{
TimeSpan statusExpirationTimeout = TimeSpan.FromSeconds(int.Parse(messagePayload));
bool newPeer = true;
if (peers.ContainsKey(senderId))
{
newPeer = false;
peers[senderId].Resurrect();
PeerStatusChanged?.Invoke(this, peers[senderId]);
}
string response = $"[\"{(int)Me.StatusExpirationTimeout.TotalSeconds}\", \"{Me.Status.ToString()}\"]";
SendImportantMessage(senderId, false, "HELLO", response, true)
.ContinueWith((res) =>
{
if (newPeer)
{
peers[senderId] = new SignalNowPeer(senderId, PeerStatus.Online, statusExpirationTimeout);
NewPeer?.Invoke(this, peers[senderId]);
}
});
}
else if (messageType.Equals("HELLO", StringComparison.InvariantCultureIgnoreCase))
{
JArray paramArray = JArray.Parse(messagePayload);
var timeoutStr = paramArray[0].ToString();
var statusStr = paramArray[1].ToString();
TimeSpan statusExpirationTimeout = TimeSpan.FromSeconds(int.Parse(timeoutStr));
PeerStatus status = (PeerStatus)Enum.Parse(typeof(PeerStatus), statusStr, true);
if (!peers.ContainsKey(senderId))
{
peers[senderId] = new SignalNowPeer(senderId, status, statusExpirationTimeout);
NewPeer?.Invoke(this, peers[senderId]);
}
else
{
peers[senderId].LastStatusTime = messageTime;
peers[senderId].Status = status;
peers[senderId].StatusExpirationTimeout = statusExpirationTimeout;
PeerStatusChanged?.Invoke(this, peers[senderId]);
}
}
else if (messageType.Equals("I_AM_OUTTA_HERE", StringComparison.InvariantCultureIgnoreCase))
{
if (peers.ContainsKey(senderId))
{
peers[senderId].Status = PeerStatus.Offline;
PeerStatusChanged?.Invoke(this, peers[senderId]);
#if UNITY_2018_2_OR_NEWER
UnityEngine.Debug.Log($"{senderId} quit.");
#else
System.Diagnostics.Debug.WriteLine($"{senderId} quit.");
#endif
}
}
else
{
// only respect messages from peers we had a handshake with
if (peers.ContainsKey(senderId))
{
peers[senderId].LastDataMessageTime = messageTime;
peers[senderId].LastStatusTime = messageTime;
if (messageType.Equals("STILL_HERE", StringComparison.InvariantCultureIgnoreCase))
{
PeerStatus status = (PeerStatus)Enum.Parse(typeof(PeerStatus), messagePayload, true);
peers[senderId].Status = status;
}
else
{
Task.Run(() =>
{
NewMessage?.Invoke(this, senderId, messageType, messagePayload);
});
}
}
}
}