private void SearchNodes(DHTId searchInfoHash)
{
fLogger.WriteDebug("Search for: {0}", searchInfoHash.ToString());
fSearchInfoHash = searchInfoHash;
new Thread(() => {
while (Connected)
{
long nowTicks = DateTime.UtcNow.Ticks;
int count = 0;
lock (fRoutingTable) {
// if the routing table has not been updated for more
// than a minute - reset routing table
if (nowTicks - fLastNodesUpdateTime > NODES_UPDATE_TIME)
{
fRoutingTable.Clear();
fLogger.WriteDebug("DHT reset routing table");
}
count = fRoutingTable.Count;
}
if (count == 0)
{
// reboot if empty
foreach (var t in fRouters)
{
SendFindNodeQuery(new IPEndPoint(t, PublicDHTPort), null);
}
}
else
{
// search
// bucket = 32 - significantly increases the speed and reliability of peers discovery
var nodes = fRoutingTable.GetClosest(fSearchInfoHash.Data, 32);
#if DEBUG_DHT_INTERNALS
fLogger.WriteDebug("RoutingTable size: {0}", fRoutingTable.Count);
fLogger.WriteDebug("Closest list size: {0}", nodes.Count);
#endif
foreach (var node in nodes)
{
if (nowTicks - node.LastGetPeersTime > GetPeersRange.Ticks)
{
SendGetPeersQuery(node.EndPoint, fSearchInfoHash);
node.LastGetPeersTime = nowTicks;
}
}
}
RefreshRoutingTable();
Thread.Sleep(1000);
}
}).Start();
}
private void OnRecvGetPeersQuery(IPEndPoint ipinfo, BDictionary data)
{
var t = data.Get <BString>("t");
var args = data.Get <BDictionary>("a");
var id = args.Get <BString>("id");
var infoHash = new DHTId(args.Get <BString>("info_hash"));
var remoteNode = new DHTNode(id.Value, ipinfo);
UpdateRoutingTable(remoteNode);
#if DEBUG_DHT_INTERNALS
fLogger.WriteDebug("Receive `get_peers` query from {0} for {1}", remoteNode.ToString(), infoHash.ToString());
#endif
var neighbor = DHTNode.GetNeighbor(infoHash.Data, fLocalID.Data);
var peersList = (infoHash == fSearchInfoHash) ? fPeersHolder.GetPeersList() : null;
var nodesList = fRoutingTable.GetClosest(infoHash.Data);
Send(ipinfo, DHTMessage.CreateGetPeersResponse(t, neighbor, infoHash, peersList, nodesList));
}
private void OnRecvAnnouncePeerQuery(IPEndPoint ipinfo, BDictionary data)
{
var t = data.Get <BString>("t");
var args = data.Get <BDictionary>("a");
var id = args.Get <BString>("id");
var infoHash = new DHTId(args.Get <BString>("info_hash"));
var impliedPort = args.Get <BNumber>("implied_port");
int port = (impliedPort != null && impliedPort.Value == 1) ? ipinfo.Port : (int)args.Get <BNumber>("port").Value;
var remoteNode = new DHTNode(id.Value, ipinfo);
UpdateRoutingTable(remoteNode);
#if DEBUG_DHT_INTERNALS
fLogger.WriteDebug("Receive `announce_peer` query from {0} for {1}", remoteNode.ToString(), infoHash.ToString());
#endif
// skip response for another infohash query
if (infoHash == fSearchInfoHash)
{
// receive `announce_peer` query for our infohash
var nodesList = fRoutingTable.GetClosest(infoHash.Data);
Send(ipinfo, DHTMessage.CreateAnnouncePeerResponse(t, fLocalID, nodesList));
if (PeersFound != null)
{
PeersFound(this, new PeersFoundEventArgs(new List <IPEndPoint>()
{
ipinfo
}));
}
}
}
