public PeerId[] NearestPeers(DhtId id, int count)
{
var cpl = DhtId.CommonPrefixLength(id, _local);
lock (_tabLock)
{
if (cpl >= Buckets.Length)
{
cpl = Buckets.Length - 1;
}
var bucket = Buckets[cpl];
var peers = Util.CopyPeersFromList(id, bucket.Peers);
if (peers.Count() < count)
{
if (cpl > 0)
{
var plist = Buckets[cpl - 1].Peers;
peers = Util.CopyPeersFromList(id, plist);
}
if (cpl < Buckets.Length - 1)
{
var plist = Buckets[cpl + 1].Peers;
peers = Util.CopyPeersFromList(id, plist);
}
}
return(peers.OrderBy(p => p.Distance, new Util.DistanceComparer())
.Take(count)
.Select(p => p.P).ToArray());
}
}
public Bucket Split(int cpl, DhtId target)
{
_rwlock.EnterWriteLock();
try
{
var output = new List <PeerId>();
var newBuck = new Bucket(output);
foreach (var e in _list)
{
var peerId = DhtId.ConvertPeerId(e);
var peerCpl = DhtId.CommonPrefixLength(peerId, target);
if (peerCpl > cpl)
{
output.Add(e);
}
}
_list.RemoveAll(output.Contains);
return(newBuck);
}
finally
{
_rwlock.ExitWriteLock();
}
}
public void Remove(PeerId p)
{
lock (_tabLock)
{
var peerId = DhtId.ConvertPeerId(p);
var cpl = DhtId.CommonPrefixLength(peerId, _local);
var bucketId = cpl;
if (bucketId >= Buckets.Length)
{
bucketId = Buckets.Length - 1;
}
var bucket = Buckets[bucketId];
bucket.Remove(p);
}
}
public void Update(PeerId p)
{
var peerId = DhtId.ConvertPeerId(p);
var cpl = DhtId.CommonPrefixLength(peerId, _local);
lock (_tabLock)
{
var bucketId = cpl;
if (bucketId >= Buckets.Length)
{
bucketId = Buckets.Length - 1;
}
var bucket = Buckets[bucketId];
if (bucket.Has(p))
{
bucket.MoveToFront(p);
return;
}
if (_metrics.LatencyEWMA(p) > _maxLatency)
{
return;
}
bucket.PushFront(p);
if (bucket.Length > _bucketSize)
{
if (bucketId == Buckets.Length - 1)
{
NextBucket();
}
else
{
bucket.PopBack();
}
}
}
}
