public void CheckContactHealth(DhtClient dhtClient)
{
_lock.TryEnterReadLock(LOCK_TIMEOUT);
try
{
if (_contacts == null)
{
_leftBucket.CheckContactHealth(dhtClient);
_rightBucket.CheckContactHealth(dhtClient);
}
else
{
foreach (NodeContact contact in _contacts.Values)
{
if (contact.IsStale())
{
ThreadPool.QueueUserWorkItem(CheckContactHealthAsync, new object[] { dhtClient, contact });
}
}
}
}
finally
{
_lock.ExitReadLock();
}
}
private void CheckContactHealthAsync(object state)
{
object[] param = state as object[];
DhtClient dhtClient = param[0] as DhtClient;
NodeContact contact = param[1] as NodeContact;
int retries = 0;
do
{
try
{
if (dhtClient.Ping(contact))
{
return; //contact replied; do nothing.
}
}
catch
{ }
retries++;
}while (retries < HEALTH_PING_MAX_RETRIES);
try
{
//remove stale node
RemoveContactFromCurrentBucket(contact);
}
catch
{ }
}
private void RefreshBucketAsync(object state)
{
try
{
DhtClient dhtClient = state as DhtClient;
//get random node ID in the bucket range
BinaryID randomNodeID = (BinaryID.GenerateRandomID160() << _bucketDepth) | _bucketID;
//find closest contacts for current node id
NodeContact[] initialContacts = GetKClosestContacts(randomNodeID);
if (initialContacts.Length > 0)
{
dhtClient.QueryFindNode(initialContacts, randomNodeID); //query manager auto add contacts that respond
}
}
catch
{ }
}
public void RefreshBucket(DhtClient dhtClient)
{
_lock.TryEnterReadLock(LOCK_TIMEOUT);
try
{
if (_contacts == null)
{
_leftBucket.RefreshBucket(dhtClient);
_rightBucket.RefreshBucket(dhtClient);
}
else
{
if ((DateTime.UtcNow - _lastChanged).TotalSeconds > BUCKET_STALE_TIMEOUT_SECONDS)
{
ThreadPool.QueueUserWorkItem(RefreshBucketAsync, dhtClient);
}
}
}
finally
{
_lock.ExitReadLock();
}
}