/// <summary>
/// Ask the next peer the question.
/// </summary>
async Task AskAsync(int taskId)
{
int pass = 0;
int waits = 20;
while (!runningQuery.IsCancellationRequested && waits > 0)
{
// Get the nearest peer that has not been visited.
var peer = Dht.RoutingTable
.NearestPeers(QueryKey)
.Where(p => !visited.Contains(p))
.FirstOrDefault();
if (peer == null)
{
--waits;
await Task.Delay(100);
continue;
}
++pass;
visited.Add(peer);
// Ask the nearest peer.
await askCount.WaitAsync(runningQuery.Token).ConfigureAwait(false);
var start = DateTime.Now;
log.Debug($"Q{Id}.{taskId}.{pass} ask {peer}");
try
{
using (var timeout = new CancellationTokenSource(askTime))
using (var cts = CancellationTokenSource.CreateLinkedTokenSource(timeout.Token, runningQuery.Token))
using (var stream = await Dht.Swarm.DialAsync(peer, Dht.ToString(), cts.Token).ConfigureAwait(false))
{
// Send the KAD query and get a response.
ProtoBuf.Serializer.SerializeWithLengthPrefix(stream, queryMessage, PrefixStyle.Base128);
await stream.FlushAsync(cts.Token).ConfigureAwait(false);
var response = await ProtoBufHelper.ReadMessageAsync <DhtMessage>(stream, cts.Token).ConfigureAwait(false);
// Process answer
ProcessProviders(response.ProviderPeers);
ProcessCloserPeers(response.CloserPeers);
}
var time = DateTime.Now - start;
log.Debug($"Q{Id}.{taskId}.{pass} ok {peer} ({time.TotalMilliseconds} ms)");
}
catch (Exception e)
{
Interlocked.Increment(ref failedConnects);
var time = DateTime.Now - start;
log.Warn($"Q{Id}.{taskId}.{pass} failed ({time.TotalMilliseconds} ms) - {e.Message}");
// eat it
}
finally
{
askCount.Release();
}
}
}
/// <summary>
/// Ask the next peer the question.
/// </summary>
async Task AskAsync(int taskId)
{
int pass = 0;
while (!runningQuery.IsCancellationRequested)
{
++pass;
// Get the nearest peer that has not been visited.
var peer = Dht.RoutingTable
.NearestPeers(QueryKey)
.Where(p => !visited.Contains(p))
.FirstOrDefault();
if (peer == null)
{
return;
}
visited.Add(peer);
// Ask the nearest peer.
try
{
await askCount.WaitAsync(runningQuery.Token);
log.Debug($"Q{Id}.{taskId}.{pass} ask {peer}");
using (var timeout = new CancellationTokenSource(askTime))
using (var cts = CancellationTokenSource.CreateLinkedTokenSource(timeout.Token, runningQuery.Token))
using (var stream = await Dht.Swarm.DialAsync(peer, Dht.ToString(), cts.Token))
{
// Send the KAD query and get a response.
ProtoBuf.Serializer.SerializeWithLengthPrefix(stream, queryMessage, PrefixStyle.Base128);
await stream.FlushAsync(cts.Token);
var response = await ProtoBufHelper.ReadMessageAsync <DhtMessage>(stream, cts.Token);
// Process answer
ProcessProviders(response.ProviderPeers);
ProcessCloserPeers(response.CloserPeers);
}
}
catch (Exception e)
{
log.Warn($"Q{Id}.{taskId}.{pass} ask failed {e.Message}");
// eat it
}
finally
{
askCount.Release();
}
}
}