public void UniqueId()
{
var q1 = new DistributedQuery <Peer>();
var q2 = new DistributedQuery <Peer>();
Assert.AreNotEqual(q1.Id, q2.Id);
}
/// <inheritdoc />
public async Task <Peer> FindPeerAsync(MultiHash id, CancellationToken cancel = default(CancellationToken))
{
// Can always find self.
if (Swarm.LocalPeer.Id == id)
{
return(Swarm.LocalPeer);
}
// Maybe the swarm knows about it.
var found = Swarm.KnownPeers.FirstOrDefault(p => p.Id == id);
if (found != null && found.Addresses.Count() > 0)
{
return(found);
}
// Ask our peers for information on the requested peer.
var dquery = new DistributedQuery <Peer>
{
QueryType = MessageType.FindNode,
QueryKey = id,
Dht = this,
AnswersNeeded = 1
};
await dquery.RunAsync(cancel).ConfigureAwait(false);
// If not found, return the closest peer.
if (dquery.Answers.Count() == 0)
{
return(RoutingTable.NearestPeers(id).FirstOrDefault());
}
return(dquery.Answers.First());
}
/// <inheritdoc />
public async Task <Peer> FindPeerAsync(MultiHash id, CancellationToken cancel = default(CancellationToken))
{
// Can always find self.
if (Swarm.LocalPeer.Id == id)
{
return(Swarm.LocalPeer);
}
// Maybe the swarm knows about it.
var found = Swarm.KnownPeers.FirstOrDefault(p => p.Id == id);
if (found != null && found.Addresses.Count() > 0)
{
return(found);
}
// Ask our peers for information on the requested peer.
var dquery = new DistributedQuery <Peer>
{
QueryType = MessageType.FindNode,
QueryKey = id,
Dht = this,
AnswersNeeded = 1
};
await dquery.RunAsync(cancel);
if (dquery.Answers.Count == 0)
{
throw new KeyNotFoundException($"Cannot locate peer '{id}'.");
}
return(dquery.Answers.First());
}
public async Task Cancelling()
{
var dquery = new DistributedQuery <Peer>();
var cts = new CancellationTokenSource();
cts.Cancel();
await dquery.RunAsync(cts.Token);
Assert.AreEqual(0, dquery.Answers.Count);
}
/// <inheritdoc />
public async Task <IEnumerable <Peer> > FindProvidersAsync(
Cid id,
int limit = 20,
Action <Peer> action = null,
CancellationToken cancel = default(CancellationToken))
{
var dquery = new DistributedQuery <Peer>
{
QueryType = MessageType.GetProviders,
QueryKey = id.Hash,
Dht = this,
AnswersNeeded = limit,
};
if (action != null)
{
dquery.AnswerObtained += (s, e) => action.Invoke(e);
}
// Add any providers that we already know about.
var providers = ContentRouter
.Get(id)
.Select(pid =>
{
return((pid == Swarm.LocalPeer.Id)
? Swarm.LocalPeer
: Swarm.RegisterPeer(new Peer {
Id = pid
}));
});
foreach (var provider in providers)
{
dquery.AddAnswer(provider);
}
// Ask our peers for more providers.
if (limit > dquery.Answers.Count())
{
await dquery.RunAsync(cancel).ConfigureAwait(false);
}
return(dquery.Answers.Take(limit));
}
/// <inheritdoc />
public async Task <IEnumerable <Peer> > FindProvidersAsync(
Cid id,
int limit = 20,
Action <Peer> action = null,
CancellationToken cancel = default(CancellationToken))
{
var dquery = new DistributedQuery <Peer>
{
QueryType = MessageType.GetProviders,
QueryKey = id.Hash,
Dht = this,
AnswersNeeded = limit,
};
if (action != null)
{
dquery.AnswerObtained += (s, e) => action.Invoke(e);
}
await dquery.RunAsync(cancel);
return(dquery.Answers.Take(limit));
}
