private Peer AddPeer(PeerTable table, string addr, PeerOrigin peerOrigin, DateTimeOffset now)
{
var peer = new Peer(peerOrigin, new NetworkAddress()
{
Endpoint = new IPEndPoint(IPAddress.Parse(addr), 100),
Time = now
});
table.WritePeer(peer);
return peer;
}
public void CanStorePeers()
{
PeerTable table = new PeerTable();
table.Randomize = false;
AssertPeer(table, "1.0.0.0", p => Assert.Null(p));
AddPeer(table, "1.0.0.0", PeerOrigin.Addr, DateTimeOffset.Now);
AssertPeer(table, "1.0.0.0", p => Assert.NotNull(p));
Assert.True(table.GetActivePeers(10).Length == 1);
AssertPeer(table, "1.0.0.1", p => Assert.Null(p));
AddPeer(table, "1.0.0.1", PeerOrigin.Addr, DateTimeOffset.Now - TimeSpan.FromHours(4.0));
AssertPeer(table, "1.0.0.1", p => Assert.Null(p));
//Second peer should be expired
Assert.True(table.GetActivePeers(10).Length == 1);
AddPeer(table, "1.0.0.1", PeerOrigin.Addr, DateTimeOffset.Now - TimeSpan.FromHours(2.0));
Assert.True(table.GetActivePeers(10).Length == 2);
Assert.True(table.GetActivePeers(1).Length == 1);
AddPeer(table, "1.0.0.2", PeerOrigin.DNSSeed, DateTimeOffset.Now);
var peers = table.GetActivePeers(10);
Assert.Equal(CreateEndpoint("1.0.0.0"), peers[0].NetworkAddress.Endpoint); //Most recent
Assert.Equal(CreateEndpoint("1.0.0.1"), peers[1].NetworkAddress.Endpoint);
Assert.Equal(CreateEndpoint("1.0.0.2"), peers[2].NetworkAddress.Endpoint); //Seeds
Assert.Equal(2, table.CountUsed());
//Can add two time a seed
AddPeer(table, "1.0.0.2", PeerOrigin.DNSSeed, DateTimeOffset.Now);
AddPeer(table, "1.0.0.1", PeerOrigin.Addr, DateTimeOffset.Now - TimeSpan.FromHours(4.0));
peers = table.GetActivePeers(10);
Assert.Equal(CreateEndpoint("1.0.0.0"), peers[0].NetworkAddress.Endpoint); //Most recent
//Assert.Equal(CreateEndpoint("1.0.0.1"), peers[1].NetworkAddress.Endpoint); Expired
Assert.Equal(CreateEndpoint("1.0.0.2"), peers[1].NetworkAddress.Endpoint); //Seeds
Assert.Equal(1, table.CountUsed()); //Seed does not count
Assert.Equal(2, table.CountUsed(false)); //Seed count
var p1 = AddPeer(table, "1.0.0.4", PeerOrigin.DNSSeed, DateTimeOffset.Now - TimeSpan.FromHours(4.0));
Assert.Equal(3, table.CountUsed(false)); //Expired seeds should still appear
table.RemovePeer(p1);
Assert.Equal(2, table.CountUsed(false)); //Removed
}
public NodeSet CreateNodeSet(int size)
{
if (size > 1000)
{
throw new ArgumentOutOfRangeException("size", "size should be less than 1000");
}
TraceCorrelation trace = new TraceCorrelation(NodeServerTrace.Trace, "Creating node set of size " + size);
NodeSet set = new NodeSet();
using (trace.Open())
{
while (set.Count() < size)
{
var peerToGet = size - set.Count();
var activePeers = PeerTable.GetActivePeers(1000);
activePeers = activePeers.Where(p => !set.Contains(p.NetworkAddress.Endpoint)).ToArray();
if (activePeers.Length < peerToGet)
{
DiscoverPeers(size);
continue;
}
NodeServerTrace.Information("Need " + peerToGet + " more nodes");
BlockingCollection <Node> handshakedNodes = new BlockingCollection <Node>(peerToGet);
CancellationTokenSource handshakedFull = new CancellationTokenSource();
try
{
Parallel.ForEach(activePeers,
new ParallelOptions()
{
MaxDegreeOfParallelism = 10,
CancellationToken = handshakedFull.Token
}, p =>
{
if (set.Contains(p.NetworkAddress.Endpoint))
{
return;
}
Node node = null;
try
{
node = GetNodeByPeer(p, handshakedFull.Token);
node.VersionHandshake(handshakedFull.Token);
if (node != null && node.State != NodeState.HandShaked)
{
node.Disconnect();
}
if (!handshakedNodes.TryAdd(node))
{
handshakedFull.Cancel();
node.Disconnect();
}
else
{
var remaining = (size - set.Count() - handshakedNodes.Count);
if (remaining == 0)
{
handshakedFull.Cancel();
}
else
{
NodeServerTrace.Information("Need " + remaining + " more nodes");
}
}
}
catch (Exception)
{
if (node != null)
{
node.Disconnect();
}
}
});
}
catch (OperationCanceledException)
{
}
set.AddNodes(handshakedNodes.ToArray());
}
}
return(set);
}
int CountPeerRequired(int peerToFind)
{
return(Math.Max(0, peerToFind - PeerTable.CountUsed(true)));
}
/// <summary>
/// Fill the PeerTable with fresh addresses
/// </summary>
public void DiscoverPeers(int peerToFind = 990)
{
TraceCorrelation traceCorrelation = new TraceCorrelation(NodeServerTrace.Trace, "Discovering nodes");
List <Task> tasks = new List <Task>();
using (traceCorrelation.Open())
{
while (CountPeerRequired(peerToFind) != 0)
{
NodeServerTrace.PeerTableRemainingPeerToGet(CountPeerRequired(peerToFind));
var peers = PeerTable.GetActivePeers(1000);
if (peers.Length == 0)
{
PopulateTableWithDNSNodes();
PopulateTableWithHardNodes();
peers = PeerTable.GetActivePeers(1000);
}
CancellationTokenSource peerTableFull = new CancellationTokenSource();
NodeSet connected = new NodeSet();
try
{
Parallel.ForEach(peers, new ParallelOptions()
{
MaxDegreeOfParallelism = 5,
CancellationToken = peerTableFull.Token,
}, p =>
{
CancellationTokenSource cancellation = new CancellationTokenSource(TimeSpan.FromSeconds(40));
Node n = null;
try
{
n = GetNodeByPeer(p, cancellation.Token);
if (n.State < NodeState.HandShaked)
{
connected.AddNode(n);
n.VersionHandshake(cancellation.Token);
}
n.SendMessage(new GetAddrPayload());
Thread.Sleep(2000);
}
catch (Exception)
{
if (n != null)
{
n.Disconnect();
}
}
if (CountPeerRequired(peerToFind) == 0)
{
peerTableFull.Cancel();
}
else
{
NodeServerTrace.Information("Need " + CountPeerRequired(peerToFind) + " more peers");
}
});
}
catch (OperationCanceledException)
{
}
finally
{
connected.DisconnectAll();
}
}
NodeServerTrace.Trace.TraceInformation("Peer table is now full");
}
}
private void AssertPeer(PeerTable table, string peer, Action<Peer> test)
{
test(table.GetPeer(new IPEndPoint(IPAddress.Parse(peer), 100)));
}