internal static void PrepareOverlappedFakeContacts(Kademlia kademlia1, Kademlia kademlia2, int contacts)
{
for (int i = 0; i < contacts; i++)
{
var id = KademliaId.RandomId;
var ni = new NodeInformation(new IPEndPoint(IPAddress.Loopback, 12345), id);
RegisterFakeContact(kademlia1, ni);
}
for (int i = 0; i < contacts; i++)
{
var id = KademliaId.RandomId;
var ni = new NodeInformation(new IPEndPoint(IPAddress.Loopback, 12345), id);
RegisterFakeContact(kademlia2, ni);
}
for (int i = 0; i < contacts; i++)
{
var id = KademliaId.RandomId;
var ni = new NodeInformation(new IPEndPoint(IPAddress.Loopback, 12345), id);
RegisterFakeContact(kademlia1, ni);
RegisterFakeContact(kademlia2, ni);
}
}
internal void RemoveFromKademliaWhenRequestTimeout()
{
var id = KademliaId.RandomId;
var ni = new NodeInformation(new IPEndPoint(IPAddress.Loopback, 65432), id);
var message = new UdpMessage();
kademlia.HandleIncomingRequest(ni, message);
var response = new UdpMessage();
response.ResponseId = message.RequestId;
response.SenderNodeId = id;
message.ResponseCallback(response);
Assert.AreEqual(1, kademlia.CurrentContactCount);
// actual test
bool noResponse = false;
message = new UdpMessage();
message.PingRequest = new PingRequest();
message.ResponseCallback = udpMessage => Assert.Fail("The response callback should not be called in this test");
message.NoResponseCallback = () => noResponse = true;
node.SendUdpMessage(message, ni.EndPoint, id);
for (int i = 0; i < Node.TimeoutTicks; i++)
node.TimerElapsed();
Assert.AreEqual(1, kademlia.CurrentContactCount);
for (int i = 0; i < Node.TimeoutTicks; i++)
node.TimerElapsed();
Assert.IsTrue(noResponse, "The no-response callback should be called in this test");
Assert.AreEqual(0, kademlia.CurrentContactCount);
}
internal static void RegisterFakeContact(Kademlia kademlia, NodeInformation ni)
{
var message = new UdpMessage();
kademlia.HandleIncomingRequest(ni, message);
if (message.ResponseCallback == null)
return;
var response = new UdpMessage();
response.ResponseId = message.RequestId;
response.SenderNodeId = ni.NodeId;
message.ResponseCallback(response);
}
internal void PrepareKademlia()
{
node = new Node(null);
kademlia = node.Kademlia;
node2 = new Node(12345, null);
kademlia2 = node2.Kademlia;
targetId = node2.Id;
var ni = new NodeInformation(new IPEndPoint(IPAddress.Loopback, 12345), targetId);
TestHelper.RegisterFakeContact(kademlia, ni);
// set LastSeen to a time beyond the ping interval
var contact = Mirror.ForObject(kademlia)["FirstContact"].Invoke();
Mirror.ForObject(contact)["LastSeen"].Value = DateTime.Now - TimeSpan.FromHours(1.1);
}
internal void KademliaContactsAfterNewContact()
{
for (int i = 0; i < 10; i++)
{
var id = KademliaId.RandomId;
var ni = new NodeInformation(new IPEndPoint(i + 1, i + 1), id);
var message = new UdpMessage();
kademlia.HandleIncomingRequest(ni, message);
Assert.AreEqual(i, kademlia.CurrentContactCount);
Assert.IsNotNull(message.PingRequest);
var response = new UdpMessage();
response.ResponseId = message.RequestId;
response.SenderNodeId = id;
message.ResponseCallback(response);
Assert.AreEqual(i + 1, kademlia.CurrentContactCount);
}
}
internal void CreateNodes()
{
KyruTimer.Reset();
nodeA = new KyruApplication(12345).Node;
nodeB = new KyruApplication(12346).Node;
nodeC = new KyruApplication(12347).Node;
nodeAInfo = new NodeInformation(new IPEndPoint(IPAddress.Loopback, 12345), nodeA.Id);
nodeBInfo = new NodeInformation(new IPEndPoint(IPAddress.Loopback, 12346), nodeB.Id);
nodeCInfo = new NodeInformation(new IPEndPoint(IPAddress.Loopback, 12347), nodeC.Id);
nodeA.Start();
nodeB.Start();
nodeC.Start();
nodeA.Kademlia.AddNode(nodeBInfo.EndPoint);
nodeC.Kademlia.AddNode(nodeBInfo.EndPoint);
KyruTimer.Start();
Thread.Sleep(TestParameters.LocalhostCommunicationTimeout);
}
private bool Equals(NodeInformation other)
{
return Equals((KademliaId)NodeId, (KademliaId)other.NodeId) && IpAddress == other.IpAddress && Port == other.Port;
}
internal KnownNode(NodeInformation node)
{
Node = node;
LastSeen = DateTime.Now;
}
/// <returns>Whether the contact needs to be pinged.</returns>
private bool IsNewContact(NodeInformation contact)
{
if (node.Id == contact.NodeId)
return false;
var bucket = buckets[(node.Id - contact.NodeId).KademliaBucket()];
if (bucket.Count >= k)
{
// the bucket is full
return false;
}
return bucket.Find(n => n.Node == contact) == null;
}
private void AddContact(NodeInformation contact)
{
if (node.Id == contact.NodeId)
return;
var bucketIndex = (node.Id - contact.NodeId).KademliaBucket();
var bucket = buckets[bucketIndex];
var existingContact = bucket.FirstOrDefault(n => n.Node == contact);
if (existingContact == null)
{
if (bucket.Count >= k)
{
// the bucket is full
return;
}
//this.Log("Adding contact {0} ({1})", contact.NodeId, contact.EndPoint);
bucket.Add(new KnownNode(contact));
if (CurrentContactCount == 1)
{
// populate the contacts list
NodeLookup(node.Id, nodes =>
{
foreach (var n in nodes)
{
NodeLookup(n.NodeId, _ => { });
}
});
}
}
else
{
existingContact.LastSeen = DateTime.Now;
}
}
/// <summary>
/// Notifies Kademlia about incoming request messages, to maintain the contact list. If necessary, a ping request is added to the response message.
/// </summary>
/// <param name="sendingNode">The node that sent us a request.</param>
/// <param name="outgoingMessage">The message object that will be sent.</param>
internal void HandleIncomingRequest(NodeInformation sendingNode, UdpMessage outgoingMessage)
{
if (sendingNode.NodeId == node.Id)
return;
if (IsNewContact(sendingNode))
{
outgoingMessage.PingRequest = new PingRequest();
outgoingMessage.ResponseCallback = message => AddContact(new NodeInformation(sendingNode.EndPoint, message.SenderNodeId));
}
else
{
AddContact(sendingNode);
}
}
/// <summary>Processes an incoming FindNode request.</summary>
/// <param name="node">The sending node</param>
/// <param name="request">The message received from the sending node</param>
private void IncomingFindNode(NodeInformation node, UdpMessage request)
{
UdpMessage response = CreateUdpReply(request);
Kademlia.HandleIncomingRequest(node, response);
var contacts = Kademlia.NearestContactsTo(request.FindNodeRequest.NodeId, node.NodeId);
response.FindNodeResponse = new FindNodeResponse();
response.FindNodeResponse.Nodes = contacts.ToArray();
SendUdpMessage(response, node);
}
private void StoreTestObject()
{
// create the test object
objectId = KademliaId.RandomId;
var chunkId = KademliaId.RandomId;
var user = new User();
user.ObjectId = objectId;
var userFile = new UserFile();
userFile.ChunkList.Add(chunkId);
user.Add(userFile);
var ms = new MemoryStream();
Serializer.Serialize(ms, user);
bytes = ms.ToArray();
// store it
var ct = new CallbackTimeout<Error>();
var ni = new NodeInformation(new IPEndPoint(IPAddress.Loopback, nodes[1].Port), nodes[1].Id);
nodes[0].StoreObject(ni, objectId, bytes, ct.Done);
if (!ct.Block(TestParameters.LocalhostCommunicationTimeout))
{
Assert.Fail("No response within timeout");
}
Assert.AreEqual(Error.Success, ct.Result);
}
/// <summary>Processes an incoming FindValue request.</summary>
/// <param name="node">The sending node</param>
/// <param name="request">The message received from the sending node</param>
private void IncomingFindValue(NodeInformation node, UdpMessage request)
{
UdpMessage response = CreateUdpReply(request);
Kademlia.HandleIncomingRequest(node, response);
response.FindValueResponse = new FindValueResponse();
var metadata = MetadataStorage.Get(request.FindValueRequest.ObjectId);
if (metadata == null)
{
var contacts = Kademlia.NearestContactsTo(request.FindValueRequest.ObjectId, request.SenderNodeId);
response.FindValueResponse.Nodes = contacts.ToArray();
}
else
{
response.FindValueResponse.Data = metadata;
}
SendUdpMessage(response, node);
}
internal void StoreObject(NodeInformation targetNode, KademliaId objectId, byte[] bytes, Action<Error> done)
{
new Thread(new StoreObjectClient(app, targetNode, objectId, bytes, done).ThreadStart).Start();
}
/// <summary>Sends an UDP message to a given node.</summary>
/// <param name="message">The message to be sent.</param>
/// <param name="targetNode">The target node.</param>
private void SendUdpMessage(UdpMessage message, NodeInformation targetNode)
{
SendUdpMessage(message, targetNode.EndPoint, targetNode.NodeId);
}
private void OnUdpReceive(IAsyncResult ar)
{
if (!running)
{
return;
}
var endPoint = new IPEndPoint(IPAddress.Any, 0);
var data = udp.EndReceive(ar, ref endPoint);
UdpListen();
var ms = new MemoryStream(data);
var protocolVersion = ms.ReadByte();
if (protocolVersion != ProtocolVersion)
{
this.Warn("Ignoring message from {0} with unknown protocol version {1}", endPoint, protocolVersion);
return;
}
var incomingMessage = Serializer.Deserialize<UdpMessage>(ms);
if (!incomingMessage.Validate(endPoint))
return;
var ni = new NodeInformation(endPoint, incomingMessage.SenderNodeId);
if (incomingMessage.ResponseId != 0)
{
var identifier = new RequestIdentifier {EndPoint = ni.EndPoint, RequestId = incomingMessage.ResponseId};
lock (outstandingRequests)
{
if (!outstandingRequests.ContainsKey(identifier))
{
this.Warn("{2} from {0} has unknown response ID {1:X16}", endPoint, incomingMessage.ResponseId, incomingMessage.Inspect());
}
else
{
var request = outstandingRequests[identifier];
if (request.NodeId != null && request.NodeId != incomingMessage.SenderNodeId)
{
this.Warn("In {0}, node ID from {1} does not match (expected {2}, received {3})", incomingMessage.Inspect(), endPoint, request.NodeId, (KademliaId) incomingMessage.SenderNodeId);
}
else
{
outstandingRequests.Remove(identifier);
// the callback will deal with handling the actual response
request.OutgoingMessage.ResponseCallback(incomingMessage);
}
}
}
}
if (incomingMessage.PingRequest != null)
{
IncomingPing(ni, incomingMessage);
}
else if (incomingMessage.FindNodeRequest != null)
{
IncomingFindNode(ni, incomingMessage);
}
else if (incomingMessage.FindValueRequest != null)
{
IncomingFindValue(ni, incomingMessage);
}
else if (incomingMessage.StoreRequest != null)
{
IncomingStore(ni, incomingMessage);
}
else if (incomingMessage.KeepObjectRequest != null)
{
IncomingKeepObject(ni, incomingMessage);
}
}
/// <summary>Processes an incoming Store request.</summary>
/// <param name="node">The sending node</param>
/// <param name="request">The message received from the sending node</param>
private void IncomingStore(NodeInformation node, UdpMessage request)
{
UdpMessage response = CreateUdpReply(request);
Kademlia.HandleIncomingRequest(node, response);
MetadataStorage.Store(request.StoreRequest.ObjectId, request.StoreRequest.Data);
response.StoreResponse = new StoreResponse();
SendUdpMessage(response, node);
}
/// <summary>Processes an incoming Ping request.</summary>
/// <param name="node">The sending node</param>
/// <param name="request">The message received from the sending node</param>
private void IncomingPing(NodeInformation node, UdpMessage request)
{
UdpMessage response = CreateUdpReply(request);
Kademlia.HandleIncomingRequest(node, response);
SendUdpMessage(response, node);
}
/// <summary>Processes an incoming KeepObject request.</summary>
/// <param name="node">The sending node</param>
/// <param name="request">The message received from the sending node</param>
private void IncomingKeepObject(NodeInformation node, UdpMessage request)
{
UdpMessage response = CreateUdpReply(request);
Kademlia.HandleIncomingRequest(node, response);
response.KeepObjectResponse = new KeepObjectResponse();
response.KeepObjectResponse.HasObject = app.LocalObjectStorage.KeepObject(request.KeepObjectRequest.ObjectId);
SendUdpMessage(response, node);
}