public async void Run()
{
IsRunning = true;
await Task.Run(async() =>
{
while (IsRunning)
{
try
{
string response = await conn.WaitForResponse();
Tuple <string[], PacketType> packet = packetHandler.HandlePacket(response);
switch (packet.Item2)
{
case PacketType.Status:
StatusReceived?.Invoke(new StatusArgs(packet.Item1[1]));
break;
case PacketType.SyncData:
SyncDataReceived?.Invoke(new SyncDataArgs(packet.Item1));
break;
case PacketType.Heart:
HeartReceived?.Invoke(new HeartArgs(packet.Item1[1]));
break;
case PacketType.ClientDisconnect:
ClientDisconnectReceived?.Invoke(new EventArgs());
break;
case PacketType.Broadcast:
BroadcastReceived?.Invoke(new BroadcastArgs(packet.Item1[1]));
break;
case PacketType.Message:
MessageReceived?.Invoke(new MessageArgs(packet.Item1[1]));
break;
}
}
catch (Exception e)
{
IsRunning = false;
}
}
});
}
public override void OnReceive(Context context, Intent intent)
{
BroadcastReceived?.Invoke(context, intent);
}
/// <summary>
///
/// </summary>
public async Task ReceiveBroadcast(CancellationToken token)
{
UdpClient client = null;
Task t = null;
try
{
client = new UdpClient(10080);
var t1 = Task.Run(() =>
{
while (true)
{
var remoteEndPoint = default(IPEndPoint);
var bytes = client.Receive(ref remoteEndPoint);
if (bytes.Length == 2 && bytes[0] == 0xcc && bytes[1] == 0xdd)
{
BroadcastReceived?.Invoke(remoteEndPoint.Address.ToString());
}
}
});
var t2 = Task.Run(() =>
{
var count = 0;
while (true)
{
if (count > 30)
{
break;
}
count++;
if (token.IsCancellationRequested)
{
client.Close();
return;
}
Thread.Sleep(500);
}
client.Close();
});
t = Task.WhenAll(t1, t2);
await t;
}
catch
{
if (t != null)
{
throw t.Exception;
}
throw;
}
finally
{
if (client != null)
{
client.Close();
}
}
}
private async Task SynchronizeRemoteToLocalAsync()
{
DebugPrint("Enter Remote to Local");
var have = await ChannelsExtensions.ReadAsync(haveChannel).ConfigureAwait(false);
DebugPrint("Have is {0}", have.MerkleRootHash);
var isRemoteRootSyncedLocally = await IsRemoteObjectHeldLocally(have.MerkleRootHash).ConfigureAwait(false);
DebugPrint("IRRSL {0}", isRemoteRootSyncedLocally);
if (!isRemoteRootSyncedLocally)
{
var nodesToImport = new List <Tuple <string, MerkleNode> >();
var neededHashes = new LinkedList <string>();
neededHashes.AddLast(have.MerkleRootHash);
while (neededHashes.Count != 0)
{
var hashesReadLocally = new HashSet <string>();
foreach (var hash in neededHashes)
{
var localNode = await localMerkleTree.GetNodeAsync(hash).ConfigureAwait(false);
if (localNode != null)
{
nodesToImport.Add(Tuple.Create(hash, localNode));
hashesReadLocally.Add(hash);
continue;
}
var need = new NeedPacket {
MerkleRootHash = hash
};
DebugPrint("SEND NEED {0}", need.MerkleRootHash);
neighbor.SendAsync(serializer.ToByteArray(need)).Forget();
}
Console.WriteLine($"Found {neededHashes.Count} messages to sync");
foreach (var i in Enumerable.Range(0, neededHashes.Count))
{
var hash = neededHashes.First();
neededHashes.RemoveFirst();
if (hashesReadLocally.Contains(hash))
{
continue;
}
var give = await ChannelsExtensions.ReadAsync(giveChannel).ConfigureAwait(false);
Console.WriteLine($"Got hash {give.NodeHash}");
nodesToImport.Add(Tuple.Create(give.NodeHash, give.Node));
if (!await IsRemoteObjectHeldLocally(give.Node.LeftHash).ConfigureAwait(false))
{
neededHashes.AddLast(give.Node.LeftHash);
}
if (!await IsRemoteObjectHeldLocally(give.Node.RightHash).ConfigureAwait(false))
{
neededHashes.AddLast(give.Node.RightHash);
}
}
}
var broadcastMessagesByNodeHash = nodesToImport.Where(n => n.Item2.TypeTag == MerkleNodeTypeTag.Data)
.ToDictionary(
n => n.Item1,
n => broadcastMessageSerializer.Deserialize(n.Item2.Contents)
);
Console.WriteLine($"Need to add {broadcastMessagesByNodeHash.Count} hashes that we don't have");
var neededSourceIdHashes = broadcastMessagesByNodeHash.Select(kvp => kvp.Value.SourceIdHash)
.GroupBy(sourceIdHash => sourceIdHash.ToHexString())
.Select(g => new { Bytes = g.First(), Hex = g.Key })
.Where(pair => !IdentityManager.IsKnownIdentity(pair.Bytes))
.ToList();
foreach (var neededSourceId in neededSourceIdHashes)
{
var whois = new WhoisPacket {
IdHash = neededSourceId.Bytes
};
DebugPrint("SEND WHOIS {0}", neededSourceId.Hex);
neighbor.SendAsync(serializer.ToByteArray(whois)).Forget();
}
foreach (var i in Enumerable.Range(0, neededSourceIdHashes.Count))
{
var ident = await ChannelsExtensions.ReadAsync(identChannel).ConfigureAwait(false);
Identity.ValidateAndAdd(ident.TrustChain);
}
foreach (var neededSourceId in neededSourceIdHashes)
{
if (!IdentityManager.IsKnownIdentity(neededSourceId.Bytes))
{
throw new InvalidStateException();
}
}
foreach (var tuple in nodesToImport)
{
var node = tuple.Item2;
if (node.Descendents == 0 && await localMerkleTree.GetNodeAsync(tuple.Item1).ConfigureAwait(false) == null)
{
var isDataNode = node.TypeTag == MerkleNodeTypeTag.Data;
BroadcastMessageDto message = isDataNode ? broadcastMessageSerializer.Deserialize(node.Contents) : null;
var sender = IdentityManager.LookupIdentity(message.SourceIdHash);
if (message.DestinationIdHash.All(val => val == 0))
{
if ((sender.HeldPermissions & Permission.Broadcast) == 0)
{
Console.WriteLine("Sender does not have broadcast permissions. Malicious peer!");
throw new InvalidStateException();
}
}
else
{
if ((sender.HeldPermissions & Permission.Unicast) == 0)
{
Console.WriteLine("Sender does not have unicast permissions. Malicious peer!");
throw new InvalidStateException();
}
}
}
}
await remoteMerkleTree.ImportAsync(have.MerkleRootHash, nodesToImport).ConfigureAwait(false);
Console.WriteLine($"Currently have {nodesToImport.Count} nodes to import still");
foreach (var tuple in nodesToImport)
{
var node = tuple.Item2;
if (node.Descendents == 0 && await localMerkleTree.GetNodeAsync(tuple.Item1).ConfigureAwait(false) == null)
{
var isDataNode = node.TypeTag == MerkleNodeTypeTag.Data;
BroadcastMessageDto message = isDataNode ? broadcastMessageSerializer.Deserialize(node.Contents) : null;
Console.WriteLine("Got data node");
var insertionResult = await localMerkleTree.TryInsertAsync(tuple.Item2).ConfigureAwait(false);
if (insertionResult.Item1 && isDataNode)
{
byte[] decryptedPayload;
Console.WriteLine("Got a message");
if (identity.TryDecodePayload(message, out decryptedPayload))
{
BroadcastReceived?.Invoke(new MessageReceivedEventArgs(neighbor, new BroadcastMessage {
SourceId = IdentityHash.GetFlyweight(message.SourceIdHash),
DestinationId = IdentityHash.GetFlyweight(message.DestinationIdHash),
DecryptedPayload = decryptedPayload,
Dto = message
}));
}
}
}
}
}
DebugPrint("SEND DONE");
await neighbor.SendAsync(serializer.ToByteArray(new DonePacket())).ConfigureAwait(false);
}
