private async Task ConnectToPeers(IEnumerable <KeyValuePair <string, ServiceFlags> > hosts) // PASS THE SERVICE_FLAGS.
{
if (hosts == null)
{
throw new ArgumentNullException(nameof(hosts));
}
var tasks = new List <Task>();
foreach (var kvp in hosts)
{
var ip = IPAddress.Parse(kvp.Key);
var myIp = PeersStore.Instance().GetMyIpAddress();
if (myIp.Ipv6.SequenceEqual(ip.MapToIPv6().GetAddressBytes())) // NOT SAME ADDRESS.
{
continue;
}
if (ContainsPeer(ip.MapToIPv6().GetAddressBytes())) // CONNECTION DOESNT EXIST.
{
continue;
}
tasks.Add(ConnectToPeer(kvp.Key, kvp.Value));
}
var result = Task.WhenAll(tasks.ToArray());
await result;
}
public byte[] Serialize()
{
var result = new List <byte>();
result.AddRange(MessageHeader.GetStartString());
var commandName = GetCommandName();
List <byte> commandNameBuffer = System.Text.Encoding.ASCII.GetBytes(commandName).ToList();
for (var i = commandNameBuffer.Count(); i < 12; i++)
{
commandNameBuffer.Add(0x00);
}
result.AddRange(commandNameBuffer);
result.AddRange(PeersStore.Instance().GetMyIpAddress().Ipv6);
var content = GetSerializedContent();
var size = BitConverter.GetBytes(content.Length);
result.AddRange(size);
byte[] checksum = null;
if (content == null)
{
checksum = new byte[] { 0x5d, 0xf6, 0xe0, 0xe2 };
}
else
{
SHA256 mySHA256 = SHA256.Create();
var hashed = mySHA256.ComputeHash(mySHA256.ComputeHash(content));
checksum = hashed.Take(4).ToArray();
}
result.AddRange(checksum);
result.AddRange(content);
return(result.ToArray());
}
public async Task Listen(Networks network, bool keepConnectionsAlive = true)
{
_network = network;
var instance = PeersStore.Instance();
var currentIpAddress = instance.GetMyIpAddress();
_isSeedNode = IsSeedNode(currentIpAddress, _network);
await DiscoverNodes();
}
public void Connect(string host, ServiceFlags serviceFlag)
{
if (string.IsNullOrWhiteSpace(host))
{
throw new ArgumentNullException(nameof(host));
}
var iid = Interop.Constants.InterfaceId;
var port = PortsHelper.GetPort(_network);
IPAddress ipAdr = null;
if (!IPAddress.TryParse(host, out ipAdr))
{
// TODO : Throw an exception.
}
var adrBytes = ipAdr.MapToIPv6().GetAddressBytes();
_serviceFlag = serviceFlag;
_currentIpAddress = new IpAddress(serviceFlag, adrBytes, ushort.Parse(port));
// _client = new RpcClientApi(iid, RpcProtseq.ncacn_ip_tcp, host, port);
_client = new RpcClientApi(iid, RpcProtseq.ncalrpc, null, host);
// Connection to peers : https://bitcoin.org/en/developer-guide#connecting-to-peers
var instance = PeersStore.Instance();
var transmittingNode = instance.GetMyIpAddress();
var nonce = NonceHelper.GetNonceUInt64();
var versionMessage = new VersionMessage(transmittingNode, _currentIpAddress, nonce, string.Empty, 0, false, _network);
try
{
_peerConnection = new PeerConnection(adrBytes);
var result = _messageCoordinator.Launch(this, versionMessage);
if (result != null && result is VerackMessage)
{
_peerConnection.Connect();
if (ConnectEvent != null)
{
ConnectEvent(this, new IpAddressEventArgs(_currentIpAddress));
}
_timer = new Timer(TimerElapsed, _autoEvent, CHECK_INTERVAL, CHECK_INTERVAL); // CHECK PEERS AVAILABILITY EVERY 60 SECONDS.
}
}
catch (Interop.RpcException)
{
throw new PeerConnectorException(ErrorCodes.PeerRpcError);
}
}
public void Start(IEnumerable <byte> ipAddress = null)
{
if (ipAddress == null)
{
ipAddress = _ipAdrHelper.GetIpv4Address();
}
_ipAddress = new IpAddress(DateTime.UtcNow, _serviceFlag, ipAddress.ToArray(), ushort.Parse(PortsHelper.GetPort(_network)));
PeersStore.Instance().SetMyIpAddress(_ipAddress);
var iid = Interop.Constants.InterfaceId;
var instance = PeersStore.Instance();
var port = PortsHelper.GetPort(_network);
// _server = new RpcServerApi(iid, 1234, -1, true);
// _server.AddProtocol(RpcProtseq.ncacn_ip_tcp, port, 5);
var name = (new IPAddress(_ipAddress.Ipv6)).MapToIPv4().ToString(); // USE QUEUE.
_server = new RpcServerApi(iid, 1234, -1, true);
_server.AddProtocol(RpcProtseq.ncalrpc, name, 5);
_server.StartListening();
_server.OnExecute += delegate(IRpcClientInfo client, byte[] arg)
{
var message = _messageParser.Parse(arg);
var connectedPeer = _p2pNetworkConnector.GetPeer(message.MessageHeader.Ipv6);
if (NewMessageEvent != null)
{
NewMessageEvent(this, new StringEventArgs(message.GetCommandName()));
}
var response = _messageCoordinator.Receive(message, connectedPeer, _p2pNetworkConnector);
if (response == null)
{
return(new byte[0]);
}
return(response.Serialize());
};
if (StartNodeEvent != null)
{
StartNodeEvent(this, EventArgs.Empty);
}
}
private async Task DiscoverNodesViaSeeds()
{
var dic = GetSeedNodes(_network).Select(s => new KeyValuePair <string, ServiceFlags>(s, ServiceFlags.NODE_NETWORK));
await ConnectToPeers(dic);
var instance = PeersStore.Instance();
var currentIpAddress = instance.GetMyIpAddress();
var addrMessage = new AddrMessage(new CompactSize {
Size = 1
}, _network);
addrMessage.IpAddresses.Add(currentIpAddress);
Broadcast(addrMessage);
var getAddrMessage = new GetAddressMessage(_network);
var getAddrLst = Broadcast(getAddrMessage);
if (getAddrLst != null && getAddrLst.Any())
{
foreach (var getAddr in getAddrLst)
{
var getAdrMsg = getAddr as AddrMessage;
if (getAdrMsg == null)
{
continue;
}
_peersRepository.AddPeers(getAdrMsg.IpAddresses);
}
}
var peers = _peersRepository.GetAll();
if (peers.Any())
{
await DiscoverNodesViaStore(peers);
}
}
public Message Receive(Message message, PeerConnector peer, P2PNetworkConnector p2pNetworkConnector)
{
var blockChain = _blockChainStore.GetBlockChain();
var smartContract = _smartContractStore.GetSmartContracts();
if (message.GetCommandName() == Constants.MessageNames.Version) // RETURNS VERSION.
{
var msg = message as VersionMessage;
var instance = PeersStore.Instance();
var transmittingNode = instance.GetMyIpAddress();
var receivingNode = msg.TransmittingNode;
return(new VersionMessage(transmittingNode, receivingNode, msg.Nonce, msg.UserAgent, msg.StartHeight, msg.Relay, msg.MessageHeader.Network));
}
if (message.GetCommandName() == Constants.MessageNames.Ping) // RETURNS PONG.
{
var msg = message as PingMessage;
var pong = new PongMessage(msg.Nonce, msg.MessageHeader.Network);
return(pong);
}
if (message.GetCommandName() == Constants.MessageNames.Verack) // RETURNS VERACK MESSAGE.
{
var msg = message as VerackMessage;
return(new VerackMessage(msg.MessageHeader.Network));
}
if (message.GetCommandName() == Constants.MessageNames.Addr) // RETURNS THE ADDRS.
{
var msg = message as AddrMessage;
if (msg.IpAddresses != null)
{
foreach (var ipAddress in msg.IpAddresses)
{
PeerEventStore.Instance().NewPeer(ipAddress);
}
}
return(null);
}
if (message.GetCommandName() == Constants.MessageNames.GetAddr) // RETURNS THE ADDRS.
{
var msg = message as GetAddressMessage;
var ipAdrLst = _peersStorage.GetAll();
var response = new AddrMessage(new CompactSize {
Size = (ulong)ipAdrLst.Count()
}, msg.MessageHeader.Network);
foreach (var ipAdr in ipAdrLst)
{
response.IpAddresses.Add(ipAdr);
}
return(response);
}
if (message.GetCommandName() == Constants.MessageNames.MemPool) // RETURNS THE INVENTORY.
{
var msg = message as MemPoolMessage;
var memoryPool = MemoryPool.Instance();
var txIds = memoryPool.GetTransactions().Select(t => t.Transaction.GetTxId());
var inventories = new List <Inventory>();
foreach (var txId in txIds)
{
inventories.Add(new Inventory(InventoryTypes.MSG_TX, txId));
}
return(new InventoryMessage(inventories, msg.MessageHeader.Network));
}
if (message.GetCommandName() == Constants.MessageNames.GetData) // RETURNS ALL THE DATA TO THE PEER.
{
var msg = message as GetDataMessage;
var messages = Execute(msg);
if (messages != null)
{
foreach (var m in messages)
{
peer.Execute(m.Serialize());
}
}
return(null);
}
if (message.GetCommandName() == Constants.MessageNames.Transaction) // ADD TRANSACTION INTO MEMORY POOL & BROADCAST IT.
{
var msg = message as TransactionMessage;
AddTransaction(msg.Transaction);
MemoryPool.Instance().Remove(msg.Transaction);
p2pNetworkConnector.Broadcast(msg.Transaction, msg.MessageHeader.Ipv6);
return(null);
}
if (message.GetCommandName() == Constants.MessageNames.Block) // ADD THE BLOCK.
{
var msg = message as BlockMessage;
_blockValidator.Check(msg.Block);
if (msg.Block.Transactions != null)
{
MemoryPool.Instance().Remove(msg.Block.Transactions.Select(tx => tx.GetTxId()));
}
smartContract.AddBlock(msg.Block);
smartContract.Commit();
blockChain.AddBlock(msg.Block);
}
if (message.GetCommandName() == Constants.MessageNames.NotFound) // SOME INVENTORIES ARE NOT FOUND.
{
return(null);
}
if (message.GetCommandName() == Constants.MessageNames.GetBlocks) // RETURN THE BLOCKS : https://bitcoin.org/en/developer-reference#getblocks
{
var msg = message as GetBlocksMessage;
int lastBlockHeight = -1;
foreach (var blockHash in msg.BlockHashes)
{
lastBlockHeight = blockChain.GetBlockHeight(blockHash);
if (lastBlockHeight != -1)
{
goto Found;
}
}
Found:
var currentBlockHeight = blockChain.GetCurrentBlockHeight();
if (currentBlockHeight == lastBlockHeight)
{
return(new InventoryMessage(new List <Inventory>(), msg.MessageHeader.Network));
}
var nbBlocks = currentBlockHeight - lastBlockHeight;
if (lastBlockHeight == -1)
{
nbBlocks = currentBlockHeight - 1;
}
if (nbBlocks > Constants.DEFAULT_MAX_GET_INVENTORIES)
{
nbBlocks = Constants.DEFAULT_MAX_GET_INVENTORIES;
}
var blocks = blockChain.GetLastBlocks(nbBlocks);
var inventories = new List <Inventory>();
foreach (var block in blocks)
{
inventories.Add(new Inventory(InventoryTypes.MSG_BLOCK, block.GetHashHeader()));
}
return(new InventoryMessage(inventories, msg.MessageHeader.Network));
}
return(null);
}
