public void Init <T>(BitcoinNode <T> node, BitcoinPeer peer, Guid id) where T : PeerHandler, new()
{
Node = node as BitcoinNode <BitcoinNodePeer>;
Id = id;
Peer = peer;
Peer.OnMessage += Peer_OnMessage;
Peer.OnStopping += Peer_OnStopping;
Peer.Start();
}
private async Task Peer_OnMessage(BitcoinPeer s, IStreamable msg)
{
switch (msg)
{
case Addr a:
{
foreach (var ip in a.Ips)
{
var ep = new IPEndPoint(ip.Ip.MapToIPv6(), ip.Port);
var epb = ep.ToByteArray();
if (!await db.SetContainsAsync("hs:nodes:good-nodes", epb) && !await db.SetContainsAsync("hs:nodes:bad-nodes", epb))
{
QueueNewNode(ep);
}
}
break;
}
case Ping a:
{
var pong = new Pong();
pong.Nonce = a.Nonce;
await s.WriteMessage(pong);
break;
}
case bitcoin_lib.P2P.Version a:
{
GotVersion = true;
//send verack and log
await SetNodeDetails(a);
var va = new VerAck();
await s.WriteMessage(va);
var ga = new GetAddr();
await s.WriteMessage(ga);
break;
}
}
}
public async Task Connect()
{
try
{
var ns = new Socket(SocketType.Stream, ProtocolType.Tcp);
#if NET461
var sem_conn_net461 = new SemaphoreSlim(1);
var sca = new SocketAsyncEventArgs();
if (ns.ConnectAsync(sca))
{
await sem_conn_net461.WaitAsync();
}
#else
await ns.ConnectAsync(IP);
#endif
Peer = new BitcoinPeer(ChainParams, ns);
Peer.OnMessage += Peer_OnMessage;
Peer.Start();
Ver.Timestamp = (UInt64)DateTimeOffset.Now.ToUnixTimeSeconds();
await Peer.WriteMessage(Ver);
//disconnect after 5s
await Task.Factory.StartNew(async() =>
{
await Task.Delay(TimeSpan.FromSeconds(5));
if (!GotVersion)
{
await SetAsBadNode();
}
Close();
});
}
catch (Exception ex)
{
//Console.WriteLine($"Connection failed {ex.Message}, setting as bad node.");
await SetAsBadNode();
}
}
private async Task Peer_OnMessage(BitcoinPeer s, IStreamable msg)
{
switch (msg)
{
case bitcoin_lib.P2P.Version a:
{
PeerVersion = a;
if (Peer.IsInbound)
{
await SendVersion();
}
var va = new VerAck();
await s.WriteMessage(va);
if (Peer.IsInbound && PeerVersion.HighestVersion >= 70014)
{
//send cmpct (i only want my version, i dont care about another version)
//no version 1 msg will be sent if version 2 is supported
var nVersion = (Peer.ChainParams.Services & (ulong)Services.NODE_WITNESS) != 0 ? 2ul : 1ul;
var cmp = new SendCMPCT();
cmp.Version = nVersion;
cmp.Enabled = true;
await s.WriteMessage(cmp);
}
if (BlockChain.Mempool.Count == 0)
{
//ask for mempool
var mp = new MemPool();
await s.WriteMessage(mp);
}
var ph = ((IPEndPoint)Peer.RemoteEndpoint).AsHash();
if (BlockChain.Peers.ContainsKey(ph))
{
//update peer info
BlockChain.Peers[ph].LastSeen = DateTime.Now;
BlockChain.Peers[ph].LastVersion = a;
}
else
{
//ask the peer for addr info if this is the first time we seen them
var ga = new GetAddr();
await s.WriteMessage(ga);
}
break;
}
case Inv a:
{
var gd = new GetData();
var to_get = new List <Inventory>();
var sw = new Stopwatch();
sw.Start();
to_get.AddRange(a.Inventory.Where(b => b.Type == InventoryType.MSG_TX && !BlockChain.Mempool.ContainsKey(b.Hash)));
if ((PeerVersion.Services & (ulong)Services.NODE_WITNESS) == 1)
{
to_get.ForEach(b => b.Type = InventoryType.MSG_WITNESS_TX);
}
gd.Inventory = to_get.ToArray();
if (gd.Inventory.Length > 0)
{
//Console.WriteLine($"Asking for {gd.Count} tnxs, {sw.Elapsed.TotalMilliseconds.ToString("0.00")}ms");
await s.WriteMessage(gd);
}
break;
}
case Tx a:
{
if (!BlockChain.Mempool.ContainsKey(a.Hash))
{
BlockChain.Mempool.Add(a.Hash, a);
}
break;
}
case VerAck a:
{
if (Peer.IsInbound)
{
await SendAddr();
}
await s.WriteMessage(new Ping());
break;
}
case Addr a:
{
foreach (var ip in a.Ips)
{
var ph = new IPEndPoint(ip.Ip, ip.Port).AsHash();
if (!BlockChain.Peers.ContainsKey(ph))
{
BlockChain.Peers.Add(ph, new PeerInfo()
{
Ip = Peer.RemoteEndpoint,
LastSeen = DateTime.Now,
LastVersion = new bitcoin_lib.P2P.Version() //add empty version
});
}
}
break;
}
case Pong a:
{
if (PingTimer.IsRunning)
{
PingTimer.Stop();
}
//Console.WriteLine($"[{RemoteEndpoint}]{PeerVersion.UserAgent} ping is: {LastPing.TotalMilliseconds.ToString("0.00")}ms");
break;
}
case Ping a:
{
var pong = new Pong();
pong.Nonce = a.Nonce;
await s.WriteMessage(pong);
break;
}
case MemPool a:
{
var inv = new Inv();
inv.Inventory = BlockChain.Mempool.Keys.Select(b => new Inventory()
{
Type = InventoryType.MSG_TX,
Hash = b
}).ToArray();
if (inv.Inventory.Length > 0)
{
await s.WriteMessage(inv);
}
break;
}
case SendCMPCT a:
{
if (CMPCTBlockVersion == 0 && a.Enabled && a.Version <= 2)
{
if (Peer.IsInbound)
{
//lock in cmpct
var nVersion = (Peer.ChainParams.Services & (ulong)Services.NODE_WITNESS) != 0 ? 2ul : 1ul;
if (a.Version == nVersion)
{
CMPCTBlockVersion = a.Version;
Console.WriteLine($"Locking version {a.Version} cmpct block");
}
}
else
{
//reply to cmpct negotiation, if the node advertises witness use version 2
var nVersion = (PeerVersion.Services & (ulong)Services.NODE_WITNESS) != 0 ? 2ul : 1ul;
if (a.Version == nVersion)
{
CMPCTBlockVersion = a.Version;
}
else if (nVersion != a.Version && CMPCTBlockVersion == 0) //if they only sent version 1 & they advertise NODE_WITNESS, use this version
{
CMPCTBlockVersion = a.Version;
}
var rsp = new SendCMPCT();
rsp.Version = CMPCTBlockVersion;
rsp.Enabled = true;
Console.WriteLine($"Sending version {rsp.Version} cmpct block");
await s.WriteMessage(rsp);
}
Console.WriteLine($"Peer is asking for version {a.Version} cmpct block");
}
break;
}
}
}
public async Task UpdateNodeInfo(Node n)
{
//Console.WriteLine($"Update node info: {n.IP}");
try
{
//try to connect to the node to get version info and to get its peers
var ns = new Socket(SocketType.Stream, ProtocolType.Tcp);
await ns.ConnectAsync(n.IP);
var p = new BitcoinPeer(ns);
//Console.WriteLine($"Connected to {n.IP}");
var ss = new SemaphoreSlim(0, 1);
var db = Redis.GetDatabase();
p.OnVersion += async(s, v) =>
{
//send verack and log
var ip = new IPEndPoint(((IPEndPoint)s.RemoteEndpoint).Address.MapToIPv6(), ((IPEndPoint)s.RemoteEndpoint).Port);
var ipb = ip.ToByteArray();
await db.HashSetAsync($"hs:nodes:detail:{ip.ToString()}", "version", v.ToArray());
if (await db.SortedSetAddAsync("hs:nodes:all-nodes", ipb, DateTime.Now.Ticks))
{
//Console.WriteLine($"Got new node: {ip}");
await db.SetRemoveAsync("hs:nodes:new-nodes", ipb);
var gloc = GeoIp.City(ip.Address);
if (gloc.Location.HasCoordinates)
{
await db.GeoAddAsync("hs:nodes:geo", new GeoEntry(gloc.Location.Longitude.Value, gloc.Location.Latitude.Value, ipb));
}
}
var va = new VerAck();
await s.WriteMessage(va);
var ga = new GetAddr();
await s.WriteMessage(ga);
};
p.OnAddr += async(s, a) =>
{
//Console.WriteLine($"Got {a.IpCount.Value} ips");
foreach (var ip in a.Ips)
{
var ep = new IPEndPoint(ip.Ip.MapToIPv6(), ip.Port);
var epb = ep.ToByteArray();
if (await db.SetAddAsync("hs:nodes:new-nodes", epb))
{
//Console.WriteLine($"Got new node: {ep}");
}
}
s.Stop();
ss.Release();
//Console.WriteLine($"Disconnected from {n.IP}");
};
p.Start();
Ver.Timestamp = (UInt64)DateTimeOffset.Now.ToUnixTimeSeconds();
await p.WriteMessage(Ver);
await ss.WaitAsync(TimeSpan.FromSeconds(5));
}
catch (Exception ex)
{
//Console.WriteLine(ex);
}
}
