public bool IsSynchingCore(GetBlockchainInfoResponse blockchainInfo)
{
if (blockchainInfo.InitialBlockDownload == true)
return true;
if (blockchainInfo.MedianTime.HasValue && _Network.NBitcoinNetwork.NetworkType != NetworkType.Regtest)
{
var time = NBitcoin.Utils.UnixTimeToDateTime(blockchainInfo.MedianTime.Value);
// 5 month diff? probably synching...
if (DateTimeOffset.UtcNow - time > TimeSpan.FromDays(30 * 5))
{
return true;
}
}
return blockchainInfo.Headers - blockchainInfo.Blocks > 6;
}
async Task <bool> StepAsync(CancellationToken token)
{
var oldState = State;
switch (State)
{
case BitcoinDWaiterState.NotStarted:
await RPCArgs.TestRPCAsync(_Network, _RPCWithTimeout, token);
_OriginalRPC.Capabilities = _RPCWithTimeout.Capabilities;
GetBlockchainInfoResponse blockchainInfo = null;
try
{
blockchainInfo = await _RPCWithTimeout.GetBlockchainInfoAsyncEx();
if (_Network.CryptoCode == "BTC" &&
_Network.NBitcoinNetwork.NetworkType == NetworkType.Mainnet &&
!_BanListLoaded)
{
if (await LoadBanList())
{
_BanListLoaded = true;
}
}
if (blockchainInfo != null && _Network.NBitcoinNetwork.NetworkType == NetworkType.Regtest)
{
if (await WarmupBlockchain())
{
blockchainInfo = await _RPCWithTimeout.GetBlockchainInfoAsyncEx();
}
}
}
catch (Exception ex)
{
Logs.Configuration.LogError(ex, $"{_Network.CryptoCode}: Failed to connect to RPC");
break;
}
if (IsSynchingCore(blockchainInfo))
{
State = BitcoinDWaiterState.CoreSynching;
}
else
{
await ConnectToBitcoinD(token);
State = BitcoinDWaiterState.NBXplorerSynching;
}
break;
case BitcoinDWaiterState.CoreSynching:
GetBlockchainInfoResponse blockchainInfo2 = null;
try
{
blockchainInfo2 = await _RPCWithTimeout.GetBlockchainInfoAsyncEx();
}
catch (Exception ex)
{
Logs.Configuration.LogError(ex, $"{_Network.CryptoCode}: Failed to connect to RPC");
State = BitcoinDWaiterState.NotStarted;
break;
}
if (!IsSynchingCore(blockchainInfo2))
{
await ConnectToBitcoinD(token);
State = BitcoinDWaiterState.NBXplorerSynching;
}
break;
case BitcoinDWaiterState.NBXplorerSynching:
var explorer = GetExplorerBehavior();
if (explorer == null)
{
State = BitcoinDWaiterState.NotStarted;
}
else if (!explorer.IsSynching())
{
State = BitcoinDWaiterState.Ready;
}
break;
case BitcoinDWaiterState.Ready:
var explorer2 = GetExplorerBehavior();
if (explorer2 == null)
{
State = BitcoinDWaiterState.NotStarted;
}
else if (explorer2.IsSynching())
{
State = BitcoinDWaiterState.NBXplorerSynching;
}
break;
default:
break;
}
var changed = oldState != State;
if (changed)
{
if (oldState == BitcoinDWaiterState.NotStarted)
{
NetworkInfo = await _RPCWithTimeout.GetNetworkInfoAsync();
}
_EventAggregator.Publish(new BitcoinDStateChangedEvent(_Network, oldState, State));
if (State == BitcoinDWaiterState.Ready)
{
await File.WriteAllTextAsync(RPCReadyFile, NBitcoin.Utils.DateTimeToUnixTime(DateTimeOffset.UtcNow).ToString());
}
}
if (State != BitcoinDWaiterState.Ready)
{
EnsureRPCReadyFileDeleted();
}
return(changed);
}
async Task <bool> StepAsync(CancellationToken token)
{
var oldState = State;
switch (State)
{
case BitcoinDWaiterState.NotStarted:
await RPCArgs.TestRPCAsync(_Network, _RPC, token);
GetBlockchainInfoResponse blockchainInfo = null;
try
{
blockchainInfo = await _RPC.GetBlockchainInfoAsyncEx();
if (blockchainInfo != null && _Network.NBitcoinNetwork.NetworkType == NetworkType.Regtest)
{
if (await WarmupBlockchain())
{
blockchainInfo = await _RPC.GetBlockchainInfoAsyncEx();
}
}
}
catch (Exception ex)
{
Logs.Configuration.LogError(ex, $"{_Network.CryptoCode}: Failed to connect to RPC");
break;
}
if (IsSynchingCore(blockchainInfo))
{
State = BitcoinDWaiterState.CoreSynching;
}
else
{
await ConnectToBitcoinD(token);
State = BitcoinDWaiterState.NBXplorerSynching;
}
break;
case BitcoinDWaiterState.CoreSynching:
GetBlockchainInfoResponse blockchainInfo2 = null;
try
{
blockchainInfo2 = await _RPC.GetBlockchainInfoAsyncEx();
}
catch (Exception ex)
{
Logs.Configuration.LogError(ex, $"{_Network.CryptoCode}: Failed to connect to RPC");
State = BitcoinDWaiterState.NotStarted;
break;
}
if (!IsSynchingCore(blockchainInfo2))
{
await ConnectToBitcoinD(token);
State = BitcoinDWaiterState.NBXplorerSynching;
}
break;
case BitcoinDWaiterState.NBXplorerSynching:
var explorer = _Group?.ConnectedNodes.SelectMany(n => n.Behaviors.OfType <ExplorerBehavior>()).FirstOrDefault();
if (explorer == null)
{
GetBlockchainInfoResponse blockchainInfo3 = null;
try
{
blockchainInfo3 = await _RPC.GetBlockchainInfoAsyncEx();
}
catch (Exception ex)
{
Logs.Configuration.LogError(ex, $"{_Network.CryptoCode}: Failed to connect to RPC");
State = BitcoinDWaiterState.NotStarted;
break;
}
if (IsSynchingCore(blockchainInfo3))
{
State = BitcoinDWaiterState.CoreSynching;
}
}
else if (!explorer.IsSynching())
{
State = BitcoinDWaiterState.Ready;
}
break;
case BitcoinDWaiterState.Ready:
var explorer2 = _Group?.ConnectedNodes.SelectMany(n => n.Behaviors.OfType <ExplorerBehavior>()).FirstOrDefault();
if (explorer2 == null)
{
State = BitcoinDWaiterState.NotStarted;
}
else if (explorer2.IsSynching())
{
State = BitcoinDWaiterState.NBXplorerSynching;
}
break;
default:
break;
}
var changed = oldState != State;
if (changed)
{
_EventAggregator.Publish(new BitcoinDStateChangedEvent(_Network, oldState, State));
}
return(changed);
}
private async Task ConnectToBitcoinD(CancellationToken cancellation, GetBlockchainInfoResponse blockchainInfo)
{
var node = GetHandshakedNode();
if (node != null)
{
return;
}
try
{
EnsureNodeDisposed();
_Chain.ResetToGenesis();
_Chain.SetCapacity((int)(blockchainInfo.Headers * 1.1));
if (_Configuration.CacheChain)
{
LoadChainFromCache();
if (!await HasBlock(_OriginalRPC, _Chain.Tip))
{
Logs.Configuration.LogInformation($"{_Network.CryptoCode}: The cached chain contains a tip unknown to the node, dropping the cache...");
_Chain.ResetToGenesis();
}
}
var heightBefore = _Chain.Height;
using (var timeout = CancellationTokenSource.CreateLinkedTokenSource(cancellation))
{
timeout.CancelAfter(_Network.ChainLoadingTimeout);
Logs.Configuration.LogInformation($"{_Network.CryptoCode}: Trying to connect via the P2P protocol to trusted node ({_ChainConfiguration.NodeEndpoint.ToEndpointString()})...");
var userAgent = "NBXplorer-" + RandomUtils.GetInt64();
bool handshaked = false;
bool connected = false;
bool chainLoaded = false;
using (var handshakeTimeout = CancellationTokenSource.CreateLinkedTokenSource(cancellation))
{
try
{
handshakeTimeout.CancelAfter(TimeSpan.FromSeconds(10));
node = await Node.ConnectAsync(_Network.NBitcoinNetwork, _ChainConfiguration.NodeEndpoint, new NodeConnectionParameters()
{
UserAgent = userAgent,
ConnectCancellation = handshakeTimeout.Token,
IsRelay = true
});
connected = true;
Logs.Explorer.LogInformation($"{Network.CryptoCode}: TCP Connection succeed, handshaking...");
node.VersionHandshake(handshakeTimeout.Token);
handshaked = true;
Logs.Explorer.LogInformation($"{Network.CryptoCode}: Handshaked");
var loadChainTimeout = _Network.NBitcoinNetwork.ChainName == ChainName.Regtest ? TimeSpan.FromSeconds(5) : _Network.ChainCacheLoadingTimeout;
if (_Chain.Height < 5)
{
loadChainTimeout = TimeSpan.FromDays(7); // unlimited
}
Logs.Configuration.LogInformation($"{_Network.CryptoCode}: Loading chain from node");
try
{
using (var cts1 = CancellationTokenSource.CreateLinkedTokenSource(cancellation))
{
cts1.CancelAfter(loadChainTimeout);
Logs.Explorer.LogInformation($"{Network.CryptoCode}: Loading chain...");
node.SynchronizeSlimChain(_Chain, cancellationToken: cts1.Token);
}
}
catch when(!cancellation.IsCancellationRequested) // Timeout happens with SynchronizeChain, if so, throw away the cached chain
{
Logs.Explorer.LogInformation($"{Network.CryptoCode}: Failed to load chain before timeout, let's try again without the chain cache...");
_Chain.ResetToGenesis();
node.SynchronizeSlimChain(_Chain, cancellationToken: cancellation);
}
Logs.Explorer.LogInformation($"{Network.CryptoCode}: Chain loaded");
chainLoaded = true;
var peer = (await _OriginalRPC.GetPeersInfoAsync())
.FirstOrDefault(p => p.SubVersion == userAgent);
if (IsWhitelisted(peer))
{
Logs.Explorer.LogInformation($"{Network.CryptoCode}: NBXplorer is correctly whitelisted by the node");
}
else
{
var addressStr = peer.Address is IPEndPoint end?end.Address.ToString() : peer.Address?.ToString();
Logs.Explorer.LogWarning($"{Network.CryptoCode}: Your NBXplorer server is not whitelisted by your node," +
$" you should add \"whitelist={addressStr}\" to the configuration file of your node. (Or use whitebind)");
}
}
catch
{
if (!connected)
{
Logs.Explorer.LogWarning($"{Network.CryptoCode}: NBXplorer failed to connect to the node via P2P ({_ChainConfiguration.NodeEndpoint.ToEndpointString()}).{Environment.NewLine}" +
$"It may come from: A firewall blocking the traffic, incorrect IP or port, or your node may not have an available connection slot. {Environment.NewLine}" +
$"To make sure your node have an available connection slot, use \"whitebind\" or \"whitelist\" in your node configuration. (typically whitelist=127.0.0.1 if NBXplorer and the node are on the same machine.){Environment.NewLine}");
}
else if (!handshaked)
{
Logs.Explorer.LogWarning($"{Network.CryptoCode}: NBXplorer connected to the remote node but failed to handhsake via P2P.{Environment.NewLine}" +
$"Your node may not have an available connection slot, or you may try to connect to the wrong node. (ie, trying to connect to a LTC node on the BTC configuration).{Environment.NewLine}" +
$"To make sure your node have an available connection slot, use \"whitebind\" or \"whitelist\" in your node configuration. (typically whitelist=127.0.0.1 if NBXplorer and the node are on the same machine.){Environment.NewLine}");
}
else if (!chainLoaded)
{
Logs.Explorer.LogWarning($"{Network.CryptoCode}: NBXplorer connected and handshaked the remote node but failed to load the chain of header.{Environment.NewLine}" +
$"Your connection may be throttled, or you may try to connect to the wrong node. (ie, trying to connect to a LTC node on the BTC configuration).{Environment.NewLine}");
}
throw;
}
}
}
Logs.Configuration.LogInformation($"{_Network.CryptoCode}: Height: " + _Chain.Height);
if (_Configuration.CacheChain && heightBefore != _Chain.Height)
{
SaveChainInCache();
}
GC.Collect();
node.Behaviors.Add(new SlimChainBehavior(_Chain));
var explorer = (ExplorerBehavior)_ExplorerPrototype.Clone();
node.Behaviors.Add(explorer);
node.StateChanged += Node_StateChanged;
_Node = node;
}
catch
{
EnsureNodeDisposed(node ?? _Node);
throw;
}
}