private Task RunLoop(CancellationToken cancellationToken)
{
try
{
var stack = new CoinViewStack(this.coinView);
CachedCoinView cache = stack.Find <CachedCoinView>();
var stats = new ConsensusStats(stack, this.coinView, this.consensusLoop, this.chainState, this.chain, this.connectionManager, this.loggerFactory);
ChainedBlock lastTip = this.consensusLoop.Tip;
foreach (BlockResult block in this.consensusLoop.Execute(cancellationToken))
{
if (this.consensusLoop.Tip.FindFork(lastTip) != lastTip)
{
this.logger.LogInformation("Reorg detected, rewinding from '{0}' to '{1}'.", lastTip.HashBlock, this.consensusLoop.Tip);
}
lastTip = this.consensusLoop.Tip;
cancellationToken.ThrowIfCancellationRequested();
if (block.Error != null)
{
this.logger.LogError("Block rejected: {0}", block.Error.Message);
// Pull again.
this.consensusLoop.Puller.SetLocation(this.consensusLoop.Tip);
if (block.Error == ConsensusErrors.BadWitnessNonceSize)
{
this.logger.LogInformation("You probably need witness information, activating witness requirement for peers.");
this.connectionManager.AddDiscoveredNodesRequirement(NodeServices.NODE_WITNESS);
this.consensusLoop.Puller.RequestOptions(TransactionOptions.Witness);
continue;
}
// Set the PoW chain back to ConsensusLoop.Tip.
this.chain.SetTip(this.consensusLoop.Tip);
// Since ChainHeadersBehavior check PoW, MarkBlockInvalid can't be spammed.
this.logger.LogError("Marking block as invalid.");
this.chainState.MarkBlockInvalid(block.Block.GetHash());
}
if (block.Error == null)
{
this.chainState.HighestValidatedPoW = this.consensusLoop.Tip;
// We really want to flush if we are at the top of the chain.
// Otherwise, we just allow the flush to happen if it is needed.
bool forceFlush = this.chain.Tip.HashBlock == block.ChainedBlock?.HashBlock;
this.consensusLoop.FlushAsync(forceFlush).GetAwaiter().GetResult();
this.signals.SignalBlock(block.Block);
}
// TODO: Replace this with a signalling object.
if (stats.CanLog)
{
stats.Log();
}
}
}
catch (Exception ex)
{
if (ex is OperationCanceledException)
{
if (this.nodeLifetime.ApplicationStopping.IsCancellationRequested)
{
return(Task.FromException(ex));
}
}
// TODO Need to revisit unhandled exceptions in a way that any process can signal an exception has been
// thrown so that the node and all the disposables can stop gracefully.
this.logger.LogDebug("Exception occurred in consensus loop: {0}", ex.ToString());
this.logger.LogCritical(new EventId(0), ex, "Consensus loop at Tip:{0} unhandled exception {1}", this.consensusLoop.Tip?.Height, ex.ToString());
NLog.LogManager.Flush();
throw;
}
return(Task.CompletedTask);
}
private void RunLoop()
{
try
{
var stack = new CoinViewStack(this.coinView);
var cache = stack.Find <CachedCoinView>();
var stats = new ConsensusStats(stack, this.coinView, this.consensusLoop, this.chainState, this.chain, this.connectionManager, this.loggerFactory);
var cancellationToken = this.nodeLifetime.ApplicationStopping;
ChainedBlock lastTip = this.consensusLoop.Tip;
foreach (var block in this.consensusLoop.Execute(cancellationToken))
{
if (this.consensusLoop.Tip.FindFork(lastTip) != lastTip)
{
this.logger.LogInformation("Reorg detected, rewinding from " + lastTip.Height + " (" + lastTip.HashBlock + ") to " + this.consensusLoop.Tip.Height + " (" + this.consensusLoop.Tip.HashBlock + ")");
}
lastTip = this.consensusLoop.Tip;
cancellationToken.ThrowIfCancellationRequested();
if (block.Error != null)
{
this.logger.LogError("Block rejected: " + block.Error.Message);
//Pull again
this.consensusLoop.Puller.SetLocation(this.consensusLoop.Tip);
if (block.Error == ConsensusErrors.BadWitnessNonceSize)
{
this.logger.LogInformation("You probably need witness information, activating witness requirement for peers.");
this.connectionManager.AddDiscoveredNodesRequirement(NodeServices.NODE_WITNESS);
this.consensusLoop.Puller.RequestOptions(TransactionOptions.Witness);
continue;
}
//Set the PoW chain back to ConsensusLoop.Tip
this.chain.SetTip(this.consensusLoop.Tip);
//Since ChainHeadersBehavior check PoW, MarkBlockInvalid can't be spammed
this.logger.LogError("Marking block as invalid");
this.chainState.MarkBlockInvalid(block.Block.GetHash());
}
if (block.Error == null)
{
this.chainState.HighestValidatedPoW = this.consensusLoop.Tip;
if (this.chain.Tip.HashBlock == block.ChainedBlock?.HashBlock)
{
this.consensusLoop.FlushAsync();
}
this.signals.SignalBlock(block.Block);
}
// TODO: replace this with a signalling object
if (stats.CanLog)
{
stats.Log();
}
}
}
catch (Exception ex)
{
if (ex is OperationCanceledException)
{
if (this.nodeLifetime.ApplicationStopping.IsCancellationRequested)
{
return;
}
}
// TODO Need to revisit unhandled exceptions in a way that any process can signal an exception has been
// thrown so that the node and all the disposables can stop gracefully.
this.logger.LogCritical(new EventId(0), ex, "Consensus loop unhandled exception (Tip:" + this.consensusLoop.Tip?.Height + ")");
throw;
}
}
