/// <summary>Rewinds the connected part of invalid chain.</summary>
private async Task RewindPartiallyConnectedChainAsync(ChainedHeader lastValidatedBlockHeader, ChainedHeader currentTip)
{
this.logger.LogTrace("({0}:'{1}',{2}:'{3}'", nameof(lastValidatedBlockHeader), lastValidatedBlockHeader, nameof(currentTip), currentTip);
ChainedHeader current = lastValidatedBlockHeader;
while (currentTip.Height < current.Height)
{
RewindState transitionState = await this.consensusRules.RewindAsync().ConfigureAwait(false);
lock (this.peerLock)
{
current = this.chainedHeaderTree.GetChainedHeader(transitionState.BlockHash);
}
}
if (currentTip.Height != current.Height)
{
// The rewind operation must return to the same fork point.
this.logger.LogError("The rewind operation ended up at '{0}' instead of fork point '{1}'.", currentTip, current);
this.logger.LogTrace("(-)[INVALID_REWIND]");
throw new ConsensusException("The rewind operation must return to the same fork point.");
}
this.logger.LogTrace("(-)");
}
/// <summary>Rewinds to fork point or below it.</summary>
/// <returns>New consensus tip.</returns>
private async Task <ChainedHeader> RewindToForkPointOrBelowAsync(ChainedHeader fork, ChainedHeader oldTip)
{
this.logger.LogTrace("({0}:'{1}',{2}:'{3}'", nameof(fork), fork, nameof(oldTip), oldTip);
ChainedHeader currentTip = oldTip;
while (fork.Height < currentTip.Height)
{
RewindState transitionState = await this.consensusRules.RewindAsync().ConfigureAwait(false);
lock (this.peerLock)
{
currentTip = this.chainedHeaderTree.GetChainedHeader(transitionState.BlockHash);
}
}
this.logger.LogTrace("(-):'{0}'", currentTip);
return(currentTip);
}
/// <inheritdoc />
/// <remarks>
/// If <see cref="blockStore"/> is not <c>null</c> (block store is available) then all block headers in
/// <see cref="chainedHeaderTree"/> will be marked as their block data is available.
/// If store is not available the <see cref="ConsensusManager"/> won't be able to serve blocks from disk,
/// instead all block requests that are not in memory will be sent to the <see cref="blockPuller"/>.
/// </remarks>
public async Task InitializeAsync(ChainedHeader chainTip)
{
this.logger.LogTrace("({0}:'{1}')", nameof(chainTip), chainTip);
// TODO: consensus store
// We should consider creating a consensus store class that will internally contain
// coinview and it will abstract the methods `RewindAsync()` `GetBlockHashAsync()`
uint256 consensusTipHash = await this.consensusRules.GetBlockHashAsync().ConfigureAwait(false);
while (true)
{
this.Tip = chainTip.FindAncestorOrSelf(consensusTipHash);
if (this.Tip?.HashBlock == consensusTipHash)
{
break;
}
// In case block store initialized behind, rewind until or before the block store tip.
// The node will complete loading before connecting to peers so the chain will never know if a reorg happened.
RewindState transitionState = await this.consensusRules.RewindAsync().ConfigureAwait(false);
consensusTipHash = transitionState.BlockHash;
}
this.chainState.ConsensusTip = this.Tip;
this.chainedHeaderTree.Initialize(this.Tip, this.blockStore != null);
this.blockPuller.Initialize();
this.isIbd = this.ibdState.IsInitialBlockDownload();
this.blockPuller.OnIbdStateChanged(this.isIbd);
this.logger.LogTrace("(-)");
}