private async Task ConsumeBlockCandidates(
TimeSpan timeout,
CancellationToken cancellationToken)
{
var checkInterval = TimeSpan.FromMilliseconds(10);
while (!cancellationToken.IsCancellationRequested)
{
if (BlockCandidateTable.Any())
{
BlockHeader tipHeader = BlockChain.Tip.Header;
SortedList <long, Block <T> > blocks =
BlockCandidateTable.GetCurrentRoundCandidate(tipHeader);
if (!(blocks is null))
{
var latest = blocks.Last();
_logger.Debug(
"{MethodName} has started. Excerpt: #{BlockIndex} {BlockHash} " +
"Count of {BlockCandidateTable}: {Count}",
nameof(ConsumeBlockCandidates),
latest.Value.Index,
latest.Value.Header,
nameof(BlockCandidateTable),
BlockCandidateTable.Count);
_ = BlockCandidateProcess(
blocks,
timeout,
cancellationToken);
BlockAppended.Set();
}
}
else
{
await Task.Delay(checkInterval, cancellationToken);
continue;
}
BlockCandidateTable.Cleanup(IsBlockNeeded);
}
}
private async Task ProcessFillBlocks(
TimeSpan timeout,
CancellationToken cancellationToken
)
{
var sessionRandom = new Random();
IComparer <BlockPerception> canonComparer = BlockChain.Policy.CanonicalChainComparer;
while (!cancellationToken.IsCancellationRequested)
{
int sessionId = sessionRandom.Next();
if (!(BlockDemand is { } blockDemand))
{
await Task.Delay(1, cancellationToken);
continue;
}
BoundPeer peer = blockDemand.Peer;
try
{
if (canonComparer.Compare(
BlockChain.PerceiveBlock(BlockDemand?.Header),
BlockChain.PerceiveBlock(BlockChain.Tip)
) <= 0)
{
using (await _blockSyncMutex.LockAsync(cancellationToken))
{
BlockDemand = null;
continue;
}
}
var hash = new BlockHash(blockDemand.Header.Hash);
const string startLogMsg =
"{SessionId}: Got a new " + nameof(BlockDemand) + " from {Peer}; started " +
"to fetch the block #{BlockIndex} {BlockHash}...";
_logger.Debug(startLogMsg, sessionId, peer, blockDemand.Header.Index, hash);
await SyncPreviousBlocksAsync(
blockChain : BlockChain,
peer : peer,
stop : hash,
progress : null,
timeout : timeout,
totalBlockCount : 0,
logSessionId : sessionId,
cancellationToken : cancellationToken
);
_logger.Debug(
"{SessionId}: Synced block(s) from {Peer}; broadcast them to neighbors...",
sessionId,
peer
);
// FIXME: Clean up events
BlockReceived.Set();
BlockAppended.Set();
BroadcastBlock(peer.Address, BlockChain.Tip);
ProcessFillBlocksFinished.Set();
}
catch (TimeoutException)
{
const string msg =
"{SessionId}: Timeout occurred during " + nameof(ProcessFillBlocks) +
"() from {Peer}.";
_logger.Debug(msg, sessionId, peer);
}
catch (InvalidBlockIndexException ibie)
{
const string msg =
"{SessionId}: " + nameof(InvalidBlockIndexException) + " occurred during " +
nameof(ProcessFillBlocks) + "() from {Peer}: {Exception}";
_logger.Warning(ibie, msg, sessionId, peer, ibie);
}
catch (Exception e)
{
const string msg =
"{SessionId}: Unexpected exception occurred during " +
nameof(ProcessFillBlocks) + "() from {Peer}: {Exception}";
_logger.Error(e, msg, sessionId, peer, e);
}
finally
{
using (await _blockSyncMutex.LockAsync(cancellationToken))
{
const string msg =
"{SessionId}: " + nameof(ProcessFillBlocks) + "() finished.";
_logger.Debug(msg, sessionId);
if (BlockDemand.Equals(blockDemand))
{
const string resetMsg =
"{SessionId}: Reset " + nameof(BlockDemand) + "...";
_logger.Debug(resetMsg, sessionId);
BlockDemand = null;
}
}
}
}
}
