/// <inheritdoc/>
public async Task <BlockExecutionResult> ExecuteBlock(IBlock block)
{
if (_isMining)
{
_logger?.Trace($"Prevent block {block.BlockHashToHex} from entering block execution," +
"for this node is doing mining.");
return(BlockExecutionResult.Mining);
}
_current = block.BlockHashToHex;
var result = Prepare(block);
if (result.IsFailed())
{
_current = null;
return(result);
}
var stopwatch = new Stopwatch();
stopwatch.Start();
_executing = true;
if (_terminated)
{
return(BlockExecutionResult.Terminated);
}
var txnRes = new List <TransactionResult>();
var readyTxs = new List <Transaction>();
var cts = new CancellationTokenSource();
var res = BlockExecutionResult.Fatal;
try
{
// get txn from pool
var tuple = CollectTransactions(block);
result = tuple.Item1;
readyTxs = tuple.Item2;
if (result.IsFailed() || readyTxs.Count == 0)
{
_logger?.Warn($"Collect transaction from block failed: {result}, block height: {block.Header.Index}, " +
$"block hash: {block.BlockHashToHex}.");
res = result;
return(res);
}
double distanceToTimeSlot = 0;
if (_isLimitExecutionTime)
{
distanceToTimeSlot = await _dpoSInfoProvider.GetDistanceToTimeSlotEnd();
cts.CancelAfter(TimeSpan.FromMilliseconds(distanceToTimeSlot * NodeConfig.Instance.RatioSynchronize));
}
var trs = await _txHub.GetReceiptsForAsync(readyTxs, cts);
if (cts.IsCancellationRequested)
{
return(BlockExecutionResult.ExecutionCancelled);
}
foreach (var tr in trs)
{
if (!tr.IsExecutable)
{
throw new InvalidBlockException($"Transaction is not executable, transaction: {tr}, " +
$"block height: {block.Header.Index}, block hash: {block.BlockHashToHex}, SignatureSt:{tr.SignatureSt},RefBlockSt:{tr.RefBlockSt},Status:{tr.Status}");
}
}
txnRes = await ExecuteTransactions(readyTxs, block.Header.ChainId, block.Header.GetDisambiguationHash(), cts);
if (cts.IsCancellationRequested)
{
_logger?.Trace($"Execution Cancelled and rollback: block hash: {block.BlockHashToHex}, execution time: {distanceToTimeSlot * NodeConfig.Instance.RatioSynchronize} ms.");
Rollback(block, txnRes).ConfigureAwait(false);
return(BlockExecutionResult.ExecutionCancelled);
}
txnRes = SortToOriginalOrder(txnRes, readyTxs);
var blockChain = _chainService.GetBlockChain(Hash.LoadHex(ChainConfig.Instance.ChainId));
if (await blockChain.GetBlockByHashAsync(block.GetHash()) != null)
{
res = BlockExecutionResult.AlreadyAppended;
return(res);
}
result = UpdateWorldState(block, txnRes);
if (result.IsFailed())
{
res = result;
return(res);
}
await UpdateCrossChainInfo(block, txnRes);
// BlockExecuting -> BlockAppending
// ExecutingLoop -> BlockAppending
MessageHub.Instance.Publish(StateEvent.StateUpdated);
await AppendBlock(block);
InsertTxs(txnRes, block);
await _txHub.OnNewBlock((Block)block);
res = BlockExecutionResult.Success;
return(res);
}
catch (Exception e)
{
_logger?.Error(e, $"Exception while execute block {block.BlockHashToHex}.");
// TODO, no wait may need improve
Rollback(block, txnRes).ConfigureAwait(false);
return(res);
}
finally
{
_current = null;
_executing = false;
cts.Dispose();
if (_prepareTerminated)
{
_terminated = true;
MessageHub.Instance.Publish(new TerminatedModule(TerminatedModuleEnum.BlockExecutor));
}
stopwatch.Stop();
if (res.CanExecuteAgain())
{
_logger?.Warn($"Block {block.BlockHashToHex} can execute again.");
}
_logger?.Info($"Executed block {block.BlockHashToHex} with result {res}, {block.Body.Transactions.Count} txns, " +
$"duration {stopwatch.ElapsedMilliseconds} ms.");
}
}