public static ISourceBlock<BlockTx> LookAhead(ISourceBlock<BlockTx> blockTxes, IDeferredChainStateCursor deferredChainStateCursor, CancellationToken cancelToken = default(CancellationToken))
{
// capture the original block txes order
var orderedBlockTxes = OrderingBlock.CaptureOrder<BlockTx, BlockTx, int>(
blockTxes, blockTx => blockTx.Index, cancelToken);
// queue each utxo entry to be warmed up: each input's previous transaction, and each new transaction
var queueUnspentTxLookup = InitQueueUnspentTxLookup(cancelToken);
orderedBlockTxes.LinkTo(queueUnspentTxLookup, new DataflowLinkOptions { PropagateCompletion = true });
// warm up each uxto entry
var warmupUtxo = InitWarmupUtxo(deferredChainStateCursor, cancelToken);
queueUnspentTxLookup.LinkTo(warmupUtxo, new DataflowLinkOptions { PropagateCompletion = true });
// return the block txes with warmed utxo entries in original order
return orderedBlockTxes.ApplyOrder(warmupUtxo, blockTx => blockTx.Index, cancelToken);
}
private static TransformManyBlock<Tuple<UInt256, CompletionCount, BlockTx>, BlockTx> InitWarmupUtxo(IDeferredChainStateCursor deferredChainStateCursor, CancellationToken cancelToken)
{
return new TransformManyBlock<Tuple<UInt256, CompletionCount, BlockTx>, BlockTx>(
tuple =>
{
var txHash = tuple.Item1;
var completionCount = tuple.Item2;
var blockTx = tuple.Item3;
deferredChainStateCursor.WarmUnspentTx(txHash);
if (completionCount.TryComplete())
return new[] { blockTx };
else
return new BlockTx[0];
},
new ExecutionDataflowBlockOptions { CancellationToken = cancelToken, MaxDegreeOfParallelism = Math.Min(Environment.ProcessorCount, deferredChainStateCursor.CursorCount) });
}
private static TransformManyBlock<Tuple<TxOutputKey, CompletionCount, DecodedBlockTx>, DecodedBlockTx> InitWarmupUtxo(IDeferredChainStateCursor deferredChainStateCursor, CancellationToken cancelToken)
{
return new TransformManyBlock<Tuple<TxOutputKey, CompletionCount, DecodedBlockTx>, DecodedBlockTx>(
tuple =>
{
var txOutputKey = tuple.Item1;
var completionCount = tuple.Item2;
var blockTx = tuple.Item3;
if (txOutputKey.TxOutputIndex == uint.MaxValue)
deferredChainStateCursor.WarmUnspentTx(txOutputKey.TxHash);
else
deferredChainStateCursor.WarmUnspentTxOutput(txOutputKey);
if (completionCount.TryComplete())
return new[] { blockTx };
else
return new DecodedBlockTx[0];
},
new ExecutionDataflowBlockOptions { CancellationToken = cancelToken, MaxDegreeOfParallelism = Math.Min(Environment.ProcessorCount, deferredChainStateCursor.CursorCount) });
}
private static TransformManyBlock <Tuple <TxOutputKey, CompletionCount, DecodedBlockTx>, DecodedBlockTx> InitWarmupUtxo(IDeferredChainStateCursor deferredChainStateCursor, CancellationToken cancelToken)
{
return(new TransformManyBlock <Tuple <TxOutputKey, CompletionCount, DecodedBlockTx>, DecodedBlockTx>(
tuple =>
{
var txOutputKey = tuple.Item1;
var completionCount = tuple.Item2;
var blockTx = tuple.Item3;
if (txOutputKey.TxOutputIndex == uint.MaxValue)
{
deferredChainStateCursor.WarmUnspentTx(txOutputKey.TxHash);
}
else
{
deferredChainStateCursor.WarmUnspentTxOutput(txOutputKey);
}
if (completionCount.TryComplete())
{
return new[] { blockTx }
}
;
else
{
return new DecodedBlockTx[0];
}
},
new ExecutionDataflowBlockOptions {
CancellationToken = cancelToken, MaxDegreeOfParallelism = Math.Min(Environment.ProcessorCount, deferredChainStateCursor.CursorCount)
}));
}
public static ISourceBlock <DecodedBlockTx> LookAhead(ISourceBlock <DecodedBlockTx> blockTxes, IDeferredChainStateCursor deferredChainStateCursor, CancellationToken cancelToken = default(CancellationToken))
{
// capture the original block txes order
var orderedBlockTxes = OrderingBlock.CaptureOrder <DecodedBlockTx, DecodedBlockTx, int>(
blockTxes, blockTx => blockTx.Index, cancelToken);
// queue each utxo entry to be warmed up: each input's previous transaction, and each new transaction
var queueUnspentTxLookup = InitQueueUnspentTxLookup(cancelToken);
orderedBlockTxes.LinkTo(queueUnspentTxLookup, new DataflowLinkOptions {
PropagateCompletion = true
});
// warm up each uxto entry
var warmupUtxo = InitWarmupUtxo(deferredChainStateCursor, cancelToken);
queueUnspentTxLookup.LinkTo(warmupUtxo, new DataflowLinkOptions {
PropagateCompletion = true
});
// return the block txes with warmed utxo entries in original order
return(orderedBlockTxes.ApplyOrder(warmupUtxo, blockTx => blockTx.Index, cancelToken));
}
