public async void should_verify_transactions_when_block_is_tip()
{
//arrange
var block = BuildBlock();
GivenVerificationPasses(block);
GivenBlockIsNextTip(block, block.Header.Height - 1, block.Header.Timestamp - 1, block.Header.Difficulty);
A.CallTo(() => _blockVerifier.VerifyTransactions(block))
.Returns(false);
//act
var result = await _subject.RecieveBlock(block);
//assert
A.CallTo(() => _blockVerifier.VerifyTransactions(block))
.MustHaveHappened();
A.CallTo(() => _blockRepository.AddBlock(block))
.MustNotHaveHappened();
A.CallTo(() => _unconfirmedTransactionPool.Remove(block.Transactions))
.MustNotHaveHappened();
result.Should().Be(PeerDataResult.Demerit);
}
private async Task <PeerDataResult> RecieveBlockUnprotected(Block block)
{
var isTip = false;
_logger.LogInformation($"Recv block {block.Header.Height} {BitConverter.ToString(block.Header.BlockId)}");
if (await _blockRepository.HavePrimaryBlock(block.Header.BlockId))
{
_logger.LogInformation("already have block");
return(PeerDataResult.Ignore);
}
if (!await _blockVerifier.Verify(block))
{
_logger.LogWarning($"Block verification failed for {BitConverter.ToString(block.Header.BlockId)}");
return(PeerDataResult.Demerit);
}
if (!await _blockVerifier.VerifyBlockRules(block, true))
{
_logger.LogWarning($"Block rules failed for {BitConverter.ToString(block.Header.BlockId)}");
return(PeerDataResult.Demerit);
}
var prevHeader = await _blockRepository.GetBlockHeader(block.Header.PreviousBlock);
var bestHeader = await _blockRepository.GetBestBlockHeader();
var isEmpty = await _blockRepository.IsEmpty();
bool mainChain = false;
bool rebaseChain = false;
isTip = (block.Header.PreviousBlock.SequenceEqual(bestHeader?.BlockId ?? Block.HeadKey));
_logger.LogInformation($"Is Tip {isTip}");
if (prevHeader != null)
{
_logger.LogInformation("Do Have previous block");
if (block.Header.Timestamp < prevHeader.Timestamp)
{
_logger.LogInformation("Timestamps dont match");
return(PeerDataResult.Ignore);
}
if (block.Header.Height != (prevHeader.Height + 1))
{
_logger.LogInformation($"Height mismatch prev: {prevHeader.Height}, this: {block.Header.Height}");
return(PeerDataResult.Ignore);
}
if (!isTip)
{
var prevMain = await _blockRepository.GetPrimaryHeader(block.Header.Height - 1);
var isPrevOnMainChain = prevMain?.BlockId.SequenceEqual(block.Header.PreviousBlock) ?? false;
var mainExisiting = await _blockRepository.GetPrimaryHeader(block.Header.Height);
mainChain = ((mainExisiting == null) && (isPrevOnMainChain));
}
else
{
mainChain = true;
}
rebaseChain = ((block.Header.Height > bestHeader.Height) && !mainChain);
_logger.LogInformation($"Processing block, have prev, main chain: {mainChain}, rebase: {rebaseChain}");
var expectedDifficulty = await _difficultyCalculator.CalculateDifficulty(prevHeader.Timestamp);
if ((mainChain) && (block.Header.Difficulty < expectedDifficulty))
{
_logger.LogInformation("Difficulty mismatch");
return(PeerDataResult.Ignore);
}
}
else
{
_logger.LogInformation("Dont have prev block");
if (isEmpty && !block.Header.PreviousBlock.SequenceEqual(Block.HeadKey))
{
_logger.LogInformation("not first block but am empty");
return(PeerDataResult.Ignore);
}
mainChain = isEmpty;
_logger.LogInformation($"Processing block, missing prev, main chain: {mainChain}, rebase: {rebaseChain}");
_peerNetwork.RequestBlock(block.Header.PreviousBlock);
}
if (mainChain)
{
_logger.LogInformation("processing for main chain");
if (!await _blockVerifier.VerifyTransactions(block))
{
_logger.LogWarning($"Block txn verification failed for {BitConverter.ToString(block.Header.BlockId)}");
return(PeerDataResult.Demerit);
}
await _blockRepository.AddBlock(block);
_unconfirmedTransactionPool.Remove(block.Transactions);
}
else
{
if (!await _blockRepository.HaveSecondaryBlock(block.Header.BlockId))
{
_logger.LogInformation($"Adding detached block");
await _blockRepository.AddSecondaryBlock(block);
}
if (rebaseChain)
{
_logger.LogInformation($"Searching for divergent block");
var divergentHeader = await _blockRepository.GetDivergentHeader(block.Header.BlockId);
if (divergentHeader != null)
{
_logger.LogInformation($"Rebasing chain from {divergentHeader.Height}");
var replayBlocks = await _forkRebaser.RebaseChain(divergentHeader.BlockId, block.Header.BlockId);
_logger.LogInformation($"Replaying {replayBlocks.Count} blocks");
foreach (var replayBlock in replayBlocks)
{
var replayResult = await RecieveBlockUnprotected(replayBlock);
if (replayResult == PeerDataResult.Demerit)
{
break;
}
}
_logger.LogInformation($"Replay complete");
}
else
{
_logger.LogInformation($"Divergent block not found");
var firstForkHeader = await _forkRebaser.FindKnownForkbase(block.Header.BlockId);
if (firstForkHeader != null)
{
_peerNetwork.RequestBlock(firstForkHeader.PreviousBlock);
}
}
}
}
if (isTip)
{
_logger.LogDebug($"Accepted tip block {BitConverter.ToString(block.Header.BlockId)}");
return(PeerDataResult.Relay);
}
else
{
_logger.LogDebug($"Accepted block {BitConverter.ToString(block.Header.BlockId)}");
return(PeerDataResult.Ignore);
}
}