public async Task <List <ChainBlockLink> > ExecuteBlocksAttachedToLongestChain(Chain chain, BlockAttachOperationStatus status) { if (!status.HasFlag(BlockAttachOperationStatus.LongestChainFound)) { Logger.LogTrace($"Try to attach to chain but the status is {status}."); return(null); } var successLinks = new List <ChainBlockLink>(); var successBlocks = new List <Block>(); var blockLinks = await _chainManager.GetNotExecutedBlocks(chain.LongestChainHash); try { foreach (var blockLink in blockLinks) { var linkedBlock = await _blockchainService.GetBlockByHashAsync(blockLink.BlockHash); var processResult = await TryProcessBlockAsync(linkedBlock); if (!processResult) { await _chainManager.SetChainBlockLinkExecutionStatusAsync(blockLink, ChainBlockLinkExecutionStatus.ExecutionFailed); await _chainManager.RemoveLongestBranchAsync(chain); return(null); } successLinks.Add(blockLink); successBlocks.Add(linkedBlock); Logger.LogInformation( $"Executed block {blockLink.BlockHash} at height {blockLink.Height}, with {linkedBlock.Body.TransactionsCount} txns."); await LocalEventBus.PublishAsync(new BlockAcceptedEvent { Block = linkedBlock }); } } catch (BlockValidationException ex) { if (!(ex.InnerException is ValidateNextTimeBlockValidationException)) { await _chainManager.RemoveLongestBranchAsync(chain); throw; } Logger.LogWarning( $"Block validation failed: {ex.Message}. Inner exception {ex.InnerException.Message}"); } catch (Exception ex) { await _chainManager.RemoveLongestBranchAsync(chain); Logger.LogWarning($"Block validate or execute fails. Exception message {ex.Message}"); throw; } if (successLinks.Count == 0 || successLinks.Last().Height < chain.BestChainHeight) { Logger.LogWarning("No block execution succeed or no block is higher than best chain."); await _chainManager.RemoveLongestBranchAsync(chain); return(null); } await SetBestChainAsync(successLinks, chain); await _chainManager.SetChainBlockLinkExecutionStatusesAsync(successLinks, ChainBlockLinkExecutionStatus.ExecutionSuccess); await PublishBestChainFoundEventAsync(chain, successBlocks); Logger.LogInformation( $"Attach blocks to best chain, status: {status}, best chain hash: {chain.BestChainHash}, height: {chain.BestChainHeight}"); return(blockLinks); }