/// <inheritdoc/>
internal override async Task <StepResult> ExecuteAsync(ChainedBlock nextChainedBlock, CancellationToken token, bool disposeMode)
{
this.logger.LogTrace("({0}:'{1}',{2}:{3})", nameof(nextChainedBlock), nextChainedBlock, nameof(disposeMode), disposeMode);
if (disposeMode)
{
this.logger.LogTrace("(-)[DISPOSE]:{0}", StepResult.Stop);
return(StepResult.Stop);
}
var context = new BlockStoreInnerStepContext(token, this.BlockStoreLoop, nextChainedBlock, this.loggerFactory, this.dateTimeProvider);
while (!token.IsCancellationRequested)
{
foreach (BlockStoreInnerStep innerStep in context.InnerSteps.ToList())
{
InnerStepResult innerStepResult = await innerStep.ExecuteAsync(context);
if (innerStepResult == InnerStepResult.Stop)
{
this.logger.LogTrace("(-)[INNER]:{0}", StepResult.Next);
return(StepResult.Next);
}
}
}
this.logger.LogTrace("(-):{0}", StepResult.Next);
return(StepResult.Next);
}
/// <inheritdoc/>
public override async Task <InnerStepResult> ExecuteAsync(BlockStoreInnerStepContext context)
{
var batchSize = BlockStoreInnerStepContext.DownloadStackThreshold - context.DownloadStack.Count;
var batchList = new List <ChainedBlock>(batchSize);
while (batchList.Count < batchSize)
{
if (await this.ShouldStopFindingBlocksAsync(context))
{
context.StopFindingBlocks();
break;
}
batchList.Add(context.NextChainedBlock);
context.DownloadStack.Enqueue(context.NextChainedBlock);
context.GetNextBlock();
}
if (batchList.Any())
{
this.logger.LogTrace("{0} blocks requested to be downloaded by the puller.", batchList.Count);
context.BlockStoreLoop.BlockPuller.AskForMultipleBlocks(batchList.ToArray());
}
return(InnerStepResult.Next);
}
/// <inheritdoc/>
public override async Task <InnerStepResult> ExecuteAsync(BlockStoreInnerStepContext context)
{
if (!context.DownloadStack.Any())
{
this.logger.LogTrace("(-)[EMPTY_STACK1]:{0}", InnerStepResult.Stop);
return(InnerStepResult.Stop);
}
while (context.BlocksPushedCount <= BlockStoreInnerStepContext.DownloadStackPushThreshold)
{
DownloadedBlock downloadedBlock;
ChainedBlock nextBlock = context.DownloadStack.Peek();
if (context.BlockStoreLoop.BlockPuller.TryGetBlock(nextBlock, out downloadedBlock))
{
this.logger.LogTrace("Puller provided block '{0}', length {1}.", nextBlock, downloadedBlock.Length);
ChainedBlock lastBlockToPush = this.AddDownloadedBlockToStore(context, downloadedBlock);
if (this.ShouldBlocksBePushedToRepository(context))
{
await this.PushBlocksToRepositoryAsync(context, lastBlockToPush);
if (!context.DownloadStack.Any())
{
this.logger.LogTrace("(-)[EMPTY_STACK2]:{0}", InnerStepResult.Stop);
return(InnerStepResult.Stop);
}
}
}
else
{
if (context.StallCount > context.StallCountThreshold)
{
// Increase limit by 10 % to allow adjustments for low speed connections.
// Eventually, the limit be high enough to allow normal operation.
context.StallCountThreshold += context.StallCountThreshold / 10;
this.logger.LogTrace("Stall count threshold increased to {0}.", context.StallCountThreshold);
this.logger.LogTrace("(-)[STALLING]:{0}", InnerStepResult.Stop);
return(InnerStepResult.Stop);
}
this.logger.LogTrace("Block '{0}' not available, stall count is {1}, waiting {2} ms...", nextBlock, context.StallCount, BlockStoreInnerStepContext.StallDelayMs);
await Task.Delay(BlockStoreInnerStepContext.StallDelayMs, context.CancellationToken);
context.StallCount++;
}
}
context.BlocksPushedCount = 0;
this.logger.LogTrace("(-):{0}", InnerStepResult.Next);
return(InnerStepResult.Next);
}
/// <summary> Adds the downloaded block to the store and resets the stall count.</summary>
private ChainedBlock AddDownloadedBlockToStore(BlockStoreInnerStepContext context, DownloadedBlock downloadedBlock)
{
this.logger.LogTrace("({0}.{1}:{2})", nameof(downloadedBlock), nameof(downloadedBlock.Length), downloadedBlock.Length);
ChainedBlock chainedBlockToStore = context.DownloadStack.Dequeue();
context.Store.Add(new BlockPair(downloadedBlock.Block, chainedBlockToStore));
context.InsertBlockSize += downloadedBlock.Length;
context.StallCount = 0;
this.logger.LogTrace("(-):'{0}'", chainedBlockToStore);
return(chainedBlockToStore);
}
/// <summary>
/// Push (persist) the downloaded blocks to the block repository
/// </summary>
/// <param name="lastDownloadedBlock">Last block in the list to store, also used to set the store tip.</param>
private async Task PushBlocksToRepositoryAsync(BlockStoreInnerStepContext context, ChainedBlock lastDownloadedBlock)
{
this.logger.LogTrace("()");
List <Block> blocksToStore = context.Store.Select(bp => bp.Block).ToList();
await context.BlockStoreLoop.BlockRepository.PutAsync(lastDownloadedBlock.HashBlock, blocksToStore);
context.BlocksPushedCount += blocksToStore.Count;
this.logger.LogTrace("{0} blocks pushed to the repository, {1} blocks pushed in total.", blocksToStore.Count, context.BlocksPushedCount);
context.BlockStoreLoop.SetStoreTip(lastDownloadedBlock);
context.InsertBlockSize = 0;
context.LastDownloadStackFlushTime = context.DateTimeProvider.GetUtcNow();
context.Store.Clear();
this.logger.LogTrace("(-)");
}
/// <summary> Determines whether or not its time for <see cref="BlockStoreInnerStepReadBlocks"/>
/// to push (persist) the downloaded blocks to the repository.</summary>
private bool ShouldBlocksBePushedToRepository(BlockStoreInnerStepContext context)
{
this.logger.LogTrace("()");
DateTime now = context.DateTimeProvider.GetUtcNow();
uint lastFlushDiff = (uint)(now - context.LastDownloadStackFlushTime).TotalMilliseconds;
bool pushBufferSizeReached = context.InsertBlockSize > BlockStoreLoop.MaxInsertBlockSize;
bool downloadStackEmpty = !context.DownloadStack.Any();
bool pushTimeReached = lastFlushDiff > BlockStoreInnerStepContext.MaxDownloadStackFlushTimeMs;
this.logger.LogTrace("Insert block size is {0} bytes{1}, download stack contains {2} blocks, last flush time was {3} ms ago{4}.",
context.InsertBlockSize, pushBufferSizeReached ? " (threshold reached)" : "", context.DownloadStack.Count, lastFlushDiff, pushTimeReached ? " (threshold reached)" : "");
bool res = pushBufferSizeReached || downloadStackEmpty || pushTimeReached;
this.logger.LogTrace("(-):{0}", res);
return(res);
}
private async Task <bool> ShouldStopFindingBlocksAsync(BlockStoreInnerStepContext context)
{
this.logger.LogTrace("()");
if (context.NextChainedBlock == null)
{
this.logger.LogTrace("(-)[NULL_NEXT]:true");
return(true);
}
if ((context.InputChainedBlock != null) && (context.NextChainedBlock.Header.HashPrevBlock != context.InputChainedBlock.HashBlock))
{
this.logger.LogTrace("(-)[NEXT_NEQ_INPUT]:true");
return(true);
}
if (context.NextChainedBlock.Height > context.BlockStoreLoop.ChainState.ConsensusTip?.Height)
{
this.logger.LogTrace("(-)[NEXT_HEIGHT_GT_CONSENSUS_TIP]:true");
return(true);
}
if (context.BlockStoreLoop.PendingStorage.ContainsKey(context.NextChainedBlock.HashBlock))
{
this.logger.LogTrace("Chained block '{0}' already exists in the pending storage.", context.NextChainedBlock);
this.logger.LogTrace("(-)[NEXT_ALREADY_EXISTS_PENDING_STORE]:true");
return(true);
}
if (await context.BlockStoreLoop.BlockRepository.ExistAsync(context.NextChainedBlock.HashBlock))
{
this.logger.LogTrace("Chained block '{0}' already exists in the repository.", context.NextChainedBlock);
this.logger.LogTrace("(-)[NEXT_ALREADY_EXISTS_REPOSITORY]:true");
return(true);
}
this.logger.LogTrace("(-):false");
return(false);
}
public abstract Task <InnerStepResult> ExecuteAsync(BlockStoreInnerStepContext context);
