private async Task <DownloadBlocksResult> DownloadBlocksAsync(Chain chain, BlockDownloadJobInfo jobInfo)
{
var downloadResult = new DownloadBlocksResult();
if (jobInfo.CurrentTargetBlockHeight > 0)
{
if (jobInfo.CurrentTargetBlockHeight <= chain.BestChainHeight || await BlockIsInBestChain(chain,
jobInfo.CurrentTargetBlockHash, jobInfo.CurrentTargetBlockHeight))
{
downloadResult = await _blockDownloadService.DownloadBlocksAsync(new DownloadBlockDto
{
PreviousBlockHash = jobInfo.CurrentTargetBlockHash,
PreviousBlockHeight = jobInfo.CurrentTargetBlockHeight,
BatchRequestBlockCount = jobInfo.BatchRequestBlockCount,
SuggestedPeerPubkey = jobInfo.SuggestedPeerPubkey,
MaxBlockDownloadCount = _blockSyncOptions.MaxBlockDownloadCount
});
}
}
else
{
// Download blocks from longest chain
downloadResult = await _blockDownloadService.DownloadBlocksAsync(new DownloadBlockDto
{
PreviousBlockHash = chain.LongestChainHash,
PreviousBlockHeight = chain.LongestChainHeight,
BatchRequestBlockCount = jobInfo.BatchRequestBlockCount,
SuggestedPeerPubkey = jobInfo.SuggestedPeerPubkey,
MaxBlockDownloadCount = _blockSyncOptions.MaxBlockDownloadCount
});
// Download blocks from best chain
if (downloadResult.DownloadBlockCount == 0)
{
downloadResult = await _blockDownloadService.DownloadBlocksAsync(new DownloadBlockDto
{
PreviousBlockHash = chain.BestChainHash,
PreviousBlockHeight = chain.BestChainHeight,
BatchRequestBlockCount = jobInfo.BatchRequestBlockCount,
SuggestedPeerPubkey = jobInfo.SuggestedPeerPubkey,
MaxBlockDownloadCount = _blockSyncOptions.MaxBlockDownloadCount
});
}
// Download blocks from LIB
if (downloadResult.DownloadBlockCount == 0)
{
Logger.LogDebug($"Resynchronize from lib, lib height: {chain.LastIrreversibleBlockHeight}.");
downloadResult = await _blockDownloadService.DownloadBlocksAsync(new DownloadBlockDto
{
PreviousBlockHash = chain.LastIrreversibleBlockHash,
PreviousBlockHeight = chain.LastIrreversibleBlockHeight,
BatchRequestBlockCount = jobInfo.BatchRequestBlockCount,
SuggestedPeerPubkey = jobInfo.SuggestedPeerPubkey,
MaxBlockDownloadCount = _blockSyncOptions.MaxBlockDownloadCount
});
}
}
return(downloadResult);
}
/// <summary>
/// Download and attach blocks
/// UseSuggestedPeer == true: Download blocks from suggested peer directly;
/// Target download height > peer lib height, download blocks from suggested peer;
/// Target download height <= peer lib height, select a random peer to download.
/// </summary>
/// <param name="downloadBlockDto"></param>
/// <returns></returns>
public async Task <DownloadBlocksResult> DownloadBlocksAsync(DownloadBlockDto downloadBlockDto)
{
var downloadResult = new DownloadBlocksResult();
var peerPubkey = downloadBlockDto.SuggestedPeerPubkey;
try
{
if (UseSuggestedPeer(downloadBlockDto))
{
downloadResult = await DownloadBlocksAsync(peerPubkey, downloadBlockDto);
}
else
{
// If cannot get the blocks, there should be network problems or bad peer,
// because we have selected peer with lib height greater than or equal to the target height.
// 1. network problems, need to retry from other peer.
// 2. not network problems, this peer or the last peer is bad peer, we need to remove it.
var downloadTargetHeight =
downloadBlockDto.PreviousBlockHeight + downloadBlockDto.MaxBlockDownloadCount;
var exceptedPeers = new List <string> {
_blockSyncStateProvider.LastRequestPeerPubkey
};
var retryTimes = 2;
while (true)
{
peerPubkey = GetRandomPeerPubkey(downloadBlockDto.SuggestedPeerPubkey, downloadTargetHeight,
exceptedPeers);
downloadResult = await DownloadBlocksAsync(peerPubkey, downloadBlockDto);
if (downloadResult.Success || retryTimes <= 0)
{
break;
}
exceptedPeers.Add(peerPubkey);
retryTimes--;
}
if (downloadResult.Success && downloadResult.DownloadBlockCount == 0)
{
await CheckBadPeerAsync(peerPubkey, downloadBlockDto.PreviousBlockHash,
downloadBlockDto.PreviousBlockHeight);
}
}
}
catch (BlockDownloadException e)
{
await LocalEventBus.PublishAsync(new BadPeerFoundEventData
{
BlockHash = e.BlockHash,
BlockHeight = e.BlockHeight,
PeerPubkey = e.PeerPubkey
});
}
return(downloadResult);
}
private async Task <DownloadBlocksResult> DownloadBlocksAsync(Chain chain, BlockDownloadJobInfo jobInfo)
{
var downloadResult = new DownloadBlocksResult();
if (jobInfo.CurrentTargetBlockHeight == 0)
{
// Download blocks from longest chain
downloadResult = await _blockDownloadService.DownloadBlocksAsync(new DownloadBlockDto
{
PreviousBlockHash = chain.LongestChainHash,
PreviousBlockHeight = chain.LongestChainHeight,
BatchRequestBlockCount = jobInfo.BatchRequestBlockCount,
SuggestedPeerPubkey = jobInfo.SuggestedPeerPubkey,
MaxBlockDownloadCount = _blockSyncOptions.MaxBlockDownloadCount,
UseSuggestedPeer = true
});
// Download blocks from best chain
if (downloadResult.Success && downloadResult.DownloadBlockCount == 0)
{
downloadResult = await _blockDownloadService.DownloadBlocksAsync(new DownloadBlockDto
{
PreviousBlockHash = chain.BestChainHash,
PreviousBlockHeight = chain.BestChainHeight,
BatchRequestBlockCount = jobInfo.BatchRequestBlockCount,
SuggestedPeerPubkey = jobInfo.SuggestedPeerPubkey,
MaxBlockDownloadCount = _blockSyncOptions.MaxBlockDownloadCount,
UseSuggestedPeer = true
});
}
// Download blocks from LIB
if (downloadResult.Success && downloadResult.DownloadBlockCount == 0)
{
Logger.LogDebug($"Resynchronize from lib, lib height: {chain.LastIrreversibleBlockHeight}.");
downloadResult = await _blockDownloadService.DownloadBlocksAsync(new DownloadBlockDto
{
PreviousBlockHash = chain.LastIrreversibleBlockHash,
PreviousBlockHeight = chain.LastIrreversibleBlockHeight,
BatchRequestBlockCount = jobInfo.BatchRequestBlockCount,
SuggestedPeerPubkey = jobInfo.SuggestedPeerPubkey,
MaxBlockDownloadCount = _blockSyncOptions.MaxBlockDownloadCount,
UseSuggestedPeer = true
});
}
}
// If last target block didn't become the longest chain, stop this job.
else if (jobInfo.CurrentTargetBlockHeight <= chain.LongestChainHeight + 8)
{
downloadResult = await _blockDownloadService.DownloadBlocksAsync(new DownloadBlockDto
{
PreviousBlockHash = jobInfo.CurrentTargetBlockHash,
PreviousBlockHeight = jobInfo.CurrentTargetBlockHeight,
BatchRequestBlockCount = jobInfo.BatchRequestBlockCount,
SuggestedPeerPubkey = jobInfo.SuggestedPeerPubkey,
MaxBlockDownloadCount = _blockSyncOptions.MaxBlockDownloadCount,
UseSuggestedPeer = false
});
}
return(downloadResult);
}
