/// <summary>
/// The entrance of block syncing.
/// First step is to validate block header of this block.
/// </summary>
/// <param name="block"></param>
/// <returns></returns>
public async Task ReceiveBlock(IBlock block)
{
if (_terminated)
{
return;
}
var isReceiveBlock = await IsReceiveBlock(block);
if (!isReceiveBlock)
{
return;
}
if (!_blockSet.IsBlockReceived(block.GetHash(), block.Index))
{
_blockSet.AddBlock(block);
// Notify the network layer the block has been accepted.
MessageHub.Instance.Publish(new BlockAccepted(block));
}
if (CurrentState != NodeState.Catching && CurrentState != NodeState.Caught)
{
return;
}
var blockHeaderValidationResult =
await _blockHeaderValidator.ValidateBlockHeaderAsync(block.Header);
_logger?.Trace(
$"BlockHeader validation result: {blockHeaderValidationResult.ToString()} - {block.BlockHashToHex}. Height: *{block.Index}*");
if (blockHeaderValidationResult == BlockHeaderValidationResult.Success)
{
// Catching -> BlockValidating
// Caught -> BlockValidating
MessageHub.Instance.Publish(StateEvent.ValidBlockHeader);
await HandleBlock(block);
}
if (blockHeaderValidationResult == BlockHeaderValidationResult.Unlinkable)
{
MessageHub.Instance.Publish(new UnlinkableHeader(block.Header));
}
if (blockHeaderValidationResult == BlockHeaderValidationResult.MaybeForked)
{
MessageHub.Instance.Publish(StateEvent.LongerChainDetected);
}
if (blockHeaderValidationResult == BlockHeaderValidationResult.Branched)
{
MessageHub.Instance.Publish(new LockMining(false));
}
if (await IsRequestNextBlockAgain(block))
{
MessageHub.Instance.Publish(new BlockAccepted(block));
}
}
