public bool CanSignBlock(UInt256 blockNumber, Keccak parentHash)
{
Snapshot snapshot = GetOrCreateSnapshot(blockNumber - 1, parentHash);
if (!snapshot.Signers.ContainsKey(_key.Address))
{
if (_logger.IsTrace)
{
_logger.Trace("Not on the signers list");
}
return(false);
}
// If we're amongst the recent signers, wait for the next block
if (snapshot.HasSignedRecently(blockNumber, _key.Address))
{
if (_logger.IsTrace)
{
_logger.Trace("Signed recently");
}
return(false);
}
return(true);
}
public bool ValidateSeal(BlockHeader header)
{
UInt256 number = header.Number;
// Retrieve the snapshot needed to validate this header and cache it
Snapshot snapshot = GetOrCreateSnapshot(number - 1, header.ParentHash);
// Resolve the authorization key and check against signers
header.Author = header.Author ?? GetBlockSealer(header);
Address signer = header.Author;
if (!snapshot.Signers.ContainsKey(signer))
{
if (_logger.IsWarn)
{
_logger.Warn($"Invalid block signer {signer} - not authorized to sign a block");
}
return(false);
}
if (snapshot.HasSignedRecently(number, signer))
{
if (_logger.IsWarn)
{
_logger.Warn($"Invalid block signer {signer} - the signer is among recents");
}
return(false);
}
// Ensure that the difficulty corresponds to the turn-ness of the signer
bool inTurn = snapshot.InTurn(header.Number, signer);
if (inTurn && header.Difficulty != Clique.DifficultyInTurn)
{
if (_logger.IsWarn)
{
_logger.Warn($"Invalid block difficulty {header.Difficulty} - should be in-turn {Clique.DifficultyInTurn}");
}
return(false);
}
if (!inTurn && header.Difficulty != Clique.DifficultyNoTurn)
{
if (_logger.IsWarn)
{
_logger.Warn($"Invalid block difficulty {header.Difficulty} - should be no-turn {Clique.DifficultyNoTurn}");
}
return(false);
}
return(true);
}
