/// <summary>
/// Checks and computes stake.
/// </summary>
/// <param name="context">Context that contains variety of information regarding blocks validation and execution.</param>
/// <exception cref="ConsensusErrors.PrevStakeNull">Thrown if previous stake is not found.</exception>
/// <exception cref="ConsensusErrors.SetStakeEntropyBitFailed">Thrown if failed to set stake entropy bit.</exception>
private void CheckAndComputeStake(RuleContext context)
{
ChainedHeader chainedHeader = context.ValidationContext.ChainedHeaderToValidate;
Block block = context.ValidationContext.BlockToValidate;
var posRuleContext = context as PosRuleContext;
if (posRuleContext.BlockStake == null)
{
posRuleContext.BlockStake = BlockStake.Load(context.ValidationContext.BlockToValidate);
}
BlockStake blockStake = posRuleContext.BlockStake;
// Verify hash target and signature of coinstake tx.
if (BlockStake.IsProofOfStake(block))
{
ChainedHeader prevChainedHeader = chainedHeader.Previous;
BlockStake prevBlockStake = this.stakeChain.Get(prevChainedHeader.HashBlock);
if (prevBlockStake == null)
{
ConsensusErrors.PrevStakeNull.Throw();
}
// Only do proof of stake validation for blocks that are after the assumevalid block or after the last checkpoint.
if (!context.SkipValidation)
{
this.stakeValidator.CheckProofOfStake(posRuleContext, prevChainedHeader, prevBlockStake, block.Transactions[1], chainedHeader.Header.Bits.ToCompact());
}
else
{
this.Logger.LogTrace("POS validation skipped for block at height {0}.", chainedHeader.Height);
}
}
// PoW is checked in CheckBlock().
if (BlockStake.IsProofOfWork(block))
{
posRuleContext.HashProofOfStake = chainedHeader.Header.GetPoWHash();
}
// Compute stake entropy bit for stake modifier.
if (!blockStake.SetStakeEntropyBit(blockStake.GetStakeEntropyBit()))
{
this.Logger.LogTrace("(-)[STAKE_ENTROPY_BIT_FAIL]");
ConsensusErrors.SetStakeEntropyBitFailed.Throw();
}
// Record proof hash value.
blockStake.HashProof = posRuleContext.HashProofOfStake;
int lastCheckpointHeight = this.Parent.Checkpoints.GetLastCheckpointHeight();
if (chainedHeader.Height > lastCheckpointHeight)
{
// Compute stake modifier.
ChainedHeader prevChainedHeader = chainedHeader.Previous;
BlockStake blockStakePrev = prevChainedHeader == null ? null : this.stakeChain.Get(prevChainedHeader.HashBlock);
blockStake.StakeModifierV2 = this.stakeValidator.ComputeStakeModifierV2(prevChainedHeader, blockStakePrev?.StakeModifierV2, blockStake.IsProofOfWork() ? chainedHeader.HashBlock : blockStake.PrevoutStake.Hash);
}
else if (chainedHeader.Height == lastCheckpointHeight)
{
// Copy checkpointed stake modifier.
CheckpointInfo checkpoint = this.Parent.Checkpoints.GetCheckpoint(lastCheckpointHeight);
blockStake.StakeModifierV2 = checkpoint.StakeModifierV2;
this.Logger.LogTrace("Last checkpoint stake modifier V2 loaded: '{0}'.", blockStake.StakeModifierV2);
}
else
{
this.Logger.LogTrace("POS stake modifier computation skipped for block at height {0} because it is not above last checkpoint block height {1}.", chainedHeader.Height, lastCheckpointHeight);
}
}
public void CheckAndComputeStake(ContextInformation context)
{
this.logger.LogTrace("()");
ChainedBlock chainedBlock = context.BlockResult.ChainedBlock;
Block block = context.BlockResult.Block;
BlockStake blockStake = context.Stake.BlockStake;
int lastCheckpointHeight = this.checkpoints.GetLastCheckpointHeight();
// Verify hash target and signature of coinstake tx.
if (BlockStake.IsProofOfStake(block))
{
ChainedBlock prevChainedBlock = chainedBlock.Previous;
BlockStake prevBlockStake = this.stakeChain.Get(prevChainedBlock.HashBlock);
if (prevBlockStake == null)
{
ConsensusErrors.PrevStakeNull.Throw();
}
// Only do proof of stake validation for blocks after last checkpoint.
if (chainedBlock.Height > lastCheckpointHeight)
{
this.stakeValidator.CheckProofOfStake(context, prevChainedBlock, prevBlockStake, block.Transactions[1], chainedBlock.Header.Bits.ToCompact());
}
else
{
this.logger.LogTrace("POS validation skipped for block at height {0} because it is not above last checkpoint block height {1}.", chainedBlock.Height, lastCheckpointHeight);
}
}
// PoW is checked in CheckBlock().
if (BlockStake.IsProofOfWork(block))
{
context.Stake.HashProofOfStake = chainedBlock.Header.GetPoWHash();
}
// Compute stake entropy bit for stake modifier.
if (!blockStake.SetStakeEntropyBit(blockStake.GetStakeEntropyBit()))
{
this.logger.LogTrace("(-)[STAKE_ENTROPY_BIT_FAIL]");
ConsensusErrors.SetStakeEntropyBitFailed.Throw();
}
// Record proof hash value.
blockStake.HashProof = context.Stake.HashProofOfStake;
if (chainedBlock.Height > lastCheckpointHeight)
{
// Compute stake modifier.
ChainedBlock prevChainedBlock = chainedBlock.Previous;
BlockStake blockStakePrev = prevChainedBlock == null ? null : this.stakeChain.Get(prevChainedBlock.HashBlock);
blockStake.StakeModifierV2 = this.stakeValidator.ComputeStakeModifierV2(prevChainedBlock, blockStakePrev, blockStake.IsProofOfWork() ? chainedBlock.HashBlock : blockStake.PrevoutStake.Hash);
}
else if (chainedBlock.Height == lastCheckpointHeight)
{
// Copy checkpointed stake modifier.
CheckpointInfo checkpoint = this.checkpoints.GetCheckpoint(lastCheckpointHeight);
blockStake.StakeModifierV2 = checkpoint.StakeModifierV2;
this.logger.LogTrace("Last checkpoint stake modifier V2 loaded: '{0}'.", blockStake.StakeModifierV2);
}
else
{
this.logger.LogTrace("POS stake modifier computation skipped for block at height {0} because it is not above last checkpoint block height {1}.", chainedBlock.Height, lastCheckpointHeight);
}
this.logger.LogTrace("(-)[OK]");
}
