public async Task <BeaconBlock> NewBlockAsync(Slot slot, BlsSignature randaoReveal)
{
if (slot == Slot.Zero)
{
throw new ArgumentException("Can't generate new block for slot 0, as it is the genesis block.");
}
if (!_storeProvider.TryGetStore(out IStore? retrievedStore))
{
throw new Exception("Beacon chain is currently syncing or waiting for genesis.");
}
IStore store = retrievedStore !;
Slot previousSlot = slot - Slot.One;
Hash32 head = await _forkChoice.GetHeadAsync(store);
if (!store.TryGetBlock(head, out BeaconBlock? headBlock))
{
throw new Exception($"Cannot find block for head root {head}");
}
BeaconBlock parentBlock;
BeaconState?retrievedParentState;
Hash32 parentRoot;
if (headBlock !.Slot > previousSlot)
{
// Requesting a block for a past slot?
Hash32 ancestorSigningRoot = _forkChoice.GetAncestor(store, head, previousSlot);
if (!store.TryGetBlock(ancestorSigningRoot, out BeaconBlock? retrievedParentBlock))
{
throw new Exception($"Cannot find block for ancestor signing root {ancestorSigningRoot}");
}
parentBlock = retrievedParentBlock !;
if (!store.TryGetBlockState(ancestorSigningRoot, out retrievedParentState))
{
throw new Exception($"Cannot find state for ancestor signing root {ancestorSigningRoot}");
}
parentRoot = ancestorSigningRoot;
}
public async Task <ValidatorDuty> GetValidatorDutyAsync(BlsPublicKey validatorPublicKey, Epoch epoch)
{
if (!_storeProvider.TryGetStore(out IStore? retrievedStore))
{
throw new Exception("Beacon chain is currently syncing or waiting for genesis.");
}
IStore store = retrievedStore !;
Hash32 head = await _forkChoice.GetHeadAsync(store);
if (!store.TryGetBlockState(head, out BeaconState? headState))
{
throw new Exception($"Head state {head} not found.");
}
Epoch currentEpoch = _beaconStateAccessor.GetCurrentEpoch(headState !);
Epoch nextEpoch = currentEpoch + Epoch.One;
if (epoch == Epoch.None)
{
epoch = currentEpoch;
}
else if (epoch > nextEpoch)
{
throw new ArgumentOutOfRangeException(nameof(epoch), epoch,
$"Duties cannot look ahead more than the next epoch {nextEpoch}.");
}
TimeParameters timeParameters = _timeParameterOptions.CurrentValue;
Slot startSlot = _beaconChainUtility.ComputeStartSlotOfEpoch(epoch);
Slot endSlot = startSlot + new Slot(timeParameters.SlotsPerEpoch);
Slot attestationSlot = Slot.None;
CommitteeIndex attestationCommitteeIndex = CommitteeIndex.None;
Slot blockProposalSlot = Slot.None;
if (epoch == nextEpoch)
{
// Clone for next or current, so that it can be safely mutated (transitioned forward)
BeaconState state = BeaconState.Clone(headState !);
_beaconStateTransition.ProcessSlots(state, startSlot);
// Check base state
ValidatorIndex validatorIndex = CheckValidatorIndex(state, validatorPublicKey);
CheckStateDuty(state, validatorIndex, ref attestationSlot, ref attestationCommitteeIndex, ref blockProposalSlot);
// Check future states
CheckFutureSlots(state, endSlot, validatorIndex, ref attestationSlot, ref attestationCommitteeIndex, ref blockProposalSlot);
}
else if (epoch == currentEpoch)
{
// Take block slot and roots before cloning (for historical checks)
IReadOnlyList <Hash32> historicalBlockRoots = headState !.BlockRoots;
Slot fromSlot = headState !.Slot;
BeaconState state = BeaconState.Clone(headState !);
// Check base state
ValidatorIndex validatorIndex = CheckValidatorIndex(state, validatorPublicKey);
CheckStateDuty(state, validatorIndex, ref attestationSlot, ref attestationCommitteeIndex, ref blockProposalSlot);
// Check future states
CheckFutureSlots(state, endSlot, validatorIndex, ref attestationSlot, ref attestationCommitteeIndex,
ref blockProposalSlot);
// Check historical states
if (startSlot < fromSlot && (attestationSlot == Slot.None || blockProposalSlot == Slot.None))
{
CheckHistoricalSlots(store, historicalBlockRoots, fromSlot, startSlot, validatorIndex,
ref attestationSlot, ref attestationCommitteeIndex, ref blockProposalSlot);
}
}
else
{
Hash32 endRoot = _forkChoice.GetAncestor(store, head, endSlot - Slot.One);
if (!store.TryGetBlockState(endRoot, out BeaconState? endState))
{
throw new Exception($"State {endRoot} for slot {endSlot} not found.");
}
BeaconState state = endState !;
// Check base state
ValidatorIndex validatorIndex = CheckValidatorIndex(state, validatorPublicKey);
CheckStateDuty(state, validatorIndex, ref attestationSlot, ref attestationCommitteeIndex, ref blockProposalSlot);
// Check historical states
IReadOnlyList <Hash32> historicalBlockRoots = state.BlockRoots;
Slot fromSlot = state.Slot;
if (attestationSlot == Slot.None || blockProposalSlot == Slot.None)
{
CheckHistoricalSlots(store, historicalBlockRoots, fromSlot, startSlot, validatorIndex,
ref attestationSlot, ref attestationCommitteeIndex, ref blockProposalSlot);
}
}
// HACK: Shards were removed from Phase 0, but analogy is committee index, so use for initial testing.
Shard attestationShard = new Shard((ulong)attestationCommitteeIndex);
ValidatorDuty validatorDuty =
new ValidatorDuty(validatorPublicKey, attestationSlot, attestationShard, blockProposalSlot);
return(validatorDuty);
}