2021-01-18 20:34:41 +00:00
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# beacon_chain
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2021-02-15 16:40:00 +00:00
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# Copyright (c) 2020-2021 Status Research & Development GmbH
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2021-01-18 20:34:41 +00:00
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# Licensed and distributed under either of
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# * MIT license (license terms in the root directory or at https://opensource.org/licenses/MIT).
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# * Apache v2 license (license terms in the root directory or at https://www.apache.org/licenses/LICENSE-2.0).
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# at your option. This file may not be copied, modified, or distributed except according to those terms.
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{.push raises: [Defect].}
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import
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ssz/types,
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spec/[datatypes, digest, helpers]
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func diffModIncEpoch[T, U](hl: HashArray[U, T], startSlot: uint64):
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array[SLOTS_PER_EPOCH, T] =
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static: doAssert U.uint64 mod SLOTS_PER_EPOCH == 0
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doAssert startSlot mod SLOTS_PER_EPOCH == 0
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for i in startSlot ..< startSlot + SLOTS_PER_EPOCH:
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result[i mod SLOTS_PER_EPOCH] = hl[i mod U.uint64]
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func applyModIncrement[T, U](
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ha: var HashArray[U, T], hl: array[SLOTS_PER_EPOCH, T], slot: uint64) =
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var indexSlot = slot
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for item in hl:
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ha[indexSlot mod U.uint64] = item
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indexSlot += 1
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func applyValidatorIdentities(
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validators: var HashList[Validator, Limit VALIDATOR_REGISTRY_LIMIT],
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hl: auto) =
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for item in hl:
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validators.add Validator(
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pubkey: item.pubkey,
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withdrawal_credentials: item.withdrawal_credentials)
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func setValidatorStatuses(
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validators: var HashList[Validator, Limit VALIDATOR_REGISTRY_LIMIT],
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hl: List[ValidatorStatus, Limit VALIDATOR_REGISTRY_LIMIT]) =
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doAssert validators.len == hl.len
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for i in 0 ..< hl.len:
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validators[i].effective_balance = hl[i].effective_balance
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validators[i].slashed = hl[i].slashed
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validators[i].activation_eligibility_epoch =
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hl[i].activation_eligibility_epoch
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validators[i].activation_epoch = hl[i].activation_epoch
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validators[i].exit_epoch = hl[i].exit_epoch
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validators[i].withdrawable_epoch = hl[i].withdrawable_epoch
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func deltaEncodeBalances*[T, U](balances: HashList[T, U]): List[T, U] =
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if balances.len == 0:
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return
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result.add balances[0]
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for i in 1 ..< balances.len:
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result.add balances[i] - balances[i - 1]
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doAssert balances.len == result.len
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func deltaDecodeBalances*[T, U](encodedBalances: List[T, U]): HashList[T, U] =
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var accum = 0'u64
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for i in 0 ..< encodedBalances.len:
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accum += encodedBalances[i]
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result.add accum
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doAssert encodedBalances.len == result.len
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func replaceOrAddEncodeEth1Votes[T, U](votes0, votes1: HashList[T, U]):
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(bool, List[T, U]) =
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let
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num_votes0 = votes0.len
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lower_bound =
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if votes1.len < num_votes0 or
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(num_votes0 > 0 and votes0[num_votes0 - 1] != votes1[num_votes0 - 1]):
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# EPOCHS_PER_ETH1_VOTING_PERIOD epochs have passed, and
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# eth1_data_votes has been reset/cleared. Because their
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# deposit_index counts increase monotonically, it works
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# to use only the last element for comparison.
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0
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else:
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num_votes0
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result[0] = lower_bound == 0
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for i in lower_bound ..< votes1.len:
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result[1].add votes1[i]
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func replaceOrAddDecodeEth1Votes[T, U](
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votes0: var HashList[T, U], eth1_data_votes_replaced: bool,
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votes1: List[T, U]) =
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if eth1_data_votes_replaced:
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votes0 = HashList[T, U]()
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for item in votes1:
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votes0.add item
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2021-02-15 16:40:00 +00:00
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func getMutableValidatorStatus(validator: Validator): ValidatorStatus =
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ValidatorStatus(
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effective_balance: validator.effective_balance,
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slashed: validator.slashed,
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activation_eligibility_epoch: validator.activation_eligibility_epoch,
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activation_epoch: validator.activation_epoch,
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exit_epoch: validator.exit_epoch,
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withdrawable_epoch: validator.withdrawable_epoch)
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func getMutableValidatorStatuses(state: BeaconState):
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List[ValidatorStatus, Limit VALIDATOR_REGISTRY_LIMIT] =
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# use mapIt + .init(foo)?
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for validator in state.validators:
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result.add getMutableValidatorStatus(validator)
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2021-01-18 20:34:41 +00:00
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func diffStates*(state0, state1: BeaconState): BeaconStateDiff =
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doAssert state1.slot > state0.slot
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doAssert state0.slot.isEpoch
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doAssert state1.slot == state0.slot + SLOTS_PER_EPOCH
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# TODO not here, but in chainDag, an isancestorof check
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doAssert state0.genesis_time == state1.genesis_time
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doAssert state0.genesis_validators_root == state1.genesis_validators_root
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doAssert state0.fork == state1.fork
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doAssert state1.historical_roots.len - state0.historical_roots.len in [0, 1]
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let
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historical_root_added =
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state0.historical_roots.len != state1.historical_roots.len
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(eth1_data_votes_replaced, eth1_data_votes) =
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replaceOrAddEncodeEth1Votes(state0.eth1_data_votes, state1.eth1_data_votes)
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BeaconStateDiff(
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slot: state1.slot,
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latest_block_header: state1.latest_block_header,
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block_roots: diffModIncEpoch(state1.block_roots, state0.slot.uint64),
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state_roots: diffModIncEpoch(state1.state_roots, state0.slot.uint64),
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historical_root_added: historical_root_added,
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historical_root:
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if historical_root_added:
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state1.historical_roots[state0.historical_roots.len]
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else:
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default(Eth2Digest),
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eth1_data: state1.eth1_data,
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eth1_data_votes_replaced: eth1_data_votes_replaced,
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eth1_data_votes: eth1_data_votes,
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eth1_deposit_index: state1.eth1_deposit_index,
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2021-02-15 16:40:00 +00:00
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validatorStatuses: getMutableValidatorStatuses(state1),
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2021-01-18 20:34:41 +00:00
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balances: deltaEncodeBalances(state1.balances),
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# RANDAO mixes gets updated every block, in place
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randao_mix: state1.randao_mixes[state0.slot.compute_epoch_at_slot.uint64 mod
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EPOCHS_PER_HISTORICAL_VECTOR.uint64],
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slashing: state1.slashings[state0.slot.compute_epoch_at_slot.uint64 mod
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EPOCHS_PER_HISTORICAL_VECTOR.uint64],
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previous_epoch_attestations: state1.previous_epoch_attestations,
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current_epoch_attestations: state1.current_epoch_attestations,
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justification_bits: state1.justification_bits,
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previous_justified_checkpoint: state1.previous_justified_checkpoint,
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current_justified_checkpoint: state1.current_justified_checkpoint,
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finalized_checkpoint: state1.finalized_checkpoint
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)
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func applyDiff*(
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state: var BeaconState,
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immutableValidators: openArray[ImmutableValidatorData],
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stateDiff: BeaconStateDiff) =
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# Carry over unchanged genesis_time, genesis_validators_root, and fork.
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state.latest_block_header = stateDiff.latest_block_header
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applyModIncrement(state.block_roots, stateDiff.block_roots, state.slot.uint64)
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applyModIncrement(state.state_roots, stateDiff.state_roots, state.slot.uint64)
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if stateDiff.historical_root_added:
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state.historical_roots.add stateDiff.historical_root
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state.eth1_data = stateDiff.eth1_data
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replaceOrAddDecodeEth1Votes(
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state.eth1_data_votes, stateDiff.eth1_data_votes_replaced,
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stateDiff.eth1_data_votes)
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state.eth1_deposit_index = stateDiff.eth1_deposit_index
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applyValidatorIdentities(state.validators, immutableValidators)
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setValidatorStatuses(state.validators, stateDiff.validator_statuses)
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state.balances = deltaDecodeBalances(stateDiff.balances)
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# RANDAO mixes gets updated every block, in place, so ensure there's always
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# >=1 value from it
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let epochIndex =
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state.slot.epoch.uint64 mod EPOCHS_PER_HISTORICAL_VECTOR.uint64
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state.randao_mixes[epochIndex] = stateDiff.randao_mix
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state.slashings[epochIndex] = stateDiff.slashing
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state.previous_epoch_attestations = stateDiff.previous_epoch_attestations
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state.current_epoch_attestations = stateDiff.current_epoch_attestations
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state.justification_bits = stateDiff.justification_bits
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state.previous_justified_checkpoint = stateDiff.previous_justified_checkpoint
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state.current_justified_checkpoint = stateDiff.current_justified_checkpoint
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state.finalized_checkpoint = stateDiff.finalized_checkpoint
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# Don't update slot until the end, because various other updates depend on it
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state.slot = stateDiff.slot
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