mirror of
https://gitlab.com/pulsechaincom/prysm-pulse.git
synced 2024-12-25 12:57:18 +00:00
291 lines
11 KiB
Go
291 lines
11 KiB
Go
package helpers
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import (
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"github.com/pkg/errors"
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ethpb "github.com/prysmaticlabs/ethereumapis/eth/v1alpha1"
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stateTrie "github.com/prysmaticlabs/prysm/beacon-chain/state"
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pb "github.com/prysmaticlabs/prysm/proto/beacon/p2p/v1"
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"github.com/prysmaticlabs/prysm/shared/bls"
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"github.com/prysmaticlabs/prysm/shared/bytesutil"
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"github.com/prysmaticlabs/prysm/shared/hashutil"
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"github.com/prysmaticlabs/prysm/shared/params"
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)
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// IsActiveValidator returns the boolean value on whether the validator
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// is active or not.
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//
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// Spec pseudocode definition:
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// def is_active_validator(validator: Validator, epoch: Epoch) -> bool:
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// """
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// Check if ``validator`` is active.
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// """
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// return validator.activation_epoch <= epoch < validator.exit_epoch
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func IsActiveValidator(validator *ethpb.Validator, epoch uint64) bool {
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return checkValidatorActiveStatus(validator.ActivationEpoch, validator.ExitEpoch, epoch)
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}
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// IsActiveValidatorUsingTrie checks if a read only validator is active.
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func IsActiveValidatorUsingTrie(validator *stateTrie.ReadOnlyValidator, epoch uint64) bool {
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return checkValidatorActiveStatus(validator.ActivationEpoch(), validator.ExitEpoch(), epoch)
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}
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func checkValidatorActiveStatus(activationEpoch uint64, exitEpoch uint64, epoch uint64) bool {
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return activationEpoch <= epoch && epoch < exitEpoch
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}
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// IsSlashableValidator returns the boolean value on whether the validator
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// is slashable or not.
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//
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// Spec pseudocode definition:
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// def is_slashable_validator(validator: Validator, epoch: Epoch) -> bool:
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// """
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// Check if ``validator`` is slashable.
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// """
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// return (
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// validator.activation_epoch <= epoch < validator.withdrawable_epoch and
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// validator.slashed is False
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// )
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func IsSlashableValidator(validator *ethpb.Validator, epoch uint64) bool {
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active := validator.ActivationEpoch <= epoch
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beforeWithdrawable := epoch < validator.WithdrawableEpoch
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return beforeWithdrawable && active && !validator.Slashed
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}
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// ActiveValidatorIndices filters out active validators based on validator status
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// and returns their indices in a list.
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//
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// WARNING: This method allocates a new copy of the validator index set and is
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// considered to be very memory expensive. Avoid using this unless you really
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// need the active validator indices for some specific reason.
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//
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// Spec pseudocode definition:
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// def get_active_validator_indices(state: BeaconState, epoch: Epoch) -> Sequence[ValidatorIndex]:
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// """
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// Return the sequence of active validator indices at ``epoch``.
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// """
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// return [ValidatorIndex(i) for i, v in enumerate(state.validators) if is_active_validator(v, epoch)]
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func ActiveValidatorIndices(state *stateTrie.BeaconState, epoch uint64) ([]uint64, error) {
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seed, err := Seed(state, epoch, params.BeaconConfig().DomainBeaconAttester)
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if err != nil {
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return nil, errors.Wrap(err, "could not get seed")
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}
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activeIndices, err := committeeCache.ActiveIndices(seed)
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if err != nil {
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return nil, errors.Wrap(err, "could not interface with committee cache")
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}
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if activeIndices != nil {
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return activeIndices, nil
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}
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var indices []uint64
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state.ReadFromEveryValidator(func(idx int, val *stateTrie.ReadOnlyValidator) error {
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if IsActiveValidatorUsingTrie(val, epoch) {
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indices = append(indices, uint64(idx))
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}
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return nil
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})
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if err := UpdateCommitteeCache(state, epoch); err != nil {
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return nil, errors.Wrap(err, "could not update committee cache")
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}
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return indices, nil
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}
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// ActiveValidatorCount returns the number of active validators in the state
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// at the given epoch.
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func ActiveValidatorCount(state *stateTrie.BeaconState, epoch uint64) (uint64, error) {
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count := uint64(0)
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state.ReadFromEveryValidator(func(idx int, val *stateTrie.ReadOnlyValidator) error {
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if IsActiveValidatorUsingTrie(val, epoch) {
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count++
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}
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return nil
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})
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return count, nil
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}
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// DelayedActivationExitEpoch takes in epoch number and returns when
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// the validator is eligible for activation and exit.
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//
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// Spec pseudocode definition:
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// def compute_activation_exit_epoch(epoch: Epoch) -> Epoch:
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// """
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// Return the epoch during which validator activations and exits initiated in ``epoch`` take effect.
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// """
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// return Epoch(epoch + 1 + ACTIVATION_EXIT_DELAY)
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func DelayedActivationExitEpoch(epoch uint64) uint64 {
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return epoch + 1 + params.BeaconConfig().MaxSeedLookahead
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}
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// ValidatorChurnLimit returns the number of validators that are allowed to
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// enter and exit validator pool for an epoch.
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//
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// Spec pseudocode definition:
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// def get_validator_churn_limit(state: BeaconState) -> uint64:
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// """
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// Return the validator churn limit for the current epoch.
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// """
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// active_validator_indices = get_active_validator_indices(state, get_current_epoch(state))
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// return max(MIN_PER_EPOCH_CHURN_LIMIT, len(active_validator_indices) // CHURN_LIMIT_QUOTIENT)
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func ValidatorChurnLimit(activeValidatorCount uint64) (uint64, error) {
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churnLimit := activeValidatorCount / params.BeaconConfig().ChurnLimitQuotient
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if churnLimit < params.BeaconConfig().MinPerEpochChurnLimit {
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churnLimit = params.BeaconConfig().MinPerEpochChurnLimit
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}
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return churnLimit, nil
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}
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// BeaconProposerIndex returns proposer index of a current slot.
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//
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// Spec pseudocode definition:
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// def get_beacon_proposer_index(state: BeaconState) -> ValidatorIndex:
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// """
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// Return the beacon proposer index at the current slot.
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// """
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// epoch = get_current_epoch(state)
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// seed = hash(get_seed(state, epoch, DOMAIN_BEACON_PROPOSER) + int_to_bytes(state.slot, length=8))
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// indices = get_active_validator_indices(state, epoch)
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// return compute_proposer_index(state, indices, seed)
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func BeaconProposerIndex(state *stateTrie.BeaconState) (uint64, error) {
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e := CurrentEpoch(state)
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seed, err := Seed(state, e, params.BeaconConfig().DomainBeaconAttester)
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if err != nil {
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return 0, errors.Wrap(err, "could not generate seed")
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}
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proposerIndices, err := committeeCache.ProposerIndices(seed)
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if err != nil {
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return 0, errors.Wrap(err, "could not interface with committee cache")
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}
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if proposerIndices != nil {
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return proposerIndices[state.Slot()%params.BeaconConfig().SlotsPerEpoch], nil
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}
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seed, err = Seed(state, e, params.BeaconConfig().DomainBeaconProposer)
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if err != nil {
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return 0, errors.Wrap(err, "could not generate seed")
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}
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seedWithSlot := append(seed[:], bytesutil.Bytes8(state.Slot())...)
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seedWithSlotHash := hashutil.Hash(seedWithSlot)
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indices, err := ActiveValidatorIndices(state, e)
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if err != nil {
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return 0, errors.Wrap(err, "could not get active indices")
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}
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if err := UpdateProposerIndicesInCache(state, CurrentEpoch(state)); err != nil {
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return 0, errors.Wrap(err, "could not update committee cache")
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}
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return ComputeProposerIndex(state.Validators(), indices, seedWithSlotHash)
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}
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// ComputeProposerIndex returns the index sampled by effective balance, which is used to calculate proposer.
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//
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// Note: This method signature deviates slightly from the spec recommended definition. The full
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// state object is not required to compute the proposer index.
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//
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// Spec pseudocode definition:
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// def compute_proposer_index(state: BeaconState, indices: Sequence[ValidatorIndex], seed: Hash) -> ValidatorIndex:
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// """
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// Return from ``indices`` a random index sampled by effective balance.
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// """
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// assert len(indices) > 0
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// MAX_RANDOM_BYTE = 2**8 - 1
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// i = 0
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// while True:
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// candidate_index = indices[compute_shuffled_index(ValidatorIndex(i % len(indices)), len(indices), seed)]
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// random_byte = hash(seed + int_to_bytes(i // 32, length=8))[i % 32]
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// effective_balance = state.validators[candidate_index].effective_balance
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// if effective_balance * MAX_RANDOM_BYTE >= MAX_EFFECTIVE_BALANCE * random_byte:
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// return ValidatorIndex(candidate_index)
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// i += 1
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func ComputeProposerIndex(validators []*ethpb.Validator, activeIndices []uint64, seed [32]byte) (uint64, error) {
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length := uint64(len(activeIndices))
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if length == 0 {
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return 0, errors.New("empty active indices list")
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}
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maxRandomByte := uint64(1<<8 - 1)
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hashFunc := hashutil.CustomSHA256Hasher()
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for i := uint64(0); ; i++ {
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candidateIndex, err := ComputeShuffledIndex(i%length, length, seed, true /* shuffle */)
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if err != nil {
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return 0, err
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}
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candidateIndex = activeIndices[candidateIndex]
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if int(candidateIndex) >= len(validators) {
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return 0, errors.New("active index out of range")
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}
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b := append(seed[:], bytesutil.Bytes8(i/32)...)
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randomByte := hashFunc(b)[i%32]
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v := validators[candidateIndex]
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var effectiveBal uint64
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if v != nil {
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effectiveBal = v.EffectiveBalance
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}
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if effectiveBal*maxRandomByte >= params.BeaconConfig().MaxEffectiveBalance*uint64(randomByte) {
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return candidateIndex, nil
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}
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}
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}
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// Domain returns the domain version for BLS private key to sign and verify.
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//
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// Spec pseudocode definition:
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// def get_domain(state: BeaconState,
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// domain_type: int,
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// message_epoch: Epoch=None) -> int:
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// """
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// Return the signature domain (fork version concatenated with domain type) of a message.
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// """
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// epoch = get_current_epoch(state) if message_epoch is None else message_epoch
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// fork_version = state.fork.previous_version if epoch < state.fork.epoch else state.fork.current_version
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// return bls_domain(domain_type, fork_version)
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func Domain(fork *pb.Fork, epoch uint64, domainType []byte) uint64 {
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var forkVersion []byte
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if epoch < fork.Epoch {
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forkVersion = fork.PreviousVersion
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} else {
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forkVersion = fork.CurrentVersion
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}
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return bls.Domain(domainType, forkVersion)
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}
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// IsEligibleForActivationQueue checks if the validator is eligible to
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// be places into the activation queue.
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//
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// Spec pseudocode definition:
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// def is_eligible_for_activation_queue(validator: Validator) -> bool:
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// """
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// Check if ``validator`` is eligible to be placed into the activation queue.
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// """
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// return (
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// validator.activation_eligibility_epoch == FAR_FUTURE_EPOCH
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// and validator.effective_balance == MAX_EFFECTIVE_BALANCE
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// )
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func IsEligibleForActivationQueue(validator *ethpb.Validator) bool {
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return validator.ActivationEligibilityEpoch == params.BeaconConfig().FarFutureEpoch &&
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validator.EffectiveBalance == params.BeaconConfig().MaxEffectiveBalance
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}
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// IsEligibleForActivation checks if the validator is eligible for activation.
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//
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// Spec pseudocode definition:
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// def is_eligible_for_activation(state: BeaconState, validator: Validator) -> bool:
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// """
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// Check if ``validator`` is eligible for activation.
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// """
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// return (
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// # Placement in queue is finalized
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// validator.activation_eligibility_epoch <= state.finalized_checkpoint.epoch
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// # Has not yet been activated
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// and validator.activation_epoch == FAR_FUTURE_EPOCH
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// )
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func IsEligibleForActivation(state *stateTrie.BeaconState, validator *ethpb.Validator) bool {
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finalizedEpoch := state.FinalizedCheckpointEpoch()
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return validator.ActivationEligibilityEpoch <= finalizedEpoch &&
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validator.ActivationEpoch == params.BeaconConfig().FarFutureEpoch
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}
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