nimbus-eth2/beacon_chain/spec/state_transition_helpers.nim

43 lines
1.8 KiB
Nim

# beacon_chain
# Copyright (c) 2018-2019 Status Research & Development GmbH
# Licensed and distributed under either of
# * MIT license (license terms in the root directory or at https://opensource.org/licenses/MIT).
# * Apache v2 license (license terms in the root directory or at https://www.apache.org/licenses/LICENSE-2.0).
# at your option. This file may not be copied, modified, or distributed except according to those terms.
import
# Standard library
sets,
# Internals
./datatypes, ./digest, ./beaconstate
# Logging utilities
# --------------------------------------------------------
# TODO: gather all logging utilities
# from crypto, digest, etc in a single file
func shortLog*(x: Checkpoint): string =
"(epoch: " & $x.epoch & ", root: \"" & shortLog(x.root) & "\")"
# Helpers used in epoch transition and trace-level block transition
# --------------------------------------------------------
# https://github.com/ethereum/eth2.0-specs/blob/v0.9.2/specs/core/0_beacon-chain.md#helper-functions-1
func get_attesting_indices*(
state: BeaconState, attestations: openarray[PendingAttestation],
stateCache: var StateCache): HashSet[ValidatorIndex] =
# This is part of get_unslashed_attesting_indices(...) in spec.
result = initHashSet[ValidatorIndex]()
for a in attestations:
result = result.union(get_attesting_indices(
state, a.data, a.aggregation_bits, stateCache))
# https://github.com/ethereum/eth2.0-specs/blob/v0.9.4/specs/core/0_beacon-chain.md#helper-functions-1
func get_unslashed_attesting_indices*(
state: BeaconState, attestations: openarray[PendingAttestation],
stateCache: var StateCache): HashSet[ValidatorIndex] =
result = get_attesting_indices(state, attestations, stateCache)
for index in result:
if state.validators[index].slashed:
result.excl index