56 lines
2.3 KiB
Nim
56 lines
2.3 KiB
Nim
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# beacon_chain
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# Copyright (c) 2018-2020 Status Research & Development GmbH
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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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import
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std/[algorithm, sequtils, sets],
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../spec/[beaconstate, datatypes, presets, validator],
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block_pools_types
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# Spec functions implemented based on cached values instead of the full state
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func count_active_validators*(epochInfo: EpochRef): uint64 =
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epochInfo.shuffled_active_validator_indices.lenu64
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func get_committee_count_per_slot*(epochInfo: EpochRef): uint64 =
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get_committee_count_per_slot(count_active_validators(epochInfo))
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func get_beacon_committee*(
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epochRef: EpochRef, slot: Slot, index: CommitteeIndex): seq[ValidatorIndex] =
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# Return the beacon committee at ``slot`` for ``index``.
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let
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committees_per_slot = get_committee_count_per_slot(epochRef)
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compute_committee(
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epochRef.shuffled_active_validator_indices,
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(slot mod SLOTS_PER_EPOCH) * committees_per_slot +
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index.uint64,
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committees_per_slot * SLOTS_PER_EPOCH
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)
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# https://github.com/ethereum/eth2.0-specs/blob/v0.12.2/specs/phase0/beacon-chain.md#get_attesting_indices
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func get_attesting_indices*(epochRef: EpochRef,
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data: AttestationData,
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bits: CommitteeValidatorsBits):
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HashSet[ValidatorIndex] =
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get_attesting_indices(
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bits,
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get_beacon_committee(epochRef, data.slot, data.index.CommitteeIndex))
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# https://github.com/ethereum/eth2.0-specs/blob/v0.12.2/specs/phase0/beacon-chain.md#get_indexed_attestation
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func get_indexed_attestation*(epochRef: EpochRef, attestation: Attestation): IndexedAttestation =
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# Return the indexed attestation corresponding to ``attestation``.
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let
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attesting_indices =
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get_attesting_indices(
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epochRef, attestation.data, attestation.aggregation_bits)
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IndexedAttestation(
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attesting_indices:
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List[uint64, Limit MAX_VALIDATORS_PER_COMMITTEE].init(
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sorted(mapIt(attesting_indices, it.uint64), system.cmp)),
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data: attestation.data,
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signature: attestation.signature
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)
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