mirror of
https://gitlab.com/pulsechaincom/prysm-pulse.git
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cdf50e2fa2
* starting to use SlotToEpoch... * updated exisiting functions... * fixed epoch tests * fixed rest of the tests * tests for newly added helper functions * fixed visiblity * added PrevEpoch and NextEpoch helpers * lint * removed file from other commit
65 lines
2.7 KiB
Go
65 lines
2.7 KiB
Go
// Package attestations tracks the life-cycle of the latest attestations
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// from each validator. It also contains libraries to create attestation
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// message, verify attestation correctness and slashing conditions.
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package attestations
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import (
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"encoding/binary"
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"github.com/prysmaticlabs/prysm/beacon-chain/core/helpers"
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pb "github.com/prysmaticlabs/prysm/proto/beacon/p2p/v1"
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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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// Key generates the blake2b hash of the following attestation fields:
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// slotNumber + shardID + blockHash + obliqueParentHash
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// This is used for attestation table look up in localDB.
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func Key(att *pb.AttestationData) [32]byte {
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key := make([]byte, binary.MaxVarintLen64)
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binary.PutUvarint(key, att.Slot)
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binary.PutUvarint(key, att.Shard)
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key = append(key, att.ShardBlockRootHash32...)
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return hashutil.Hash(key)
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}
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// IsDoubleVote checks if both of the attestations have been used to vote for the same slot.
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// Spec:
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// def is_double_vote(attestation_data_1: AttestationData,
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// attestation_data_2: AttestationData) -> bool
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// """
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// Checks if the two ``AttestationData`` have the same target.
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// """
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// target_epoch_1 = slot_to_epoch(attestation_data_1.slot)
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// target_epoch_2 = slot_to_epoch(attestation_data_2.slot)
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// return target_epoch_1 == target_epoch_2
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func IsDoubleVote(attestation1 *pb.AttestationData, attestation2 *pb.AttestationData) bool {
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targetEpoch1 := helpers.SlotToEpoch(attestation1.Slot)
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targetEpoch2 := helpers.SlotToEpoch(attestation2.Slot)
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return targetEpoch1 == targetEpoch2
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}
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// IsSurroundVote checks if the data provided by the attestations fulfill the conditions for
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// a surround vote.
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// Spec:
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// def is_surround_vote(attestation_data_1: AttestationData,
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// attestation_data_2: AttestationData) -> bool:
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// """
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// Checks if ``attestation_data_1`` surrounds ``attestation_data_2``.
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// """
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// source_epoch_1 = attestation_data_1.justified_epoch
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// source_epoch_2 = attestation_data_2.justified_epoch
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// target_epoch_1 = slot_to_epoch(attestation_data_1.slot)
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// target_epoch_2 = slot_to_epoch(attestation_data_2.slot)
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//
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// return source_epoch_1 < source_epoch_2 and target_epoch_2 < target_epoch_1
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func IsSurroundVote(attestation1 *pb.AttestationData, attestation2 *pb.AttestationData) bool {
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epochLength := params.BeaconConfig().EpochLength
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sourceEpoch1 := attestation1.JustifiedSlot / epochLength
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sourceEpoch2 := attestation2.JustifiedSlot / epochLength
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targetEpoch1 := helpers.SlotToEpoch(attestation1.Slot)
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targetEpoch2 := helpers.SlotToEpoch(attestation2.Slot)
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return sourceEpoch1 < sourceEpoch2 && targetEpoch2 < targetEpoch1
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}
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